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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2014 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((ImageInfo *) image_info,image,
 128     image_info->filename,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) && (image->rows == 0))
 136     {
 137       image->columns=(size_t) (metrics.width+draw_info->stroke_width+0.5);
 138       image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 139     }
 140   else
 141     if (((image->columns == 0) || (image->rows == 0)) ||
 142         (fabs(image_info->pointsize) < MagickEpsilon))
 143       {
 144         double
 145           high,
 146           low;
 147
 148         /*
 149           Auto fit text into bounding box.
 150         */
 151         for ( ; ; draw_info->pointsize*=2.0)
 152         {
 153           (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 154             -metrics.bounds.x1,metrics.ascent);
 155           if (draw_info->gravity == UndefinedGravity)
 156             (void) CloneString(&draw_info->geometry,geometry);
 157           status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 158           width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 159           height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 160           if ((image->columns != 0) && (image->rows != 0))
 161             {
 162               if ((width >= image->columns) && (height >= image->rows))
 163                 break;
 164             }
 165           else
 166             if (((image->columns != 0) && (width >= image->columns)) ||
 167                 ((image->rows != 0) && (height >= image->rows)))
 168               break;
 169         }
 170         high=draw_info->pointsize;
 171         for (low=1.0; (high-low) > 0.5; )
 172         {
 173           draw_info->pointsize=(low+high)/2.0;
 174           (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 175             -metrics.bounds.x1,metrics.ascent);
 176           if (draw_info->gravity == UndefinedGravity)
 177             (void) CloneString(&draw_info->geometry,geometry);
 178           status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 179           width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 180           height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 181           if ((image->columns != 0) && (image->rows != 0))
 182             {
 183               if ((width < image->columns) && (height < image->rows))
 184                 low=draw_info->pointsize+0.5;
 185               else
 186                 high=draw_info->pointsize-0.5;
 187             }
 188           else
 189             if (((image->columns != 0) && (width < image->columns)) ||
 190                 ((image->rows != 0) && (height < image->rows)))
 191               low=draw_info->pointsize+0.5;
 192             else
 193               high=draw_info->pointsize-0.5;
 194         }
 195         draw_info->pointsize=(low+high)/2.0-0.5;
 196       }
 197   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 198   if (status == MagickFalse)
 199     {
 200       image=DestroyImageList(image);
 201       return((Image *) NULL);
 202     }
 203   if (image->columns == 0)
 204     image->columns=(size_t) (metrics.width+draw_info->stroke_width+0.5);
 205   if (image->columns == 0)
 206     image->columns=(size_t) (draw_info->pointsize+draw_info->stroke_width+0.5);
 207   if (image->rows == 0)
 208     image->rows=(size_t) (metrics.ascent-metrics.descent+
 209       draw_info->stroke_width+0.5);
 210   if (image->rows == 0)
 211     image->rows=(size_t) (draw_info->pointsize+draw_info->stroke_width+0.5);
 212   if (draw_info->gravity == UndefinedGravity)
 213     {
 214       (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 215         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
 216         draw_info->stroke_width/2.0);
 217       (void) CloneString(&draw_info->geometry,geometry);
 218     }
 219   if (draw_info->direction == RightToLeftDirection)
 220     {
 221       if (draw_info->direction == RightToLeftDirection)
 222         (void) FormatLocaleString(geometry,MaxTextExtent,"%+g%+g",
 223           image->columns-(metrics.bounds.x2+draw_info->stroke_width/2.0),
 224           metrics.ascent+draw_info->stroke_width/2.0);
 225       (void) CloneString(&draw_info->geometry,geometry);
 226     }
 227   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 228     {
 229       image=DestroyImageList(image);
 230       return((Image *) NULL);
 231     }
 232   (void) AnnotateImage(image,draw_info,exception);
 233   if (image_info->pointsize == 0.0)
 234     {
 235       char
 236         pointsize[MaxTextExtent];
 237
 238       (void) FormatLocaleString(pointsize,MaxTextExtent,"%.20g",
 239         draw_info->pointsize);
 240       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 241     }
 242   draw_info=DestroyDrawInfo(draw_info);
 243   return(GetFirstImageInList(image));
 244 }
 245 \f
 246 /*
 247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 248 %                                                                             %
 249 %                                                                             %
 250 %                                                                             %
 251 %   R e g i s t e r L A B E L I m a g e                                       %
 252 %                                                                             %
 253 %                                                                             %
 254 %                                                                             %
 255 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 256 %
 257 %  RegisterLABELImage() adds properties for the LABEL image format to
 258 %  the list of supported formats.  The properties include the image format
 259 %  tag, a method to read and/or write the format, whether the format
 260 %  supports the saving of more than one frame to the same file or blob,
 261 %  whether the format supports native in-memory I/O, and a brief
 262 %  description of the format.
 263 %
 264 %  The format of the RegisterLABELImage method is:
 265 %
 266 %      size_t RegisterLABELImage(void)
 267 %
 268 */
 269 ModuleExport size_t RegisterLABELImage(void)
 270 {
 271   MagickInfo
 272     *entry;
 273
 274   entry=SetMagickInfo("LABEL");
 275   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 276   entry->adjoin=MagickFalse;
 277   entry->format_type=ImplicitFormatType;
 278   entry->description=ConstantString("Image label");
 279   entry->module=ConstantString("LABEL");
 280   (void) RegisterMagickInfo(entry);
 281   return(MagickImageCoderSignature);
 282 }
 283 \f
 284 /*
 285 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 286 %                                                                             %
 287 %                                                                             %
 288 %                                                                             %
 289 %   U n r e g i s t e r L A B E L I m a g e                                   %
 290 %                                                                             %
 291 %                                                                             %
 292 %                                                                             %
 293 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 294 %
 295 %  UnregisterLABELImage() removes format registrations made by the
 296 %  LABEL module from the list of supported formats.
 297 %
 298 %  The format of the UnregisterLABELImage method is:
 299 %
 300 %      UnregisterLABELImage(void)
 301 %
 302 */
 303 ModuleExport void UnregisterLABELImage(void)
 304 {
 305   (void) UnregisterMagickInfo("LABEL");
 306 }