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Propogate transformed clipping regions to nested flows.

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Fixes #10559
This commit is contained in:
Michael Howell 2016-04-13 11:36:21 -07:00
parent 6c9efbf383
commit 3c2210c5fc
5 changed files with 108 additions and 47 deletions
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47
components/layout/block.rs
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@ -48,13 +48,13 @@ use incremental::{BUBBLE_ISIZES, REFLOW, REFLOW_OUT_OF_FLOW, REPAINT};
use layout_debug;
use layout_thread::DISPLAY_PORT_SIZE_FACTOR;
use model::{CollapsibleMargins, MaybeAuto, specified, specified_or_none};
use model::{IntrinsicISizes, MarginCollapseInfo};
use model::{self, IntrinsicISizes, MarginCollapseInfo};
use rustc_serialize::{Encodable, Encoder};
use std::cmp::{max, min};
use std::fmt;
use std::sync::Arc;
use style::computed_values::{border_collapse, box_sizing, display, float, overflow_x, overflow_y};
use style::computed_values::{position, text_align, transform_style};
use style::computed_values::{position, text_align, transform, transform_style};
use style::context::StyleContext;
use style::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize, WritingMode};
use style::properties::{ComputedValues, ServoComputedValues};
@ -1965,7 +1965,48 @@ impl Flow for BlockFlow {
flow::mut_base(kid).late_absolute_position_info =
late_absolute_position_info_for_children;
flow::mut_base(kid).clip = clip.clone();
let clip = if kid.is_block_like() {
let mut clip = clip.clone();
let kid = kid.as_block();
// TODO(notriddle): To properly support transformations, we either need
// non-rectangular clipping regions in display lists, or clipping
// regions in terms of the parent coordinate system instead of the
// child coordinate system.
//
// This is a workaround for a common idiom of transform: translate().
if let Some(ref operations) = kid.fragment.style().get_effects().transform.0 {
for operation in operations {
match *operation {
transform::ComputedOperation::Translate(tx, ty, _) => {
// N.B. When the clipping value comes from us, it
// shouldn't be transformed.
let tx = if let overflow_x::T::hidden = kid.fragment.style().get_box()
.overflow_x {
Au(0)
} else {
model::specified(tx, kid.base.block_container_inline_size)
};
let ty = if let overflow_x::T::hidden = kid.fragment.style().get_box()
.overflow_y.0 {
Au(0)
} else {
model::specified(
ty,
kid.base.block_container_explicit_block_size.unwrap_or(Au(0))
)
};
let off = Point2D::new(tx, ty);
clip = clip.translate(&-off);
}
_ => {}
};
}
}
clip
} else {
clip.clone()
};
flow::mut_base(kid).clip = clip;
flow::mut_base(kid).stacking_relative_position_of_display_port =
stacking_relative_position_of_display_port_for_children;
}