granicus.if.org Git - imagemagick/blob - coders/pango.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                     PPPP    AAA   N   N   GGGG   OOO                        %
   7 %                     P   P  A   A  NN  N  G      O   O                       %
   8 %                     PPPP   AAAAA  N N N  G GGG  O   O                       %
   9 %                     P   M  A   A  N  NN  G   G  O   O                       %
  10 %                     P      A   A  N   N   GGGG   OOO                        %
  11 %                                                                             %
  12 %                                                                             %
  13 %                     Read Pango Markup Language Format                       %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                                 March 2012                                  %
  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/composite-private.h"
  48 #include "MagickCore/draw.h"
  49 #include "MagickCore/draw-private.h"
  50 #include "MagickCore/exception.h"
  51 #include "MagickCore/exception-private.h"
  52 #include "MagickCore/image.h"
  53 #include "MagickCore/image-private.h"
  54 #include "MagickCore/list.h"
  55 #include "MagickCore/magick.h"
  56 #include "MagickCore/memory_.h"
  57 #include "MagickCore/module.h"
  58 #include "MagickCore/monitor.h"
  59 #include "MagickCore/monitor-private.h"
  60 #include "MagickCore/option.h"
  61 #include "MagickCore/pixel-accessor.h"
  62 #include "MagickCore/property.h"
  63 #include "MagickCore/quantum-private.h"
  64 #include "MagickCore/static.h"
  65 #include "MagickCore/string_.h"
  66 #include "MagickCore/string-private.h"
  67 #include "MagickCore/token.h"
  68 #include "MagickCore/utility.h"
  69 #if defined(MAGICKCORE_PANGOCAIRO_DELEGATE)
  70 #include <pango/pango.h>
  71 #include <pango/pangocairo.h>
  72 #include <pango/pango-features.h>
  73 #endif
  74 \f
  75 #if defined(MAGICKCORE_PANGOCAIRO_DELEGATE)
  76 /*
  77 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  78 %                                                                             %
  79 %                                                                             %
  80 %                                                                             %
  81 %   R e a d P A N G O I m a g e                                               %
  82 %                                                                             %
  83 %                                                                             %
  84 %                                                                             %
  85 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  86 %
  87 %  ReadPANGOImage() reads an image in the Pango Markup Language Format.
  88 %
  89 %  The format of the ReadPANGOImage method is:
  90 %
  91 %      Image *ReadPANGOImage(const ImageInfo *image_info,
  92 %        ExceptionInfo *exception)
  93 %
  94 %  A description of each parameter follows:
  95 %
  96 %    o image_info: the image info.
  97 %
  98 %    o exception: return any errors or warnings in this structure.
  99 %
 100 */
 101 static Image *ReadPANGOImage(const ImageInfo *image_info,
 102   ExceptionInfo *exception)
 103 {
 104   cairo_font_options_t
 105     *font_options;
 106
 107   cairo_surface_t
 108     *surface;
 109
 110   char
 111     *caption,
 112     *property;
 113
 114   cairo_t
 115     *cairo_image;
 116
 117   const char
 118     *option;
 119
 120   DrawInfo
 121     *draw_info;
 122
 123   Image
 124     *image;
 125
 126   MagickBooleanType
 127     status;
 128
 129   MemoryInfo
 130     *pixel_info;
 131
 132   PangoAlignment
 133     align;
 134
 135   PangoContext
 136     *context;
 137
 138   PangoFontMap
 139     *fontmap;
 140
 141   PangoGravity
 142     gravity;
 143
 144   PangoLayout
 145     *layout;
 146
 147   PangoRectangle
 148     extent;
 149
 150   PixelInfo
 151     fill_color;
 152
 153   RectangleInfo
 154     page;
 155
 156   register unsigned char
 157     *p;
 158
 159   size_t
 160     stride;
 161
 162   ssize_t
 163     y;
 164
 165   unsigned char
 166     *pixels;
 167
 168   /*
 169     Initialize Image structure.
 170   */
 171   assert(image_info != (const ImageInfo *) NULL);
 172   assert(image_info->signature == MagickSignature);
 173   if (image_info->debug != MagickFalse)
 174     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 175       image_info->filename);
 176   assert(exception != (ExceptionInfo *) NULL);
 177   assert(exception->signature == MagickSignature);
 178   image=AcquireImage(image_info,exception);
 179   (void) ResetImagePage(image,"0x0+0+0");
 180   /*
 181     Format caption.
 182   */
 183   option=GetImageOption(image_info,"filename");
 184   if (option == (const char *) NULL)
 185     property=InterpretImageProperties((ImageInfo *) image_info,image,
 186       image_info->filename,exception);
 187   else
 188     if (LocaleNCompare(option,"pango:",6) == 0)
 189       property=InterpretImageProperties((ImageInfo *) image_info,image,option+6,
 190         exception);
 191     else
 192       property=InterpretImageProperties((ImageInfo *) image_info,image,option,
 193         exception);
 194   (void) SetImageProperty(image,"caption",property,exception);
 195   property=DestroyString(property);
 196   caption=ConstantString(GetImageProperty(image,"caption",exception));
