More framework support for TransferBuffers

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
@@ skipping 248 matching lines @@
      * @param buffer        memory to read pixels from
      * @param rowBytes      number of bytes between consecutive rows. Zero
      *                      means rows are tightly packed.
      */
     bool writePixels(GrSurface* surface,
                      int left, int top, int width, int height,
                      GrPixelConfig config, const void* buffer,
                      size_t rowBytes);
 
     /**
+    * Updates the pixels in a rectangle of a surface using a GrTransferBuffer
+    *
+    * @param surface       The surface to write to.
+    * @param left          left edge of the rectangle to write (inclusive)
+    * @param top           top edge of the rectangle to write (inclusive)
+    * @param width         width of rectangle to write in pixels.
+    * @param height        height of rectangle to write in pixels.
+    * @param config        the pixel config of the source buffer
+    * @param buffer        GrTransferBuffer to read pixels from
+    * @param offset        offset from the start of the buffer
+    * @param rowBytes      number of bytes between consecutive rows. Zero
+    *                      means rows are tightly packed.
+    */
+    bool transferPixels(GrSurface* surface,
+                        int left, int top, int width, int height,
+                        GrPixelConfig config, GrTransferBuffer* buffer,
+                        size_t offset, size_t rowBytes);
+
+    /**
      * Clear the passed in render target. Ignores the draw state and clip.
      */
     void clear(const SkIRect& rect, GrColor color, GrRenderTarget* renderTarget);
 
 
     void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* renderTarget);
 
     /**
      * Discards the contents render target. nullptr indicates that the current render target should
      * be discarded.
@@ skipping 222 matching lines @@
                               GrPixelConfig,
                               void* buffer,
                               size_t rowBytes) = 0;
 
     // overridden by backend-specific derived class to perform the surface write
     virtual bool onWritePixels(GrSurface*,
                                int left, int top, int width, int height,
                                GrPixelConfig config, const void* buffer,
                                size_t rowBytes) = 0;
 
+    // overridden by backend-specific derived class to perform the surface write
+    virtual bool onTransferPixels(GrSurface*,
+                                  int left, int top, int width, int height,
+                                  GrPixelConfig config, GrTransferBuffer* buffer,
+                                  size_t offset, size_t rowBytes) = 0;
+
     // overridden by backend-specific derived class to perform the resolve
     virtual void onResolveRenderTarget(GrRenderTarget* target) = 0;
 
     // overridden by backend specific derived class to perform the copy surface
     virtual bool onCopySurface(GrSurface* dst,
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint) = 0;
 
     void resetContext() {
         this->onResetContext(fResetBits);
         fResetBits = 0;
         ++fResetTimestamp;
     }
 
     ResetTimestamp                                                      fResetTimestamp;
     uint32_t                                                            fResetBits;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif