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FIx issue #350 Semi-transparent outlines on raw, premultiplied input

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Nathan Gass 2020-01-28 14:18:01 +01:00
parent caa641c550
commit b7c384f1ee
1 changed files with 16 additions and 0 deletions
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16
src/serve_rendered.js
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@ -427,6 +427,22 @@ module.exports = (options, repo, params, id, publicUrl, dataResolver) => {
return;
}
// Fix semi-transparent outlines on raw, premultiplied input
// https://github.com/klokantech/tileserver-gl/issues/350#issuecomment-477857040
for (var i = 0; i < data.length; i += 4) {
var alpha = data[i + 3];
var norm = alpha / 255;
if (alpha === 0) {
data[i] = 0;
data[i + 1] = 0;
data[i + 2] = 0;
} else {
data[i] = data[i] / norm;
data[i + 1] = data[i + 1] / norm;
data[i + 2] = data[i + 2] / norm;
}
}
const image = sharp(data, {
raw: {
width: params.width * scale,