The Tor Browser: image/encoders/jpeg/nsJPEGEncoder.h@ca08bd8f51b2

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "imgIEncoder.h"

     8 #include "mozilla/ReentrantMonitor.h"

     9 #include "mozilla/Attributes.h"

    11 #include "nsCOMPtr.h"

    13 // needed for JPEG library

    14 #include <stdio.h>

    16 extern "C" {

    17 #include "jpeglib.h"

    18 }

    20 #define NS_JPEGENCODER_CID \

    21 { /* ac2bb8fe-eeeb-4572-b40f-be03932b56e0 */         \

    22      0xac2bb8fe,                                     \

    23      0xeeeb,                                         \

    24      0x4572,                                         \

    25     {0xb4, 0x0f, 0xbe, 0x03, 0x93, 0x2b, 0x56, 0xe0} \

    26 }

    28 // Provides JPEG encoding functionality. Use InitFromData() to do the

    29 // encoding. See that function definition for encoding options.

    31 class nsJPEGEncoder MOZ_FINAL : public imgIEncoder

    32 {

    33   typedef mozilla::ReentrantMonitor ReentrantMonitor;

    34 public:

    35   NS_DECL_THREADSAFE_ISUPPORTS

    36   NS_DECL_IMGIENCODER

    37   NS_DECL_NSIINPUTSTREAM

    38   NS_DECL_NSIASYNCINPUTSTREAM

    40   nsJPEGEncoder();

    42 private:

    43   ~nsJPEGEncoder();

    45 protected:

    47   void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,

    48                           uint32_t aPixelWidth);

    49   void ConvertRGBARow(const uint8_t* aSrc, uint8_t* aDest, uint32_t aPixelWidth);

    51   static void initDestination(jpeg_compress_struct* cinfo);

    52   static boolean emptyOutputBuffer(jpeg_compress_struct* cinfo);

    53   static void termDestination(jpeg_compress_struct* cinfo);

    55   static void errorExit(jpeg_common_struct* cinfo);

    57   void NotifyListener();

    59   bool mFinished;

    61   // image buffer

    62   uint8_t* mImageBuffer;

    63   uint32_t mImageBufferSize;

    64   uint32_t mImageBufferUsed;

    66   uint32_t mImageBufferReadPoint;

    68   nsCOMPtr<nsIInputStreamCallback> mCallback;

    69   nsCOMPtr<nsIEventTarget> mCallbackTarget;

    70   uint32_t mNotifyThreshold;

    72   /*

    73     nsJPEGEncoder is designed to allow one thread to pump data into it while another

    74     reads from it.  We lock to ensure that the buffer remains append-only while

    75     we read from it (that it is not realloced) and to ensure that only one thread

    76     dispatches a callback for each call to AsyncWait.

    77    */

    78   ReentrantMonitor mReentrantMonitor;

    79 };

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