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 1999-2011 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 "magick/studio.h"
  43 #include "magick/annotate.h"
  44 #include "magick/blob.h"
  45 #include "magick/blob-private.h"
  46 #include "magick/draw.h"
  47 #include "magick/exception.h"
  48 #include "magick/exception-private.h"
  49 #include "magick/image.h"
  50 #include "magick/image-private.h"
  51 #include "magick/list.h"
  52 #include "magick/magick.h"
  53 #include "magick/memory_.h"
  54 #include "magick/property.h"
  55 #include "magick/quantum-private.h"
  56 #include "magick/static.h"
  57 #include "magick/string_.h"
  58 #include "magick/module.h"
  59 #include "magick/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);
 125   (void) ResetImagePage(image,"0x0+0+0");
 126   property=InterpretImageProperties(image_info,image,image_info->filename);
 127   (void) SetImageProperty(image,"label",property);
 128   property=DestroyString(property);
 129   label=GetImageProperty(image,"label");
 130   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
 131   draw_info->text=ConstantString(label);
 132   if (((image->columns != 0) || (image->rows != 0)) &&
 133       (image_info->pointsize == 0.0))
 134     {
 135       /*
 136         Fit label to canvas size.
 137       */
 138       status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 139       for ( ; status != MagickFalse; draw_info->pointsize*=2.0)
 140       {
 141         width=(size_t) floor(metrics.width+draw_info->stroke_width+0.5);
 142         height=(size_t) floor(metrics.height+draw_info->stroke_width+0.5);
 143         if (((image->columns != 0) && (width > (image->columns+1))) ||
 144             ((image->rows != 0) && (height > (image->rows+1))))
 145           break;
 146         status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 147       }
 148       for ( ; status != MagickFalse; draw_info->pointsize--)
 149       {
 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 ((image->columns != 0) && (width <= (image->columns+1)) &&
 153            ((image->rows == 0) || (height <= (image->rows+1))))
 154           break;
 155         if ((image->rows != 0) && (height <= (image->rows+1)) &&
 156            ((image->columns == 0) || (width <= (image->columns+1))))
 157           break;
 158         if (draw_info->pointsize < 2.0)
 159           break;
 160         status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 161       }
 162     }
 163   status=GetMultilineTypeMetrics(image,draw_info,&metrics);
 164   if (status == MagickFalse)
 165     {
 166       InheritException(exception,&image->exception);
 167       image=DestroyImageList(image);
 168       return((Image *) NULL);
 169     }
 170   if (image->columns == 0)
 171     image->columns=(size_t) (metrics.width+draw_info->stroke_width+1.5);
 172   if (image->columns == 0)
 173     image->columns=(size_t) (draw_info->pointsize+
 174       draw_info->stroke_width+1.5);
 175   if (draw_info->gravity == UndefinedGravity)
 176     {
 177       (void) FormatMagickString(geometry,MaxTextExtent,"%+g%+g",
 178         -metrics.bounds.x1+draw_info->stroke_width/2.0,metrics.ascent+
 179         draw_info->stroke_width/2.0);
 180       draw_info->geometry=AcquireString(geometry);
 181     }
 182   if (image->rows == 0)
 183     image->rows=(size_t) floor(metrics.height+draw_info->stroke_width+
 184       0.5);
 185   if (image->rows == 0)
 186     image->rows=(size_t) floor(draw_info->pointsize+
 187       draw_info->stroke_width+0.5);
 188   if (SetImageBackgroundColor(image) == MagickFalse)
 189     {
 190       InheritException(exception,&image->exception);
 191       image=DestroyImageList(image);
 192       return((Image *) NULL);
 193     }
 194   (void) AnnotateImage(image,draw_info);
 195   if (image_info->pointsize == 0.0)
 196     {
 197       char
 198         pointsize[MaxTextExtent];
 199
 200       (void) FormatMagickString(pointsize,MaxTextExtent,"%.20g",
 201         draw_info->pointsize);
 202       (void) SetImageProperty(image,"label:pointsize",pointsize);
 203     }
 204   draw_info=DestroyDrawInfo(draw_info);
 205   return(GetFirstImageInList(image));
 206 }
 207 \f
 208 /*
 209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 210 %                                                                             %
 211 %                                                                             %
 212 %                                                                             %
 213 %   R e g i s t e r L A B E L I m a g e                                       %
 214 %                                                                             %
 215 %                                                                             %
 216 %                                                                             %
 217 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 218 %
 219 %  RegisterLABELImage() adds properties for the LABEL image format to
 220 %  the list of supported formats.  The properties include the image format
 221 %  tag, a method to read and/or write the format, whether the format
 222 %  supports the saving of more than one frame to the same file or blob,
 223 %  whether the format supports native in-memory I/O, and a brief
 224 %  description of the format.
 225 %
 226 %  The format of the RegisterLABELImage method is:
 227 %
 228 %      size_t RegisterLABELImage(void)
 229 %
 230 */
 231 ModuleExport size_t RegisterLABELImage(void)
 232 {
 233   MagickInfo
 234     *entry;
 235
 236   entry=SetMagickInfo("LABEL");
 237   entry->decoder=(DecodeImageHandler *) ReadLABELImage;
 238   entry->adjoin=MagickFalse;
 239   entry->format_type=ImplicitFormatType;
 240   entry->description=ConstantString("Image label");
 241   entry->module=ConstantString("LABEL");
 242   (void) RegisterMagickInfo(entry);
 243   return(MagickImageCoderSignature);
 244 }
 245 \f
 246 /*
 247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 248 %                                                                             %
 249 %                                                                             %
 250 %                                                                             %
 251 %   U n r e g i s t e r L A B E L I m a g e                                   %
 252 %                                                                             %
 253 %                                                                             %
 254 %                                                                             %
 255 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 256 %
 257 %  UnregisterLABELImage() removes format registrations made by the
 258 %  LABEL module from the list of supported formats.
 259 %
 260 %  The format of the UnregisterLABELImage method is:
 261 %
 262 %      UnregisterLABELImage(void)
 263 %
 264 */
 265 ModuleExport void UnregisterLABELImage(void)
 266 {
 267   (void) UnregisterMagickInfo("LABEL");
 268 }