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Support transforms for display list optimization. Prevents clipping in #6643.

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This commit is contained in:
Glenn Watson 2015-08-05 11:33:08 +10:00
parent b9f00190e1
commit 11b1c19b05
7 changed files with 134 additions and 91 deletions
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25
components/gfx/display_list/optimizer.rs
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@ -8,6 +8,7 @@ use display_list::{DisplayItem, DisplayList, StackingContext};
use std::collections::linked_list::LinkedList;
use euclid::rect::Rect;
use euclid::{Matrix2D, Matrix4};
use util::geometry::{self, Au};
use std::sync::Arc;
@ -62,9 +63,27 @@ impl DisplayListOptimizer {
stacking_contexts: I)
where I: Iterator<Item=&'a Arc<StackingContext>> {
for stacking_context in stacking_contexts {
let overflow = stacking_context.overflow.translate(&stacking_context.bounds.origin);
if self.visible_rect.intersects(&overflow) {
result_list.push_back((*stacking_context).clone())
if stacking_context.layer.is_none() {
// Transform this stacking context to get it into the same space as
// the parent stacking context.
let origin_x = stacking_context.bounds.origin.x.to_f32_px();
let origin_y = stacking_context.bounds.origin.y.to_f32_px();
let transform = Matrix4::identity().translate(origin_x,
origin_y,
0.0)
.mul(&stacking_context.transform);
let transform_2d = Matrix2D::new(transform.m11, transform.m12,
transform.m21, transform.m22,
transform.m41, transform.m42);
let overflow = geometry::au_rect_to_f32_rect(stacking_context.overflow);
let overflow = transform_2d.transform_rect(&overflow);
let overflow = geometry::f32_rect_to_au_rect(overflow);
if self.visible_rect.intersects(&overflow) {
result_list.push_back((*stacking_context).clone())
}
}
}
}