cc/CCLayerTreeHostCommon.cpp - Issue 11122003: [cc] Rename all cc/ filenames to Chromium style

Unified Diff: cc/CCLayerTreeHostCommon.cpp

Issue 11122003: [cc] Rename all cc/ filenames to Chromium style (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: Created 8 years, 2 months ago

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Index: cc/CCLayerTreeHostCommon.cpp

diff --git a/cc/CCLayerTreeHostCommon.cpp b/cc/CCLayerTreeHostCommon.cpp

deleted file mode 100644

index 24274a6f6f59f4213fdfc1fe73a6070a74b84329..0000000000000000000000000000000000000000

--- a/cc/CCLayerTreeHostCommon.cpp

+++ /dev/null

@@ -1,865 +0,0 @@

-// Use of this source code is governed by a BSD-style license that can be

-// found in the LICENSE file.

-#include "config.h"

-#include "CCLayerTreeHostCommon.h"

-#include "CCLayerImpl.h"

-#include "CCLayerIterator.h"

-#include "CCLayerSorter.h"

-#include "CCMathUtil.h"

-#include "CCRenderSurface.h"

-#include "FloatQuad.h"

-#include "IntRect.h"

-#include "LayerChromium.h"

-#include "RenderSurfaceChromium.h"

-#include <public/WebTransformationMatrix.h>

-using WebKit::WebTransformationMatrix;

-namespace cc {

-CCScrollAndScaleSet::CCScrollAndScaleSet()

-CCScrollAndScaleSet::~CCScrollAndScaleSet()

-IntRect CCLayerTreeHostCommon::calculateVisibleRect(const IntRect& targetSurfaceRect, const IntRect& layerBoundRect, const WebTransformationMatrix& transform)

- // Is this layer fully contained within the target surface?

- IntRect layerInSurfaceSpace = CCMathUtil::mapClippedRect(transform, layerBoundRect);

- if (targetSurfaceRect.contains(layerInSurfaceSpace))

- return layerBoundRect;

- // If the layer doesn't fill up the entire surface, then find the part of

- // the surface rect where the layer could be visible. This avoids trying to

- // project surface rect points that are behind the projection point.

- IntRect minimalSurfaceRect = targetSurfaceRect;

- minimalSurfaceRect.intersect(layerInSurfaceSpace);

- // Project the corners of the target surface rect into the layer space.

- // This bounding rectangle may be larger than it needs to be (being

- // axis-aligned), but is a reasonable filter on the space to consider.

- // Non-invertible transforms will create an empty rect here.

- const WebTransformationMatrix surfaceToLayer = transform.inverse();

- IntRect layerRect = enclosingIntRect(CCMathUtil::projectClippedRect(surfaceToLayer, FloatRect(minimalSurfaceRect)));

- layerRect.intersect(layerBoundRect);

- return layerRect;

-template<typename LayerType>

-static inline bool layerIsInExisting3DRenderingContext(LayerType* layer)

- // According to current W3C spec on CSS transforms, a layer is part of an established

- // 3d rendering context if its parent has transform-style of preserves-3d.

- return layer->parent() && layer->parent()->preserves3D();

-template<typename LayerType>

-static bool layerIsRootOfNewRenderingContext(LayerType* layer)

- // According to current W3C spec on CSS transforms (Section 6.1), a layer is the

- // beginning of 3d rendering context if its parent does not have transform-style:

- // preserve-3d, but this layer itself does.

- if (layer->parent())

- return !layer->parent()->preserves3D() && layer->preserves3D();

- return layer->preserves3D();

-template<typename LayerType>

-static bool isLayerBackFaceVisible(LayerType* layer)

- // The current W3C spec on CSS transforms says that backface visibility should be

- // determined differently depending on whether the layer is in a "3d rendering

- // context" or not. For Chromium code, we can determine whether we are in a 3d

- // rendering context by checking if the parent preserves 3d.

- if (layerIsInExisting3DRenderingContext(layer))

- return layer->drawTransform().isBackFaceVisible();

- // In this case, either the layer establishes a new 3d rendering context, or is not in

- // a 3d rendering context at all.

- return layer->transform().isBackFaceVisible();

-template<typename LayerType>

-static bool isSurfaceBackFaceVisible(LayerType* layer, const WebTransformationMatrix& drawTransform)

- if (layerIsInExisting3DRenderingContext(layer))

- return drawTransform.isBackFaceVisible();

- if (layerIsRootOfNewRenderingContext(layer))

- return layer->transform().isBackFaceVisible();

- // If the renderSurface is not part of a new or existing rendering context, then the

- // layers that contribute to this surface will decide back-face visibility for themselves.

- return false;

-template<typename LayerType>

-static inline bool layerClipsSubtree(LayerType* layer)

- return layer->masksToBounds() || layer->maskLayer();

-template<typename LayerType>

-static IntRect calculateVisibleContentRect(LayerType* layer)

- ASSERT(layer->renderTarget());

- // Nothing is visible if the layer bounds are empty.

- if (!layer->drawsContent() || layer->contentBounds().isEmpty() || layer->drawableContentRect().isEmpty())

- return IntRect();

- IntRect targetSurfaceClipRect;

- // First, compute visible bounds in target surface space.

- if (layer->renderTarget()->renderSurface()->clipRect().isEmpty())

- targetSurfaceClipRect = layer->drawableContentRect();

- else {

- // In this case the target surface does clip layers that contribute to it. So, we

- // have convert the current surface's clipRect from its ancestor surface space to

- // the current surface space.

