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+ Moved ~ to LF hack to pango processing
[melted] / 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( properties, "resource", ( char * )filename );
150 mlt_properties_set_data( properties, "contents", contents, 0, ( mlt_destructor )mlt_properties_close, NULL );
151 mlt_properties_set_data( properties, "key_frames", key_frames, 0, ( mlt_destructor )mlt_geometry_close, NULL );
152
153 // Make sure we have at least one entry
154 if ( mlt_properties_get( contents, "0" ) == NULL )
155 mlt_properties_set( contents, "0", "" );
156
157 for ( i = 0; i < mlt_properties_count( contents ); i ++ )
158 {
159 char *name = mlt_properties_get_name( contents, i );
160 char *value = mlt_properties_get_value( contents, i );
161 while ( value != NULL && strchr( value, '~' ) )
162 ( *strchr( value, '~' ) ) = '\n';
163 item.frame = atoi( name );
164 mlt_geometry_insert( key_frames, &item );
165 }
166 }
167 else
168 {
169 FILE *f = fopen( filename, "r" );
170 if ( f != NULL )
171 {
172 char line[81];
173 char *markup = NULL;
174 size_t size = 0;
175 line[80] = '\0';
176
177 while ( fgets( line, 80, f ) )
178 {
179 size += strlen( line ) + 1;
180 if ( markup )
181 {
182 markup = realloc( markup, size );
183 strcat( markup, line );
184 }
185 else
186 {
187 markup = strdup( line );
188 }
189 }
190 fclose( f );
191
192 if ( markup[ strlen( markup ) - 1 ] == '\n' )
193 markup[ strlen( markup ) - 1 ] = '\0';
194
195 mlt_properties_set( properties, "resource", ( char * ) filename );
196 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
197 free( markup );
198 }
199 else
200 {
201 mlt_properties_set( properties, "markup", "" );
202 }
203 }
204
205 return producer;
206 }
207 free( this );
208 return NULL;
209 }
210
211 static void set_string( char **string, char *value, char *fallback )
212 {
213 if ( value != NULL )
214 {
215 free( *string );
216 *string = strdup( value );
217 }
218 else if ( *string == NULL && fallback != NULL )
219 {
220 *string = strdup( fallback );
221 }
222 else if ( *string != NULL && fallback == NULL )
223 {
224 free( *string );
225 *string = NULL;
226 }
227 }
228
229 rgba_color parse_color( char *color )
230 {
231 rgba_color result = { 0xff, 0xff, 0xff, 0xff };
232
233 if ( !strncmp( color, "0x", 2 ) )
234 {
235 unsigned int temp = 0;
236 sscanf( color + 2, "%x", &temp );
237 result.r = ( temp >> 24 ) & 0xff;
238 result.g = ( temp >> 16 ) & 0xff;
239 result.b = ( temp >> 8 ) & 0xff;
240 result.a = ( temp ) & 0xff;
241 }
242 else if ( !strcmp( color, "red" ) )
243 {
244 result.r = 0xff;
245 result.g = 0x00;
246 result.b = 0x00;
247 }
248 else if ( !strcmp( color, "green" ) )
249 {
250 result.r = 0x00;
251 result.g = 0xff;
252 result.b = 0x00;
253 }
254 else if ( !strcmp( color, "blue" ) )
255 {
256 result.r = 0x00;
257 result.g = 0x00;
258 result.b = 0xff;
259 }
260 else
261 {
262 unsigned int temp = 0;
263 sscanf( color, "%d", &temp );
264 result.r = ( temp >> 24 ) & 0xff;
265 result.g = ( temp >> 16 ) & 0xff;
266 result.b = ( temp >> 8 ) & 0xff;
267 result.a = ( temp ) & 0xff;
268 }
269
270 return result;
271 }
272
273 /** Convert a string property to UTF-8
274 */
275 static int iconv_utf8( mlt_properties properties, char *prop_name, const char* encoding )
276 {
277 char *text = mlt_properties_get( properties, prop_name );
278 int result = -1;
279
280 iconv_t cd = iconv_open( "UTF-8", encoding );
281 if ( cd != ( iconv_t )-1 )
282 {
283 char *inbuf_p = text;
284 size_t inbuf_n = strlen( text );
285 size_t outbuf_n = inbuf_n * 6;
286 char *outbuf = mlt_pool_alloc( outbuf_n );
287 char *outbuf_p = outbuf;
288
289 memset( outbuf, 0, outbuf_n );
290
291 if ( text != NULL && strcmp( text, "" ) && iconv( cd, &inbuf_p, &inbuf_n, &outbuf_p, &outbuf_n ) != -1 )
292 mlt_properties_set( properties, prop_name, outbuf );
293 else
294 mlt_properties_set( properties, prop_name, "" );
295
296 mlt_pool_release( outbuf );
297 iconv_close( cd );
298 result = 0;
299 }
300 return result;
301 }
302
303 static void refresh_image( mlt_frame frame, int width, int height )
304 {
305 // Pixbuf
306 GdkPixbuf *pixbuf = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "pixbuf", NULL );
307
308 // Obtain properties of frame
309 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
310
