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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_PLATFORM_GRAPHICS_COMPOSITING_REASONS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COMPOSITING_REASONS_H_
#include <stdint.h>
#include <vector>
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
using CompositingReasons = uint64_t;
#define FOR_EACH_COMPOSITING_REASON(V) \
/* Intrinsic reasons that can be known right away by the layer. */ \
V(3DTransform) \
V(Trivial3DTransform) \
V(Video) \
V(Canvas) \
V(Plugin) \
V(IFrame) \
/* This is used for pre-CompositAfterPaint + CompositeSVG only. */ \
V(SVGRoot) \
V(BackfaceVisibilityHidden) \
V(ActiveTransformAnimation) \
V(ActiveOpacityAnimation) \
V(ActiveFilterAnimation) \
V(ActiveBackdropFilterAnimation) \
V(AffectedByOuterViewportBoundsDelta) \
V(FixedPosition) \
V(StickyPosition) \
V(OverflowScrolling) \
V(OverflowScrollingParent) \
V(OutOfFlowClipping) \
V(VideoOverlay) \
V(WillChangeTransform) \
V(WillChangeOpacity) \
V(WillChangeFilter) \
V(WillChangeBackdropFilter) \
/* Reasons that depend on ancestor properties */ \
V(BackfaceInvisibility3DAncestor) \
/* This flag is needed only when none of the explicit kWillChange* reasons \
are set. */ \
V(WillChangeOther) \
V(BackdropFilter) \
V(BackdropFilterMask) \
V(RootScroller) \
V(XrOverlay) \
V(Viewport) \
\
/* Overlap reasons that require knowing what's behind you in paint-order \
before knowing the answer. */ \
V(AssumedOverlap) \
V(Overlap) \
V(NegativeZIndexChildren) \
V(SquashingDisallowed) \
\
/* Subtree reasons that require knowing what the status of your subtree is \
before knowing the answer. */ \
V(OpacityWithCompositedDescendants) \
V(MaskWithCompositedDescendants) \
V(ReflectionWithCompositedDescendants) \
V(FilterWithCompositedDescendants) \
V(BlendingWithCompositedDescendants) \
V(PerspectiveWith3DDescendants) \
V(Preserve3DWith3DDescendants) \
V(IsolateCompositedDescendants) \
V(FullscreenVideoWithCompositedDescendants) \
\
/* The root layer is a special case. It may be forced to be a layer, but it \
also needs to be a layer if anything else in the subtree is composited. */ \
V(Root) \
\
/* CompositedLayerMapping internal hierarchy reasons. Some of them are also \
used in CompositeAfterPaint. */ \
V(LayerForHorizontalScrollbar) \
V(LayerForVerticalScrollbar) \
V(LayerForScrollCorner) \
V(LayerForScrollingContents) \
V(LayerForSquashingContents) \
V(LayerForForeground) \
V(LayerForMask) \
/* Composited layer painted on top of all other layers as decoration. */ \
V(LayerForDecoration) \
/* Used in CompositeAfterPaint for link highlight, frame overlay, etc. */ \
V(LayerForOther) \
/* DocumentTransition shared element. \
See third_party/blink/renderer/core/document_transition/README.md. */ \
V(DocumentTransitionSharedElement)
class PLATFORM_EXPORT CompositingReason {
DISALLOW_NEW();
private:
// This contains ordinal values for compositing reasons and will be used to
// generate the compositing reason bits.
enum {
#define V(name) kE##name,
FOR_EACH_COMPOSITING_REASON(V)
#undef V
};
#define V(name) static_assert(kE##name < 64, "Should fit in 64 bits");
FOR_EACH_COMPOSITING_REASON(V)
#undef V
public:
static std::vector<const char*> ShortNames(CompositingReasons);
static std::vector<const char*> Descriptions(CompositingReasons);
static String ToString(CompositingReasons);
enum : CompositingReasons {
kNone = 0,
kAll = ~static_cast<CompositingReasons>(0),
#define V(name) k##name = UINT64_C(1) << kE##name,
FOR_EACH_COMPOSITING_REASON(V)
#undef V
// Various combinations of compositing reasons are defined here also, for
// more intuitive and faster bitwise logic.
