Migrate most of cc/ from WebKit::WebTransformationMatrix to gfx::Transform

cc/layer_tree_host_common.cc

 // Copyright 2011 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 "cc/layer_tree_host_common.h"
 
+#include <algorithm>
+
 #include "cc/layer.h"
 #include "cc/layer_impl.h"
 #include "cc/layer_iterator.h"
 #include "cc/layer_sorter.h"
 #include "cc/math_util.h"
 #include "cc/render_surface.h"
 #include "cc/render_surface_impl.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
-#include <algorithm>
-#include <public/WebTransformationMatrix.h>
+#include "ui/gfx/transform.h"
 
-using WebKit::WebTransformationMatrix;
+using gfx::Transform;
 
 namespace cc {
 
 ScrollAndScaleSet::ScrollAndScaleSet()
 {
 }
 
 ScrollAndScaleSet::~ScrollAndScaleSet()
 {
 }
 
-gfx::Rect LayerTreeHostCommon::calculateVisibleRect(const gfx::Rect& targetSurfaceRect, const gfx::Rect& layerBoundRect, const WebTransformationMatrix& transform)
+gfx::Rect LayerTreeHostCommon::calculateVisibleRect(const gfx::Rect& targetSurfaceRect, const gfx::Rect& layerBoundRect, const Transform& transform)
 {
     // Is this layer fully contained within the target surface?
     gfx::Rect layerInSurfaceSpace = MathUtil::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.
     gfx::Rect 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();
+    const Transform surfaceToLayer = MathUtil::inverse(transform);
     gfx::Rect layerRect = gfx::ToEnclosingRect(MathUtil::projectClippedRect(surfaceToLayer, gfx::RectF(minimalSurfaceRect)));
     layerRect.Intersect(layerBoundRect);
     return layerRect;
 }
 
 template <typename LayerType>
 static inline bool isRootLayer(LayerType* layer)
 {
     return !layer->parent();
 }
@@ skipping 20 matching lines @@
 
 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();
+        return MathUtil::isBackFaceVisible(layer->drawTransform());
 
     // 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();
+    return MathUtil::isBackFaceVisible(layer->transform());
 }
 
 template<typename LayerType>
-static bool isSurfaceBackFaceVisible(LayerType* layer, const WebTransformationMatrix& drawTransform)
+static bool isSurfaceBackFaceVisible(LayerType* layer, const Transform& drawTransform)
 {
     if (layerIsInExisting3DRenderingContext(layer))
-        return drawTransform.isBackFaceVisible();
+        return MathUtil::isBackFaceVisible(drawTransform);
 
     if (isRootLayerOfNewRenderingContext(layer))
-        return layer->transform().isBackFaceVisible();
+        return MathUtil::isBackFaceVisible(layer->transform());
 
     // 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();
@@ skipping 10 matching lines @@
 
     gfx::Rect 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 = gfx::ToEnclosingRect(MathUtil::projectClippedRect(layer->renderTarget()->renderSurface()->drawTransform().inverse(), layer->renderTarget()->renderSurface()->clipRect()));
+        targetSurfaceClipRect = gfx::ToEnclosingRect(MathUtil::projectClippedRect(MathUtil::inverse(layer->renderTarget()->renderSurface()->drawTransform()), layer->renderTarget()->renderSurface()->clipRect()));
         targetSurfaceClipRect.Intersect(layer->drawableContentRect());
     }
 
     if (targetSurfaceClipRect.IsEmpty())
         return gfx::Rect();
 
     return LayerTreeHostCommon::calculateVisibleRect(targetSurfaceClipRect, gfx::Rect(gfx::Point(), layer->contentBounds()), layer->drawTransform());
 }
 
-static bool isScaleOrTranslation(const WebTransformationMatrix& m)
+static bool isScaleOrTranslation(const Transform& m)
 {
-    return !m.m12() && !m.m13() && !m.m14()
-           && !m.m21() && !m.m23() && !m.m24()
-           && !m.m31() && !m.m32() && !m.m43()
-           && m.m44();
+    return !m.matrix().getDouble(1, 0) && !m.matrix().getDouble(2, 0) && !m.matrix().getDouble(3, 0)
+           && !m.matrix().getDouble(0, 1) && !m.matrix().getDouble(2, 1) && !m.matrix().getDouble(3, 1)
+           && !m.matrix().getDouble(0, 2) && !m.matrix().getDouble(1, 2) && !m.matrix().getDouble(2, 3)
+           && m.matrix().getDouble(3, 3);
 }
 
