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canvas: Make pixel obtaining methods take &mut GenericDrawTarget (#38264)

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This will be needed for vello_cpu. While we could wrap it in RefCell for
inner mut, but that would be less ergonomic and performant.

Testing: Just refactoring, but the code is covered by WPT tests.

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
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sagudev 2025-07-25 15:22:41 +02:00 • committed by GitHub
parent 9d29017c0d
commit fc0038743d
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3 changed files with 10 additions and 8 deletions
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4
components/canvas/canvas_data.rs
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@ -116,7 +116,7 @@ impl<DrawTarget: GenericDrawTarget> CanvasData<DrawTarget> {
font_context: Arc<FontContext>,
) -> CanvasData<DrawTarget> {
let size = size.max(MIN_WR_IMAGE_SIZE);
let draw_target = DrawTarget::new(size.cast());
let mut draw_target = DrawTarget::new(size.cast());
let image_key = compositor_api.generate_image_key_blocking().unwrap();
let (descriptor, data) = draw_target.image_descriptor_and_serializable_data();
compositor_api.add_image(image_key, descriptor, data);
@ -724,7 +724,7 @@ impl<DrawTarget: GenericDrawTarget> CanvasData<DrawTarget> {
/// read_rect: The area of the canvas we want to read from
#[allow(unsafe_code)]
pub(crate) fn read_pixels(
&self,
&mut self,
read_rect: Option<Rect<u32>>,
canvas_size: Option<Size2D<u32>>,
) -> Snapshot {