Fix buffer size/offset calculations in rotate/processor.ts
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@ -11,7 +11,7 @@ export async function rotate(
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// Number of wasm memory pages (á 64KiB) needed to store the image twice.
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const bytesPerImage = data.width * data.height * 4;
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const numPagesNeeded = Math.ceil(bytesPerImage * 2 / (64 * 1024) + 4);
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const numPagesNeeded = Math.ceil((bytesPerImage * 2 + 4) / (64 * 1024));
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// Only count full pages, just to be safe.
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const numPagesAvailable = Math.floor(instance.exports.memory.buffer.byteLength / (64 * 1024));
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const additionalPagesToAllocate = numPagesNeeded - numPagesAvailable;
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@ -20,13 +20,13 @@ export async function rotate(
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instance.exports.memory.grow(additionalPagesToAllocate);
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}
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const view = new Uint8ClampedArray(instance.exports.memory.buffer);
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view.set(data.data);
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view.set(data.data, 4);
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instance.exports.rotate(data.width, data.height, opts.rotate);
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const flipDimensions = opts.rotate % 180 !== 0;
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return new ImageData(
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view.slice(bytesPerImage, bytesPerImage * 2),
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view.slice(bytesPerImage + 4, bytesPerImage * 2 + 4),
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flipDimensions ? data.height : data.width,
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flipDimensions ? data.width : data.height,
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);
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