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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.
#include "platform/graphics/CompositingReasons.h"
#include "wtf/StdLibExtras.h"
#include "wtf/text/StringBuilder.h"
namespace blink {
const CompositingReasonStringMap kCompositingReasonStringMap[] = {
{CompositingReasonNone, "Unknown", "No reason given"},
{CompositingReason3DTransform, "transform3D", "Has a 3d transform"},
{CompositingReasonVideo, "video", "Is an accelerated video"},
{CompositingReasonCanvas, "canvas",
"Is an accelerated canvas, or is a display list backed canvas that was "
"promoted to a layer based on a performance heuristic."},
{CompositingReasonPlugin, "plugin", "Is an accelerated plugin"},
{CompositingReasonIFrame, "iFrame", "Is an accelerated iFrame"},
{CompositingReasonBackfaceVisibilityHidden, "backfaceVisibilityHidden",
"Has backface-visibility: hidden"},
{CompositingReasonActiveAnimation, "activeAnimation",
"Has an active accelerated animation or transition"},
{CompositingReasonTransitionProperty, "transitionProperty",
"Has an acceleratable transition property (active or inactive)"},
{CompositingReasonScrollDependentPosition, "scrollDependentPosition",
"Is fixed or sticky position"},
{CompositingReasonOverflowScrollingTouch, "overflowScrollingTouch",
"Is a scrollable overflow element"},
{CompositingReasonOverflowScrollingParent, "overflowScrollingParent",
"Scroll parent is not an ancestor"},
{CompositingReasonOutOfFlowClipping, "outOfFlowClipping",
"Has clipping ancestor"},
{CompositingReasonVideoOverlay, "videoOverlay",
"Is overlay controls for video"},
{CompositingReasonWillChangeCompositingHint, "willChange",
"Has a will-change compositing hint"},
{CompositingReasonBackdropFilter, "backdropFilter",
"Has a backdrop filter"},
{CompositingReasonCompositorProxy, "compositorProxy",
"Has a CompositorProxy object"},
{CompositingReasonAssumedOverlap, "assumedOverlap",
"Might overlap other composited content"},
{CompositingReasonOverlap, "overlap", "Overlaps other composited content"},
{CompositingReasonNegativeZIndexChildren, "negativeZIndexChildren",
"Parent with composited negative z-index content"},
{CompositingReasonSquashingDisallowed, "squashingDisallowed",
"Layer was separately composited because it could not be squashed."},
{CompositingReasonTransformWithCompositedDescendants,
"transformWithCompositedDescendants",
"Has a transform that needs to be known by compositor because of "
"composited descendants"},
{CompositingReasonOpacityWithCompositedDescendants,
"opacityWithCompositedDescendants",
"Has opacity that needs to be applied by compositor because of composited "
"descendants"},
{CompositingReasonMaskWithCompositedDescendants,
"maskWithCompositedDescendants",
"Has a mask that needs to be known by compositor because of composited "
"descendants"},
{CompositingReasonReflectionWithCompositedDescendants,
"reflectionWithCompositedDescendants",
"Has a reflection that needs to be known by compositor because of "
"composited descendants"},
{CompositingReasonFilterWithCompositedDescendants,
"filterWithCompositedDescendants",
"Has a filter effect that needs to be known by compositor because of "
"composited descendants"},
{CompositingReasonBlendingWithCompositedDescendants,
"blendingWithCompositedDescendants",
"Has a blending effect that needs to be known by compositor because of "
"composited descendants"},
{CompositingReasonClipsCompositingDescendants,
"clipsCompositingDescendants",
"Has a clip that needs to be known by compositor because of composited "
"descendants"},
{CompositingReasonPerspectiveWith3DDescendants,
"perspectiveWith3DDescendants",
"Has a perspective transform that needs to be known by compositor because "
"of 3d descendants"},
{CompositingReasonPreserve3DWith3DDescendants,
