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layout: Implement 2D CSS transforms per CSS-TRANSFORMS § 5, 6, 7, and 8.

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Patrick Walton 2014-12-31 14:08:08 -05:00
parent 7bd6cb0091
commit d10627a2b3
14 changed files with 964 additions and 35 deletions
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20
components/gfx/display_list/mod.rs
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@ -214,18 +214,28 @@ impl SizeOf for DisplayList {
pub struct StackingContext {
/// The display items that make up this stacking context.
pub display_list: Box<DisplayList>,
/// The layer for this stacking context, if there is one.
pub layer: Option<Arc<PaintLayer>>,
/// The position and size of this stacking context.
pub bounds: Rect<Au>,
/// The overflow rect for this stacking context in its coordinate system.
pub overflow: Rect<Au>,
/// The `z-index` for this stacking context.
pub z_index: i32,
/// CSS filters to be applied to this stacking context (including opacity).
pub filters: filter::T,
/// The blend mode with which this stacking context blends with its backdrop.
pub blend_mode: mix_blend_mode::T,
/// A transform to be applied to this stacking context.
///
/// TODO(pcwalton): 3D transforms.
pub transform: Matrix2D<AzFloat>,
}
impl StackingContext {
@ -235,6 +245,7 @@ impl StackingContext {
bounds: &Rect<Au>,
overflow: &Rect<Au>,
z_index: i32,
transform: &Matrix2D<AzFloat>,
filters: filter::T,
blend_mode: mix_blend_mode::T,
layer: Option<Arc<PaintLayer>>)
@ -245,6 +256,7 @@ impl StackingContext {
bounds: *bounds,
overflow: *overflow,
z_index: z_index,
transform: *transform,
filters: filters,
blend_mode: blend_mode,
}
@ -256,6 +268,7 @@ impl StackingContext {
tile_bounds: &Rect<AzFloat>,
transform: &Matrix2D<AzFloat>,
clip_rect: Option<&Rect<Au>>) {
let transform = transform.mul(&self.transform);
let temporary_draw_target =
paint_context.get_or_create_temporary_draw_target(&self.filters, self.blend_mode);
{
@ -282,7 +295,7 @@ impl StackingContext {
// Set up our clip rect and transform.
let old_transform = paint_subcontext.draw_target.get_transform();
paint_subcontext.draw_target.set_transform(transform);
paint_subcontext.draw_target.set_transform(&transform);
paint_subcontext.push_clip_if_applicable();
// Steps 1 and 2: Borders and background for the root.
@ -408,7 +421,7 @@ impl StackingContext {
/// the `pointer-events` CSS property If `topmost_only` is true, stops after placing one node
/// into the list. `result` must be empty upon entry to this function.
pub fn hit_test(&self,
point: Point2D<Au>,
mut point: Point2D<Au>,
result: &mut Vec<DisplayItemMetadata>,
topmost_only: bool) {
fn hit_test_in_list<'a,I>(point: Point2D<Au>,
@ -459,6 +472,9 @@ impl StackingContext {
}
debug_assert!(!topmost_only || result.is_empty());
let frac_point = self.transform.transform_point(&Point2D(point.x.to_frac32_px(),
point.y.to_frac32_px()));
point = Point2D(Au::from_frac32_px(frac_point.x), Au::from_frac32_px(frac_point.y));
// Iterate through display items in reverse stacking order. Steps here refer to the
// painting steps in CSS 2.1 Appendix E.