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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkImageEncoder_DEFINED
#define SkImageEncoder_DEFINED
#include "SkTypes.h"
#include "SkTRegistry.h"
class SkBitmap;
class SkData;
class SkWStream;
class SkImageEncoder {
public:
enum Type {
kUnknown_Type,
kBMP_Type,
kGIF_Type,
kICO_Type,
kJPEG_Type,
kPNG_Type,
kWBMP_Type,
kWEBP_Type,
};
static SkImageEncoder* Create(Type);
virtual ~SkImageEncoder();
/* Quality ranges from 0..100 */
enum {
kDefaultQuality = 80
};
/**
* Encode bitmap 'bm', returning the results in an SkData, at quality level
* 'quality' (which can be in range 0-100). If the bitmap cannot be
* encoded, return null. On success, the caller is responsible for
* calling unref() on the data when they are finished.
*/
SkData* encodeData(const SkBitmap&, int quality);
/**
* Encode bitmap 'bm' in the desired format, writing results to
* file 'file', at quality level 'quality' (which can be in range
* 0-100). Returns false on failure.
*/
bool encodeFile(const char file[], const SkBitmap& bm, int quality);
/**
* Encode bitmap 'bm' in the desired format, writing results to
* stream 'stream', at quality level 'quality' (which can be in
* range 0-100). Returns false on failure.
*/
bool encodeStream(SkWStream* stream, const SkBitmap& bm, int quality);
static SkData* EncodeData(const SkBitmap&, Type, int quality);
static bool EncodeFile(const char file[], const SkBitmap&, Type,
int quality);
static bool EncodeStream(SkWStream*, const SkBitmap&, Type,
int quality);
protected:
/**
* Encode bitmap 'bm' in the desired format, writing results to
* stream 'stream', at quality level 'quality' (which can be in
* range 0-100).
*
* This must be overridden by each SkImageEncoder implementation.
*/
virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) = 0;
};
// This macro declares a global (i.e., non-class owned) creation entry point
// for each encoder (e.g., CreateJPEGImageEncoder)
#define DECLARE_ENCODER_CREATOR(codec) \
SkImageEncoder *Create ## codec ();
// This macro defines the global creation entry point for each encoder. Each
// encoder implementation that registers with the encoder factory must call it.
#define DEFINE_ENCODER_CREATOR(codec) \
SkImageEncoder *Create ## codec () { \
return SkNEW( Sk ## codec ); \
}
// All the encoders known by Skia. Note that, depending on the compiler settings,
// not all of these will be available
/** An ARGBImageEncoder will always write out
* bitmap.width() * bitmap.height() * 4
* bytes.
*/
DECLARE_ENCODER_CREATOR(ARGBImageEncoder);
DECLARE_ENCODER_CREATOR(JPEGImageEncoder);
DECLARE_ENCODER_CREATOR(PNGImageEncoder);
DECLARE_ENCODER_CREATOR(WEBPImageEncoder);
// Typedef to make registering encoder callback easier
// This has to be defined outside SkImageEncoder. :(
typedef SkTRegistry<SkImageEncoder*(*)(SkImageEncoder::Type)> SkImageEncoder_EncodeReg;
#endif
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