 static inline bool transformToParentIsKnown(LayerImpl*)
 {
     return true;
 }
 
 static inline bool transformToParentIsKnown(Layer* layer)
 {
     return !layer->transformIsAnimating();
@@ skipping 98 matching lines @@
     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(LayerImpl* scrollingLayer, const WebTransformationMatrix& parentMatrix)
+Transform computeScrollCompensationForThisLayer(LayerImpl* scrollingLayer, const Transform& 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());
+    Transform partialLayerOriginTransform = parentMatrix;
+    partialLayerOriginTransform.PreconcatTransform(scrollingLayer->implTransform());
 
-    WebTransformationMatrix scrollCompensationForThisLayer = partialLayerOriginTransform; // Step 3
-    scrollCompensationForThisLayer.translate(scrollingLayer->scrollDelta().x(), scrollingLayer->scrollDelta().y()); // Step 2
-    scrollCompensationForThisLayer.multiply(partialLayerOriginTransform.inverse()); // Step 1
+    Transform scrollCompensationForThisLayer = partialLayerOriginTransform; // Step 3
+    scrollCompensationForThisLayer.PreconcatTranslate(scrollingLayer->scrollDelta().x(), scrollingLayer->scrollDelta().y()); // Step 2
+    scrollCompensationForThisLayer.PreconcatTransform(MathUtil::inverse(partialLayerOriginTransform)); // Step 1
     return scrollCompensationForThisLayer;
 }
 
-WebTransformationMatrix computeScrollCompensationMatrixForChildren(Layer* currentLayer, const WebTransformationMatrix& currentParentMatrix, const WebTransformationMatrix& currentScrollCompensation)
+Transform computeScrollCompensationMatrixForChildren(Layer* currentLayer, const Transform& currentParentMatrix, const Transform& currentScrollCompensation)
 {
     // The main thread (i.e. Layer) does not need to worry about scroll compensation.
     // So we can just return an identity matrix here.
-    return WebTransformationMatrix();
+    return Transform();
 }
 
-WebTransformationMatrix computeScrollCompensationMatrixForChildren(LayerImpl* layer, const WebTransformationMatrix& parentMatrix, const WebTransformationMatrix& currentScrollCompensationMatrix)
+Transform computeScrollCompensationMatrixForChildren(LayerImpl* layer, const Transform& parentMatrix, const Transform& 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.)
     //  - 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;
+    Transform 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);
+        Transform scrollCompensationForThisLayer = computeScrollCompensationForThisLayer(layer, parentMatrix);
+        nextScrollCompensationMatrix.PreconcatTransform(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();
+    if (layer->renderSurface() && !nextScrollCompensationMatrix.IsIdentity())
+        nextScrollCompensationMatrix = MathUtil::inverse(layer->renderSurface()->drawTransform()) * nextScrollCompensationMatrix * layer->renderSurface()->drawTransform();
 
     return nextScrollCompensationMatrix;
 }
 
 // There is no contentsScale on impl thread.
-static inline void updateLayerContentsScale(LayerImpl*, const WebTransformationMatrix&, float, float, bool) { }
+static inline void updateLayerContentsScale(LayerImpl*, const Transform&, float, float, bool) { }
 
-static inline void updateLayerContentsScale(Layer* layer, const WebTransformationMatrix& combinedTransform, float deviceScaleFactor, float pageScaleFactor, bool animatingTransformToScreen)
+static inline void updateLayerContentsScale(Layer* layer, const Transform& combinedTransform, float deviceScaleFactor, float pageScaleFactor, bool animatingTransformToScreen)
 {
     float rasterScale = layer->rasterScale();
     if (!rasterScale) {
         rasterScale = 1;
 
         if (!animatingTransformToScreen && layer->automaticallyComputeRasterScale()) {
             gfx::Vector2dF transformScale = MathUtil::computeTransform2dScaleComponents(combinedTransform);
             float combinedScale = std::max(transformScale.x(), transformScale.y());
             rasterScale = combinedScale / deviceScaleFactor;
             if (!layer->boundsContainPageScale())
@@ skipping 16 matching lines @@
         maskLayer->setContentsScale(contentsScale);
 
     Layer* replicaMaskLayer = layer->replicaLayer() ? layer->replicaLayer()->maskLayer() : 0;
     if (replicaMaskLayer)
         replicaMaskLayer->setContentsScale(contentsScale);
 }
 
