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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 CompositingReasons_h
#define CompositingReasons_h
#include "platform/PlatformExport.h"
#include "wtf/Allocator.h"
#include "wtf/text/WTFString.h"
#include <stdint.h>
namespace blink {
const uint64_t CompositingReasonNone = 0;
const uint64_t CompositingReasonAll = ~static_cast<uint64_t>(0);
// Intrinsic reasons that can be known right away by the layer
const uint64_t CompositingReason3DTransform = UINT64_C(1) << 0;
const uint64_t CompositingReasonVideo = UINT64_C(1) << 1;
const uint64_t CompositingReasonCanvas = UINT64_C(1) << 2;
const uint64_t CompositingReasonPlugin = UINT64_C(1) << 3;
const uint64_t CompositingReasonIFrame = UINT64_C(1) << 4;
const uint64_t CompositingReasonBackfaceVisibilityHidden = UINT64_C(1) << 5;
const uint64_t CompositingReasonActiveAnimation = UINT64_C(1) << 6;
const uint64_t CompositingReasonTransitionProperty = UINT64_C(1) << 7;
const uint64_t CompositingReasonScrollDependentPosition = UINT64_C(1) << 8;
const uint64_t CompositingReasonOverflowScrollingTouch = UINT64_C(1) << 9;
const uint64_t CompositingReasonOverflowScrollingParent = UINT64_C(1) << 10;
const uint64_t CompositingReasonOutOfFlowClipping = UINT64_C(1) << 11;
const uint64_t CompositingReasonVideoOverlay = UINT64_C(1) << 12;
const uint64_t CompositingReasonWillChangeCompositingHint = UINT64_C(1) << 13;
const uint64_t CompositingReasonBackdropFilter = UINT64_C(1) << 14;
// Overlap reasons that require knowing what's behind you in paint-order before
// knowing the answer.
const uint64_t CompositingReasonAssumedOverlap = UINT64_C(1) << 15;
const uint64_t CompositingReasonOverlap = UINT64_C(1) << 16;
const uint64_t CompositingReasonNegativeZIndexChildren = UINT64_C(1) << 17;
const uint64_t CompositingReasonSquashingDisallowed = UINT64_C(1) << 18;
// Subtree reasons that require knowing what the status of your subtree is
// before knowing the answer.
const uint64_t CompositingReasonTransformWithCompositedDescendants = UINT64_C(1)
<< 19;
const uint64_t CompositingReasonOpacityWithCompositedDescendants = UINT64_C(1)
<< 20;
const uint64_t CompositingReasonMaskWithCompositedDescendants = UINT64_C(1)
<< 21;
const uint64_t CompositingReasonReflectionWithCompositedDescendants =
UINT64_C(1) << 22;
const uint64_t CompositingReasonFilterWithCompositedDescendants = UINT64_C(1)
<< 23;
const uint64_t CompositingReasonBlendingWithCompositedDescendants = UINT64_C(1)
<< 24;
const uint64_t CompositingReasonClipsCompositingDescendants = UINT64_C(1) << 25;
const uint64_t CompositingReasonPerspectiveWith3DDescendants = UINT64_C(1)
<< 26;
const uint64_t CompositingReasonPreserve3DWith3DDescendants = UINT64_C(1) << 27;
const uint64_t CompositingReasonReflectionOfCompositedParent = UINT64_C(1)
<< 28;
const uint64_t CompositingReasonIsolateCompositedDescendants = UINT64_C(1)
<< 29;
const uint64_t CompositingReasonPositionFixedWithCompositedDescendants =
UINT64_C(1) << 30;
// 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.
const uint64_t CompositingReasonRoot = UINT64_C(1) << 31;
// CompositedLayerMapping internal hierarchy reasons
const uint64_t CompositingReasonLayerForAncestorClip = UINT64_C(1) << 32;
const uint64_t CompositingReasonLayerForDescendantClip = UINT64_C(1) << 33;
const uint64_t CompositingReasonLayerForPerspective = UINT64_C(1) << 34;
const uint64_t CompositingReasonLayerForHorizontalScrollbar = UINT64_C(1) << 35;
const uint64_t CompositingReasonLayerForVerticalScrollbar = UINT64_C(1) << 36;
const uint64_t CompositingReasonLayerForOverflowControlsHost = UINT64_C(1)
<< 37;
const uint64_t CompositingReasonLayerForScrollCorner = UINT64_C(1) << 38;
const uint64_t CompositingReasonLayerForScrollingContents = UINT64_C(1) << 39;
const uint64_t CompositingReasonLayerForScrollingContainer = UINT64_C(1) << 40;
const uint64_t CompositingReasonLayerForSquashingContents = UINT64_C(1) << 41;
const uint64_t CompositingReasonLayerForSquashingContainer = UINT64_C(1) << 42;
const uint64_t CompositingReasonLayerForForeground = UINT64_C(1) << 43;
const uint64_t CompositingReasonLayerForBackground = UINT64_C(1) << 44;
const uint64_t CompositingReasonLayerForMask = UINT64_C(1) << 45;
const uint64_t CompositingReasonLayerForClippingMask = UINT64_C(1) << 46;
const uint64_t CompositingReasonLayerForAncestorClippingMask = UINT64_C(1)
<< 47;
const uint64_t CompositingReasonLayerForScrollingBlockSelection = UINT64_C(1)
<< 48;
// Composited layer painted on top of all other layers as decoration
const uint64_t CompositingReasonLayerForDecoration = UINT64_C(1) << 49;
// Composited elements with inline transforms trigger assumed overlap so that
// we can update their transforms quickly.