"preserve3DWith3DDescendants",
"Has a preserves-3d property that needs to be known by compositor because "
"of 3d descendants"},
{CompositingReasonReflectionOfCompositedParent,
"reflectionOfCompositedParent", "Is a reflection of a composited layer"},
{CompositingReasonIsolateCompositedDescendants,
"isolateCompositedDescendants",
"Should isolate descendants to apply a blend effect"},
{CompositingReasonPositionFixedWithCompositedDescendants,
"positionFixedWithCompositedDescendants"
"Is a position:fixed element with composited descendants"},
{CompositingReasonRoot, "root", "Is the root layer"},
{CompositingReasonLayerForAncestorClip, "layerForAncestorClip",
"Secondary layer, applies a clip due to a sibling in the compositing "
"tree"},
{CompositingReasonLayerForDescendantClip, "layerForDescendantClip",
"Secondary layer, to clip descendants of the owning layer"},
{CompositingReasonLayerForPerspective, "layerForPerspective",
"Secondary layer, to house the perspective transform for all descendants"},
{CompositingReasonLayerForHorizontalScrollbar,
"layerForHorizontalScrollbar",
"Secondary layer, the horizontal scrollbar layer"},
{CompositingReasonLayerForVerticalScrollbar, "layerForVerticalScrollbar",
"Secondary layer, the vertical scrollbar layer"},
{CompositingReasonLayerForOverflowControlsHost,
"layerForOverflowControlsHost",
"Secondary layer, the overflow controls host layer"},
{CompositingReasonLayerForScrollCorner, "layerForScrollCorner",
"Secondary layer, the scroll corner layer"},
{CompositingReasonLayerForScrollingContents, "layerForScrollingContents",
"Secondary layer, to house contents that can be scrolled"},
{CompositingReasonLayerForScrollingContainer, "layerForScrollingContainer",
"Secondary layer, used to position the scrolling contents while "
"scrolling"},
{CompositingReasonLayerForSquashingContents, "layerForSquashingContents",
"Secondary layer, home for a group of squashable content"},
{CompositingReasonLayerForSquashingContainer, "layerForSquashingContainer",
"Secondary layer, no-op layer to place the squashing layer correctly in "
"the composited layer tree"},
{CompositingReasonLayerForForeground, "layerForForeground",
"Secondary layer, to contain any normal flow and positive z-index "
"contents on top of a negative z-index layer"},
{CompositingReasonLayerForBackground, "layerForBackground",
"Secondary layer, to contain acceleratable background content"},
{CompositingReasonLayerForMask, "layerForMask",
"Secondary layer, to contain the mask contents"},
{CompositingReasonLayerForClippingMask, "layerForClippingMask",
"Secondary layer, for clipping mask"},
{CompositingReasonLayerForAncestorClippingMask,
"layerForAncestorClippingMask",
"Secondary layer, applies a clipping mask due to a sibling in the "
"composited layer tree"},
{CompositingReasonLayerForScrollingBlockSelection,
"layerForScrollingBlockSelection",
"Secondary layer, to house block selection gaps for composited scrolling "
"with no scrolling contents"},
{CompositingReasonLayerForDecoration, "layerForDecoration",
"Layer painted on top of other layers as decoration"},
{CompositingReasonInlineTransform, "inlineTransform",
"Has an inline transform, which causes subsequent layers to assume "
"overlap"},
};
const size_t kNumberOfCompositingReasons =
WTF_ARRAY_LENGTH(kCompositingReasonStringMap);
String compositingReasonsAsString(CompositingReasons reasons) {
if (!reasons)
return "none";
StringBuilder builder;
for (size_t i = 0; i < kNumberOfCompositingReasons; ++i) {
if (reasons & kCompositingReasonStringMap[i].reason) {
if (builder.length())
builder.append(',');
builder.append(kCompositingReasonStringMap[i].shortName);
}
}
return builder.toString();
}
} // namespace blink
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