Add BlitRect to SkTCompressedAlphaBlitter

src/utils/SkTextureCompressor_R11EAC.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTextureCompressor.h"
 #include "SkTextureCompressor_Blitter.h"
 
@@ skipping 585 matching lines @@
 struct CompressorR11EAC {
     static inline void CompressA8Vertical(uint8_t* dst, const uint8_t* src) {
         compress_block_vertical(dst, src);
     }
 
     static inline void CompressA8Horizontal(uint8_t* dst, const uint8_t* src,
                                             int srcRowBytes) {
         *(reinterpret_cast<uint64_t*>(dst)) = compress_r11eac_block_fast(src, srcRowBytes);
     }
 
-    static inline void UpdateBlock(uint8_t* dst, const uint8_t* src) {
+#if PEDANTIC_BLIT_RECT
+    static inline void UpdateBlock(uint8_t* dst, const uint8_t* src, int srcRowBytes,
+                                   const uint8_t* mask) {
+        // TODO: krajcevski
+        // The implementation of this function should be similar to that of LATC, since
+        // the R11EAC indices directly correspond to pixel values.
+        SkFAIL("Implement me!");
     }
+#endif
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace SkTextureCompressor {
 
 bool CompressA8ToR11EAC(uint8_t* dst, const uint8_t* src, int width, int height, int rowBytes) {
 
 #if (COMPRESS_R11_EAC_SLOW) || (COMPRESS_R11_EAC_FAST)
 
@@ skipping 35 matching lines @@
     for (int j = 0; j < height; j += 4) {
         for (int i = 0; i < width; i += 4) {
             decompress_r11_eac_block(dst + i, dstRowBytes, src);
             src += 8;
         }
         dst += 4 * dstRowBytes;
     }    
 }
 
 }  // namespace SkTextureCompressor