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// Copyright 2013 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 "wtf/MathExtras.h"
#include <stdint.h>
namespace WebCore {
const uint64_t CompositingReasonNone = 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 CompositingReasonAnimation = UINT64_C(1) << 6;
const uint64_t CompositingReasonFilters = UINT64_C(1) << 7;
const uint64_t CompositingReasonPositionFixed = UINT64_C(1) << 8;
const uint64_t CompositingReasonPositionSticky = UINT64_C(1) << 9;
const uint64_t CompositingReasonOverflowScrollingTouch = UINT64_C(1) << 10;
// Overlap reasons that require knowing what's behind you in paint-order before knowing the answer
const uint64_t CompositingReasonAssumedOverlap = UINT64_C(1) << 12;
const uint64_t CompositingReasonOverlap = UINT64_C(1) << 13;
const uint64_t CompositingReasonNegativeZIndexChildren = UINT64_C(1) << 14;
// Subtree reasons that require knowing what the status of your subtree is before knowing the answer
const uint64_t CompositingReasonTransformWithCompositedDescendants = UINT64_C(1) << 15;
const uint64_t CompositingReasonOpacityWithCompositedDescendants = UINT64_C(1) << 16;
const uint64_t CompositingReasonMaskWithCompositedDescendants = UINT64_C(1) << 17;
const uint64_t CompositingReasonReflectionWithCompositedDescendants = UINT64_C(1) << 18;
const uint64_t CompositingReasonFilterWithCompositedDescendants = UINT64_C(1) << 19;
const uint64_t CompositingReasonBlendingWithCompositedDescendants = UINT64_C(1) << 20;
const uint64_t CompositingReasonClipsCompositingDescendants = UINT64_C(1) << 21;
const uint64_t CompositingReasonPerspective = UINT64_C(1) << 22;
const uint64_t CompositingReasonPreserve3D = UINT64_C(1) << 23;
const uint64_t CompositingReasonReflectionOfCompositedParent = UINT64_C(1) << 24;
// The root layer is a special case that may be forced to be a layer, but also it needs to be
// a layer if anything else in the subtree is composited.
const uint64_t CompositingReasonRoot = UINT64_C(1) << 25;
// CompositedLayerMapping internal hierarchy reasons
const uint64_t CompositingReasonLayerForClip = UINT64_C(1) << 26;
const uint64_t CompositingReasonLayerForScrollbar = UINT64_C(1) << 27;
const uint64_t CompositingReasonLayerForScrollingContainer = UINT64_C(1) << 28;
const uint64_t CompositingReasonLayerForForeground = UINT64_C(1) << 29;
const uint64_t CompositingReasonLayerForBackground = UINT64_C(1) << 30;
const uint64_t CompositingReasonLayerForMask = UINT64_C(1) << 31;
// FIXME: the following compositing reasons need to be re-organized to fit with categories
// used in all the other reasons above.
const uint64_t CompositingReasonOverflowScrollingParent = UINT64_C(1) << 32;
const uint64_t CompositingReasonOutOfFlowClipping = UINT64_C(1) << 33;
const uint64_t CompositingReasonLayerForVideoOverlay = UINT64_C(1) << 34;
const uint64_t CompositingReasonIsolateCompositedDescendants = UINT64_C(1) << 35;
// Note: if you add more reasons here, you will need to update WebCompositingReasons as well.
// 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
| CompositingReasonAnimation
| CompositingReasonFilters
| CompositingReasonPositionFixed
| CompositingReasonPositionSticky
| CompositingReasonOverflowScrollingTouch
| CompositingReasonOverflowScrollingParent
| CompositingReasonOutOfFlowClipping;
const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =
CompositingReasonComboAllDirectReasons
| CompositingReasonOverlap
| CompositingReasonAssumedOverlap
| CompositingReasonNegativeZIndexChildren
| CompositingReasonTransformWithCompositedDescendants
| CompositingReasonOpacityWithCompositedDescendants
| CompositingReasonMaskWithCompositedDescendants
| CompositingReasonFilterWithCompositedDescendants
| CompositingReasonBlendingWithCompositedDescendants
| CompositingReasonIsolateCompositedDescendants
| CompositingReasonPreserve3D; // preserve-3d has to create backing store to ensure that 3d-transformed elements intersect.
const uint64_t CompositingReasonComboAllOverlapReasons =
CompositingReasonOverlap
| CompositingReasonAssumedOverlap;
typedef uint64_t CompositingReasons;
} // namespace WebCore
#endif // CompositingReasons_h
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