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