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Merge pull request #458 from jviide/rust-rotate

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Fix buffer offset/size calculations in rotate/processor.ts
This commit is contained in:
Surma
2019-02-11 22:42:07 +00:00
committed by GitHub
parent ece3fa12b4 9ed3b4f11e
commit e086f64779
1 changed files with 3 additions and 3 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 / (64 * 1024) + 4);
const numPagesNeeded = Math.ceil((bytesPerImage * 2 + 4) / (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);
view.set(data.data, 4);
instance.exports.rotate(data.width, data.height, opts.rotate);
const flipDimensions = opts.rotate % 180 !== 0;
return new ImageData(
view.slice(bytesPerImage, bytesPerImage * 2),
view.slice(bytesPerImage + 4, bytesPerImage * 2 + 4),
flipDimensions ? data.height : data.width,
flipDimensions ? data.width : data.height,
);