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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %               CCCC   AAA   PPPP   TTTTT  IIIII   OOO   N   N                %
   7 %              C      A   A  P   P    T      I    O   O  NN  N                %
   8 %              C      AAAAA  PPPP     T      I    O   O  N N N                %
   9 %              C      A   A  P        T      I    O   O  N  NN                %
  10 %               CCCC  A   A  P        T    IIIII   OOO   N   N                %
  11 %                                                                             %
  12 %                                                                             %
  13 %                             Read Text Caption.                              %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                               February 2002                                 %
  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/annotate.h"
  44 #include "magick/blob.h"
  45 #include "magick/blob-private.h"
  46 #include "magick/draw.h"
  47 #include "magick/exception.h"
  48 #include "magick/exception-private.h"
  49 #include "magick/image.h"
  50 #include "magick/image-private.h"
  51 #include "magick/list.h"
  52 #include "magick/magick.h"
  53 #include "magick/memory_.h"
  54 #include "magick/option.h"
  55 #include "magick/property.h"
  56 #include "magick/quantum-private.h"
  57 #include "magick/static.h"
  58 #include "magick/string_.h"
  59 #include "magick/module.h"
  60 \f
  61 /*
  62 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  63 %                                                                             %
  64 %                                                                             %
  65 %                                                                             %
  66 %   R e a d C A P T I O N I m a g e                                           %
  67 %                                                                             %
  68 %                                                                             %
  69 %                                                                             %
  70 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  71 %
  72 %  ReadCAPTIONImage() reads a CAPTION image file and returns it.  It
  73 %  allocates the memory necessary for the new Image structure and returns a
  74 %  pointer to the new image.
  75 %
  76 %  The format of the ReadCAPTIONImage method is:
  77 %
  78 %      Image *ReadCAPTIONImage(const ImageInfo *image_info,
  79 %        ExceptionInfo *exception)
  80 %
  81 %  A description of each parameter follows:
  82 %
  83 %    o image_info: the image info.
  84 %
  85 %    o exception: return any errors or warnings in this structure.
  86 %
  87 */
  88 static Image *ReadCAPTIONImage(const ImageInfo *image_info,
  89   ExceptionInfo *exception)
  90 {
  91   char
  92     *caption,
  93     geometry[MaxTextExtent],
  94     *property;
  95
  96   const char
  97     *gravity;
  98
  99   DrawInfo
 100     *draw_info;
 101
 102   Image
 103     *image;
 104
 105   MagickBooleanType
 106     status;
 107
 108   register ssize_t
 109     i;
 110
 111   TypeMetric
 112     metrics;
 113
 114   size_t
 115     height,
 116     width;
 117
 118   /*
 119     Initialize Image structure.
 120   */
 121   assert(image_info != (const ImageInfo *) NULL);
 122   assert(image_info->signature == MagickSignature);
 123   if (image_info->debug != MagickFalse)
 124     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 125       image_info->filename);
 126   assert(exception != (ExceptionInfo *) NULL);
 127   assert(exception->signature == MagickSignature);
 128   image=AcquireImage(image_info);
 129   if (image->columns == 0)
 130     ThrowReaderException(OptionError,"MustSpecifyImageSize");
 131   (void) ResetImagePage(image,"0x0+0+0");
 132   /*
 133     Format caption.
 134   */
 135   property=InterpretImageProperties(image_info,image,image_info->filename);
 136   (void) SetImageProperty(image,"caption",property);
 137   property=DestroyString(property);
 138   caption=ConstantString(GetImageProperty(image,"caption"));
 139   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
 140   draw_info->text=ConstantString(caption);
 141   gravity=GetImageOption(image_info,"gravity");
 142   if (gravity != (char *) NULL)
 143     draw_info->gravity=(GravityType) ParseMagickOption(MagickGravityOptions,
 144       MagickFalse,gravity);
 145   if ((*caption != '\0') && (image->rows != 0) &&
 146       (image_info->pointsize == 0.0))
 147     {
 148       char
 149         *text;
