Merge branch 'develop'

CHANGELOG.md

@@ -3,6 +3,18 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [v1.3.0] - 2020-12-26
+### Added
+- Viewer: quick scale (aka one finger zoom)
+- Viewer: optional checkered background for transparent images
+
+### Changed
+- Viewer: changed panning inertia
+
+### Fixed
+- Viewer: fixed scaling focus when zooming by double-tap or pinch
+- Viewer: fixed panning during scaling
+
 ## [v1.2.9] - 2020-12-12
 ### Added
 - Collection: identify 360 photos/videos, GeoTIFF

README.md

@@ -26,7 +26,6 @@ Aves is a gallery and metadata explorer app. It is built for Android, with Flutt
 
 ## Known Issues
 
-- gesture: double tap on image does not zoom on tapped area (cf [photo_view issue #82](https://github.com/renancaraujo/photo_view/issues/82))
 - performance: image info page stutters the first time it loads a Google Maps view (cf [flutter issue #28493](https://github.com/flutter/flutter/issues/28493))
 - SVG: unsupported `currentColor` (cf [flutter_svg issue #31](https://github.com/dnfield/flutter_svg/issues/31))
 - SVG: unsupported out of order defs/references (cf [flutter_svg issue #102](https://github.com/dnfield/flutter_svg/issues/102))

android/app/build.gradle

@@ -53,7 +53,7 @@ android {
 
     defaultConfig {
         applicationId "deckers.thibault.aves"
-        // TODO TLAD try minSdkVersion 23 when kotlin migration is done
+        // TODO TLAD try minSdkVersion 23
         minSdkVersion 24
         targetSdkVersion 30 // same as compileSdkVersion
         versionCode flutterVersionCode.toInteger()
@@ -99,7 +99,7 @@ repositories {
 dependencies {
     implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9'
     implementation 'androidx.core:core-ktx:1.5.0-alpha05' // v1.5.0-alpha02+ for ShortcutManagerCompat.setDynamicShortcuts
-    implementation 'androidx.exifinterface:exifinterface:1.3.1'
+    implementation 'androidx.exifinterface:exifinterface:1.3.2'
     implementation 'com.commonsware.cwac:document:0.4.1'
     implementation 'com.drewnoakes:metadata-extractor:2.15.0'
     // as of v0.9.8.7, `Android-TiffBitmapFactory` master branch is set up to release and distribute via Bintray

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/AppAdapterHandler.kt

@@ -17,6 +17,7 @@ import deckers.thibault.aves.utils.LogUtils.createTag
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import java.io.File
@@ -27,8 +28,8 @@ import kotlin.math.roundToInt
 class AppAdapterHandler(private val context: Context) : MethodCallHandler {
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getAppIcon" -> GlobalScope.launch { getAppIcon(call, Coresult(result)) }
+            "getAppIcon" -> GlobalScope.launch(Dispatchers.IO) { getAppIcon(call, Coresult(result)) }
-            "getAppNames" -> GlobalScope.launch { getAppNames(Coresult(result)) }
+            "getAppNames" -> GlobalScope.launch(Dispatchers.IO) { getAppNames(Coresult(result)) }
             "edit" -> {
                 val title = call.argument<String>("title")
                 val uri = call.argument<String>("uri")?.let { Uri.parse(it) }

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/AppShortcutHandler.kt

@@ -12,6 +12,7 @@ import deckers.thibault.aves.utils.BitmapUtils.centerSquareCrop
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 
@@ -20,7 +21,7 @@ class AppShortcutHandler(private val context: Context) : MethodCallHandler {
         when (call.method) {
             "canPin" -> result.success(canPin())
             "pin" -> {
-                GlobalScope.launch { pin(call) }
+                GlobalScope.launch(Dispatchers.IO) { pin(call) }
                 result.success(null)
             }
             else -> result.notImplemented()

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/DebugHandler.kt

@@ -25,6 +25,7 @@ import deckers.thibault.aves.utils.StorageUtils
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import org.beyka.tiffbitmapfactory.TiffBitmapFactory
@@ -36,12 +37,12 @@ class DebugHandler(private val context: Context) : MethodCallHandler {
         when (call.method) {
             "getContextDirs" -> result.success(getContextDirs())
             "getEnv" -> result.success(System.getenv())
-            "getBitmapFactoryInfo" -> GlobalScope.launch { getBitmapFactoryInfo(call, Coresult(result)) }
+            "getBitmapFactoryInfo" -> GlobalScope.launch(Dispatchers.IO) { getBitmapFactoryInfo(call, Coresult(result)) }
-            "getContentResolverMetadata" -> GlobalScope.launch { getContentResolverMetadata(call, Coresult(result)) }
+            "getContentResolverMetadata" -> GlobalScope.launch(Dispatchers.IO) { getContentResolverMetadata(call, Coresult(result)) }
-            "getExifInterfaceMetadata" -> GlobalScope.launch { getExifInterfaceMetadata(call, Coresult(result)) }
+            "getExifInterfaceMetadata" -> GlobalScope.launch(Dispatchers.IO) { getExifInterfaceMetadata(call, Coresult(result)) }
-            "getMediaMetadataRetrieverMetadata" -> GlobalScope.launch { getMediaMetadataRetrieverMetadata(call, Coresult(result)) }
+            "getMediaMetadataRetrieverMetadata" -> GlobalScope.launch(Dispatchers.IO) { getMediaMetadataRetrieverMetadata(call, Coresult(result)) }
-            "getMetadataExtractorSummary" -> GlobalScope.launch { getMetadataExtractorSummary(call, Coresult(result)) }
+            "getMetadataExtractorSummary" -> GlobalScope.launch(Dispatchers.IO) { getMetadataExtractorSummary(call, Coresult(result)) }
-            "getTiffStructure" -> GlobalScope.launch { getTiffStructure(call, Coresult(result)) }
+            "getTiffStructure" -> GlobalScope.launch(Dispatchers.IO) { getTiffStructure(call, Coresult(result)) }
             else -> result.notImplemented()
         }
     }

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/ImageFileHandler.kt

@@ -26,12 +26,12 @@ class ImageFileHandler(private val activity: Activity) : MethodCallHandler {
 
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getObsoleteEntries" -> GlobalScope.launch { getObsoleteEntries(call, Coresult(result)) }
+            "getObsoleteEntries" -> GlobalScope.launch(Dispatchers.IO) { getObsoleteEntries(call, Coresult(result)) }
-            "getImageEntry" -> GlobalScope.launch { getImageEntry(call, Coresult(result)) }
+            "getImageEntry" -> GlobalScope.launch(Dispatchers.IO) { getImageEntry(call, Coresult(result)) }
-            "getThumbnail" -> GlobalScope.launch { getThumbnail(call, Coresult(result)) }
+            "getThumbnail" -> GlobalScope.launch(Dispatchers.IO) { getThumbnail(call, Coresult(result)) }
-            "getRegion" -> GlobalScope.launch { getRegion(call, Coresult(result)) }
+            "getRegion" -> GlobalScope.launch(Dispatchers.IO) { getRegion(call, Coresult(result)) }
             "clearSizedThumbnailDiskCache" -> {
-                GlobalScope.launch { Glide.get(activity).clearDiskCache() }
+                GlobalScope.launch(Dispatchers.IO) { Glide.get(activity).clearDiskCache() }
                 result.success(null)
             }
             "rename" -> GlobalScope.launch(Dispatchers.IO) { rename(call, Coresult(result)) }

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/MetadataHandler.kt

@@ -61,6 +61,7 @@ import deckers.thibault.aves.utils.StorageUtils
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import java.io.File
@@ -70,12 +71,12 @@ import kotlin.math.roundToLong
 class MetadataHandler(private val context: Context) : MethodCallHandler {
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getAllMetadata" -> GlobalScope.launch { getAllMetadata(call, Coresult(result)) }
+            "getAllMetadata" -> GlobalScope.launch(Dispatchers.IO) { getAllMetadata(call, Coresult(result)) }
-            "getCatalogMetadata" -> GlobalScope.launch { getCatalogMetadata(call, Coresult(result)) }
+            "getCatalogMetadata" -> GlobalScope.launch(Dispatchers.IO) { getCatalogMetadata(call, Coresult(result)) }
-            "getOverlayMetadata" -> GlobalScope.launch { getOverlayMetadata(call, Coresult(result)) }
+            "getOverlayMetadata" -> GlobalScope.launch(Dispatchers.IO) { getOverlayMetadata(call, Coresult(result)) }
-            "getEmbeddedPictures" -> GlobalScope.launch { getEmbeddedPictures(call, Coresult(result)) }
+            "getEmbeddedPictures" -> GlobalScope.launch(Dispatchers.IO) { getEmbeddedPictures(call, Coresult(result)) }
-            "getExifThumbnails" -> GlobalScope.launch { getExifThumbnails(call, Coresult(result)) }
+            "getExifThumbnails" -> GlobalScope.launch(Dispatchers.IO) { getExifThumbnails(call, Coresult(result)) }
-            "extractXmpDataProp" -> GlobalScope.launch { extractXmpDataProp(call, Coresult(result)) }
+            "extractXmpDataProp" -> GlobalScope.launch(Dispatchers.IO) { extractXmpDataProp(call, Coresult(result)) }
             else -> result.notImplemented()
         }
     }
@@ -588,7 +589,7 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
                             "mimeType" to embedMimeType,
                         )
                         if (isImage(embedMimeType) || isVideo(embedMimeType)) {
-                            GlobalScope.launch {
+                            GlobalScope.launch(Dispatchers.IO) {
                                 FileImageProvider().fetchSingle(context, embedUri, embedMimeType, object : ImageProvider.ImageOpCallback {
                                     override fun onSuccess(fields: FieldMap) {
                                         embedFields.putAll(fields)

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/StorageHandler.kt

@@ -11,6 +11,7 @@ import deckers.thibault.aves.utils.StorageUtils.getVolumePaths
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import java.io.File
@@ -32,7 +33,7 @@ class StorageHandler(private val context: Context) : MethodCallHandler {
             "getGrantedDirectories" -> result.success(ArrayList(PermissionManager.getGrantedDirs(context)))
             "getInaccessibleDirectories" -> getInaccessibleDirectories(call, result)
             "revokeDirectoryAccess" -> revokeDirectoryAccess(call, result)
-            "scanFile" -> GlobalScope.launch { scanFile(call, Coresult(result)) }
+            "scanFile" -> GlobalScope.launch(Dispatchers.IO) { scanFile(call, Coresult(result)) }
             else -> result.notImplemented()
         }
     }

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/ImageByteStreamHandler.kt

@@ -18,6 +18,7 @@ import deckers.thibault.aves.utils.MimeTypes.needRotationAfterGlide
 import deckers.thibault.aves.utils.StorageUtils
 import io.flutter.plugin.common.EventChannel
 import io.flutter.plugin.common.EventChannel.EventSink
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import org.beyka.tiffbitmapfactory.TiffBitmapFactory
@@ -32,7 +33,7 @@ class ImageByteStreamHandler(private val activity: Activity, private val argumen
         this.eventSink = eventSink
         handler = Handler(Looper.getMainLooper())
 
-        GlobalScope.launch { streamImage() }
+        GlobalScope.launch(Dispatchers.IO) { streamImage() }
     }
 
     override fun onCancel(o: Any) {}

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/MediaStoreStreamHandler.kt

@@ -7,6 +7,7 @@ import deckers.thibault.aves.model.provider.FieldMap
 import deckers.thibault.aves.model.provider.MediaStoreImageProvider
 import io.flutter.plugin.common.EventChannel
 import io.flutter.plugin.common.EventChannel.EventSink
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 
@@ -27,7 +28,7 @@ class MediaStoreStreamHandler(private val context: Context, arguments: Any?) : E
         this.eventSink = eventSink
         handler = Handler(Looper.getMainLooper())
 
-        GlobalScope.launch { fetchAll() }
+        GlobalScope.launch(Dispatchers.IO) { fetchAll() }
     }
 
     override fun onCancel(arguments: Any?) {}

android/build.gradle

@@ -1,6 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = '1.4.20'
+    ext.kotlin_version = '1.4.21'
     repositories {
         google()
         jcenter()

lib/image_providers/region_provider.dart

@@ -125,7 +125,5 @@ class RegionProviderKey {
       );
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, sampleSize=$sampleSize, regionRect=$regionRect, imageSize=$imageSize, scale=$scale}';
-    return 'RegionProviderKey(uri=$uri, mimeType=$mimeType, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, sampleSize=$sampleSize, regionRect=$regionRect, imageSize=$imageSize, scale=$scale)';
-  }
 }

lib/image_providers/thumbnail_provider.dart

@@ -116,7 +116,5 @@ class ThumbnailProviderKey {
       );
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, dateModifiedSecs=$dateModifiedSecs, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, extent=$extent, scale=$scale}';
-    return 'ThumbnailProviderKey{uri=$uri, mimeType=$mimeType, dateModifiedSecs=$dateModifiedSecs, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, extent=$extent, scale=$scale}';
-  }
 }

lib/image_providers/uri_image_provider.dart

@@ -80,5 +80,5 @@ class UriImage extends ImageProvider<UriImage> {
   int get hashCode => hashValues(uri, scale);
 
   @override
-  String toString() => '${objectRuntimeType(this, 'UriImage')}(uri=$uri, mimeType=$mimeType, scale=$scale)';
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, scale=$scale}';
 }

lib/image_providers/uri_picture_provider.dart

@@ -54,5 +54,5 @@ class UriPicture extends PictureProvider<UriPicture> {
   int get hashCode => hashValues(uri, colorFilter);
 
   @override
-  String toString() => '${objectRuntimeType(this, 'UriPicture')}(uri=$uri, mimeType=$mimeType, colorFilter=$colorFilter)';
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, colorFilter=$colorFilter}';
 }

lib/model/filters/album.dart

@@ -87,7 +87,5 @@ class AlbumFilter extends CollectionFilter {
   int get hashCode => hashValues(type, album);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{album=$album}';
-    return '$runtimeType#${shortHash(this)}{album=$album}';
-  }
 }

lib/model/filters/location.dart

@@ -62,9 +62,7 @@ class LocationFilter extends CollectionFilter {
   int get hashCode => hashValues(type, level, _location);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{level=$level, location=$_location}';
-    return '$runtimeType#${shortHash(this)}{level=$level, location=$_location}';
-  }
 
   // U+0041 Latin Capital letter A
   // U+1F1E6 🇦 REGIONAL INDICATOR SYMBOL LETTER A

lib/model/filters/mime.dart

@@ -88,7 +88,5 @@ class MimeFilter extends CollectionFilter {
   int get hashCode => hashValues(type, mime);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{mime=$mime}';
-    return '$runtimeType#${shortHash(this)}{mime=$mime}';
-  }
 }

lib/model/filters/query.dart

@@ -71,7 +71,5 @@ class QueryFilter extends CollectionFilter {
   int get hashCode => hashValues(type, query);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{query=$query}';
-    return '$runtimeType#${shortHash(this)}{query=$query}';
-  }
 }

lib/model/filters/tag.dart

@@ -48,7 +48,5 @@ class TagFilter extends CollectionFilter {
   int get hashCode => hashValues(type, tag);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{tag=$tag}';
-    return '$runtimeType#${shortHash(this)}{tag=$tag}';
-  }
 }

lib/model/image_entry.dart

@@ -7,6 +7,7 @@ import 'package:aves/model/metadata_db.dart';
 import 'package:aves/services/image_file_service.dart';
 import 'package:aves/services/metadata_service.dart';
 import 'package:aves/services/service_policy.dart';
+import 'package:aves/services/svg_metadata_service.dart';
 import 'package:aves/utils/change_notifier.dart';
 import 'package:aves/utils/math_utils.dart';
 import 'package:aves/utils/time_utils.dart';
@@ -24,8 +25,6 @@ class ImageEntry {
   String _path, _directory, _filename, _extension;
   int contentId;
   final String sourceMimeType;
-
-  // TODO TLAD use SVG viewport as width/height
   int width;
   int height;
   int sourceRotationDegrees;
@@ -64,6 +63,8 @@ class ImageEntry {
 
   bool get canDecode => !undecodable.contains(mimeType);
 
+  bool get canHaveAlpha => MimeTypes.alphaImages.contains(mimeType);
+
   ImageEntry copyWith({
     @required String uri,
     @required String path,
@@ -134,9 +135,7 @@ class ImageEntry {
   }
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, path=$path}';
-    return 'ImageEntry{uri=$uri, path=$path}';
-  }
 
   set path(String path) {
     _path = path;
@@ -238,10 +237,24 @@ class ImageEntry {
   // but it would take space and time, so a basic workaround will do.
   bool get isPortrait => rotationDegrees % 180 == 90 && (catalogMetadata?.rotationDegrees == null || width > height);
 
+  static const ratioSeparator = '\u2236';
+  static const resolutionSeparator = ' \u00D7 ';
+
   String get resolutionText {
     final w = width ?? '?';
     final h = height ?? '?';
-    return isPortrait ? '$h × $w' : '$w × $h';
+    return isPortrait ? '$h$resolutionSeparator$w' : '$w$resolutionSeparator$h';
+  }
+
+  String get aspectRatioText {
+    if (width != null && height != null && width > 0 && height > 0) {
+      final gcd = width.gcd(height);
+      final w = width ~/ gcd;
+      final h = height ~/ gcd;
+      return isPortrait ? '$h$ratioSeparator$w' : '$w$ratioSeparator$h';
+    } else {
+      return '?$ratioSeparator?';
+    }
   }
 
   double get displayAspectRatio {
@@ -321,7 +334,7 @@ class ImageEntry {
   String _bestTitle;
 
   String get bestTitle {
-    _bestTitle ??= (isCatalogued && _catalogMetadata.xmpTitleDescription.isNotEmpty) ? _catalogMetadata.xmpTitleDescription : sourceTitle;
+    _bestTitle ??= (isCatalogued && _catalogMetadata.xmpTitleDescription?.isNotEmpty == true) ? _catalogMetadata.xmpTitleDescription : sourceTitle;
     return _bestTitle;
   }
 
