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1 /* | |
2 * Copyright 2015 The Android Open Source Project | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #include "SkTypes.h" | |
9 | |
10 /* | |
11 * Helper class to determine the destination y-values for interlaced gifs | |
12 */ | |
13 class SkGifInterlaceIter : SkNoncopyable { | |
14 public: | |
15 | |
16 explicit SkGifInterlaceIter(int32_t height); | |
17 | |
18 /* | |
19 * Get the next destination y-value | |
20 */ | |
21 int32_t nextY(); | |
22 | |
23 private: | |
24 | |
25 /* | |
26 * Updates the iterator to prepare the next y-value | |
27 */ | |
28 void prepareY(); | |
29 | |
30 const int32_t fHeight; | |
31 int32_t fCurrY; | |
32 int32_t fDeltaY; | |
33 const uint8_t* fStartYPtr; | |
34 const uint8_t* fDeltaYPtr; | |
35 }; | |
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