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// Copyright 2015 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 "core/paint/PrePaintTreeWalk.h"
#include "core/dom/DocumentLifecycle.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/LocalFrameView.h"
#include "core/layout/LayoutEmbeddedContent.h"
#include "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
#include "core/layout/LayoutView.h"
#include "core/paint/PaintLayer.h"
#include "platform/graphics/paint/GeometryMapper.h"
namespace blink {
struct PrePaintTreeWalkContext {
PrePaintTreeWalkContext()
: tree_builder_context(
WTF::WrapUnique(new PaintPropertyTreeBuilderContext)),
paint_invalidator_context(WTF::WrapUnique(new PaintInvalidatorContext)),
ancestor_overflow_paint_layer(nullptr) {}
PrePaintTreeWalkContext(const PrePaintTreeWalkContext& parent_context,
bool needs_tree_builder_context)
: tree_builder_context(
WTF::WrapUnique(needs_tree_builder_context || DCHECK_IS_ON()
? new PaintPropertyTreeBuilderContext(
*parent_context.tree_builder_context)
: nullptr)),
paint_invalidator_context(WTF::WrapUnique(new PaintInvalidatorContext(
*parent_context.paint_invalidator_context))),
ancestor_overflow_paint_layer(
parent_context.ancestor_overflow_paint_layer) {
#if DCHECK_IS_ON()
if (needs_tree_builder_context)
DCHECK(parent_context.tree_builder_context->is_actually_needed);
tree_builder_context->is_actually_needed = needs_tree_builder_context;
#endif
}
// PaintPropertyTreeBuilderContext is large and can lead to stack overflows
// when recursion is deep so this context object is allocated on the heap.
// See: https://crbug.com/698653.
std::unique_ptr<PaintPropertyTreeBuilderContext> tree_builder_context;
std::unique_ptr<PaintInvalidatorContext> paint_invalidator_context;
// The ancestor in the PaintLayer tree which has overflow clip, or
// is the root layer. Note that it is tree ancestor, not containing
// block or stacking ancestor.
PaintLayer* ancestor_overflow_paint_layer;
};
void PrePaintTreeWalk::Walk(LocalFrameView& root_frame) {
DCHECK(root_frame.GetFrame().GetDocument()->Lifecycle().GetState() ==
DocumentLifecycle::kInPrePaint);
PrePaintTreeWalkContext initial_context;
// GeometryMapper depends on paint properties.
if (NeedsTreeBuilderContextUpdate(root_frame, initial_context))
GeometryMapper::ClearCache();
Walk(root_frame, initial_context);
paint_invalidator_.ProcessPendingDelayedPaintInvalidations();
}
void PrePaintTreeWalk::Walk(LocalFrameView& frame_view,
const PrePaintTreeWalkContext& parent_context) {
if (frame_view.ShouldThrottleRendering()) {
// Skip the throttled frame. Will update it when it becomes unthrottled.
return;
}
bool needs_tree_builder_context_update =
this->NeedsTreeBuilderContextUpdate(frame_view, parent_context);
PrePaintTreeWalkContext context(parent_context,
needs_tree_builder_context_update);
// ancestorOverflowLayer does not cross frame boundaries.
context.ancestor_overflow_paint_layer = nullptr;
if (context.tree_builder_context) {
property_tree_builder_.UpdateProperties(frame_view,
*context.tree_builder_context);
}
paint_invalidator_.InvalidatePaint(frame_view,
context.tree_builder_context.get(),
*context.paint_invalidator_context);
if (LayoutView* view = frame_view.GetLayoutView()) {
Walk(*view, context);
#if DCHECK_IS_ON()
view->AssertSubtreeClearedPaintInvalidationFlags();
#endif
}
frame_view.ClearNeedsPaintPropertyUpdate();
}
static void UpdateAuxiliaryObjectProperties(const LayoutObject& object,
PrePaintTreeWalkContext& context) {
if (!RuntimeEnabledFeatures::SlimmingPaintV2Enabled())
return;
if (!object.HasLayer())
return;
PaintLayer* paint_layer = object.EnclosingLayer();
paint_layer->UpdateAncestorOverflowLayer(
context.ancestor_overflow_paint_layer);
if (object.StyleRef().HasStickyConstrainedPosition()) {
paint_layer->GetLayoutObject().UpdateStickyPositionConstraints();
// Sticky position constraints and ancestor overflow scroller affect the
// sticky layer position, so we need to update it again here.
// TODO(flackr): This should be refactored in the future to be clearer (i.e.
