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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkJpegEncoder_DEFINED
#define SkJpegEncoder_DEFINED
#include "SkPixmap.h"
#include "SkTypes.h"
class SkWStream;
class SkJpegEncoder : SkNoncopyable {
public:
// TODO (skbug.com/1501):
// Since jpegs are always opaque, this encoder ignores the alpha channel and treats the
// pixels as opaque.
// Another possible behavior is to blend the pixels onto opaque black. We'll need to add
// an option for this - and an SkTransferFunctionBehavior.
struct Options {
/**
* |fQuality| must be in [0, 100] where 0 corresponds to the lowest quality.
*/
int fQuality = 100;
};
/**
* Encode the |src| pixels to the |dst| stream.
* |options| may be used to control the encoding behavior.
*
* Returns true on success. Returns false on an invalid or unsupported |src|.
*/
static bool Encode(SkWStream* dst, const SkPixmap& src, const Options& options);
/**
* Create a jpeg encoder that will encode the |src| pixels to the |dst| stream.
* |options| may be used to control the encoding behavior.
*
* |dst| is unowned but must remain valid for the lifetime of the object.
*
* This returns nullptr on an invalid or unsupported |src|.
*/
static std::unique_ptr<SkJpegEncoder> Make(SkWStream* dst, const SkPixmap& src,
const Options& options);
/**
* Encode |numRows| rows of input. If the caller requests more rows than are remaining
* in the src, this will encode all of the remaining rows. |numRows| must be greater
* than zero.
*/
bool encodeRows(int numRows);
};
#endif
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