Add new ASTC pixel config

include/gpu/GrTypes.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
@@ skipping 269 matching lines @@
     kETC1_GrPixelConfig,
     /**
      * LATC/RGTC/3Dc/BC4 Compressed Data
      */
     kLATC_GrPixelConfig,
     /**
      * R11 EAC Compressed Data
      * (Corresponds to section C.3.5 of the OpenGL 4.4 core profile spec)
      */
     kR11_EAC_GrPixelConfig,
+
+    /**
+     * 12x12 ASTC Compressed Data
+     * ASTC stands for Adaptive Scalable Texture Compression. It is a technique
+     * that allows for a lot of customization in the compressed representataion
+     * of a block. The only thing fixed in the representation is the block size,
+     * which means that a texture that contains ASTC data must be treated as
+     * having RGBA values. However, there are single-channel encodings which set
+     * the alpha to opaque and all three RGB channels equal effectively making the
+     * compression format a single channel such as R11 EAC and LATC.
+     */
+    kASTC_12x12_GrPixelConfig,
+
     /**
      * Byte order is r, g, b, a.  This color format is 32 bits per channel
      */
     kRGBA_float_GrPixelConfig,
     kLast_GrPixelConfig = kRGBA_float_GrPixelConfig
 };
 static const int kGrPixelConfigCnt = kLast_GrPixelConfig + 1;
 
 // Aliases for pixel configs that match skia's byte order.
 #ifndef SK_CPU_LENDIAN
     #error "Skia gpu currently assumes little endian"
 #endif
 #if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
     static const GrPixelConfig kSkia8888_GrPixelConfig = kBGRA_8888_GrPixelConfig;
 #elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
     static const GrPixelConfig kSkia8888_GrPixelConfig = kRGBA_8888_GrPixelConfig;
 #else
     #error "SK_*32_SHIFT values must correspond to GL_BGRA or GL_RGBA format."
 #endif
 
 // Returns true if the pixel config is a GPU-specific compressed format
 // representation.
 static inline bool GrPixelConfigIsCompressed(GrPixelConfig config) {
     switch (config) {
         case kETC1_GrPixelConfig:
         case kLATC_GrPixelConfig:
         case kR11_EAC_GrPixelConfig:
+        case kASTC_12x12_GrPixelConfig:
             return true;
         default:
             return false;
     }
 }
 
 // Returns true if the pixel config is 32 bits per pixel
 static inline bool GrPixelConfigIs8888(GrPixelConfig config) {
     switch (config) {
         case kRGBA_8888_GrPixelConfig:
@@ skipping 344 matching lines @@
     SkASSERT(GrPixelConfigIsCompressed(config));
 
     switch (config) {
         case kR11_EAC_GrPixelConfig:
         case kLATC_GrPixelConfig:
         case kETC1_GrPixelConfig:
             SkASSERT((width & 3) == 0);
             SkASSERT((height & 3) == 0);
             return (width >> 2) * (height >> 2) * 8;
 
+        case kASTC_12x12_GrPixelConfig:
+            SkASSERT((width % 12) == 0);
+            SkASSERT((height % 12) == 0);
+            return (width / 12) * (height / 12) * 16;
+
         default:
             SkFAIL("Unknown compressed pixel config");
             return 4 * width * height;
     }
 }
 
 /**
  * This value translates to reseting all the context state for any backend.
  */
 static const uint32_t kAll_GrBackendState = 0xffffffff;
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif