Creating functions for uploading a mipmapped texture.

src/core/SkMipMap.h

-/*
- * 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 "SkScalar.h"
-
-class SkBitmap;
-class SkDiscardableMemory;
-
-typedef SkDiscardableMemory* (*SkDiscardableFactoryProc)(size_t bytes);
-
-class SkMipMap : public SkCachedData {
-public:
-    static SkMipMap* Build(const SkBitmap& src, SkDiscardableFactoryProc);
-
-    struct Level {
-        void*       fPixels;
-        uint32_t    fRowBytes;
-        uint32_t    fWidth, fHeight;
-        float       fScale; // < 1.0
-    };
-
-    bool extractLevel(SkScalar scale, Level*) const;
-
-protected:
-    void onDataChange(void* oldData, void* newData) override {
-        fLevels = (Level*)newData; // could be NULL
-    }
-
-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