Fix assert in GrMaskFormatBytesPerPixel.

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 210 matching lines @@
     kLastPublicGrBlendCoeff = kIConstA_GrBlendCoeff,
 };
 static const int kPublicGrBlendCoeffCount = kLastPublicGrBlendCoeff + 1;
 
 /**
  *  Formats for masks, used by the font cache.
  *  Important that these are 0-based.
  */
 enum GrMaskFormat {
     kA8_GrMaskFormat,    //!< 1-byte per pixel
-    kA565_GrMaskFormat,  //!< 2-bytes per pixel
+    kA565_GrMaskFormat,  //!< 2-bytes per pixel, RGB represent 3-channel LCD coverage
     kARGB_GrMaskFormat,  //!< 4-bytes per pixel, color format
 
     kLast_GrMaskFormat = kARGB_GrMaskFormat
 };
 static const int kMaskFormatCount = kLast_GrMaskFormat + 1;
 
 /**
  *  Return the number of bytes-per-pixel for the specified mask format.
  */
 static inline int GrMaskFormatBytesPerPixel(GrMaskFormat format) {
-    SkASSERT((unsigned)format <= 3);
+    SkASSERT((unsigned)format < kMaskFormatCount);
     // kA8   (0) -> 1
     // kA565 (1) -> 2
-    // kARGB (3) -> 4
+    // kARGB (2) -> 4
     static const int sBytesPerPixel[] = { 1, 2, 4 };
     SK_COMPILE_ASSERT(SK_ARRAY_COUNT(sBytesPerPixel) == kMaskFormatCount, array_size_mismatch);
+    SK_COMPILE_ASSERT(kA8_GrMaskFormat == 0, enum_order_dependency);
+    SK_COMPILE_ASSERT(kA565_GrMaskFormat == 1, enum_order_dependency);
+    SK_COMPILE_ASSERT(kARGB_GrMaskFormat == 2, enum_order_dependency);
 
     return sBytesPerPixel[(int) format];
 }
 
 /**
  * Pixel configurations.
  */
 enum GrPixelConfig {
     kUnknown_GrPixelConfig,
     kAlpha_8_GrPixelConfig,
@@ skipping 455 matching lines @@
 public:
     GrAutoMalloc() : INHERITED() {}
     explicit GrAutoMalloc(size_t size) : INHERITED(size) {}
     virtual ~GrAutoMalloc() {}
 private:
     typedef GrAutoMallocBaseType INHERITED;
 };
 
 #undef GrAutoMallocBaseType
 #endif