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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/paint/compositing/compositing_layer_property_updater.h"
#include "third_party/blink/renderer/core/layout/layout_box_model_object.h"
#include "third_party/blink/renderer/core/paint/compositing/composited_layer_mapping.h"
#include "third_party/blink/renderer/core/paint/fragment_data.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
namespace blink {
void CompositingLayerPropertyUpdater::Update(const LayoutObject& object) {
if (!RuntimeEnabledFeatures::SlimmingPaintV175Enabled() ||
RuntimeEnabledFeatures::SlimmingPaintV2Enabled())
return;
if (!object.HasLayer())
return;
const auto* paint_layer = ToLayoutBoxModelObject(object).Layer();
const auto* mapping = paint_layer->GetCompositedLayerMapping();
if (!mapping)
return;
const FragmentData& fragment_data = object.FirstFragment();
DCHECK(fragment_data.HasLocalBorderBoxProperties());
// SPv1 compositing forces single fragment for composited elements.
DCHECK(!fragment_data.NextFragment());
LayoutPoint layout_snapped_paint_offset =
fragment_data.PaintOffset() - mapping->SubpixelAccumulation();
IntPoint snapped_paint_offset = RoundedIntPoint(layout_snapped_paint_offset);
// TODO(crbug.com/816490): Re-enable this check once it is fixed.
// DCHECK(layout_snapped_paint_offset == snapped_paint_offset);
Optional<PropertyTreeState> container_layer_state;
auto SetContainerLayerState =
[&fragment_data, &snapped_paint_offset,
&container_layer_state](GraphicsLayer* graphics_layer) {
if (graphics_layer) {
if (!container_layer_state) {
container_layer_state = fragment_data.LocalBorderBoxProperties();
if (const auto* properties = fragment_data.PaintProperties()) {
// CSS clip should be applied within the layer.
if (const auto* css_clip = properties->CssClip())
container_layer_state->SetClip(css_clip->Parent());
}
}
graphics_layer->SetLayerState(
*container_layer_state,
snapped_paint_offset + graphics_layer->OffsetFromLayoutObject());
}
};
SetContainerLayerState(mapping->MainGraphicsLayer());
SetContainerLayerState(mapping->LayerForHorizontalScrollbar());
SetContainerLayerState(mapping->LayerForVerticalScrollbar());
SetContainerLayerState(mapping->LayerForScrollCorner());
SetContainerLayerState(mapping->DecorationOutlineLayer());
SetContainerLayerState(mapping->BackgroundLayer());
SetContainerLayerState(mapping->ChildClippingMaskLayer());
if (mapping->ScrollingContentsLayer()) {
auto paint_offset = snapped_paint_offset;
// In flipped blocks writing mode, if there is scrollbar on the right,
// we move the contents to the left with extra amount of ScrollTranslation
// (-VerticalScrollbarWidth, 0). However, ScrollTranslation doesn't apply
// on ScrollingContentsLayer so we shift paint offset instead.
if (object.IsBox() && object.HasFlippedBlocksWritingMode())
paint_offset.Move(ToLayoutBox(object).VerticalScrollbarWidth(), 0);
auto SetContentsLayerState =
[&fragment_data, &paint_offset](GraphicsLayer* graphics_layer) {
if (graphics_layer) {
graphics_layer->SetLayerState(
fragment_data.ContentsProperties(),
paint_offset + graphics_layer->OffsetFromLayoutObject());
}
};
SetContentsLayerState(mapping->ScrollingContentsLayer());
SetContentsLayerState(mapping->ForegroundLayer());
} else {
SetContainerLayerState(mapping->ForegroundLayer());
}
if (auto* squashing_layer = mapping->SquashingLayer()) {
auto state = fragment_data.PreEffectProperties();
// The squashing layer's ClippingContainer is the common ancestor of clip
// state of all squashed layers, so we should use its clip state. This skips
// any control clips on the squashing layer's object which should not apply
// on squashed layers.
const auto* clipping_container = paint_layer->ClippingContainer();
if (RuntimeEnabledFeatures::RootLayerScrollingEnabled()) {
state.SetClip(
clipping_container
? clipping_container->FirstFragment().ContentsProperties().Clip()
: ClipPaintPropertyNode::Root());
} else {
state.SetClip(
clipping_container
? clipping_container->FirstFragment().ContentsProperties().Clip()
: paint_layer->GetLayoutObject().GetFrameView()->ContentClip());
}
squashing_layer->SetLayerState(
state,
snapped_paint_offset + mapping->SquashingLayerOffsetFromLayoutObject());
}
if (auto* mask_layer = mapping->MaskLayer()) {
auto state = fragment_data.LocalBorderBoxProperties();
const auto* properties = fragment_data.PaintProperties();
DCHECK(properties && properties->Mask());
state.SetEffect(properties->Mask());
state.SetClip(properties->MaskClip());
mask_layer->SetLayerState(
state, snapped_paint_offset + mask_layer->OffsetFromLayoutObject());
}
if (auto* ancestor_clipping_mask_layer =
mapping->AncestorClippingMaskLayer()) {
PropertyTreeState state(
fragment_data.PreTransform(),
mapping->ClipInheritanceAncestor()
->GetLayoutObject()
.FirstFragment()
.PostOverflowClip(),
// This is a hack to incorporate mask-based clip-path. Really should be
// nullptr or some dummy.
fragment_data.PreFilter());
ancestor_clipping_mask_layer->SetLayerState(
state, snapped_paint_offset +
ancestor_clipping_mask_layer->OffsetFromLayoutObject());
}
if (auto* child_clipping_mask_layer = mapping->ChildClippingMaskLayer()) {
PropertyTreeState state = fragment_data.LocalBorderBoxProperties();
// Same hack as for ancestor_clipping_mask_layer.
state.SetEffect(fragment_data.PreFilter());
child_clipping_mask_layer->SetLayerState(
state, snapped_paint_offset +
child_clipping_mask_layer->OffsetFromLayoutObject());
}
}
void CompositingLayerPropertyUpdater::Update(const LocalFrameView& frame_view) {
if (!RuntimeEnabledFeatures::SlimmingPaintV175Enabled() ||
RuntimeEnabledFeatures::SlimmingPaintV2Enabled() ||
RuntimeEnabledFeatures::RootLayerScrollingEnabled())
return;
auto SetOverflowControlLayerState =
[&frame_view](GraphicsLayer* graphics_layer) {
if (graphics_layer) {
graphics_layer->SetLayerState(
frame_view.PreContentClipProperties(),
IntPoint(graphics_layer->OffsetFromLayoutObject()));
}
};
SetOverflowControlLayerState(frame_view.LayerForHorizontalScrollbar());
SetOverflowControlLayerState(frame_view.LayerForVerticalScrollbar());
SetOverflowControlLayerState(frame_view.LayerForScrollCorner());
}
} // namespace blink
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