// update layer position and ancestor inputs updates in the same walk).
paint_layer->UpdateLayerPosition();
}
if (paint_layer->IsRootLayer() || object.HasOverflowClip())
context.ancestor_overflow_paint_layer = paint_layer;
}
void PrePaintTreeWalk::InvalidatePaintLayerOptimizationsIfNeeded(
const LayoutObject& object,
PrePaintTreeWalkContext& context) {
if (!object.HasLayer())
return;
PaintLayer& paint_layer = *ToLayoutBoxModelObject(object).Layer();
// Ignore clips across paint invalidation container or transform
// boundaries.
if (object ==
context.paint_invalidator_context->paint_invalidation_container ||
object.StyleRef().HasTransform())
context.tree_builder_context->clip_changed = false;
if (!paint_layer.SupportsSubsequenceCaching() ||
!context.tree_builder_context->clip_changed)
return;
paint_layer.SetNeedsRepaint();
paint_layer.SetPreviousPaintPhaseDescendantOutlinesEmpty(false);
paint_layer.SetPreviousPaintPhaseFloatEmpty(false);
paint_layer.SetPreviousPaintPhaseDescendantBlockBackgroundsEmpty(false);
context.paint_invalidator_context->subtree_flags |=
PaintInvalidatorContext::kSubtreeVisualRectUpdate;
}
bool PrePaintTreeWalk::NeedsTreeBuilderContextUpdate(
const LocalFrameView& frame_view,
const PrePaintTreeWalkContext& context) {
return frame_view.NeedsPaintPropertyUpdate() ||
(frame_view.GetLayoutView() &&
NeedsTreeBuilderContextUpdate(*frame_view.GetLayoutView(), context));
}
bool PrePaintTreeWalk::NeedsTreeBuilderContextUpdate(
const LayoutObject& object,
const PrePaintTreeWalkContext& parent_context) {
return object.NeedsPaintPropertyUpdate() ||
object.DescendantNeedsPaintPropertyUpdate() ||
(parent_context.tree_builder_context &&
parent_context.tree_builder_context->force_subtree_update) ||
// If the object needs visual rect update, we should update tree
// builder context which is needed by visual rect update.
parent_context.paint_invalidator_context->NeedsVisualRectUpdate(
object);
}
void PrePaintTreeWalk::WalkInternal(const LayoutObject& object,
PrePaintTreeWalkContext& context) {
// This must happen before updatePropertiesForSelf, because the latter reads
// some of the state computed here.
UpdateAuxiliaryObjectProperties(object, context);
if (context.tree_builder_context) {
property_tree_builder_.UpdatePropertiesForSelf(
object, *context.tree_builder_context);
if (context.tree_builder_context->clip_changed) {
context.paint_invalidator_context->subtree_flags |=
PaintInvalidatorContext::kSubtreeVisualRectUpdate;
}
}
paint_invalidator_.InvalidatePaint(object, context.tree_builder_context.get(),
*context.paint_invalidator_context);
if (context.tree_builder_context) {
property_tree_builder_.UpdatePropertiesForChildren(
object, *context.tree_builder_context);
InvalidatePaintLayerOptimizationsIfNeeded(object, context);
}
}
void PrePaintTreeWalk::Walk(const LayoutObject& object,
const PrePaintTreeWalkContext& parent_context) {
// Early out from the tree walk if possible.
bool needs_tree_builder_context_update =
this->NeedsTreeBuilderContextUpdate(object, parent_context);
if (!needs_tree_builder_context_update &&
!object.ShouldCheckForPaintInvalidation())
return;
PrePaintTreeWalkContext context(parent_context,
needs_tree_builder_context_update);
WalkInternal(object, context);
for (const LayoutObject* child = object.SlowFirstChild(); child;
child = child->NextSibling()) {
if (child->IsLayoutMultiColumnSpannerPlaceholder()) {
child->GetMutableForPainting().ClearPaintFlags();
continue;
}
Walk(*child, context);
}
if (object.IsLayoutEmbeddedContent()) {
const LayoutEmbeddedContent& layout_embedded_content =
ToLayoutEmbeddedContent(object);
LocalFrameView* frame_view = layout_embedded_content.ChildFrameView();
if (frame_view) {
if (context.tree_builder_context) {
context.tree_builder_context->fragments[0].current.paint_offset +=
layout_embedded_content.ReplacedContentRect().Location() -
frame_view->FrameRect().Location();
context.tree_builder_context->fragments[0].current.paint_offset =
RoundedIntPoint(context.tree_builder_context->fragments[0]
.current.paint_offset);
}
Walk(*frame_view, context);
}
// TODO(pdr): Investigate RemoteFrameView (crbug.com/579281).
}
object.GetMutableForPainting().ClearPaintFlags();
}
} // namespace blink
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