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       for ( ; ; )
 143       {
 144         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 145           -metrics.bounds.x1,metrics.ascent);
 146         if (draw_info->gravity == UndefinedGravity)
 147           (void) CloneString(&draw_info->geometry,geometry);
 148         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 149         (void) status;
 150         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 151         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 152         if ((width > image->columns) && (height > image->rows))
 153           break;
 154         draw_info->pointsize*=2.0;
 155       }
 156       high=draw_info->pointsize/2.0;
 157       low=high/2.0;
 158       while ((high-low) > 1.0)
 159       {
 160         draw_info->pointsize=(low+high)/2.0;
 161         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 162           -metrics.bounds.x1,metrics.ascent);
 163         if (draw_info->gravity == UndefinedGravity)
 164           (void) CloneString(&draw_info->geometry,geometry);
 165         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 166         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 167         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 168         if ((width <= image->columns) && (height <= image->rows))
 169           low=draw_info->pointsize+1.0;
 170         else
 171           high=draw_info->pointsize-1.0;
 172       }
 173       for (draw_info->pointsize=(low+high)/2.0; ; )
 174       {
 175         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 176           -metrics.bounds.x1,metrics.ascent);
 177         if (draw_info->gravity == UndefinedGravity)
 178           (void) CloneString(&draw_info->geometry,geometry);
 179         status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 180         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 181         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 182         if ((width <= image->columns) && (height <= image->rows))
 183           break;
 184         draw_info->pointsize--;
 185       }
 186       draw_info->pointsize=floor(draw_info->pointsize);
 187     }
 188   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 189   if (status == MagickFalse)
 190     {
 191       image=DestroyImageList(image);
 192       return((Image *) NULL);
 193     }
 194   if (image->columns == 0)
 195     image->columns=(size_t) (metrics.width+draw_info->stroke_width+1.5);
 196   if (image->columns == 0)
 197     image->columns=(size_t) (draw_info->pointsize+draw_info->stroke_width+1.5);
 198   if (draw_info->gravity == UndefinedGravity)
 199     {
 200       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 201         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
 202         draw_info->stroke_width/2.0);
 203       (void) CloneString(&draw_info->geometry,geometry);
 204     }
 205   if (draw_info->direction == RightToLeftDirection)
 206     {
 207       if (draw_info->direction == RightToLeftDirection)
 208         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 209           image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
 210           metrics.ascent+draw_info->stroke_width/2.0);
 211       (void) CloneString(&draw_info->geometry,geometry);
 212     }
 213   if (image->rows == 0)
 214     image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 215   if (image->rows == 0)
 216     image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
 217       0.5);
 218   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 219     {
 220       image=DestroyImageList(image);
 221       return((Image *) NULL);
 222     }
 223   (void) AnnotateImage(image,draw_info,exception);
 224   if (image_info->pointsize == 0.0)
 225     {
 226       char
 227         pointsize[MaxTextExtent];
 228
 229       (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
 230         draw_info->pointsize);
 231       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 232     }
 233   draw_info=DestroyDrawInfo(draw_info);
 234   return(GetFirstImageInList(image));
 235 }
 236 \f
 237 /*
 238 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 239 %                                                                             %
 240 %                                                                             %
 241 %                                                                             %
 242 %   R e g i s t e r L A B E L I m a g e                                       %
 243 %                                                                             %
 244 %                                                                             %
 245 %                                                                             %
 246 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 247 %
 248 %  RegisterLABELImage() adds properties for the LABEL image format to
 249 %  the list of supported formats.  The properties include the image format
 250 %  tag, a method to read and/or write the format, whether the format
 251 %  supports the saving of more than one frame to the same file or blob,
 252 %  whether the format supports native in-memory I/O, and a brief
 253 %  description of the format.
 254 %
 255 %  The format of the RegisterLABELImage method is:
 256 %
 257 %      size_t RegisterLABELImage(void)
 258 %
 259 */
 260 ModuleExport size_t RegisterLABELImage(void)
 261 {
 262   MagickInfo
 263     *entry;
 264
 265   entry=SetMagickInfo("LABEL");
 266   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 267   entry->adjoin=MagickFalse;
 268   entry->format_type=ImplicitFormatType;
 269   entry->description=ConstantString("Image label");
 270   entry->module=ConstantString("LABEL");
 271   (void) RegisterMagickInfo(entry);
 272   return(MagickImageCoderSignature);
 273 }
 274 \f
 275 /*
 276 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 277 %                                                                             %
 278 %                                                                             %
 279 %                                                                             %
 280 %   U n r e g i s t e r L A B E L I m a g e                                   %
 281 %                                                                             %
 282 %                                                                             %
 283 %                                                                             %
 284 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 285 %
 286 %  UnregisterLABELImage() removes format registrations made by the
 287 %  LABEL module from the list of supported formats.
 288 %
 289 %  The format of the UnregisterLABELImage method is:
 290 %
 291 %      UnregisterLABELImage(void)
 292 %
 293 */
 294 ModuleExport void UnregisterLABELImage(void)
 295 {
 296   (void) UnregisterMagickInfo("LABEL");
 297 }