- targetSurfaceClipRect = enclosingIntRect(CCMathUtil::projectClippedRect(layer->renderTarget()->renderSurface()->drawTransform().inverse(), layer->renderTarget()->renderSurface()->clipRect()));

- targetSurfaceClipRect.intersect(layer->drawableContentRect());

- }

- if (targetSurfaceClipRect.isEmpty())

- return IntRect();

- return CCLayerTreeHostCommon::calculateVisibleRect(targetSurfaceClipRect, IntRect(IntPoint(), layer->contentBounds()), layer->drawTransform());

-static bool isScaleOrTranslation(const WebTransformationMatrix& m)

- return !m.m12() && !m.m13() && !m.m14()

- && !m.m21() && !m.m23() && !m.m24()

- && !m.m31() && !m.m32() && !m.m43()

- && m.m44();

-static inline bool transformToParentIsKnown(CCLayerImpl*)

- return true;

-static inline bool transformToParentIsKnown(LayerChromium* layer)

- return !layer->transformIsAnimating();

-static inline bool transformToScreenIsKnown(CCLayerImpl*)

- return true;

-static inline bool transformToScreenIsKnown(LayerChromium* layer)

- return !layer->screenSpaceTransformIsAnimating();

-template<typename LayerType>

-static bool layerShouldBeSkipped(LayerType* layer)

- // Layers can be skipped if any of these conditions are met.

- // - does not draw content.

- // - is transparent

- // - has empty bounds

- // - the layer is not double-sided, but its back face is visible.

- //

- // Some additional conditions need to be computed at a later point after the recursion is finished.

- // - the intersection of render surface content and layer clipRect is empty

- // - the visibleContentRect is empty

- //

- // Note, if the layer should not have been drawn due to being fully transparent,

- // we would have skipped the entire subtree and never made it into this function,

- // so it is safe to omit this check here.

- if (!layer->drawsContent() || layer->bounds().isEmpty())

- return true;

- LayerType* backfaceTestLayer = layer;

- if (layer->useParentBackfaceVisibility()) {

- ASSERT(layer->parent());

- ASSERT(!layer->parent()->useParentBackfaceVisibility());

- backfaceTestLayer = layer->parent();

- }

- // The layer should not be drawn if (1) it is not double-sided and (2) the back of the layer is known to be facing the screen.

- if (!backfaceTestLayer->doubleSided() && transformToScreenIsKnown(backfaceTestLayer) && isLayerBackFaceVisible(backfaceTestLayer))

- return true;

- return false;

-static inline bool subtreeShouldBeSkipped(CCLayerImpl* layer)

- // The opacity of a layer always applies to its children (either implicitly

- // via a render surface or explicitly if the parent preserves 3D), so the

- // entire subtree can be skipped if this layer is fully transparent.

- return !layer->opacity();

-static inline bool subtreeShouldBeSkipped(LayerChromium* layer)

- // If the opacity is being animated then the opacity on the main thread is unreliable

- // (since the impl thread may be using a different opacity), so it should not be trusted.

- // In particular, it should not cause the subtree to be skipped.

- return !layer->opacity() && !layer->opacityIsAnimating();

-template<typename LayerType>

-static bool subtreeShouldRenderToSeparateSurface(LayerType* layer, bool axisAlignedWithRespectToParent)

- // The root layer has a special render surface that is set up externally, so

- // it shouldn't be treated as a surface in this code.

- if (!layer->parent())

- return false;

- // Cache this value, because otherwise it walks the entire subtree several times.

- bool descendantDrawsContent = layer->descendantDrawsContent();

- //

- // A layer and its descendants should render onto a new RenderSurface if any of these rules hold:

- //

- // If we force it.

- if (layer->forceRenderSurface())

- return true;

- // If the layer uses a mask.

- if (layer->maskLayer())

- return true;

- // If the layer has a reflection.

- if (layer->replicaLayer())

- return true;

- // If the layer uses a CSS filter.

- if (!layer->filters().isEmpty() || !layer->backgroundFilters().isEmpty())

- return true;

- // If the layer flattens its subtree (i.e. the layer doesn't preserve-3d), but it is

- // treated as a 3D object by its parent (i.e. parent does preserve-3d).

- if (layerIsInExisting3DRenderingContext(layer) && !layer->preserves3D() && descendantDrawsContent)

- return true;

- // If the layer clips its descendants but it is not axis-aligned with respect to its parent.

- if (layerClipsSubtree(layer) && !axisAlignedWithRespectToParent && descendantDrawsContent)

- return true;

- // If the layer has opacity != 1 and does not have a preserves-3d transform style.

- if (layer->opacity() != 1 && !layer->preserves3D() && descendantDrawsContent)

- return true;

- return false;

-WebTransformationMatrix computeScrollCompensationForThisLayer(CCLayerImpl* scrollingLayer, const WebTransformationMatrix& parentMatrix)

- // For every layer that has non-zero scrollDelta, we have to compute a transform that can undo the

- // scrollDelta translation. In particular, we want this matrix to premultiply a fixed-position layer's

- // parentMatrix, so we design this transform in three steps as follows. The steps described here apply

- // from right-to-left, so Step 1 would be the right-most matrix:

- //

- // Step 1. transform from target surface space to the exact space where scrollDelta is actually applied.

- // -- this is inverse of the matrix in step 3

- // Step 2. undo the scrollDelta

- // -- this is just a translation by scrollDelta.

