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 1999-2012 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/annotate.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/draw.h"
  47 #include "MagickCore/exception.h"
  48 #include "MagickCore/exception-private.h"
  49 #include "MagickCore/image.h"
  50 #include "MagickCore/image-private.h"
  51 #include "MagickCore/list.h"
  52 #include "MagickCore/magick.h"
  53 #include "MagickCore/memory_.h"
  54 #include "MagickCore/property.h"
  55 #include "MagickCore/quantum-private.h"
  56 #include "MagickCore/static.h"
  57 #include "MagickCore/string_.h"
  58 #include "MagickCore/module.h"
  59 #include "MagickCore/utility.h"
  60 \f
  61 /*
  62 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  63 %                                                                             %
  64 %                                                                             %
  65 %                                                                             %
  66 %   R e a d L A B E L I m a g e                                               %
  67 %                                                                             %
  68 %                                                                             %
  69 %                                                                             %
  70 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  71 %
  72 %  ReadLABELImage() reads a LABEL 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 ReadLABELImage method is:
  77 %
  78 %      Image *ReadLABELImage(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 *ReadLABELImage(const ImageInfo *image_info,
  89   ExceptionInfo *exception)
  90 {
  91   char
  92     geometry[MaxTextExtent],
  93     *property;
  94
  95   const char
  96     *label;
  97
  98   DrawInfo
  99     *draw_info;
 100
 101   Image
 102     *image;
 103
 104   MagickBooleanType
 105     status;
 106
 107   TypeMetric
 108     metrics;
 109
 110   size_t
 111     height,
 112     width;
 113
 114   /*
 115     Initialize Image structure.
 116   */
 117   assert(image_info != (const ImageInfo *) NULL);
 118   assert(image_info->signature == MagickSignature);
 119   if (image_info->debug != MagickFalse)
 120     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 121       image_info->filename);
 122   assert(exception != (ExceptionInfo *) NULL);
 123   assert(exception->signature == MagickSignature);
 124   image=AcquireImage(image_info,exception);
 125   (void) ResetImagePage(image,"0x0+0+0");
 126   property=InterpretImageProperties(image_info,image,image_info->filename,
 127     exception);
 128   (void) SetImageProperty(image,"label",property,exception);
 129   property=DestroyString(property);
 130   label=GetImageProperty(image,"label",exception);
 131   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
 132   draw_info->text=ConstantString(label);
 133   if ((*label != '\0') && (image->rows != 0) && (image_info->pointsize == 0.0))
 134     {
 135       double
 136         high,
 137         low;
 138
 139       /*
 140         Auto fit text into bounding box.
 141       */
 142       status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 143       for ( ; ; )
 144       {
 145         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 146           -metrics.bounds.x1,metrics.ascent);
 147         if (draw_info->gravity == UndefinedGravity)
 148           (void) CloneString(&draw_info->geometry,geometry);
 149         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 150         (void) status;
 151         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 152         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 153         if ((width > image->columns) && (height > image->rows))
 154           break;
 155         draw_info->pointsize*=2.0;
 156       }
 157       high=draw_info->pointsize/2.0;
 158       low=high/2.0;
 159       while ((high-low) > 1.0)
 160       {
 161         draw_info->pointsize=(low+high)/2.0;
 162         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 163           -metrics.bounds.x1,metrics.ascent);
 164         if (draw_info->gravity == UndefinedGravity)
 165           (void) CloneString(&draw_info->geometry,geometry);
 166         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 167         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 168         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 169         if ((width <= image->columns) && (height <= image->rows))
 170           low=draw_info->pointsize+1.0;
 171         else
 172           high=draw_info->pointsize-1.0;
 173       }
 174       for (draw_info->pointsize=(low+high)/2.0; (high-low) > 1.0; )
 175       {
 176         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 177           -metrics.bounds.x1,metrics.ascent);
 178         if (draw_info->gravity == UndefinedGravity)
 179           (void) CloneString(&draw_info->geometry,geometry);
