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
14class SkBitmap;
15class SkDiscardableMemory;
16
17typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes);
18
19class SkMipMap : public SkCachedData {
20public:
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
32protected:
33    void onDataChange(void* oldData, void* newData) override {
34        fLevels = (Level*)newData; // could be NULL
35    }
36
37private:
38    Level*  fLevels;
39    int     fCount;
40
41    // we take ownership of levels, and will free it with sk_free()
42    SkMipMap(void* malloc, size_t size) : INHERITED(malloc, size) {}
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