- // Step 3. transform back to target surface space.

- // -- this transform is the "partialLayerOriginTransform" = (parentMatrix * scale(layer->pageScaleDelta()));

- //

- // These steps create a matrix that both start and end in targetSurfaceSpace. So this matrix can

- // pre-multiply any fixed-position layer's drawTransform to undo the scrollDeltas -- as long as

- // that fixed position layer is fixed onto the same renderTarget as this scrollingLayer.

- //

- WebTransformationMatrix partialLayerOriginTransform = parentMatrix;

- partialLayerOriginTransform.multiply(scrollingLayer->implTransform());

- WebTransformationMatrix scrollCompensationForThisLayer = partialLayerOriginTransform; // Step 3

- scrollCompensationForThisLayer.translate(scrollingLayer->scrollDelta().width(), scrollingLayer->scrollDelta().height()); // Step 2

- scrollCompensationForThisLayer.multiply(partialLayerOriginTransform.inverse()); // Step 1

- return scrollCompensationForThisLayer;

-WebTransformationMatrix computeScrollCompensationMatrixForChildren(LayerChromium* currentLayer, const WebTransformationMatrix& currentParentMatrix, const WebTransformationMatrix& currentScrollCompensation)

- // The main thread (i.e. LayerChromium) does not need to worry about scroll compensation.

- // So we can just return an identity matrix here.

- return WebTransformationMatrix();

-WebTransformationMatrix computeScrollCompensationMatrixForChildren(CCLayerImpl* layer, const WebTransformationMatrix& parentMatrix, const WebTransformationMatrix& currentScrollCompensationMatrix)

- // "Total scroll compensation" is the transform needed to cancel out all scrollDelta translations that

- // occurred since the nearest container layer, even if there are renderSurfaces in-between.

- //

- // There are some edge cases to be aware of, that are not explicit in the code:

- // - A layer that is both a fixed-position and container should not be its own container, instead, that means

- // it is fixed to an ancestor, and is a container for any fixed-position descendants.

- // - A layer that is a fixed-position container and has a renderSurface should behave the same as a container

- // without a renderSurface, the renderSurface is irrelevant in that case.

- // - A layer that does not have an explicit container is simply fixed to the viewport

- // (i.e. the root renderSurface, and it would still compensate for root layer's scrollDelta).

- // - If the fixed-position layer has its own renderSurface, then the renderSurface is

- // the one who gets fixed.

- //

- // This function needs to be called AFTER layers create their own renderSurfaces.

- //

- // Avoid the overheads (including stack allocation and matrix initialization/copy) if we know that the scroll compensation doesn't need to be reset or adjusted.

- if (!layer->isContainerForFixedPositionLayers() && layer->scrollDelta().isZero() && !layer->renderSurface())

- return currentScrollCompensationMatrix;

- // Start as identity matrix.

- WebTransformationMatrix nextScrollCompensationMatrix;

- // If this layer is not a container, then it inherits the existing scroll compensations.

- if (!layer->isContainerForFixedPositionLayers())

- nextScrollCompensationMatrix = currentScrollCompensationMatrix;

- // If the current layer has a non-zero scrollDelta, then we should compute its local scrollCompensation

- // and accumulate it to the nextScrollCompensationMatrix.

- if (!layer->scrollDelta().isZero()) {

- WebTransformationMatrix scrollCompensationForThisLayer = computeScrollCompensationForThisLayer(layer, parentMatrix);

- nextScrollCompensationMatrix.multiply(scrollCompensationForThisLayer);

- }

- // If the layer created its own renderSurface, we have to adjust nextScrollCompensationMatrix.

- // The adjustment allows us to continue using the scrollCompensation on the next surface.

- // Step 1 (right-most in the math): transform from the new surface to the original ancestor surface

- // Step 2: apply the scroll compensation

- // Step 3: transform back to the new surface.

- if (layer->renderSurface() && !nextScrollCompensationMatrix.isIdentity())

- nextScrollCompensationMatrix = layer->renderSurface()->drawTransform().inverse() * nextScrollCompensationMatrix * layer->renderSurface()->drawTransform();

- return nextScrollCompensationMatrix;

-// Should be called just before the recursive calculateDrawTransformsInternal().

-template<typename LayerType, typename LayerList>

-void setupRootLayerAndSurfaceForRecursion(LayerType* rootLayer, LayerList& renderSurfaceLayerList, const IntSize& deviceViewportSize)

- if (!rootLayer->renderSurface())

- rootLayer->createRenderSurface();

- rootLayer->renderSurface()->setContentRect(IntRect(IntPoint::zero(), deviceViewportSize));

- rootLayer->renderSurface()->clearLayerLists();

- ASSERT(renderSurfaceLayerList.empty());

- renderSurfaceLayerList.push_back(rootLayer);

-// Recursively walks the layer tree starting at the given node and computes all the

-// necessary transformations, clipRects, render surfaces, etc.

-template<typename LayerType, typename LayerList, typename RenderSurfaceType, typename LayerSorter>

-static void calculateDrawTransformsInternal(LayerType* layer, LayerType* rootLayer, const WebTransformationMatrix& parentMatrix,

- const WebTransformationMatrix& fullHierarchyMatrix, const WebTransformationMatrix& currentScrollCompensationMatrix,

- const IntRect& clipRectFromAncestor, bool ancestorClipsSubtree,

- RenderSurfaceType* nearestAncestorThatMovesPixels, LayerList& renderSurfaceLayerList, LayerList& layerList,

- LayerSorter* layerSorter, int maxTextureSize, float deviceScaleFactor, IntRect& drawableContentRectOfSubtree)

- // This function computes the new matrix transformations recursively for this

- // layer and all its descendants. It also computes the appropriate render surfaces.

