/*
* 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 "include/core/SkData.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkYUVAPixmaps.h"
#include "include/private/base/SkAPI.h"
#include <cstddef>
#include <cstdint>
class SkRecorder;
class SK_API SkImageGenerator {
public :
/**
* The PixelRef which takes ownership of this SkImageGenerator
* will call the image generator ' s destructor .
*/
virtual ~SkImageGenerator() { }
uint32_t uniqueID() const { return fUniqueID; }
/**
* 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 .
*/
sk_sp<const SkData> refEncodedData() { return this ->onRefEncodedData(); }
/**
* Return the ImageInfo associated with this generator .
*/
const SkImageInfo& getInfo() const { return fInfo; }
/**
* Can this generator be used to produce images that will be drawable to the specified context
* ( or to CPU , if context is nullptr ) ?
*/
bool isValid(SkRecorder* recorder) const { return this ->onIsValid(recorder); }
/**
* Will this generator produce protected content
*/
bool isProtected() const {
return this ->onIsProtected();
}
/**
* 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
* 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 .
*
* A size that does not match getInfo ( ) implies a request
* to scale . If the generator cannot perform this scale ,
* it will return false .
*
* @ return true on success .
*/
bool getPixels(const SkImageInfo& info, void * pixels, size_t rowBytes);
bool getPixels(const SkPixmap& pm) {
return this ->getPixels(pm.info(), pm.writable_addr(), pm.rowBytes());
}
/**
* If decoding to YUV is supported , this returns true . Otherwise , this
* returns false and the caller will ignore output parameter yuvaPixmapInfo .
*
* @ param supportedDataTypes Indicates the data type / planar config combinations that are
* supported by the caller . If the generator supports decoding to
* YUV ( A ) , but not as a type in supportedDataTypes , this method
* returns false .
* @ param yuvaPixmapInfo Output parameter that specifies the planar configuration , subsampling ,
* orientation , chroma siting , plane color types , and row bytes .
*/
bool queryYUVAInfo(const SkYUVAPixmapInfo::SupportedDataTypes& supportedDataTypes,
SkYUVAPixmapInfo* yuvaPixmapInfo) const ;
/**
* Returns true on success and false on failure .
* This always attempts to perform a full decode . To get the planar
* configuration without decoding use queryYUVAInfo ( ) .
*
* @ param yuvaPixmaps Contains preallocated pixmaps configured according to a successful call
* to queryYUVAInfo ( ) .
*/
bool getYUVAPlanes(const SkYUVAPixmaps& yuvaPixmaps);
virtual bool isTextureGenerator() const { return false; }
protected :
static constexpr int kNeedNewImageUniqueID = 0 ;
SkImageGenerator(const SkImageInfo& info, uint32_t uniqueId = kNeedNewImageUniqueID);
virtual sk_sp<const SkData> onRefEncodedData() { return nullptr; }
struct Options {};
virtual bool onGetPixels(const SkImageInfo&, void *, size_t, const Options&) { return false; }
virtual bool onIsValid(SkRecorder*) const { return true ; }
virtual bool onIsProtected() const { return false; }
virtual bool onQueryYUVAInfo(const SkYUVAPixmapInfo::SupportedDataTypes&,
SkYUVAPixmapInfo*) const { return false; }
virtual bool onGetYUVAPlanes(const SkYUVAPixmaps&) { return false; }
const SkImageInfo fInfo;
private :
const uint32_t fUniqueID;
SkImageGenerator(SkImageGenerator&&) = delete ;
SkImageGenerator(const SkImageGenerator&) = delete ;
SkImageGenerator& operator =(SkImageGenerator&&) = delete ;
SkImageGenerator& operator =(const SkImageGenerator&) = delete ;
};
#endif // SkImageGenerator_DEFINED
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