1 2 /* 3 * Copyright 2012 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #ifndef SkBitmapChecksummer_DEFINED 10 #define SkBitmapChecksummer_DEFINED 11 12 #include "SkBitmap.h" 13 #include "SkBitmapTransformer.h" 14 15 /** 16 * Static class that can generate checksums from SkBitmaps. 17 */ 18 class SkBitmapChecksummer { 19 public: 20 /** 21 * Returns a 64-bit checksum of the pixels in this bitmap. 22 * 23 * If this is unable to compute the checksum for some reason, 24 * it returns 0. 25 * 26 * Note: depending on the bitmap config, we may need to create an 27 * intermediate SkBitmap and copy the pixels over to it... so in some 28 * cases, performance and memory usage can suffer. 29 */ 30 static uint64_t Compute64(const SkBitmap& bitmap); 31 32 private: 33 static uint64_t Compute64Internal(const SkBitmap& bitmap, 34 const SkBitmapTransformer& transformer); 35 }; 36 37 #endif 38