 // 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, const WebTransformationMatrix& parentMatrix,
-    const WebTransformationMatrix& fullHierarchyMatrix, const WebTransformationMatrix& currentScrollCompensationMatrix,
+static void calculateDrawTransformsInternal(LayerType* layer, const Transform& parentMatrix,
+    const Transform& fullHierarchyMatrix, const Transform& currentScrollCompensationMatrix,
     const gfx::Rect& clipRectFromAncestor, bool ancestorClipsSubtree,
     RenderSurfaceType* nearestAncestorThatMovesPixels, LayerList& renderSurfaceLayerList, LayerList& layerList,
     LayerSorter* layerSorter, int maxTextureSize, float deviceScaleFactor, float pageScaleFactor, gfx::Rect& 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 PointF object, is specified in "unit layer space",
-    //    where the bounds of the layer map to [0, 1]. However, as a WebTransformationMatrix object,
+    //    where the bounds of the layer map to [0, 1]. However, as a Transform 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)
@@ skipping 77 matching lines @@
     bool animatingTransformToScreen = animatingTransformToTarget;
     if (layer->parent()) {
         animatingTransformToTarget |= layer->parent()->drawTransformIsAnimating();
         animatingTransformToScreen |= layer->parent()->screenSpaceTransformIsAnimating();
     }
 
     gfx::Size bounds = layer->bounds();
     gfx::PointF anchorPoint = layer->anchorPoint();
     gfx::PointF position = layer->position() - layer->scrollDelta();
 
-    WebTransformationMatrix layerLocalTransform;
+    Transform layerLocalTransform;
     // LT = Tr[origin] * Tr[origin2anchor]
-    layerLocalTransform.translate3d(position.x() + anchorPoint.x() * bounds.width(), position.y() + anchorPoint.y() * bounds.height(), layer->anchorPointZ());
+    layerLocalTransform.PreconcatTranslate3d(position.x() + anchorPoint.x() * bounds.width(), position.y() + anchorPoint.y() * bounds.height(), layer->anchorPointZ());
     // LT = Tr[origin] * Tr[origin2anchor] * M[layer]
-    layerLocalTransform.multiply(layer->transform());
+    layerLocalTransform.PreconcatTransform(layer->transform());
     // LT = Tr[origin] * Tr[origin2anchor] * M[layer] * Tr[anchor2origin]
-    layerLocalTransform.translate3d(-anchorPoint.x() * bounds.width(), -anchorPoint.y() * bounds.height(), -layer->anchorPointZ());
+    layerLocalTransform.PreconcatTranslate3d(-anchorPoint.x() * bounds.width(), -anchorPoint.y() * bounds.height(), -layer->anchorPointZ());
 
-    WebTransformationMatrix combinedTransform = parentMatrix;
-    combinedTransform.multiply(layerLocalTransform);
+    Transform combinedTransform = parentMatrix;
+    combinedTransform.PreconcatTransform(layerLocalTransform);
 
     // The layer's contentsSize is determined from the combinedTransform, which then informs the
     // layer's drawTransform.
     updateLayerContentsScale(layer, combinedTransform, deviceScaleFactor, pageScaleFactor, animatingTransformToScreen);
 
     // If there is a tranformation from the impl thread then it should be at the
     // start of the combinedTransform, but we don't want it to affect the contentsScale.
     combinedTransform = layer->implTransform() * combinedTransform;
 
     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;
+    Transform drawTransform = combinedTransform;
     // M[draw] = M[parent] * LT * S[layer2content]
-    drawTransform.scaleNonUniform(1.0 / layer->contentsScaleX(), 1.0 / layer->contentsScaleY());
+    drawTransform.PreconcatScale(1.0 / layer->contentsScaleX(), 1.0 / layer->contentsScaleY());
 
     // layerScreenSpaceTransform represents the transform between root layer's "screen space" and local content space.
-    WebTransformationMatrix layerScreenSpaceTransform = fullHierarchyMatrix;
+    Transform layerScreenSpaceTransform = fullHierarchyMatrix;
     if (!layer->preserves3D())
         MathUtil::flattenTransformTo2d(layerScreenSpaceTransform);
-    layerScreenSpaceTransform.multiply(drawTransform);
+    layerScreenSpaceTransform.PreconcatTransform(drawTransform);
     layer->setScreenSpaceTransform(layerScreenSpaceTransform);
 
     gfx::RectF contentRect(gfx::PointF(), layer->contentBounds());
 
