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perf(hdr): reduce layered composite overhead (#538)

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This commit is contained in:
Vance Ingalls
2026-04-28 15:30:35 -07:00
committed by GitHub
parent fc3c601870
commit ad44c3133a
3 changed files with 362 additions and 62 deletions
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packages/engine/src/utils/alphaBlit.test.ts
+19
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@@ -775,6 +775,25 @@ describe("blitRgb48leRegion", () => {
expect(canvas.readUInt16LE(0)).toBe(20000);
});
it("blends opacity over existing destination pixels", () => {
const canvas = makeHdrFrame(2, 1, 10000, 20000, 30000);
const source = makeHdrFrame(2, 1, 50000, 10000, 60000);
blitRgb48leRegion(canvas, source, 0, 0, 2, 1, 2, 1, 0.25);
expect(canvas.readUInt16LE(0)).toBe(20000);
expect(canvas.readUInt16LE(2)).toBe(17500);
expect(canvas.readUInt16LE(4)).toBe(37500);
expect(canvas.readUInt16LE(6)).toBe(20000);
});
it("skips exact-zero opacity without mutating the destination", () => {
const canvas = makeHdrFrame(1, 1, 10000, 20000, 30000);
const source = makeHdrFrame(1, 1, 50000, 50000, 50000);
blitRgb48leRegion(canvas, source, 0, 0, 1, 1, 1, 1, 0);
expect(canvas.readUInt16LE(0)).toBe(10000);
expect(canvas.readUInt16LE(2)).toBe(20000);
expect(canvas.readUInt16LE(4)).toBe(30000);
});
it("no-op for zero-size region", () => {
const canvas = Buffer.alloc(4 * 4 * 6);
const source = makeHdrFrame(2, 2, 10000, 20000, 30000);