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Merge pull request #21427 from Snuffleupagus/putBinaryImageData-convertBlackAndWhiteToRGBA

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Use the `convertBlackAndWhiteToRGBA` helper with grayscale images in `putBinaryImageData`
This commit is contained in:
Jonas Jenwald 2026-06-10 21:23:03 +02:00 committed by GitHub
commit ac64bcfa2b
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GPG Key ID: B5690EEEBB952194
2 changed files with 15 additions and 39 deletions
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46
src/display/canvas.js
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@ -349,48 +349,16 @@ function putBinaryImageData(ctx, imgData) {
// imgData.kind tells us which one this is.
if (imgData.kind === ImageKind.GRAYSCALE_1BPP) {
// Grayscale, 1 bit per pixel (i.e. black-and-white).
const srcLength = src.byteLength;
const dest32 = new Uint32Array(dest.buffer, 0, dest.byteLength >> 2);
const dest32DataLength = dest32.length;
const fullSrcDiff = (width + 7) >> 3;
const white = 0xffffffff;
const black = FeatureTest.isLittleEndian ? 0xff000000 : 0x000000ff;
for (i = 0; i < totalChunks; i++) {
thisChunkHeight = i < fullChunks ? FULL_CHUNK_HEIGHT : partialChunkHeight;
destPos = 0;
for (j = 0; j < thisChunkHeight; j++) {
const srcDiff = srcLength - srcPos;
let k = 0;
const kEnd = srcDiff > fullSrcDiff ? width : srcDiff * 8 - 7;
const kEndUnrolled = kEnd & ~7;
let mask = 0;
let srcByte = 0;
for (; k < kEndUnrolled; k += 8) {
srcByte = src[srcPos++];
dest32[destPos++] = srcByte & 128 ? white : black;
dest32[destPos++] = srcByte & 64 ? white : black;
dest32[destPos++] = srcByte & 32 ? white : black;
dest32[destPos++] = srcByte & 16 ? white : black;
dest32[destPos++] = srcByte & 8 ? white : black;
dest32[destPos++] = srcByte & 4 ? white : black;
dest32[destPos++] = srcByte & 2 ? white : black;
dest32[destPos++] = srcByte & 1 ? white : black;
}
for (; k < kEnd; k++) {
if (mask === 0) {
srcByte = src[srcPos++];
mask = 128;
}
dest32[destPos++] = srcByte & mask ? white : black;
mask >>= 1;
}
}
// We ran out of input. Make all remaining pixels transparent.
while (destPos < dest32DataLength) {
dest32[destPos++] = 0;
}
({ srcPos } = convertBlackAndWhiteToRGBA({
src,
srcPos,
dest,
width,
height: thisChunkHeight,
}));
ctx.putImageData(chunkImgData, 0, i * FULL_CHUNK_HEIGHT);
}

8
test/test_manifest.json
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@ -5389,6 +5389,14 @@
"rounds": 1,
"type": "eq"
},
{
"id": "images_1bit_grayscale-disable-isOffscreenCanvasSupported",
"file": "pdfs/images_1bit_grayscale.pdf",
"md5": "e1c36a19563944891bd30cfc0199d07f",
"rounds": 1,
"type": "eq",
"isOffscreenCanvasSupported": false
},
{
"id": "html5checker",
"file": "pdfs/html5checker.pdf",