Source/platform/graphics/CompositingReasons.h - Issue 175263002: Implement will-change-based creation of layers, stacking contexts, and containing blocks

Unified Diff: Source/platform/graphics/CompositingReasons.h

Issue 175263002: Implement will-change-based creation of layers, stacking contexts, and containing blocks (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Always create a stacking context for will-change:position Created 6 years, 10 months ago

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Index: Source/platform/graphics/CompositingReasons.h

diff --git a/Source/platform/graphics/CompositingReasons.h b/Source/platform/graphics/CompositingReasons.h

index 104a0817f724dafc45a6c930f1ef5f280c84322b..b50a6d64c50994cb575416f8f478d37f53b12f19 100644

--- a/Source/platform/graphics/CompositingReasons.h

+++ b/Source/platform/graphics/CompositingReasons.h

@@ -28,45 +28,46 @@ const uint64_t CompositingReasonOverflowScrollingTouch = UINT64_

const uint64_t CompositingReasonOverflowScrollingParent = UINT64_C(1) << 12;

const uint64_t CompositingReasonOutOfFlowClipping = UINT64_C(1) << 13;

const uint64_t CompositingReasonVideoOverlay = UINT64_C(1) << 14;

+const uint64_t CompositingReasonWillChange = UINT64_C(1) << 15;

// 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 CompositingReasonOverlapsWithoutSquashingTarget = UINT64_C(1) << 18;

+const uint64_t CompositingReasonAssumedOverlap = UINT64_C(1) << 16;

+const uint64_t CompositingReasonOverlap = UINT64_C(1) << 17;

+const uint64_t CompositingReasonNegativeZIndexChildren = UINT64_C(1) << 18;

+const uint64_t CompositingReasonOverlapsWithoutSquashingTarget = UINT64_C(1) << 19;

// 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 CompositingReasonTransformWithCompositedDescendants = UINT64_C(1) << 20;

+const uint64_t CompositingReasonOpacityWithCompositedDescendants = UINT64_C(1) << 21;

+const uint64_t CompositingReasonMaskWithCompositedDescendants = UINT64_C(1) << 22;

+const uint64_t CompositingReasonReflectionWithCompositedDescendants = UINT64_C(1) << 23;

+const uint64_t CompositingReasonFilterWithCompositedDescendants = UINT64_C(1) << 24;

+const uint64_t CompositingReasonBlendingWithCompositedDescendants = UINT64_C(1) << 25;

+const uint64_t CompositingReasonClipsCompositingDescendants = UINT64_C(1) << 26;

+const uint64_t CompositingReasonPerspectiveWith3DDescendants = UINT64_C(1) << 27;

+const uint64_t CompositingReasonPreserve3DWith3DDescendants = UINT64_C(1) << 28;

+const uint64_t CompositingReasonReflectionOfCompositedParent = UINT64_C(1) << 29;

+const uint64_t CompositingReasonIsolateCompositedDescendants = UINT64_C(1) << 30;

// 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) << 30;

+const uint64_t CompositingReasonRoot = UINT64_C(1) << 31;

// CompositedLayerMapping internal hierarchy reasons

-const uint64_t CompositingReasonLayerForAncestorClip = UINT64_C(1) << 31;

-const uint64_t CompositingReasonLayerForDescendantClip = UINT64_C(1) << 32;

-const uint64_t CompositingReasonLayerForPerspective = UINT64_C(1) << 33;

-const uint64_t CompositingReasonLayerForHorizontalScrollbar = UINT64_C(1) << 34;

-const uint64_t CompositingReasonLayerForVerticalScrollbar = UINT64_C(1) << 35;

-const uint64_t CompositingReasonLayerForScrollCorner = UINT64_C(1) << 36;

-const uint64_t CompositingReasonLayerForScrollingContents = UINT64_C(1) << 37;

-const uint64_t CompositingReasonLayerForScrollingContainer = UINT64_C(1) << 38;

-const uint64_t CompositingReasonLayerForSquashingContents = UINT64_C(1) << 39;

-const uint64_t CompositingReasonLayerForSquashingContainer = UINT64_C(1) << 40;

-const uint64_t CompositingReasonLayerForForeground = UINT64_C(1) << 41;

-const uint64_t CompositingReasonLayerForBackground = UINT64_C(1) << 42;

-const uint64_t CompositingReasonLayerForMask = UINT64_C(1) << 43;

-const uint64_t CompositingReasonLayerForClippingMask = UINT64_C(1) << 44;

+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 CompositingReasonLayerForScrollCorner = UINT64_C(1) << 37;

+const uint64_t CompositingReasonLayerForScrollingContents = UINT64_C(1) << 38;

+const uint64_t CompositingReasonLayerForScrollingContainer = UINT64_C(1) << 39;

+const uint64_t CompositingReasonLayerForSquashingContents = UINT64_C(1) << 40;

+const uint64_t CompositingReasonLayerForSquashingContainer = UINT64_C(1) << 41;

+const uint64_t CompositingReasonLayerForForeground = UINT64_C(1) << 42;

+const uint64_t CompositingReasonLayerForBackground = UINT64_C(1) << 43;

+const uint64_t CompositingReasonLayerForMask = UINT64_C(1) << 44;

+const uint64_t CompositingReasonLayerForClippingMask = UINT64_C(1) << 45;

// Various combinations of compositing reasons are defined here also, for more intutive and faster bitwise logic.

const uint64_t CompositingReasonComboAllDirectReasons =

@@ -84,7 +85,8 @@ const uint64_t CompositingReasonComboAllDirectReasons =

| CompositingReasonOverflowScrollingTouch

| CompositingReasonOverflowScrollingParent

| CompositingReasonOutOfFlowClipping

- | CompositingReasonVideoOverlay;

+ | CompositingReasonVideoOverlay

+ | CompositingReasonWillChange;

const uint64_t CompositingReasonComboReasonsThatRequireOwnBacking =

CompositingReasonComboAllDirectReasons

@@ -161,6 +163,9 @@ static const CompositingReasonStringMap compositingReasonStringMap[] = {

{ CompositingReasonVideoOverlay,

"videoOverlay",

"Is overlay controls for video" },

+ { CompositingReasonWillChange,

+ "willChange",

+ "Has a will-change compositing hint" },

{ CompositingReasonAssumedOverlap,

"assumedOverlap",

"Might overlap other composited content" },

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