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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 SkDecodingImageGenerator_DEFINED
#define SkDecodingImageGenerator_DEFINED
#include "SkDiscardableMemory.h"
#include "SkImageGenerator.h"
#include "SkImageInfo.h"
class SkBitmap;
class SkStreamRewindable;
/**
* Calls into SkImageDecoder::DecodeMemoryToTarget to implement a
* SkImageGenerator
*/
class SkDecodingImageGenerator : public SkImageGenerator {
public:
/*
* The constructor will take a reference to the SkData. The
* destructor will unref() it.
*/
explicit SkDecodingImageGenerator(SkData* data);
/*
* The SkData version of this constructor is preferred. If the
* stream has an underlying SkData (such as a SkMemoryStream)
* pass that in.
*
* This object will unref the stream when done. Since streams
* have internal state (position), the caller should not pass a
* shared stream in. Pass either a new duplicated stream in or
* transfer ownership of the stream. In the latter case, be sure
* that there are no other consumers of the stream who will
* modify the stream's position. This constructor asserts
* stream->unique().
*
* For example:
* SkStreamRewindable* stream;
* ...
* SkImageGenerator* gen
* = SkNEW_ARGS(SkDecodingImageGenerator,
* (stream->duplicate()));
* ...
* SkDELETE(gen);
*/
explicit SkDecodingImageGenerator(SkStreamRewindable* stream);
virtual ~SkDecodingImageGenerator();
virtual SkData* refEncodedData() SK_OVERRIDE;
virtual bool getInfo(SkImageInfo* info) SK_OVERRIDE;
virtual bool getPixels(const SkImageInfo& info,
void* pixels,
size_t rowBytes) SK_OVERRIDE;
/**
* Install the SkData into the destination bitmap, using a new
* SkDiscardablePixelRef and a new SkDecodingImageGenerator.
*
* @param data Contains the encoded image data that will be used
* by the SkDecodingImageGenerator. Will be ref()ed.
*
* @param destination Upon success, this bitmap will be
* configured and have a pixelref installed.
*
* @param factory If not NULL, this object will be used as a
* source of discardable memory when decoding. If NULL, then
* SkDiscardableMemory::Create() will be called.
*
* @return true iff successful.
*/
static bool Install(SkData* data, SkBitmap* destination,
SkDiscardableMemory::Factory* factory = NULL);
/**
* Install the stream into the destination bitmap, using a new
* SkDiscardablePixelRef and a new SkDecodingImageGenerator.
*
* The SkData version of this function is preferred. If the
* stream has an underlying SkData (such as a SkMemoryStream)
* pass that in.
*
* @param stream The source of encoded data that will be passed
* to the decoder. The installed SkDecodingImageGenerator will
* unref the stream when done. If false is returned, this
* function will perform the unref. Since streams have internal
* state (position), the caller should not pass a shared stream
* in. Pass either a new duplicated stream in or transfer
* ownership of the stream. In the latter case, be sure that
* there are no other consumers of the stream who will modify the
* stream's position. This function will fail if
* (!stream->unique()).
*
* @param destination Upon success, this bitmap will be
* configured and have a pixelref installed.
*
* @param factory If not NULL, this object will be used as a
* source of discardable memory when decoding. If NULL, then
* SkDiscardableMemory::Create() will be called.
*
* @return true iff successful.
*/
static bool Install(SkStreamRewindable* stream, SkBitmap* destination,
SkDiscardableMemory::Factory* factory = NULL);
private:
SkData* fData;
SkStreamRewindable* fStream;
SkImageInfo fInfo;
bool fHasInfo;
bool fDoCopyTo;
};
#endif // SkDecodingImageGenerator_DEFINED
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