LCOV - code coverage report
Current view: directory - image/decoders - nsIconDecoder.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 46 0 0.0 %
Date: 2012-06-02 Functions: 4 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is mozilla.org code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   Scott MacGregor <mscott@netscape.com>
      25                 :  *   Bobby Holley <bobbyholley@gmail.com>
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      29                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : #include "nsIconDecoder.h"
      42                 : #include "nsIInputStream.h"
      43                 : #include "RasterImage.h"
      44                 : #include "imgIContainerObserver.h"
      45                 : #include "nspr.h"
      46                 : #include "nsRect.h"
      47                 : 
      48                 : #include "ImageErrors.h"
      49                 : 
      50                 : namespace mozilla {
      51                 : namespace image {
      52                 : 
      53               0 : nsIconDecoder::nsIconDecoder(RasterImage &aImage, imgIDecoderObserver* aObserver)
      54                 :  : Decoder(aImage, aObserver),
      55                 :    mWidth(-1),
      56                 :    mHeight(-1),
      57                 :    mPixBytesRead(0),
      58                 :    mPixBytesTotal(0),
      59                 :    mImageData(nsnull),
      60               0 :    mState(iconStateStart)
      61                 : {
      62                 :   // Nothing to do
      63               0 : }
      64                 : 
      65               0 : nsIconDecoder::~nsIconDecoder()
      66               0 : { }
      67                 : 
      68                 : void
      69               0 : nsIconDecoder::WriteInternal(const char *aBuffer, PRUint32 aCount)
      70                 : {
      71               0 :   NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
      72                 : 
      73                 :   // We put this here to avoid errors about crossing initialization with case
      74                 :   // jumps on linux.
      75               0 :   PRUint32 bytesToRead = 0;
      76                 :   nsresult rv;
      77                 : 
      78                 :   // Performance isn't critical here, so our update rectangle is 
      79                 :   // always the full icon
      80               0 :   nsIntRect r(0, 0, mWidth, mHeight);
      81                 : 
      82                 :   // Loop until the input data is gone
      83               0 :   while (aCount > 0) {
      84               0 :     switch (mState) {
      85                 :       case iconStateStart:
      86                 : 
      87                 :         // Grab the width
      88               0 :         mWidth = (PRUint8)*aBuffer;
      89                 : 
      90                 :         // Book Keeping
      91               0 :         aBuffer++;
      92               0 :         aCount--;
      93               0 :         mState = iconStateHaveHeight;
      94               0 :         break;
      95                 : 
      96                 :       case iconStateHaveHeight:
      97                 : 
      98                 :         // Grab the Height
      99               0 :         mHeight = (PRUint8)*aBuffer;
     100                 : 
     101                 :         // Post our size to the superclass
     102               0 :         PostSize(mWidth, mHeight);
     103               0 :         if (HasError()) {
     104                 :           // Setting the size lead to an error; this can happen when for example
     105                 :           // a multipart channel sends an image of a different size.
     106               0 :           mState = iconStateFinished;
     107               0 :           return;
     108                 :         }
     109                 : 
     110                 :         // If We're doing a size decode, we're done
     111               0 :         if (IsSizeDecode()) {
     112               0 :           mState = iconStateFinished;
     113               0 :           break;
     114                 :         }
     115                 : 
     116                 :         // Add the frame and signal
     117                 :         rv = mImage.EnsureFrame(0, 0, 0, mWidth, mHeight,
     118                 :                                 gfxASurface::ImageFormatARGB32,
     119               0 :                                 &mImageData, &mPixBytesTotal);
     120               0 :         if (NS_FAILED(rv)) {
     121               0 :           PostDecoderError(rv);
     122               0 :           return;
     123                 :         }
     124                 : 
     125                 :         // Tell the superclass we're starting a frame
     126               0 :         PostFrameStart();
     127                 : 
     128                 :         // Book Keeping
     129               0 :         aBuffer++;
     130               0 :         aCount--;
     131               0 :         mState = iconStateReadPixels;
     132               0 :         break;
     133                 : 
     134                 :       case iconStateReadPixels:
     135                 : 
     136                 :         // How many bytes are we reading?
     137               0 :         bytesToRead = NS_MIN(aCount, mPixBytesTotal - mPixBytesRead);
     138                 : 
     139                 :         // Copy the bytes
     140               0 :         memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
     141                 : 
     142                 :         // Invalidate
     143               0 :         PostInvalidation(r);
     144                 : 
     145                 :         // Book Keeping
     146               0 :         aBuffer += bytesToRead;
     147               0 :         aCount -= bytesToRead;
     148               0 :         mPixBytesRead += bytesToRead;
     149                 : 
     150                 :         // If we've got all the pixel bytes, we're finished
     151               0 :         if (mPixBytesRead == mPixBytesTotal) {
     152               0 :           PostFrameStop();
     153               0 :           PostDecodeDone();
     154               0 :           mState = iconStateFinished;
     155                 :         }
     156               0 :         break;
     157                 : 
     158                 :       case iconStateFinished:
     159                 : 
     160                 :         // Consume all excess data silently
     161               0 :         aCount = 0;
     162                 : 
     163               0 :         break;
     164                 :     }
     165                 :   }
     166                 : }
     167                 : 
     168                 : } // namespace image
     169                 : } // namespace mozilla

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