311 // Obtain the producer pango for this frame
312 producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
313
314 // Obtain the producer
315 mlt_producer producer = &this->parent;
316
317 // Obtain the producer properties
318 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
319
320 // Get producer properties
321 char *fg = mlt_properties_get( producer_props, "fgcolour" );
322 char *bg = mlt_properties_get( producer_props, "bgcolour" );
323 int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
324 int pad = mlt_properties_get_int( producer_props, "pad" );
325 char *markup = mlt_properties_get( producer_props, "markup" );
326 char *text = mlt_properties_get( producer_props, "text" );
327 char *font = mlt_properties_get( producer_props, "font" );
328 char *encoding = mlt_properties_get( producer_props, "encoding" );
329 int weight = mlt_properties_get_int( producer_props, "weight" );
330 int size = mlt_properties_get_int( producer_props, "size" );
331 int property_changed = 0;
332
333 if ( pixbuf == NULL )
334 {
335 // Check for file support
336 int position = mlt_properties_get_position( properties, "pango_position" );
337 mlt_properties contents = mlt_properties_get_data( producer_props, "contents", NULL );
338 mlt_geometry key_frames = mlt_properties_get_data( producer_props, "key_frames", NULL );
339 struct mlt_geometry_item_s item;
340 if ( contents != NULL )
341 {
342 char temp[ 20 ];
343 mlt_geometry_prev_key( key_frames, &item, position );
344 sprintf( temp, "%d", item.frame );
345 markup = mlt_properties_get( contents, temp );
346 }
347
348 // See if any properties changed
349 property_changed = ( align != this->align );
350 property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
351 property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
352 property_changed = property_changed || ( pad != this->pad );
353 property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
354 property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
355 property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
356 property_changed = property_changed || ( weight != this->weight );
357
358 // Save the properties for next comparison
359 this->align = align;
360 this->pad = pad;
361 set_string( &this->fgcolor, fg, "0xffffffff" );
362 set_string( &this->bgcolor, bg, "0x00000000" );
363 set_string( &this->markup, markup, NULL );
364 set_string( &this->text, text, NULL );
365 set_string( &this->font, font, "Sans 48" );
366 this->weight = weight;
367 }
368
369 if ( pixbuf == NULL && property_changed )
370 {
371 rgba_color fgcolor = parse_color( this->fgcolor );
372 rgba_color bgcolor = parse_color( this->bgcolor );
373
374 mlt_pool_release( this->image );
375 mlt_pool_release( this->alpha );
376 this->image = NULL;
377 this->alpha = NULL;
378
379 // Convert from specified encoding to UTF-8
380 if ( encoding != NULL && !strncaseeq( encoding, "utf-8", 5 ) && !strncaseeq( encoding, "utf8", 4 ) )
381 {
382 if ( markup != NULL && iconv_utf8( producer_props, "markup", encoding ) != -1 )
383 {
384 markup = mlt_properties_get( producer_props, "markup" );
385 set_string( &this->markup, markup, NULL );
386 }
387 if ( text != NULL && iconv_utf8( producer_props, "text", encoding ) != -1 )
388 {
389 text = mlt_properties_get( producer_props, "text" );
390 set_string( &this->text, text, NULL );
391 }
392 }
393
394 // Render the title
395 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align, weight, size );
396
397 if ( pixbuf != NULL )
398 {
399 // Register this pixbuf for destruction and reuse
400 mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
401 g_object_ref( pixbuf );
402 mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
403
404 mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
405 mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
406
407 // Store the width/height of the pixbuf temporarily
408 this->width = gdk_pixbuf_get_width( pixbuf );
409 this->height = gdk_pixbuf_get_height( pixbuf );
410 }
411 }
412 else if ( pixbuf == NULL && ( width > 0 && ( this->image == NULL || width != this->width || height != this->height ) ) )
413 {
414 mlt_pool_release( this->image );
415 mlt_pool_release( this->alpha );
416 this->image = NULL;
417 this->alpha = NULL;
418
419 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
420 }
421