     // fullHierarchyMatrix is the matrix that transforms objects between screen space (except projection matrix) and the most recent RenderSurfaceImpl's space.
     // nextHierarchyMatrix will only change if this layer uses a new RenderSurfaceImpl, otherwise remains the same.
-    WebTransformationMatrix nextHierarchyMatrix = fullHierarchyMatrix;
-    WebTransformationMatrix sublayerMatrix;
+    Transform nextHierarchyMatrix = fullHierarchyMatrix;
+    Transform sublayerMatrix;
 
     gfx::Vector2dF renderSurfaceSublayerScale = MathUtil::computeTransform2dScaleComponents(combinedTransform);
 
     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 owning layer's draw transform has a scale from content to layer space which we need to undo and
         // replace with a scale from the surface's subtree into layer space.
-        drawTransform.scaleNonUniform(layer->contentsScaleX(), layer->contentsScaleY());
-        drawTransform.scaleNonUniform(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
+        drawTransform.PreconcatScale(layer->contentsScaleX(), layer->contentsScaleY());
+        drawTransform.PreconcatScale(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
         renderSurface->setDrawTransform(drawTransform);
 
         // The origin of the new surface is the upper left corner of the layer.
-        WebTransformationMatrix layerDrawTransform;
-        layerDrawTransform.scaleNonUniform(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
-        layerDrawTransform.scaleNonUniform(1.0 / layer->contentsScaleX(), 1.0 / layer->contentsScaleY());
+        Transform layerDrawTransform;
+        layerDrawTransform.PreconcatScale(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
+        layerDrawTransform.PreconcatScale(1.0 / layer->contentsScaleX(), 1.0 / layer->contentsScaleY());
         layer->setDrawTransform(layerDrawTransform);
 
         // Inside the surface's subtree, we scale everything to the owning layer's scale.
         // The sublayer matrix transforms centered layer rects into target
         // surface content space.
-        sublayerMatrix.makeIdentity();
-        sublayerMatrix.scaleNonUniform(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
+        sublayerMatrix.matrix().setIdentity();
+        sublayerMatrix.PreconcatScale(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
 
         // 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 RenderSurfaceImpl.
-        nextHierarchyMatrix.multiply(renderSurface->drawTransform());
+        nextHierarchyMatrix.PreconcatTransform(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(gfx::Rect(gfx::Point(), layer->contentBounds()));
@@ skipping 50 matching lines @@
             clipRectForSubtree.Intersect(rectInTargetSpace);
         } else
             clipRectForSubtree = rectInTargetSpace;
     }
 
     // Flatten to 2D if the layer doesn't preserve 3D.
     if (!layer->preserves3D())
         MathUtil::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());
+    sublayerMatrix.PreconcatTranslate(0.5 * bounds.width(), 0.5 * bounds.height());
+    sublayerMatrix.PreconcatTransform(layer->sublayerTransform());
+    sublayerMatrix.PreconcatTranslate(-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);;
+    Transform nextScrollCompensationMatrix = computeScrollCompensationMatrixForChildren(layer, parentMatrix, currentScrollCompensationMatrix);;
 
     gfx::Rect accumulatedDrawableContentRectOfChildren;
     for (size_t i = 0; i < layer->children().size(); ++i) {
         LayerType* child = LayerTreeHostCommon::getChildAsRawPtr(layer->children(), i);
         gfx::Rect drawableContentRectOfChildSubtree;
         calculateDrawTransformsInternal<LayerType, LayerList, RenderSurfaceType, LayerSorter>(child, sublayerMatrix, nextHierarchyMatrix, nextScrollCompensationMatrix,
                                                                                               clipRectForSubtree, subtreeShouldBeClipped, nearestAncestorThatMovesPixels,
                                                                                               renderSurfaceLayerList, descendants, layerSorter, maxTextureSize, deviceScaleFactor, pageScaleFactor, drawableContentRectOfChildSubtree);
         if (!drawableContentRectOfChildSubtree.IsEmpty()) {
             accumulatedDrawableContentRectOfChildren.Union(drawableContentRectOfChildSubtree);
@@ skipping 58 matching lines @@
         clippedContentRect.set_width(std::min(clippedContentRect.width(), maxTextureSize));
         clippedContentRect.set_height(std::min(clippedContentRect.height(), maxTextureSize));
 
         if (clippedContentRect.IsEmpty())
             renderSurface->clearLayerLists();
 
         renderSurface->setContentRect(clippedContentRect);
 
