src/utils/SkBitmapChecksummer.h - Issue 14170010: rename SkBitmapChecksummer as SkBitmapHasher, and prepare for it to possibly use

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Side by Side Diff: src/utils/SkBitmapChecksummer.h

Issue 14170010: rename SkBitmapChecksummer as SkBitmapHasher, and prepare for it to possibly use (Closed) Base URL: http://skia.googlecode.com/svn/trunk/

Patch Set: sync_to_r8638 Created 7 years, 8 months ago

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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

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