granicus.if.org Git - imagemagick/blob - magick/prepress.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %           PPPP    RRRR    EEEEE  PPPP   RRRR   EEEEE  SSSSS  SSSSS          %
   7 %           P   P   R   R   E      P   P  R   R  E      SS     SS             %
   8 %           PPPP    RRRR    EEE    PPPP   RRRR   EEE     SSS    SSS           %
   9 %           P       R R     E      P      R R    E         SS     SS          %
  10 %           P       R  R    EEEEE  P      R  R   EEEEE  SSSSS  SSSSS          %
  11 %                                                                             %
  12 %                                                                             %
  13 %                         MagickCore Prepress Methods                         %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                October 2001                                 %
  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 "magick/studio.h"
  43 #include "magick/cache-view.h"
  44 #include "magick/exception.h"
  45 #include "magick/exception-private.h"
  46 #include "magick/hashmap.h"
  47 #include "magick/image.h"
  48 #include "magick/list.h"
  49 #include "magick/memory_.h"
  50 #include "magick/prepress.h"
  51 #include "magick/registry.h"
  52 #include "magick/semaphore.h"
  53 #include "magick/splay-tree.h"
  54 #include "magick/string_.h"
  55 \f
  56 /*
  57 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  58 %                                                                             %
  59 %                                                                             %
  60 %                                                                             %
  61 %   G e t I m a g e T o t a l I n k D e n s i t y                             %
  62 %                                                                             %
  63 %                                                                             %
  64 %                                                                             %
  65 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  66 %
  67 %  GetImageTotalInkDensity() returns the total ink density for a CMYK image.
  68 %  Total Ink Density (TID) is determined by adding the CMYK values in the
  69 %  darkest shadow area in an image.
  70 %
  71 %  The format of the GetImageTotalInkDensity method is:
  72 %
  73 %      double GetImageTotalInkDensity(const Image *image)
  74 %
  75 %  A description of each parameter follows:
  76 %
  77 %    o image: the image.
  78 %
  79 */
  80 MagickExport double GetImageTotalInkDensity(Image *image)
  81 {
  82   CacheView
  83     *image_view;
  84
  85   double
  86     total_ink_density;
  87
  88   ExceptionInfo
  89     *exception;
  90
  91   ssize_t
  92     y;
  93
  94   MagickBooleanType
  95     status;
  96
  97   assert(image != (Image *) NULL);
  98   if (image->debug != MagickFalse)
  99     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 100   assert(image->signature == MagickSignature);
 101   if (image->colorspace != CMYKColorspace)
 102     {
 103       (void) ThrowMagickException(&image->exception,GetMagickModule(),
 104         ImageError,"ColorSeparatedImageRequired","`%s'",image->filename);
 105       return(0.0);
 106     }
 107   status=MagickTrue;
 108   total_ink_density=0.0;
 109   exception=(&image->exception);
 110   image_view=AcquireCacheView(image);
 111 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 112   #pragma omp parallel for schedule(dynamic,4) shared(status)
 113 #endif
 114   for (y=0; y < (ssize_t) image->rows; y++)
 115   {
 116     double
 117       density;
 118
 119     register const IndexPacket
 120       *indexes;
 121
 122     register const PixelPacket
 123       *p;
 124
 125     register ssize_t
 126       x;
 127
 128     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
 129     if (p == (const PixelPacket *) NULL)
 130       {
 131         status=MagickFalse;
 132         continue;
 133       }
 134     indexes=GetCacheViewVirtualIndexQueue(image_view);
 135     for (x=0; x < (ssize_t) image->columns; x++)
 136     {
 137       density=(double) p->red+p->green+p->blue+indexes[x];
 138       if (density > total_ink_density)
 139 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 140   #pragma omp critical (MagickCore_GetImageTotalInkDensity)
 141 #endif
 142         {
 143           if (density > total_ink_density)
 144             total_ink_density=density;
 145         }
 146       p++;
 147     }
 148   }
 149   image_view=DestroyCacheView(image_view);
 150   if (status == MagickFalse)
 151     total_ink_density=0.0;
 152   return(total_ink_density);
 153 }