 180         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 181         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 182         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 183         if ((width <= image->columns) && (height <= image->rows))
 184           break;
 185         draw_info->pointsize--;
 186       }
 187       draw_info->pointsize=floor(draw_info->pointsize);
 188     }
 189   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 190   if (status == MagickFalse)
 191     {
 192       image=DestroyImageList(image);
 193       return((Image *) NULL);
 194     }
 195   if (image->columns == 0)
 196     image->columns=(size_t) (metrics.width+draw_info->stroke_width+1.5);
 197   if (image->columns == 0)
 198     image->columns=(size_t) (draw_info->pointsize+draw_info->stroke_width+1.5);
 199   if (draw_info->gravity == UndefinedGravity)
 200     {
 201       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 202         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
 203         draw_info->stroke_width/2.0);
 204       (void) CloneString(&draw_info->geometry,geometry);
 205     }
 206   if (draw_info->direction == RightToLeftDirection)
 207     {
 208       if (draw_info->direction == RightToLeftDirection)
 209         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 210           image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
 211           metrics.ascent+draw_info->stroke_width/2.0);
 212       (void) CloneString(&draw_info->geometry,geometry);
 213     }
 214   if (image->rows == 0)
 215     image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 216   if (image->rows == 0)
 217     image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
 218       0.5);
 219   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 220     {
 221       image=DestroyImageList(image);
 222       return((Image *) NULL);
 223     }
 224   (void) AnnotateImage(image,draw_info,exception);
 225   if (image_info->pointsize == 0.0)
 226     {
 227       char
 228         pointsize[MaxTextExtent];
 229
 230       (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
 231         draw_info->pointsize);
 232       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 233     }
 234   draw_info=DestroyDrawInfo(draw_info);
 235   return(GetFirstImageInList(image));
 236 }
 237 \f
 238 /*
 239 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 240 %                                                                             %
 241 %                                                                             %
 242 %                                                                             %
 243 %   R e g i s t e r L A B E L I m a g e                                       %
 244 %                                                                             %
 245 %                                                                             %
 246 %                                                                             %
 247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 248 %
 249 %  RegisterLABELImage() adds properties for the LABEL image format to
 250 %  the list of supported formats.  The properties include the image format
 251 %  tag, a method to read and/or write the format, whether the format
 252 %  supports the saving of more than one frame to the same file or blob,
 253 %  whether the format supports native in-memory I/O, and a brief
 254 %  description of the format.
 255 %
 256 %  The format of the RegisterLABELImage method is:
 257 %
 258 %      size_t RegisterLABELImage(void)
 259 %
 260 */
 261 ModuleExport size_t RegisterLABELImage(void)
 262 {
 263   MagickInfo
 264     *entry;
 265
 266   entry=SetMagickInfo("LABEL");
 267   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 268   entry->adjoin=MagickFalse;
 269   entry->format_type=ImplicitFormatType;
 270   entry->description=ConstantString("Image label");
 271   entry->module=ConstantString("LABEL");
 272   (void) RegisterMagickInfo(entry);
 273   return(MagickImageCoderSignature);
 274 }
 275 \f
 276 /*
 277 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 278 %                                                                             %
 279 %                                                                             %
 280 %                                                                             %
 281 %   U n r e g i s t e r L A B E L I m a g e                                   %
 282 %                                                                             %
 283 %                                                                             %
 284 %                                                                             %
 285 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 286 %
 287 %  UnregisterLABELImage() removes format registrations made by the
 288 %  LABEL module from the list of supported formats.
 289 %
 290 %  The format of the UnregisterLABELImage method is:
 291 %
 292 %      UnregisterLABELImage(void)
 293 %
 294 */
 295 ModuleExport void UnregisterLABELImage(void)
 296 {
 297   (void) UnregisterMagickInfo("LABEL");
 298 }