clip rect fix for iframe when GL on

First, for each layer, the clip rect should be intersecting with
all of its parents.
Then the rect should use pre-transformation info, the real
transformation will handle by the clip() function.

P.S: renaming variable "bounds" b/c there is a member function
using the same name.

bug:3304761

Change-Id: Id5d602b55da904c63b37cb5436b5bf2f5526a94f

1 files changed, 7 insertions, 9 deletions

diff --git a/WebCore/platform/graphics/android/LayerAndroid.cpp b/WebCore/platform/graphics/android/LayerAndroid.cpp
index 49cd4ca..91e38e5 100644
--- a/WebCore/platform/graphics/android/LayerAndroid.cpp
+++ b/WebCore/platform/graphics/android/LayerAndroid.cpp
@@ -475,13 +475,13 @@ void LayerAndroid::updatePositions()
 void LayerAndroid::updateGLPositions(const TransformationMatrix& parentMatrix,
                                      const FloatRect& clipping, float opacity)
 {
-    IntSize bounds(getSize().width(), getSize().height());
+    IntSize layerSize(getSize().width(), getSize().height());
     FloatPoint anchorPoint(getAnchorPoint().fX, getAnchorPoint().fY);
     FloatPoint position(getPosition().fX, getPosition().fY);
-    float centerOffsetX = (0.5f - anchorPoint.x()) * bounds.width();
-    float centerOffsetY = (0.5f - anchorPoint.y()) * bounds.height();
-    float originX = anchorPoint.x() * bounds.width();
-    float originY = anchorPoint.y() * bounds.height();
+    float centerOffsetX = (0.5f - anchorPoint.x()) * layerSize.width();
+    float centerOffsetY = (0.5f - anchorPoint.y()) * layerSize.height();
+    float originX = anchorPoint.x() * layerSize.width();
+    float originY = anchorPoint.y() * layerSize.height();
     TransformationMatrix localMatrix = parentMatrix;
     localMatrix.translate3d(originX + position.x(),
                             originY + position.y(),
@@ -501,10 +501,8 @@ void LayerAndroid::updateGLPositions(const TransformationMatrix& parentMatrix,
     setDrawOpacity(opacity);
 
     if (m_haveClip) {
-        FloatRect clip;
-        clip.setLocation(p);
-        clip.setWidth(getSize().width());
-        clip.setHeight(getSize().height());
+        FloatRect clip = (FloatRect) bounds();
+        clip.intersect(clipping);
         setDrawClip(clip);
     } else {
         setDrawClip(clipping);