@@ -352,8 +365,21 @@ class ImageEntry {
 
   Future<void> catalog({bool background = false}) async {
     if (isCatalogued) return;
+    if (isSvg) {
+      // vector image sizing is not essential, so we should not spend time for it during loading
+      // but it is useful anyway (for aspect ratios etc.) so we size them during cataloguing
+      final size = await SvgMetadataService.getSize(this);
+      if (size != null) {
+        await _applyNewFields({
+          'width': size.width.round(),
+          'height': size.height.round(),
+        });
+      }
+      catalogMetadata = CatalogMetadata(contentId: contentId);
+    } else {
       catalogMetadata = await MetadataService.getCatalogMetadata(this, background: background);
     }
+  }
 
   AddressDetails get addressDetails => _addressDetails;
 
@@ -449,6 +475,12 @@ class ImageEntry {
       this.sourceTitle = sourceTitle;
       _bestTitle = null;
     }
+
+    final width = newFields['width'];
+    if (width is int) this.width = width;
+    final height = newFields['height'];
+    if (height is int) this.height = height;
+
     final dateModifiedSecs = newFields['dateModifiedSecs'];
     if (dateModifiedSecs is int) this.dateModifiedSecs = dateModifiedSecs;
     final rotationDegrees = newFields['rotationDegrees'];

lib/model/image_metadata.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 import 'package:geocoder/model.dart';
 import 'package:intl/intl.dart';
@@ -23,9 +24,7 @@ class DateMetadata {
       };
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{contentId=$contentId, dateMillis=$dateMillis}';
-    return 'DateMetadata{contentId=$contentId, dateMillis=$dateMillis}';
-  }
 }
 
 class CatalogMetadata {
@@ -47,10 +46,10 @@ class CatalogMetadata {
     this.contentId,
     this.mimeType,
     this.dateMillis,
-    this.isAnimated,
+    this.isAnimated = false,
-    this.isFlipped,
+    this.isFlipped = false,
-    this.isGeotiff,
+    this.isGeotiff = false,
-    this.is360,
+    this.is360 = false,
     this.rotationDegrees,
     this.xmpSubjects,
     this.xmpTitleDescription,
@@ -117,9 +116,7 @@ class CatalogMetadata {
       };
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{contentId=$contentId, mimeType=$mimeType, dateMillis=$dateMillis, isAnimated=$isAnimated, isFlipped=$isFlipped, isGeotiff=$isGeotiff, is360=$is360, rotationDegrees=$rotationDegrees, latitude=$latitude, longitude=$longitude, xmpSubjects=$xmpSubjects, xmpTitleDescription=$xmpTitleDescription}';
-    return 'CatalogMetadata{contentId=$contentId, mimeType=$mimeType, dateMillis=$dateMillis, isAnimated=$isAnimated, isFlipped=$isFlipped, isGeotiff=$isGeotiff, is360=$is360, rotationDegrees=$rotationDegrees, latitude=$latitude, longitude=$longitude, xmpSubjects=$xmpSubjects, xmpTitleDescription=$xmpTitleDescription}';
-  }
 }
 
 class OverlayMetadata {
@@ -150,9 +147,7 @@ class OverlayMetadata {
   bool get isEmpty => aperture == null && exposureTime == null && focalLength == null && iso == null;
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{aperture=$aperture, exposureTime=$exposureTime, focalLength=$focalLength, iso=$iso}';
-    return 'OverlayMetadata{aperture=$aperture, exposureTime=$exposureTime, focalLength=$focalLength, iso=$iso}';
-  }
 }
 
 class AddressDetails {
@@ -200,9 +195,7 @@ class AddressDetails {
       };
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{contentId=$contentId, countryCode=$countryCode, countryName=$countryName, adminArea=$adminArea, locality=$locality}';
-    return 'AddressDetails{contentId=$contentId, countryCode=$countryCode, countryName=$countryName, adminArea=$adminArea, locality=$locality}';
-  }
 }
 
 @immutable
@@ -237,7 +230,5 @@ class FavouriteRow {
   int get hashCode => hashValues(contentId, path);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{contentId=$contentId, path=$path}';
-    return 'FavouriteRow{contentId=$contentId, path=$path}';
-  }
 }

lib/model/settings/entry_background.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+
+enum EntryBackground { black, white, transparent, checkered }
+
+extension ExtraEntryBackground on EntryBackground {
+  bool get isColor {
+    switch (this) {
+      case EntryBackground.black:
+      case EntryBackground.white:
+        return true;
+      default:
+        return false;
+    }
+  }
+
+  Color get color {
+    switch (this) {
+      case EntryBackground.black:
+        return Colors.black;
+      case EntryBackground.white:
+        return Colors.white;
+      default:
+        return null;
+    }
+  }
+}

lib/model/settings/settings.dart

@@ -1,5 +1,6 @@
 import 'package:aves/model/filters/filters.dart';
 import 'package:aves/model/settings/coordinate_format.dart';
+import 'package:aves/model/settings/entry_background.dart';
 import 'package:aves/model/settings/home_page.dart';
 import 'package:aves/model/settings/screen_on.dart';
 import 'package:aves/widgets/fullscreen/info/location_section.dart';
@@ -54,7 +55,8 @@ class Settings extends ChangeNotifier {
   static const coordinateFormatKey = 'coordinates_format';
 
   // rendering
-  static const svgBackgroundKey = 'svg_background';
+  static const rasterBackgroundKey = 'raster_background';
+  static const vectorBackgroundKey = 'vector_background';
 
   // search
   static const saveSearchHistoryKey = 'save_search_history';
@@ -184,9 +186,13 @@ class Settings extends ChangeNotifier {
 
   // rendering
 
-  int get svgBackground => _prefs.getInt(svgBackgroundKey) ?? 0xFFFFFFFF;
+  EntryBackground get rasterBackground => getEnumOrDefault(rasterBackgroundKey, EntryBackground.transparent, EntryBackground.values);
 
-  set svgBackground(int newValue) => setAndNotify(svgBackgroundKey, newValue);
+  set rasterBackground(EntryBackground newValue) => setAndNotify(rasterBackgroundKey, newValue.toString());
+
+  EntryBackground get vectorBackground => getEnumOrDefault(vectorBackgroundKey, EntryBackground.white, EntryBackground.values);
+
+  set vectorBackground(EntryBackground newValue) => setAndNotify(vectorBackgroundKey, newValue.toString());
 
   // search
 

lib/model/source/tag.dart

@@ -23,7 +23,7 @@ mixin TagMixin on SourceBase {
 
   Future<void> catalogEntries() async {
 //    final stopwatch = Stopwatch()..start();
-    final todo = rawEntries.where((entry) => !entry.isCatalogued && !entry.isSvg).toList();
+    final todo = rawEntries.where((entry) => !entry.isCatalogued).toList();
     if (todo.isEmpty) return;
 
     var progressDone = 0;

lib/ref/mime_types.dart

@@ -1,15 +1,17 @@
 class MimeTypes {
   static const anyImage = 'image/*';
 
+  static const bmp = 'image/bmp';
   static const gif = 'image/gif';
   static const heic = 'image/heic';
   static const heif = 'image/heif';
+  static const ico = 'image/x-icon';
   static const jpeg = 'image/jpeg';
   static const png = 'image/png';
   static const svg = 'image/svg+xml';
+  static const tiff = 'image/tiff';
   static const webp = 'image/webp';
 
-  static const tiff = 'image/tiff';
   static const psd = 'image/vnd.adobe.photoshop';
 
   static const arw = 'image/x-sony-arw';
@@ -40,6 +42,10 @@ class MimeTypes {
   static const mp4 = 'video/mp4';
 
   // groups
+
+  // formats that support transparency
+  static const List<String> alphaImages = [bmp, gif, ico, png, svg, tiff, webp];
+
   static const List<String> rawImages = [arw, cr2, crw, dcr, dng, erf, k25, kdc, mrw, nef, nrw, orf, pef, raf, raw, rw2, sr2, srf, srw, x3f];
 
   static bool isImage(String mimeType) => mimeType.startsWith('image');

lib/ref/xmp.dart

@@ -15,6 +15,7 @@ class XMP {
     'exifEX': 'Exif Ex',
     'GettyImagesGIFT': 'Getty Images',
     'GIMP': 'GIMP',
+    'GCamera': 'Google Camera',
     'GFocus': 'Google Focus',
     'GPano': 'Google Panorama',
     'illustrator': 'Illustrator',

lib/services/image_file_service.dart

@@ -300,9 +300,7 @@ class ImageOpEvent {
   int get hashCode => hashValues(success, uri);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri}';
-    return 'ImageOpEvent{success=$success, uri=$uri}';
-  }
 }
 
 class MoveOpEvent extends ImageOpEvent {
@@ -323,9 +321,7 @@ class MoveOpEvent extends ImageOpEvent {
   }
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri, newFields=$newFields}';
-    return 'MoveOpEvent{success=$success, uri=$uri, newFields=$newFields}';
-  }
 }
 
 // cf flutter/foundation `consolidateHttpClientResponseBytes`

lib/services/service_policy.dart

@@ -10,7 +10,10 @@ class ServicePolicy {
   final StreamController<QueueState> _queueStreamController = StreamController<QueueState>.broadcast();
   final Map<Object, Tuple2<int, _Task>> _paused = {};
   final SplayTreeMap<int, Queue<_Task>> _queues = SplayTreeMap();
-  _Task _running;
+  final Queue<_Task> _runningQueue = Queue();
+
+  // magic number
+  static const concurrentTaskMax = 4;
 
   Stream<QueueState> get queueStream => _queueStreamController.stream;
 
@@ -23,6 +26,7 @@ class ServicePolicy {
     Object key,
   }) {
     _Task task;
+    key ??= platformCall.hashCode;
     final priorityTask = _paused.remove(key);
     if (priorityTask != null) {
       debugPrint('resume task with key=$key');
@@ -39,7 +43,7 @@ class ServicePolicy {
           completer.completeError(error, stackTrace);
         }
         if (debugLabel != null) debugPrint('$runtimeType $debugLabel completed');
-        _running = null;
+        _runningQueue.removeWhere((task) => task.key == key);
         _pickNext();
       },
       completer,
@@ -64,10 +68,13 @@ class ServicePolicy {
 
   void _pickNext() {
     _notifyQueueState();
-    if (_running != null) return;
+    if (_runningQueue.length >= concurrentTaskMax) return;
     final queue = _queues.entries.firstWhere((kv) => kv.value.isNotEmpty, orElse: () => null)?.value;
-    _running = queue?.removeFirst();
+    final task = queue?.removeFirst();
-    _running?.callback?.call();
+    if (task != null) {
+      _runningQueue.addLast(task);
+      task.callback();
+    }
   }
 
   bool _takeOut(Object key, Iterable<int> priorities, void Function(int priority, _Task task) action) {
@@ -99,7 +106,7 @@ class ServicePolicy {
     if (!_queueStreamController.hasListener) return;
 
     final queueByPriority = Map.fromEntries(_queues.entries.map((kv) => MapEntry(kv.key, kv.value.length)));
-    _queueStreamController.add(QueueState(queueByPriority));
+    _queueStreamController.add(QueueState(queueByPriority, _runningQueue.length));
   }
 }
 
@@ -124,6 +131,7 @@ class ServiceCallPriority {
 
 class QueueState {
   final Map<int, int> queueByPriority;
+  final int runningQueue;
 
-  const QueueState(this.queueByPriority);
+  const QueueState(this.queueByPriority, this.runningQueue);
 }

lib/services/svg_metadata_service.dart

@@ -0,0 +1,86 @@
+import 'dart:convert';
+
+import 'package:aves/model/image_entry.dart';
+import 'package:aves/services/image_file_service.dart';
+import 'package:aves/utils/string_utils.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:xml/xml.dart';
+
+class SvgMetadataService {
+  static const docDirectory = 'Document';
+  static const metadataDirectory = 'Metadata';
+
+  static const _attributes = ['x', 'y', 'width', 'height', 'preserveAspectRatio', 'viewBox'];
+  static const _textElements = ['title', 'desc'];
+  static const _metadataElement = 'metadata';
+
+  static Future<Size> getSize(ImageEntry entry) async {
+    try {
+      final data = await ImageFileService.getImage(entry.uri, entry.mimeType, 0, false);
+
+      final document = XmlDocument.parse(utf8.decode(data));
+      final root = document.rootElement;
+
+      String getAttribute(String attributeName) => root.attributes.firstWhere((a) => a.name.qualified == attributeName, orElse: () => null)?.value;
+      double tryParseWithoutUnit(String s) => s == null ? null : double.tryParse(s.replaceAll(RegExp(r'[a-z%]'), ''));
+
+      final width = tryParseWithoutUnit(getAttribute('width'));
+      final height = tryParseWithoutUnit(getAttribute('height'));
+      if (width != null && height != null) {
+        return Size(width, height);
+      }
+
+      final viewBox = getAttribute('viewBox');
+      if (viewBox != null) {
+        final parts = viewBox.split(RegExp(r'[\s,]+'));
+        if (parts.length == 4) {
+          final vbWidth = tryParseWithoutUnit(parts[2]);
+          final vbHeight = tryParseWithoutUnit(parts[3]);
+          if (vbWidth > 0 && vbHeight > 0) {
+            return Size(vbWidth, vbHeight);
+          }
+        }
+      }
+    } catch (exception, stack) {
+      debugPrint('failed to parse XML from SVG with exception=$exception\n$stack');
+    }
+    return null;
+  }
+
+  static Future<Map<String, Map<String, String>>> getAllMetadata(ImageEntry entry) async {
+    String formatKey(String key) {
+      switch (key) {
+        case 'desc':
+          return 'Description';
+        default:
+          return key.toSentenceCase();
+      }
+    }
+
+    try {
+      final data = await ImageFileService.getImage(entry.uri, entry.mimeType, 0, false);
+
+      final document = XmlDocument.parse(utf8.decode(data));
+      final root = document.rootElement;
+
+      final docDir = Map.fromEntries([
+        ...root.attributes.where((a) => _attributes.contains(a.name.qualified)).map((a) => MapEntry(formatKey(a.name.qualified), a.value)),
+        ..._textElements.map((name) => MapEntry(formatKey(name), root.getElement(name)?.text)).where((kv) => kv.value != null),
+      ]);
+
+      final metadata = root.getElement(_metadataElement);
+      final metadataDir = Map.fromEntries([
+        if (metadata != null) MapEntry('Metadata', metadata.toXmlString(pretty: true)),
+      ]);
+
+      return {
+        if (docDir.isNotEmpty) docDirectory: docDir,
+        if (metadataDir.isNotEmpty) metadataDirectory: metadataDir,
+      };
+    } catch (exception, stack) {
+      debugPrint('failed to parse XML from SVG with exception=$exception\n$stack');
+      return null;
+    }
+  }
+}

lib/utils/constants.dart

@@ -239,12 +239,6 @@ class Constants {
       licenseUrl: 'https://github.com/Baseflow/flutter-permission-handler/blob/develop/permission_handler/LICENSE',
       sourceUrl: 'https://github.com/Baseflow/flutter-permission-handler',
     ),
-    Dependency(
-      name: 'Photo View',
-      license: 'MIT',
-      licenseUrl: 'https://github.com/renancaraujo/photo_view/blob/master/LICENSE',
-      sourceUrl: 'https://github.com/renancaraujo/photo_view',
-    ),
     Dependency(
       name: 'Printing',
       license: 'Apache 2.0',

lib/widgets/collection/grid/list_sliver.dart

@@ -4,9 +4,9 @@ import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/services/viewer_service.dart';
 import 'package:aves/widgets/collection/grid/list_known_extent.dart';
 import 'package:aves/widgets/collection/grid/list_section_layout.dart';
-import 'package:aves/widgets/common/scaling.dart';
 import 'package:aves/widgets/collection/thumbnail/decorated.dart';
 import 'package:aves/widgets/common/behaviour/routes.dart';
+import 'package:aves/widgets/common/scaling.dart';
 import 'package:aves/widgets/fullscreen/fullscreen_page.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';

lib/widgets/collection/thumbnail/decorated.dart

@@ -43,7 +43,7 @@ class DecoratedThumbnail extends StatelessWidget {
           );
 
     child = Stack(
-      fit: StackFit.passthrough,
+      alignment: Alignment.center,
       children: [
         child,
         Positioned(

lib/widgets/collection/thumbnail/vector.dart

@@ -1,6 +1,8 @@
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/settings/settings.dart';
 import 'package:aves/image_providers/uri_picture_provider.dart';
+import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/settings/entry_background.dart';
+import 'package:aves/model/settings/settings.dart';
+import 'package:aves/widgets/common/fx/checkered_decoration.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:provider/provider.dart';
@@ -19,15 +21,36 @@ class ThumbnailVectorImage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final child = Container(
+    final child = Selector<Settings, EntryBackground>(
-      // center `SvgPicture` inside `Container` with the thumbnail dimensions
+      selector: (context, s) => s.vectorBackground,
-      // so that `SvgPicture` doesn't get aligned by the `Stack` like the overlay icons
+      builder: (context, background, child) {
-      width: extent,
+        const fit = BoxFit.contain;
-      height: extent,
+        if (background == EntryBackground.checkered) {
-      child: Selector<Settings, int>(
+          return LayoutBuilder(
-        selector: (context, s) => s.svgBackground,
+            builder: (context, constraints) {
-        builder: (context, svgBackground, child) {
+              final availableSize = constraints.biggest;
-          final colorFilter = ColorFilter.mode(Color(svgBackground), BlendMode.dstOver);
+              final fitSize = applyBoxFit(fit, entry.displaySize, availableSize).destination;
+              final offset = fitSize / 2 - availableSize / 2;
+              final child = DecoratedBox(
+                decoration: CheckeredDecoration(checkSize: extent / 8, offset: offset),
+                child: SvgPicture(
+                  UriPicture(
+                    uri: entry.uri,
+                    mimeType: entry.mimeType,
+                  ),
+                  width: fitSize.width,
+                  height: fitSize.height,
+                  fit: fit,
+                ),
+              );
+              // the thumbnail is centered for correct decoration sizing
+              // when constraints are tight during hero animation
+              return constraints.isTight ? Center(child: child) : child;
+            },
+          );
+        }
+
+        final colorFilter = background.isColor ? ColorFilter.mode(background.color, BlendMode.dstOver) : null;
         return SvgPicture(
           UriPicture(
             uri: entry.uri,
@@ -36,9 +59,9 @@ class ThumbnailVectorImage extends StatelessWidget {
           ),
           width: extent,
           height: extent,
+          fit: fit,
         );
       },
-      ),
     );
     return heroTag == null
         ? child

lib/widgets/common/fx/checkered_decoration.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+
+class CheckeredDecoration extends Decoration {
+  final Color light, dark;
+  final double checkSize;
+  final Offset offset;
+
+  const CheckeredDecoration({
+    this.light = const Color(0xFF999999),
+    this.dark = const Color(0xFF666666),
+    this.checkSize = 20,
+    this.offset = Offset.zero,
+  });
+
+  @override
+  _CheckeredDecorationPainter createBoxPainter([VoidCallback onChanged]) {
+    return _CheckeredDecorationPainter(this, onChanged);
+  }
+}
+
+class _CheckeredDecorationPainter extends BoxPainter {
+  final CheckeredDecoration decoration;
+
+  const _CheckeredDecorationPainter(this.decoration, VoidCallback onChanged) : super(onChanged);
+
+  @override
+  void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) {
+    final size = configuration.size;
+    var dx = offset.dx;
+    var dy = offset.dy;
+
+    final lightPaint = Paint()..color = decoration.light;
+    final darkPaint = Paint()..color = decoration.dark;
+    final checkSize = decoration.checkSize;
+
+    // save/restore because of the clip
+    canvas.save();
+    canvas.clipRect(Rect.fromLTWH(dx, dy, size.width, size.height));
+
+    canvas.drawPaint(lightPaint);
+
+    dx += decoration.offset.dx % (decoration.checkSize * 2);
+    dy += decoration.offset.dy % (decoration.checkSize * 2);
+
+    final xMax = size.width / checkSize;
+    final yMax = size.height / checkSize;
+    for (var x = -2; x < xMax; x++) {
+      for (var y = -2; y < yMax; y++) {
+        if ((x + y) % 2 == 0) {
+          final rect = Rect.fromLTWH(dx + x * checkSize, dy + y * checkSize, checkSize, checkSize);
+          canvas.drawRect(rect, darkPaint);
+        }
+      }
+    }
+    canvas.restore();
+  }
+}

lib/widgets/common/fx/highlight_decoration.dart

@@ -6,15 +6,15 @@ class HighlightDecoration extends Decoration {
   const HighlightDecoration({@required this.color});
 
