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 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.
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.
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.
21 #include "producer_pango.h"
22 #include <framework/mlt_frame.h>
25 #include <gdk-pixbuf/gdk-pixbuf.h>
26 #include <pango/pangoft2.h>
27 #include <freetype/freetype.h>
29 struct producer_pango_s
31 struct mlt_producer_s parent
;
47 // special color type used by internal pango routines
53 // Forward declarations
54 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int index
);
55 static void producer_close( mlt_producer parent
);
56 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
);
57 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
,
58 rgba_color fg
, rgba_color bg
, int pad
, int align
);
60 /** Parse the alignment property.
63 static int alignment_parse( char* align
)
65 int ret
= pango_align_left
;
68 else if ( isdigit( align
[ 0 ] ) )
70 else if ( align
[ 0 ] == 'c' || align
[ 0 ] == 'm' )
71 ret
= pango_align_center
;
72 else if ( align
[ 0 ] == 'r' )
73 ret
= pango_align_right
;
78 mlt_producer
producer_pango_init( const char *filename
)
80 producer_pango
this = calloc( sizeof( struct producer_pango_s
), 1 );
81 if ( this != NULL
&& mlt_producer_init( &this->parent
, this ) == 0 )
83 mlt_producer producer
= &this->parent
;
85 producer
->get_frame
= producer_get_frame
;
86 producer
->close
= producer_close
;
88 // This is required to initialise gdk-pixbuf
91 // Get the properties interface
92 mlt_properties properties
= mlt_producer_properties( &this->parent
);
94 // Set the default properties
95 mlt_properties_set( properties
, "fgcolour", "0xffffffff" );
96 mlt_properties_set( properties
, "bgcolour", "0x00000000" );
97 mlt_properties_set_int( properties
, "align", pango_align_left
);
98 mlt_properties_set_int( properties
, "pad", 0 );
99 mlt_properties_set( properties
, "text", "" );
100 mlt_properties_set( properties
, "font", "Sans 48" );
102 if ( filename
== NULL
)
104 mlt_properties_set( properties
, "resource", "pango" );
105 mlt_properties_set( properties
, "markup", "" );
107 else if ( filename
[ 0 ] == '+' || strstr( filename
, "/+" ) )
109 char *copy
= strdup( filename
+ 1 );
111 if ( strstr( markup
, "/+" ) )
112 markup
= strstr( markup
, "/+" ) + 2;
113 ( *strrchr( markup
, '.' ) ) = '\0';
114 while ( strchr( markup
, '~' ) )
115 ( *strchr( markup
, '~' ) ) = '\n';
116 mlt_properties_set( properties
, "resource", ( char * )filename
);
117 mlt_properties_set( properties
, "markup", markup
);
122 FILE *f
= fopen( filename
, "r" );
130 while ( fgets( line
, 80, f
) )
132 size
+= strlen( line
) + 1;
135 markup
= realloc( markup
, size
);
136 strcat( markup
, line
);
140 markup
= strdup( line
);
145 if ( markup
[ strlen( markup
) - 1 ] == '\n' )
146 markup
[ strlen( markup
) - 1 ] = '\0';
148 mlt_properties_set( properties
, "resource", ( char * ) filename
);
149 mlt_properties_set( properties
, "markup", ( char * ) ( markup
== NULL ?
