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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAutoPixmapStorage_DEFINED
#define SkAutoPixmapStorage_DEFINED
#include "SkMalloc.h"
#include "SkPixmap.h"
class SK_API SkAutoPixmapStorage : public SkPixmap {
public:
SkAutoPixmapStorage();
~SkAutoPixmapStorage();
/**
* Leave the moved-from object in a free-but-valid state.
*/
SkAutoPixmapStorage& operator=(SkAutoPixmapStorage&& other);
/**
* Try to allocate memory for the pixels needed to match the specified Info. On success
* return true and fill out the pixmap to point to that memory. The storage will be freed
* when this object is destroyed, or if another call to tryAlloc() or alloc() is made.
*
* On failure, return false and reset() the pixmap to empty.
*/
bool tryAlloc(const SkImageInfo&);
/**
* Allocate memory for the pixels needed to match the specified Info and fill out the pixmap
* to point to that memory. The storage will be freed when this object is destroyed,
* or if another call to tryAlloc() or alloc() is made.
*
* If the memory cannot be allocated, calls sk_throw().
*/
void alloc(const SkImageInfo&);
/**
* Gets the size and optionally the rowBytes that would be allocated by SkAutoPixmapStorage if
* alloc/tryAlloc was called.
*/
static size_t AllocSize(const SkImageInfo& info, size_t* rowBytes);
/**
* Returns an SkData object wrapping the allocated pixels memory, and resets the pixmap.
* If the storage hasn't been allocated, the result is NULL.
*/
const SkData* SK_WARN_UNUSED_RESULT detachPixelsAsData();
// We wrap these so we can clear our internal storage
void reset() {
this->freeStorage();
this->INHERITED::reset();
}
void reset(const SkImageInfo& info, const void* addr, size_t rb, SkColorTable* ctable = NULL) {
this->freeStorage();
this->INHERITED::reset(info, addr, rb, ctable);
}
void reset(const SkImageInfo& info) {
this->freeStorage();
this->INHERITED::reset(info);
}
bool SK_WARN_UNUSED_RESULT reset(const SkMask& mask) {
this->freeStorage();
return this->INHERITED::reset(mask);
}
private:
void* fStorage;
void freeStorage() {
sk_free(fStorage);
fStorage = nullptr;
}
typedef SkPixmap INHERITED;
};
#endif
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