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Switch to 8 byte offset

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Surma
2019-02-15 19:13:22 +01:00
parent 0d1e5ef119
commit a316120b69
3 changed files with 5 additions and 5 deletions
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6
src/codecs/rotate/processor.ts
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@@ -11,7 +11,7 @@ export async function rotate(
// Number of wasm memory pages (á 64KiB) needed to store the image twice.
const bytesPerImage = data.width * data.height * 4;
const numPagesNeeded = Math.ceil((bytesPerImage * 2 + 4) / (64 * 1024));
const numPagesNeeded = Math.ceil((bytesPerImage * 2 + 8) / (64 * 1024));
// Only count full pages, just to be safe.
const numPagesAvailable = Math.floor(instance.exports.memory.buffer.byteLength / (64 * 1024));
const additionalPagesToAllocate = numPagesNeeded - numPagesAvailable;
@@ -20,13 +20,13 @@ export async function rotate(
instance.exports.memory.grow(additionalPagesToAllocate);
}
const view = new Uint8ClampedArray(instance.exports.memory.buffer);
view.set(data.data, 4);
view.set(data.data, 8);
instance.exports.rotate(data.width, data.height, opts.rotate);
const flipDimensions = opts.rotate % 180 !== 0;
return new ImageData(
view.slice(bytesPerImage + 4, bytesPerImage * 2 + 4),
view.slice(bytesPerImage + 8, bytesPerImage * 2 + 8),
flipDimensions ? data.height : data.width,
flipDimensions ? data.width : data.height,
);