422 // If we have a pixbuf and a valid width
423 if ( pixbuf && width > 0 )
424 {
425 char *interps = mlt_properties_get( properties, "rescale.interp" );
426 int interp = GDK_INTERP_BILINEAR;
427
428 if ( strcmp( interps, "nearest" ) == 0 )
429 interp = GDK_INTERP_NEAREST;
430 else if ( strcmp( interps, "tiles" ) == 0 )
431 interp = GDK_INTERP_TILES;
432 else if ( strcmp( interps, "hyper" ) == 0 )
433 interp = GDK_INTERP_HYPER;
434
435 // 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 );
436
437 // Note - the original pixbuf is already safe and ready for destruction
438 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
439
440 // Store width and height
441 this->width = width;
442 this->height = height;
443
444 // Allocate/define image
445 this->image = mlt_pool_alloc( width * ( height + 1 ) * 2 );
446 this->alpha = mlt_pool_alloc( this->width * this->height );
447
448 // Convert the image
449 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
450 this->width, this->height,
451 gdk_pixbuf_get_rowstride( pixbuf ),
452 this->image, this->alpha );
453
454 // Finished with pixbuf now
455 g_object_unref( pixbuf );
456 }
457
458 // Set width/height
459 mlt_properties_set_int( properties, "width", this->width );
460 mlt_properties_set_int( properties, "height", this->height );
461 mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
462 mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
463
464 // pass the image data without destructor
465 mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * 2, NULL, NULL );
466 mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
467 }
468
469 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
470 {
471 // Obtain properties of frame
472 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
473
474 // We need to know the size of the image to clone it
475 int image_size = 0;
476 int alpha_size = 0;
477
478 // Alpha channel
479 uint8_t *alpha = NULL;
480
481 *width = mlt_properties_get_int( properties, "rescale_width" );
482 *height = mlt_properties_get_int( properties, "rescale_height" );
483
484 // Refresh the image
485 pthread_mutex_lock( &pango_mutex );
486 refresh_image( frame, *width, *height );
487
488 // Get the image
489 *buffer = mlt_properties_get_data( properties, "image", &image_size );
490 alpha = mlt_properties_get_data( properties, "alpha", &alpha_size );
491
492 // Get width and height
493 *width = mlt_properties_get_int( properties, "width" );
494 *height = mlt_properties_get_int( properties, "height" );
495
496 // Always clone here to allow 'animated' text
497 if ( *buffer != NULL )
498 {
499 // Clone the image and the alpha
500 uint8_t *image_copy = mlt_pool_alloc( image_size );
501 uint8_t *alpha_copy = mlt_pool_alloc( alpha_size );
502
503 memcpy( image_copy, *buffer, image_size );
504
505 // Copy or default the alpha
506 if ( alpha != NULL )
507 memcpy( alpha_copy, alpha, alpha_size );
508 else
509 memset( alpha_copy, 255, alpha_size );
510
511 // Now update properties so we free the copy after
512 mlt_properties_set_data( properties, "image", image_copy, image_size, mlt_pool_release, NULL );
513 mlt_properties_set_data( properties, "alpha", alpha_copy, alpha_size, mlt_pool_release, NULL );
514
515 // We're going to pass the copy on
516 *buffer = image_copy;
517 }
518 else
519 {
520 // TODO: Review all cases of invalid images
521 *buffer = mlt_pool_alloc( 50 * 50 * 2 );
522 mlt_properties_set_data( properties, "image", *buffer, image_size, mlt_pool_release, NULL );
523 *width = 50;
524 *height = 50;
525 }
526
527 pthread_mutex_unlock( &pango_mutex );
528
529 return 0;
530 }
531
532 static uint8_t *producer_get_alpha_mask( mlt_frame this )
533 {
534 // Obtain properties of frame
535 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
536
537 // Return the alpha mask
538 return mlt_properties_get_data( properties, "alpha", NULL );
539 }
540
541 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
542 {
543 producer_pango this = producer->child;
544
545 // Generate a frame
546 *frame = mlt_frame_init( );
547
548 // Obtain properties of frame and producer
549 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
550
551 // Set the producer on the frame properties
552 mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
553
554 // Update timecode on the frame we're creating