kComboActiveAnimation =
kActiveTransformAnimation | kActiveOpacityAnimation |
kActiveFilterAnimation | kActiveBackdropFilterAnimation,
kComboAllDirectStyleDeterminedReasons =
k3DTransform | kTrivial3DTransform | kBackfaceVisibilityHidden |
kComboActiveAnimation | kWillChangeTransform | kWillChangeOpacity |
kWillChangeFilter | kWillChangeOther | kBackdropFilter |
kWillChangeBackdropFilter,
kComboScrollDependentPosition = kFixedPosition | kStickyPosition,
kComboAllDirectNonStyleDeterminedReasons =
kVideo | kCanvas | kPlugin | kIFrame | kSVGRoot |
kOverflowScrollingParent | kOutOfFlowClipping | kVideoOverlay |
kXrOverlay | kRoot | kRootScroller | kComboScrollDependentPosition |
kAffectedByOuterViewportBoundsDelta | kBackfaceInvisibility3DAncestor |
kDocumentTransitionSharedElement,
kComboAllDirectReasons = kComboAllDirectStyleDeterminedReasons |
kComboAllDirectNonStyleDeterminedReasons,
kComboAllCompositedScrollingDeterminedReasons =
kComboScrollDependentPosition | kAffectedByOuterViewportBoundsDelta |
kOverflowScrolling,
kComboCompositedDescendants =
kIsolateCompositedDescendants | kOpacityWithCompositedDescendants |
kMaskWithCompositedDescendants | kFilterWithCompositedDescendants |
kBlendingWithCompositedDescendants |
kReflectionWithCompositedDescendants,
kCombo3DDescendants =
kPreserve3DWith3DDescendants | kPerspectiveWith3DDescendants,
kComboAllStyleDeterminedReasons = kComboAllDirectStyleDeterminedReasons |
kComboCompositedDescendants |
kCombo3DDescendants,
kComboSquashableReasons =
kOverlap | kAssumedOverlap | kOverflowScrollingParent,
kPreventingSubpixelAccumulationReasons = kWillChangeTransform,
kDirectReasonsForPaintOffsetTranslationProperty =
kComboScrollDependentPosition | kAffectedByOuterViewportBoundsDelta |
kVideo | kCanvas | kPlugin | kIFrame | kSVGRoot,
kDirectReasonsForTransformProperty =
k3DTransform | kTrivial3DTransform | kWillChangeTransform |
kWillChangeOther | kPerspectiveWith3DDescendants |
kPreserve3DWith3DDescendants | kActiveTransformAnimation,
kDirectReasonsForScrollTranslationProperty =
kRootScroller | kOverflowScrolling,
kDirectReasonsForEffectProperty =
kActiveOpacityAnimation | kWillChangeOpacity | kBackdropFilter |
kWillChangeBackdropFilter | kActiveBackdropFilterAnimation |
kDocumentTransitionSharedElement,
kDirectReasonsForFilterProperty =
kActiveFilterAnimation | kWillChangeFilter,
kDirectReasonsForBackdropFilter = kBackdropFilter |
kActiveBackdropFilterAnimation |
kWillChangeBackdropFilter,
};
};
// Any reasons other than overlap or assumed overlap will require the layer to
// be separately compositing.
inline bool RequiresCompositing(CompositingReasons reasons) {
return reasons & ~CompositingReason::kComboSquashableReasons;
}
// If the layer has overlap or assumed overlap, but no other reasons, then it
// should be squashed.
inline bool RequiresSquashing(CompositingReasons reasons) {
return !RequiresCompositing(reasons) &&
(reasons & CompositingReason::kComboSquashableReasons);
}
struct CompositingReasonsStats {
int overlap_layers = 0;
int active_animation_layers = 0;
int assumed_overlap_layers = 0;
int indirect_composited_layers = 0;
int total_composited_layers = 0;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_COMPOSITING_REASONS_H_
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