granicus.if.org Git - imagemagick/blob - MagickCore/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 1999-2012 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/cache-view.h"
  44 #include "MagickCore/exception.h"
  45 #include "MagickCore/exception-private.h"
  46 #include "MagickCore/hashmap.h"
  47 #include "MagickCore/image.h"
  48 #include "MagickCore/list.h"
  49 #include "MagickCore/memory_.h"
  50 #include "MagickCore/pixel-accessor.h"
  51 #include "MagickCore/prepress.h"
  52 #include "MagickCore/resource_.h"
  53 #include "MagickCore/registry.h"
  54 #include "MagickCore/semaphore.h"
  55 #include "MagickCore/splay-tree.h"
  56 #include "MagickCore/string_.h"
  57 #include "MagickCore/thread-private.h"
  58 \f
  59 /*
  60 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  61 %                                                                             %
  62 %                                                                             %
  63 %                                                                             %
  64 %   G e t I m a g e T o t a l I n k D e n s i t y                             %
  65 %                                                                             %
  66 %                                                                             %
  67 %                                                                             %
  68 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  69 %
  70 %  GetImageTotalInkDensity() returns the total ink density for a CMYK image.
  71 %  Total Ink Density (TID) is determined by adding the CMYK values in the
  72 %  darkest shadow area in an image.
  73 %
  74 %  The format of the GetImageTotalInkDensity method is:
  75 %
  76 %      double GetImageTotalInkDensity(const Image *image,
  77 %        ExceptionInfo *exception)
  78 %
  79 %  A description of each parameter follows:
  80 %
  81 %    o image: the image.
  82 %
  83 %    o exception: return any errors or warnings in this structure.
  84 %
  85 */
  86 MagickExport double GetImageTotalInkDensity(Image *image,
  87   ExceptionInfo *exception)
  88 {
  89   CacheView
  90     *image_view;
  91
  92   double
  93     total_ink_density;
  94
  95   MagickBooleanType
  96     status;
  97
  98   ssize_t
  99     y;
 100
 101   assert(image != (Image *) NULL);
 102   if (image->debug != MagickFalse)
 103     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 104   assert(image->signature == MagickSignature);
 105   if (image->colorspace != CMYKColorspace)
 106     {
 107       (void) ThrowMagickException(exception,GetMagickModule(),ImageError,
 108         "ColorSeparatedImageRequired","'%s'",image->filename);
 109       return(0.0);
 110     }
 111   status=MagickTrue;
 112   total_ink_density=0.0;
 113   image_view=AcquireVirtualCacheView(image,exception);
 114 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 115   #pragma omp parallel for schedule(static,4) shared(status) \
 116     dynamic_number_threads(image,image->columns,image->rows,1)
 117 #endif
 118   for (y=0; y < (ssize_t) image->rows; y++)
 119   {
 120     double
 121       density;
 122
 123     register const Quantum
 124       *p;
 125
 126     register ssize_t
 127       x;
 128
 129     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
 130     if (p == (const Quantum *) NULL)
 131       {
 132         status=MagickFalse;
 133         continue;
 134       }
 135     for (x=0; x < (ssize_t) image->columns; x++)
 136     {
 137       density=(double) GetPixelRed(image,p)+GetPixelGreen(image,p)+
 138         GetPixelBlue(image,p)+GetPixelBlack(image,p);
 139       if (density > total_ink_density)
 140 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 141         #pragma omp critical (MagickCore_GetImageTotalInkDensity)
 142 #endif
 143         {
 144           if (density > total_ink_density)
 145             total_ink_density=density;
 146         }
 147       p+=GetPixelChannels(image);
 148     }
 149   }
 150   image_view=DestroyCacheView(image_view);
 151   if (status == MagickFalse)
 152     total_ink_density=0.0;
 153   return(total_ink_density);
 154 }