   @override
-  HighlightDecorationPainter createBoxPainter([VoidCallback onChanged]) {
+  _HighlightDecorationPainter createBoxPainter([VoidCallback onChanged]) {
-    return HighlightDecorationPainter(this, onChanged);
+    return _HighlightDecorationPainter(this, onChanged);
   }
 }
 
-class HighlightDecorationPainter extends BoxPainter {
+class _HighlightDecorationPainter extends BoxPainter {
   final HighlightDecoration decoration;
 
-  const HighlightDecorationPainter(this.decoration, VoidCallback onChanged) : super(onChanged);
+  const _HighlightDecorationPainter(this.decoration, VoidCallback onChanged) : super(onChanged);
 
   @override
   void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) {

lib/widgets/common/magnifier/controller/controller.dart

@@ -0,0 +1,128 @@
+import 'dart:async';
+import 'dart:ui';
+
+import 'package:aves/widgets/common/magnifier/controller/state.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_boundaries.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_level.dart';
+import 'package:aves/widgets/common/magnifier/scale/state.dart';
+import 'package:flutter/widgets.dart';
+
+class MagnifierController {
+  final StreamController<MagnifierState> _stateStreamController = StreamController.broadcast();
+  final StreamController<ScaleBoundaries> _scaleBoundariesStreamController = StreamController.broadcast();
+  final StreamController<ScaleStateChange> _scaleStateChangeStreamController = StreamController.broadcast();
+
+  MagnifierState _currentState, initial, previousState;
+  ScaleBoundaries _scaleBoundaries;
+  ScaleStateChange _currentScaleState, previousScaleState;
+
+  MagnifierController({
+    Offset initialPosition = Offset.zero,
+  }) : super() {
+    initial = MagnifierState(
+      position: initialPosition,
+      scale: null,
+      source: ChangeSource.internal,
+    );
+    previousState = initial;
+    _setState(initial);
+
+    final _initialScaleState = ScaleStateChange(state: ScaleState.initial, source: ChangeSource.internal);
+    previousScaleState = _initialScaleState;
+    _setScaleState(_initialScaleState);
+  }
+
+  Stream<MagnifierState> get stateStream => _stateStreamController.stream;
+
+  Stream<ScaleBoundaries> get scaleBoundariesStream => _scaleBoundariesStreamController.stream;
+
+  Stream<ScaleStateChange> get scaleStateChangeStream => _scaleStateChangeStreamController.stream;
+
+  MagnifierState get currentState => _currentState;
+
+  Offset get position => currentState.position;
+
+  double get scale => currentState.scale;
+
+  ScaleBoundaries get scaleBoundaries => _scaleBoundaries;
+
+  ScaleStateChange get scaleState => _currentScaleState;
+
+  bool get hasScaleSateChanged => previousScaleState != scaleState;
+
+  bool get isZooming => scaleState.state == ScaleState.zoomedIn || scaleState.state == ScaleState.zoomedOut;
+
+  /// Closes streams and removes eventual listeners.
+  void dispose() {
+    _stateStreamController.close();
+    _scaleBoundariesStreamController.close();
+    _scaleStateChangeStreamController.close();
+  }
+
+  void update({
+    Offset position,
+    double scale,
+    @required ChangeSource source,
+  }) {
+    position = position ?? this.position;
+    scale = scale ?? this.scale;
+    if (this.position == position && this.scale == scale) return;
+
+    previousState = currentState;
+    _setState(MagnifierState(
+      position: position,
+      scale: scale,
+      source: source,
+    ));
+  }
+
+  void setScaleState(ScaleState newValue, ChangeSource source, {Offset childFocalPoint}) {
+    if (_currentScaleState.state == newValue) return;
+
+    previousScaleState = _currentScaleState;
+    _currentScaleState = ScaleStateChange(state: newValue, source: source, childFocalPoint: childFocalPoint);
+    _scaleStateChangeStreamController.sink.add(scaleState);
+  }
+
+  void _setState(MagnifierState state) {
+    if (_currentState == state) return;
+    _currentState = state;
+    _stateStreamController.sink.add(state);
+  }
+
+  void setScaleBoundaries(ScaleBoundaries scaleBoundaries) {
+    if (_scaleBoundaries == scaleBoundaries) return;
+    _scaleBoundaries = scaleBoundaries;
+    _scaleBoundariesStreamController.sink.add(scaleBoundaries);
+
+    if (!isZooming) {
+      update(
+        scale: getScaleForScaleState(_currentScaleState.state),
+        source: ChangeSource.internal,
+      );
+    }
+  }
+
+  void _setScaleState(ScaleStateChange scaleState) {
+    if (_currentScaleState == scaleState) return;
+    _currentScaleState = scaleState;
+    _scaleStateChangeStreamController.sink.add(_currentScaleState);
+  }
+
+  double getScaleForScaleState(ScaleState scaleState) {
+    double _clamp(double scale, ScaleBoundaries boundaries) => scale.clamp(boundaries.minScale, boundaries.maxScale);
+
+    switch (scaleState) {
+      case ScaleState.initial:
+      case ScaleState.zoomedIn:
+      case ScaleState.zoomedOut:
+        return _clamp(scaleBoundaries.initialScale, scaleBoundaries);
+      case ScaleState.covering:
+        return _clamp(ScaleLevel.scaleForCovering(scaleBoundaries.viewportSize, scaleBoundaries.childSize), scaleBoundaries);
+      case ScaleState.originalSize:
+        return _clamp(1.0, scaleBoundaries);
+      default:
+        return null;
+    }
+  }
+}

lib/widgets/common/magnifier/controller/controller_delegate.dart

@@ -0,0 +1,196 @@
+import 'dart:async';
+import 'dart:ui';
+
+import 'package:aves/widgets/common/magnifier/controller/controller.dart';
+import 'package:aves/widgets/common/magnifier/controller/state.dart';
+import 'package:aves/widgets/common/magnifier/core/core.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_boundaries.dart';
+import 'package:aves/widgets/common/magnifier/scale/state.dart';
+import 'package:flutter/widgets.dart';
+
+/// A  class to hold internal layout logic to sync both controller states
+///
+/// It reacts to layout changes (eg: enter landscape or widget resize) and syncs the two controllers.
+mixin MagnifierControllerDelegate on State<MagnifierCore> {
+  MagnifierController get controller => widget.controller;
+
+  ScaleBoundaries get scaleBoundaries => controller.scaleBoundaries;
+
+  ScaleStateCycle get scaleStateCycle => widget.scaleStateCycle;
+
+  Alignment get basePosition => Alignment.center;
+
+  Function(double prevScale, double nextScale, Offset nextPosition) _animateScale;
+
+  /// Mark if scale need recalculation, useful for scale boundaries changes.
+  bool markNeedsScaleRecalc = true;
+
+  final List<StreamSubscription> _subscriptions = [];
+
+  void startListeners() {
+    _subscriptions.add(controller.stateStream.listen(_onMagnifierStateChange));
+    _subscriptions.add(controller.scaleStateChangeStream.listen(_onScaleStateChange));
+  }
+
+  void _onScaleStateChange(ScaleStateChange scaleStateChange) {
+    if (scaleStateChange.source == ChangeSource.internal) return;
+    if (!controller.hasScaleSateChanged) return;
+
+    if (_animateScale == null || controller.isZooming) {
+      controller.update(scale: scale, source: scaleStateChange.source);
+      return;
+    }
+
+    final nextScaleState = scaleStateChange.state;
+    final nextScale = controller.getScaleForScaleState(nextScaleState);
+    var nextPosition = Offset.zero;
+    if (nextScaleState == ScaleState.covering || nextScaleState == ScaleState.originalSize) {
+      final childFocalPoint = scaleStateChange.childFocalPoint;
+      if (childFocalPoint != null) {
+        nextPosition = scaleBoundaries.childToStatePosition(nextScale, childFocalPoint);
+      }
+    }
+
+    final prevScale = controller.scale ?? controller.getScaleForScaleState(controller.previousScaleState.state);
+    _animateScale(prevScale, nextScale, nextPosition);
+  }
+
+  void setScaleStateUpdateAnimation(void Function(double prevScale, double nextScale, Offset nextPosition) animateScale) {
+    _animateScale = animateScale;
+  }
+
+  void _onMagnifierStateChange(MagnifierState state) {
+    controller.update(position: clampPosition(), source: state.source);
+    if (controller.scale == controller.previousState.scale) return;
+
+    if (state.source == ChangeSource.internal || state.source == ChangeSource.animation) return;
+    final newScaleState = (scale > scaleBoundaries.initialScale) ? ScaleState.zoomedIn : ScaleState.zoomedOut;
+    controller.setScaleState(newScaleState, state.source);
+  }
+
+  Offset get position => controller.position;
+
+  double get scale {
+    final scaleState = controller.scaleState.state;
+    final needsRecalc = markNeedsScaleRecalc && !(scaleState == ScaleState.zoomedIn || scaleState == ScaleState.zoomedOut);
+    final scaleExistsOnController = controller.scale != null;
+    if (needsRecalc || !scaleExistsOnController) {
+      final newScale = controller.getScaleForScaleState(scaleState);
+      markNeedsScaleRecalc = false;
+      setScale(newScale, ChangeSource.internal);
+      return newScale;
+    }
+    return controller.scale;
+  }
+
+  void setScale(double scale, ChangeSource source) => controller.update(scale: scale, source: source);
+
+  void updateMultiple({
+    @required Offset position,
+    @required double scale,
+    @required ChangeSource source,
+  }) {
+    controller.update(position: position, scale: scale, source: source);
+  }
+
+  void updateScaleStateFromNewScale(double newScale, ChangeSource source) {
+    var newScaleState = ScaleState.initial;
+    if (scale != scaleBoundaries.initialScale) {
+      newScaleState = (newScale > scaleBoundaries.initialScale) ? ScaleState.zoomedIn : ScaleState.zoomedOut;
+    }
+    controller.setScaleState(newScaleState, source);
+  }
+
+  void nextScaleState(ChangeSource source, {Offset childFocalPoint}) {
+    final scaleState = controller.scaleState.state;
+    if (scaleState == ScaleState.zoomedIn || scaleState == ScaleState.zoomedOut) {
+      controller.setScaleState(scaleStateCycle(scaleState), source, childFocalPoint: childFocalPoint);
+      return;
+    }
+    final originalScale = controller.getScaleForScaleState(scaleState);
+
+    var prevScale = originalScale;
+    var prevScaleState = scaleState;
+    var nextScale = originalScale;
+    var nextScaleState = scaleState;
+
+    do {
+      prevScale = nextScale;
+      prevScaleState = nextScaleState;
+      nextScaleState = scaleStateCycle(prevScaleState);
+      nextScale = controller.getScaleForScaleState(nextScaleState);
+    } while (prevScale == nextScale && scaleState != nextScaleState);
+
+    if (originalScale == nextScale) return;
+    controller.setScaleState(nextScaleState, source, childFocalPoint: childFocalPoint);
+  }
+
+  CornersRange cornersX({double scale}) {
+    final _scale = scale ?? this.scale;
+
+    final computedWidth = scaleBoundaries.childSize.width * _scale;
+    final screenWidth = scaleBoundaries.viewportSize.width;
+
+    final positionX = basePosition.x;
+    final widthDiff = computedWidth - screenWidth;
+
+    final minX = ((positionX - 1).abs() / 2) * widthDiff * -1;
+    final maxX = ((positionX + 1).abs() / 2) * widthDiff;
+    return CornersRange(minX, maxX);
+  }
+
+  CornersRange cornersY({double scale}) {
+    final _scale = scale ?? this.scale;
+
+    final computedHeight = scaleBoundaries.childSize.height * _scale;
+    final screenHeight = scaleBoundaries.viewportSize.height;
+
+    final positionY = basePosition.y;
+    final heightDiff = computedHeight - screenHeight;
+
+    final minY = ((positionY - 1).abs() / 2) * heightDiff * -1;
+    final maxY = ((positionY + 1).abs() / 2) * heightDiff;
+    return CornersRange(minY, maxY);
+  }
+
+  Offset clampPosition({Offset position, double scale}) {
+    final _scale = scale ?? this.scale;
+    final _position = position ?? this.position;
+
+    final computedWidth = scaleBoundaries.childSize.width * _scale;
+    final computedHeight = scaleBoundaries.childSize.height * _scale;
+
+    final screenWidth = scaleBoundaries.viewportSize.width;
+    final screenHeight = scaleBoundaries.viewportSize.height;
+
+    var finalX = 0.0;
+    if (screenWidth < computedWidth) {
+      final cornersX = this.cornersX(scale: _scale);
+      finalX = _position.dx.clamp(cornersX.min, cornersX.max);
+    }
+
+    var finalY = 0.0;
+    if (screenHeight < computedHeight) {
+      final cornersY = this.cornersY(scale: _scale);
+      finalY = _position.dy.clamp(cornersY.min, cornersY.max);
+    }
+
+    return Offset(finalX, finalY);
+  }
+
+  @override
+  void dispose() {
+    _animateScale = null;
+    _subscriptions.forEach((sub) => sub.cancel());
+    _subscriptions.clear();
+    super.dispose();
+  }
+}
+
+/// Simple class to store a min and a max value
+class CornersRange {
+  const CornersRange(this.min, this.max);
+
+  final double min;
+  final double max;
+}

lib/widgets/common/magnifier/controller/state.dart

@@ -0,0 +1,28 @@
+import 'dart:ui';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+@immutable
+class MagnifierState {
+  const MagnifierState({
+    @required this.position,
+    @required this.scale,
+    @required this.source,
+  });
+
+  final Offset position;
+  final double scale;
+  final ChangeSource source;
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is MagnifierState && runtimeType == other.runtimeType && position == other.position && scale == other.scale;
+
+  @override
+  int get hashCode => hashValues(position, scale, source);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{position: $position, scale: $scale, source: $source}';
+}
+
+enum ChangeSource { internal, gesture, animation }

