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Simplify ctx.drawImage a bit

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There is no need to swap between RGBA and BGRA twice.
This commit is contained in:
Anthony Ramine 2018-10-11 15:46:42 +02:00
parent 35bf180dcb
commit bb2101f540
2 changed files with 9 additions and 36 deletions
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33
components/script/dom/canvasrenderingcontext2d.rs
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@ -403,39 +403,16 @@ impl CanvasRenderingContext2D {
dh: Option<f64>,
) -> ErrorResult {
debug!("Fetching image {}.", url);
// https://html.spec.whatwg.org/multipage/#img-error
// If the image argument is an HTMLImageElement object that is in the broken state,
// then throw an InvalidStateError exception
let (image_data, image_size) = match self.fetch_image_data(url) {
Some((mut data, size)) => {
// Pixels come from cache in BGRA order and drawImage expects RGBA so we
// have to swap the color values
pixels::byte_swap_and_premultiply_inplace(&mut data);
let size = Size2D::new(size.width as f64, size.height as f64);
(data, size)
},
None => return Err(Error::InvalidState),
};
let (mut image_data, image_size) =
self.fetch_image_data(url).ok_or(Error::InvalidState)?;
pixels::premultiply_inplace(&mut image_data);
let image_size = image_size.to_f64();
let dw = dw.unwrap_or(image_size.width);
let dh = dh.unwrap_or(image_size.height);
let sw = sw.unwrap_or(image_size.width);
let sh = sh.unwrap_or(image_size.height);
self.draw_image_data(image_data, image_size, sx, sy, sw, sh, dx, dy, dw, dh)
}
fn draw_image_data(
&self,
image_data: Vec<u8>,
image_size: Size2D<f64>,
sx: f64,
sy: f64,
sw: f64,
sh: f64,
dx: f64,
dy: f64,
dw: f64,
dh: f64,
) -> ErrorResult {
// Establish the source and destination rectangles
let (source_rect, dest_rect) =
self.adjust_source_dest_rects(image_size, sx, sy, sw, sh, dx, dy, dw, dh);