555 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
556 mlt_properties_set_position( properties, "pango_position", mlt_producer_frame( producer ) );
557
558 // Refresh the pango image
559 pthread_mutex_lock( &pango_mutex );
560 refresh_image( *frame, 0, 0 );
561 pthread_mutex_unlock( &pango_mutex );
562
563 // Set producer-specific frame properties
564 mlt_properties_set_int( properties, "progressive", 1 );
565 mlt_properties_set_double( properties, "aspect_ratio", 1 );
566
567 // Set alpha call back
568 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
569
570 // Stack the get image callback
571 mlt_frame_push_get_image( *frame, producer_get_image );
572
573 // Calculate the next timecode
574 mlt_producer_prepare_next( producer );
575
576 return 0;
577 }
578
579 static void producer_close( mlt_producer parent )
580 {
581 producer_pango this = parent->child;
582 mlt_pool_release( this->image );
583 mlt_pool_release( this->alpha );
584 free( this->fgcolor );
585 free( this->bgcolor );
586 free( this->markup );
587 free( this->text );
588 free( this->font );
589 parent->close = NULL;
590 mlt_producer_close( parent );
591 free( this );
592 }
593
594 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
595 {
596 int ww = gdk_pixbuf_get_width( pixbuf );
597 int hh = gdk_pixbuf_get_height( pixbuf );
598 uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
599 int i, j;
600
601 for ( j = 0; j < hh; j++ )
602 {
603 for ( i = 0; i < ww; i++ )
604 {
605 *p++ = bg.r;
606 *p++ = bg.g;
607 *p++ = bg.b;
608 *p++ = bg.a;
609 }
610 }
611 }
612
613 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 )
614 {
615 PangoContext *context = pango_ft2_font_map_create_context( fontmap );
616 PangoLayout *layout = pango_layout_new( context );
617 int w, h, x;
618 int i, j;
619 GdkPixbuf *pixbuf = NULL;
620 FT_Bitmap bitmap;
621 uint8_t *src = NULL;
622 uint8_t* dest = NULL;
623 uint8_t *d, *s, a;
624 int stride;
625 PangoFontDescription *desc = pango_font_description_from_string( font );
626
627 pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
628 pango_layout_set_width( layout, -1 ); // set wrapping constraints
629 pango_font_description_set_weight( desc, ( PangoWeight ) weight );
630 if ( size != 0 )
631 pango_font_description_set_size( desc, PANGO_SCALE * size );
632 pango_layout_set_font_description( layout, desc );
633 // pango_layout_set_spacing( layout, space );
634 pango_layout_set_alignment( layout, ( PangoAlignment ) align );
635 if ( markup != NULL && strcmp( markup, "" ) != 0 )
636 {
637 pango_layout_set_markup( layout, markup, strlen( markup ) );
638 }
639 else if ( text != NULL && strcmp( text, "" ) != 0 )
640 {
641 // Replace all ~'s with a line feed (silly convention, but handy)
642 char *copy = strdup( text );
643 while ( strchr( copy, '~' ) )
644 ( *strchr( copy, '~' ) ) = '\n';
645 pango_layout_set_text( layout, copy, strlen( copy ) );
646 free( copy );
647 }
648 else
649 {
650 // Pango doesn't like empty strings
651 pango_layout_set_text( layout, " ", 2 );
652 }
653 pango_layout_get_pixel_size( layout, &w, &h );
654
655 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
656 pango_draw_background( pixbuf, bg );
657
658 stride = gdk_pixbuf_get_rowstride( pixbuf );
659
660 bitmap.width = w;
661 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
662 bitmap.rows = h;
663 bitmap.buffer = mlt_pool_alloc( h * bitmap.pitch );
664 bitmap.num_grays = 256;
665 bitmap.pixel_mode = ft_pixel_mode_grays;
666
667 memset( bitmap.buffer, 0, h * bitmap.pitch );
668
669 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
670
671 src = bitmap.buffer;
672 x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
673 dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
674 j = h;
675
676 while( j -- )
677 {
678 d = dest;
679 s = src;
680 i = w;
681 while( i -- )
682 {
683 a = *s ++;
684 *d++ = ( a * fg.r + ( 255 - a ) * bg.r ) >> 8;
685 *d++ = ( a * fg.g + ( 255 - a ) * bg.g ) >> 8;
686 *d++ = ( a * fg.b + ( 255 - a ) * bg.b ) >> 8;
687 *d++ = ( a * fg.a + ( 255 - a ) * bg.a ) >> 8;
688 }
689 dest += stride;
690 src += bitmap.pitch;
691 }
692 mlt_pool_release( bitmap.buffer );
693 pango_font_description_free( desc );
694 g_object_unref( layout );
695 g_object_unref( context );
696
697 return pixbuf;
698 }
my melted branch