Don't overdraw TileGrids

Given the visible area info, we can just tune the shader and matrix to draw
partial tile at the edge of TileGrids. This could save a lot of GPU time.

Change-Id: I1a45aa9a3a76ab5894096828bfff83057b1c9272

1 files changed, 7 insertions, 1 deletions

diff --git a/Source/WebCore/platform/graphics/android/rendering/DrawQuadData.h b/Source/WebCore/platform/graphics/android/rendering/DrawQuadData.h
index 687808d..bce82f2 100644
--- a/Source/WebCore/platform/graphics/android/rendering/DrawQuadData.h
+++ b/Source/WebCore/platform/graphics/android/rendering/DrawQuadData.h
@@ -29,6 +29,7 @@
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "Color.h"
+#include "FloatPoint.h"
 #include "SkRect.h"
 #include <GLES2/gl2.h>
 
@@ -49,12 +50,14 @@ public:
                  const TransformationMatrix* drawMatrix = 0,
                  const SkRect* geometry = 0,
                  float opacity = 1.0f,
-                 bool forceBlending = true)
+                 bool forceBlending = true,
+                 FloatPoint fillPortion = FloatPoint(1.0f, 1.0f))
         : m_type(type)
         , m_drawMatrix(drawMatrix)
         , m_geometry(geometry)
         , m_opacity(opacity)
         , m_forceBlending(forceBlending)
+        , m_fillPortion(fillPortion.x(), fillPortion.y())
     {
     }
 
@@ -64,6 +67,7 @@ public:
         , m_geometry(data.m_geometry)
         , m_opacity(data.m_opacity)
         , m_forceBlending(data.m_forceBlending)
+        , m_fillPortion(data.m_fillPortion.x(), data.m_fillPortion.y())
     {
     }
 
@@ -86,6 +90,7 @@ public:
     virtual int textureId() const { return 0; }
     virtual GLint textureFilter() const { return 0; }
     virtual GLenum textureTarget() const { return 0; }
+    virtual FloatPoint fillPortion() const { return m_fillPortion; }
 
 private:
     DrawQuadType m_type;
@@ -93,6 +98,7 @@ private:
     const SkRect* m_geometry;
     float m_opacity;
     bool m_forceBlending;
+    FloatPoint m_fillPortion;
 };
 
 class PureColorQuadData : public DrawQuadData {