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Implement drawing an image from a CSS style value into a canvas.

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This commit is contained in:
Alan Jeffrey 2017-07-05 15:18:08 -05:00
parent 992c647f76
commit 2318caf002
8 changed files with 232 additions and 125 deletions
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28
components/layout/display_list_builder.rs
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@ -1173,7 +1173,6 @@ impl FragmentDisplayListBuilding for Fragment {
let device_pixel_ratio = state.layout_context.style_context.device_pixel_ratio();
let size_in_au = unbordered_box.size.to_physical(style.writing_mode);
let size_in_px = TypedSize2D::new(size_in_au.width.to_f32_px(), size_in_au.height.to_f32_px());
let size_in_dpx = size_in_px * device_pixel_ratio;
let name = paint_worklet.name.clone();
// Get the painter, and the computed values for its properties.
@ -1192,24 +1191,19 @@ impl FragmentDisplayListBuilding for Fragment {
// TODO: add a one-place cache to avoid drawing the paint image every time.
// https://github.com/servo/servo/issues/17369
debug!("Drawing a paint image {}({},{}).", name, size_in_px.width, size_in_px.height);
let (sender, receiver) = ipc::channel().unwrap();
painter.draw_a_paint_image(size_in_px, device_pixel_ratio, properties, sender);
// TODO: timeout
let webrender_image = match receiver.recv() {
Ok(CanvasData::Image(canvas_data)) => {
WebRenderImageInfo {
// TODO: it would be nice to get this data back from the canvas
width: size_in_dpx.width as u32,
height: size_in_dpx.height as u32,
format: PixelFormat::BGRA8,
key: Some(canvas_data.image_key),
}
},
Ok(CanvasData::WebGL(_)) => return warn!("Paint worklet generated WebGL."),
Err(err) => return warn!("Paint worklet recv generated error ({}).", err),
let mut draw_result = painter.draw_a_paint_image(size_in_px, device_pixel_ratio, properties);
let webrender_image = WebRenderImageInfo {
width: draw_result.width,
height: draw_result.height,
format: draw_result.format,
key: draw_result.image_key,
};
for url in draw_result.missing_image_urls.drain(..) {
debug!("Requesting missing image URL {}.", url);
state.layout_context.get_webrender_image_for_url(self.node, url, UsePlaceholder::No);
}
self.build_display_list_for_webrender_image(state,
style,
display_list_section,