[TexMap] A Minor optimization of GraphicsLayerTransform.

https://bugs.webkit.org/show_bug.cgi?id=105758

Patch by Huang Dongsung <luxtella@company100.net> on 2012-12-26
Reviewed by Noam Rosenthal.

Only multiply the transformation matrices if the paramaters are actually
changed.

This optimizes the code path called from flushCompositingStateForThisLayerOnly(),
and potentially setAnimatedTransform().

No new tests. Refactoring only.

* platform/graphics/GraphicsLayerTransform.cpp:
(WebCore::GraphicsLayerTransform::setPosition):
(WebCore::GraphicsLayerTransform::setSize):
(WebCore::GraphicsLayerTransform::setAnchorPoint):
(WebCore::GraphicsLayerTransform::setFlattening):
(WebCore::GraphicsLayerTransform::setLocalTransform):
(WebCore::GraphicsLayerTransform::setChildrenTransform):

Canonical link: https://commits.webkit.org/123971@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@138487 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/ChangeLog

@@ -1,3 +1,26 @@
+2012-12-26  Huang Dongsung  <luxtella@company100.net>
+
+        [TexMap] A Minor optimization of GraphicsLayerTransform.
+        https://bugs.webkit.org/show_bug.cgi?id=105758
+
+        Reviewed by Noam Rosenthal.
+
+        Only multiply the transformation matrices if the paramaters are actually
+        changed.
+
+        This optimizes the code path called from flushCompositingStateForThisLayerOnly(),
+        and potentially setAnimatedTransform().
+
+        No new tests. Refactoring only.
+
+        * platform/graphics/GraphicsLayerTransform.cpp:
+        (WebCore::GraphicsLayerTransform::setPosition):
+        (WebCore::GraphicsLayerTransform::setSize):
+        (WebCore::GraphicsLayerTransform::setAnchorPoint):
+        (WebCore::GraphicsLayerTransform::setFlattening):
+        (WebCore::GraphicsLayerTransform::setLocalTransform):
+        (WebCore::GraphicsLayerTransform::setChildrenTransform):
+
 2012-12-26  Huang Dongsung  <luxtella@company100.net>
 
         [TexMap] Remove unused members and methods in TextureMapperLayer.

Source/WebCore/platform/graphics/GraphicsLayerTransform.cpp

@@ -31,36 +31,48 @@ GraphicsLayerTransform::GraphicsLayerTransform()
 
 void GraphicsLayerTransform::setPosition(const FloatPoint& position)
 {
+    if (m_position == position)
+        return;
     m_position = position;
     m_dirty = true;
 }
 
 void GraphicsLayerTransform::setSize(const FloatSize& size)
 {
+    if (m_size == size)
+        return;
     m_size = size;
     m_dirty = true;
 }
 
 void GraphicsLayerTransform::setAnchorPoint(const FloatPoint3D& anchorPoint)
 {
+    if (m_anchorPoint == anchorPoint)
+        return;
     m_anchorPoint = anchorPoint;
     m_dirty = true;
 }
 
 void GraphicsLayerTransform::setFlattening(bool flattening)
 {
+    if (m_flattening == flattening)
+        return;
     m_flattening = flattening;
     m_dirty = true;
 }
 
 void GraphicsLayerTransform::setLocalTransform(const TransformationMatrix& transform)
 {
+    if (m_local == transform)
+        return;
     m_local = transform;
     m_dirty = true;
 }
 
 void GraphicsLayerTransform::setChildrenTransform(const TransformationMatrix& transform)
 {
+    if (m_children == transform)
+        return;
     m_children = transform;
     m_dirty = true;
 }