Ku6epXBOCTuK/easy-png-tools2
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feat: add show mask chip for tools

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Ku6epXBOCTuK
2026-10-09 14:09:51 +05:00
parent a51e224d02
commit c22c6e5574
22 changed files with 521 additions and 30 deletions
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web/src/lib/core/masks.ts
+24
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@@ -117,6 +117,30 @@ export function extractByColor(
return out;
}
/**
* Pixels that differ between before/after become white, the rest black.
* Size mismatch (crop/trim) means everything changed: all white.
*/
export function diffMask(before: PixelImage, after: PixelImage): PixelImage {
const out = createPixelImage(before.width, before.height);
const sameSize =
before.width === after.width && before.height === after.height;
for (let i = 0; i < out.data.length; i += 4) {
const changed =
!sameSize ||
before.data[i] !== after.data[i] ||
before.data[i + 1] !== after.data[i + 1] ||
before.data[i + 2] !== after.data[i + 2] ||
before.data[i + 3] !== after.data[i + 3];
const v = changed ? 255 : 0;
out.data[i] = v;
out.data[i + 1] = v;
out.data[i + 2] = v;
out.data[i + 3] = 255;
}
return out;
}
/**
* Counts color frequencies and returns a predicate "occurs at most limit times".
*/