lib/widgets/common/magnifier/core/core.dart

@@ -0,0 +1,320 @@
+import 'package:aves/widgets/common/magnifier/controller/controller.dart';
+import 'package:aves/widgets/common/magnifier/controller/controller_delegate.dart';
+import 'package:aves/widgets/common/magnifier/controller/state.dart';
+import 'package:aves/widgets/common/magnifier/core/gesture_detector.dart';
+import 'package:aves/widgets/common/magnifier/magnifier.dart';
+import 'package:aves/widgets/common/magnifier/pan/corner_hit_detector.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_boundaries.dart';
+import 'package:aves/widgets/common/magnifier/scale/state.dart';
+import 'package:flutter/widgets.dart';
+
+/// Internal widget in which controls all animations lifecycle, core responses
+/// to user gestures, updates to the controller state and mounts the entire Layout
+class MagnifierCore extends StatefulWidget {
+  const MagnifierCore({
+    Key key,
+    @required this.child,
+    @required this.onTap,
+    @required this.gestureDetectorBehavior,
+    @required this.controller,
+    @required this.scaleStateCycle,
+    @required this.applyScale,
+    this.panInertia = .2,
+  }) : super(key: key);
+
+  final Widget child;
+
+  final MagnifierController controller;
+  final ScaleStateCycle scaleStateCycle;
+
+  final MagnifierTapCallback onTap;
+
+  final HitTestBehavior gestureDetectorBehavior;
+  final bool applyScale;
+  final double panInertia;
+
+  @override
+  State<StatefulWidget> createState() {
+    return MagnifierCoreState();
+  }
+}
+
+class MagnifierCoreState extends State<MagnifierCore> with TickerProviderStateMixin, MagnifierControllerDelegate, CornerHitDetector {
+  Offset _startFocalPoint, _lastViewportFocalPosition;
+  double _startScale, _quickScaleLastY, _quickScaleLastDistance;
+  bool _doubleTap, _quickScaleMoved;
+  DateTime _lastScaleGestureDate;
+
+  AnimationController _scaleAnimationController;
+  Animation<double> _scaleAnimation;
+
+  AnimationController _positionAnimationController;
+  Animation<Offset> _positionAnimation;
+
+  ScaleBoundaries cachedScaleBoundaries;
+
+  void handleScaleAnimation() {
+    setScale(_scaleAnimation.value, ChangeSource.animation);
+  }
+
+  void handlePositionAnimate() {
+    controller.update(position: _positionAnimation.value, source: ChangeSource.animation);
+  }
+
+  void onScaleStart(ScaleStartDetails details, bool doubleTap) {
+    _startScale = scale;
+    _startFocalPoint = details.localFocalPoint;
+    _lastViewportFocalPosition = _startFocalPoint;
+    _doubleTap = doubleTap;
+    _quickScaleLastDistance = null;
+    _quickScaleLastY = _startFocalPoint.dy;
+    _quickScaleMoved = false;
+
+    _scaleAnimationController.stop();
+    _positionAnimationController.stop();
+  }
+
+  void onScaleUpdate(ScaleUpdateDetails details) {
+    double newScale;
+    if (_doubleTap) {
+      // quick scale, aka one finger zoom
+      // magic numbers from `davemorrissey/subsampling-scale-image-view`
+      final focalPointY = details.focalPoint.dy;
+      final distance = (focalPointY - _startFocalPoint.dy).abs() * 2 + 20;
+      _quickScaleLastDistance ??= distance;
+      final spanDiff = (1 - (distance / _quickScaleLastDistance)).abs() * .5;
+      _quickScaleMoved |= spanDiff > .03;
+      final factor = _quickScaleMoved ? (focalPointY > _quickScaleLastY ? (1 + spanDiff) : (1 - spanDiff)) : 1;
+      _quickScaleLastDistance = distance;
+      _quickScaleLastY = focalPointY;
+      newScale = scale * factor;
+    } else {
+      newScale = _startScale * details.scale;
+    }
+    final scaleFocalPoint = _doubleTap ? _startFocalPoint : details.focalPoint;
+
+    final panPositionDelta = scaleFocalPoint - _lastViewportFocalPosition;
+    final scalePositionDelta = scaleBoundaries.viewportToStatePosition(controller, scaleFocalPoint) * (scale / newScale - 1);
+    final newPosition = position + panPositionDelta + scalePositionDelta;
+
+    updateScaleStateFromNewScale(newScale, ChangeSource.gesture);
+    updateMultiple(
+      scale: newScale,
+      position: newPosition,
+      source: ChangeSource.gesture,
+    );
+
+    _lastViewportFocalPosition = scaleFocalPoint;
+  }
+
+  void onScaleEnd(ScaleEndDetails details) {
+    final _position = controller.position;
+    final _scale = controller.scale;
+    final maxScale = scaleBoundaries.maxScale;
+    final minScale = scaleBoundaries.minScale;
+
+    // animate back to min/max scale if gesture yielded a scale exceeding them
+    if (_scale > maxScale || _scale < minScale) {
+      final newScale = _scale.clamp(minScale, maxScale);
+      final newPosition = clampPosition(position: _position * newScale / _scale, scale: newScale);
+      animateScale(_scale, newScale);
+      animatePosition(_position, newPosition);
+      return;
+    }
+
+    // The gesture recognizer triggers a new `onScaleStart` every time a pointer/finger is added or removed.
+    // Following a pinch-to-zoom gesture, a new panning gesture may start if the user does not lift both fingers at the same time,
+    // so we dismiss such panning gestures when it looks like it followed a scaling gesture.
+    final isPanning = _scale == _startScale && (DateTime.now().difference(_lastScaleGestureDate)).inMilliseconds > 100;
+
+    // animate position only when panning without scaling
+    if (isPanning) {
+      final pps = details.velocity.pixelsPerSecond;
+      if (pps != Offset.zero) {
+        final newPosition = clampPosition(position: _position + pps * widget.panInertia);
+        final tween = Tween<Offset>(begin: _position, end: newPosition);
+        const curve = Curves.easeOutCubic;
+        _positionAnimation = tween.animate(CurvedAnimation(parent: _positionAnimationController, curve: curve));
+        _positionAnimationController
+          ..duration = _getAnimationDurationForVelocity(curve: curve, tween: tween, targetPixelPerSecond: pps)
+          ..forward(from: 0.0);
+      }
+    }
+
+    if (_scale != _startScale) {
+      _lastScaleGestureDate = DateTime.now();
+    }
+  }
+
+  Duration _getAnimationDurationForVelocity({
+    Cubic curve,
+    Tween<Offset> tween,
+    Offset targetPixelPerSecond,
+  }) {
+    assert(targetPixelPerSecond != Offset.zero);
+    // find initial animation velocity over the first 20% of the specified curve
+    const t = 0.2;
+    final animationVelocity = (tween.end - tween.begin).distance * curve.transform(t) / t;
+    final gestureVelocity = targetPixelPerSecond.distance;
+    return Duration(milliseconds: (animationVelocity / gestureVelocity * 1000).round());
+  }
+
+  void onTap(TapUpDetails details) {
+    if (widget.onTap == null) return;
+
+    final viewportTapPosition = details.localPosition;
+    final childTapPosition = scaleBoundaries.viewportToChildPosition(controller, viewportTapPosition);
+    widget.onTap.call(context, details, controller.currentState, childTapPosition);
+  }
+
+  void onDoubleTap(TapDownDetails details) {
+    final viewportTapPosition = details?.localPosition;
+    final childTapPosition = scaleBoundaries.viewportToChildPosition(controller, viewportTapPosition);
+    nextScaleState(ChangeSource.gesture, childFocalPoint: childTapPosition);
+  }
+
+  void animateScale(double from, double to) {
+    _scaleAnimation = Tween<double>(
+      begin: from,
+      end: to,
+    ).animate(_scaleAnimationController);
+    _scaleAnimationController
+      ..value = 0.0
+      ..fling(velocity: 0.4);
+  }
+
+  void animatePosition(Offset from, Offset to) {
+    _positionAnimation = Tween<Offset>(begin: from, end: to).animate(_positionAnimationController);
+    _positionAnimationController
+      ..value = 0.0
+      ..fling(velocity: 0.4);
+  }
+
+  void onAnimationStatus(AnimationStatus status) {
+    if (status == AnimationStatus.completed) {
+      onAnimationStatusCompleted();
+    }
+  }
+
+  /// Check if scale is equal to initial after scale animation update
+  void onAnimationStatusCompleted() {
+    if (controller.scaleState.state != ScaleState.initial && scale == scaleBoundaries.initialScale) {
+      controller.setScaleState(ScaleState.initial, ChangeSource.animation);
+    }
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _scaleAnimationController = AnimationController(vsync: this)..addListener(handleScaleAnimation);
+    _scaleAnimationController.addStatusListener(onAnimationStatus);
+
+    _positionAnimationController = AnimationController(vsync: this)..addListener(handlePositionAnimate);
+
+    startListeners();
+    setScaleStateUpdateAnimation(animateOnScaleStateUpdate);
+
+    cachedScaleBoundaries = widget.controller.scaleBoundaries;
+  }
+
+  void animateOnScaleStateUpdate(double prevScale, double nextScale, Offset nextPosition) {
+    animateScale(prevScale, nextScale);
+    animatePosition(controller.position, nextPosition);
+  }
+
+  @override
+  void dispose() {
+    _scaleAnimationController.removeStatusListener(onAnimationStatus);
+    _scaleAnimationController.dispose();
+    _positionAnimationController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // Check if we need a recalc on the scale
+    if (widget.controller.scaleBoundaries != cachedScaleBoundaries) {
+      markNeedsScaleRecalc = true;
+      cachedScaleBoundaries = widget.controller.scaleBoundaries;
+    }
+
+    return StreamBuilder<MagnifierState>(
+        stream: controller.stateStream,
+        initialData: controller.previousState,
+        builder: (context, snapshot) {
+          if (!snapshot.hasData) return Container();
+
+          final magnifierState = snapshot.data;
+          final position = magnifierState.position;
+          final applyScale = widget.applyScale;
+
+          Widget child = CustomSingleChildLayout(
+            delegate: _CenterWithOriginalSizeDelegate(
+              scaleBoundaries.childSize,
+              basePosition,
+              applyScale,
+            ),
+            child: widget.child,
+          );
+
+          child = Transform(
+            transform: Matrix4.identity()
+              ..translate(position.dx, position.dy)
+              ..scale(applyScale ? scale : 1.0),
+            alignment: basePosition,
+            child: child,
+          );
+
+          return MagnifierGestureDetector(
+            child: child,
+            onDoubleTap: onDoubleTap,
+            onScaleStart: onScaleStart,
+            onScaleUpdate: onScaleUpdate,
+            onScaleEnd: onScaleEnd,
+            hitDetector: this,
+            onTapUp: widget.onTap == null ? null : onTap,
+          );
+        });
+  }
+}
+
+class _CenterWithOriginalSizeDelegate extends SingleChildLayoutDelegate {
+  const _CenterWithOriginalSizeDelegate(
+    this.subjectSize,
+    this.basePosition,
+    this.applyScale,
+  );
+
+  final Size subjectSize;
+  final Alignment basePosition;
+  final bool applyScale;
+
+  @override
+  Offset getPositionForChild(Size size, Size childSize) {
+    final childWidth = applyScale ? subjectSize.width : childSize.width;
+    final childHeight = applyScale ? subjectSize.height : childSize.height;
+
+    final halfWidth = (size.width - childWidth) / 2;
+    final halfHeight = (size.height - childHeight) / 2;
+
+    final offsetX = halfWidth * (basePosition.x + 1);
+    final offsetY = halfHeight * (basePosition.y + 1);
+    return Offset(offsetX, offsetY);
+  }
+
+  @override
+  BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
+    return applyScale ? BoxConstraints.tight(subjectSize) : BoxConstraints();
+  }
+
+  @override
+  bool shouldRelayout(_CenterWithOriginalSizeDelegate oldDelegate) {
+    return oldDelegate != this;
+  }
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is _CenterWithOriginalSizeDelegate && runtimeType == other.runtimeType && subjectSize == other.subjectSize && basePosition == other.basePosition && applyScale == other.applyScale;
+
+  @override
+  int get hashCode => hashValues(subjectSize, basePosition, applyScale);
+}

lib/widgets/common/magnifier/core/gesture_detector.dart

@@ -0,0 +1,94 @@
+import 'package:aves/widgets/common/magnifier/core/scale_gesture_recognizer.dart';
+import 'package:aves/widgets/common/magnifier/pan/gesture_detector_scope.dart';
+import 'package:flutter/gestures.dart';
+import 'package:flutter/widgets.dart';
+
+import '../pan/corner_hit_detector.dart';
+
+class MagnifierGestureDetector extends StatefulWidget {
+  const MagnifierGestureDetector({
+    Key key,
+    this.hitDetector,
+    this.onScaleStart,
+    this.onScaleUpdate,
+    this.onScaleEnd,
+    this.onTapDown,
+    this.onTapUp,
+    this.onDoubleTap,
+    this.behavior,
+    this.child,
+  }) : super(key: key);
+
+  final CornerHitDetector hitDetector;
+  final void Function(ScaleStartDetails details, bool doubleTap) onScaleStart;
+  final GestureScaleUpdateCallback onScaleUpdate;
+  final GestureScaleEndCallback onScaleEnd;
+
+  final GestureTapDownCallback onTapDown;
+  final GestureTapUpCallback onTapUp;
+  final GestureTapDownCallback onDoubleTap;
+
+  final HitTestBehavior behavior;
+  final Widget child;
+
+  @override
+  _MagnifierGestureDetectorState createState() => _MagnifierGestureDetectorState();
+}
+
+class _MagnifierGestureDetectorState extends State<MagnifierGestureDetector> {
+  final ValueNotifier<TapDownDetails> doubleTapDetails = ValueNotifier(null);
+
+  @override
+  Widget build(BuildContext context) {
+    final scope = MagnifierGestureDetectorScope.of(context);
+
+    final axis = scope?.axis;
+    final touchSlopFactor = scope?.touchSlopFactor;
+
+    final gestures = <Type, GestureRecognizerFactory>{};
+
+    if (widget.onTapDown != null || widget.onTapUp != null) {
+      gestures[TapGestureRecognizer] = GestureRecognizerFactoryWithHandlers<TapGestureRecognizer>(
+        () => TapGestureRecognizer(debugOwner: this),
+        (instance) {
+          instance
+            ..onTapDown = widget.onTapDown
+            ..onTapUp = widget.onTapUp;
+        },
+      );
+    }
+
+    gestures[MagnifierGestureRecognizer] = GestureRecognizerFactoryWithHandlers<MagnifierGestureRecognizer>(
+      () => MagnifierGestureRecognizer(
+        hitDetector: widget.hitDetector,
+        debugOwner: this,
+        validateAxis: axis,
+        touchSlopFactor: touchSlopFactor,
+        doubleTapDetails: doubleTapDetails,
+      ),
+      (instance) {
+        instance.onStart = (details) => widget.onScaleStart(details, doubleTapDetails.value != null);
+        instance.onUpdate = widget.onScaleUpdate;
+        instance.onEnd = widget.onScaleEnd;
+      },
+    );
+
+    gestures[DoubleTapGestureRecognizer] = GestureRecognizerFactoryWithHandlers<DoubleTapGestureRecognizer>(
+      () => DoubleTapGestureRecognizer(debugOwner: this),
+      (instance) {
+        instance.onDoubleTapCancel = () => doubleTapDetails.value = null;
+        instance.onDoubleTapDown = (details) => doubleTapDetails.value = details;
+        instance.onDoubleTap = () {
+          widget.onDoubleTap(doubleTapDetails.value);
+          doubleTapDetails.value = null;
+        };
+      },
+    );
+
+    return RawGestureDetector(
+      child: widget.child,
+      gestures: gestures,
+      behavior: widget.behavior ?? HitTestBehavior.translucent,
+    );
+  }
+}

lib/widgets/common/magnifier/core/scale_gesture_recognizer.dart

@@ -0,0 +1,145 @@
+import 'dart:math';
+
+import 'package:flutter/gestures.dart';
+import 'package:flutter/widgets.dart';
+
+import '../pan/corner_hit_detector.dart';
+
+class MagnifierGestureRecognizer extends ScaleGestureRecognizer {
+  final CornerHitDetector hitDetector;
+  final List<Axis> validateAxis;
+  final double touchSlopFactor;
+  final ValueNotifier<TapDownDetails> doubleTapDetails;
+
+  MagnifierGestureRecognizer({
+    Object debugOwner,
+    PointerDeviceKind kind,
+    this.hitDetector,
+    this.validateAxis,
+    this.touchSlopFactor = 2,
+    this.doubleTapDetails,
+  }) : super(debugOwner: debugOwner, kind: kind);
+
+  Map<int, Offset> _pointerLocations = <int, Offset>{};
+
+  Offset _initialFocalPoint;
+  Offset _currentFocalPoint;
+  double _initialSpan;
+  double _currentSpan;
+
+  bool ready = true;
+
+  @override
+  void addAllowedPointer(PointerEvent event) {
+    if (ready) {
+      ready = false;
+      _initialSpan = 0.0;
+      _currentSpan = 0.0;
+      _pointerLocations = <int, Offset>{};
+    }
+    super.addAllowedPointer(event);
+  }
+
+  @override
+  void didStopTrackingLastPointer(int pointer) {
+    ready = true;
+    super.didStopTrackingLastPointer(pointer);
+  }
+
+  @override
+  void handleEvent(PointerEvent event) {
+    if (validateAxis != null && validateAxis.isNotEmpty) {
+      var didChangeConfiguration = false;
+      if (event is PointerMoveEvent) {
+        if (!event.synthesized) {
+          _pointerLocations[event.pointer] = event.position;
+        }
+      } else if (event is PointerDownEvent) {
+        _pointerLocations[event.pointer] = event.position;
+        didChangeConfiguration = true;
+      } else if (event is PointerUpEvent || event is PointerCancelEvent) {
+        _pointerLocations.remove(event.pointer);
+        didChangeConfiguration = true;
+      }
+
+      _updateDistances();
+
+      if (didChangeConfiguration) {
+        // cf super._reconfigure
+        _initialFocalPoint = _currentFocalPoint;
+        _initialSpan = _currentSpan;
+      }
+
+      _decideIfWeAcceptEvent(event);
+    }
+    super.handleEvent(event);
+  }
+
+  void _updateDistances() {
+    // cf super._update
+    final count = _pointerLocations.keys.length;
+
+    // Compute the focal point
+    var focalPoint = Offset.zero;
+    for (final pointer in _pointerLocations.keys) {
+      focalPoint += _pointerLocations[pointer];
+    }
+    _currentFocalPoint = count > 0 ? focalPoint / count.toDouble() : Offset.zero;
+
+    // Span is the average deviation from focal point. Horizontal and vertical
+    // spans are the average deviations from the focal point's horizontal and
+    // vertical coordinates, respectively.
+    var totalDeviation = 0.0;
+    for (final pointer in _pointerLocations.keys) {
+      totalDeviation += (_currentFocalPoint - _pointerLocations[pointer]).distance;
+    }
+    _currentSpan = count > 0 ? totalDeviation / count : 0.0;
+  }
+
+  void _decideIfWeAcceptEvent(PointerEvent event) {
+    if (!(event is PointerMoveEvent)) return;
+
+    if (_pointerLocations.keys.length >= 2) {
+      // when there are multiple pointers, we always accept the gesture to scale
+      // as this is not competing with single taps or other drag gestures
+      acceptGesture(event.pointer);
+      return;
+    }
+
+    final move = _initialFocalPoint - _currentFocalPoint;
+    var shouldMove = false;
+    if (validateAxis.length == 2) {
+      // the image is the descendant of gesture detector(s) handling drag in both directions
+      final shouldMoveX = validateAxis.contains(Axis.horizontal) && hitDetector.shouldMoveX(move);
+      final shouldMoveY = validateAxis.contains(Axis.vertical) && hitDetector.shouldMoveY(move);
+      if (shouldMoveX == shouldMoveY) {
+        // consistently can/cannot pan the image in both direction the same way
+        shouldMove = shouldMoveX;
+      } else {
+        // can pan the image in one direction, but should yield to an ascendant gesture detector in the other one
+        final d = move.direction;
+        // the gesture direction angle is in ]-pi, pi], cf `Offset` doc for details
+        final xPan = (-pi / 4 < d && d < pi / 4) || (3 / 4 * pi < d && d <= pi) || (-pi < d && d < -3 / 4 * pi);
+        final yPan = (pi / 4 < d && d < 3 / 4 * pi) || (-3 / 4 * pi < d && d < -pi / 4);
+        shouldMove = (xPan && shouldMoveX) || (yPan && shouldMoveY);
+      }
+    } else {
+      // the image is the descendant of a gesture detector handling drag in one direction
+      shouldMove = validateAxis.contains(Axis.vertical) ? hitDetector.shouldMoveY(move) : hitDetector.shouldMoveX(move);
+    }
+
+    final doubleTap = doubleTapDetails?.value != null;
+    if (shouldMove || doubleTap) {
+      final spanDelta = (_currentSpan - _initialSpan).abs();
+      final focalPointDelta = (_currentFocalPoint - _initialFocalPoint).distance;
+      // warning: do not compare `focalPointDelta` to `kPanSlop`
+      // `ScaleGestureRecognizer` uses `kPanSlop`, but `HorizontalDragGestureRecognizer` uses `kTouchSlop`
+      // and the magnifier recognizer may compete with the `HorizontalDragGestureRecognizer` from a containing `PageView`
+      // setting `touchSlopFactor` to 2 restores default `ScaleGestureRecognizer` behaviour as `kPanSlop = kTouchSlop * 2.0`
+      // setting `touchSlopFactor` in [0, 1] will allow this recognizer to accept the gesture before the one from `PageView`
+      if (spanDelta > kScaleSlop || focalPointDelta > kTouchSlop * touchSlopFactor) {
+        acceptGesture(event.pointer);
+      }
+    }
+  }
+}

