2 * producer_pango.c -- a pango-based titler
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt_producer.h>
22 #include <framework/mlt_frame.h>
23 #include <framework/mlt_geometry.h>
26 #include <gdk-pixbuf/gdk-pixbuf.h>
27 #include <pango/pangoft2.h>
28 #include <freetype/freetype.h>
33 typedef struct producer_pango_s *producer_pango;
42 static pthread_mutex_t pango_mutex = PTHREAD_MUTEX_INITIALIZER;
44 struct producer_pango_s
46 struct mlt_producer_s parent;
60 // special color type used by internal pango routines
66 // Forward declarations
67 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
68 static void producer_close( mlt_producer parent );
69 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
70 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font,
71 rgba_color fg, rgba_color bg, int pad, int align, int weight, int size );
73 /** Return nonzero if the two strings are equal, ignoring case, up to
74 the first n characters.
76 int strncaseeq(const char *s1, const char *s2, size_t n)
80 if (tolower(*s1++) != tolower(*s2++))
86 /** Parse the alignment property.
89 static int alignment_parse( char* align )
91 int ret = pango_align_left;
94 else if ( isdigit( align[ 0 ] ) )
96 else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
97 ret = pango_align_center;
98 else if ( align[ 0 ] == 'r' )
99 ret = pango_align_right;
104 static PangoFT2FontMap *fontmap = NULL;
106 mlt_producer producer_pango_init( const char *filename )
108 producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
109 if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
111 mlt_producer producer = &this->parent;
113 pthread_mutex_lock( &pango_mutex );
114 if ( fontmap == NULL )
115 fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
117 pthread_mutex_unlock( &pango_mutex );
119 producer->get_frame = producer_get_frame;
120 producer->close = ( mlt_destructor )producer_close;
122 // Get the properties interface
123 mlt_properties properties = MLT_PRODUCER_PROPERTIES( &this->parent );
125 // Set the default properties
126 mlt_properties_set( properties, "fgcolour", "0xffffffff" );
127 mlt_properties_set( properties, "bgcolour", "0x00000000" );
128 mlt_properties_set_int( properties, "align", pango_align_left );
129 mlt_properties_set_int( properties, "pad", 0 );
130 mlt_properties_set( properties, "text", "" );
131 mlt_properties_set( properties, "font", "Sans 48" );
132 mlt_properties_set( properties, "encoding", "UTF-8" );
133 mlt_properties_set_int( properties, "weight", PANGO_WEIGHT_NORMAL );
135 if ( filename == NULL || ( filename && ( !strcmp( filename, "" )
136 // workaround for old kdenlive countdown generator
137 || strstr( filename, "<producer>" ) ) ) )
139 mlt_properties_set( properties, "markup", "" );
141 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
143 char *copy = strdup( filename + 1 );
145 if ( strstr( markup, "/+" ) )
146 markup = strstr( markup, "/+" ) + 2;
147 ( *strrchr( markup, '.' ) ) = '\0';
148 while ( strchr( markup, '~' ) )
149 ( *strchr( markup, '~' ) ) = '\n';
150 mlt_properties_set( properties, "resource", filename );
151 mlt_properties_set( properties, "markup", markup );
154 else if ( strstr( filename, ".mpl" ) )
157 mlt_properties contents = mlt_properties_load( filename );
158 mlt_geometry key_frames = mlt_geometry_init( );
159 struct mlt_geometry_item_s item;
160 mlt_properties_set( properties, "resource", filename );
161 mlt_properties_set_data( properties, "contents", contents, 0, ( mlt_destructor )mlt_properties_close, NULL );
162 mlt_properties_set_data( properties, "key_frames", key_frames, 0, ( mlt_destructor )mlt_geometry_close, NULL );
164 // Make sure we have at least one entry
165 if ( mlt_properties_get( contents, "0" ) == NULL )
166 mlt_properties_set( contents, "0", "" );
168 for ( i = 0; i < mlt_properties_count( contents ); i ++ )
170 char *name = mlt_properties_get_name( contents, i );
171 char *value = mlt_properties_get_value( contents, i );
172 while ( value != NULL && strchr( value, '~' ) )
173 ( *strchr( value, '~' ) ) = '\n';
174 item.frame = atoi( name );
175 mlt_geometry_insert( key_frames, &item );
177 mlt_geometry_interpolate( key_frames );
181 FILE *f = fopen( filename, "r" );
189 while ( fgets( line, 80, f ) )
