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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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4
codecs/rotate/rotate.rs
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@@ -22,8 +22,8 @@ fn rotate(width: usize, height: usize, _rotate: usize) {
let in_b: &mut [u32]; let in_b: &mut [u32];
let out_b: &mut [u32]; let out_b: &mut [u32];
unsafe { unsafe {
in_b = from_raw_parts_mut::<u32>(4 as *mut u32, num_pixels); in_b = from_raw_parts_mut::<u32>(8 as *mut u32, num_pixels);
out_b = from_raw_parts_mut::<u32>((num_pixels * 4 + 4) as *mut u32, num_pixels); out_b = from_raw_parts_mut::<u32>((num_pixels * 4 + 8) as *mut u32, num_pixels);
} }
let new_width = height; let new_width = height;

BIN
codecs/rotate/rotate.wasm
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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. // Number of wasm memory pages (á 64KiB) needed to store the image twice.
const bytesPerImage = data.width * data.height * 4; 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. // Only count full pages, just to be safe.
const numPagesAvailable = Math.floor(instance.exports.memory.buffer.byteLength / (64 * 1024)); const numPagesAvailable = Math.floor(instance.exports.memory.buffer.byteLength / (64 * 1024));
const additionalPagesToAllocate = numPagesNeeded - numPagesAvailable; const additionalPagesToAllocate = numPagesNeeded - numPagesAvailable;
@@ -20,13 +20,13 @@ export async function rotate(
instance.exports.memory.grow(additionalPagesToAllocate); instance.exports.memory.grow(additionalPagesToAllocate);
} }
const view = new Uint8ClampedArray(instance.exports.memory.buffer); 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); instance.exports.rotate(data.width, data.height, opts.rotate);
const flipDimensions = opts.rotate % 180 !== 0; const flipDimensions = opts.rotate % 180 !== 0;
return new ImageData( return new ImageData(
view.slice(bytesPerImage + 4, bytesPerImage * 2 + 4), view.slice(bytesPerImage + 8, bytesPerImage * 2 + 8),
flipDimensions ? data.height : data.width, flipDimensions ? data.height : data.width,
flipDimensions ? data.width : data.height, flipDimensions ? data.width : data.height,
); );