- // Some important points to remember:

- //

- // 0. Here, transforms are notated in Matrix x Vector order, and in words we describe what

- // the transform does from left to right.

- //

- // 1. In our terminology, the "layer origin" refers to the top-left corner of a layer, and the

- // positive Y-axis points downwards. This interpretation is valid because the orthographic

- // projection applied at draw time flips the Y axis appropriately.

- //

- // 2. The anchor point, when given as a FloatPoint object, is specified in "unit layer space",

- // where the bounds of the layer map to [0, 1]. However, as a WebTransformationMatrix object,

- // the transform to the anchor point is specified in "layer space", where the bounds

- // of the layer map to [bounds.width(), bounds.height()].

- //

- // 3. Definition of various transforms used:

- // M[parent] is the parent matrix, with respect to the nearest render surface, passed down recursively.

- // M[root] is the full hierarchy, with respect to the root, passed down recursively.

- // Tr[origin] is the translation matrix from the parent's origin to this layer's origin.

- // Tr[origin2anchor] is the translation from the layer's origin to its anchor point

- // Tr[origin2center] is the translation from the layer's origin to its center

- // M[layer] is the layer's matrix (applied at the anchor point)

- // M[sublayer] is the layer's sublayer transform (applied at the layer's center)

- // S[layer2content] is the ratio of a layer's contentBounds() to its bounds().

- //

- // Some composite transforms can help in understanding the sequence of transforms:

- // compositeLayerTransform = Tr[origin2anchor] * M[layer] * Tr[origin2anchor].inverse()

- // compositeSublayerTransform = Tr[origin2center] * M[sublayer] * Tr[origin2center].inverse()

- //

- // In words, the layer transform is applied about the anchor point, and the sublayer transform is

- // applied about the center of the layer.

- //

- // 4. When a layer (or render surface) is drawn, it is drawn into a "target render surface". Therefore the draw

- // transform does not necessarily transform from screen space to local layer space. Instead, the draw transform

- // is the transform between the "target render surface space" and local layer space. Note that render surfaces,

- // except for the root, also draw themselves into a different target render surface, and so their draw

- // transform and origin transforms are also described with respect to the target.

- //

- // Using these definitions, then:

- //

- // The draw transform for the layer is:

- // M[draw] = M[parent] * Tr[origin] * compositeLayerTransform * S[layer2content]

- // = M[parent] * Tr[layer->position() + anchor] * M[layer] * Tr[anchor2origin] * S[layer2content]

- //

- // Interpreting the math left-to-right, this transforms from the layer's render surface to the origin of the layer in content space.

- //

- // The screen space transform is:

- // M[screenspace] = M[root] * Tr[origin] * compositeLayerTransform * S[layer2content]

- // = M[root] * Tr[layer->position() + anchor] * M[layer] * Tr[anchor2origin] * S[layer2content]

- //

- // Interpreting the math left-to-right, this transforms from the root render surface's content space to the local layer's origin in layer space.

- //

- // The transform hierarchy that is passed on to children (i.e. the child's parentMatrix) is:

- // M[parent]_for_child = M[parent] * Tr[origin] * compositeLayerTransform * compositeSublayerTransform

- // = M[parent] * Tr[layer->position() + anchor] * M[layer] * Tr[anchor2origin] * compositeSublayerTransform

- //

- // and a similar matrix for the full hierarchy with respect to the root.

- //

- // Finally, note that the final matrix used by the shader for the layer is P * M[draw] * S . This final product

- // is computed in drawTexturedQuad(), where:

- // P is the projection matrix

- // S is the scale adjustment (to scale up a canonical quad to the layer's size)

- //

- // When a render surface has a replica layer, that layer's transform is used to draw a second copy of the surface.

- // Transforms named here are relative to the surface, unless they specify they are relative to the replica layer.

- //

- // We will denote a scale by device scale S[deviceScale]

- //

- // The render surface draw transform to its target surface origin is:

- // M[surfaceDraw] = M[owningLayer->Draw]

- //

- // The render surface origin transform to its the root (screen space) origin is:

- // M[surface2root] = M[owningLayer->screenspace] * S[deviceScale].inverse()

- //

- // The replica draw transform to its target surface origin is:

- // M[replicaDraw] = S[deviceScale] * M[surfaceDraw] * Tr[replica->position() + replica->anchor()] * Tr[replica] * Tr[origin2anchor].inverse() * S[contentsScale].inverse()

- //

- // The replica draw transform to the root (screen space) origin is:

- // M[replica2root] = M[surface2root] * Tr[replica->position()] * Tr[replica] * Tr[origin2anchor].inverse()

- //

- // If we early-exit anywhere in this function, the drawableContentRect of this subtree should be considered empty.

