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 #include <pthread.h>
  31
  32 static pthread_mutex_t pango_mutex = PTHREAD_MUTEX_INITIALIZER;
  33
  34 struct producer_pango_s
  35 {
  36         struct mlt_producer_s parent;
  37         int width;
  38         int height;
  39         uint8_t *image;
  40         uint8_t *alpha;
  41         char *fgcolor;
  42         char *bgcolor;
  43         int   align;
  44         int   pad;
  45         char *markup;
  46         char *text;
  47         char *font;
  48         int weight;
  49 };
  50
  51 // special color type used by internal pango routines
  52 typedef struct
  53 {
  54         uint8_t r, g, b, a;
  55 } rgba_color;
  56
  57 // Forward declarations
  58 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  59 static void producer_close( mlt_producer parent );
  60 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
  61 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font,
  62         rgba_color fg, rgba_color bg, int pad, int align, int weight, int size );
  63
  64 /** Return nonzero if the two strings are equal, ignoring case, up to
  65     the first n characters.
  66 */
  67 int strncaseeq(const char *s1, const char *s2, size_t n)
  68 {
  69         for ( ; n > 0; n--)
  70         {
  71                 if (tolower(*s1++) != tolower(*s2++))
  72                         return 0;
  73         }
  74         return 1;
  75 }
  76
  77 /** Parse the alignment property.
  78 */
  79
  80 static int alignment_parse( char* align )
  81 {
  82         int ret = pango_align_left;
  83
  84         if ( align == NULL );
  85         else if ( isdigit( align[ 0 ] ) )
  86                 ret = atoi( align );
  87         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  88                 ret = pango_align_center;
  89         else if ( align[ 0 ] == 'r' )
  90                 ret = pango_align_right;
  91
  92         return ret;
  93 }
  94
  95 static PangoFT2FontMap *fontmap = NULL;
  96
  97 mlt_producer producer_pango_init( const char *filename )
  98 {
  99         producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
 100         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
 101         {
 102                 mlt_producer producer = &this->parent;
 103
 104                 pthread_mutex_lock( &pango_mutex );
 105                 if ( fontmap == NULL )
 106                         fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
 107                 g_type_init();
 108                 pthread_mutex_unlock( &pango_mutex );
 109
 110                 producer->get_frame = producer_get_frame;
 111                 producer->close = ( mlt_destructor )producer_close;
 112
 113                 // Get the properties interface
 114                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &this->parent );
 115
 116                 // Set the default properties
 117                 mlt_properties_set( properties, "fgcolour", "0xffffffff" );
 118                 mlt_properties_set( properties, "bgcolour", "0x00000000" );
 119                 mlt_properties_set_int( properties, "align", pango_align_left );
 120                 mlt_properties_set_int( properties, "pad", 0 );
 121                 mlt_properties_set( properties, "text", "" );
 122                 mlt_properties_set( properties, "font", "Sans 48" );
 123                 mlt_properties_set( properties, "encoding", "UTF-8" );
 124                 mlt_properties_set_int( properties, "weight", PANGO_WEIGHT_NORMAL );
 125
 126                 if ( filename == NULL )
 127                 {
 128                         mlt_properties_set( properties, "markup", "" );
 129                 }
 130                 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
 131                 {
 132                         char *copy = strdup( filename + 1 );
 133                         char *markup = copy;
 134                         if ( strstr( markup, "/+" ) )
 135                                 markup = strstr( markup, "/+" ) + 2;
 136                         ( *strrchr( markup, '.' ) ) = '\0';
 137                         while ( strchr( markup, '~' ) )
 138                                 ( *strchr( markup, '~' ) ) = '\n';
 139                         mlt_properties_set( properties, "resource", ( char * )filename );
 140                         mlt_properties_set( properties, "markup", markup );
 141                         free( copy );
 142                 }
 143                 else if ( strstr( filename, ".mpl" ) )
 144                 {
 145                         int i = 0;
 146                         mlt_properties contents = mlt_properties_load( filename );
 147                         mlt_geometry key_frames = mlt_geometry_init( );
 148                         struct mlt_geometry_item_s item;
 149                         mlt_properties_set_data( properties, "contents", contents, 0, ( mlt_destructor )mlt_properties_close, NULL );
 150                         mlt_properties_set_data( properties, "key_frames", key_frames, 0, ( mlt_destructor )mlt_geometry_close, NULL );
 151
 152                         // Make sure we have at least one entry
 153                         if ( mlt_properties_get( contents, "0" ) == NULL )
 154                                 mlt_properties_set( contents, "0", "" );
 155
 156                         for ( i = 0; i < mlt_properties_count( contents ); i ++ )
 157                         {
 158                                 char *name = mlt_properties_get_name( contents, i );
