research.m1stereo.tv/gitweb/ - melted/blob - src/modules/gtk2/producer_pango.c

   1 /*
   2  * producer_pango.c -- a pango-based titler
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "producer_pango.h"
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_geometry.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <gdk-pixbuf/gdk-pixbuf.h>
  27 #include <pango/pangoft2.h>
  28 #include <freetype/freetype.h>
  29 #include <iconv.h>
  30
  31 struct producer_pango_s
  32 {
  33         struct mlt_producer_s parent;
  34         int width;
  35         int height;
  36         uint8_t *image;
  37         uint8_t *alpha;
  38         char *fgcolor;
  39         char *bgcolor;
  40         int   align;
  41         int   pad;
  42         char *markup;
  43         char *text;
  44         char *font;
  45         int weight;
  46 };
  47
  48 // special color type used by internal pango routines
  49 typedef struct
  50 {
  51         uint8_t r, g, b, a;
  52 } rgba_color;
  53
  54 // Forward declarations
  55 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  56 static void producer_close( mlt_producer parent );
  57 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
  58 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font,
  59         rgba_color fg, rgba_color bg, int pad, int align, int weight, int size );
  60
  61 /** Return nonzero if the two strings are equal, ignoring case, up to
  62     the first n characters.
  63 */
  64 int strncaseeq(const char *s1, const char *s2, size_t n)
  65 {
  66         for ( ; n > 0; n--)
  67         {
  68                 if (tolower(*s1++) != tolower(*s2++))
  69                         return 0;
  70         }
  71         return 1;
  72 }
  73
  74 /** Parse the alignment property.
  75 */
  76
  77 static int alignment_parse( char* align )
  78 {
  79         int ret = pango_align_left;
  80
  81         if ( align == NULL );
  82         else if ( isdigit( align[ 0 ] ) )
  83                 ret = atoi( align );
  84         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  85                 ret = pango_align_center;
  86         else if ( align[ 0 ] == 'r' )
  87                 ret = pango_align_right;
  88
  89         return ret;
  90 }
  91
  92 static PangoFT2FontMap *fontmap = NULL;
  93
  94 mlt_producer producer_pango_init( const char *filename )
  95 {
  96         producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
  97         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  98         {
  99                 mlt_producer producer = &this->parent;
 100
 101                 // THIS SHOULD BE MUTEXED...
 102                 if ( fontmap == NULL )
 103                         fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
 104
 105                 producer->get_frame = producer_get_frame;
 106                 producer->close = ( mlt_destructor )producer_close;
 107
 108                 // This is required to initialise gdk-pixbuf
 109                 g_type_init();
 110
 111                 // Get the properties interface
 112                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &this->parent );
 113
 114                 // Set the default properties
 115                 mlt_properties_set( properties, "fgcolour", "0xffffffff" );
 116                 mlt_properties_set( properties, "bgcolour", "0x00000000" );
 117                 mlt_properties_set_int( properties, "align", pango_align_left );
 118                 mlt_properties_set_int( properties, "pad", 0 );
 119                 mlt_properties_set( properties, "text", "" );
 120                 mlt_properties_set( properties, "font", "Sans 48" );
 121                 mlt_properties_set( properties, "encoding", "UTF-8" );
 122                 mlt_properties_set_int( properties, "weight", PANGO_WEIGHT_NORMAL );
 123
 124                 if ( filename == NULL )
 125                 {
 126                         mlt_properties_set( properties, "markup", "" );
 127                 }
 128                 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
 129                 {
 130                         char *copy = strdup( filename + 1 );
 131                         char *markup = copy;
 132                         if ( strstr( markup, "/+" ) )
 133                                 markup = strstr( markup, "/+" ) + 2;
 134                         ( *strrchr( markup, '.' ) ) = '\0';
 135                         while ( strchr( markup, '~' ) )
 136                                 ( *strchr( markup, '~' ) ) = '\n';
 137                         mlt_properties_set( properties, "resource", ( char * )filename );
