c250d2e4ab
The encoder comes with tests to check that the encoding/decoding operations between ETC encoded bitmaps and ARGB bitmaps are sane. R=bsalomon@google.com, robertphillips@google.com Author: krajcevski@google.com Review URL: https://codereview.chromium.org/312353003
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkImageEncoder_DEFINED
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#define SkImageEncoder_DEFINED
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#include "SkTypes.h"
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#include "SkTRegistry.h"
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class SkBitmap;
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class SkData;
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class SkWStream;
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class SkImageEncoder {
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public:
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enum Type {
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kUnknown_Type,
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kBMP_Type,
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kGIF_Type,
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kICO_Type,
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kJPEG_Type,
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kPNG_Type,
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kWBMP_Type,
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kWEBP_Type,
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kKTX_Type,
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};
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static SkImageEncoder* Create(Type);
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virtual ~SkImageEncoder();
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/* Quality ranges from 0..100 */
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enum {
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kDefaultQuality = 80
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};
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/**
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* Encode bitmap 'bm', returning the results in an SkData, at quality level
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* 'quality' (which can be in range 0-100). If the bitmap cannot be
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* encoded, return null. On success, the caller is responsible for
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* calling unref() on the data when they are finished.
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*/
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SkData* encodeData(const SkBitmap&, int quality);
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/**
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* Encode bitmap 'bm' in the desired format, writing results to
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* file 'file', at quality level 'quality' (which can be in range
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* 0-100). Returns false on failure.
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*/
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bool encodeFile(const char file[], const SkBitmap& bm, int quality);
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/**
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* Encode bitmap 'bm' in the desired format, writing results to
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* stream 'stream', at quality level 'quality' (which can be in
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* range 0-100). Returns false on failure.
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*/
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bool encodeStream(SkWStream* stream, const SkBitmap& bm, int quality);
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static SkData* EncodeData(const SkBitmap&, Type, int quality);
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static bool EncodeFile(const char file[], const SkBitmap&, Type,
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int quality);
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static bool EncodeStream(SkWStream*, const SkBitmap&, Type,
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int quality);
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protected:
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/**
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* Encode bitmap 'bm' in the desired format, writing results to
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* stream 'stream', at quality level 'quality' (which can be in
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* range 0-100).
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*
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* This must be overridden by each SkImageEncoder implementation.
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*/
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virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) = 0;
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};
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// This macro declares a global (i.e., non-class owned) creation entry point
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// for each encoder (e.g., CreateJPEGImageEncoder)
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#define DECLARE_ENCODER_CREATOR(codec) \
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SkImageEncoder *Create ## codec ();
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// This macro defines the global creation entry point for each encoder. Each
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// encoder implementation that registers with the encoder factory must call it.
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#define DEFINE_ENCODER_CREATOR(codec) \
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SkImageEncoder *Create ## codec () { \
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return SkNEW( Sk ## codec ); \
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}
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// All the encoders known by Skia. Note that, depending on the compiler settings,
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// not all of these will be available
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/** An ARGBImageEncoder will always write out
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* bitmap.width() * bitmap.height() * 4
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* bytes.
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*/
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DECLARE_ENCODER_CREATOR(ARGBImageEncoder);
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DECLARE_ENCODER_CREATOR(JPEGImageEncoder);
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DECLARE_ENCODER_CREATOR(PNGImageEncoder);
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DECLARE_ENCODER_CREATOR(KTXImageEncoder);
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DECLARE_ENCODER_CREATOR(WEBPImageEncoder);
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// Typedef to make registering encoder callback easier
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// This has to be defined outside SkImageEncoder. :(
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typedef SkTRegistry<SkImageEncoder*(*)(SkImageEncoder::Type)> SkImageEncoder_EncodeReg;
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#endif
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