LCOV - code coverage report
Current view: directory - image/encoders/bmp - nsBMPEncoder.h (source / functions) Found Hit Coverage
Test: app.info Lines: 2 0 0.0 %
Date: 2012-06-02 Functions: 1 0 0.0 %

       1                 : /* ***** BEGIN LICENSE BLOCK *****
       2                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       3                 :  *
       4                 :  * The contents of this file are subject to the Mozilla Public License Version
       5                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       6                 :  * the License. You may obtain a copy of the License at
       7                 :  * http://www.mozilla.org/MPL/
       8                 :  *
       9                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      10                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      11                 :  * for the specific language governing rights and limitations under the
      12                 :  * License.
      13                 :  *
      14                 :  * The Original Code is an implementation of a bitmap encoder.
      15                 :  *
      16                 :  * The Initial Developer of the Original Code is
      17                 :  * Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2011
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Brian R. Bondy <netzen@gmail.com>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include "mozilla/Attributes.h"
      39                 : #include "mozilla/ReentrantMonitor.h"
      40                 : 
      41                 : #include "imgIEncoder.h"
      42                 : #include "BMPFileHeaders.h"
      43                 : 
      44                 : #include "nsCOMPtr.h"
      45                 : 
      46                 : #define NS_BMPENCODER_CID \
      47                 : { /* 13a5320c-4c91-4FA4-bd16-b081a3ba8c0b */         \
      48                 :      0x13a5320c,                                     \
      49                 :      0x4c91,                                         \
      50                 :      0x4fa4,                                         \
      51                 :     {0xbd, 0x16, 0xb0, 0x81, 0xa3, 0Xba, 0x8c, 0x0b} \
      52                 : }
      53                 : 
      54                 : // Provides BMP encoding functionality. Use InitFromData() to do the
      55                 : // encoding. See that function definition for encoding options.
      56                 : 
      57                 : class nsBMPEncoder MOZ_FINAL : public imgIEncoder
      58                 : {
      59                 :   typedef mozilla::ReentrantMonitor ReentrantMonitor;
      60                 : public:
      61                 :   NS_DECL_ISUPPORTS
      62                 :   NS_DECL_IMGIENCODER
      63                 :   NS_DECL_NSIINPUTSTREAM
      64                 :   NS_DECL_NSIASYNCINPUTSTREAM
      65                 : 
      66                 :   nsBMPEncoder();
      67                 :   ~nsBMPEncoder();
      68                 : 
      69                 : protected:
      70                 :   // See InitData in the cpp for valid parse options
      71                 :   nsresult ParseOptions(const nsAString& aOptions, PRUint32* bpp);
      72                 :   // Obtains data with no alpha in machine-independent byte order
      73                 :   void ConvertHostARGBRow(const PRUint8* aSrc, PRUint8* aDest,
      74                 :                           PRUint32 aPixelWidth);
      75                 :   // Strips the alpha from aSrc and puts it in aDest
      76                 :   void StripAlpha(const PRUint8* aSrc, PRUint8* aDest,
      77                 :                   PRUint32 aPixelWidth);
      78                 :   // Thread safe notify listener
      79                 :   void NotifyListener();
      80                 : 
      81                 :   // Initializes the bitmap file header member mBMPFileHeader
      82                 :   void InitFileHeader(PRUint32 aBPP, PRUint32 aWidth, PRUint32 aHeight);
      83                 :   // Initializes the bitmap info header member mBMPInfoHeader
      84                 :   void InitInfoHeader(PRUint32 aBPP, PRUint32 aWidth, PRUint32 aHeight);
      85                 :   // Encodes the bitmap file header member mBMPFileHeader
      86                 :   void EncodeFileHeader();
      87                 :   // Encodes the bitmap info header member mBMPInfoHeader
      88                 :   void EncodeInfoHeader();
      89                 :   // Encodes a row of image data which does not have alpha data
      90                 :   void EncodeImageDataRow24(const PRUint8* aData);
      91                 :   // Encodes a row of image data which does have alpha data
      92                 :   void EncodeImageDataRow32(const PRUint8* aData);
      93                 :   // Obtains the current offset filled up to for the image buffer
      94               0 :   inline PRInt32 GetCurrentImageBufferOffset()
      95                 :   {
      96               0 :     return static_cast<PRInt32>(mImageBufferCurr - mImageBufferStart);
      97                 :   }
      98                 : 
      99                 :   // These headers will always contain endian independent stuff 
     100                 :   // They store the BMP headers which will be encoded
     101                 :   mozilla::image::BMPFILEHEADER mBMPFileHeader;
     102                 :   mozilla::image::BMPINFOHEADER mBMPInfoHeader;
     103                 : 
     104                 :   // Keeps track of the start of the image buffer
     105                 :   PRUint8* mImageBufferStart;
     106                 :   // Keeps track of the current position in the image buffer
     107                 :   PRUint8* mImageBufferCurr;
     108                 :   // Keeps track of the image buffer size
     109                 :   PRUint32 mImageBufferSize;
     110                 :   // Keeps track of the number of bytes in the image buffer which are read
     111                 :   PRUint32 mImageBufferReadPoint;
     112                 :   // Stores true if the image is done being encoded
     113                 :   bool mFinished;
     114                 : 
     115                 :   nsCOMPtr<nsIInputStreamCallback> mCallback;
     116                 :   nsCOMPtr<nsIEventTarget> mCallbackTarget;
     117                 :   PRUint32 mNotifyThreshold;
     118                 : };

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