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 1999-2017 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/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[MagickPathExtent],
  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 == MagickCoreSignature);
 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 == MagickCoreSignature);
 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   metrics.width=0;
 135   metrics.ascent=0.0;
 136   status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 137   if ((image->columns == 0) && (image->rows == 0))
 138     {
 139       image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 140       image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 141     }
 142   else
 143     if ((strlen(label) > 0) &&
 144         (((image->columns == 0) || (image->rows == 0)) ||
 145          (fabs(image_info->pointsize) < MagickEpsilon)))
 146       {
 147         double
 148           high,
 149           low;
 150
 151         /*
 152           Auto fit text into bounding box.
 153         */
 154         for ( ; ; draw_info->pointsize*=2.0)
 155         {
 156           (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
 157             -metrics.bounds.x1,metrics.ascent);
 158           if (draw_info->gravity == UndefinedGravity)
 159             (void) CloneString(&draw_info->geometry,geometry);
 160           status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 161           width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 162           height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 163           if ((image->columns != 0) && (image->rows != 0))
 164             {
 165               if ((width >= image->columns) && (height >= image->rows))
 166                 break;
 167             }
 168           else
 169             if (((image->columns != 0) && (width >= image->columns)) ||
 170                 ((image->rows != 0) && (height >= image->rows)))
 171               break;
 172         }
 173         high=draw_info->pointsize;
 174         for (low=1.0; (high-low) > 0.5; )
 175         {
 176           draw_info->pointsize=(low+high)/2.0;
 177           (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
 178             -metrics.bounds.x1,metrics.ascent);
 179           if (draw_info->gravity == UndefinedGravity)
 180             (void) CloneString(&draw_info->geometry,geometry);
 181           status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 182           width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 183           height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 184           if ((image->columns != 0) && (image->rows != 0))
 185             {
 186               if ((width < image->columns) && (height < image->rows))
 187                 low=draw_info->pointsize+0.5;
 188               else
 189                 high=draw_info->pointsize-0.5;
 190             }
 191           else
 192             if (((image->columns != 0) && (width < image->columns)) ||
 193                 ((image->rows != 0) && (height < image->rows)))
 194               low=draw_info->pointsize+0.5;
 195             else
 196               high=draw_info->pointsize-0.5;
 197         }
 198         draw_info->pointsize=(low+high)/2.0-0.5;
 199       }
 200    status=GetMultilineTypeMetrics(image,draw_info,&metrics,exception);
 201    if (status == MagickFalse)
 202      {
 203        draw_info=DestroyDrawInfo(draw_info);
 204        image=DestroyImageList(image);
 205        return((Image *) NULL);
 206      }
 207   if (image->columns == 0)
 208     image->columns=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 209   if (image->columns == 0)
 210     image->columns=(size_t) floor(draw_info->pointsize+draw_info->stroke_width+
 211       0.5);
 212   if (image->rows == 0)
 213     image->rows=(size_t) floor(metrics.ascent-metrics.descent+
 214       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   status=SetImageExtent(image,image->columns,image->rows,exception);
 219   if (status == MagickFalse)
 220     {
 221       draw_info=DestroyDrawInfo(draw_info);
 222       return(DestroyImageList(image));
 223     }
 224   if (SetImageBackgroundColor(image,exception) == MagickFalse)
 225     {
 226       draw_info=DestroyDrawInfo(draw_info);
 227       image=DestroyImageList(image);
 228       return((Image *) NULL);
 229     }
 230   /*
 231     Draw label.
 232   */
 233   (void) FormatLocaleString(geometry,MagickPathExtent,"%+g%+g",
 234     draw_info->direction == RightToLeftDirection ? image->columns-
 235     metrics.bounds.x2 : 0.0,draw_info->gravity == UndefinedGravity ?
 236     metrics.ascent : 0.0);
 237   (void) CloneString(&draw_info->geometry,geometry);
 238   status=AnnotateImage(image,draw_info,exception);
 239   if (image_info->pointsize == 0.0)
 240     {
 241       char
 242         pointsize[MagickPathExtent];
 243
 244       (void) FormatLocaleString(pointsize,MagickPathExtent,"%.20g",
 245         draw_info->pointsize);
 246       (void) SetImageProperty(image,"label:pointsize",pointsize,exception);
 247     }
 248   draw_info=DestroyDrawInfo(draw_info);
 249   if (status == MagickFalse)
 250     {
 251       image=DestroyImageList(image);
 252       return((Image *) NULL);
 253     }
 254   return(GetFirstImageInList(image));
 255 }
 256 \f
 257 /*
 258 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 259 %                                                                             %
 260 %                                                                             %
 261 %                                                                             %
 262 %   R e g i s t e r L A B E L I m a g e                                       %
 263 %                                                                             %
 264 %                                                                             %
 265 %                                                                             %
 266 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 267 %
 268 %  RegisterLABELImage() adds properties for the LABEL image format to
 269 %  the list of supported formats.  The properties include the image format
 270 %  tag, a method to read and/or write the format, whether the format
 271 %  supports the saving of more than one frame to the same file or blob,
 272 %  whether the format supports native in-memory I/O, and a brief
 273 %  description of the format.
 274 %
 275 %  The format of the RegisterLABELImage method is:
 276 %
 277 %      size_t RegisterLABELImage(void)
 278 %
 279 */
 280 ModuleExport size_t RegisterLABELImage(void)
 281 {
 282   MagickInfo
 283     *entry;
 284
 285   entry=AcquireMagickInfo("LABEL","LABEL","Image label");
 286   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 287   entry->flags^=CoderAdjoinFlag;
 288   entry->format_type=ImplicitFormatType;
 289   (void) RegisterMagickInfo(entry);
 290   return(MagickImageCoderSignature);
 291 }
 292 \f
 293 /*
 294 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 295 %                                                                             %
 296 %                                                                             %
 297 %                                                                             %
 298 %   U n r e g i s t e r L A B E L I m a g e                                   %
 299 %                                                                             %
 300 %                                                                             %
 301 %                                                                             %
 302 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 303 %
 304 %  UnregisterLABELImage() removes format registrations made by the
 305 %  LABEL module from the list of supported formats.
 306 %
 307 %  The format of the UnregisterLABELImage method is:
 308 %
 309 %      UnregisterLABELImage(void)
 310 %
 311 */
 312 ModuleExport void UnregisterLABELImage(void)
 313 {
 314   (void) UnregisterMagickInfo("LABEL");
 315 }