"" : markup
) );
154 mlt_properties_set( properties
, "resource", "pango" );
155 mlt_properties_set( properties
, "markup", "" );
165 static void set_string( char **string
, char *value
, char *fallback
)
170 *string
= strdup( value
);
172 else if ( *string
== NULL
&& fallback
!= NULL
)
174 *string
= strdup( fallback
);
176 else if ( *string
!= NULL
&& fallback
== NULL
)
183 rgba_color
parse_color( char *color
)
185 rgba_color result
= { 0xff, 0xff, 0xff, 0xff };
187 if ( !strncmp( color
, "0x", 2 ) )
189 unsigned int temp
= 0;
190 sscanf( color
+ 2, "%x", &temp
);
191 result
.r
= ( temp
>> 24 ) & 0xff;
192 result
.g
= ( temp
>> 16 ) & 0xff;
193 result
.b
= ( temp
>> 8 ) & 0xff;
194 result
.a
= ( temp
) & 0xff;
196 else if ( !strcmp( color
, "red" ) )
202 else if ( !strcmp( color
, "green" ) )
208 else if ( !strcmp( color
, "blue" ) )
216 unsigned int temp
= 0;
217 sscanf( color
, "%d", &temp
);
218 result
.r
= ( temp
>> 24 ) & 0xff;
219 result
.g
= ( temp
>> 16 ) & 0xff;
220 result
.b
= ( temp
>> 8 ) & 0xff;
221 result
.a
= ( temp
) & 0xff;
227 static void refresh_image( mlt_frame frame
, int width
, int height
)
230 GdkPixbuf
*pixbuf
= NULL
;
232 // Obtain properties of frame
233 mlt_properties properties
= mlt_frame_properties( frame
);
235 // Obtain the producer pango for this frame
236 producer_pango
this = mlt_properties_get_data( properties
, "producer_pango", NULL
);
238 // Obtain the producer
239 mlt_producer producer
= &this->parent
;
241 // Obtain the producer properties
242 mlt_properties producer_props
= mlt_producer_properties( producer
);
244 // Get producer properties
245 char *fg
= mlt_properties_get( producer_props
, "fgcolour" );
246 char *bg
= mlt_properties_get( producer_props
, "bgcolour" );
247 int align
= alignment_parse( mlt_properties_get( producer_props
, "align" ) );
248 int pad
= mlt_properties_get_int( producer_props
, "pad" );
249 char *markup
= mlt_properties_get( producer_props
, "markup" );
250 char *text
= mlt_properties_get( producer_props
, "text" );
251 char *font
= mlt_properties_get( producer_props
, "font" );
253 // See if any properties changed
254 int property_changed
= ( align
!= this->align
);
255 property_changed
= property_changed
|| ( this->fgcolor
== NULL
|| ( fg
&& strcmp( fg
, this->fgcolor
) ) );
256 property_changed
= property_changed
|| ( this->bgcolor
== NULL
|| ( bg
&& strcmp( bg
, this->bgcolor
) ) );
257 property_changed
= property_changed
|| ( pad
!= this->pad
);
258 property_changed
= property_changed
|| ( markup
&& this->markup
&& strcmp( markup
, this->markup
) );
259 property_changed
= property_changed
|| ( text
&& this->text
&& strcmp( text
, this->text
) );
260 property_changed
= property_changed
|| ( font
&& this->font
&& strcmp( font
, this->font
) );
262 // Save the properties for next comparison
265 set_string( &this->fgcolor
, fg
, "0xffffffff" );
266 set_string( &this->bgcolor
, bg
, "0x00000000" );
267 set_string( &this->markup
, markup
, NULL
);
268 set_string( &this->text
, text
, NULL
);
269 set_string( &this->font
, font
, "Sans 48" );
271 if ( property_changed
)
273 rgba_color fgcolor
= parse_color( this->fgcolor
);
274 rgba_color bgcolor
= parse_color( this->bgcolor
);
276 mlt_pool_release( this->image_release
);
277 mlt_pool_release( this->alpha_release
);
278 this->image_release
= NULL
;
279 this->alpha_release
= NULL
;
284 pixbuf
= pango_get_pixbuf( markup
, text
, font
, fgcolor
, bgcolor
, pad
, align
);
286 if ( pixbuf
!= NULL
)
288 // Register this pixbuf for destruction and reuse
289 mlt_properties_set_data( producer_props
, "pixbuf", pixbuf
, 0, ( mlt_destructor
)g_object_unref
, NULL
);
291 mlt_properties_set_int( producer_props
, "real_width", gdk_pixbuf_get_width( pixbuf
) );
292 mlt_properties_set_int( producer_props
