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Merge byte swap and unmultiplying loops in ctx.getImageData()

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This commit is contained in:
Anthony Ramine 2018-09-13 16:12:47 +02:00
parent 983a914da3
commit b5c469d52e
2 changed files with 6 additions and 10 deletions
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6
components/canvas/canvas_data.rs
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@ -458,11 +458,7 @@ impl<'a> CanvasData<'a> {
canvas_size: Size2D<f64>,
chan: IpcSender<ByteBuf>,
) {
let mut dest_data = self.read_pixels(dest_rect, canvas_size);
// bgra -> rgba
byte_swap(&mut dest_data);
chan.send(dest_data.into()).unwrap();
chan.send(self.read_pixels(dest_rect, canvas_size).into()).unwrap();
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-putimagedata

10
components/script/dom/canvasrenderingcontext2d.rs
View file

@ -1115,12 +1115,12 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
self.send_canvas_2d_msg(Canvas2dMsg::GetImageData(dest_rect, canvas_size, sender));
let mut data = receiver.recv().unwrap();
// Un-premultiply alpha
// Byte swap and unmultiply alpha.
for chunk in data.chunks_mut(4) {
let alpha = chunk[3] as usize;
chunk[0] = UNPREMULTIPLY_TABLE[256 * alpha + chunk[0] as usize];
chunk[1] = UNPREMULTIPLY_TABLE[256 * alpha + chunk[1] as usize];
chunk[2] = UNPREMULTIPLY_TABLE[256 * alpha + chunk[2] as usize];
let (b, g, r, a) = (chunk[0], chunk[1], chunk[2], chunk[3]);
chunk[0] = UNPREMULTIPLY_TABLE[256 * (a as usize) + r as usize];
chunk[1] = UNPREMULTIPLY_TABLE[256 * (a as usize) + g as usize];
chunk[2] = UNPREMULTIPLY_TABLE[256 * (a as usize) + b as usize];
}
ImageData::new(&self.global(), sw, sh, Some(data.to_vec()))