granicus.if.org Git - imagemagick/blob - coders/matte.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                     M   M   AAA   TTTTT  TTTTT  EEEEE                       %
   7 %                     MM MM  A   A    T      T    E                           %
   8 %                     M M M  AAAAA    T      T    EEE                         %
   9 %                     M   M  A   A    T      T    E                           %
  10 %                     M   M  A   A    T      T    EEEEE                       %
  11 %                                                                             %
  12 %                                                                             %
  13 %                     Write Matte Channel To MIFF File.                       %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/cache.h"
  46 #include "MagickCore/constitute.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/image-private.h"
  50 #include "MagickCore/list.h"
  51 #include "MagickCore/magick.h"
  52 #include "MagickCore/memory_.h"
  53 #include "MagickCore/monitor.h"
  54 #include "MagickCore/monitor-private.h"
  55 #include "MagickCore/pixel-accessor.h"
  56 #include "MagickCore/quantum-private.h"
  57 #include "MagickCore/static.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/module.h"
  60 \f
  61 /*
  62   Forward declarations.
  63 */
  64 static MagickBooleanType
  65   WriteMATTEImage(const ImageInfo *,Image *,ExceptionInfo *);
  66 \f
  67 /*
  68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %   R e g i s t e r M A T T E I m a g e                                       %
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  77 %
  78 %  RegisterMATTEImage() adds attributes for the MATTE image format to
  79 %  the list of supported formats.  The attributes include the image format
  80 %  tag, a method to read and/or write the format, whether the format
  81 %  supports the saving of more than one frame to the same file or blob,
  82 %  whether the format supports native in-memory I/O, and a brief
  83 %  description of the format.
  84 %
  85 %  The format of the RegisterMATTEImage method is:
  86 %
  87 %      size_t RegisterMATTEImage(void)
  88 %
  89 */
  90 ModuleExport size_t RegisterMATTEImage(void)
  91 {
  92   MagickInfo
  93     *entry;
  94
  95   entry=SetMagickInfo("MATTE");
  96   entry->encoder=(EncodeImageHandler *) WriteMATTEImage;
  97   entry->format_type=ExplicitFormatType;
  98   entry->description=ConstantString("MATTE format");
  99   entry->module=ConstantString("MATTE");
 100   (void) RegisterMagickInfo(entry);
 101   return(MagickImageCoderSignature);
 102 }
 103 \f
 104 /*
 105 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 106 %                                                                             %
 107 %                                                                             %
 108 %                                                                             %
 109 %   U n r e g i s t e r M A T T E I m a g e                                   %
 110 %                                                                             %
 111 %                                                                             %
 112 %                                                                             %
 113 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 114 %
 115 %  UnregisterMATTEImage() removes format registrations made by the
 116 %  MATTE module from the list of supported formats.
 117 %
 118 %  The format of the UnregisterMATTEImage method is:
 119 %
 120 %      UnregisterMATTEImage(void)
 121 %
 122 */
 123 ModuleExport void UnregisterMATTEImage(void)
 124 {
 125   (void) UnregisterMagickInfo("MATTE");
 126 }
 127 \f
 128 /*
 129 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 130 %                                                                             %
 131 %                                                                             %
 132 %                                                                             %
 133 %   W r i t e M A T T E I m a g e                                             %
 134 %                                                                             %
 135 %                                                                             %
 136 %                                                                             %
 137 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 138 %
 139 %  WriteMATTEImage() writes an image of matte bytes to a file.  It consists of
 140 %  data from the matte component of the image [0..255].
 141 %
 142 %  The format of the WriteMATTEImage method is:
 143 %
 144 %      MagickBooleanType WriteMATTEImage(const ImageInfo *image_info,
 145 %        Image *image,ExceptionInfo *exception)
 146 %
 147 %  A description of each parameter follows.
 148 %
 149 %    o image_info: the image info.
 150 %
 151 %    o image:  The image.
 152 %
 153 %    o exception: return any errors or warnings in this structure.
 154 %
 155 */
 156 static MagickBooleanType WriteMATTEImage(const ImageInfo *image_info,
 157   Image *image,ExceptionInfo *exception)
 158 {
 159   Image
 160     *matte_image;
 161
 162   MagickBooleanType
 163     status;
 164
 165   register const Quantum
 166     *p;
 167
 168   register ssize_t
 169     x;
 170
 171   register Quantum
 172     *q;
 173
 174   ssize_t
 175     y;
 176
 177   if (image->matte == MagickFalse)
 178     ThrowWriterException(CoderError,"ImageDoesNotHaveAAlphaChannel");
 179   matte_image=CloneImage(image,image->columns,image->rows,MagickTrue,exception);
 180   if (matte_image == (Image *) NULL)
 181     return(MagickFalse);
 182   (void) SetImageType(matte_image,TrueColorMatteType,exception);
 183   matte_image->matte=MagickFalse;
 184   /*
 185     Convert image to matte pixels.
 186   */
 187   for (y=0; y < (ssize_t) image->rows; y++)
 188   {
 189     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 190     q=QueueAuthenticPixels(matte_image,0,y,matte_image->columns,1,exception);
 191     if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
 192       break;
 193     for (x=0; x < (ssize_t) image->columns; x++)
 194     {
 195       SetPixelRed(matte_image,GetPixelAlpha(image,p),q);
 196       SetPixelGreen(matte_image,GetPixelAlpha(image,p),q);
 197       SetPixelBlue(matte_image,GetPixelAlpha(image,p),q);
 198       SetPixelAlpha(matte_image,OpaqueAlpha,q);
 199       p+=GetPixelChannels(image);
 200       q+=GetPixelChannels(matte_image);
 201     }
 202     if (SyncAuthenticPixels(matte_image,exception) == MagickFalse)
 203       break;
 204     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 205       image->rows);
 206     if (status == MagickFalse)
 207       break;
 208   }
 209   (void) FormatLocaleString(matte_image->filename,MaxTextExtent,
 210     "MIFF:%s",image->filename);
 211   status=WriteImage(image_info,matte_image,exception);
 212   matte_image=DestroyImage(matte_image);
 213   return(status);
 214 }