 197   /*
 198     Get context.
 199   */
 200   fontmap=pango_cairo_font_map_new();
 201   pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(fontmap),
 202     image->resolution.x == 0.0 ? 90.0 : image->resolution.x);
 203   font_options=cairo_font_options_create();
 204   option=GetImageOption(image_info,"pango:hinting");
 205   if (option != (const char *) NULL)
 206     {
 207       if (LocaleCompare(option,"none") != 0)
 208         cairo_font_options_set_hint_style(font_options,CAIRO_HINT_STYLE_NONE);
 209       if (LocaleCompare(option,"full") != 0)
 210         cairo_font_options_set_hint_style(font_options,CAIRO_HINT_STYLE_FULL);
 211     }
 212   context=pango_font_map_create_context(fontmap);
 213   pango_cairo_context_set_font_options(context,font_options);
 214   cairo_font_options_destroy(font_options);
 215   option=GetImageOption(image_info,"pango:language");
 216   if (option != (const char *) NULL)
 217     pango_context_set_language(context,pango_language_from_string(option));
 218   draw_info=CloneDrawInfo(image_info,(DrawInfo *) NULL);
 219   pango_context_set_base_dir(context,draw_info->direction ==
 220     RightToLeftDirection ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR);
 221   switch (draw_info->gravity)
 222   {
 223     case NorthGravity:
 224     {
 225       gravity=PANGO_GRAVITY_NORTH;
 226       break;
 227     }
 228     case NorthWestGravity:
 229     case WestGravity:
 230     case SouthWestGravity:
 231     {
 232       gravity=PANGO_GRAVITY_WEST;
 233       break;
 234     }
 235     case NorthEastGravity:
 236     case EastGravity:
 237     case SouthEastGravity:
 238     {
 239       gravity=PANGO_GRAVITY_EAST;
 240       break;
 241     }
 242     case SouthGravity:
 243     {
 244       gravity=PANGO_GRAVITY_SOUTH;
 245       break;
 246     }
 247     default:
 248     {
 249       gravity=PANGO_GRAVITY_AUTO;
 250       break;
 251     }
 252   }
 253   pango_context_set_base_gravity(context,gravity);
 254   option=GetImageOption(image_info,"pango:gravity-hint");
 255   if (option != (const char *) NULL)
 256     {
 257       if (LocaleCompare(option,"line") == 0)
 258         pango_context_set_gravity_hint(context,PANGO_GRAVITY_HINT_LINE);
 259       if (LocaleCompare(option,"natural") == 0)
 260         pango_context_set_gravity_hint(context,PANGO_GRAVITY_HINT_NATURAL);
 261       if (LocaleCompare(option,"strong") == 0)
 262         pango_context_set_gravity_hint(context,PANGO_GRAVITY_HINT_STRONG);
 263     }
 264   /*
 265     Configure layout.
 266   */
 267   layout=pango_layout_new(context);
 268   option=GetImageOption(image_info,"pango:auto-dir");
 269   if (option != (const char *) NULL)
 270     pango_layout_set_auto_dir(layout,1);
 271   option=GetImageOption(image_info,"pango:ellipsize");
 272   if (option != (const char *) NULL)
 273     {
 274       if (LocaleCompare(option,"end") == 0)
 275         pango_layout_set_ellipsize(layout,PANGO_ELLIPSIZE_END);
 276       if (LocaleCompare(option,"middle") == 0)
 277         pango_layout_set_ellipsize(layout,PANGO_ELLIPSIZE_MIDDLE);
 278       if (LocaleCompare(option,"none") == 0)
 279         pango_layout_set_ellipsize(layout,PANGO_ELLIPSIZE_NONE);
 280       if (LocaleCompare(option,"start") == 0)
 281         pango_layout_set_ellipsize(layout,PANGO_ELLIPSIZE_START);
 282     }
 283   option=GetImageOption(image_info,"pango:justify");
 284   if (IfMagickTrue(IsStringTrue(option)))
 285     pango_layout_set_justify(layout,1);
 286   option=GetImageOption(image_info,"pango:single-paragraph");
 287   if (IfMagickTrue(IsStringTrue(option)))
 288     pango_layout_set_single_paragraph_mode(layout,1);
 289   option=GetImageOption(image_info,"pango:wrap");
 290   if (option != (const char *) NULL)
 291     {
 292       if (LocaleCompare(option,"char") == 0)
 293         pango_layout_set_wrap(layout,PANGO_WRAP_CHAR);
 294       if (LocaleCompare(option,"word") == 0)
 295         pango_layout_set_wrap(layout,PANGO_WRAP_WORD);
 296       if (LocaleCompare(option,"word-char") == 0)
 297         pango_layout_set_wrap(layout,PANGO_WRAP_WORD_CHAR);
 298     }
 299   option=GetImageOption(image_info,"pango:indent");
