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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 SkImageGenerator_DEFINED
#define SkImageGenerator_DEFINED
#include "SkImageInfo.h"
#include "SkColor.h"
class SkBitmap;
class SkData;
class SkImageGenerator;
/**
* Takes ownership of SkImageGenerator. If this method fails for
* whatever reason, it will return false and immediatetely delete
* the generator. If it succeeds, it will modify destination
* bitmap.
*
* If generator is NULL, will safely return false.
*
* If this fails or when the SkDiscardablePixelRef that is
* installed into destination is destroyed, it will call
* SkDELETE() on the generator. Therefore, generator should be
* allocated with SkNEW() or SkNEW_ARGS().
*
* @param destination Upon success, this bitmap will be
* configured and have a pixelref installed.
*
* @return true iff successful.
*/
SK_API bool SkInstallDiscardablePixelRef(SkImageGenerator*, SkBitmap* destination);
/**
* Purges all unlocked discardable memory in Skia's global
* discardable memory pool.
*/
SK_API void SkPurgeGlobalDiscardableMemoryPool();
/**
* An interface that allows a purgeable PixelRef (such as a
* SkDiscardablePixelRef) to decode and re-decode an image as needed.
*/
class SK_API SkImageGenerator {
public:
/**
* The PixelRef which takes ownership of this SkImageGenerator
* will call the image generator's destructor.
*/
virtual ~SkImageGenerator() { }
#ifdef SK_SUPPORT_LEGACY_IMAGEGENERATORAPI
virtual SkData* refEncodedData() { return this->onRefEncodedData(); }
virtual bool getInfo(SkImageInfo* info) { return this->onGetInfo(info); }
virtual bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes) {
return this->onGetPixels(info, pixels, rowBytes, NULL, NULL);
}
#else
/**
* Return a ref to the encoded (i.e. compressed) representation,
* of this data.
*
* If non-NULL is returned, the caller is responsible for calling
* unref() on the data when it is finished.
*/
SkData* refEncodedData() { return this->onRefEncodedData(); }
/**
* Return some information about the image, allowing the owner of
* this object to allocate pixels.
*
* Repeated calls to this function should give the same results,
* allowing the PixelRef to be immutable.
*
* @return false if anything goes wrong.
*/
bool getInfo(SkImageInfo* info);
/**
* Decode into the given pixels, a block of memory of size at
* least (info.fHeight - 1) * rowBytes + (info.fWidth *
* bytesPerPixel)
*
* Repeated calls to this function should give the same results,
* allowing the PixelRef to be immutable.
*
* @param info A description of the format (config, size)
* expected by the caller. This can simply be identical
* to the info returned by getInfo().
*
* This contract also allows the caller to specify
* different output-configs, which the implementation can
* decide to support or not.
*
* If info is kIndex8_SkColorType, then the caller must provide storage for up to 256
* SkPMColor values in ctable. On success the generator must copy N colors into that storage,
* (where N is the logical number of table entries) and set ctableCount to N.
*
* If info is not kIndex8_SkColorType, then the last two parameters may be NULL. If ctableCount
* is not null, it will be set to 0.
*
* @return false if anything goes wrong or if the image info is
* unsupported.
*/
bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount);
/**
* Simplified version of getPixels() that asserts that info is NOT kIndex8_SkColorType.
*/
bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes);
#endif
/**
* If planes or rowBytes is NULL or if any entry in planes is NULL or if any entry in rowBytes
* is 0, this imagegenerator should output the sizes and return true if it can efficiently
* return YUV planar data. If it cannot, it should return false. Note that either planes and
* rowBytes are both fully defined and non NULL/non 0 or they are both NULL or have NULL or 0
* entries only. Having only partial planes/rowBytes information is not supported.
*
* If all planes and rowBytes entries are non NULL or non 0, then it should copy the
* associated YUV data into those planes of memory supplied by the caller. It should validate
* that the sizes match what it expected. If the sizes do not match, it should return false.
*/
bool getYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]);
protected:
virtual SkData* onRefEncodedData();
virtual bool onGetInfo(SkImageInfo* info);
virtual bool onGetPixels(const SkImageInfo& info,
void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount);
virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]);
};
#endif // SkImageGenerator_DEFINED
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