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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                     L       AAA   BBBB   EEEEE  L                           %
   7 %                     L      A   A  B   B  E      L                           %
   8 %                     L      AAAAA  BBBB   EEE    L                           %
   9 %                     L      A   A  B   B  E      L                           %
  10 %                     LLLLL  A   A  BBBB   EEEEE  LLLLL                       %
  11 %                                                                             %
  12 %                                                                             %
  13 %                      Read ASCII String As An Image.                         %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2013 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/annotate.h"
  44 #include "MagickCore/artifact.h"
  45 #include "MagickCore/blob.h"
  46 #include "MagickCore/blob-private.h"
  47 #include "MagickCore/draw.h"
  48 #include "MagickCore/exception.h"
  49 #include "MagickCore/exception-private.h"
  50 #include "MagickCore/image.h"
  51 #include "MagickCore/image-private.h"
  52 #include "MagickCore/list.h"
  53 #include "MagickCore/magick.h"
  54 #include "MagickCore/memory_.h"
  55 #include "MagickCore/property.h"
  56 #include "MagickCore/quantum-private.h"
  57 #include "MagickCore/static.h"
  58 #include "MagickCore/string_.h"
  59 #include "MagickCore/module.h"
  60 #include "MagickCore/utility.h"
  61 \f
  62 /*
  63 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  64 %                                                                             %
  65 %                                                                             %
  66 %                                                                             %
  67 %   R e a d L A B E L I m a g e                                               %
  68 %                                                                             %
  69 %                                                                             %
  70 %                                                                             %
  71 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72 %
  73 %  ReadLABELImage() reads a LABEL image file and returns it.  It
  74 %  allocates the memory necessary for the new Image structure and returns a
  75 %  pointer to the new image.
  76 %
  77 %  The format of the ReadLABELImage method is:
  78 %
  79 %      Image *ReadLABELImage(const ImageInfo *image_info,
  80 %        ExceptionInfo *exception)
  81 %
  82 %  A description of each parameter follows:
  83 %
  84 %    o image_info: the image info.
  85 %
  86 %    o exception: return any errors or warnings in this structure.
  87 %
  88 */
  89 static Image *ReadLABELImage(const ImageInfo *image_info,
  90   ExceptionInfo *exception)
  91 {
  92   char
  93     geometry[MaxTextExtent],
  94     *property;
  95
  96   const char
  97     *label;
  98
  99   DrawInfo
 100     *draw_info;
 101
 102   Image
 103     *image;
 104
 105   MagickBooleanType
 106     status;
 107
 108   TypeMetric
 109     metrics;
 110
 111   size_t
 112     height,
 113     width;
 114
 115   /*
 116     Initialize Image structure.
 117   */
 118   assert(image_info != (const ImageInfo *) NULL);
 119   assert(image_info->signature == MagickSignature);
 120   if (image_info->debug != MagickFalse)
 121     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 122       image_info->filename);
 123   assert(exception != (ExceptionInfo *) NULL);
 124   assert(exception->signature == MagickSignature);
 125   image=AcquireImage(image_info,exception);
 126   (void) ResetImagePage(image,"0x0+0+0");
 127   property=InterpretImageProperties(image_info,image,image_info->filename,
 128     exception);
 129   (void) SetImageProperty(image,"label",property,exception);
 130   property=DestroyString(property);
 131   label=GetImageProperty(image,"label",exception);
 132   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
 133   draw_info->text=ConstantString(label);
 134   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 135   if (image->columns == 0)
 136     {
 137       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 138         -metrics.bounds.x1,metrics.ascent);
 139       if (draw_info->gravity == UndefinedGravity)
 140         (void) CloneString(&draw_info->geometry,geometry);
 141       status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 142       (void) status;
 143       image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 144     }
 145   if (image->rows == 0)
 146     {
 147       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 148         -metrics.bounds.x1,metrics.ascent);
 149       if (draw_info->gravity == UndefinedGravity)
 150         (void) CloneString(&draw_info->geometry,geometry);
 151       status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 152       image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 153     }
 154   if (image_info->pointsize == 0.0)
 155     {
 156       double
 157         high,
 158         low;