, "real_height", gdk_pixbuf_get_height( pixbuf
) );
294 // Store the width/height of the pixbuf temporarily
295 this->width
= gdk_pixbuf_get_width( pixbuf
);
296 this->height
= gdk_pixbuf_get_height( pixbuf
);
299 else if ( width
> 0 && ( this->image
== NULL
|| width
!= this->width
|| height
!= this->height
) )
301 mlt_pool_release( this->image_release
);
302 mlt_pool_release( this->alpha_release
);
303 this->image_release
= NULL
;
304 this->alpha_release
= NULL
;
308 pixbuf
= mlt_properties_get_data( producer_props
, "pixbuf", NULL
);
311 // If we have a pixbuf and a valid width
312 if ( pixbuf
&& width
> 0 )
314 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
315 int interp
= GDK_INTERP_BILINEAR
;
317 if ( strcmp( interps
, "nearest" ) == 0 )
318 interp
= GDK_INTERP_NEAREST
;
319 else if ( strcmp( interps
, "tiles" ) == 0 )
320 interp
= GDK_INTERP_TILES
;
321 else if ( strcmp( interps
, "hyper" ) == 0 )
322 interp
= GDK_INTERP_HYPER
;
324 // 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 );
326 // Note - the original pixbuf is already safe and ready for destruction
327 pixbuf
= gdk_pixbuf_scale_simple( pixbuf
, width
, height
, interp
);
329 // Store width and height
331 this->height
= height
;
333 // Allocate/define image
334 this->image
= mlt_pool_allocate( width
* ( height
+ 1 ) * 2, &this->image_release
);
335 this->alpha
= mlt_pool_allocate( this->width
* this->height
, &this->alpha_release
);
338 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
339 this->width
, this->height
,
340 gdk_pixbuf_get_rowstride( pixbuf
),
341 this->image
, this->alpha
);
343 // Finished with pixbuf now
344 g_object_unref( pixbuf
);
348 mlt_properties_set_int( properties
, "width", this->width
);
349 mlt_properties_set_int( properties
, "height", this->height
);
350 mlt_properties_set_int( properties
, "real_width", mlt_properties_get_int( producer_props
, "real_width" ) );
351 mlt_properties_set_int( properties
, "real_height", mlt_properties_get_int( producer_props
, "real_height" ) );
353 // pass the image data without destructor
354 mlt_properties_set_data( properties
, "image", this->image
, this->width
* ( this->height
+ 1 ) * 2, NULL
, NULL
);
355 mlt_properties_set_data( properties
, "alpha", this->alpha
, this->width
* this->height
, NULL
, NULL
);
358 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
360 // Obtain properties of frame
361 mlt_properties properties
= mlt_frame_properties( frame
);
363 *width
= mlt_properties_get_int( properties
, "rescale_width" );
364 *height
= mlt_properties_get_int( properties
, "rescale_height" );
367 refresh_image( frame
, *width
, *height
);
370 //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
371 //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
373 // May need to know the size of the image to clone it
377 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
379 // Get width and height
380 *width
= mlt_properties_get_int( properties
, "width" );
381 *height
= mlt_properties_get_int( properties
, "height" );
383 // Clone if necessary
387 void *release
= NULL
;
388 uint8_t *copy
= mlt_pool_allocate( size
, &release
);
389 memcpy( copy
, image
, size
);
391 // We're going to pass the copy on
394 // Now update properties so we free the copy after
395 mlt_properties_set_data( properties
, "image_release", release
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
396 mlt_properties_set_data( properties
, "image", copy
, size
, NULL
, NULL
);
405 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
407 // Obtain properties of frame
408 mlt_properties properties
= mlt_frame_properties( this );
410 // Return the alpha mask
411 return mlt_properties_get_data( properties
, "alpha", NULL
);
414 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
416 producer_pango
this = producer