 138                         mlt_properties_set( properties, "markup", markup );
 139                         free( copy );
 140                 }
 141                 else if ( strstr( filename, ".mpl" ) )
 142                 {
 143                         int i = 0;
 144                         mlt_properties contents = mlt_properties_load( filename );
 145                         mlt_geometry key_frames = mlt_geometry_init( );
 146                         struct mlt_geometry_item_s item;
 147                         mlt_properties_set_data( properties, "contents", contents, 0, ( mlt_destructor )mlt_properties_close, NULL );
 148                         mlt_properties_set_data( properties, "key_frames", key_frames, 0, ( mlt_destructor )mlt_geometry_close, NULL );
 149
 150                         // Make sure we have at least one entry
 151                         if ( mlt_properties_get( contents, "0" ) == NULL )
 152                                 mlt_properties_set( contents, "0", "" );
 153
 154                         for ( i = 0; i < mlt_properties_count( contents ); i ++ )
 155                         {
 156                                 char *name = mlt_properties_get_name( contents, i );
 157                                 char *value = mlt_properties_get_value( contents, i );
 158                                 while ( value != NULL && strchr( value, '~' ) )
 159                                         ( *strchr( value, '~' ) ) = '\n';
 160                                 item.frame = atoi( name );
 161                                 mlt_geometry_insert( key_frames, &item );
 162                         }
 163                 }
 164                 else
 165                 {
 166                         FILE *f = fopen( filename, "r" );
 167                         if ( f != NULL )
 168                         {
 169                                 char line[81];
 170                                 char *markup = NULL;
 171                                 size_t size = 0;
 172                                 line[80] = '\0';
 173
 174                                 while ( fgets( line, 80, f ) )
 175                                 {
 176                                         size += strlen( line ) + 1;
 177                                         if ( markup )
 178                                         {
 179                                                 markup = realloc( markup, size );
 180                                                 strcat( markup, line );
 181                                         }
 182                                         else
 183                                         {
 184                                                 markup = strdup( line );
 185                                         }
 186                                 }
 187                                 fclose( f );
 188
 189                                 if ( markup[ strlen( markup ) - 1 ] == '\n' )
 190                                         markup[ strlen( markup ) - 1 ] = '\0';
 191
 192                                 mlt_properties_set( properties, "resource", ( char * ) filename );
 193                                 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
 194                                 free( markup );
 195                         }
 196                         else
 197                         {
 198                                 mlt_properties_set( properties, "markup", "" );
 199                         }
 200                 }
 201
 202                 return producer;
 203         }
 204         free( this );
 205         return NULL;
 206 }
 207
 208 static void set_string( char **string, char *value, char *fallback )
 209 {
 210         if ( value != NULL )
 211         {
 212                 free( *string );
 213                 *string = strdup( value );
 214         }
 215         else if ( *string == NULL && fallback != NULL )
 216         {
 217                 *string = strdup( fallback );
 218         }
 219         else if ( *string != NULL && fallback == NULL )
 220         {
 221                 free( *string );
 222                 *string = NULL;
 223         }
 224 }
 225
 226 rgba_color parse_color( char *color )
 227 {
 228         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
 229
 230         if ( !strncmp( color, "0x", 2 ) )
 231         {
 232                 unsigned int temp = 0;
 233                 sscanf( color + 2, "%x", &temp );
 234                 result.r = ( temp >> 24 ) & 0xff;
 235                 result.g = ( temp >> 16 ) & 0xff;
 236                 result.b = ( temp >> 8 ) & 0xff;
 237                 result.a = ( temp ) & 0xff;