         // The owning layer's screenSpaceTransform has a scale from content to layer space which we need to undo and
         // replace with a scale from the surface's subtree into layer space.
-        WebTransformationMatrix screenSpaceTransform = layer->screenSpaceTransform();
-        screenSpaceTransform.scaleNonUniform(layer->contentsScaleX(), layer->contentsScaleY());
-        screenSpaceTransform.scaleNonUniform(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
+        Transform screenSpaceTransform = layer->screenSpaceTransform();
+        screenSpaceTransform.PreconcatScale(layer->contentsScaleX(), layer->contentsScaleY());
+        screenSpaceTransform.PreconcatScale(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
         renderSurface->setScreenSpaceTransform(screenSpaceTransform);
 
         if (layer->replicaLayer()) {
-            WebTransformationMatrix surfaceOriginToReplicaOriginTransform;
-            surfaceOriginToReplicaOriginTransform.scaleNonUniform(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
-            surfaceOriginToReplicaOriginTransform.translate(layer->replicaLayer()->position().x() + layer->replicaLayer()->anchorPoint().x() * bounds.width(),
+            Transform surfaceOriginToReplicaOriginTransform;
+            surfaceOriginToReplicaOriginTransform.PreconcatScale(renderSurfaceSublayerScale.x(), renderSurfaceSublayerScale.y());
+            surfaceOriginToReplicaOriginTransform.PreconcatTranslate(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.scaleNonUniform(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
+            surfaceOriginToReplicaOriginTransform.PreconcatTransform(layer->replicaLayer()->transform());
+            surfaceOriginToReplicaOriginTransform.PreconcatTranslate(-layer->replicaLayer()->anchorPoint().x() * bounds.width(), -layer->replicaLayer()->anchorPoint().y() * bounds.height());
+            surfaceOriginToReplicaOriginTransform.PreconcatScale(1 / renderSurfaceSublayerScale.x(), 1 / renderSurfaceSublayerScale.y());
 
             // 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;
+            Transform 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;
+            Transform 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.
@@ skipping 23 matching lines @@
     else
         drawableContentRectOfSubtree = localDrawableContentRectOfSubtree;
 
     if (layer->hasContributingDelegatedRenderPasses())
         layer->renderTarget()->renderSurface()->addContributingDelegatedRenderPassLayer(layer);
 }
 
 void LayerTreeHostCommon::calculateDrawTransforms(Layer* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, int maxTextureSize, std::vector<scoped_refptr<Layer> >& renderSurfaceLayerList)
 {
     gfx::Rect totalDrawableContentRect;
-    WebTransformationMatrix identityMatrix;
-    WebTransformationMatrix deviceScaleTransform;
-    deviceScaleTransform.scale(deviceScaleFactor);
+    Transform identityMatrix;
+    Transform deviceScaleTransform;
+    deviceScaleTransform.PreconcatScale(deviceScaleFactor, deviceScaleFactor);
     std::vector<scoped_refptr<Layer> > dummyLayerList;
 
     // The root layer's renderSurface should receive the deviceViewport as the initial clipRect.
     bool subtreeShouldBeClipped = true;
     gfx::Rect deviceViewportRect(gfx::Point(), deviceViewportSize);
 
     // This function should have received a root layer.
     DCHECK(isRootLayer(rootLayer));
 
     cc::calculateDrawTransformsInternal<Layer, std::vector<scoped_refptr<Layer> >, RenderSurface, void>(
         rootLayer, deviceScaleTransform, identityMatrix, identityMatrix,
         deviceViewportRect, subtreeShouldBeClipped, 0, renderSurfaceLayerList,
         dummyLayerList, 0, maxTextureSize,
         deviceScaleFactor, pageScaleFactor, totalDrawableContentRect);
 
     // The dummy layer list should not have been used.
     DCHECK(dummyLayerList.size() == 0);
     // A root layer renderSurface should always exist after calculateDrawTransforms.
     DCHECK(rootLayer->renderSurface());
 }
 
 void LayerTreeHostCommon::calculateDrawTransforms(LayerImpl* rootLayer, const gfx::Size& deviceViewportSize, float deviceScaleFactor, float pageScaleFactor, LayerSorter* layerSorter, int maxTextureSize, std::vector<LayerImpl*>& renderSurfaceLayerList)
 {
     gfx::Rect totalDrawableContentRect;
-    WebTransformationMatrix identityMatrix;
-    WebTransformationMatrix deviceScaleTransform;
-    deviceScaleTransform.scale(deviceScaleFactor);
+    Transform identityMatrix;
+    Transform deviceScaleTransform;
+    deviceScaleTransform.PreconcatScale(deviceScaleFactor, deviceScaleFactor);
     std::vector<LayerImpl*> dummyLayerList;
 
