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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMipMap_DEFINED
#define SkMipMap_DEFINED
#include "SkCachedData.h"
#include "SkPixmap.h"
#include "SkScalar.h"
#include "SkSize.h"
class SkBitmap;
class SkDiscardableMemory;
typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes);
class SkMipMap : public SkCachedData {
public:
static SkMipMap* Build(const SkPixmap& src, SkDiscardableFactoryProc);
static SkMipMap* Build(const SkBitmap& src, SkDiscardableFactoryProc);
// Determines how many levels a SkMipMap will have without creating that mipmap.
static int ComputeLevelCount(int baseWidth, int baseHeight);
// Determines the size of a given mipmap level.
static SkSize ComputeLevelSize(int baseWidth, int baseHeight, int level);
struct Level {
SkPixmap fPixmap;
SkSize fScale; // < 1.0
};
bool extractLevel(const SkSize& scale, Level*) const;
int countLevels() const;
bool getLevel(int index, Level*) const;
protected:
void onDataChange(void* oldData, void* newData) override {
fLevels = (Level*)newData; // could be nullptr
}
private:
Level* fLevels;
int fCount;
// we take ownership of levels, and will free it with sk_free()
SkMipMap(void* malloc, size_t size) : INHERITED(malloc, size) {}
SkMipMap(size_t size, SkDiscardableMemory* dm) : INHERITED(size, dm) {}
static size_t AllocLevelsSize(int levelCount, size_t pixelSize);
typedef SkCachedData INHERITED;
};
#endif
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