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layout: Implement opacity per CSS-COLOR § 3.2.
This adds the infrastructure necessary to support stacking contexts that are not containing blocks for absolutely-positioned elements. Our infrastructure did not support that before. This minor revamp actually ended up simplifying the logic around display list building and stacking-relative position computation for absolutely-positioned flows, which was nice.
This commit is contained in:
Patrick Walton
parent
873ca6cadd
commit
1c1c507c03
17 changed files with 421 additions and 146 deletions
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@ -146,6 +146,8 @@ pub struct StackingContext {
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pub clip_rect: Rect<Au>,
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/// The `z-index` for this stacking context.
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pub z_index: i32,
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/// The opacity of this stacking context.
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pub opacity: AzFloat,
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}
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impl StackingContext {
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@ -157,6 +159,7 @@ impl StackingContext {
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pub fn new(display_list: Box<DisplayList>,
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bounds: Rect<Au>,
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z_index: i32,
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opacity: AzFloat,
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layer: Option<Arc<RenderLayer>>)
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-> StackingContext {
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StackingContext {
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@ -165,6 +168,7 @@ impl StackingContext {
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bounds: bounds,
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clip_rect: bounds,
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z_index: z_index,
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opacity: opacity,
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}
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}
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@ -174,82 +178,107 @@ impl StackingContext {
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tile_bounds: &Rect<AzFloat>,
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current_transform: &Matrix2D<AzFloat>,
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current_clip_stack: &mut Vec<Rect<Au>>) {
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// Optimize the display list to throw out out-of-bounds display items and so forth.
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let display_list = DisplayListOptimizer::new(tile_bounds).optimize(&*self.display_list);
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let temporary_draw_target =
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render_context.get_or_create_temporary_draw_target(self.opacity);
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{
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let mut render_subcontext = RenderContext {
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draw_target: temporary_draw_target.clone(),
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font_ctx: &mut *render_context.font_ctx,
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page_rect: render_context.page_rect,
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screen_rect: render_context.screen_rect,
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..*render_context
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};
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// Sort positioned children according to z-index.
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let mut positioned_children = SmallVec8::new();
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for kid in display_list.children.iter() {
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positioned_children.push((*kid).clone());
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}
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positioned_children.as_slice_mut().sort_by(|this, other| this.z_index.cmp(&other.z_index));
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// Optimize the display list to throw out out-of-bounds display items and so forth.
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let display_list =
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DisplayListOptimizer::new(tile_bounds).optimize(&*self.display_list);
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// Steps 1 and 2: Borders and background for the root.
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for display_item in display_list.background_and_borders.iter() {
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display_item.draw_into_context(render_context, current_transform, current_clip_stack)
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}
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// Step 3: Positioned descendants with negative z-indices.
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for positioned_kid in positioned_children.iter() {
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if positioned_kid.z_index >= 0 {
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break
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// Sort positioned children according to z-index.
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let mut positioned_children = SmallVec8::new();
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for kid in display_list.children.iter() {
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positioned_children.push((*kid).clone());
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}
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if positioned_kid.layer.is_none() {
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let new_transform =
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current_transform.translate(positioned_kid.bounds.origin.x.to_nearest_px()
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as AzFloat,
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positioned_kid.bounds.origin.y.to_nearest_px()
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as AzFloat);
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let new_tile_rect =
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self.compute_tile_rect_for_child_stacking_context(tile_bounds,
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&**positioned_kid);
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positioned_kid.optimize_and_draw_into_context(render_context,
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&new_tile_rect,
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&new_transform,
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current_clip_stack);
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}
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}
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positioned_children.as_slice_mut()
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.sort_by(|this, other| this.z_index.cmp(&other.z_index));
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// Step 4: Block backgrounds and borders.
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for display_item in display_list.block_backgrounds_and_borders.iter() {
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display_item.draw_into_context(render_context, current_transform, current_clip_stack)
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}
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// Step 5: Floats.
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for display_item in display_list.floats.iter() {
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display_item.draw_into_context(render_context, current_transform, current_clip_stack)
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}
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// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.
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// Step 7: Content.
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for display_item in display_list.content.iter() {
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display_item.draw_into_context(render_context, current_transform, current_clip_stack)
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}
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// Steps 8 and 9: Positioned descendants with nonnegative z-indices.
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for positioned_kid in positioned_children.iter() {
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if positioned_kid.z_index < 0 {
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continue
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// Steps 1 and 2: Borders and background for the root.
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for display_item in display_list.background_and_borders.iter() {
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display_item.draw_into_context(&mut render_subcontext,
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current_transform,
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current_clip_stack)
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}
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if positioned_kid.layer.is_none() {
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let new_transform =
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current_transform.translate(positioned_kid.bounds.origin.x.to_nearest_px()
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as AzFloat,
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positioned_kid.bounds.origin.y.to_nearest_px()
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as AzFloat);
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let new_tile_rect =
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self.compute_tile_rect_for_child_stacking_context(tile_bounds,
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&**positioned_kid);
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positioned_kid.optimize_and_draw_into_context(render_context,
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&new_tile_rect,
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&new_transform,
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current_clip_stack);
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// Step 3: Positioned descendants with negative z-indices.
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for positioned_kid in positioned_children.iter() {
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if positioned_kid.z_index >= 0 {
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break
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}
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if positioned_kid.layer.is_none() {
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let new_transform =
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current_transform.translate(positioned_kid.bounds.origin.x.to_nearest_px()
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as AzFloat,
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positioned_kid.bounds.origin.y.to_nearest_px()
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as AzFloat);
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let new_tile_rect =
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self.compute_tile_rect_for_child_stacking_context(tile_bounds,
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&**positioned_kid);
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positioned_kid.optimize_and_draw_into_context(&mut render_subcontext,
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&new_tile_rect,
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&new_transform,
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current_clip_stack);
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}
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}
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// Step 4: Block backgrounds and borders.
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for display_item in display_list.block_backgrounds_and_borders.iter() {
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display_item.draw_into_context(&mut render_subcontext,
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current_transform,
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current_clip_stack)
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}
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// Step 5: Floats.
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for display_item in display_list.floats.iter() {
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display_item.draw_into_context(&mut render_subcontext,
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current_transform,
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current_clip_stack)
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}
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// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.
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// Step 7: Content.
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for display_item in display_list.content.iter() {
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display_item.draw_into_context(&mut render_subcontext,
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current_transform,
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current_clip_stack)
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}
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// Steps 8 and 9: Positioned descendants with nonnegative z-indices.
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for positioned_kid in positioned_children.iter() {
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if positioned_kid.z_index < 0 {
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continue
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}
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if positioned_kid.layer.is_none() {
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let new_transform =
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current_transform.translate(positioned_kid.bounds.origin.x.to_nearest_px()
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as AzFloat,
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positioned_kid.bounds.origin.y.to_nearest_px()
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as AzFloat);
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let new_tile_rect =
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self.compute_tile_rect_for_child_stacking_context(tile_bounds,
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&**positioned_kid);
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positioned_kid.optimize_and_draw_into_context(&mut render_subcontext,
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&new_tile_rect,
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&new_transform,
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current_clip_stack);
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}
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}
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// TODO(pcwalton): Step 10: Outlines.
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}
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// TODO(pcwalton): Step 10: Outlines.
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render_context.draw_temporary_draw_target_if_necessary(&temporary_draw_target,
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self.opacity)
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}
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/// Translate the given tile rect into the coordinate system of a child stacking context.
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