191 size += strlen( line ) + 1;
194 markup = realloc( markup, size );
195 strcat( markup, line );
199 markup = strdup( line );
204 if ( markup[ strlen( markup ) - 1 ] == '\n' )
205 markup[ strlen( markup ) - 1 ] = '\0';
207 mlt_properties_set( properties, "resource", filename );
208 mlt_properties_set( properties, "markup", ( markup == NULL ? "" : markup ) );
213 producer->close = NULL;
214 mlt_producer_close( producer );
226 static void set_string( char **string, const char *value, const char *fallback )
231 *string = strdup( value );
233 else if ( *string == NULL && fallback != NULL )
235 *string = strdup( fallback );
237 else if ( *string != NULL && fallback == NULL )
244 rgba_color parse_color( char *color, unsigned int color_int )
246 rgba_color result = { 0xff, 0xff, 0xff, 0xff };
248 if ( !strcmp( color, "red" ) )
254 else if ( !strcmp( color, "green" ) )
260 else if ( !strcmp( color, "blue" ) )
266 else if ( strcmp( color, "white" ) )
268 result.r = ( color_int >> 24 ) & 0xff;
269 result.g = ( color_int >> 16 ) & 0xff;
270 result.b = ( color_int >> 8 ) & 0xff;
271 result.a = ( color_int ) & 0xff;
277 /** Convert a string property to UTF-8
279 static int iconv_utf8( mlt_properties properties, const char *prop_name, const char* encoding )
281 char *text = mlt_properties_get( properties, prop_name );
284 iconv_t cd = iconv_open( "UTF-8", encoding );
285 if ( cd != ( iconv_t )-1 )
287 char *inbuf_p = text;
288 size_t inbuf_n = strlen( text );
289 size_t outbuf_n = inbuf_n * 6;
290 char *outbuf = mlt_pool_alloc( outbuf_n );
291 char *outbuf_p = outbuf;
293 memset( outbuf, 0, outbuf_n );
295 if ( text != NULL && strcmp( text, "" ) && iconv( cd, &inbuf_p, &inbuf_n, &outbuf_p, &outbuf_n ) != -1 )
296 mlt_properties_set( properties, prop_name, outbuf );
298 mlt_properties_set( properties, prop_name, "" );
300 mlt_pool_release( outbuf );
307 static void refresh_image( mlt_frame frame, int width, int height )
310 GdkPixbuf *pixbuf = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "pixbuf", NULL );
312 // Obtain properties of frame
313 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
315 // Obtain the producer pango for this frame
316 producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
318 // Obtain the producer
319 mlt_producer producer = &this->parent;
321 // Obtain the producer properties
322 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
324 // Get producer properties
325 char *fg = mlt_properties_get( producer_props, "fgcolour" );
326 char *bg = mlt_properties_get( producer_props, "bgcolour" );
327 int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
328 int pad = mlt_properties_get_int( producer_props, "pad" );
329 char *markup = mlt_properties_get( producer_props, "markup" );
330 char *text = mlt_properties_get( producer_props, "text" );
331 char *font = mlt_properties_get( producer_props, "font" );
332 char *encoding = mlt_properties_get( producer_props, "encoding" );
333 int weight = mlt_properties_get_int( producer_props, "weight" );
334 int size = mlt_properties_get_int( producer_props, "size" );
335 int property_changed = 0;
337 if ( pixbuf == NULL )
339 // Check for file support
340 int position = mlt_properties_get_position( properties, "pango_position" );
341 mlt_properties contents = mlt_properties_get_data( producer_props, "contents", NULL );
342 mlt_geometry key_frames = mlt_properties_get_data( producer_props, "key_frames", NULL );
343 struct mlt_geometry_item_s item;
344 if ( contents != NULL )
347 mlt_geometry_prev_key( key_frames, &item, position );
348 sprintf( temp, "%d", item.frame );
349 markup = mlt_properties_get( contents, temp );
352 // See if any properties changed
353 property_changed = ( align != this->align );
354 property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
355 property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
356 property_changed = property_changed || ( pad != this->pad );
357 property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
358 property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
359 property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
360 property_changed = property_changed || ( weight != this->weight );
362 // Save the properties for next comparison