- drawableContentRectOfSubtree = IntRect();

- if (subtreeShouldBeSkipped(layer))

- return;

- IntRect clipRectForSubtree;

- bool subtreeShouldBeClipped = false;

- float drawOpacity = layer->opacity();

- bool drawOpacityIsAnimating = layer->opacityIsAnimating();

- if (layer->parent() && layer->parent()->preserves3D()) {

- drawOpacity *= layer->parent()->drawOpacity();

- drawOpacityIsAnimating |= layer->parent()->drawOpacityIsAnimating();

- }

- IntSize bounds = layer->bounds();

- FloatPoint anchorPoint = layer->anchorPoint();

- FloatPoint position = layer->position() - layer->scrollDelta();

- WebTransformationMatrix layerLocalTransform;

- // LT = M[impl transformation]

- layerLocalTransform.multiply(layer->implTransform());

- // LT = M[impl transformation] * Tr[origin] * Tr[origin2anchor]

- layerLocalTransform.translate3d(position.x() + anchorPoint.x() * bounds.width(), position.y() + anchorPoint.y() * bounds.height(), layer->anchorPointZ());

- // LT = M[impl transformation] * Tr[origin] * Tr[origin2anchor] * M[layer]

- layerLocalTransform.multiply(layer->transform());

- // LT = S[impl transformation] * Tr[origin] * Tr[origin2anchor] * M[layer] * Tr[anchor2origin]

- layerLocalTransform.translate3d(-anchorPoint.x() * bounds.width(), -anchorPoint.y() * bounds.height(), -layer->anchorPointZ());

- WebTransformationMatrix combinedTransform = parentMatrix;

- combinedTransform.multiply(layerLocalTransform);

- if (layer->fixedToContainerLayer()) {

- // Special case: this layer is a composited fixed-position layer; we need to

- // explicitly compensate for all ancestors' nonzero scrollDeltas to keep this layer

- // fixed correctly.

- combinedTransform = currentScrollCompensationMatrix * combinedTransform;

- }

- // The drawTransform that gets computed below is effectively the layer's drawTransform, unless

- // the layer itself creates a renderSurface. In that case, the renderSurface re-parents the transforms.

- WebTransformationMatrix drawTransform = combinedTransform;

- if (!layer->contentBounds().isEmpty() && !layer->bounds().isEmpty()) {

- // M[draw] = M[parent] * LT * S[layer2content]

- drawTransform.scaleNonUniform(layer->bounds().width() / static_cast<double>(layer->contentBounds().width()),

- layer->bounds().height() / static_cast<double>(layer->contentBounds().height()));

- }

- // layerScreenSpaceTransform represents the transform between root layer's "screen space" and local content space.

- WebTransformationMatrix layerScreenSpaceTransform = fullHierarchyMatrix;

- if (!layer->preserves3D())

- CCMathUtil::flattenTransformTo2d(layerScreenSpaceTransform);

- layerScreenSpaceTransform.multiply(drawTransform);

- layer->setScreenSpaceTransform(layerScreenSpaceTransform);

- bool animatingTransformToTarget = layer->transformIsAnimating();

- bool animatingTransformToScreen = animatingTransformToTarget;

- if (layer->parent()) {

- animatingTransformToTarget |= layer->parent()->drawTransformIsAnimating();

- animatingTransformToScreen |= layer->parent()->screenSpaceTransformIsAnimating();

- }

- FloatRect contentRect(FloatPoint(), layer->contentBounds());

- // fullHierarchyMatrix is the matrix that transforms objects between screen space (except projection matrix) and the most recent RenderSurface's space.

- // nextHierarchyMatrix will only change if this layer uses a new RenderSurface, otherwise remains the same.

- WebTransformationMatrix nextHierarchyMatrix = fullHierarchyMatrix;

- WebTransformationMatrix sublayerMatrix;

- if (subtreeShouldRenderToSeparateSurface(layer, isScaleOrTranslation(combinedTransform))) {

- // Check back-face visibility before continuing with this surface and its subtree

- if (!layer->doubleSided() && transformToParentIsKnown(layer) && isSurfaceBackFaceVisible(layer, combinedTransform))

- return;

- if (!layer->renderSurface())

- layer->createRenderSurface();

- RenderSurfaceType* renderSurface = layer->renderSurface();

- renderSurface->clearLayerLists();

- // The origin of the new surface is the upper left corner of the layer.

- renderSurface->setDrawTransform(drawTransform);

- WebTransformationMatrix layerDrawTransform;

- layerDrawTransform.scale(deviceScaleFactor);

- if (!layer->contentBounds().isEmpty() && !layer->bounds().isEmpty()) {

- layerDrawTransform.scaleNonUniform(layer->bounds().width() / static_cast<double>(layer->contentBounds().width()),

- layer->bounds().height() / static_cast<double>(layer->contentBounds().height()));

- }

- layer->setDrawTransform(layerDrawTransform);

- // The sublayer matrix transforms centered layer rects into target

- // surface content space.

- sublayerMatrix.makeIdentity();

- sublayerMatrix.scale(deviceScaleFactor);

- // The opacity value is moved from the layer to its surface, so that the entire subtree properly inherits opacity.

- renderSurface->setDrawOpacity(drawOpacity);

- renderSurface->setDrawOpacityIsAnimating(drawOpacityIsAnimating);

- layer->setDrawOpacity(1);

- layer->setDrawOpacityIsAnimating(false);

- renderSurface->setTargetSurfaceTransformsAreAnimating(animatingTransformToTarget);

- renderSurface->setScreenSpaceTransformsAreAnimating(animatingTransformToScreen);

- animatingTransformToTarget = false;

- layer->setDrawTransformIsAnimating(animatingTransformToTarget);

- layer->setScreenSpaceTransformIsAnimating(animatingTransformToScreen);

- // Update the aggregate hierarchy matrix to include the transform of the

- // newly created RenderSurface.