lib/widgets/common/magnifier/magnifier.dart

@@ -0,0 +1,140 @@
+import 'package:aves/widgets/common/magnifier/controller/controller.dart';
+import 'package:aves/widgets/common/magnifier/controller/state.dart';
+import 'package:aves/widgets/common/magnifier/core/core.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_boundaries.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_level.dart';
+import 'package:aves/widgets/common/magnifier/scale/state.dart';
+import 'package:flutter/material.dart';
+
+/// `Magnifier` is derived from `photo_view` package v0.9.2:
+/// - removed image related aspects to focus on a general purpose pan/scale viewer (à la `InteractiveViewer`)
+/// - removed rotation and many customization parameters
+/// - removed ignorable/ignoring partial notifiers
+/// - formatted, renamed and reorganized
+/// - fixed gesture recognizers when used inside a scrollable widget like `PageView`
+/// - fixed corner hit detection when in containers scrollable in both axes
+/// - fixed corner hit detection issues due to imprecise double comparisons
+/// - added single & double tap position feedback
+/// - fixed focus when scaling by double-tap/pinch
+class Magnifier extends StatefulWidget {
+  const Magnifier({
+    Key key,
+    @required this.child,
+    this.childSize,
+    this.controller,
+    this.maxScale,
+    this.minScale,
+    this.initialScale,
+    this.scaleStateCycle,
+    this.onTap,
+    this.gestureDetectorBehavior,
+    this.applyScale,
+  }) : super(key: key);
+
+  final Widget child;
+
+  /// The size of the custom [child]. This value is used to compute the relation between the child and the container's size to calculate the scale value.
+  final Size childSize;
+
+  /// Defines the maximum size in which the image will be allowed to assume, it is proportional to the original image size.
+  final ScaleLevel maxScale;
+
+  /// Defines the minimum size in which the image will be allowed to assume, it is proportional to the original image size.
+  final ScaleLevel minScale;
+
+  /// Defines the size the image will assume when the component is initialized, it is proportional to the original image size.
+  final ScaleLevel initialScale;
+
+  final MagnifierController controller;
+  final ScaleStateCycle scaleStateCycle;
+  final MagnifierTapCallback onTap;
+  final HitTestBehavior gestureDetectorBehavior;
+  final bool applyScale;
+
+  @override
+  State<StatefulWidget> createState() {
+    return _MagnifierState();
+  }
+}
+
+class _MagnifierState extends State<Magnifier> {
+  Size _childSize;
+
+  bool _controlledController;
+  MagnifierController _controller;
+
+  void _setChildSize(Size childSize) {
+    _childSize = childSize.isEmpty ? null : childSize;
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _setChildSize(widget.childSize);
+    if (widget.controller == null) {
+      _controlledController = true;
+      _controller = MagnifierController();
+    } else {
+      _controlledController = false;
+      _controller = widget.controller;
+    }
+  }
+
+  @override
+  void didUpdateWidget(Magnifier oldWidget) {
+    if (oldWidget.childSize != widget.childSize && widget.childSize != null) {
+      setState(() {
+        _setChildSize(widget.childSize);
+      });
+    }
+    if (widget.controller == null) {
+      if (!_controlledController) {
+        _controlledController = true;
+        _controller = MagnifierController();
+      }
+    } else {
+      _controlledController = false;
+      _controller = widget.controller;
+    }
+    super.didUpdateWidget(oldWidget);
+  }
+
+  @override
+  void dispose() {
+    if (_controlledController) {
+      _controller.dispose();
+    }
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return LayoutBuilder(
+      builder: (context, constraints) {
+        _controller.setScaleBoundaries(ScaleBoundaries(
+          widget.minScale ?? 0.0,
+          widget.maxScale ?? ScaleLevel(factor: double.infinity),
+          widget.initialScale ?? ScaleLevel(ref: ScaleReference.contained),
+          constraints.biggest,
+          _childSize ?? constraints.biggest,
+        ));
+
+        return MagnifierCore(
+          child: widget.child,
+          controller: _controller,
+          scaleStateCycle: widget.scaleStateCycle ?? defaultScaleStateCycle,
+          onTap: widget.onTap,
+          gestureDetectorBehavior: widget.gestureDetectorBehavior,
+          applyScale: widget.applyScale ?? true,
+        );
+      },
+    );
+  }
+}
+
+typedef MagnifierTapCallback = Function(
+  BuildContext context,
+  TapUpDetails details,
+  MagnifierState state,
+  Offset childTapPosition,
+);

lib/widgets/common/magnifier/pan/corner_hit_detector.dart

@@ -0,0 +1,76 @@
+import 'package:aves/widgets/common/magnifier/controller/controller_delegate.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+mixin CornerHitDetector on MagnifierControllerDelegate {
+  _AxisHit hitAxis() => _AxisHit(_hitCornersX(), _hitCornersY());
+
+  // the child width/height is not accurate for some image size & scale combos
+  // e.g. 3580.0 * 0.1005586592178771 yields 360.0
+  // but 4764.0 * 0.07556675062972293 yields 360.00000000000006
+  // so be sure to compare with `precisionErrorTolerance`
+
+  _CornerHit _hitCornersX() {
+    final childWidth = scaleBoundaries.childSize.width * scale;
+    final viewportWidth = scaleBoundaries.viewportSize.width;
+    if (viewportWidth + precisionErrorTolerance >= childWidth) {
+      return _CornerHit(true, true);
+    }
+    final x = -position.dx;
+    final cornersX = this.cornersX();
+    return _CornerHit(x <= cornersX.min, x >= cornersX.max);
+  }
+
+  _CornerHit _hitCornersY() {
+    final childHeight = scaleBoundaries.childSize.height * scale;
+    final viewportHeight = scaleBoundaries.viewportSize.height;
+    if (viewportHeight + precisionErrorTolerance >= childHeight) {
+      return _CornerHit(true, true);
+    }
+    final y = -position.dy;
+    final cornersY = this.cornersY();
+    return _CornerHit(y <= cornersY.min, y >= cornersY.max);
+  }
+
+  bool shouldMoveX(Offset move) {
+    final hitCornersX = _hitCornersX();
+    if (hitCornersX.hasHitAny && move != Offset.zero) {
+      if (hitCornersX.hasHitBoth) return false;
+      if (hitCornersX.hasHitMax) return move.dx < 0;
+      return move.dx > 0;
+    }
+    return true;
+  }
+
+  bool shouldMoveY(Offset move) {
+    final hitCornersY = _hitCornersY();
+    if (hitCornersY.hasHitAny && move != Offset.zero) {
+      if (hitCornersY.hasHitBoth) return false;
+      if (hitCornersY.hasHitMax) return move.dy < 0;
+      return move.dy > 0;
+    }
+    return true;
+  }
+}
+
+class _AxisHit {
+  _AxisHit(this.hasHitX, this.hasHitY);
+
+  final _CornerHit hasHitX;
+  final _CornerHit hasHitY;
+
+  bool get hasHitAny => hasHitX.hasHitAny || hasHitY.hasHitAny;
+
+  bool get hasHitBoth => hasHitX.hasHitBoth && hasHitY.hasHitBoth;
+}
+
+class _CornerHit {
+  const _CornerHit(this.hasHitMin, this.hasHitMax);
+
+  final bool hasHitMin;
+  final bool hasHitMax;
+
+  bool get hasHitAny => hasHitMin || hasHitMax;
+
+  bool get hasHitBoth => hasHitMin && hasHitMax;
+}

lib/widgets/common/magnifier/pan/gesture_detector_scope.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/widgets.dart';
+
+/// When a `Magnifier` is wrapped in this inherited widget,
+/// it will check whether the zoomed content has hit edges,
+/// and if so, will let parent gesture detectors win the gesture arena
+///
+/// Useful when placing Magnifier inside a gesture sensitive context,
+/// such as [PageView], [Dismissible], [BottomSheet].
+class MagnifierGestureDetectorScope extends InheritedWidget {
+  const MagnifierGestureDetectorScope({
+    this.axis,
+    this.touchSlopFactor = .8,
+    @required Widget child,
+  }) : super(child: child);
+
+  static MagnifierGestureDetectorScope of(BuildContext context) {
+    final scope = context.dependOnInheritedWidgetOfExactType<MagnifierGestureDetectorScope>();
+    return scope;
+  }
+
+  final List<Axis> axis;
+
+  // in [0, 1[
+  // 0: most reactive but will not let tap recognizers accept gestures
+  // <1: less reactive but gives the most leeway to other recognizers
+  // 1: will not be able to compete with a `HorizontalDragGestureRecognizer` up the widget tree
+  final double touchSlopFactor;
+
+  @override
+  bool updateShouldNotify(MagnifierGestureDetectorScope oldWidget) {
+    return axis != oldWidget.axis && touchSlopFactor != oldWidget.touchSlopFactor;
+  }
+}

lib/widgets/common/magnifier/pan/scroll_physics.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/gestures.dart';
+import 'package:flutter/widgets.dart';
+
+// `PageView` contains a `Scrollable` which sets up a `HorizontalDragGestureRecognizer`
+// this recognizer will win in the gesture arena when the drag distance reaches `kTouchSlop`
+// we cannot change that, but we can prevent the scrollable from panning until this threshold is reached
+// and let other recognizers accept the gesture instead
+class MagnifierScrollerPhysics extends ScrollPhysics {
+  const MagnifierScrollerPhysics({
+    this.touchSlopFactor = 1,
+    ScrollPhysics parent,
+  }) : super(parent: parent);
+
+  // in [0, 1]
+  // 0: most reactive but will not let Magnifier recognizers accept gestures
+  // 1: less reactive but gives the most leeway to Magnifier recognizers
+  final double touchSlopFactor;
+
+  @override
+  MagnifierScrollerPhysics applyTo(ScrollPhysics ancestor) {
+    return MagnifierScrollerPhysics(
+      touchSlopFactor: touchSlopFactor,
+      parent: buildParent(ancestor),
+    );
+  }
+
+  @override
+  double get dragStartDistanceMotionThreshold => kTouchSlop * touchSlopFactor;
+}

lib/widgets/common/magnifier/scale/scale_boundaries.dart

@@ -0,0 +1,67 @@
+import 'dart:ui';
+
+import 'package:aves/widgets/common/magnifier/controller/controller.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_level.dart';
+import 'package:flutter/foundation.dart';
+
+/// Internal class to wrap custom scale boundaries (min, max and initial)
+/// Also, stores values regarding the two sizes: the container and the child.
+class ScaleBoundaries {
+  const ScaleBoundaries(
+    this._minScale,
+    this._maxScale,
+    this._initialScale,
+    this.viewportSize,
+    this.childSize,
+  );
+
+  final ScaleLevel _minScale;
+  final ScaleLevel _maxScale;
+  final ScaleLevel _initialScale;
+  final Size viewportSize;
+  final Size childSize;
+
+  double _scaleForLevel(ScaleLevel level) {
+    final factor = level.factor;
+    switch (level.ref) {
+      case ScaleReference.contained:
+        return factor * ScaleLevel.scaleForContained(viewportSize, childSize);
+      case ScaleReference.covered:
+        return factor * ScaleLevel.scaleForCovering(viewportSize, childSize);
+      case ScaleReference.absolute:
+      default:
+        return factor;
+    }
+  }
+
+  double get minScale => _scaleForLevel(_minScale);
+
+  double get maxScale => _scaleForLevel(_maxScale).clamp(minScale, double.infinity);
+
+  double get initialScale => _scaleForLevel(_initialScale).clamp(minScale, maxScale);
+
+  Offset get _viewportCenter => viewportSize.center(Offset.zero);
+
+  Offset get _childCenter => childSize.center(Offset.zero);
+
+  Offset viewportToStatePosition(MagnifierController controller, Offset viewportPosition) {
+    return viewportPosition - _viewportCenter - controller.position;
+  }
+
+  Offset viewportToChildPosition(MagnifierController controller, Offset viewportPosition) {
+    return viewportToStatePosition(controller, viewportPosition) / controller.scale + _childCenter;
+  }
+
+  Offset childToStatePosition(double scale, Offset childPosition) {
+    return (_childCenter - childPosition) * scale;
+  }
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is ScaleBoundaries && runtimeType == other.runtimeType && _minScale == other._minScale && _maxScale == other._maxScale && _initialScale == other._initialScale && viewportSize == other.viewportSize && childSize == other.childSize;
+
+  @override
+  int get hashCode => hashValues(_minScale, _maxScale, _initialScale, viewportSize, childSize);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{viewportSize=$viewportSize, childSize=$childSize, initialScale=$initialScale, minScale=$minScale, maxScale=$maxScale}';
+}

lib/widgets/common/magnifier/scale/scale_level.dart

@@ -0,0 +1,32 @@
+import 'dart:math';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/rendering.dart';
+
+class ScaleLevel {
+  final ScaleReference ref;
+  final double factor;
+
+  const ScaleLevel({
+    this.ref = ScaleReference.absolute,
+    this.factor = 1.0,
+  });
+
+  static double scaleForContained(Size containerSize, Size childSize) => min(containerSize.width / childSize.width, containerSize.height / childSize.height);
+
+  static double scaleForCovering(Size containerSize, Size childSize) => max(containerSize.width / childSize.width, containerSize.height / childSize.height);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{ref=$ref, factor=$factor}';
+
+  @override
+  bool operator ==(Object other) {
+    if (other.runtimeType != runtimeType) return false;
+    return other is ScaleLevel && other.ref == ref && other.factor == factor;
+  }
+
+  @override
+  int get hashCode => hashValues(ref, factor);
+}
+
+enum ScaleReference { absolute, contained, covered }

lib/widgets/common/magnifier/scale/state.dart

@@ -0,0 +1,53 @@
+import 'dart:ui';
+
+import 'package:aves/widgets/common/magnifier/controller/state.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+@immutable
+class ScaleStateChange {
+  const ScaleStateChange({
+    @required this.state,
+    @required this.source,
+    this.childFocalPoint,
+  });
+
+  final ScaleState state;
+  final ChangeSource source;
+  final Offset childFocalPoint;
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || other is ScaleStateChange && runtimeType == other.runtimeType && state == other.state && childFocalPoint == other.childFocalPoint;
+
+  @override
+  int get hashCode => hashValues(state, source, childFocalPoint);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{scaleState: $state, source: $source, childFocalPoint: $childFocalPoint}';
+}
+
+enum ScaleState {
+  initial,
+  covering,
+  originalSize,
+  zoomedIn,
+  zoomedOut,
+}
+
+ScaleState defaultScaleStateCycle(ScaleState actual) {
+  switch (actual) {
+    case ScaleState.initial:
+      return ScaleState.covering;
+    case ScaleState.covering:
+      return ScaleState.originalSize;
+    case ScaleState.originalSize:
+      return ScaleState.initial;
+    case ScaleState.zoomedIn:
+    case ScaleState.zoomedOut:
+      return ScaleState.initial;
+    default:
+      return ScaleState.initial;
+  }
+}
+
+typedef ScaleStateCycle = ScaleState Function(ScaleState actual);

lib/widgets/debug/overlay.dart

@@ -20,7 +20,12 @@ class DebugTaskQueueOverlay extends StatelessWidget {
                   stream: servicePolicy.queueStream,
                   builder: (context, snapshot) {
                     if (snapshot.hasError) return SizedBox.shrink();
-                    final queuedEntries = (snapshot.hasData ? snapshot.data.queueByPriority.entries.toList() : []);
+                    final queuedEntries = <MapEntry<dynamic, int>>[];
+                    if (snapshot.hasData) {
+                      final state = snapshot.data;
+                      queuedEntries.add(MapEntry('run', state.runningQueue));
+                      queuedEntries.addAll(state.queueByPriority.entries.map((kv) => MapEntry(kv.key.toString(), kv.value)));
+                    }
                     queuedEntries.sort((a, b) => a.key.compareTo(b.key));
                     return Column(
                       mainAxisSize: MainAxisSize.min,

lib/widgets/filter_grids/album_pick.dart

@@ -177,9 +177,9 @@ class _AlbumFilterBarState extends State<AlbumFilterBar> {
           ),
           ConstrainedBox(
             constraints: BoxConstraints(minWidth: 16),
-            child: AnimatedBuilder(
+            child: ValueListenableBuilder<TextEditingValue>(
-              animation: _controller,
+              valueListenable: _controller,
-              builder: (context, child) => AnimatedSwitcher(
+              builder: (context, value, child) => AnimatedSwitcher(
                 duration: Durations.appBarActionChangeAnimation,
                 transitionBuilder: (child, animation) => FadeTransition(
                   opacity: animation,
@@ -189,7 +189,7 @@ class _AlbumFilterBarState extends State<AlbumFilterBar> {
                     child: child,
                   ),
                 ),
-                child: _controller.text.isNotEmpty ? clearButton : SizedBox.shrink(),
+                child: value.text.isNotEmpty ? clearButton : SizedBox.shrink(),
               ),
             ),
           )

lib/widgets/fullscreen/entry_action_delegate.dart

@@ -15,8 +15,6 @@ import 'package:aves/widgets/fullscreen/source_viewer_page.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter_svg/flutter_svg.dart';
-import 'package:pdf/pdf.dart';
 import 'package:pdf/widgets.dart' as pdf;
 import 'package:pedantic/pedantic.dart';
 import 'package:printing/printing.dart';
@@ -100,34 +98,32 @@ class EntryActionDelegate with FeedbackMixin, PermissionAwareMixin {
     final documentName = entry.bestTitle ?? 'Aves';
     final doc = pdf.Document(title: documentName);
 
