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Diffstat (limited to 'image/encoders/jpeg/nsJPEGEncoder.h')
-rw-r--r-- | image/encoders/jpeg/nsJPEGEncoder.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/image/encoders/jpeg/nsJPEGEncoder.h b/image/encoders/jpeg/nsJPEGEncoder.h new file mode 100644 index 000000000..2bcf5c2f3 --- /dev/null +++ b/image/encoders/jpeg/nsJPEGEncoder.h @@ -0,0 +1,84 @@ +/* -*- 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 |