LCOV - code coverage report
Current view: directory - widget/gtk2 - nsImageToPixbuf.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 63 0 0.0 %
Date: 2012-06-02 Functions: 8 0 0.0 %

       1                 : /* vim:set sw=4 sts=4 et cin: */
       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 mozilla.org widget code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Christian Biesinger <cbiesinger@web.de>.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2006
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      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 <gdk-pixbuf/gdk-pixbuf.h>
      39                 : 
      40                 : #include "gfxASurface.h"
      41                 : #include "gfxImageSurface.h"
      42                 : #include "gfxContext.h"
      43                 : 
      44                 : #include "imgIContainer.h"
      45                 : 
      46                 : #include "nsAutoPtr.h"
      47                 : 
      48                 : #include "nsImageToPixbuf.h"
      49                 : 
      50               0 : NS_IMPL_ISUPPORTS1(nsImageToPixbuf, nsIImageToPixbuf)
      51                 : 
      52                 : inline unsigned char
      53               0 : unpremultiply (unsigned char color,
      54                 :                unsigned char alpha)
      55                 : {
      56               0 :     if (alpha == 0)
      57               0 :         return 0;
      58                 :     // plus alpha/2 to round instead of truncate
      59               0 :     return (color * 255 + alpha / 2) / alpha;
      60                 : }
      61                 : 
      62                 : NS_IMETHODIMP_(GdkPixbuf*)
      63               0 : nsImageToPixbuf::ConvertImageToPixbuf(imgIContainer* aImage)
      64                 : {
      65               0 :     return ImageToPixbuf(aImage);
      66                 : }
      67                 : 
      68                 : GdkPixbuf*
      69               0 : nsImageToPixbuf::ImageToPixbuf(imgIContainer* aImage)
      70                 : {
      71               0 :     nsRefPtr<gfxImageSurface> frame;
      72                 :     nsresult rv = aImage->CopyFrame(imgIContainer::FRAME_CURRENT,
      73                 :                                     imgIContainer::FLAG_SYNC_DECODE,
      74               0 :                                     getter_AddRefs(frame));
      75                 : 
      76                 :     // If the last call failed, it was probably because our call stack originates
      77                 :     // in an imgIDecoderObserver event, meaning that we're not allowed request
      78                 :     // a sync decode. Presumably the originating event is something sensible like
      79                 :     // OnStopFrame(), so we can just retry the call without a sync decode.
      80               0 :     if (NS_FAILED(rv))
      81                 :         aImage->CopyFrame(imgIContainer::FRAME_CURRENT,
      82                 :                           imgIContainer::FLAG_NONE,
      83               0 :                           getter_AddRefs(frame));
      84                 : 
      85               0 :     if (!frame)
      86               0 :       return nsnull;
      87                 : 
      88               0 :     return ImgSurfaceToPixbuf(frame, frame->Width(), frame->Height());
      89                 : }
      90                 : 
      91                 : GdkPixbuf*
      92               0 : nsImageToPixbuf::ImgSurfaceToPixbuf(gfxImageSurface* aImgSurface, PRInt32 aWidth, PRInt32 aHeight)
      93                 : {
      94                 :     GdkPixbuf* pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8,
      95               0 :                                        aWidth, aHeight);
      96               0 :     if (!pixbuf)
      97               0 :         return nsnull;
      98                 : 
      99               0 :     PRUint32 rowstride = gdk_pixbuf_get_rowstride (pixbuf);
     100               0 :     guchar* pixels = gdk_pixbuf_get_pixels (pixbuf);
     101                 : 
     102               0 :     long cairoStride = aImgSurface->Stride();
     103               0 :     unsigned char* cairoData = aImgSurface->Data();
     104                 : 
     105               0 :     gfxASurface::gfxImageFormat format = aImgSurface->Format();
     106                 : 
     107               0 :     for (PRInt32 row = 0; row < aHeight; ++row) {
     108               0 :         for (PRInt32 col = 0; col < aWidth; ++col) {
     109               0 :             guchar* pixel = pixels + row * rowstride + 4 * col;
     110                 : 
     111                 :             PRUint32* cairoPixel = reinterpret_cast<PRUint32*>
     112               0 :                                                    ((cairoData + row * cairoStride + 4 * col));
     113                 : 
     114               0 :             if (format == gfxASurface::ImageFormatARGB32) {
     115               0 :                 const PRUint8 a = (*cairoPixel >> 24) & 0xFF;
     116               0 :                 const PRUint8 r = unpremultiply((*cairoPixel >> 16) & 0xFF, a);
     117               0 :                 const PRUint8 g = unpremultiply((*cairoPixel >>  8) & 0xFF, a);
     118               0 :                 const PRUint8 b = unpremultiply((*cairoPixel >>  0) & 0xFF, a);
     119                 : 
     120               0 :                 *pixel++ = r;
     121               0 :                 *pixel++ = g;
     122               0 :                 *pixel++ = b;
     123               0 :                 *pixel++ = a;
     124                 :             } else {
     125               0 :                 NS_ASSERTION(format == gfxASurface::ImageFormatRGB24,
     126                 :                              "unexpected format");
     127               0 :                 const PRUint8 r = (*cairoPixel >> 16) & 0xFF;
     128               0 :                 const PRUint8 g = (*cairoPixel >>  8) & 0xFF;
     129               0 :                 const PRUint8 b = (*cairoPixel >>  0) & 0xFF;
     130                 : 
     131               0 :                 *pixel++ = r;
     132               0 :                 *pixel++ = g;
     133               0 :                 *pixel++ = b;
     134               0 :                 *pixel++ = 0xFF; // A
     135                 :             }
     136                 :         }
     137                 :     }
     138                 : 
     139               0 :     return pixbuf;
     140                 : }
     141                 : 
     142                 : GdkPixbuf*
     143               0 : nsImageToPixbuf::SurfaceToPixbuf(gfxASurface* aSurface, PRInt32 aWidth, PRInt32 aHeight)
     144                 : {
     145               0 :     if (aSurface->CairoStatus()) {
     146               0 :         NS_ERROR("invalid surface");
     147               0 :         return nsnull;
     148                 :     }
     149                 : 
     150               0 :     nsRefPtr<gfxImageSurface> imgSurface;
     151               0 :     if (aSurface->GetType() == gfxASurface::SurfaceTypeImage) {
     152                 :         imgSurface = static_cast<gfxImageSurface*>
     153               0 :                                 (static_cast<gfxASurface*>(aSurface));
     154                 :     } else {
     155                 :         imgSurface = new gfxImageSurface(gfxIntSize(aWidth, aHeight),
     156               0 :                                          gfxImageSurface::ImageFormatARGB32);
     157                 :                                        
     158               0 :         if (!imgSurface)
     159               0 :             return nsnull;
     160                 : 
     161               0 :         nsRefPtr<gfxContext> context = new gfxContext(imgSurface);
     162               0 :         if (!context)
     163               0 :             return nsnull;
     164                 : 
     165               0 :         context->SetOperator(gfxContext::OPERATOR_SOURCE);
     166               0 :         context->SetSource(aSurface);
     167               0 :         context->Paint();
     168                 :     }
     169                 : 
     170               0 :     return ImgSurfaceToPixbuf(imgSurface, aWidth, aHeight);
     171                 : }

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