- nextHierarchyMatrix.multiply(renderSurface->drawTransform());

- // The new renderSurface here will correctly clip the entire subtree. So, we do

- // not need to continue propagating the clipping state further down the tree. This

- // way, we can avoid transforming clipRects from ancestor target surface space to

- // current target surface space that could cause more w < 0 headaches.

- subtreeShouldBeClipped = false;

- if (layer->maskLayer()) {

- layer->maskLayer()->setRenderTarget(layer);

- layer->maskLayer()->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));

- }

- if (layer->replicaLayer() && layer->replicaLayer()->maskLayer()) {

- layer->replicaLayer()->maskLayer()->setRenderTarget(layer);

- layer->replicaLayer()->maskLayer()->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));

- }

- if (layer->filters().hasFilterThatMovesPixels())

- nearestAncestorThatMovesPixels = renderSurface;

- // The render surface clipRect is expressed in the space where this surface draws, i.e. the same space as clipRectFromAncestor.

- if (ancestorClipsSubtree)

- renderSurface->setClipRect(clipRectFromAncestor);

- else

- renderSurface->setClipRect(IntRect());

- renderSurface->setNearestAncestorThatMovesPixels(nearestAncestorThatMovesPixels);

- renderSurfaceLayerList.push_back(layer);

- } else {

- layer->setDrawTransform(drawTransform);

- layer->setDrawTransformIsAnimating(animatingTransformToTarget);

- layer->setScreenSpaceTransformIsAnimating(animatingTransformToScreen);

- sublayerMatrix = combinedTransform;

- layer->setDrawOpacity(drawOpacity);

- layer->setDrawOpacityIsAnimating(drawOpacityIsAnimating);

- if (layer != rootLayer) {

- ASSERT(layer->parent());

- layer->clearRenderSurface();

- // Layers without renderSurfaces directly inherit the ancestor's clip status.

- subtreeShouldBeClipped = ancestorClipsSubtree;

- if (ancestorClipsSubtree)

- clipRectForSubtree = clipRectFromAncestor;

- // Layers that are not their own renderTarget will render into the target of their nearest ancestor.

- layer->setRenderTarget(layer->parent()->renderTarget());

- } else {

- // FIXME: This root layer special case code should eventually go away. https://bugs.webkit.org/show_bug.cgi?id=92290

- ASSERT(!layer->parent());

- ASSERT(layer->renderSurface());

- ASSERT(ancestorClipsSubtree);

- layer->renderSurface()->setClipRect(clipRectFromAncestor);

- subtreeShouldBeClipped = false;

- }

- IntRect rectInTargetSpace = enclosingIntRect(CCMathUtil::mapClippedRect(layer->drawTransform(), contentRect));

- if (layerClipsSubtree(layer)) {

- subtreeShouldBeClipped = true;

- if (ancestorClipsSubtree && !layer->renderSurface()) {

- clipRectForSubtree = clipRectFromAncestor;

- clipRectForSubtree.intersect(rectInTargetSpace);

- } else

- clipRectForSubtree = rectInTargetSpace;

- }

- // Flatten to 2D if the layer doesn't preserve 3D.

- if (!layer->preserves3D())

- CCMathUtil::flattenTransformTo2d(sublayerMatrix);

- // Apply the sublayer transform at the center of the layer.

- sublayerMatrix.translate(0.5 * bounds.width(), 0.5 * bounds.height());

- sublayerMatrix.multiply(layer->sublayerTransform());

- sublayerMatrix.translate(-0.5 * bounds.width(), -0.5 * bounds.height());

- LayerList& descendants = (layer->renderSurface() ? layer->renderSurface()->layerList() : layerList);

- // Any layers that are appended after this point are in the layer's subtree and should be included in the sorting process.

- unsigned sortingStartIndex = descendants.size();

- if (!layerShouldBeSkipped(layer))

- descendants.push_back(layer);

- WebTransformationMatrix nextScrollCompensationMatrix = computeScrollCompensationMatrixForChildren(layer, parentMatrix, currentScrollCompensationMatrix);;

- IntRect accumulatedDrawableContentRectOfChildren;

- for (size_t i = 0; i < layer->children().size(); ++i) {

- LayerType* child = CCLayerTreeHostCommon::getChildAsRawPtr(layer->children(), i);

- IntRect drawableContentRectOfChildSubtree;

- calculateDrawTransformsInternal<LayerType, LayerList, RenderSurfaceType, LayerSorter>(child, rootLayer, sublayerMatrix, nextHierarchyMatrix, nextScrollCompensationMatrix,

- clipRectForSubtree, subtreeShouldBeClipped, nearestAncestorThatMovesPixels,

- renderSurfaceLayerList, descendants, layerSorter, maxTextureSize, deviceScaleFactor, drawableContentRectOfChildSubtree);

- if (!drawableContentRectOfChildSubtree.isEmpty()) {

- accumulatedDrawableContentRectOfChildren.unite(drawableContentRectOfChildSubtree);

- if (child->renderSurface())

- descendants.push_back(child);

- }

- // Compute the total drawableContentRect for this subtree (the rect is in targetSurface space)

- IntRect localDrawableContentRectOfSubtree = accumulatedDrawableContentRectOfChildren;

- if (layer->drawsContent())

- localDrawableContentRectOfSubtree.unite(rectInTargetSpace);

- if (subtreeShouldBeClipped)

- localDrawableContentRectOfSubtree.intersect(clipRectForSubtree);

- // Compute the layer's drawable content rect (the rect is in targetSurface space)

- IntRect drawableContentRectOfLayer = rectInTargetSpace;

- if (subtreeShouldBeClipped)

- drawableContentRectOfLayer.intersect(clipRectForSubtree);

- layer->setDrawableContentRect(drawableContentRectOfLayer);

- // Compute the layer's visible content rect (the rect is in content space)

- IntRect visibleContentRectOfLayer = calculateVisibleContentRect(layer);

- layer->setVisibleContentRect(visibleContentRectOfLayer);

- // Compute the remaining properties for the render surface, if the layer has one.

- if (layer->renderSurface() && layer != rootLayer) {

- RenderSurfaceType* renderSurface = layer->renderSurface();

- IntRect clippedContentRect = localDrawableContentRectOfSubtree;

- // Don't clip if the layer is reflected as the reflection shouldn't be

- // clipped. If the layer is animating, then the surface's transform to

- // its target is not known on the main thread, and we should not use it

- // to clip.

- if (!layer->replicaLayer() && transformToParentIsKnown(layer)) {

- // Note, it is correct to use ancestorClipsSubtree here, because we are looking at this layer's renderSurface, not the layer itself.

- if (ancestorClipsSubtree && !clippedContentRect.isEmpty()) {

- IntRect surfaceClipRect = CCLayerTreeHostCommon::calculateVisibleRect(renderSurface->clipRect(), clippedContentRect, renderSurface->drawTransform());

- clippedContentRect.intersect(surfaceClipRect);

- }

- // The RenderSurface backing texture cannot exceed the maximum supported

- // texture size.

- clippedContentRect.setWidth(std::min(clippedContentRect.width(), maxTextureSize));

- clippedContentRect.setHeight(std::min(clippedContentRect.height(), maxTextureSize));

- if (clippedContentRect.isEmpty())

- renderSurface->clearLayerLists();

- renderSurface->setContentRect(clippedContentRect);

- renderSurface->setScreenSpaceTransform(layer->screenSpaceTransform());

- if (layer->replicaLayer()) {

- WebTransformationMatrix surfaceOriginToReplicaOriginTransform;

- surfaceOriginToReplicaOriginTransform.scale(deviceScaleFactor);

- surfaceOriginToReplicaOriginTransform.translate(layer->replicaLayer()->position().x() + layer->replicaLayer()->anchorPoint().x() * bounds.width(),

- layer->replicaLayer()->position().y() + layer->replicaLayer()->anchorPoint().y() * bounds.height());

- surfaceOriginToReplicaOriginTransform.multiply(layer->replicaLayer()->transform());

- surfaceOriginToReplicaOriginTransform.translate(-layer->replicaLayer()->anchorPoint().x() * bounds.width(), -layer->replicaLayer()->anchorPoint().y() * bounds.height());

- surfaceOriginToReplicaOriginTransform.scale(1 / deviceScaleFactor);

- // Compute the replica's "originTransform" that maps from the replica's origin space to the target surface origin space.

- WebTransformationMatrix replicaOriginTransform = layer->renderSurface()->drawTransform() * surfaceOriginToReplicaOriginTransform;

- renderSurface->setReplicaDrawTransform(replicaOriginTransform);

- // Compute the replica's "screenSpaceTransform" that maps from the replica's origin space to the screen's origin space.

- WebTransformationMatrix replicaScreenSpaceTransform = layer->renderSurface()->screenSpaceTransform() * surfaceOriginToReplicaOriginTransform;

- renderSurface->setReplicaScreenSpaceTransform(replicaScreenSpaceTransform);

- }

- // If a render surface has no layer list, then it and none of its children needed to get drawn.

- if (!layer->renderSurface()->layerList().size()) {

- // FIXME: Originally we asserted that this layer was already at the end of the

- // list, and only needed to remove that layer. For now, we remove the

- // entire subtree of surfaces to fix a crash bug. The root cause is

- // https://bugs.webkit.org/show_bug.cgi?id=74147 and we should be able

- // to put the original assert after fixing that.

- while (renderSurfaceLayerList.back() != layer) {

- renderSurfaceLayerList.back()->clearRenderSurface();

- renderSurfaceLayerList.pop_back();

- }

- ASSERT(renderSurfaceLayerList.back() == layer);

- renderSurfaceLayerList.pop_back();

- layer->clearRenderSurface();

- return;

- }

- // If neither this layer nor any of its children were added, early out.

- if (sortingStartIndex == descendants.size())

- return;

- // If preserves-3d then sort all the descendants in 3D so that they can be

- // drawn from back to front. If the preserves-3d property is also set on the parent then

- // skip the sorting as the parent will sort all the descendants anyway.

- if (descendants.size() && layer->preserves3D() && (!layer->parent() || !layer->parent()->preserves3D()))

- sortLayers(descendants.begin() + sortingStartIndex, descendants.end(), layerSorter);

- if (layer->renderSurface())

- drawableContentRectOfSubtree = enclosingIntRect(layer->renderSurface()->drawableContentRect());

- else

- drawableContentRectOfSubtree = localDrawableContentRectOfSubtree;

- if (layer->hasContributingDelegatedRenderPasses())

- layer->renderTarget()->renderSurface()->addContributingDelegatedRenderPassLayer(layer);

-void CCLayerTreeHostCommon::calculateDrawTransforms(LayerChromium* rootLayer, const IntSize& deviceViewportSize, float deviceScaleFactor, int maxTextureSize, std::vector<scoped_refptr<LayerChromium> >& renderSurfaceLayerList)