 159                                 char *value = mlt_properties_get_value( contents, i );
 160                                 while ( value != NULL && strchr( value, '~' ) )
 161                                         ( *strchr( value, '~' ) ) = '\n';
 162                                 item.frame = atoi( name );
 163                                 mlt_geometry_insert( key_frames, &item );
 164                         }
 165                 }
 166                 else
 167                 {
 168                         FILE *f = fopen( filename, "r" );
 169                         if ( f != NULL )
 170                         {
 171                                 char line[81];
 172                                 char *markup = NULL;
 173                                 size_t size = 0;
 174                                 line[80] = '\0';
 175
 176                                 while ( fgets( line, 80, f ) )
 177                                 {
 178                                         size += strlen( line ) + 1;
 179                                         if ( markup )
 180                                         {
 181                                                 markup = realloc( markup, size );
 182                                                 strcat( markup, line );
 183                                         }
 184                                         else
 185                                         {
 186                                                 markup = strdup( line );
 187                                         }
 188                                 }
 189                                 fclose( f );
 190
 191                                 if ( markup[ strlen( markup ) - 1 ] == '\n' )
 192                                         markup[ strlen( markup ) - 1 ] = '\0';
 193
 194                                 mlt_properties_set( properties, "resource", ( char * ) filename );
 195                                 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
 196                                 free( markup );
 197                         }
 198                         else
 199                         {
 200                                 mlt_properties_set( properties, "markup", "" );
 201                         }
 202                 }
 203
 204                 return producer;
 205         }
 206         free( this );
 207         return NULL;
 208 }
 209
 210 static void set_string( char **string, char *value, char *fallback )
 211 {
 212         if ( value != NULL )
 213         {
 214                 free( *string );
 215                 *string = strdup( value );
 216         }
 217         else if ( *string == NULL && fallback != NULL )
 218         {
 219                 *string = strdup( fallback );
 220         }
 221         else if ( *string != NULL && fallback == NULL )
 222         {
 223                 free( *string );
 224                 *string = NULL;
 225         }
 226 }
 227
 228 rgba_color parse_color( char *color )
 229 {
 230         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
 231
 232         if ( !strncmp( color, "0x", 2 ) )
 233         {
 234                 unsigned int temp = 0;
 235                 sscanf( color + 2, "%x", &temp );
 236                 result.r = ( temp >> 24 ) & 0xff;
 237                 result.g = ( temp >> 16 ) & 0xff;
 238                 result.b = ( temp >> 8 ) & 0xff;
 239                 result.a = ( temp ) & 0xff;
 240         }
 241         else if ( !strcmp( color, "red" ) )
 242         {
 243                 result.r = 0xff;
 244                 result.g = 0x00;
 245                 result.b = 0x00;
 246         }
 247         else if ( !strcmp( color, "green" ) )
 248         {
 249                 result.r = 0x00;
 250                 result.g = 0xff;
 251                 result.b = 0x00;
 252         }
 253         else if ( !strcmp( color, "blue" ) )
 254         {
 255                 result.r = 0x00;
 256                 result.g = 0x00;
 257                 result.b = 0xff;
 258         }
 259         else
 260         {
 261                 unsigned int temp = 0;
 262                 sscanf( color, "%d", &temp );
 263                 result.r = ( temp >> 24 ) & 0xff;
 264                 result.g = ( temp >> 16 ) & 0xff;
 265                 result.b = ( temp >> 8 ) & 0xff;
 266                 result.a = ( temp ) & 0xff;
 267         }
 268
 269         return result;
 270 }
 271
 272 /** Convert a string property to UTF-8
 273 */
 274 static int iconv_utf8( mlt_properties properties, char *prop_name, const char* encoding )
 275 {
 276         char *text = mlt_properties_get( properties, prop_name );
 277         int result = -1;
 278
 279         iconv_t cd = iconv_open( "UTF-8", encoding );
 280         if ( cd != ( iconv_t )-1 )
 281         {
 282                 char *inbuf_p = text;
 283                 size_t inbuf_n = strlen( text );
 284                 size_t outbuf_n = inbuf_n * 6;
 285                 char *outbuf = mlt_pool_alloc( outbuf_n );
 286                 char *outbuf_p = outbuf;
 287
 288                 memset( outbuf, 0, outbuf_n );
 289
 290                 if ( text != NULL && strcmp( text, "" ) && iconv( cd, &inbuf_p, &inbuf_n, &outbuf_p, &outbuf_n ) != -1 )
 291                         mlt_properties_set( properties, prop_name, outbuf );
 292                 else
 293                         mlt_properties_set( properties, prop_name, "" );
 294
 295                 mlt_pool_release( outbuf );
