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gfx: Stop cloning clipping regions so much.

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Clipping regions can contain vectors and so can be expensive to copy.
This commit is contained in:
Patrick Walton 2016-03-02 11:50:21 -08:00
parent 983576ebaa
commit 940bff1f9c
5 changed files with 52 additions and 52 deletions
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72
components/layout/display_list_builder.rs
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@ -231,19 +231,17 @@ pub trait FragmentDisplayListBuilding {
clip: &ClippingRegion,
stacking_relative_display_port: &Rect<Au>);
/// Returns the appropriate clipping region for descendants of this fragment.
fn clipping_region_for_children(&self,
current_clip: &ClippingRegion,
stacking_relative_border_box: &Rect<Au>,
is_absolutely_positioned: bool)
-> ClippingRegion;
/// Adjusts the clipping region for descendants of this fragment as appropriate.
fn adjust_clipping_region_for_children(&self,
current_clip: &mut ClippingRegion,
stacking_relative_border_box: &Rect<Au>,
is_absolutely_positioned: bool);
/// Calculates the clipping rectangle for a fragment, taking the `clip` property into account
/// Adjusts the clipping rectangle for a fragment to take the `clip` property into account
/// per CSS 2.1 § 11.1.2.
fn calculate_style_specified_clip(&self,
parent_clip: &ClippingRegion,
stacking_relative_border_box: &Rect<Au>)
-> ClippingRegion;
fn adjust_clip_for_style(&self,
parent_clip: &mut ClippingRegion,
stacking_relative_border_box: &Rect<Au>);
/// Builds the display items necessary to paint the selection and/or caret for this fragment,
/// if any.
@ -481,7 +479,8 @@ impl FragmentDisplayListBuilding for Fragment {
// Clip.
//
// TODO: Check the bounds to see if a clip item is actually required.
let clip = clip.clone().intersect_rect(&bounds);
let mut clip = clip.clone();
clip.intersect_rect(&bounds);
// Background image should be positioned on the padding box basis.
let border = style.logical_border_width().to_physical(style.writing_mode);
@ -580,7 +579,8 @@ impl FragmentDisplayListBuilding for Fragment {
clip: &ClippingRegion,
gradient: &LinearGradient,
style: &ComputedValues) {
let clip = clip.clone().intersect_rect(absolute_bounds);
let mut clip = clip.clone();
clip.intersect_rect(absolute_bounds);
// This is the distance between the center and the ending point; i.e. half of the distance
// between the starting point and the ending point.
@ -893,15 +893,14 @@ impl FragmentDisplayListBuilding for Fragment {
}), DisplayListSection::Content);
}
fn calculate_style_specified_clip(&self,
parent_clip: &ClippingRegion,
stacking_relative_border_box: &Rect<Au>)
-> ClippingRegion {
fn adjust_clip_for_style(&self,
parent_clip: &mut ClippingRegion,
stacking_relative_border_box: &Rect<Au>) {
// Account for `clip` per CSS 2.1 § 11.1.2.
let style_clip_rect = match (self.style().get_box().position,
self.style().get_effects().clip.0) {
(position::T::absolute, Some(style_clip_rect)) => style_clip_rect,
_ => return (*parent_clip).clone(),
_ => return,
};
// FIXME(pcwalton, #2795): Get the real container size.
@ -910,7 +909,7 @@ impl FragmentDisplayListBuilding for Fragment {
let right = style_clip_rect.right.unwrap_or(stacking_relative_border_box.size.width);
let bottom = style_clip_rect.bottom.unwrap_or(stacking_relative_border_box.size.height);
let clip_size = Size2D::new(right - clip_origin.x, bottom - clip_origin.y);
(*parent_clip).clone().intersect_rect(&Rect::new(clip_origin, clip_size))
parent_clip.intersect_rect(&Rect::new(clip_origin, clip_size))
}
fn build_display_items_for_selection_if_necessary(&self,
@ -995,7 +994,8 @@ impl FragmentDisplayListBuilding for Fragment {
// Calculate the clip rect. If there's nothing to render at all, don't even construct
// display list items.
let clip = self.calculate_style_specified_clip(clip, &stacking_relative_border_box);
let mut clip = (*clip).clone();
self.adjust_clip_for_style(&mut clip, &stacking_relative_border_box);
if !clip.might_intersect_rect(&stacking_relative_border_box) {
return;
}
@ -1424,19 +1424,17 @@ impl FragmentDisplayListBuilding for Fragment {
layer_info))
}
fn clipping_region_for_children(&self,
current_clip: &ClippingRegion,
stacking_relative_border_box: &Rect<Au>,
is_absolutely_positioned: bool)
-> ClippingRegion {
fn adjust_clipping_region_for_children(&self,
current_clip: &mut ClippingRegion,
stacking_relative_border_box: &Rect<Au>,
is_absolutely_positioned: bool) {
// Don't clip if we're text.
if self.is_scanned_text_fragment() {
return (*current_clip).clone()
return
}
// Account for style-specified `clip`.
let mut current_clip = self.calculate_style_specified_clip(current_clip,
stacking_relative_border_box);
self.adjust_clip_for_style(current_clip, stacking_relative_border_box);
// Clip according to the values of `overflow-x` and `overflow-y`.
//
@ -1452,7 +1450,7 @@ impl FragmentDisplayListBuilding for Fragment {
let max_x = cmp::min(bounds.max_x(), stacking_relative_border_box.max_x());
bounds.origin.x = cmp::max(bounds.origin.x, stacking_relative_border_box.origin.x);
bounds.size.width = max_x - bounds.origin.x;
current_clip = current_clip.intersect_rect(&bounds)
current_clip.intersect_rect(&bounds)
}
_ => {}
}
@ -1464,12 +1462,10 @@ impl FragmentDisplayListBuilding for Fragment {
let max_y = cmp::min(bounds.max_y(), stacking_relative_border_box.max_y());
bounds.origin.y = cmp::max(bounds.origin.y, stacking_relative_border_box.origin.y);
bounds.size.height = max_y - bounds.origin.y;
current_clip = current_clip.intersect_rect(&bounds)
current_clip.intersect_rect(&bounds)
}
_ => {}
}
current_clip
}
fn build_display_list_for_text_fragment(&self,
@ -1715,10 +1711,14 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
};
// Add the box that starts the block context.
let clip = if self.fragment.establishes_stacking_context() {
self.base.clip.translate(&-self.base.stacking_relative_position)
let translated_clip = if self.fragment.establishes_stacking_context() {
Some(self.base.clip.translate(&-self.base.stacking_relative_position))
} else {
self.base.clip.clone()
None
};
let clip = match translated_clip {
Some(ref translated_clip) => translated_clip,
None => &self.base.clip,
};
self.fragment
@ -1732,7 +1732,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
.relative_containing_block_mode,
border_painting_mode,
background_border_section,
&clip,
clip,
&self.base.stacking_relative_position_of_display_port);
// Add children.