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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkMipMap_DEFINED | 8 #ifndef SkMipMap_DEFINED |
9 #define SkMipMap_DEFINED | 9 #define SkMipMap_DEFINED |
10 | 10 |
11 #include "SkCachedData.h" | 11 #include "SkCachedData.h" |
12 #include "SkPixmap.h" | 12 #include "SkPixmap.h" |
13 #include "SkScalar.h" | 13 #include "SkScalar.h" |
14 #include "SkSize.h" | 14 #include "SkSize.h" |
15 | 15 |
16 class SkBitmap; | 16 class SkBitmap; |
17 class SkDiscardableMemory; | 17 class SkDiscardableMemory; |
18 | 18 |
19 typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes); | 19 typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes); |
20 | 20 |
21 class SkMipMap : public SkCachedData { | 21 class SkMipMap : public SkCachedData { |
22 public: | 22 public: |
23 static SkMipMap* Build(const SkPixmap& src, SkDiscardableFactoryProc); | 23 static SkMipMap* Build(const SkPixmap& src, SkDiscardableFactoryProc); |
24 static SkMipMap* Build(const SkBitmap& src, SkDiscardableFactoryProc); | 24 static SkMipMap* Build(const SkBitmap& src, SkDiscardableFactoryProc); |
25 | 25 |
| 26 // This function lets you determine how many levels a SkMipMap will have wit
hout |
| 27 // creating that mipmap. |
| 28 static int ComputeLevelCount(int baseWidth, int baseHeight); |
| 29 |
26 struct Level { | 30 struct Level { |
27 SkPixmap fPixmap; | 31 SkPixmap fPixmap; |
28 SkSize fScale; // < 1.0 | 32 SkSize fScale; // < 1.0 |
29 }; | 33 }; |
30 | 34 |
31 bool extractLevel(const SkSize& scale, Level*) const; | 35 bool extractLevel(const SkSize& scale, Level*) const; |
| 36 int countLevels() const; |
| 37 bool getLevel(int index, Level*) const; |
32 | 38 |
33 protected: | 39 protected: |
34 void onDataChange(void* oldData, void* newData) override { | 40 void onDataChange(void* oldData, void* newData) override { |
35 fLevels = (Level*)newData; // could be nullptr | 41 fLevels = (Level*)newData; // could be nullptr |
36 } | 42 } |
37 | 43 |
38 private: | 44 private: |
39 Level* fLevels; | 45 Level* fLevels; |
40 int fCount; | 46 int fCount; |
41 | 47 |
42 // we take ownership of levels, and will free it with sk_free() | 48 // we take ownership of levels, and will free it with sk_free() |
43 SkMipMap(void* malloc, size_t size) : INHERITED(malloc, size) {} | 49 SkMipMap(void* malloc, size_t size) : INHERITED(malloc, size) {} |
44 SkMipMap(size_t size, SkDiscardableMemory* dm) : INHERITED(size, dm) {} | 50 SkMipMap(size_t size, SkDiscardableMemory* dm) : INHERITED(size, dm) {} |
45 | 51 |
46 static size_t AllocLevelsSize(int levelCount, size_t pixelSize); | 52 static size_t AllocLevelsSize(int levelCount, size_t pixelSize); |
47 | 53 |
48 typedef SkCachedData INHERITED; | 54 typedef SkCachedData INHERITED; |
49 }; | 55 }; |
50 | 56 |
51 #endif | 57 #endif |
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