-    PdfImage pdfImage;
+    pdf.Widget pdfChild;
     if (entry.isSvg) {
       final bytes = await ImageFileService.getImage(uri, mimeType, entry.rotationDegrees, entry.isFlipped);
       if (bytes != null && bytes.isNotEmpty) {
-        final svgRoot = await svg.fromSvgBytes(bytes, uri);
+        pdfChild = pdf.SvgImage(svg: utf8.decode(bytes));
-        final viewBox = svgRoot.viewport.viewBox;
-        // 1000 is arbitrary, but large enough to look ok in the print preview
-        final targetSize = viewBox * 1000 / viewBox.longestSide;
-        final picture = svgRoot.toPicture(size: targetSize);
-        final uiImage = await picture.toImage(targetSize.width.ceil(), targetSize.height.ceil());
-        pdfImage = await pdfImageFromImage(
-          pdf: doc.document,
-          image: uiImage,
-        );
       }
     } else {
-      pdfImage = await pdfImageFromImageProvider(
+      pdfChild = pdf.Image.provider(await flutterImageProvider(
-        pdf: doc.document,
+        UriImage(
-        image: UriImage(
           uri: uri,
           mimeType: mimeType,
           rotationDegrees: rotationDegrees,
           isFlipped: isFlipped,
         ),
-      );
+      ));
     }
-    if (pdfImage != null) {
+    if (pdfChild != null) {
-      doc.addPage(pdf.Page(build: (context) => pdf.Center(child: pdf.Image(pdfImage)))); // Page
+      doc.addPage(pdf.Page(
+        orientation: entry.isPortrait ? pdf.PageOrientation.portrait : pdf.PageOrientation.landscape,
+        build: (context) => pdf.FullPage(
+          ignoreMargins: true,
+          child: pdf.Center(
+            child: pdfChild,
+          ),
+        ),
+      )); // Page
       unawaited(Printing.layoutPdf(
         onLayout: (format) => doc.save(),
         name: documentName,

lib/widgets/fullscreen/fullscreen_body.dart

@@ -8,6 +8,7 @@ import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/theme/durations.dart';
 import 'package:aves/utils/change_notifier.dart';
 import 'package:aves/widgets/collection/collection_page.dart';
+import 'package:aves/widgets/common/magnifier/pan/scroll_physics.dart';
 import 'package:aves/widgets/fullscreen/entry_action_delegate.dart';
 import 'package:aves/widgets/fullscreen/image_page.dart';
 import 'package:aves/widgets/fullscreen/image_view.dart';
@@ -22,7 +23,6 @@ import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_ijkplayer/flutter_ijkplayer.dart';
-import 'package:photo_view/photo_view.dart';
 import 'package:provider/provider.dart';
 import 'package:screen/screen.dart';
 import 'package:tuple/tuple.dart';
@@ -557,7 +557,7 @@ class _FullscreenVerticalPageViewState extends State<FullscreenVerticalPageView>
         key: Key('vertical-pageview'),
         scrollDirection: Axis.vertical,
         controller: widget.verticalPager,
-        physics: PhotoViewPageViewScrollPhysics(parent: PageScrollPhysics()),
+        physics: MagnifierScrollerPhysics(parent: PageScrollPhysics()),
         onPageChanged: (page) {
           widget.onVerticalPageChanged(page);
           _infoPageVisibleNotifier.value = page == pages.length - 1;

lib/widgets/fullscreen/image_page.dart

@@ -1,9 +1,10 @@
 import 'package:aves/model/image_entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
+import 'package:aves/widgets/common/magnifier/pan/gesture_detector_scope.dart';
+import 'package:aves/widgets/common/magnifier/pan/scroll_physics.dart';
 import 'package:aves/widgets/fullscreen/image_view.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_ijkplayer/flutter_ijkplayer.dart';
-import 'package:photo_view/photo_view.dart';
 import 'package:tuple/tuple.dart';
 
 class MultiImagePage extends StatefulWidget {
@@ -34,13 +35,13 @@ class MultiImagePageState extends State<MultiImagePage> with AutomaticKeepAliveC
   Widget build(BuildContext context) {
     super.build(context);
 
-    return PhotoViewGestureDetectorScope(
+    return MagnifierGestureDetectorScope(
       axis: [Axis.horizontal, Axis.vertical],
       child: PageView.builder(
         key: Key('horizontal-pageview'),
         scrollDirection: Axis.horizontal,
         controller: widget.pageController,
-        physics: PhotoViewPageViewScrollPhysics(parent: BouncingScrollPhysics()),
+        physics: MagnifierScrollerPhysics(parent: BouncingScrollPhysics()),
         onPageChanged: widget.onPageChanged,
         itemBuilder: (context, index) {
           final entry = entries[index];
@@ -49,7 +50,7 @@ class MultiImagePageState extends State<MultiImagePage> with AutomaticKeepAliveC
               key: Key('imageview'),
               entry: entry,
               heroTag: widget.collection.heroTag(entry),
-              onTap: widget.onTap,
+              onTap: (_) => widget.onTap?.call(),
               videoControllers: widget.videoControllers,
               onDisposed: () => widget.onViewDisposed?.call(entry.uri),
             ),
@@ -84,11 +85,11 @@ class SingleImagePageState extends State<SingleImagePage> with AutomaticKeepAliv
   Widget build(BuildContext context) {
     super.build(context);
 
-    return PhotoViewGestureDetectorScope(
+    return MagnifierGestureDetectorScope(
       axis: [Axis.vertical],
       child: ImageView(
         entry: widget.entry,
-        onTap: widget.onTap,
+        onTap: (_) => widget.onTap?.call(),
         videoControllers: widget.videoControllers,
       ),
     );

lib/widgets/fullscreen/image_view.dart

@@ -1,29 +1,35 @@
 import 'dart:async';
 
-import 'package:aves/image_providers/thumbnail_provider.dart';
-import 'package:aves/image_providers/uri_image_provider.dart';
 import 'package:aves/image_providers/uri_picture_provider.dart';
 import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/settings/entry_background.dart';
 import 'package:aves/model/settings/settings.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:aves/widgets/collection/empty.dart';
+import 'package:aves/widgets/common/fx/checkered_decoration.dart';
+import 'package:aves/widgets/common/magnifier/controller/controller.dart';
+import 'package:aves/widgets/common/magnifier/controller/state.dart';
+import 'package:aves/widgets/common/magnifier/magnifier.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_boundaries.dart';
+import 'package:aves/widgets/common/magnifier/scale/scale_level.dart';
+import 'package:aves/widgets/common/magnifier/scale/state.dart';
 import 'package:aves/widgets/fullscreen/tiled_view.dart';
 import 'package:aves/widgets/fullscreen/video_view.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_ijkplayer/flutter_ijkplayer.dart';
 import 'package:flutter_svg/flutter_svg.dart';
-import 'package:photo_view/photo_view.dart';
-import 'package:provider/provider.dart';
 import 'package:tuple/tuple.dart';
 
 class ImageView extends StatefulWidget {
   final ImageEntry entry;
   final Object heroTag;
-  final VoidCallback onTap;
+  final MagnifierTapCallback onTap;
   final List<Tuple2<String, IjkMediaController>> videoControllers;
   final VoidCallback onDisposed;
 
+  static const decorationCheckSize = 20.0;
+
   const ImageView({
     Key key,
     @required this.entry,
@@ -38,32 +44,30 @@ class ImageView extends StatefulWidget {
 }
 
 class _ImageViewState extends State<ImageView> {
-  final PhotoViewController _photoViewController = PhotoViewController();
+  final MagnifierController _magnifierController = MagnifierController();
-  final PhotoViewScaleStateController _photoViewScaleStateController = PhotoViewScaleStateController();
   final ValueNotifier<ViewState> _viewStateNotifier = ValueNotifier(ViewState.zero);
-  StreamSubscription<PhotoViewControllerValue> _subscription;
+  final List<StreamSubscription> _subscriptions = [];
-  Size _photoViewChildSize;
 
-  static const backgroundDecoration = BoxDecoration(color: Colors.transparent);
+  static const initialScale = ScaleLevel(ref: ScaleReference.contained);
-  static const maxScale = 2.0;
+  static const minScale = ScaleLevel(ref: ScaleReference.contained);
+  static const maxScale = ScaleLevel(factor: 2.0);
 
   ImageEntry get entry => widget.entry;
 
-  VoidCallback get onTap => widget.onTap;
+  MagnifierTapCallback get onTap => widget.onTap;
 
   @override
   void initState() {
     super.initState();
-    _subscription = _photoViewController.outputStateStream.listen(_onViewChanged);
+    _subscriptions.add(_magnifierController.stateStream.listen(_onViewStateChanged));
-    if (entry.isVideo || (!entry.isSvg && entry.canDecode && useTile)) {
+    _subscriptions.add(_magnifierController.scaleBoundariesStream.listen(_onViewScaleBoundariesChanged));
-      _photoViewChildSize = entry.displaySize;
-    }
   }
 
   @override
   void dispose() {
-    _subscription.cancel();
+    _subscriptions
-    _subscription = null;
+      ..forEach((sub) => sub.cancel())
+      ..clear();
     widget.onDisposed?.call();
     super.dispose();
   }
@@ -78,19 +82,9 @@ class _ImageViewState extends State<ImageView> {
     } else if (entry.isSvg) {
       child = _buildSvgView();
     } else if (entry.canDecode) {
-      if (useTile) {
+      child = _buildRasterView();
-        child = _buildTiledImageView();
-      } else {
-        child = _buildImageView();
     }
-    }
+    child ??= ErrorChild(onTap: () => onTap?.call(null));
-    child ??= _buildError();
-
-    // if the hero tag is defined in the `loadingBuilder` and also set by the `heroAttributes`,
-    // the route transition becomes visible if the final image is loaded before the hero animation is done.
-
-    // if the hero tag wraps the whole `PhotoView` and the `loadingBuilder` is not provided,
-    // there's a black frame between the hero animation and the final image, even when it's cached.
 
     // no hero for videos, as a typical video first frame is different from its thumbnail
     return widget.heroTag != null && !entry.isVideo
@@ -102,103 +96,30 @@ class _ImageViewState extends State<ImageView> {
         : child;
   }
 
-  // the images loaded by `PhotoView` cannot have a width or height larger than 8192
+  Widget _buildRasterView() {
-  // so the reported offset and scale does not match expected values derived from the original dimensions
+    return Magnifier(
-  // besides, large images should be tiled to be memory-friendly
-  bool get useTile => entry.canTile && (entry.width > 4096 || entry.height > 4096);
-
-  ImageProvider get fastThumbnailProvider => ThumbnailProvider(ThumbnailProviderKey.fromEntry(entry));
-
-  // this loading builder shows a transition image until the final image is ready
-  // if the image is already in the cache it will show the final image, otherwise the thumbnail
-  // in any case, we should use `Center` + `AspectRatio` + `BoxFit.fill` so that the transition image
-  // appears as the final image with `PhotoViewComputedScale.contained` for `initialScale`
-  Widget _loadingBuilder(BuildContext context, ImageProvider imageProvider) {
-    return Center(
-      child: AspectRatio(
-        // enforce original aspect ratio, as some thumbnails aspect ratios slightly differ
-        aspectRatio: entry.displayAspectRatio,
-        child: Image(
-          image: imageProvider,
-          fit: BoxFit.fill,
-        ),
-      ),
-    );
-  }
-
-  Widget _buildImageView() {
-    final uriImage = UriImage(
-      uri: entry.uri,
-      mimeType: entry.mimeType,
-      rotationDegrees: entry.rotationDegrees,
-      isFlipped: entry.isFlipped,
-      expectedContentLength: entry.sizeBytes,
-    );
-    return PhotoView(
       // key includes size and orientation to refresh when the image is rotated
       key: ValueKey('${entry.rotationDegrees}_${entry.isFlipped}_${entry.width}_${entry.height}_${entry.path}'),
-      imageProvider: uriImage,
+      child: TiledImageView(
-      // when the full image is ready, we use it in the `loadingBuilder`
-      // we still provide a `loadingBuilder` in that case to avoid a black frame after hero animation
-      loadingBuilder: (context, event) => _loadingBuilder(
-        context,
-        imageCache.statusForKey(uriImage).keepAlive ? uriImage : fastThumbnailProvider,
-      ),
-      loadFailedChild: _buildError(),
-      backgroundDecoration: backgroundDecoration,
-      imageSizedCallback: (size) {
-        // do not directly update the `ViewState` notifier as this callback is called during build
-        _photoViewChildSize = size;
-      },
-      controller: _photoViewController,
-      maxScale: maxScale,
-      minScale: PhotoViewComputedScale.contained,
-      initialScale: PhotoViewComputedScale.contained,
-      onTapUp: (tapContext, details, value) => onTap?.call(),
-      filterQuality: FilterQuality.low,
-    );
-  }
-
-  Widget _buildTiledImageView() {
-    return PhotoView.customChild(
-      // key includes size and orientation to refresh when the image is rotated
-      key: ValueKey('${entry.rotationDegrees}_${entry.isFlipped}_${entry.width}_${entry.height}_${entry.path}'),
-      child: Selector<MediaQueryData, Size>(
-        selector: (context, mq) => mq.size,
-        builder: (context, mqSize, child) {
-          // When the scale state is cycled to be in its `initial` state (i.e. `contained`), and the device is rotated,
-          // `PhotoView` keeps the scale state as `contained`, but the controller does not update or notify the new scale value.
-          // We cannot use `scaleStateChangedCallback` as a workaround, because the scale state is updated before animating the scale change,
-          // so we keep receiving scale updates after the scale state update.
-          // Instead we check the scale state here when the constraints change, so we can reset the obsolete scale value.
-          if (_photoViewScaleStateController.scaleState == PhotoViewScaleState.initial) {
-            final value = PhotoViewControllerValue(position: Offset.zero, scale: 0, rotation: 0, rotationFocusPoint: null);
-            WidgetsBinding.instance.addPostFrameCallback((_) => _onViewChanged(value));
-          }
-          return TiledImageView(
         entry: entry,
-            viewportSize: mqSize,
         viewStateNotifier: _viewStateNotifier,
-            baseChild: _loadingBuilder(context, fastThumbnailProvider),
+        errorBuilder: (context, error, stackTrace) => ErrorChild(onTap: () => onTap?.call(null)),
-            errorBuilder: (context, error, stackTrace) => _buildError(),
-          );
-        },
       ),
       childSize: entry.displaySize,
-      backgroundDecoration: backgroundDecoration,
+      controller: _magnifierController,
-      controller: _photoViewController,
-      scaleStateController: _photoViewScaleStateController,
       maxScale: maxScale,
-      minScale: PhotoViewComputedScale.contained,
+      minScale: minScale,
-      initialScale: PhotoViewComputedScale.contained,
+      initialScale: initialScale,
-      onTapUp: (tapContext, details, value) => onTap?.call(),
+      onTap: (c, d, s, childPosition) => onTap?.call(childPosition),
-      filterQuality: FilterQuality.low,
+      applyScale: false,
     );
   }
 
   Widget _buildSvgView() {
-    final colorFilter = ColorFilter.mode(Color(settings.svgBackground), BlendMode.dstOver);
+    final background = settings.vectorBackground;
-    return PhotoView.customChild(
+    final colorFilter = background.isColor ? ColorFilter.mode(background.color, BlendMode.dstOver) : null;
+
+    Widget child = Magnifier(
       child: SvgPicture(
         UriPicture(
           uri: entry.uri,
@@ -206,17 +127,54 @@ class _ImageViewState extends State<ImageView> {
           colorFilter: colorFilter,
         ),
       ),
-      backgroundDecoration: backgroundDecoration,
+      childSize: entry.displaySize,
-      controller: _photoViewController,
+      controller: _magnifierController,
-      minScale: PhotoViewComputedScale.contained,
+      minScale: minScale,
-      initialScale: PhotoViewComputedScale.contained,
+      initialScale: initialScale,
-      onTapUp: (tapContext, details, value) => onTap?.call(),
+      scaleStateCycle: _vectorScaleStateCycle,
+      onTap: (c, d, s, childPosition) => onTap?.call(childPosition),
     );
+
+    if (background == EntryBackground.checkered) {
+      child = ValueListenableBuilder<ViewState>(
+        valueListenable: _viewStateNotifier,
+        builder: (context, viewState, child) {
+          final viewportSize = viewState.viewportSize;
+          if (viewportSize == null) return child;
+
+          final side = viewportSize.shortestSide;
+          final checkSize = side / ((side / ImageView.decorationCheckSize).round());
+
+          final viewSize = entry.displaySize * viewState.scale;
+          final decorationSize = applyBoxFit(BoxFit.none, viewSize, viewportSize).source;
+          final offset = ((decorationSize - viewportSize) as Offset) / 2;
+
+          return Stack(
+            alignment: Alignment.center,
+            children: [
+              Positioned(
+                width: decorationSize.width,
+                height: decorationSize.height,
+                child: DecoratedBox(
+                  decoration: CheckeredDecoration(
+                    checkSize: checkSize,
+                    offset: offset,
+                  ),
+                ),
+              ),
+              child,
+            ],
+          );
+        },
+        child: child,
+      );
+    }
+    return child;
   }
 