 238         }
 239         else if ( !strcmp( color, "red" ) )
 240         {
 241                 result.r = 0xff;
 242                 result.g = 0x00;
 243                 result.b = 0x00;
 244         }
 245         else if ( !strcmp( color, "green" ) )
 246         {
 247                 result.r = 0x00;
 248                 result.g = 0xff;
 249                 result.b = 0x00;
 250         }
 251         else if ( !strcmp( color, "blue" ) )
 252         {
 253                 result.r = 0x00;
 254                 result.g = 0x00;
 255                 result.b = 0xff;
 256         }
 257         else
 258         {
 259                 unsigned int temp = 0;
 260                 sscanf( color, "%d", &temp );
 261                 result.r = ( temp >> 24 ) & 0xff;
 262                 result.g = ( temp >> 16 ) & 0xff;
 263                 result.b = ( temp >> 8 ) & 0xff;
 264                 result.a = ( temp ) & 0xff;
 265         }
 266
 267         return result;
 268 }
 269
 270 /** Convert a string property to UTF-8
 271 */
 272 static int iconv_utf8( mlt_properties properties, char *prop_name, const char* encoding )
 273 {
 274         char *text = mlt_properties_get( properties, prop_name );
 275         int result = -1;
 276
 277         iconv_t cd = iconv_open( "UTF-8", encoding );
 278         if ( cd != ( iconv_t )-1 )
 279         {
 280                 char *inbuf_p = text;
 281                 size_t inbuf_n = strlen( text );
 282                 size_t outbuf_n = inbuf_n * 6;
 283                 char *outbuf = mlt_pool_alloc( outbuf_n );
 284                 char *outbuf_p = outbuf;
 285
 286                 memset( outbuf, 0, outbuf_n );
 287
 288                 if ( text != NULL && strcmp( text, "" ) && iconv( cd, &inbuf_p, &inbuf_n, &outbuf_p, &outbuf_n ) != -1 )
 289                         mlt_properties_set( properties, prop_name, outbuf );
 290                 else
 291                         mlt_properties_set( properties, prop_name, "" );
 292
 293                 mlt_pool_release( outbuf );
 294                 iconv_close( cd );
 295                 result = 0;
 296         }
 297         return result;
 298 }
 299
 300 static void refresh_image( mlt_frame frame, int width, int height )
 301 {
 302         // Pixbuf
 303         GdkPixbuf *pixbuf = NULL;
 304
 305         // Obtain properties of frame
 306         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 307
 308         // Obtain the producer pango for this frame
 309         producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
 310
 311         // Obtain the producer
 312         mlt_producer producer = &this->parent;
 313
 314         // Obtain the producer properties
 315         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 316
 317         // Get producer properties
 318         char *fg = mlt_properties_get( producer_props, "fgcolour" );
 319         char *bg = mlt_properties_get( producer_props, "bgcolour" );
 320         int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
 321         int pad = mlt_properties_get_int( producer_props, "pad" );
 322         char *markup = mlt_properties_get( producer_props, "markup" );
 323         char *text = mlt_properties_get( producer_props, "text" );
 324         char *font = mlt_properties_get( producer_props, "font" );
 325         char *encoding = mlt_properties_get( producer_props, "encoding" );
 326         int weight = mlt_properties_get_int( producer_props, "weight" );
 327         int size = mlt_properties_get_int( producer_props, "size" );
 328         int property_changed = ( align != this->align );
 329
 330         // Check for file support
 331         int position = mlt_properties_get_position( properties, "pango_position" );
 332         mlt_properties contents = mlt_properties_get_data( producer_props, "contents", NULL );
 333         mlt_geometry key_frames = mlt_properties_get_data( producer_props, "key_frames", NULL );
 334         struct mlt_geometry_item_s item;
 335         if ( contents != NULL )
 336         {
 337                 char temp[ 20 ];
 338                 mlt_geometry_prev_key( key_frames, &item, position );
 339                 sprintf( temp, "%d", item.frame );
 340                 markup = mlt_properties_get( contents, temp );
 341         }
 342
 343         // See if any properties changed
 344         property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
 345         property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
 346         property_changed = property_changed || ( pad != this->pad );
 347         property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