 150
 151       /*
 152         Scale text to fit bounding box.
 153       */
 154       for ( ; ; )
 155       {
 156         text=AcquireString(caption);
 157         i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text);
 158         (void) CloneString(&draw_info->text,text);
 159         text=DestroyString(text);
 160         (void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
 161           -metrics.bounds.x1,metrics.ascent);
 162         if (draw_info->gravity == UndefinedGravity)
 163           (void) CloneString(&draw_info->geometry,geometry);
 164         status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 165         (void) status;
 166         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 167         height=(size_t) floor(metrics.height+draw_info->stroke_width+
 168           0.5);
 169         if ((width > (image->columns+1)) || (height > (image->rows+1)))
 170           break;
 171         draw_info->pointsize*=2.0;
 172       }
 173       draw_info->pointsize/=2.0;
 174       for ( ; ; )
 175       {
 176         text=AcquireString(caption);
 177         i=FormatMagickCaption(image,draw_info,MagickFalse,&metrics,&text);
 178         (void) CloneString(&draw_info->text,text);
 179         text=DestroyString(text);
 180         (void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
 181           -metrics.bounds.x1,metrics.ascent);
 182         if (draw_info->gravity == UndefinedGravity)
 183           (void) CloneString(&draw_info->geometry,geometry);
 184         status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 185         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 186         height=(size_t) floor(metrics.height+draw_info->stroke_width+
 187           0.5);
 188         if ((width > (image->columns+1)) || (height > (image->rows+1)))
 189           break;
 190         draw_info->pointsize++;
 191       }
 192       draw_info->pointsize--;
 193     }
 194   i=FormatMagickCaption(image,draw_info,MagickTrue,&metrics,&caption);
 195   if (image->rows == 0)
 196     image->rows=(size_t) ((i+1)*(metrics.ascent-metrics.descent+
 197       draw_info->stroke_width)+0.5);
 198   if (image->rows == 0)
 199     image->rows=(size_t) ((i+1)*draw_info->pointsize+
 200       draw_info->stroke_width+0.5);
 201   if (SetImageBackgroundColor(image) == MagickFalse)
 202     {
 203       InheritException(exception,&image->exception);
 204       image=DestroyImageList(image);
 205       return((Image *) NULL);
 206     }
 207   /*
 208     Draw caption.
 209   */
 210   (void) CloneString(&draw_info->text,caption);
 211   status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 212   if (draw_info->gravity != UndefinedGravity)
 213     image->page.x=(ssize_t) (metrics.bounds.x1-draw_info->stroke_width/2.0);
 214   else
 215     {
 216       (void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
 217         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
 218         draw_info->stroke_width/2.0);
 219       (void) CloneString(&draw_info->geometry,geometry);
 220     }
 221   (void) AnnotateImage(image,draw_info);
 222   draw_info=DestroyDrawInfo(draw_info);
 223   caption=DestroyString(caption);
 224   return(GetFirstImageInList(image));
 225 }
 226 \f
 227 /*
 228 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 229 %                                                                             %
 230 %                                                                             %
 231 %                                                                             %
 232 %   R e g i s t e r C A P T I O N I m a g e                                   %
 233 %                                                                             %
 234 %                                                                             %
 235 %                                                                             %
 236 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 237 %
 238 %  RegisterCAPTIONImage() adds attributes for the CAPTION image format to
 239 %  the list of supported formats.  The attributes include the image format
 240 %  tag, a method to read and/or write the format, whether the format
 241 %  supports the saving of more than one frame to the same file or blob,
 242 %  whether the format supports native in-memory I/O, and a brief
 243 %  description of the format.
 244 %
 245 %  The format of the RegisterCAPTIONImage method is:
 246 %
 247 %      size_t RegisterCAPTIONImage(void)
 248 %
 249 */
 250 ModuleExport size_t RegisterCAPTIONImage(void)
 251 {
 252   MagickInfo
 253     *entry;
 254
 255   entry=SetMagickInfo("CAPTION");
 256   entry->decoder=(DecodeImageHandler *) ReadCAPTIONImage;
 257   entry->adjoin=MagickFalse;
 258   entry->format_type=ImplicitFormatType;
 259   entry->description=ConstantString("Image caption");
 260   entry->module=ConstantString("CAPTION");
 261   (void) RegisterMagickInfo(entry);
 262   return(MagickImageCoderSignature);
 263 }
 264 \f
 265 /*
 266 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 267 %                                                                             %
 268 %                                                                             %
 269 %                                                                             %
 270 %   U n r e g i s t e r C A P T I O N I m a g e                               %
 271 %                                                                             %
 272 %                                                                             %
 273 %                                                                             %
 274 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 275 %
 276 %  UnregisterCAPTIONImage() removes format registrations made by the
 277 %  CAPTION module from the list of supported formats.
 278 %
 279 %  The format of the UnregisterCAPTIONImage method is:
 280 %
 281 %      UnregisterCAPTIONImage(void)
 282 %
 283 */
 284 ModuleExport void UnregisterCAPTIONImage(void)
 285 {
 286   (void) UnregisterMagickInfo("CAPTION");
 287 }