   Widget _buildVideoView() {
     final videoController = widget.videoControllers.firstWhere((kv) => kv.item1 == entry.uri, orElse: () => null)?.item2;
-    return PhotoView.customChild(
+    return Magnifier(
       child: videoController != null
           ? AvesVideo(
               entry: entry,
@@ -224,16 +182,69 @@ class _ImageViewState extends State<ImageView> {
             )
           : SizedBox(),
       childSize: entry.displaySize,
-      backgroundDecoration: backgroundDecoration,
+      controller: _magnifierController,
-      controller: _photoViewController,
       maxScale: maxScale,
-      minScale: PhotoViewComputedScale.contained,
+      minScale: minScale,
-      initialScale: PhotoViewComputedScale.contained,
+      initialScale: initialScale,
-      onTapUp: (tapContext, details, value) => onTap?.call(),
+      onTap: (c, d, s, childPosition) => onTap?.call(childPosition),
     );
   }
 
-  Widget _buildError() => GestureDetector(
+  void _onViewStateChanged(MagnifierState v) {
+    final current = _viewStateNotifier.value;
+    final viewState = ViewState(v.position, v.scale, current.viewportSize);
+    _viewStateNotifier.value = viewState;
+    ViewStateNotification(entry.uri, viewState).dispatch(context);
+  }
+
+  void _onViewScaleBoundariesChanged(ScaleBoundaries v) {
+    final current = _viewStateNotifier.value;
+    final viewState = ViewState(current.position, current.scale, v.viewportSize);
+    _viewStateNotifier.value = viewState;
+    ViewStateNotification(entry.uri, viewState).dispatch(context);
+  }
+
+  static ScaleState _vectorScaleStateCycle(ScaleState actual) {
+    switch (actual) {
+      case ScaleState.initial:
+        return ScaleState.covering;
+      default:
+        return ScaleState.initial;
+    }
+  }
+}
+
+class ViewState {
+  final Offset position;
+  final double scale;
+  final Size viewportSize;
+
+  static const ViewState zero = ViewState(Offset.zero, 0, null);
+
+  const ViewState(this.position, this.scale, this.viewportSize);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{position=$position, scale=$scale, viewportSize=$viewportSize}';
+}
+
+class ViewStateNotification extends Notification {
+  final String uri;
+  final ViewState viewState;
+
+  const ViewStateNotification(this.uri, this.viewState);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, viewState=$viewState}';
+}
+
+class ErrorChild extends StatelessWidget {
+  final VoidCallback onTap;
+
+  const ErrorChild({@required this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
       onTap: () => onTap?.call(),
       // use a `Container` with a dummy color to make it expand
       // so that we can also detect taps around the title `Text`
@@ -246,37 +257,7 @@ class _ImageViewState extends State<ImageView> {
         ),
       ),
     );
-
-  void _onViewChanged(PhotoViewControllerValue v) {
-    final viewState = ViewState(v.position, v.scale, _photoViewChildSize);
-    _viewStateNotifier.value = viewState;
-    ViewStateNotification(entry.uri, viewState).dispatch(context);
   }
 }
 
-class ViewState {
+typedef MagnifierTapCallback = void Function(Offset childPosition);
-  final Offset position;
-  final double scale;
-  final Size size;
-
-  static const ViewState zero = ViewState(Offset(0.0, 0.0), 0, null);
-
-  const ViewState(this.position, this.scale, this.size);
-
-  @override
-  String toString() {
-    return '$runtimeType#${shortHash(this)}{position=$position, scale=$scale, size=$size}';
-  }
-}
-
-class ViewStateNotification extends Notification {
-  final String uri;
-  final ViewState viewState;
-
-  const ViewStateNotification(this.uri, this.viewState);
-
-  @override
-  String toString() {
-    return '$runtimeType#${shortHash(this)}{uri=$uri, viewState=$viewState}';
-  }
-}

lib/widgets/fullscreen/info/metadata/metadata_section.dart

@@ -3,6 +3,7 @@ import 'dart:collection';
 import 'package:aves/model/image_entry.dart';
 import 'package:aves/ref/brand_colors.dart';
 import 'package:aves/services/metadata_service.dart';
+import 'package:aves/services/svg_metadata_service.dart';
 import 'package:aves/theme/durations.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:aves/utils/color_utils.dart';
@@ -10,8 +11,8 @@ import 'package:aves/utils/constants.dart';
 import 'package:aves/widgets/common/identity/aves_expansion_tile.dart';
 import 'package:aves/widgets/fullscreen/info/common.dart';
 import 'package:aves/widgets/fullscreen/info/metadata/metadata_thumbnail.dart';
-import 'package:aves/widgets/fullscreen/info/metadata/svg_tile.dart';
 import 'package:aves/widgets/fullscreen/info/metadata/xmp_tile.dart';
+import 'package:aves/widgets/fullscreen/source_viewer_page.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -91,9 +92,9 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
         // cancel notification bubbling so that the info page
         // does not misinterpret content scrolling for page scrolling
         onNotification: (notification) => true,
-        child: AnimatedBuilder(
+        child: ValueListenableBuilder<String>(
-          animation: _loadedMetadataUri,
+          valueListenable: _loadedMetadataUri,
-          builder: (context, child) {
+          builder: (context, uri, child) {
             Widget content;
             if (_metadata.isEmpty) {
               content = SizedBox.shrink();
@@ -118,7 +119,7 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
             return AnimationLimiter(
               // we update the limiter key after fetching the metadata of a new entry,
               // in order to restart the staggered animation of the metadata section
-              key: Key(_loadedMetadataUri.value),
+              key: Key(uri),
               child: content,
             );
           },
@@ -175,7 +176,7 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
           child: InfoRowGroup(
             dir.tags,
             maxValueLength: Constants.infoGroupMaxValueLength,
-            linkHandlers: dirName == SvgMetadata.metadataDirectory ? SvgMetadata.getLinkHandlers(dir.tags) : null,
+            linkHandlers: dirName == SvgMetadataService.metadataDirectory ? getSvgLinkHandlers(dir.tags) : null,
           ),
         ),
       ],
@@ -192,7 +193,7 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
     if (entry == null) return;
     if (_loadedMetadataUri.value == entry.uri) return;
     if (isVisible) {
-      final rawMetadata = await (entry.isSvg ? SvgMetadata.getAllMetadata(entry) : MetadataService.getAllMetadata(entry)) ?? {};
+      final rawMetadata = await (entry.isSvg ? SvgMetadataService.getAllMetadata(entry) : MetadataService.getAllMetadata(entry)) ?? {};
       final directories = rawMetadata.entries.map((dirKV) {
         var directoryName = dirKV.key as String ?? '';
 
@@ -230,6 +231,25 @@ class _MetadataSectionSliverState extends State<MetadataSectionSliver> with Auto
     _expandedDirectoryNotifier.value = null;
   }
 
+  static Map<String, InfoLinkHandler> getSvgLinkHandlers(SplayTreeMap<String, String> tags) {
+    return {
+      'Metadata': InfoLinkHandler(
+        linkText: 'View XML',
+        onTap: (context) {
+          Navigator.push(
+            context,
+            MaterialPageRoute(
+              settings: RouteSettings(name: SourceViewerPage.routeName),
+              builder: (context) => SourceViewerPage(
+                loader: () => SynchronousFuture(tags['Metadata']),
+              ),
+            ),
+          );
+        },
+      ),
+    };
+  }
+
   @override
   bool get wantKeepAlive => true;
 }

lib/widgets/fullscreen/info/metadata/svg_tile.dart

@@ -1,76 +0,0 @@
-import 'dart:collection';
-import 'dart:convert';
-
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/services/image_file_service.dart';
-import 'package:aves/utils/string_utils.dart';
-import 'package:aves/widgets/fullscreen/info/common.dart';
-import 'package:aves/widgets/fullscreen/source_viewer_page.dart';
-import 'package:flutter/cupertino.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
-import 'package:xml/xml.dart';
-
-class SvgMetadata {
-  static const docDirectory = 'Document';
-  static const metadataDirectory = 'Metadata';
-
-  static const _attributes = ['x', 'y', 'width', 'height', 'preserveAspectRatio', 'viewBox'];
-  static const _textElements = ['title', 'desc'];
-  static const _metadataElement = 'metadata';
-
-  static Future<Map<String, Map<String, String>>> getAllMetadata(ImageEntry entry) async {
-    try {
-      final data = await ImageFileService.getImage(entry.uri, entry.mimeType, 0, false);
-
-      final document = XmlDocument.parse(utf8.decode(data));
-      final root = document.rootElement;
-
-      final docDir = Map.fromEntries([
-        ...root.attributes.where((a) => _attributes.contains(a.name.qualified)).map((a) => MapEntry(_formatKey(a.name.qualified), a.value)),
-        ..._textElements.map((name) => MapEntry(_formatKey(name), root.getElement(name)?.text)).where((kv) => kv.value != null),
-      ]);
-
-      final metadata = root.getElement(_metadataElement);
-      final metadataDir = Map.fromEntries([
-        if (metadata != null) MapEntry('Metadata', metadata.toXmlString(pretty: true)),
-      ]);
-
-      return {
-        if (docDir.isNotEmpty) docDirectory: docDir,
-        if (metadataDir.isNotEmpty) metadataDirectory: metadataDir,
-      };
-    } catch (exception, stack) {
-      debugPrint('failed to parse XML from SVG with exception=$exception\n$stack');
-      return null;
-    }
-  }
-
-  static Map<String, InfoLinkHandler> getLinkHandlers(SplayTreeMap<String, String> tags) {
-    return {
-      'Metadata': InfoLinkHandler(
-        linkText: 'View XML',
-        onTap: (context) {
-          Navigator.push(
-            context,
-            MaterialPageRoute(
-              settings: RouteSettings(name: SourceViewerPage.routeName),
-              builder: (context) => SourceViewerPage(
-                loader: () => SynchronousFuture(tags['Metadata']),
-              ),
-            ),
-          );
-        },
-      ),
-    };
-  }
-
-  static String _formatKey(String key) {
-    switch (key) {
-      case 'desc':
-        return 'Description';
-      default:
-        return key.toSentenceCase();
-    }
-  }
-}

lib/widgets/fullscreen/info/metadata/xmp_namespaces.dart

@@ -95,9 +95,7 @@ class XmpNamespace {
   int get hashCode => namespace.hashCode;
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{namespace=$namespace}';
-    return '$runtimeType#${shortHash(this)}{namespace=$namespace}';
-  }
 }
 
 class XmpProp {
@@ -116,9 +114,7 @@ class XmpProp {
   }
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{path=$path, value=$value}';
-    return '$runtimeType#${shortHash(this)}{path=$path, value=$value}';
-  }
 }
 
 class OpenEmbeddedDataNotification extends Notification {
@@ -131,7 +127,5 @@ class OpenEmbeddedDataNotification extends Notification {
   });
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{propPath=$propPath, mimeType=$mimeType}';
-    return '$runtimeType#${shortHash(this)}{propPath=$propPath, mimeType=$mimeType}';
-  }
 }

lib/widgets/fullscreen/overlay/bottom.dart

@@ -278,7 +278,7 @@ class _DateRow extends StatelessWidget {
         DecoratedIcon(AIcons.date, shadows: [Constants.embossShadow], size: _iconSize),
         SizedBox(width: _iconPadding),
         Expanded(flex: 3, child: Text(dateText, strutStyle: Constants.overflowStrutStyle)),
-        if (!entry.isSvg) Expanded(flex: 2, child: Text(entry.resolutionText, strutStyle: Constants.overflowStrutStyle)),
+        Expanded(flex: 2, child: Text(entry.isSvg ? entry.aspectRatioText : entry.resolutionText, strutStyle: Constants.overflowStrutStyle)),
       ],
     );
   }

lib/widgets/fullscreen/overlay/minimap.dart

@@ -4,7 +4,6 @@ import 'package:aves/model/image_entry.dart';
 import 'package:aves/widgets/fullscreen/image_view.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
 
 class Minimap extends StatelessWidget {
   final ImageEntry entry;
@@ -21,25 +20,24 @@ class Minimap extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Selector<MediaQueryData, Size>(
+    return IgnorePointer(
-        selector: (context, mq) => mq.size,
+      child: ValueListenableBuilder<ViewState>(
-        builder: (context, mqSize, child) {
+          valueListenable: viewStateNotifier,
-          return AnimatedBuilder(
+          builder: (context, viewState, child) {
-              animation: viewStateNotifier,
+            final viewportSize = viewState.viewportSize;
-              builder: (context, child) {
+            if (viewportSize == null) return SizedBox.shrink();
-                final viewState = viewStateNotifier.value;
             return CustomPaint(
               painter: MinimapPainter(
-                    viewportSize: mqSize,
+                viewportSize: viewportSize,
-                    entrySize: viewState.size ?? entry.displaySize,
+                entrySize: entry.displaySize,
                 viewCenterOffset: viewState.position,
                 viewScale: viewState.scale,
                 minimapBorderColor: Colors.white30,
               ),
               size: size,
             );
-              });
+          }),
-        });
+    );
   }
 }
 

lib/widgets/fullscreen/tiled_view.dart

@@ -1,24 +1,26 @@
 import 'dart:math';
 
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/utils/math_utils.dart';
 import 'package:aves/image_providers/region_provider.dart';
+import 'package:aves/image_providers/thumbnail_provider.dart';
+import 'package:aves/image_providers/uri_image_provider.dart';
+import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/settings/entry_background.dart';
+import 'package:aves/model/settings/settings.dart';
+import 'package:aves/utils/math_utils.dart';
+import 'package:aves/widgets/common/fx/checkered_decoration.dart';
 import 'package:aves/widgets/fullscreen/image_view.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:tuple/tuple.dart';
 
 class TiledImageView extends StatefulWidget {
   final ImageEntry entry;
-  final Size viewportSize;
   final ValueNotifier<ViewState> viewStateNotifier;
-  final Widget baseChild;
   final ImageErrorWidgetBuilder errorBuilder;
 
   const TiledImageView({
     @required this.entry,
-    @required this.viewportSize,
     @required this.viewStateNotifier,
-    @required this.baseChild,
     @required this.errorBuilder,
   });
 
@@ -27,86 +29,274 @@ class TiledImageView extends StatefulWidget {
 }
 
 class _TiledImageViewState extends State<TiledImageView> {
-  double _tileSide, _initialScale;
+  bool _isTilingInitialized = false;
   int _maxSampleSize;
-  Matrix4 _transform;
+  double _tileSide;
+  Matrix4 _tileTransform;
+  ImageStream _fullImageStream;
+  ImageStreamListener _fullImageListener;
+  final ValueNotifier<bool> _fullImageLoaded = ValueNotifier(false);
 
   ImageEntry get entry => widget.entry;
 
-  Size get viewportSize => widget.viewportSize;
-
   ValueNotifier<ViewState> get viewStateNotifier => widget.viewStateNotifier;
 
+  bool get useBackground => entry.canHaveAlpha && settings.rasterBackground != EntryBackground.transparent;
+
+  bool get useTiles => entry.canTile && (entry.width > 4096 || entry.height > 4096);
+
+  ImageProvider get thumbnailProvider => ThumbnailProvider(ThumbnailProviderKey.fromEntry(entry));
+
+  ImageProvider get fullImageProvider {
+    if (useTiles) {
+      assert(_isTilingInitialized);
+      final displayWidth = entry.displaySize.width.round();
+      final displayHeight = entry.displaySize.height.round();
+      final viewState = viewStateNotifier.value;
+      final regionRect = _getTileRects(
+        x: 0,
+        y: 0,
+        layerRegionWidth: displayWidth,
+        layerRegionHeight: displayHeight,
+        displayWidth: displayWidth,
+        displayHeight: displayHeight,
+        scale: viewState.scale,
+        viewRect: _getViewRect(viewState, displayWidth, displayHeight),
+      ).item2;
+      return RegionProvider(RegionProviderKey.fromEntry(
+        entry,
+        sampleSize: _maxSampleSize,
+        rect: regionRect,
+      ));
+    } else {
+      return UriImage(
+        uri: entry.uri,
+        mimeType: entry.mimeType,
+        rotationDegrees: entry.rotationDegrees,
+        isFlipped: entry.isFlipped,
+        expectedContentLength: entry.sizeBytes,
+      );
+    }
+  }
+
   // magic number used to derive sample size from scale
   static const scaleFactor = 2.0;
 
   @override
   void initState() {
     super.initState();
-    _init();
+    _fullImageListener = ImageStreamListener(_onFullImageCompleted);
+    if (!useTiles) _registerFullImage();
   }
 
   @override
   void didUpdateWidget(TiledImageView oldWidget) {
     super.didUpdateWidget(oldWidget);
 
-    if (oldWidget.viewportSize != widget.viewportSize || oldWidget.entry.displaySize != widget.entry.displaySize) {
+    final oldViewState = oldWidget.viewStateNotifier.value;
-      _init();
+    final viewState = widget.viewStateNotifier.value;
+    if (oldWidget.entry != widget.entry || oldViewState.viewportSize != viewState.viewportSize) {
+      _isTilingInitialized = false;
+      _fullImageLoaded.value = false;
+      _unregisterFullImage();
     }
   }
 
-  void _init() {
+  @override
-    _tileSide = viewportSize.shortestSide * scaleFactor;
+  void dispose() {
-    _initialScale = min(viewportSize.width / entry.displaySize.width, viewportSize.height / entry.displaySize.height);
+    _unregisterFullImage();
-    _maxSampleSize = _sampleSizeForScale(_initialScale);
+    super.dispose();
-
-    final rotationDegrees = entry.rotationDegrees;
-    final isFlipped = entry.isFlipped;
-    _transform = null;
-    if (rotationDegrees != 0 || isFlipped) {
-      _transform = Matrix4.identity()
-        ..translate(entry.width / 2.0, entry.height / 2.0)
-        ..scale(isFlipped ? -1.0 : 1.0, 1.0, 1.0)
-        ..rotateZ(-toRadians(rotationDegrees.toDouble()))
-        ..translate(-entry.displaySize.width / 2.0, -entry.displaySize.height / 2.0);
   }
+
+  void _registerFullImage() {
+    _fullImageStream = fullImageProvider.resolve(ImageConfiguration.empty);
+    _fullImageStream.addListener(_fullImageListener);
+  }
+
+  void _unregisterFullImage() {
+    _fullImageStream?.removeListener(_fullImageListener);
+    _fullImageStream = null;
+  }
+
+  void _onFullImageCompleted(ImageInfo image, bool synchronousCall) {
+    _unregisterFullImage();
+    _fullImageLoaded.value = true;
   }
 