 300   if (option != (const char *) NULL)
 301     pango_layout_set_indent(layout,(int) ((StringToLong(option)*
 302       (image->resolution.x == 0.0 ? 90.0 : image->resolution.x)*PANGO_SCALE+36)/
 303       90.0+0.5));
 304   switch (draw_info->align)
 305   {
 306     case CenterAlign: align=PANGO_ALIGN_CENTER; break;
 307     case RightAlign: align=PANGO_ALIGN_RIGHT; break;
 308     case LeftAlign: align=PANGO_ALIGN_LEFT; break;
 309     default:
 310     {
 311       if (draw_info->gravity == CenterGravity)
 312         {
 313           align=PANGO_ALIGN_CENTER;
 314           break;
 315         }
 316       align=PANGO_ALIGN_LEFT;
 317       break;
 318     }
 319   }
 320   if ((align != PANGO_ALIGN_CENTER) &&
 321       (draw_info->direction == RightToLeftDirection))
 322     align=(PangoAlignment) (PANGO_ALIGN_LEFT+PANGO_ALIGN_RIGHT-align);
 323   pango_layout_set_alignment(layout,align);
 324   if (draw_info->font != (char *) NULL)
 325     {
 326       PangoFontDescription
 327         *description;
 328
 329       /*
 330         Set font.
 331       */
 332       description=pango_font_description_from_string(draw_info->font);
 333       pango_font_description_set_size(description,(int) (PANGO_SCALE*
 334         draw_info->pointsize+0.5));
 335       pango_layout_set_font_description(layout,description);
 336       pango_font_description_free(description);
 337     }
 338   option=GetImageOption(image_info,"pango:markup");
 339   if ((option != (const char *) NULL) && (IsStringTrue(option) == MagickFalse))
 340     pango_layout_set_text(layout,caption,-1);
 341   else
 342     {
 343       GError
 344         *error;
 345
 346       error=(GError *) NULL;
 347       if (pango_parse_markup(caption,-1,0,NULL,NULL,NULL,&error) == 0)
 348         (void) ThrowMagickException(exception,GetMagickModule(),CoderError,
 349           error->message,"`%s'",image_info->filename);
 350       pango_layout_set_markup(layout,caption,-1);
 351     }
 352   pango_layout_context_changed(layout);
 353   page.x=0;
 354   page.y=0;
 355   if (image_info->page != (char *) NULL)
 356     (void) ParseAbsoluteGeometry(image_info->page,&page);
 357   if (image->columns == 0)
 358     {
 359       pango_layout_get_extents(layout,NULL,&extent);
 360       image->columns=(extent.x+extent.width+PANGO_SCALE/2)/PANGO_SCALE+2*page.x;
 361     }
 362   else
 363     {
 364       image->columns-=2*page.x;
 365       pango_layout_set_width(layout,(int) ((PANGO_SCALE*image->columns*
 366         (image->resolution.x == 0.0 ? 90.0 : image->resolution.x)+45.0)/90.0+
 367         0.5));
 368     }
 369   if (image->rows == 0)
 370     {
 371       pango_layout_get_extents(layout,NULL,&extent);
 372       image->rows=(extent.y+extent.height+PANGO_SCALE/2)/PANGO_SCALE+2*page.y;
 373     }
 374   else
 375     {
 376       image->rows-=2*page.y;
 377       pango_layout_set_height(layout,(int) ((PANGO_SCALE*image->rows*
 378         (image->resolution.y == 0.0 ? 90.0 : image->resolution.y)+45.0)/90.0+
 379         0.5));
 380     }
 381   /*
 382     Render markup.
 383   */
 384   stride=(size_t) cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32,
 385     (int) image->columns);
 386   pixel_info=AcquireVirtualMemory(image->rows,stride*sizeof(*pixels));
 387   if (pixel_info == (MemoryInfo *) NULL)
 388     {
 389       draw_info=DestroyDrawInfo(draw_info);
 390       caption=DestroyString(caption);
 391       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 392     }
 393   pixels=(unsigned char *) GetVirtualMemoryBlob(pixel_info);
 394   surface=cairo_image_surface_create_for_data(pixels,CAIRO_FORMAT_ARGB32,
 395     (int) image->columns,(int) image->rows,(int) stride);
 396   cairo_image=cairo_create(surface);
 397   cairo_set_operator(cairo_image,CAIRO_OPERATOR_CLEAR);
 398   cairo_paint(cairo_image);
 399   cairo_set_operator(cairo_image,CAIRO_OPERATOR_OVER);
 400   cairo_translate(cairo_image,page.x,page.y);
 401   pango_cairo_show_layout(cairo_image,layout);
 402   cairo_destroy(cairo_image);
 403   cairo_surface_destroy(surface);
 404   g_object_unref(layout);
 405   g_object_unref(fontmap);