365 set_string( &this->fgcolor, fg, "0xffffffff" );
366 set_string( &this->bgcolor, bg, "0x00000000" );
367 set_string( &this->markup, markup, NULL );
368 set_string( &this->text, text, NULL );
369 set_string( &this->font, font, "Sans 48" );
370 this->weight = weight;
373 if ( pixbuf == NULL && property_changed )
375 rgba_color fgcolor = parse_color( this->fgcolor, mlt_properties_get_int( producer_props, "fgcolour" ) );
376 rgba_color bgcolor = parse_color( this->bgcolor, mlt_properties_get_int( producer_props, "bgcolour" ) );
379 g_object_unref( this->pixbuf );
382 // Convert from specified encoding to UTF-8
383 if ( encoding != NULL && !strncaseeq( encoding, "utf-8", 5 ) && !strncaseeq( encoding, "utf8", 4 ) )
385 if ( markup != NULL && iconv_utf8( producer_props, "markup", encoding ) != -1 )
387 markup = mlt_properties_get( producer_props, "markup" );
388 set_string( &this->markup, markup, NULL );
390 if ( text != NULL && iconv_utf8( producer_props, "text", encoding ) != -1 )
392 text = mlt_properties_get( producer_props, "text" );
393 set_string( &this->text, text, NULL );
398 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align, weight, size );
400 if ( pixbuf != NULL )
402 // Register this pixbuf for destruction and reuse
403 mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
404 g_object_ref( pixbuf );
405 mlt_properties_set_data( MLT_FRAME_PROPERTIES( frame ), "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
407 mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
408 mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
410 // Store the width/height of the pixbuf temporarily
411 this->width = gdk_pixbuf_get_width( pixbuf );
412 this->height = gdk_pixbuf_get_height( pixbuf );
415 else if ( pixbuf == NULL && width > 0 && ( this->pixbuf == NULL || width != this->width || height != this->height ) )
418 g_object_unref( this->pixbuf );
420 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
423 // If we have a pixbuf and a valid width
424 if ( pixbuf && width > 0 )
426 char *interps = mlt_properties_get( properties, "rescale.interp" );
427 int interp = GDK_INTERP_BILINEAR;
429 if ( strcmp( interps, "nearest" ) == 0 )
430 interp = GDK_INTERP_NEAREST;
431 else if ( strcmp( interps, "tiles" ) == 0 )
432 interp = GDK_INTERP_TILES;
433 else if ( strcmp( interps, "hyper" ) == 0 || strcmp( interps, "bicubic" ) == 0 )
434 interp = GDK_INTERP_HYPER;
436 // fprintf(stderr,"%s: scaling from %dx%d to %dx%d\n", __FILE__, this->width, this->height, width, height);
438 // Note - the original pixbuf is already safe and ready for destruction
439 this->pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
441 // Store width and height
443 this->height = height;
447 mlt_properties_set_int( properties, "width", this->width );
448 mlt_properties_set_int( properties, "height", this->height );
449 mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
450 mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
453 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
456 producer_pango this = ( producer_pango ) mlt_frame_pop_service( frame );
458 // Obtain properties of frame
459 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
461 *width = mlt_properties_get_int( properties, "rescale_width" );
462 *height = mlt_properties_get_int( properties, "rescale_height" );
464 mlt_service_lock( MLT_PRODUCER_SERVICE( &this->parent ) );
467 pthread_mutex_lock( &pango_mutex );
468 refresh_image( frame, *width, *height );
470 // Get width and height
471 *width = this->width;
472 *height = this->height;
474 // Always clone here to allow 'animated' text
478 int image_size = this->width * this->height * 4;
479 *buffer = mlt_pool_alloc( image_size );
480 memcpy( *buffer, gdk_pixbuf_get_pixels( this->pixbuf ), image_size );
482 // Now update properties so we free the copy after
483 mlt_frame_set_image( frame, *buffer, image_size, mlt_pool_release );
484 *format = mlt_image_rgb24a;
491 pthread_mutex_unlock( &pango_mutex );
492 mlt_service_unlock( MLT_PRODUCER_SERVICE( &this->parent ) );
497 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
499 producer_pango this = producer->child;
502 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
504 // Obtain properties of frame and producer