 348         property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
 349         property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
 350         property_changed = property_changed || ( weight != this->weight );
 351
 352         // Save the properties for next comparison
 353         this->align = align;
 354         this->pad = pad;
 355         set_string( &this->fgcolor, fg, "0xffffffff" );
 356         set_string( &this->bgcolor, bg, "0x00000000" );
 357         set_string( &this->markup, markup, NULL );
 358         set_string( &this->text, text, NULL );
 359         set_string( &this->font, font, "Sans 48" );
 360         this->weight = weight;
 361
 362         if ( property_changed )
 363         {
 364                 rgba_color fgcolor = parse_color( this->fgcolor );
 365                 rgba_color bgcolor = parse_color( this->bgcolor );
 366
 367                 mlt_pool_release( this->image );
 368                 mlt_pool_release( this->alpha );
 369                 this->image = NULL;
 370                 this->alpha = NULL;
 371
 372                 // Convert from specified encoding to UTF-8
 373                 if ( encoding != NULL && !strncaseeq( encoding, "utf-8", 5 ) && !strncaseeq( encoding, "utf8", 4 ) )
 374                 {
 375                         if ( markup != NULL && iconv_utf8( producer_props, "markup", encoding ) != -1 )
 376                         {
 377                                 markup = mlt_properties_get( producer_props, "markup" );
 378                                 set_string( &this->markup, markup, NULL );
 379                         }
 380                         if ( text != NULL && iconv_utf8( producer_props, "text", encoding ) != -1 )
 381                         {
 382                                 text = mlt_properties_get( producer_props, "text" );
 383                                 set_string( &this->text, text, NULL );
 384                         }
 385                 }
 386
 387                 // Render the title
 388                 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align, weight, size );
 389
 390                 if ( pixbuf != NULL )
 391                 {
 392                         // Register this pixbuf for destruction and reuse
 393                         mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
 394
 395                         mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
 396                         mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
 397
 398                         // Store the width/height of the pixbuf temporarily
 399                         this->width = gdk_pixbuf_get_width( pixbuf );
 400                         this->height = gdk_pixbuf_get_height( pixbuf );
 401                 }
 402         }
 403         else if ( width > 0 && ( this->image == NULL || width != this->width || height != this->height ) )
 404         {
 405                 mlt_pool_release( this->image );
 406                 mlt_pool_release( this->alpha );
 407                 this->image = NULL;
 408                 this->alpha = NULL;
 409
 410                 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
 411         }
 412
 413         // If we have a pixbuf and a valid width
 414         if ( pixbuf && width > 0 )
 415         {
 416                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 417                 int interp = GDK_INTERP_BILINEAR;
 418
 419                 if ( strcmp( interps, "nearest" ) == 0 )
 420                         interp = GDK_INTERP_NEAREST;
 421                 else if ( strcmp( interps, "tiles" ) == 0 )
 422                         interp = GDK_INTERP_TILES;
 423                 else if ( strcmp( interps, "hyper" ) == 0 )
 424                         interp = GDK_INTERP_HYPER;
 425
 426 //              fprintf( stderr, "SCALING PANGO from %dx%d to %dx%d was %dx%d\n", gdk_pixbuf_get_width( pixbuf ), gdk_pixbuf_get_height( pixbuf ), width, height, this->width, this->height );
 427
 428                 // Note - the original pixbuf is already safe and ready for destruction
 429                 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
 430
 431                 // Store width and height
 432                 this->width = width;
 433                 this->height = height;
 434
 435                 // Allocate/define image
 436                 this->image = mlt_pool_alloc( width * ( height + 1 ) * 2 );
 437                 this->alpha = mlt_pool_alloc( this->width * this->height );
 438
 439                 // Convert the image