- IntRect totalDrawableContentRect;

- WebTransformationMatrix identityMatrix;

- WebTransformationMatrix deviceScaleTransform;

- deviceScaleTransform.scale(deviceScaleFactor);

- setupRootLayerAndSurfaceForRecursion<LayerChromium, std::vector<scoped_refptr<LayerChromium> > >(rootLayer, renderSurfaceLayerList, deviceViewportSize);

- cc::calculateDrawTransformsInternal<LayerChromium, std::vector<scoped_refptr<LayerChromium> >, RenderSurfaceChromium, void>(rootLayer, rootLayer, deviceScaleTransform, identityMatrix, identityMatrix,

- rootLayer->renderSurface()->contentRect(), true, 0, renderSurfaceLayerList,

- rootLayer->renderSurface()->layerList(), 0, maxTextureSize, deviceScaleFactor, totalDrawableContentRect);

-void CCLayerTreeHostCommon::calculateDrawTransforms(CCLayerImpl* rootLayer, const IntSize& deviceViewportSize, float deviceScaleFactor, CCLayerSorter* layerSorter, int maxTextureSize, std::vector<CCLayerImpl*>& renderSurfaceLayerList)

- IntRect totalDrawableContentRect;

- WebTransformationMatrix identityMatrix;

- WebTransformationMatrix deviceScaleTransform;

- deviceScaleTransform.scale(deviceScaleFactor);

- setupRootLayerAndSurfaceForRecursion<CCLayerImpl, std::vector<CCLayerImpl*> >(rootLayer, renderSurfaceLayerList, deviceViewportSize);

- cc::calculateDrawTransformsInternal<CCLayerImpl, std::vector<CCLayerImpl*>, CCRenderSurface, CCLayerSorter>(rootLayer, rootLayer, deviceScaleTransform, identityMatrix, identityMatrix,

- rootLayer->renderSurface()->contentRect(), true, 0, renderSurfaceLayerList,

- rootLayer->renderSurface()->layerList(), layerSorter, maxTextureSize, deviceScaleFactor, totalDrawableContentRect);

-static bool pointHitsRect(const IntPoint& viewportPoint, const WebTransformationMatrix& localSpaceToScreenSpaceTransform, FloatRect localSpaceRect)

- // If the transform is not invertible, then assume that this point doesn't hit this rect.

- if (!localSpaceToScreenSpaceTransform.isInvertible())

- return false;

- // Transform the hit test point from screen space to the local space of the given rect.

- bool clipped = false;

- FloatPoint hitTestPointInLocalSpace = CCMathUtil::projectPoint(localSpaceToScreenSpaceTransform.inverse(), FloatPoint(viewportPoint), clipped);

- // If projectPoint could not project to a valid value, then we assume that this point doesn't hit this rect.

- if (clipped)

- return false;

- return localSpaceRect.contains(hitTestPointInLocalSpace);

-static bool pointIsClippedBySurfaceOrClipRect(const IntPoint& viewportPoint, CCLayerImpl* layer)

- CCLayerImpl* currentLayer = layer;

- // Walk up the layer tree and hit-test any renderSurfaces and any layer clipRects that are active.

- while (currentLayer) {

- if (currentLayer->renderSurface() && !pointHitsRect(viewportPoint, currentLayer->renderSurface()->screenSpaceTransform(), currentLayer->renderSurface()->contentRect()))

- return true;

- // Note that drawableContentRects are actually in targetSurface space, so the transform we

- // have to provide is the target surface's screenSpaceTransform.

- CCLayerImpl* renderTarget = currentLayer->renderTarget();

- if (layerClipsSubtree(currentLayer) && !pointHitsRect(viewportPoint, renderTarget->renderSurface()->screenSpaceTransform(), currentLayer->drawableContentRect()))

- return true;

- currentLayer = currentLayer->parent();

- }

- // If we have finished walking all ancestors without having already exited, then the point is not clipped by any ancestors.

- return false;

-CCLayerImpl* CCLayerTreeHostCommon::findLayerThatIsHitByPoint(const IntPoint& viewportPoint, std::vector<CCLayerImpl*>& renderSurfaceLayerList)

- CCLayerImpl* foundLayer = 0;

- typedef CCLayerIterator<CCLayerImpl, std::vector<CCLayerImpl*>, CCRenderSurface, CCLayerIteratorActions::FrontToBack> CCLayerIteratorType;

- CCLayerIteratorType end = CCLayerIteratorType::end(&renderSurfaceLayerList);

- for (CCLayerIteratorType it = CCLayerIteratorType::begin(&renderSurfaceLayerList); it != end; ++it) {

- // We don't want to consider renderSurfaces for hit testing.

- if (!it.representsItself())

- continue;

- CCLayerImpl* currentLayer = (*it);

- FloatRect contentRect(FloatPoint::zero(), currentLayer->contentBounds());

- if (!pointHitsRect(viewportPoint, currentLayer->screenSpaceTransform(), contentRect))

- continue;

- // At this point, we think the point does hit the layer, but we need to walk up

- // the parents to ensure that the layer was not clipped in such a way that the

- // hit point actually should not hit the layer.

- if (pointIsClippedBySurfaceOrClipRect(viewportPoint, currentLayer))

- continue;

- foundLayer = currentLayer;

- break;

- }

- // This can potentially return 0, which means the viewportPoint did not successfully hit test any layers, not even the root layer.

- return foundLayer;

-} // namespace cc

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