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 1999-2018 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 %    https://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/resource_.h"
  58 #include "MagickCore/static.h"
  59 #include "MagickCore/string_.h"
  60 #include "MagickCore/module.h"
  61 #include "MagickCore/utility.h"
  62 \f
  63 /*
  64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  65 %                                                                             %
  66 %                                                                             %
  67 %                                                                             %
  68 %   R e a d L A B E L I m a g e                                               %
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %
  74 %  ReadLABELImage() reads a LABEL image file and returns it.  It
  75 %  allocates the memory necessary for the new Image structure and returns a
  76 %  pointer to the new image.
  77 %
  78 %  The format of the ReadLABELImage method is:
  79 %
  80 %      Image *ReadLABELImage(const ImageInfo *image_info,
  81 %        ExceptionInfo *exception)
  82 %
  83 %  A description of each parameter follows:
  84 %
  85 %    o image_info: the image info.
  86 %
  87 %    o exception: return any errors or warnings in this structure.
  88 %
  89 */
  90 static Image *ReadLABELImage(const ImageInfo *image_info,
  91   ExceptionInfo *exception)
  92 {
  93   char
  94     geometry[MagickPathExtent],
  95     *label;
  96
  97   DrawInfo
  98     *draw_info;
  99
 100   Image
 101     *image;
 102
 103   MagickBooleanType
 104     status;
 105
 106   TypeMetric
 107     metrics;
 108
 109   size_t
 110     height,
 111     width;
 112
 113   /*
 114     Initialize Image structure.
 115   */
 116   assert(image_info != (const ImageInfo *) NULL);
 117   assert(image_info->signature == MagickCoreSignature);
 118   if (image_info->debug != MagickFalse)
 119     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 120       image_info->filename);
 121   assert(exception != (ExceptionInfo *) NULL);
 122   assert(exception->signature == MagickCoreSignature);
 123   image=AcquireImage(image_info,exception);
 124   (void) ResetImagePage(image,"0x0+0+0");
 125   if ((image->columns != 0) && (image->rows != 0))
 126     (void) SetImageBackgroundColor(image,exception);
 127   label=InterpretImageProperties((ImageInfo *) image_info,image,
 128     image_info->filename,exception);
 129   if (label == (char *) NULL)
 130     return(DestroyImageList(image));
 131   (void) SetImageProperty(image,"label",label,exception);
 132   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
 133   width=(size_t) floor(draw_info->pointsize*strlen(label)+0.5);
 134   if (AcquireMagickResource(WidthResource,width) == MagickFalse)
 135     {
 136       label=DestroyString(label);
 137       draw_info=DestroyDrawInfo(draw_info);
 138       ThrowReaderException(ImageError,"WidthOrHeightExceedsLimit");
 139     }
 140   draw_info->text=ConstantString(label);
 141   metrics.width=0.0;
 142   metrics.height=0.0;
 143   metrics.ascent=0.0;
 144   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 145   if ((image->columns == 0) && (image->rows == 0))
 146     {
 147       image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 148       image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 149     }
 150   else
 151     if ((status != MagickFalse) && (strlen(label) > 0) &&
 152         (((image->columns == 0) || (image->rows == 0)) ||
 153          (fabs(image_info->pointsize) < MagickEpsilon)))
 154       {
 155         double
 156           high,
 157           low;
 158
 159         ssize_t
 160           n;
