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/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   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 134   if (image->columns == 0)
 135     {
 136       for ( ; ; draw_info->pointsize*=2.0)
 137       {
 138         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 139           -metrics.bounds.x1,metrics.ascent);
 140         if (draw_info->gravity == UndefinedGravity)
 141           (void) CloneString(&draw_info->geometry,geometry);
 142         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 143         (void) status;
 144         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 145         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 146         if ((height > image->rows) || (image_info->pointsize != 0.0))
 147           break;
 148       }
 149       image->columns=width;
 150     }
 151   if (image->rows == 0)
 152     {
 153       for ( ; ; draw_info->pointsize*=2.0)
 154       {
 155         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 156           -metrics.bounds.x1,metrics.ascent);
 157         if (draw_info->gravity == UndefinedGravity)
 158           (void) CloneString(&draw_info->geometry,geometry);
 159         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 160         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 161         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 162         if ((width > image->columns) || (image_info->pointsize != 0.0))
 163           break;
 164       }
 165       image->rows=height;
 166     }
 167   if (image_info->pointsize == 0.0)
 168     {
 169       double
 170         high,
 171         low;
 172
 173       /*
 174         Auto fit text into bounding box.
 175       */
 176       for ( ; ; draw_info->pointsize*=2.0)
 177       {
 178         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 179           -metrics.bounds.x1,metrics.ascent);
 180         if (draw_info->gravity == UndefinedGravity)
 181           (void) CloneString(&draw_info->geometry,geometry);
 182         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 183         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 184         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 185         if ((width > image->columns) && (height > image->rows))
 186           break;
 187         if ((width > (image->columns << 1)) || (height > (image->rows << 1)))
 188           break;
 189       }
 190       high=draw_info->pointsize/2.0;
 191       for (low=high/2.0; (high-low) > 1.0; )
 192       {
 193         draw_info->pointsize=(low+high)/2.0;
 194         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 195           -metrics.bounds.x1,metrics.ascent);
 196         if (draw_info->gravity == UndefinedGravity)
 197           (void) CloneString(&draw_info->geometry,geometry);
 198         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 199         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 200         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 201         if ((width <= image->columns) && (height <= image->rows))
 202           low=draw_info->pointsize+1.0;
 203         else
 204           high=draw_info->pointsize-1.0;
 205       }
 206       for (draw_info->pointsize=(low+high)/2.0; (high-low) > 1.0; )
 207       {
 208         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 209           -metrics.bounds.x1,metrics.ascent);
 210         if (draw_info->gravity == UndefinedGravity)
 211           (void) CloneString(&draw_info->geometry,geometry);
 212         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 213         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 214         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 215         if ((width <= image->columns) && (height <= image->rows))
 216           break;
 217         draw_info->pointsize--;
 218       }
 219       draw_info->pointsize=floor(draw_info->pointsize+0.5);
 220     }
 221   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 222   if (status == MagickFalse)
 223     {
 224       image=DestroyImageList(image);
 225       return((Image *) NULL);
 226     }
 227   if (draw_info->gravity == UndefinedGravity)
 228     {
 229       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 230         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
 231         draw_info->stroke_width/2.0);
 232       (void) CloneString(&draw_info->geometry,geometry);
 233     }
 234   if (draw_info->direction == RightToLeftDirection)
 235     {
 236       if (draw_info->direction == RightToLeftDirection)
 237         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 238           image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
 239           metrics.ascent+draw_info->stroke_width/2.0);
 240       (void) CloneString(&draw_info->geometry,geometry);
 241     }
 242   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 243     {
 244       image=DestroyImageList(image);
 245       return((Image *) NULL);
 246     }
 247   (void) AnnotateImage(image,draw_info,exception);
 248   if (image_info->pointsize == 0.0)
 249     {
 250       char
 251         pointsize[MaxTextExtent];
 252
 253       (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
 254         draw_info->pointsize);
 255       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 256     }
 257   draw_info=DestroyDrawInfo(draw_info);
 258   return(GetFirstImageInList(image));
 259 }
 260 \f
 261 /*
 262 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 263 %                                                                             %
 264 %                                                                             %
 265 %                                                                             %
 266 %   R e g i s t e r L A B E L I m a g e                                       %
 267 %                                                                             %
 268 %                                                                             %
 269 %                                                                             %
 270 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 271 %
 272 %  RegisterLABELImage() adds properties for the LABEL image format to
 273 %  the list of supported formats.  The properties include the image format
 274 %  tag, a method to read and/or write the format, whether the format
 275 %  supports the saving of more than one frame to the same file or blob,
 276 %  whether the format supports native in-memory I/O, and a brief
 277 %  description of the format.
 278 %
 279 %  The format of the RegisterLABELImage method is:
 280 %
 281 %      size_t RegisterLABELImage(void)
 282 %
 283 */
 284 ModuleExport size_t RegisterLABELImage(void)
 285 {
 286   MagickInfo
 287     *entry;
 288
 289   entry=SetMagickInfo("LABEL");
 290   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 291   entry->adjoin=MagickFalse;
 292   entry->format_type=ImplicitFormatType;
 293   entry->description=ConstantString("Image label");
 294   entry->module=ConstantString("LABEL");
 295   (void) RegisterMagickInfo(entry);
 296   return(MagickImageCoderSignature);
 297 }
 298 \f
 299 /*
 300 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 301 %                                                                             %
 302 %                                                                             %
 303 %                                                                             %
 304 %   U n r e g i s t e r L A B E L I m a g e                                   %
 305 %                                                                             %
 306 %                                                                             %
 307 %                                                                             %
 308 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 309 %
 310 %  UnregisterLABELImage() removes format registrations made by the
 311 %  LABEL module from the list of supported formats.
 312 %
 313 %  The format of the UnregisterLABELImage method is:
 314 %
 315 %      UnregisterLABELImage(void)
 316 %
 317 */
 318 ModuleExport void UnregisterLABELImage(void)
 319 {
 320   (void) UnregisterMagickInfo("LABEL");
 321 }