 296                 iconv_close( cd );
 297                 result = 0;
 298         }
 299         return result;
 300 }
 301
 302 static void refresh_image( mlt_frame frame, int width, int height )
 303 {
 304         // Pixbuf
 305         GdkPixbuf *pixbuf = NULL;
 306
 307         // Obtain properties of frame
 308         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 309
 310         // Obtain the producer pango for this frame
 311         producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
 312
 313         // Obtain the producer
 314         mlt_producer producer = &this->parent;
 315
 316         // Obtain the producer properties
 317         mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
 318
 319         // Get producer properties
 320         char *fg = mlt_properties_get( producer_props, "fgcolour" );
 321         char *bg = mlt_properties_get( producer_props, "bgcolour" );
 322         int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
 323         int pad = mlt_properties_get_int( producer_props, "pad" );
 324         char *markup = mlt_properties_get( producer_props, "markup" );
 325         char *text = mlt_properties_get( producer_props, "text" );
 326         char *font = mlt_properties_get( producer_props, "font" );
 327         char *encoding = mlt_properties_get( producer_props, "encoding" );
 328         int weight = mlt_properties_get_int( producer_props, "weight" );
 329         int size = mlt_properties_get_int( producer_props, "size" );
 330         int property_changed = ( align != this->align );
 331
 332         // Check for file support
 333         int position = mlt_properties_get_position( properties, "pango_position" );
 334         mlt_properties contents = mlt_properties_get_data( producer_props, "contents", NULL );
 335         mlt_geometry key_frames = mlt_properties_get_data( producer_props, "key_frames", NULL );
 336         struct mlt_geometry_item_s item;
 337         if ( contents != NULL )
 338         {
 339                 char temp[ 20 ];
 340                 mlt_geometry_prev_key( key_frames, &item, position );
 341                 sprintf( temp, "%d", item.frame );
 342                 markup = mlt_properties_get( contents, temp );
 343         }
 344
 345         // See if any properties changed
 346         property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
 347         property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
 348         property_changed = property_changed || ( pad != this->pad );
 349         property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
 350         property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
 351         property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
 352         property_changed = property_changed || ( weight != this->weight );
 353
 354         // Save the properties for next comparison
 355         this->align = align;
 356         this->pad = pad;
 357         set_string( &this->fgcolor, fg, "0xffffffff" );
 358         set_string( &this->bgcolor, bg, "0x00000000" );
 359         set_string( &this->markup, markup, NULL );
 360         set_string( &this->text, text, NULL );
 361         set_string( &this->font, font, "Sans 48" );
 362         this->weight = weight;
 363
 364         if ( property_changed )
 365         {
 366                 rgba_color fgcolor = parse_color( this->fgcolor );
 367                 rgba_color bgcolor = parse_color( this->bgcolor );
 368
 369                 mlt_pool_release( this->image );
 370                 mlt_pool_release( this->alpha );
 371                 this->image = NULL;
 372                 this->alpha = NULL;
 373
 374                 // Convert from specified encoding to UTF-8
 375                 if ( encoding != NULL && !strncaseeq( encoding, "utf-8", 5 ) && !strncaseeq( encoding, "utf8", 4 ) )
 376                 {
 377                         if ( markup != NULL && iconv_utf8( producer_props, "markup", encoding ) != -1 )
 378                         {
 379                                 markup = mlt_properties_get( producer_props, "markup" );
 380                                 set_string( &this->markup, markup, NULL );
 381                         }
 382                         if ( text != NULL && iconv_utf8( producer_props, "text", encoding ) != -1 )
 383                         {
 384                                 text = mlt_properties_get( producer_props, "text" );
 385                                 set_string( &this->text, text, NULL );
 386                         }
 387                 }
 388
 389                 // Render the title
 390                 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align, weight, size );
 391
 392                 if ( pixbuf != NULL )
 393                 {
 394                         // Register this pixbuf for destruction and reuse
 395                         mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
 396
 397                         mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
 398                         mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
 399
 400                         // Store the width/height of the pixbuf temporarily
 401                         this->width = gdk_pixbuf_get_width( pixbuf );
 402                         this->height = gdk_pixbuf_get_height( pixbuf );
 403                 }
 404         }
 405         else if ( width > 0 && ( this->image == NULL || width != this->width || height != this->height ) )
 406         {
