modules/libpr0n/encoders/jpeg/nsJPEGEncoder.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is JPEG Encoding code
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Google Inc.
  19  * Portions created by the Initial Developer are Copyright (C) 2005
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Brett Wilson <brettw@gmail.com>
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "imgIEncoder.h"
  40
  41 // needed for JPEG library
  42 #include <stdio.h>
  43
  44 extern "C" {
  45 #include "jpeglib.h"
  46 }
  47
  48 #define NS_JPEGENCODER_CID \
  49 { /* ac2bb8fe-eeeb-4572-b40f-be03932b56e0 */         \
  50      0xac2bb8fe,                                     \
  51      0xeeeb,                                         \
  52      0x4572,                                         \
  53     {0xb4, 0x0f, 0xbe, 0x03, 0x93, 0x2b, 0x56, 0xe0} \
  54 }
  55
  56 // Provides JPEG encoding functionality. Use InitFromData() to do the
  57 // encoding. See that function definition for encoding options.
  58
  59 class nsJPEGEncoder : public imgIEncoder
  60 {
  61 public:
  62   NS_DECL_ISUPPORTS
  63   NS_DECL_IMGIENCODER
  64   NS_DECL_NSIINPUTSTREAM
  65
  66   nsJPEGEncoder();
  67
  68 private:
  69   ~nsJPEGEncoder();
  70
  71 protected:
  72
  73   void ConvertHostARGBRow(const PRUint8* aSrc, PRUint8* aDest,
  74                           PRUint32 aPixelWidth);
  75   void StripAlpha(const PRUint8* aSrc, PRUint8* aDest, PRUint32 aPixelWidth);
  76
  77   static void initDestination(jpeg_compress_struct* cinfo);
  78   static boolean emptyOutputBuffer(jpeg_compress_struct* cinfo);
  79   static void termDestination(jpeg_compress_struct* cinfo);
  80
  81   static void errorExit(jpeg_common_struct* cinfo);
  82
  83   // image buffer
  84   PRUint8* mImageBuffer;
  85   PRUint32 mImageBufferSize;
  86   PRUint32 mImageBufferUsed;
  87
  88   PRUint32 mImageBufferReadPoint;
  89 };