1 /*
2  * Copyright 2013 Google Inc.
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 #ifndef SkMipMap_DEFINED
9 #define SkMipMap_DEFINED
10 
11 #include "SkCachedData.h"
12 #include "SkScalar.h"
13 
14 class SkBitmap;
15 class SkDiscardableMemory;
16 
17 typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes);
18 
19 class SkMipMap : public SkCachedData {
20 public:
21     static SkMipMap* Build(const SkBitmap& src, SkDiscardableFactoryProc);
22 
23     struct Level {
24         void*       fPixels;
25         uint32_t    fRowBytes;
26         uint32_t    fWidth, fHeight;
27         float       fScale; // < 1.0
28     };
29 
30     bool extractLevel(SkScalar scale, Level*) const;
31 
32 protected:
onDataChange(void * oldData,void * newData)33     void onDataChange(void* oldData, void* newData) override {
34         fLevels = (Level*)newData; // could be NULL
35     }
36 
37 private:
38     Level*  fLevels;
39     int     fCount;
40 
41     // we take ownership of levels, and will free it with sk_free()
SkMipMap(void * malloc,size_t size)42     SkMipMap(void* malloc, size_t size) : INHERITED(malloc, size) {}
SkMipMap(size_t size,SkDiscardableMemory * dm)43     SkMipMap(size_t size, SkDiscardableMemory* dm) : INHERITED(size, dm) {}
44 
45     static size_t AllocLevelsSize(int levelCount, size_t pixelSize);
46 
47     typedef SkCachedData INHERITED;
48 };
49 
50 #endif
51