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 %                                   Cristy                                    %
17 %                                October 2001                                 %
18 %                                                                             %
19 %                                                                             %
20 %  Copyright 1999-2016 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 
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/image.h"
47 #include "MagickCore/linked-list.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 
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 == MagickCoreSignature);
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     magick_threads(image,image,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 }
155