 406   /*
 407     Convert surface to image.
 408   */
 409   (void) SetImageBackgroundColor(image,exception);
 410   p=pixels;
 411   GetPixelInfo(image,&fill_color);
 412   for (y=0; y < (ssize_t) image->rows; y++)
 413   {
 414     register Quantum
 415       *q;
 416
 417     register ssize_t
 418       x;
 419
 420     q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
 421     if (q == (Quantum *) NULL)
 422       break;
 423     for (x=0; x < (ssize_t) image->columns; x++)
 424     {
 425       double
 426         gamma;
 427
 428       fill_color.blue=(double) ScaleCharToQuantum(*p++);
 429       fill_color.green=(double) ScaleCharToQuantum(*p++);
 430       fill_color.red=(double) ScaleCharToQuantum(*p++);
 431       fill_color.alpha=(double) ScaleCharToQuantum(*p++);
 432       /*
 433         Disassociate alpha.
 434       */
 435       gamma=1.0-QuantumScale*fill_color.alpha;
 436       gamma=PerceptibleReciprocal(gamma);
 437       fill_color.blue*=gamma;
 438       fill_color.green*=gamma;
 439       fill_color.red*=gamma;
 440       CompositePixelOver(image,&fill_color,fill_color.alpha,q,(double)
 441         GetPixelAlpha(image,q),q);
 442       q+=GetPixelChannels(image);
 443     }
 444     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 445       break;
 446     if (image->previous == (Image *) NULL)
 447       {
 448         status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 449         image->rows);
 450         if (status == MagickFalse)
 451           break;
 452       }
 453   }
 454   /*
 455     Relinquish resources.
 456   */
 457   pixel_info=RelinquishVirtualMemory(pixel_info);
 458   draw_info=DestroyDrawInfo(draw_info);
 459   caption=DestroyString(caption);
 460   return(GetFirstImageInList(image));
 461 }
 462 #endif
 463 \f
 464 /*
 465 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 466 %                                                                             %
 467 %                                                                             %
 468 %                                                                             %
 469 %   R e g i s t e r P A N G O I m a g e                                       %
 470 %                                                                             %
 471 %                                                                             %
 472 %                                                                             %
 473 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 474 %
 475 %  RegisterPANGOImage() adds attributes for the Pango Markup Language format to
 476 %  the list of supported formats.  The attributes include the image format
 477 %  tag, a method to read and/or write the format, whether the format
 478 %  supports the saving of more than one frame to the same file or blob,
 479 %  whether the format supports native in-memory I/O, and a brief
 480 %  description of the format.
 481 %
 482 %  The format of the RegisterPANGOImage method is:
 483 %
 484 %      size_t RegisterPANGOImage(void)
 485 %
 486 */
 487 ModuleExport size_t RegisterPANGOImage(void)
 488 {
 489   char
 490     version[MaxTextExtent];
 491
 492   MagickInfo
 493     *entry;
 494
 495   *version='\0';
 496 #if defined(PANGO_VERSION_STRING)
 497   (void) FormatLocaleString(version,MaxTextExtent,"Pangocairo %s",
 498     PANGO_VERSION_STRING);
 499 #endif
 500   entry=SetMagickInfo("PANGO");
 501 #if defined(MAGICKCORE_PANGOCAIRO_DELEGATE)
 502   entry->decoder=(DecodeImageHandler *) ReadPANGOImage;
 503 #endif
 504   entry->description=ConstantString("Pango Markup Language");
 505   if (*version != '\0')
 506     entry->version=ConstantString(version);
 507   entry->adjoin=MagickFalse;
 508   entry->module=ConstantString("PANGO");
 509   (void) RegisterMagickInfo(entry);
 510   return(MagickImageCoderSignature);
 511 }
 512 \f
 513 /*
 514 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 515 %                                                                             %
 516 %                                                                             %
 517 %                                                                             %
 518 %   U n r e g i s t e r P A N G O I m a g e                                   %
 519 %                                                                             %
 520 %                                                                             %
 521 %                                                                             %
 522 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 523 %
 524 %  UnregisterPANGOImage() removes format registrations made by the Pango module
 525 %  from the list of supported formats.
 526 %
 527 %  The format of the UnregisterPANGOImage method is:
 528 %
 529 %      UnregisterPANGOImage(void)
 530 %
 531 */
 532 ModuleExport void UnregisterPANGOImage(void)
 533 {
 534   (void) UnregisterMagickInfo("PANGO");
 535 }