First blitter for linear pipeline.

src/core/SkLinearBitmapPipeline.h

Index: src/core/SkLinearBitmapPipeline.h
diff --git a/src/core/SkLinearBitmapPipeline.h b/src/core/SkLinearBitmapPipeline.h
index 548302ef9acdade777548960e62dc9d35035e538..ec44c9d61fa8deb9afbfabe3d2c0dc3d647a6c66 100644
--- a/src/core/SkLinearBitmapPipeline.h
+++ b/src/core/SkLinearBitmapPipeline.h
@@ -21,9 +21,17 @@ public:
         SkShader::TileMode xTile, SkShader::TileMode yTile,
         float postAlpha,
         const SkPixmap& srcPixmap);
+
+    SkLinearBitmapPipeline(
+        const SkLinearBitmapPipeline& pipeline,
+        SkXfermode::Mode mode,
+        const SkPixmap& srcPixmap,
+        const SkImageInfo& dstInfo);
+
     ~SkLinearBitmapPipeline();
 
     void shadeSpan4f(int x, int y, SkPM4f* dst, int count);
+    void blitSpan(int32_t x, int32_t y, void* dst, int count);
 
     template<typename Base, size_t kSize, typename Next = void>
     class Stage {
@@ -65,10 +73,10 @@ public:
     class DestinationInterface;
 
     // These values were generated by the assert above in Stage::init{Sink|Stage}.
-    using MatrixStage  = Stage<PointProcessorInterface, 160, PointProcessorInterface>;
-    using TileStage    = Stage<PointProcessorInterface, 160, SampleProcessorInterface>;
+    using MatrixStage  = Stage<PointProcessorInterface,  160, PointProcessorInterface>;
+    using TileStage    = Stage<PointProcessorInterface,  160, SampleProcessorInterface>;
     using SampleStage  = Stage<SampleProcessorInterface, 100, BlendProcessorInterface>;
-    using BlenderStage = Stage<BlendProcessorInterface, 80>;
+    using BlenderStage = Stage<BlendProcessorInterface,   40>;
 
 private:
     PointProcessorInterface* fFirstStage;