 159
 160       /*
 161         Auto fit text into bounding box.
 162       */
 163       for ( ; ; draw_info->pointsize*=2.0)
 164       {
 165         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 166           -metrics.bounds.x1,metrics.ascent);
 167         if (draw_info->gravity == UndefinedGravity)
 168           (void) CloneString(&draw_info->geometry,geometry);
 169         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 170         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 171         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 172         if ((width >= image->columns) && (height >= image->rows))
 173           break;
 174         if ((width >= (image->columns << 1)) || (height >= (image->rows << 1)))
 175           break;
 176       }
 177       high=draw_info->pointsize/2.0;
 178       for (low=high/2.0; (high-low) > 1.0; )
 179       {
 180         draw_info->pointsize=(low+high)/2.0;
 181         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 182           -metrics.bounds.x1,metrics.ascent);
 183         if (draw_info->gravity == UndefinedGravity)
 184           (void) CloneString(&draw_info->geometry,geometry);
 185         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 186         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 187         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 188         if ((width <= image->columns) && (height <= image->rows))
 189           low=draw_info->pointsize+1.0;
 190         else
 191           high=draw_info->pointsize-1.0;
 192       }
 193       for (draw_info->pointsize=(low+high)/2.0; (high-low) > 1.0; )
 194       {
 195         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 196           -metrics.bounds.x1,metrics.ascent);
 197         if (draw_info->gravity == UndefinedGravity)
 198           (void) CloneString(&draw_info->geometry,geometry);
 199         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 200         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 201         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 202         if ((width <= image->columns) && (height <= image->rows))
 203           break;
 204         draw_info->pointsize--;
 205       }
 206       draw_info->pointsize--;
 207     }
 208   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 209   if (status == MagickFalse)
 210     {
 211       image=DestroyImageList(image);
 212       return((Image *) NULL);
 213     }
 214   if (draw_info->gravity == UndefinedGravity)
 215     {
 216       (void) FormatLocaleString(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   if (draw_info->direction == RightToLeftDirection)
 222     {
 223       if (draw_info->direction == RightToLeftDirection)
 224         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 225           image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
 226           metrics.ascent+draw_info->stroke_width/2.0);
 227       (void) CloneString(&draw_info->geometry,geometry);
 228     }
 229   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 230     {
 231       image=DestroyImageList(image);
 232       return((Image *) NULL);
 233     }
 234   (void) AnnotateImage(image,draw_info,exception);
 235   if (image_info->pointsize == 0.0)
 236     {
 237       char
 238         pointsize[MaxTextExtent];
 239
 240       (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
 241         draw_info->pointsize);
 242       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 243     }
 244   draw_info=DestroyDrawInfo(draw_info);
 245   return(GetFirstImageInList(image));
 246 }
 247 \f
 248 /*
 249 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 250 %                                                                             %
 251 %                                                                             %
 252 %                                                                             %
 253 %   R e g i s t e r L A B E L I m a g e                                       %
 254 %                                                                             %
 255 %                                                                             %
 256 %                                                                             %
 257 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 258 %
 259 %  RegisterLABELImage() adds properties for the LABEL image format to
 260 %  the list of supported formats.  The properties include the image format
 261 %  tag, a method to read and/or write the format, whether the format
 262 %  supports the saving of more than one frame to the same file or blob,
 263 %  whether the format supports native in-memory I/O, and a brief
 264 %  description of the format.
 265 %
 266 %  The format of the RegisterLABELImage method is:
 267 %
 268 %      size_t RegisterLABELImage(void)
 269 %
 270 */
 271 ModuleExport size_t RegisterLABELImage(void)
 272 {
 273   MagickInfo
 274     *entry;
 275
 276   entry=SetMagickInfo("LABEL");
 277   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 278   entry->adjoin=MagickFalse;
 279   entry->format_type=ImplicitFormatType;
 280   entry->description=ConstantString("Image label");
 281   entry->module=ConstantString("LABEL");
 282   (void) RegisterMagickInfo(entry);
 283   return(MagickImageCoderSignature);
 284 }
 285 \f
 286 /*
 287 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 288 %                                                                             %
 289 %                                                                             %
 290 %                                                                             %
 291 %   U n r e g i s t e r L A B E L I m a g e                                   %
 292 %                                                                             %
 293 %                                                                             %
 294 %                                                                             %
 295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 296 %
 297 %  UnregisterLABELImage() removes format registrations made by the
 298 %  LABEL module from the list of supported formats.
 299 %
 300 %  The format of the UnregisterLABELImage method is:
 301 %
 302 %      UnregisterLABELImage(void)
 303 %
 304 */
 305 ModuleExport void UnregisterLABELImage(void)
 306 {
 307   (void) UnregisterMagickInfo("LABEL");
 308 }