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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_image_encoders_jpeg_nsJPEGEncoder_h
#define mozilla_image_encoders_jpeg_nsJPEGEncoder_h
#include "imgIEncoder.h"
#include "mozilla/ReentrantMonitor.h"
#include "mozilla/Attributes.h"
#include "nsCOMPtr.h"
// needed for JPEG library
#include <stdio.h>
extern "C" {
#include "jpeglib.h"
}
#define NS_JPEGENCODER_CID \
{ \
/* ac2bb8fe-eeeb-4572-b40f-be03932b56e0 */ \
0xac2bb8fe, \
0xeeeb, \
0x4572, \
{0xb4, 0x0f, 0xbe, 0x03, 0x93, 0x2b, 0x56, 0xe0} \
}
// Provides JPEG encoding functionality. Use InitFromData() to do the
// encoding. See that function definition for encoding options.
class nsJPEGEncoder final : public imgIEncoder
{
typedef mozilla::ReentrantMonitor ReentrantMonitor;
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_IMGIENCODER
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIASYNCINPUTSTREAM
nsJPEGEncoder();
private:
~nsJPEGEncoder();
protected:
void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
uint32_t aPixelWidth);
void ConvertRGBARow(const uint8_t* aSrc, uint8_t* aDest,
uint32_t aPixelWidth);
static void initDestination(jpeg_compress_struct* cinfo);
static boolean emptyOutputBuffer(jpeg_compress_struct* cinfo);
static void termDestination(jpeg_compress_struct* cinfo);
static void errorExit(jpeg_common_struct* cinfo);
void NotifyListener();
bool mFinished;
// image buffer
uint8_t* mImageBuffer;
uint32_t mImageBufferSize;
uint32_t mImageBufferUsed;
uint32_t mImageBufferReadPoint;
nsCOMPtr<nsIInputStreamCallback> mCallback;
nsCOMPtr<nsIEventTarget> mCallbackTarget;
uint32_t mNotifyThreshold;
// nsJPEGEncoder is designed to allow one thread to pump data into it while
// another reads from it. We lock to ensure that the buffer remains
// append-only while we read from it (that it is not realloced) and to ensure
// that only one thread dispatches a callback for each call to AsyncWait.
ReentrantMonitor mReentrantMonitor;
};
#endif // mozilla_image_encoders_jpeg_nsJPEGEncoder_h
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