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/*
* Copyright 2008 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMallocPixelRef_DEFINED
#define SkMallocPixelRef_DEFINED
#include "SkPixelRef.h"
#include "SkRefCnt.h"
#include "SkTypes.h"
class SkData;
struct SkImageInfo;
/** We explicitly use the same allocator for our pixels that SkMask does,
so that we can freely assign memory allocated by one class to the other.
*/
class SK_API SkMallocPixelRef : public SkPixelRef {
public:
/**
* Return a new SkMallocPixelRef with the provided pixel storage, rowBytes,
* and optional colortable. The caller is responsible for managing the
* lifetime of the pixel storage buffer, as this pixelref will not try
* to delete it.
*
* Returns NULL on failure.
*/
static sk_sp<SkPixelRef> MakeDirect(const SkImageInfo&, void* addr, size_t rowBytes);
/**
* Return a new SkMallocPixelRef, automatically allocating storage for the
* pixels. If rowBytes are 0, an optimal value will be chosen automatically.
* If rowBytes is > 0, then it will be respected, or NULL will be returned
* if rowBytes is invalid for the specified info.
*
* This pixelref will ref() the specified colortable (if not NULL).
*
* Returns NULL on failure.
*/
static sk_sp<SkPixelRef> MakeAllocate(const SkImageInfo&, size_t rowBytes);
/**
* Identical to MakeAllocate, except all pixel bytes are zeroed.
*/
static sk_sp<SkPixelRef> MakeZeroed(const SkImageInfo&, size_t rowBytes);
/**
* Return a new SkMallocPixelRef with the provided pixel storage,
* rowBytes, and optional colortable. On destruction, ReleaseProc
* will be called.
*
* If ReleaseProc is NULL, the pixels will never be released. This
* can be useful if the pixels were stack allocated. However, such an
* SkMallocPixelRef must not live beyond its pixels (e.g. by copying
* an SkBitmap pointing to it, or drawing to an SkPicture).
*
* Returns NULL on failure.
*/
typedef void (*ReleaseProc)(void* addr, void* context);
static sk_sp<SkPixelRef> MakeWithProc(const SkImageInfo& info, size_t rowBytes, void* addr,
ReleaseProc proc, void* context);
/**
* Return a new SkMallocPixelRef that will use the provided
* SkData, rowBytes, and optional colortable as pixel storage.
* The SkData will be ref()ed and on destruction of the PielRef,
* the SkData will be unref()ed.
*
* Returns NULL on failure.
*/
static sk_sp<SkPixelRef> MakeWithData(const SkImageInfo&, size_t rowBytes, sk_sp<SkData> data);
protected:
~SkMallocPixelRef() override;
private:
// Uses alloc to implement NewAllocate or NewZeroed.
static sk_sp<SkPixelRef> MakeUsing(void*(*alloc)(size_t),
const SkImageInfo&,
size_t rowBytes);
ReleaseProc fReleaseProc;
void* fReleaseProcContext;
SkMallocPixelRef(const SkImageInfo&, void* addr, size_t rb, ReleaseProc proc, void* context);
typedef SkPixelRef INHERITED;
};
#endif
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