Initial work to get ETC1 data up to the GPU

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 623 matching lines @@
     kStencil_GrGLBackendState          = 1 << 6,
     kPixelStore_GrGLBackendState       = 1 << 7,
     kProgram_GrGLBackendState          = 1 << 8,
     kFixedFunction_GrGLBackendState    = 1 << 9,
     kMisc_GrGLBackendState             = 1 << 10,
     kPathRendering_GrGLBackendState    = 1 << 11,
     kALL_GrGLBackendState              = 0xffff
 };
 
 /**
+ * Returns the data size for the given compressed pixel config
+ */ 
+static inline size_t GrCompressedFormatDataSize(GrPixelConfig config,
+                                                int width, int height) {
+    SkASSERT(GrPixelConfigIsCompressed(config));
+
+    switch (config) {
+        case kLATC_GrPixelConfig:
+        case kETC1_GrPixelConfig:
+            SkASSERT((width & 3) == 0);
+            SkASSERT((height & 3) == 0);
+            return (width >> 2) * (height >> 2) * 8;
+
+        default:
+            // Unknown pixel config...

[robertphillips, 2014/05/30 15:00:22]

SkFAIL here?

[krajcevski, 2014/05/30 16:21:50]

Done.

+            SkASSERT(false);
+            return 4 * width * height;
+    }
+}
+
+/**
  * This value translates to reseting all the context state for any backend.
  */
 static const uint32_t kAll_GrBackendState = 0xffffffff;
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #endif