     // The root layer's renderSurface should receive the deviceViewport as the initial clipRect.
     bool subtreeShouldBeClipped = true;
     gfx::Rect deviceViewportRect(gfx::Point(), deviceViewportSize);
 
     // This function should have received a root layer.
     DCHECK(isRootLayer(rootLayer));
 
     cc::calculateDrawTransformsInternal<LayerImpl, std::vector<LayerImpl*>, RenderSurfaceImpl, LayerSorter>(
         rootLayer, deviceScaleTransform, identityMatrix, identityMatrix,
         deviceViewportRect, subtreeShouldBeClipped, 0, renderSurfaceLayerList,
         dummyLayerList, layerSorter, maxTextureSize,
         deviceScaleFactor, pageScaleFactor, totalDrawableContentRect);
 
     // The dummy layer list should not have been used.
     DCHECK(dummyLayerList.size() == 0);
     // A root layer renderSurface should always exist after calculateDrawTransforms.
     DCHECK(rootLayer->renderSurface());
 }
 
-static bool pointHitsRect(const gfx::PointF& screenSpacePoint, const WebTransformationMatrix& localSpaceToScreenSpaceTransform, gfx::RectF localSpaceRect)
+static bool pointHitsRect(const gfx::PointF& screenSpacePoint, const Transform& localSpaceToScreenSpaceTransform, gfx::RectF localSpaceRect)
 {
     // If the transform is not invertible, then assume that this point doesn't hit this rect.
-    if (!localSpaceToScreenSpaceTransform.isInvertible())
+    if (!localSpaceToScreenSpaceTransform.IsInvertible())
         return false;
 
     // Transform the hit test point from screen space to the local space of the given rect.
     bool clipped = false;
-    gfx::PointF hitTestPointInLocalSpace = MathUtil::projectPoint(localSpaceToScreenSpaceTransform.inverse(), screenSpacePoint, clipped);
+    gfx::PointF hitTestPointInLocalSpace = MathUtil::projectPoint(MathUtil::inverse(localSpaceToScreenSpaceTransform), screenSpacePoint, 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 pointHitsRegion(gfx::PointF screenSpacePoint, const WebTransformationMatrix& screenSpaceTransform, const Region& layerSpaceRegion, float layerContentScaleX, float layerContentScaleY)
+static bool pointHitsRegion(gfx::PointF screenSpacePoint, const Transform& screenSpaceTransform, const Region& layerSpaceRegion, float layerContentScaleX, float layerContentScaleY)
 {
     // If the transform is not invertible, then assume that this point doesn't hit this region.
-    if (!screenSpaceTransform.isInvertible())
+    if (!screenSpaceTransform.IsInvertible())
         return false;
 
     // Transform the hit test point from screen space to the local space of the given region.
     bool clipped = false;
-    gfx::PointF hitTestPointInContentSpace = MathUtil::projectPoint(screenSpaceTransform.inverse(), screenSpacePoint, clipped);
+    gfx::PointF hitTestPointInContentSpace = MathUtil::projectPoint(MathUtil::inverse(screenSpaceTransform), screenSpacePoint, clipped);
     gfx::PointF hitTestPointInLayerSpace = gfx::ScalePoint(hitTestPointInContentSpace, 1 / layerContentScaleX, 1 / layerContentScaleY);
 
     // If projectPoint could not project to a valid value, then we assume that this point doesn't hit this region.
     if (clipped)
         return false;
 
     return layerSpaceRegion.Contains(gfx::ToRoundedPoint(hitTestPointInLayerSpace));
 }
 
 static bool pointIsClippedBySurfaceOrClipRect(const gfx::PointF& screenSpacePoint, LayerImpl* layer)
@@ skipping 78 matching lines @@
 
         foundLayer = currentLayer;
         break;
     }
 
     // This can potentially return 0, which means the screenSpacePoint did not successfully hit test any layers, not even the root layer.
     return foundLayer;
 }
 
 }  // namespace cc