const uint64_t CompositingReasonInlineTransform = UINT64_C(1) << 50;
const uint64_t CompositingReasonCompositorProxy = UINT64_C(1) << 51;
// Various combinations of compositing reasons are defined here also, for more
// intutive and faster bitwise logic.
const uint64_t CompositingReasonComboAllDirectReasons =
CompositingReason3DTransform | CompositingReasonVideo |
CompositingReasonCanvas | CompositingReasonPlugin |
CompositingReasonIFrame | CompositingReasonBackfaceVisibilityHidden |
CompositingReasonActiveAnimation | CompositingReasonTransitionProperty |
CompositingReasonScrollDependentPosition |
CompositingReasonOverflowScrollingTouch |
CompositingReasonOverflowScrollingParent |
CompositingReasonOutOfFlowClipping | CompositingReasonVideoOverlay |
CompositingReasonWillChangeCompositingHint |
CompositingReasonCompositorProxy | CompositingReasonBackdropFilter;
const uint64_t CompositingReasonComboAllDirectStyleDeterminedReasons =
CompositingReason3DTransform | CompositingReasonBackfaceVisibilityHidden |
CompositingReasonActiveAnimation | CompositingReasonTransitionProperty |
CompositingReasonWillChangeCompositingHint |
CompositingReasonCompositorProxy | CompositingReasonBackdropFilter;
const uint64_t CompositingReasonComboCompositedDescendants =
CompositingReasonTransformWithCompositedDescendants |
CompositingReasonIsolateCompositedDescendants |
CompositingReasonOpacityWithCompositedDescendants |
CompositingReasonMaskWithCompositedDescendants |
CompositingReasonFilterWithCompositedDescendants |
CompositingReasonBlendingWithCompositedDescendants |
CompositingReasonReflectionWithCompositedDescendants |
CompositingReasonClipsCompositingDescendants |
CompositingReasonPositionFixedWithCompositedDescendants;
const uint64_t CompositingReasonCombo3DDescendants =
CompositingReasonPreserve3DWith3DDescendants |
CompositingReasonPerspectiveWith3DDescendants;
const uint64_t CompositingReasonComboAllStyleDeterminedReasons =
CompositingReasonComboAllDirectStyleDeterminedReasons |
CompositingReasonComboCompositedDescendants |
CompositingReasonCombo3DDescendants | CompositingReasonInlineTransform;
const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =
CompositingReasonComboAllDirectReasons | CompositingReasonOverlap |
CompositingReasonAssumedOverlap | CompositingReasonNegativeZIndexChildren |
CompositingReasonSquashingDisallowed |
CompositingReasonTransformWithCompositedDescendants |
CompositingReasonOpacityWithCompositedDescendants |
CompositingReasonMaskWithCompositedDescendants |
CompositingReasonFilterWithCompositedDescendants |
CompositingReasonBlendingWithCompositedDescendants |
CompositingReasonIsolateCompositedDescendants |
CompositingReasonPreserve3DWith3DDescendants | // preserve-3d has to create
// a backing store to ensure
// that 3d-transformed
// elements intersect.
CompositingReasonBackdropFilter |
CompositingReasonPositionFixedWithCompositedDescendants;
const uint64_t CompositingReasonComboSquashableReasons =
CompositingReasonOverlap | CompositingReasonAssumedOverlap |
CompositingReasonOverflowScrollingParent;
typedef uint64_t CompositingReasons;
// Any reasons other than overlap or assumed overlap will require the layer to
// be separately compositing.
inline bool requiresCompositing(CompositingReasons reasons) {
return reasons & ~CompositingReasonComboSquashableReasons;
}
// 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 & CompositingReasonComboSquashableReasons);
}
struct CompositingReasonStringMap {
STACK_ALLOCATED();
CompositingReasons reason;
const char* shortName;
const char* description;
};
PLATFORM_EXPORT extern const CompositingReasonStringMap
kCompositingReasonStringMap[];
PLATFORM_EXPORT extern const size_t kNumberOfCompositingReasons;
PLATFORM_EXPORT String compositingReasonsAsString(CompositingReasons);
} // namespace blink
#endif // CompositingReasons_h
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