->child
;
419 *frame
= mlt_frame_init( );
421 // Obtain properties of frame and producer
422 mlt_properties properties
= mlt_frame_properties( *frame
);
424 // Set the producer on the frame properties
425 mlt_properties_set_data( properties
, "producer_pango", this, 0, NULL
, NULL
);
427 // Refresh the pango image
428 refresh_image( *frame
, 0, 0 );
430 // Set producer-specific frame properties
431 mlt_properties_set_int( properties
, "progressive", 1 );
432 mlt_properties_set_double( properties
, "aspect_ratio", mlt_properties_get_double( properties
, "real_width" ) / mlt_properties_get_double( properties
, "real_height" ) );
434 // Set alpha call back
435 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
437 // Stack the get image callback
438 mlt_frame_push_get_image( *frame
, producer_get_image
);
440 // Update timecode on the frame we're creating
441 mlt_frame_set_position( *frame
, mlt_producer_position( producer
) );
443 // Calculate the next timecode
444 mlt_producer_prepare_next( producer
);
449 static void producer_close( mlt_producer parent
)
451 producer_pango
this = parent
->child
;
452 mlt_pool_release( this->image_release
);
453 mlt_pool_release( this->alpha_release
);
454 free( this->fgcolor
);
455 free( this->bgcolor
);
456 free( this->markup
);
459 parent
->close
= NULL
;
460 mlt_producer_close( parent
);
464 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
)
466 int ww
= gdk_pixbuf_get_width( pixbuf
);
467 int hh
= gdk_pixbuf_get_height( pixbuf
);
468 uint8_t *p
= gdk_pixbuf_get_pixels( pixbuf
);
471 for ( j
= 0; j
< hh
; j
++ )
473 for ( i
= 0; i
< ww
; i
++ )
483 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
, rgba_color fg
, rgba_color bg
, int pad
, int align
)
485 PangoFT2FontMap
*fontmap
= (PangoFT2FontMap
*) pango_ft2_font_map_new();
486 PangoContext
*context
= pango_ft2_font_map_create_context( fontmap
);
487 PangoLayout
*layout
= pango_layout_new( context
);
490 GdkPixbuf
*pixbuf
= NULL
;
493 uint8_t* dest
= NULL
;
495 void *release
= NULL
;
497 pango_ft2_font_map_set_resolution( fontmap
, 72, 72 );
498 pango_layout_set_width( layout
, -1 ); // set wrapping constraints
499 pango_layout_set_font_description( layout
, pango_font_description_from_string( font
) );
500 // pango_layout_set_spacing( layout, space );
501 pango_layout_set_alignment( layout
, ( PangoAlignment
) align
);
502 if ( markup
!= NULL
&& strcmp( markup
, "" ) != 0 )
503 pango_layout_set_markup( layout
, markup
, strlen( markup
) );
504 else if ( text
!= NULL
&& strcmp( text
, "" ) != 0 )
505 pango_layout_set_text( layout
, text
, strlen( text
) );
508 pango_layout_get_pixel_size( layout
, &w
, &h
);
510 pixbuf
= gdk_pixbuf_new( GDK_COLORSPACE_RGB
, TRUE
/* has alpha */, 8, w
+ 2 * pad
, h
+ 2 * pad
);
511 pango_draw_background( pixbuf
, bg
);
513 stride
= gdk_pixbuf_get_rowstride( pixbuf
);
516 bitmap
.pitch
= 32 * ( ( w
+ 31 ) / 31 );
518 bitmap
.buffer
= mlt_pool_allocate( h
* bitmap
.pitch
, &release
);
519 bitmap
.num_grays
= 256;
520 bitmap
.pixel_mode
= ft_pixel_mode_grays
;
522 memset( bitmap
.buffer
, 0, h
* bitmap
.pitch
);
524 pango_ft2_render_layout( &bitmap
, layout
, 0, 0 );
527 x
= ( gdk_pixbuf_get_width( pixbuf
) - w
- 2 * pad
) * align
/ 2 + pad
;
528 dest
= gdk_pixbuf_get_pixels( pixbuf
) + 4 * x
+ pad
* stride
;
529 for ( j
= 0; j
< h
; j
++ )
532 for ( i
= 0; i
< w
; i
++ )
534 float a
= ( float ) bitmap
.buffer
[ j
* bitmap
.pitch
+ i
] / 255.0;
535 *d
++ = ( int ) ( a
* fg
.r
+ ( 1 - a
) * bg
.r
);
536 *d
++ = ( int ) ( a
* fg
.g
+ ( 1 - a
) * bg
.g
);
537 *d
++ = ( int ) ( a
* fg
.b
+ ( 1 - a
) * bg
.b
);
538 *d
++ = ( int ) ( a
* fg
.a
+ ( 1 - a
) * bg
.a
);
542 mlt_pool_release( release
);
543 g_object_unref( layout
);
544 g_object_unref( context
);
545 g_object_unref( fontmap
);