505 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
507 // Set the producer on the frame properties
508 mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
510 // Update timecode on the frame we're creating
511 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
512 mlt_properties_set_position( properties, "pango_position", mlt_producer_frame( producer ) );
514 // Refresh the pango image
515 pthread_mutex_lock( &pango_mutex );
516 refresh_image( *frame, 0, 0 );
517 pthread_mutex_unlock( &pango_mutex );
519 // Set producer-specific frame properties
520 mlt_properties_set_int( properties, "progressive", 1 );
521 mlt_properties_set_double( properties, "aspect_ratio", 1 );
523 // Stack the get image callback
524 mlt_frame_push_service( *frame, this );
525 mlt_frame_push_get_image( *frame, producer_get_image );
527 // Calculate the next timecode
528 mlt_producer_prepare_next( producer );
533 static void producer_close( mlt_producer parent )
535 producer_pango this = parent->child;
537 g_object_unref( this->pixbuf );
538 free( this->fgcolor );
539 free( this->bgcolor );
540 free( this->markup );
543 parent->close = NULL;
544 mlt_producer_close( parent );
548 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
550 int ww = gdk_pixbuf_get_width( pixbuf );
551 int hh = gdk_pixbuf_get_height( pixbuf );
552 uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
555 for ( j = 0; j < hh; j++ )
557 for ( i = 0; i < ww; i++ )
567 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 )
569 PangoContext *context = pango_ft2_font_map_create_context( fontmap );
570 PangoLayout *layout = pango_layout_new( context );
573 GdkPixbuf *pixbuf = NULL;
576 uint8_t* dest = NULL;
579 PangoFontDescription *desc = pango_font_description_from_string( font );
581 pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
582 pango_layout_set_width( layout, -1 ); // set wrapping constraints
583 pango_font_description_set_weight( desc, ( PangoWeight ) weight );
585 pango_font_description_set_absolute_size( desc, PANGO_SCALE * size );
586 pango_layout_set_font_description( layout, desc );
587 // pango_layout_set_spacing( layout, space );
588 pango_layout_set_alignment( layout, ( PangoAlignment ) align );
589 if ( markup != NULL && strcmp( markup, "" ) != 0 )
591 pango_layout_set_markup( layout, markup, strlen( markup ) );
593 else if ( text != NULL && strcmp( text, "" ) != 0 )
595 // Replace all ~'s with a line feed (silly convention, but handy)
596 char *copy = strdup( text );
597 while ( strchr( copy, '~' ) )
598 ( *strchr( copy, '~' ) ) = '\n';
599 pango_layout_set_text( layout, copy, strlen( copy ) );
604 // Pango doesn't like empty strings
605 pango_layout_set_text( layout, " ", 2 );
607 pango_layout_get_pixel_size( layout, &w, &h );
609 // Interpret size property as an absolute pixel height and compensate for
610 // freetype's "interpretation" of our absolute size request. This gives
611 // precise control over compositing and better quality by reducing scaling
612 // artifacts with composite geometries that constrain the dimensions.
613 // If you do not want this, then put the size in the font property or in
617 pango_font_description_set_absolute_size( desc, PANGO_SCALE * size * size/h );
618 pango_layout_set_font_description( layout, desc );
619 pango_layout_get_pixel_size( layout, &w, &h );
625 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
626 pango_draw_background( pixbuf, bg );
628 stride = gdk_pixbuf_get_rowstride( pixbuf );
631 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
633 bitmap.buffer = mlt_pool_alloc( h * bitmap.pitch );
634 bitmap.num_grays = 256;
635 bitmap.pixel_mode = ft_pixel_mode_grays;
637 memset( bitmap.buffer, 0, h * bitmap.pitch );
639 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
642 x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
643 dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
654 *d++ = ( a * fg.r + ( 255 - a ) * bg.r ) >> 8;
655 *d++ = ( a * fg.g + ( 255 - a ) * bg.g ) >> 8;
656 *d++ = ( a * fg.b + ( 255 - a ) * bg.b ) >> 8;
657 *d++ = ( a * fg.a + ( 255 - a ) * bg.a ) >> 8;
662 mlt_pool_release( bitmap.buffer );
663 pango_font_description_free( desc );
664 g_object_unref( layout );
665 g_object_unref( context );