 161
 162         /*
 163           Auto fit text into bounding box.
 164         */
 165         for (n=0; n < 32; n++, draw_info->pointsize*=2.0)
 166         {
 167           (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
 168             -metrics.bounds.x1,metrics.ascent);
 169           if (draw_info->gravity == UndefinedGravity)
 170             (void) CloneString(&draw_info->geometry,geometry);
 171           status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 172           if (status == MagickFalse)
 173             break;
 174           width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 175           height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 176           if ((image->columns != 0) && (image->rows != 0))
 177             {
 178               if ((width >= image->columns) && (height >= image->rows))
 179                 break;
 180             }
 181           else
 182             if (((image->columns != 0) && (width >= image->columns)) ||
 183                 ((image->rows != 0) && (height >= image->rows)))
 184               break;
 185         }
 186         if (status == MagickFalse)
 187           {
 188             label=DestroyString(label);
 189             draw_info=DestroyDrawInfo(draw_info);
 190             image=DestroyImageList(image);
 191             return((Image *) NULL);
 192           }
 193         high=draw_info->pointsize;
 194         for (low=1.0; (high-low) > 0.5; )
 195         {
 196           draw_info->pointsize=(low+high)/2.0;
 197           (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
 198             -metrics.bounds.x1,metrics.ascent);
 199           if (draw_info->gravity == UndefinedGravity)
 200             (void) CloneString(&draw_info->geometry,geometry);
 201           status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 202           if (status == MagickFalse)
 203             break;
 204           width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 205           height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 206           if ((image->columns != 0) && (image->rows != 0))
 207             {
 208               if ((width < image->columns) && (height < image->rows))
 209                 low=draw_info->pointsize+0.5;
 210               else
 211                 high=draw_info->pointsize-0.5;
 212             }
 213           else
 214             if (((image->columns != 0) && (width < image->columns)) ||
 215                 ((image->rows != 0) && (height < image->rows)))
 216               low=draw_info->pointsize+0.5;
 217             else
 218               high=draw_info->pointsize-0.5;
 219         }
 220         if (status != MagickFalse)
 221           {
 222             draw_info->pointsize=(low+high)/2.0-0.5;
 223             status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 224           }
 225       }
 226    label=DestroyString(label);
 227    if (status == MagickFalse)
 228      {
 229        draw_info=DestroyDrawInfo(draw_info);
 230        image=DestroyImageList(image);
 231        return((Image *) NULL);
 232      }
 233   if (image->columns == 0)
 234     image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 235   if (image->columns == 0)
 236     image->columns=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
 237       0.5);
 238   if (image->rows == 0)
 239     image->rows=(size_t) floor(metrics.ascent-metrics.descent+
 240       draw_info->stroke_width+0.5);
 241   if (image->rows == 0)
 242     image->rows=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
 243       0.5);
 244   status=SetImageExtent(image,image->columns,image->rows,exception);
 245   if (status == MagickFalse)
 246     {
 247       draw_info=DestroyDrawInfo(draw_info);
 248       return(DestroyImageList(image));
 249     }
 250   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 251     {
 252       draw_info=DestroyDrawInfo(draw_info);
 253       image=DestroyImageList(image);
 254       return((Image *) NULL);
 255     }
 256   /*
 257     Draw label.
 258   */
 259   (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
 260     draw_info->direction == RightToLeftDirection ? (double) image->columns-
 261     metrics.bounds.x2 : 0.0,draw_info->gravity == UndefinedGravity ?
 262     MagickMax(metrics.ascent,metrics.bounds.y2) : 0.0);
 263   (void) CloneString(&draw_info->geometry,geometry);
 264   status=AnnotateImage(image,draw_info,exception);
 265   if (image_info->pointsize == 0.0)
 266     {
 267       char
 268         pointsize[MagickPathExtent];
 269
 270       (void) FormatLocaleString(pointsize,MagickPathExtent,"%.20g",
 271         draw_info->pointsize);
 272       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 273     }
 274   draw_info=DestroyDrawInfo(draw_info);
 275   if (status == MagickFalse)
 276     {
 277       image=DestroyImageList(image);
 278       return((Image *) NULL);
 279     }
 280   return(GetFirstImageInList(image));
 281 }
 282 \f
 283 /*
 284 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 285 %                                                                             %
 286 %                                                                             %
 287 %                                                                             %
 288 %   R e g i s t e r L A B E L I m a g e                                       %
 289 %                                                                             %
 290 %                                                                             %
 291 %                                                                             %
 292 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 293 %
 294 %  RegisterLABELImage() adds properties for the LABEL image format to
 295 %  the list of supported formats.  The properties include the image format
 296 %  tag, a method to read and/or write the format, whether the format
 297 %  supports the saving of more than one frame to the same file or blob,
 298 %  whether the format supports native in-memory I/O, and a brief
 299 %  description of the format.
 300 %
 301 %  The format of the RegisterLABELImage method is:
 302 %
 303 %      size_t RegisterLABELImage(void)
 304 %
 305 */
 306 ModuleExport size_t RegisterLABELImage(void)
 307 {
 308   MagickInfo
 309     *entry;
 310
 311   entry=AcquireMagickInfo("LABEL","LABEL","Image label");
 312   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 313   entry->flags^=CoderAdjoinFlag;
 314   entry->format_type=ImplicitFormatType;
 315   (void) RegisterMagickInfo(entry);
 316   return(MagickImageCoderSignature);
 317 }
 318 \f
 319 /*
 320 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 321 %                                                                             %
 322 %                                                                             %
 323 %                                                                             %
 324 %   U n r e g i s t e r L A B E L I m a g e                                   %
 325 %                                                                             %
 326 %                                                                             %
 327 %                                                                             %
 328 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 329 %
 330 %  UnregisterLABELImage() removes format registrations made by the
 331 %  LABEL module from the list of supported formats.
 332 %
 333 %  The format of the UnregisterLABELImage method is:
 334 %
 335 %      UnregisterLABELImage(void)
 336 %
 337 */
 338 ModuleExport void UnregisterLABELImage(void)
 339 {
 340   (void) UnregisterMagickInfo("LABEL");
 341 }