 407                 mlt_pool_release( this->image );
 408                 mlt_pool_release( this->alpha );
 409                 this->image = NULL;
 410                 this->alpha = NULL;
 411
 412                 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
 413         }
 414
 415         // If we have a pixbuf and a valid width
 416         if ( pixbuf && width > 0 )
 417         {
 418                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 419                 int interp = GDK_INTERP_BILINEAR;
 420
 421                 if ( strcmp( interps, "nearest" ) == 0 )
 422                         interp = GDK_INTERP_NEAREST;
 423                 else if ( strcmp( interps, "tiles" ) == 0 )
 424                         interp = GDK_INTERP_TILES;
 425                 else if ( strcmp( interps, "hyper" ) == 0 )
 426                         interp = GDK_INTERP_HYPER;
 427
 428 //              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 );
 429
 430                 // Note - the original pixbuf is already safe and ready for destruction
 431                 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
 432
 433                 // Store width and height
 434                 this->width = width;
 435                 this->height = height;
 436
 437                 // Allocate/define image
 438                 this->image = mlt_pool_alloc( width * ( height + 1 ) * 2 );
 439                 this->alpha = mlt_pool_alloc( this->width * this->height );
 440
 441                 // Convert the image
 442                 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 443                                                                           this->width, this->height,
 444                                                                           gdk_pixbuf_get_rowstride( pixbuf ),
 445                                                                           this->image, this->alpha );
 446
 447                 // Finished with pixbuf now
 448                 g_object_unref( pixbuf );
 449         }
 450
 451         // Set width/height
 452         mlt_properties_set_int( properties, "width", this->width );
 453         mlt_properties_set_int( properties, "height", this->height );
 454         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
 455         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
 456
 457         // pass the image data without destructor
 458         mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * 2, NULL, NULL );
 459         mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
 460 }
 461
 462 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 463 {
 464         // Obtain properties of frame
 465         mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 466
 467         // We need to know the size of the image to clone it
 468         int image_size = 0;
 469         int alpha_size = 0;
 470
 471         // Alpha channel
 472         uint8_t *alpha = NULL;
 473
 474         *width = mlt_properties_get_int( properties, "rescale_width" );
 475         *height = mlt_properties_get_int( properties, "rescale_height" );
 476
 477         // Refresh the image
 478         pthread_mutex_lock( &pango_mutex );
 479         refresh_image( frame, *width, *height );
 480
 481         // Get the image
 482         *buffer = mlt_properties_get_data( properties, "image", &image_size );
 483         alpha = mlt_properties_get_data( properties, "alpha", &alpha_size );
 484
 485         // Get width and height
 486         *width = mlt_properties_get_int( properties, "width" );
 487         *height = mlt_properties_get_int( properties, "height" );
 488
 489         // Always clone here to allow 'animated' text
 490         if ( *buffer != NULL )
 491         {
 492                 // Clone the image and the alpha
 493                 uint8_t *image_copy = mlt_pool_alloc( image_size );
 494                 uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
 495
 496                 memcpy( image_copy, *buffer, image_size );
 497
 498                 // Copy or default the alpha
 499                 if ( alpha != NULL )
 500                         memcpy( alpha_copy, alpha, alpha_size );
 501                 else
 502                         memset( alpha_copy, 255, alpha_size );
 503
 504                 // Now update properties so we free the copy after
 505                 mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
 506                 mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
 507
 508                 // We're going to pass the copy on
 509                 *buffer = image_copy;
 510         }
 511         else
 512         {
 513                 // TODO: Review all cases of invalid images
 514                 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
 515                 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
 516                 *width = 50;
 517                 *height = 50;
 518         }
 519
 520         pthread_mutex_unlock( &pango_mutex );
 521
 522         return 0;
 523 }
 524
 525 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 526 {
 527         // Obtain properties of frame
 528         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 529
 530         // Return the alpha mask
 531         return mlt_properties_get_data( properties, "alpha", NULL );
 532 }
 533
 534 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 535 {
 536         producer_pango this = producer->child;
 537
 538         // Generate a frame
 539         *frame = mlt_frame_init( );
