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// Copyright 2014 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_INPUTS_UPDATER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_INPUTS_UPDATER_H_
#include "third_party/blink/renderer/core/layout/layout_geometry_map.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
class PaintLayer;
class CompositingInputsUpdater {
STACK_ALLOCATED();
public:
explicit CompositingInputsUpdater(PaintLayer* root_layer);
~CompositingInputsUpdater();
void Update();
#if DCHECK_IS_ON()
static void AssertNeedsCompositingInputsUpdateBitsCleared(PaintLayer*);
#endif
private:
enum UpdateType {
kDoNotForceUpdate,
kForceUpdate,
};
struct AncestorInfo {
// The ancestor composited PaintLayer which is also a stacking context.
PaintLayer* enclosing_stacking_composited_layer = nullptr;
// A "squashing composited layer" is a PaintLayer that owns a squashing
// layer. This variable stores the squashing composited layer for the
// nearest PaintLayer ancestor which is squashed.
PaintLayer* enclosing_squashing_composited_layer = nullptr;
PaintLayer* last_overflow_clip_layer = nullptr;
PaintLayer* clip_chain_parent_for_absolute = nullptr;
PaintLayer* clip_chain_parent_for_fixed = nullptr;
// These flags are set if we encountered a stacking context
// that will make descendants to inherit more clip than desired,
// so we have to setup an alternative clip parent instead.
PaintLayer* escape_clip_to = nullptr;
PaintLayer* escape_clip_to_for_absolute = nullptr;
PaintLayer* escape_clip_to_for_fixed = nullptr;
PaintLayer* scrolling_ancestor = nullptr;
PaintLayer* scrolling_ancestor_for_absolute = nullptr;
PaintLayer* scrolling_ancestor_for_fixed = nullptr;
// These flags are set to true if a non-stacking context scroller
// is encountered, so that a descendant element won't inherit scroll
// translation from its compositing ancestor directly thus having to
// setup an alternative scroll parent instead.
bool needs_reparent_scroll = false;
bool needs_reparent_scroll_for_absolute = false;
bool needs_reparent_scroll_for_fixed = false;
bool is_under_video = false;
};
void UpdateRecursive(PaintLayer*, UpdateType, AncestorInfo);
void UpdateAncestorDependentCompositingInputs(PaintLayer*,
const AncestorInfo&);
LayoutGeometryMap geometry_map_;
PaintLayer* root_layer_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_INPUTS_UPDATER_H_
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