 440                 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 441                                                                           this->width, this->height,
 442                                                                           gdk_pixbuf_get_rowstride( pixbuf ),
 443                                                                           this->image, this->alpha );
 444
 445                 // Finished with pixbuf now
 446                 g_object_unref( pixbuf );
 447         }
 448
 449         // Set width/height
 450         mlt_properties_set_int( properties, "width", this->width );
 451         mlt_properties_set_int( properties, "height", this->height );
 452         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
 453         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
 454
 455         // pass the image data without destructor
 456         mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * 2, NULL, NULL );
 457         mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
 458 }
 459
 460 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 461 {
 462         // Obtain properties of frame
 463         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 464
 465         // We need to know the size of the image to clone it
 466         int image_size = 0;
 467         int alpha_size = 0;
 468
 469         // Alpha channel
 470         uint8_t *alpha = NULL;
 471
 472         *width = mlt_properties_get_int( properties, "rescale_width" );
 473         *height = mlt_properties_get_int( properties, "rescale_height" );
 474
 475         // Refresh the image
 476         refresh_image( frame, *width, *height );
 477
 478         // Get the image
 479         *buffer = mlt_properties_get_data( properties, "image", &image_size );
 480         alpha = mlt_properties_get_data( properties, "alpha", &alpha_size );
 481
 482         // Get width and height
 483         *width = mlt_properties_get_int( properties, "width" );
 484         *height = mlt_properties_get_int( properties, "height" );
 485
 486         // Always clone here to allow 'animated' text
 487         if ( *buffer != NULL )
 488         {
 489                 // Clone the image and the alpha
 490                 uint8_t *image_copy = mlt_pool_alloc( image_size );
 491                 uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 492
 493                 memcpy( image_copy, *buffer, image_size );
 494
 495                 // Copy or default the alpha
 496                 if ( alpha != NULL )
 497                         memcpy( alpha_copy, alpha, alpha_size );
 498                 else
 499                         memset( alpha_copy, 255, alpha_size );
 500
 501                 // Now update properties so we free the copy after
 502                 mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 503                 mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 504
 505                 // We're going to pass the copy on
 506                 *buffer = image_copy;
 507         }
 508         else
 509         {
 510                 // TODO: Review all cases of invalid images
 511                 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
 512                 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
 513                 *width = 50;
 514                 *height = 50;
 515         }
 516
 517         return 0;
 518 }
 519
 520 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 521 {
 522         // Obtain properties of frame
 523         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 524
 525         // Return the alpha mask
 526         return mlt_properties_get_data( properties, "alpha", NULL );
 527 }
 528
 529 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 530 {
 531         producer_pango this = producer->child;
 532
 533         // Generate a frame
 534         *frame = mlt_frame_init( );
 535
 536         // Obtain properties of frame and producer
 537         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 538
 539         // Set the producer on the frame properties
 540         mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
 541
 542         // Update timecode on the frame we're creating
 543         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 544         mlt_properties_set_position( properties, "pango_position", mlt_producer_frame( producer ) );
 545
 546         // Refresh the pango image
 547         refresh_image( *frame, 0, 0 );
 548
 549         // Set producer-specific frame properties
 550         mlt_properties_set_int( properties, "progressive", 1 );
 551         mlt_properties_set_double( properties, "aspect_ratio", 0 );
 552
