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gfx: Make display lists serializable using serde.

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This commit introduces the `serde` dependency, which we will use to
serialize messages going between processes in multiprocess Servo.

This also adds a new debugging flag, `-Z print-display-list-json`,
allowing the output of display list serialization to be visualized.
This will be useful for our experiments with alternate rasterizers.
This commit is contained in:
Patrick Walton 2015-07-08 16:15:23 -07:00
parent b6b95085fb
commit 6eacb0c995
30 changed files with 320 additions and 124 deletions
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28
components/gfx/paint_task.rs
View file

@ -40,7 +40,7 @@ use util::task_state;
use util::task::spawn_named;
/// Information about a hardware graphics layer that layout sends to the painting task.
#[derive(Clone)]
#[derive(Clone, Deserialize, Serialize)]
pub struct PaintLayer {
/// A per-pipeline ID describing this layer that should be stable across reflows.
pub id: LayerId,
@ -353,18 +353,23 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
let transform = transform.mul(&stacking_context.transform);
let perspective = perspective.mul(&stacking_context.perspective);
let (next_parent_id, page_position, transform, perspective) = match stacking_context.layer {
let (next_parent_id, page_position, transform, perspective) =
match stacking_context.layer {
Some(ref paint_layer) => {
// Layers start at the top left of their overflow rect, as far as the info we give to
// the compositor is concerned.
// Layers start at the top left of their overflow rect, as far as the info we
// give to the compositor is concerned.
let overflow_relative_page_position = *page_position +
stacking_context.bounds.origin +
stacking_context.overflow.origin;
let layer_position =
Rect::new(Point2D::new(overflow_relative_page_position.x.to_nearest_px() as f32,
overflow_relative_page_position.y.to_nearest_px() as f32),
Size2D::new(stacking_context.overflow.size.width.to_nearest_px() as f32,
stacking_context.overflow.size.height.to_nearest_px() as f32));
Rect::new(Point2D::new(overflow_relative_page_position.x.to_nearest_px() as
f32,
overflow_relative_page_position.y.to_nearest_px() as
f32),
Size2D::new(stacking_context.overflow.size.width.to_nearest_px()
as f32,
stacking_context.overflow.size.height.to_nearest_px()
as f32));
let establishes_3d_context = stacking_context.establishes_3d_context;
@ -395,12 +400,7 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
};
for kid in stacking_context.display_list.children.iter() {
build(properties,
&**kid,
&page_position,
&transform,
&perspective,
next_parent_id);
build(properties, &**kid, &page_position, &transform, &perspective, next_parent_id)
}
}
}