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Fix GIF flickering on small palette models

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JannisX11 2023-04-11 20:52:42 +02:00
parent c11841d73e
commit 0dd815bbc3
1 changed files with 42 additions and 2 deletions
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44
js/preview/screenshot.js
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@ -378,10 +378,50 @@ const Screencam = {
if (options.format == 'gif') {
let i = 0;
let format = 'rgb4444';
function quantize(data) {
let palette = [[0, 0, 0]];
for (let i = 0; i < data.length; i += 4) {
if (data[i+3] < 127) {
continue;
}
let r = data[i];
let g = data[i+1];
let b = data[i+2];
let match = palette.findIndex(color => color[0] == r && color[1] == g && color[2] == b);
if (match == -1) {
palette.push([r, g, b])
}
if (palette.length > 256) break;
}
return palette;
}
function applyPalette(data, palette) {
let array = new Uint8Array(data.length / 4);
for (let i = 0; i < array.length; i++) {
if (data[i*4+3] < 127) {
array[i] = 0; continue;
}
let r = data[i*4];
let g = data[i*4+1];
let b = data[i*4+2];
let match = palette.findIndex(color => color[0] == r && color[1] == g && color[2] == b);
if (match == -1) {match = 0;}
array[i] = match;
}
return array;
}
for (let canvas of frame_canvases) {
let data = canvas.getContext('2d').getImageData(0, 0, canvas.width, canvas.height).data;
let palette = GIFEnc.quantize(data, 256, {format, oneBitAlpha: true});
let index = GIFEnc.applyPalette(data, palette, format);
let palette = quantize(data, 256, {format, oneBitAlpha: true});
let index;
if (palette.length > 256) {
// Built-in methods
palette = GIFEnc.quantize(data, 256, {format, oneBitAlpha: true});
index = GIFEnc.applyPalette(data, palette, format);
} else {
// Direct flicker-free color mapping
index = applyPalette(data, palette, format);
}
gif.writeFrame(index, canvas.width, canvas.height, {palette, delay: interval, transparent: true});
i++;
Blockbench.setProgress(i / frame_canvases.length);