 553         // Set alpha call back
 554         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 555
 556         // Stack the get image callback
 557         mlt_frame_push_get_image( *frame, producer_get_image );
 558
 559         // Calculate the next timecode
 560         mlt_producer_prepare_next( producer );
 561
 562         return 0;
 563 }
 564
 565 static void producer_close( mlt_producer parent )
 566 {
 567         producer_pango this = parent->child;
 568         mlt_pool_release( this->image );
 569         mlt_pool_release( this->alpha );
 570         free( this->fgcolor );
 571         free( this->bgcolor );
 572         free( this->markup );
 573         free( this->text );
 574         free( this->font );
 575         parent->close = NULL;
 576         mlt_producer_close( parent );
 577         free( this );
 578 }
 579
 580 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
 581 {
 582         int ww = gdk_pixbuf_get_width( pixbuf );
 583         int hh = gdk_pixbuf_get_height( pixbuf );
 584         uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
 585         int i, j;
 586
 587         for ( j = 0; j < hh; j++ )
 588         {
 589                 for ( i = 0; i < ww; i++ )
 590                 {
 591                         *p++ = bg.r;
 592                         *p++ = bg.g;
 593                         *p++ = bg.b;
 594                         *p++ = bg.a;
 595                 }
 596         }
 597 }
 598
 599 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align, int weight, int size )
 600 {
 601         PangoContext *context = pango_ft2_font_map_create_context( fontmap );
 602         PangoLayout *layout = pango_layout_new( context );
 603         int w, h, x;
 604         int i, j;
 605         GdkPixbuf *pixbuf = NULL;
 606         FT_Bitmap bitmap;
 607         uint8_t *src = NULL;
 608         uint8_t* dest = NULL;
 609         uint8_t *d, *s, a;
 610         int stride;
 611         PangoFontDescription *desc = pango_font_description_from_string( font );
 612
 613         pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
 614         pango_layout_set_width( layout, -1 ); // set wrapping constraints
 615         pango_font_description_set_weight( desc, ( PangoWeight ) weight  );
 616         if ( size != 0 )
 617                 pango_font_description_set_size( desc, PANGO_SCALE * size );
 618         pango_layout_set_font_description( layout, desc );
 619 //      pango_layout_set_spacing( layout, space );
 620         pango_layout_set_alignment( layout, ( PangoAlignment ) align  );
 621         if ( markup != NULL && strcmp( markup, "" ) != 0 )
 622                 pango_layout_set_markup( layout, markup, strlen( markup ) );
 623         else if ( text != NULL && strcmp( text, "" ) != 0 )
 624                 pango_layout_set_text( layout, text, strlen( text ) );
 625         else
 626                 pango_layout_set_text( layout, "  ", 2 );
 627         pango_layout_get_pixel_size( layout, &w, &h );
 628
 629         pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
 630         pango_draw_background( pixbuf, bg );
 631
 632         stride = gdk_pixbuf_get_rowstride( pixbuf );
 633
 634         bitmap.width     = w;
 635         bitmap.pitch     = 32 * ( ( w + 31 ) / 31 );
 636         bitmap.rows      = h;
 637         bitmap.buffer    = mlt_pool_alloc( h * bitmap.pitch );
 638         bitmap.num_grays = 256;
 639         bitmap.pixel_mode = ft_pixel_mode_grays;
 640
 641         memset( bitmap.buffer, 0, h * bitmap.pitch );
 642
 643         pango_ft2_render_layout( &bitmap, layout, 0, 0 );
 644
 645         src = bitmap.buffer;
 646         x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
 647         dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
 648         j = h;
 649
 650         while( j -- )
 651         {
 652                 d = dest;
 653                 s = src;
 654                 i = w;
 655                 while( i -- )
 656                 {
 657                         a = *s ++;
 658                         *d++ = ( a * fg.r + ( 255 - a ) * bg.r ) >> 8;
 659                         *d++ = ( a * fg.g + ( 255 - a ) * bg.g ) >> 8;
 660                         *d++ = ( a * fg.b + ( 255 - a ) * bg.b ) >> 8;
 661                         *d++ = ( a * fg.a + ( 255 - a ) * bg.a ) >> 8;
 662                 }
 663                 dest += stride;
 664                 src += bitmap.pitch;
 665         }
 666         mlt_pool_release( bitmap.buffer );
 667         pango_font_description_free( desc );
 668         g_object_unref( layout );
 669         g_object_unref( context );
 670
 671         return pixbuf;
 672 }