   @override
   Widget build(BuildContext context) {
     if (viewStateNotifier == null) return SizedBox.shrink();
 
-    final displayWidth = entry.displaySize.width.round();
+    return ValueListenableBuilder<ViewState>(
-    final displayHeight = entry.displaySize.height.round();
+      valueListenable: viewStateNotifier,
+      builder: (context, viewState, child) {
+        final viewportSize = viewState.viewportSize;
+        final viewportSized = viewportSize != null;
+        if (viewportSized && useTiles && !_isTilingInitialized) _initTiling(viewportSize);
 
-    return AnimatedBuilder(
+        return SizedBox.fromSize(
-        animation: viewStateNotifier,
+          size: entry.displaySize * viewState.scale,
-        builder: (context, child) {
+          child: Stack(
-          final viewState = viewStateNotifier.value;
+            alignment: Alignment.center,
-          var scale = viewState.scale;
+            children: [
-          if (scale == 0.0) {
+              if (useBackground && viewportSized) _buildBackground(viewState),
-            // for initial scale as `PhotoViewComputedScale.contained`
+              _buildLoading(viewState),
-            scale = _initialScale;
+              if (useTiles) ..._getTiles(viewState),
+              if (!useTiles)
+                Image(
+                  image: fullImageProvider,
+                  gaplessPlayback: true,
+                  errorBuilder: widget.errorBuilder,
+                  width: (entry.displaySize * viewState.scale).width,
+                  fit: BoxFit.contain,
+                  filterQuality: FilterQuality.medium,
+                ),
+            ],
+          ),
+        );
+      },
+    );
   }
 
-          final centerOffset = viewState.position;
+  void _initTiling(Size viewportSize) {
-          final viewOrigin = Offset(
+    final displaySize = entry.displaySize;
-            ((displayWidth * scale - viewportSize.width) / 2 - centerOffset.dx),
+    _tileSide = viewportSize.shortestSide * scaleFactor;
-            ((displayHeight * scale - viewportSize.height) / 2 - centerOffset.dy),
+    // scale for initial state `contained`
+    final containedScale = min(viewportSize.width / displaySize.width, viewportSize.height / displaySize.height);
+    _maxSampleSize = _sampleSizeForScale(containedScale);
+
+    final rotationDegrees = entry.rotationDegrees;
+    final isFlipped = entry.isFlipped;
+    _tileTransform = null;
+    if (rotationDegrees != 0 || isFlipped) {
+      _tileTransform = Matrix4.identity()
+        ..translate(entry.width / 2.0, entry.height / 2.0)
+        ..scale(isFlipped ? -1.0 : 1.0, 1.0, 1.0)
+        ..rotateZ(-toRadians(rotationDegrees.toDouble()))
+        ..translate(-displaySize.width / 2.0, -displaySize.height / 2.0);
+    }
+    _isTilingInitialized = true;
+    _registerFullImage();
+  }
+
+  Widget _buildLoading(ViewState viewState) {
+    return ValueListenableBuilder(
+      valueListenable: _fullImageLoaded,
+      builder: (context, fullImageLoaded, child) {
+        if (fullImageLoaded) return SizedBox.shrink();
+
+        return Center(
+          child: AspectRatio(
+            // enforce original aspect ratio, as some thumbnails aspect ratios slightly differ
+            aspectRatio: entry.displayAspectRatio,
+            child: Image(
+              image: thumbnailProvider,
+              fit: BoxFit.fill,
+            ),
+          ),
         );
-          final viewRect = viewOrigin & viewportSize;
+      },
+    );
+  }
+
+  Widget _buildBackground(ViewState viewState) {
+    final viewportSize = viewState.viewportSize;
+    assert(viewportSize != null);
+
+    final viewSize = entry.displaySize * viewState.scale;
+    final decorationOffset = ((viewSize - viewportSize) as Offset) / 2 - viewState.position;
+    final decorationSize = applyBoxFit(BoxFit.none, viewSize, viewportSize).source;
+
+    Decoration decoration;
+    final background = settings.rasterBackground;
+    if (background == EntryBackground.checkered) {
+      final side = viewportSize.shortestSide;
+      final checkSize = side / ((side / ImageView.decorationCheckSize).round());
+      final offset = ((decorationSize - viewportSize) as Offset) / 2;
+      decoration = CheckeredDecoration(
+        checkSize: checkSize,
+        offset: offset,
+      );
+    } else {
+      decoration = BoxDecoration(
+        color: background.color,
+      );
+    }
+    return Positioned(
+      left: decorationOffset.dx >= 0 ? decorationOffset.dx : null,
+      top: decorationOffset.dy >= 0 ? decorationOffset.dy : null,
+      width: decorationSize.width,
+      height: decorationSize.height,
+      child: DecoratedBox(
+        decoration: decoration,
+      ),
+    );
+  }
+
+  List<Widget> _getTiles(ViewState viewState) {
+    if (!_isTilingInitialized) return [];
+
+    final displayWidth = entry.displaySize.width.round();
+    final displayHeight = entry.displaySize.height.round();
+    final viewRect = _getViewRect(viewState, displayWidth, displayHeight);
+    final scale = viewState.scale;
 
     final tiles = <RegionTile>[];
     var minSampleSize = min(_sampleSizeForScale(scale), _maxSampleSize);
     for (var sampleSize = _maxSampleSize; sampleSize >= minSampleSize; sampleSize = (sampleSize / 2).floor()) {
       // for the largest sample size (matching the initial scale), the whole image is in view
-            // so we subsample the whole image instead of splitting it in tiles
+      // so we subsample the whole image without tiling
-            final useTiles = sampleSize != _maxSampleSize;
+      final fullImageRegion = sampleSize == _maxSampleSize;
       final regionSide = (_tileSide * sampleSize).round();
-            final layerRegionWidth = useTiles ? regionSide : displayWidth;
+      final layerRegionWidth = fullImageRegion ? displayWidth : regionSide;
-            final layerRegionHeight = useTiles ? regionSide : displayHeight;
+      final layerRegionHeight = fullImageRegion ? displayHeight : regionSide;
       for (var x = 0; x < displayWidth; x += layerRegionWidth) {
         for (var y = 0; y < displayHeight; y += layerRegionHeight) {
+          final rects = _getTileRects(
+            x: x,
+            y: y,
+            layerRegionWidth: layerRegionWidth,
+            layerRegionHeight: layerRegionHeight,
+            displayWidth: displayWidth,
+            displayHeight: displayHeight,
+            scale: scale,
+            viewRect: viewRect,
+          );
+          if (rects != null) {
+            tiles.add(RegionTile(
+              entry: entry,
+              tileRect: rects.item1,
+              regionRect: rects.item2,
+              sampleSize: sampleSize,
+            ));
+          }
+        }
+      }
+    }
+    return tiles;
+  }
+
+  Rect _getViewRect(ViewState viewState, int displayWidth, int displayHeight) {
+    final scale = viewState.scale;
+    final centerOffset = viewState.position;
+    final viewportSize = viewState.viewportSize;
+    final viewOrigin = Offset(
+      ((displayWidth * scale - viewportSize.width) / 2 - centerOffset.dx),
+      ((displayHeight * scale - viewportSize.height) / 2 - centerOffset.dy),
+    );
+    return viewOrigin & viewportSize;
+  }
+
+  Tuple2<Rect, Rectangle<int>> _getTileRects({
+    @required int x,
+    @required int y,
+    @required int layerRegionWidth,
+    @required int layerRegionHeight,
+    @required int displayWidth,
+    @required int displayHeight,
+    @required double scale,
+    @required Rect viewRect,
+  }) {
     final nextX = x + layerRegionWidth;
     final nextY = y + layerRegionHeight;
     final thisRegionWidth = layerRegionWidth - (nextX >= displayWidth ? nextX - displayWidth : 0);
@@ -114,14 +304,14 @@ class _TiledImageViewState extends State<TiledImageView> {
     final tileRect = Rect.fromLTWH(x * scale, y * scale, thisRegionWidth * scale, thisRegionHeight * scale);
 
     // only build visible tiles
-                if (viewRect.overlaps(tileRect)) {
+    if (!viewRect.overlaps(tileRect)) return null;
-                  Rectangle<int> regionRect;
 
-                  if (_transform != null) {
+    Rectangle<int> regionRect;
+    if (_tileTransform != null) {
       // apply EXIF orientation
       final regionRectDouble = Rect.fromLTWH(x.toDouble(), y.toDouble(), thisRegionWidth.toDouble(), thisRegionHeight.toDouble());
-                    final tl = MatrixUtils.transformPoint(_transform, regionRectDouble.topLeft);
+      final tl = MatrixUtils.transformPoint(_tileTransform, regionRectDouble.topLeft);
-                    final br = MatrixUtils.transformPoint(_transform, regionRectDouble.bottomRight);
+      final br = MatrixUtils.transformPoint(_tileTransform, regionRectDouble.bottomRight);
       regionRect = Rectangle<int>.fromPoints(
         Point<int>(tl.dx.round(), tl.dy.round()),
         Point<int>(br.dx.round(), br.dy.round()),
@@ -129,30 +319,7 @@ class _TiledImageViewState extends State<TiledImageView> {
     } else {
       regionRect = Rectangle<int>(x, y, thisRegionWidth, thisRegionHeight);
     }
-
+    return Tuple2<Rect, Rectangle<int>>(tileRect, regionRect);
-                  tiles.add(RegionTile(
-                    entry: entry,
-                    tileRect: tileRect,
-                    regionRect: regionRect,
-                    sampleSize: sampleSize,
-                  ));
-                }
-              }
-            }
-          }
-
-          return Stack(
-            alignment: Alignment.center,
-            children: [
-              SizedBox(
-                width: displayWidth * scale,
-                height: displayHeight * scale,
-                child: widget.baseChild,
-              ),
-              ...tiles,
-            ],
-          );
-        });
   }
 
   int _sampleSizeForScale(double scale) {

lib/widgets/settings/entry_background.dart

@@ -0,0 +1,78 @@
+import 'package:aves/model/settings/entry_background.dart';
+import 'package:aves/widgets/common/fx/borders.dart';
+import 'package:aves/widgets/common/fx/checkered_decoration.dart';
+import 'package:flutter/material.dart';
+
+class EntryBackgroundSelector extends StatefulWidget {
+  final ValueGetter<EntryBackground> getter;
+  final ValueSetter<EntryBackground> setter;
+
+  const EntryBackgroundSelector({
+    @required this.getter,
+    @required this.setter,
+  });
+
+  @override
+  _EntryBackgroundSelectorState createState() => _EntryBackgroundSelectorState();
+}
+
+class _EntryBackgroundSelectorState extends State<EntryBackgroundSelector> {
+  @override
+  Widget build(BuildContext context) {
+    return DropdownButtonHideUnderline(
+      child: DropdownButton<EntryBackground>(
+        items: _buildItems(context),
+        value: widget.getter(),
+        onChanged: (selected) {
+          widget.setter(selected);
+          setState(() {});
+        },
+      ),
+    );
+  }
+
+  List<DropdownMenuItem<EntryBackground>> _buildItems(BuildContext context) {
+    const radius = 12.0;
+    return [
+      EntryBackground.white,
+      EntryBackground.black,
+      EntryBackground.checkered,
+      EntryBackground.transparent,
+    ].map((selected) {
+      Widget child;
+      switch (selected) {
+        case EntryBackground.transparent:
+          child = Icon(
+            Icons.clear,
+            size: 20,
+            color: Colors.white30,
+          );
+          break;
+        case EntryBackground.checkered:
+          child = ClipOval(
+            child: DecoratedBox(
+              decoration: CheckeredDecoration(
+                checkSize: radius,
+              ),
+            ),
+          );
+          break;
+        default:
+          break;
+      }
+      return DropdownMenuItem<EntryBackground>(
+        value: selected,
+        child: Container(
+          height: radius * 2,
+          width: radius * 2,
+          decoration: BoxDecoration(
+            color: selected.isColor ? selected.color : null,
+            border: AvesCircleBorder.build(context),
+            shape: BoxShape.circle,
+          ),
+          child: child,
+        ),
+      );
+    }).toList();
+  }
+}

lib/widgets/settings/settings_page.dart

@@ -8,7 +8,7 @@ import 'package:aves/widgets/common/identity/aves_expansion_tile.dart';
 import 'package:aves/widgets/common/providers/media_query_data_provider.dart';
 import 'package:aves/widgets/dialogs/aves_selection_dialog.dart';
 import 'package:aves/widgets/settings/access_grants.dart';
-import 'package:aves/widgets/settings/svg_background.dart';
+import 'package:aves/widgets/settings/entry_background.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_staggered_animations/flutter_staggered_animations.dart';
 import 'package:provider/provider.dart';
@@ -115,8 +115,18 @@ class _SettingsPageState extends State<SettingsPage> {
           },
         ),
         ListTile(
-          title: Text('SVG background'),
+          title: Text('Raster image background'),
-          trailing: SvgBackgroundSelector(),
+          trailing: EntryBackgroundSelector(
+            getter: () => settings.rasterBackground,
+            setter: (value) => settings.rasterBackground = value,
+          ),
+        ),
+        ListTile(
+          title: Text('Vector image background'),
+          trailing: EntryBackgroundSelector(
+            getter: () => settings.vectorBackground,
+            setter: (value) => settings.vectorBackground = value,
+          ),
         ),
         ListTile(
           title: Text('Coordinate format'),

lib/widgets/settings/svg_background.dart

@@ -1,45 +0,0 @@
-import 'package:aves/model/settings/settings.dart';
-import 'package:aves/widgets/common/fx/borders.dart';
-import 'package:flutter/material.dart';
-
-class SvgBackgroundSelector extends StatefulWidget {
-  @override
-  _SvgBackgroundSelectorState createState() => _SvgBackgroundSelectorState();
-}
-
-class _SvgBackgroundSelectorState extends State<SvgBackgroundSelector> {
-  @override
-  Widget build(BuildContext context) {
-    const radius = 24.0;
-    return DropdownButtonHideUnderline(
-      child: DropdownButton<int>(
-        items: [0xFFFFFFFF, 0xFF000000, 0x00000000].map((selected) {
-          return DropdownMenuItem<int>(
-            value: selected,
-            child: Container(
-              height: radius,
-              width: radius,
-              decoration: BoxDecoration(
-                color: Color(selected),
-                border: AvesCircleBorder.build(context),
-                shape: BoxShape.circle,
-              ),
-              child: selected == 0
-                  ? Icon(
-                      Icons.clear,
-                      size: 20,
-                      color: Colors.white30,
-                    )
-                  : null,
-            ),
-          );
-        }).toList(),
-        value: settings.svgBackground,
-        onChanged: (selected) {
-          settings.svgBackground = selected;
-          setState(() {});
-        },
-      ),
-    );
-  }
-}

lib/widgets/stats/stats.dart

@@ -295,7 +295,5 @@ class EntryByMimeDatum {
   Color get color => stringToColor(displayText);
 
   @override
-  String toString() {
+  String toString() => '$runtimeType#${shortHash(this)}{mimeType=$mimeType, displayText=$displayText, entryCount=$entryCount}';
-    return '[$runtimeType#${shortHash(this)}: mimeType=$mimeType, displayText=$displayText, entryCount=$entryCount]';
-  }
 }

pubspec.lock

@@ -63,7 +63,7 @@ packages:
       name: cached_network_image
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.1"
+    version: "2.5.0"
   characters:
     dependency: transitive
     description:
@@ -282,7 +282,7 @@ packages:
       name: flutter_cache_manager
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0"
   flutter_cube:
     dependency: transitive
     description:
@@ -605,7 +605,7 @@ packages:
       name: panorama
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.0"
+    version: "0.1.2"
   path:
     dependency: transitive
     description:
@@ -668,7 +668,7 @@ packages:
       name: pdf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.12.0"
+    version: "1.13.0"
   pedantic:
     dependency: "direct main"
     description:
@@ -682,7 +682,7 @@ packages:
       name: percent_indicator
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.8"
+    version: "2.1.9"
   permission_handler:
     dependency: "direct main"
     description:
@@ -704,15 +704,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.1.0"
-  photo_view:
-    dependency: "direct main"
-    description:
-      path: "."
-      ref: HEAD
-      resolved-ref: aa6400bbc85bf6ce953c4609d126796cdb4ca3c2
-      url: "git://github.com/deckerst/photo_view.git"
-    source: git
-    version: "0.9.2"
   platform:
     dependency: transitive
     description:
@@ -747,7 +738,7 @@ packages:
       name: printing
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.7.1"
+    version: "3.7.2"
   process:
     dependency: transitive
     description:
@@ -796,7 +787,7 @@ packages:
       name: rxdart
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.24.1"
+    version: "0.25.0"
   screen:
     dependency: "direct main"
     description:
@@ -866,7 +857,7 @@ packages:
       name: shelf_static
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.8"
+    version: "0.2.9+1"
   shelf_web_socket:
     dependency: transitive
     description:
@@ -1061,13 +1052,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.0.1+3"
-  utf:
-    dependency: transitive
-    description:
-      name: utf
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.9.0+5"
   uuid:
     dependency: transitive
     description:

pubspec.yaml

@@ -3,7 +3,7 @@ description: Aves is a gallery and metadata explorer app, built for Android.
 
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
-version: 1.2.9+35
+version: 1.3.0+36
 
 # brendan-duncan/image (as of v2.1.19):
 # - does not support TIFF with JPEG compression (issue #184)
@@ -70,10 +70,6 @@ dependencies:
   pedantic:
   percent_indicator:
   permission_handler:
-  photo_view:
-#    path: ../photo_view
-    git:
-      url: git://github.com/deckerst/photo_view.git
   printing:
   provider:
   screen:

whatsnew/whatsnew-en-US

@@ -1,7 +1,5 @@
 Thanks for using Aves!
-v1.2.9:
+v1.3.0:
-- identify 360 photos/videos, GeoTIFF
+- added quick scale (aka one finger zoom) gesture to the viewer
-- open panoramas (360 photos)
+- fixed zoom focus with double-tap or pinch-to-zoom gestures
-- open GImage/GAudio/GDepth media and thumbnails embedded in XMP
-- improved large TIFF handling
 Full changelog available on Github