 540
 541         // Obtain properties of frame and producer
 542         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 543
 544         // Set the producer on the frame properties
 545         mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
 546
 547         // Update timecode on the frame we're creating
 548         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 549         mlt_properties_set_position( properties, "pango_position", mlt_producer_frame( producer ) );
 550
 551         // Refresh the pango image
 552         pthread_mutex_lock( &pango_mutex );
 553         refresh_image( *frame, 0, 0 );
 554         pthread_mutex_unlock( &pango_mutex );
 555
 556         // Set producer-specific frame properties
 557         mlt_properties_set_int( properties, "progressive", 1 );
 558         mlt_properties_set_double( properties, "aspect_ratio", 1 );
 559
 560         // Set alpha call back
 561         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 562
 563         // Stack the get image callback
 564         mlt_frame_push_get_image( *frame, producer_get_image );
 565
 566         // Calculate the next timecode
 567         mlt_producer_prepare_next( producer );
 568
 569         return 0;
 570 }
 571
 572 static void producer_close( mlt_producer parent )
 573 {
 574         producer_pango this = parent->child;
 575         mlt_pool_release( this->image );
 576         mlt_pool_release( this->alpha );
 577         free( this->fgcolor );
 578         free( this->bgcolor );
 579         free( this->markup );
 580         free( this->text );
 581         free( this->font );
 582         parent->close = NULL;
 583         mlt_producer_close( parent );
 584         free( this );
 585 }
 586
 587 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
 588 {
 589         int ww = gdk_pixbuf_get_width( pixbuf );
 590         int hh = gdk_pixbuf_get_height( pixbuf );
 591         uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
 592         int i, j;
 593
 594         for ( j = 0; j < hh; j++ )
 595         {
 596                 for ( i = 0; i < ww; i++ )
 597                 {
 598                         *p++ = bg.r;
 599                         *p++ = bg.g;
 600                         *p++ = bg.b;
 601                         *p++ = bg.a;
 602                 }
 603         }
 604 }
 605
 606 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 )
 607 {
 608         PangoContext *context = pango_ft2_font_map_create_context( fontmap );
 609         PangoLayout *layout = pango_layout_new( context );
 610         int w, h, x;
 611         int i, j;
 612         GdkPixbuf *pixbuf = NULL;
 613         FT_Bitmap bitmap;
 614         uint8_t *src = NULL;
 615         uint8_t* dest = NULL;
 616         uint8_t *d, *s, a;
 617         int stride;
 618         PangoFontDescription *desc = pango_font_description_from_string( font );
 619
 620         pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
 621         pango_layout_set_width( layout, -1 ); // set wrapping constraints
 622         pango_font_description_set_weight( desc, ( PangoWeight ) weight  );
 623         if ( size != 0 )
 624                 pango_font_description_set_size( desc, PANGO_SCALE * size );
 625         pango_layout_set_font_description( layout, desc );
 626 //      pango_layout_set_spacing( layout, space );
 627         pango_layout_set_alignment( layout, ( PangoAlignment ) align  );
 628         if ( markup != NULL && strcmp( markup, "" ) != 0 )
 629                 pango_layout_set_markup( layout, markup, strlen( markup ) );
 630         else if ( text != NULL && strcmp( text, "" ) != 0 )
 631                 pango_layout_set_text( layout, text, strlen( text ) );
 632         else
 633                 pango_layout_set_text( layout, "  ", 2 );
 634         pango_layout_get_pixel_size( layout, &w, &h );
 635
 636         pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
 637         pango_draw_background( pixbuf, bg );
 638
 639         stride = gdk_pixbuf_get_rowstride( pixbuf );
 640
 641         bitmap.width     = w;
 642         bitmap.pitch     = 32 * ( ( w + 31 ) / 31 );
 643         bitmap.rows      = h;
 644         bitmap.buffer    = mlt_pool_alloc( h * bitmap.pitch );
 645         bitmap.num_grays = 256;
 646         bitmap.pixel_mode = ft_pixel_mode_grays;
 647
 648         memset( bitmap.buffer, 0, h * bitmap.pitch );
 649
 650         pango_ft2_render_layout( &bitmap, layout, 0, 0 );
 651
 652         src = bitmap.buffer;
 653         x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
 654         dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
 655         j = h;
 656
 657         while( j -- )
 658         {
 659                 d = dest;
 660                 s = src;
 661                 i = w;
 662                 while( i -- )
 663                 {
 664                         a = *s ++;
 665                         *d++ = ( a * fg.r + ( 255 - a ) * bg.r ) >> 8;
 666                         *d++ = ( a * fg.g + ( 255 - a ) * bg.g ) >> 8;
 667                         *d++ = ( a * fg.b + ( 255 - a ) * bg.b ) >> 8;
 668                         *d++ = ( a * fg.a + ( 255 - a ) * bg.a ) >> 8;
 669                 }
 670                 dest += stride;
 671                 src += bitmap.pitch;
 672         }
 673         mlt_pool_release( bitmap.buffer );
 674         pango_font_description_free( desc );
 675         g_object_unref( layout );
 676         g_object_unref( context );
 677
 678         return pixbuf;
 679 }