Initial work to get ETC1 data up to the GPU

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 53 matching lines @@
         fResetBits |= state;
     }
 
     void unimpl(const char[]);
 
     /**
      * Creates a texture object. If desc width or height is not a power of
      * two but underlying API requires a power of two texture then srcData
      * will be embedded in a power of two texture. The extra width and height
      * is filled as though srcData were rendered clamped into the texture.
+     * The exception is when using compressed data formats. In this case, the
+     * desc width and height must be a multiple of the compressed format block
+     * size otherwise this function returns NULL. Similarly, if the underlying
+     * API requires a power of two texture and the source width and height are not
+     * a power of two, then this function returns NULL.
      *
      * If kRenderTarget_TextureFlag is specified the GrRenderTarget is
      * accessible via GrTexture::asRenderTarget(). The texture will hold a ref
-     * on the render target until the texture is destroyed.
+     * on the render target until the texture is destroyed. Compressed textures
+     * cannot have the kRenderTarget_TextureFlag set.
      *
      * @param desc        describes the texture to be created.
      * @param srcData     texel data to load texture. Begins with full-size
-     *                    palette data for paletted textures. Contains width*
-     *                    height texels. If NULL texture data is uninitialized.
+     *                    palette data for paletted textures. For compressed
+     *                    formats it contains the compressed pixel data. Otherwise,
+     *                    it contains width*height texels. If NULL texture data
+     *                    is uninitialized.
+     * @param rowBytes    the number of bytes between consecutive rows. Zero
+     *                    means rows are tightly packed. This field is ignored
+     *                    for compressed formats.
      *
      * @return    The texture object if successful, otherwise NULL.
      */
     GrTexture* createTexture(const GrTextureDesc& desc,
                              const void* srcData, size_t rowBytes);
 
     /**
      * Implements GrContext::wrapBackendTexture
      */
     GrTexture* wrapBackendTexture(const GrBackendTextureDesc&);
@@ skipping 314 matching lines @@
 
 
     // called when the 3D context state is unknown. Subclass should emit any
     // assumed 3D context state and dirty any state cache.
     virtual void onResetContext(uint32_t resetBits) = 0;
 
     // overridden by backend-specific derived class to create objects.
     virtual GrTexture* onCreateTexture(const GrTextureDesc& desc,
                                        const void* srcData,
                                        size_t rowBytes) = 0;
+    virtual GrTexture* onCreateCompressedTexture(const GrTextureDesc& desc,
+                                                 const void* srcData) = 0;
     virtual GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&) = 0;
     virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&) = 0;
     virtual GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) = 0;
     virtual GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) = 0;
     virtual GrPath* onCreatePath(const SkPath& path, const SkStrokeRec&) = 0;
 
     // overridden by backend-specific derived class to perform the clear and
     // clearRect. NULL rect means clear whole target. If canIgnoreRect is
     // true, it is okay to perform a full clear instead of a partial clear
     virtual void onClear(const SkIRect* rect, GrColor color, bool canIgnoreRect) = 0;
@@ skipping 87 matching lines @@
     // these are mutable so they can be created on-demand
     mutable GrIndexBuffer*                                              fQuadIndexBuffer;
     // Used to abandon/release all resources created by this GrGpu. TODO: Move this
     // functionality to GrResourceCache.
     ObjectList                                                          fObjectList;
 
     typedef GrDrawTarget INHERITED;
 };
 
 #endif