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
;
45 // special color type used by internal pango routines
51 // Forward declarations
52 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int index
);
53 static void producer_close( mlt_producer parent
);
54 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
);
55 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
,
56 rgba_color fg
, rgba_color bg
, int pad
, int align
);
58 /** Parse the alignment property.
61 static int alignment_parse( char* align
)
63 int ret
= pango_align_left
;
66 else if ( isdigit( align
[ 0 ] ) )
68 else if ( align
[ 0 ] == 'c' || align
[ 0 ] == 'm' )
69 ret
= pango_align_center
;
70 else if ( align
[ 0 ] == 'r' )
71 ret
= pango_align_right
;
76 mlt_producer
producer_pango_init( const char *filename
)
78 producer_pango
this = calloc( sizeof( struct producer_pango_s
), 1 );
79 if ( this != NULL
&& mlt_producer_init( &this->parent
, this ) == 0 )
81 mlt_producer producer
= &this->parent
;
83 producer
->get_frame
= producer_get_frame
;
84 producer
->close
= producer_close
;
86 // This is required to initialise gdk-pixbuf
89 // Get the properties interface
90 mlt_properties properties
= mlt_producer_properties( &this->parent
);
92 // Set the default properties
93 mlt_properties_set( properties
, "fgcolour", "0xffffffff" );
94 mlt_properties_set( properties
, "bgcolour", "0x00000000" );
95 mlt_properties_set_int( properties
, "align", pango_align_left
);
96 mlt_properties_set_int( properties
, "pad", 0 );
97 mlt_properties_set( properties
, "text", "" );
98 mlt_properties_set( properties
, "font", "Sans 48" );
100 if ( filename
== NULL
)
102 mlt_properties_set( properties
, "markup", "" );
104 else if ( filename
[ 0 ] == '+' || strstr( filename
, "/+" ) )
106 char *copy
= strdup( filename
+ 1 );
108 if ( strstr( markup
, "/+" ) )
109 markup
= strstr( markup
, "/+" ) + 2;
110 ( *strrchr( markup
, '.' ) ) = '\0';
111 while ( strchr( markup
, '~' ) )
112 ( *strchr( markup
, '~' ) ) = '\n';
113 mlt_properties_set( properties
, "resource", ( char * )filename
);
114 mlt_properties_set( properties
, "markup", markup
);
119 FILE *f
= fopen( filename
, "r" );
127 while ( fgets( line
, 80, f
) )
129 size
+= strlen( line
) + 1;
132 markup
= realloc( markup
, size
);
133 strcat( markup
, line
);
137 markup
= strdup( line
);
142 if ( markup
[ strlen( markup
) - 1 ] == '\n' )
143 markup
[ strlen( markup
) - 1 ] = '\0';
145 mlt_properties_set( properties
, "resource", ( char * ) filename
);
146 mlt_properties_set( properties
, "markup", ( char * ) ( markup
== NULL ?
"" : markup
) );
151 mlt_properties_set( properties
, "markup", "" );
161 static void set_string( char **string
, char *value
, char *fallback
)
166 *string
= strdup( value
);
168 else if ( *string
== NULL
&& fallback
!= NULL
)
170 *string
= strdup( fallback
);
172 else if ( *string
!= NULL
&& fallback
== NULL
)
179 rgba_color
parse_color( char *color
)
181 rgba_color result
= { 0xff, 0xff, 0xff, 0xff };
183 if ( !strncmp( color
, "0x", 2 ) )
185 unsigned int temp
= 0;
186 sscanf( color
+ 2, "%x", &temp
);
187 result
.r
= ( temp
>> 24 ) & 0xff;
188 result
.g
= ( temp
>> 16 ) & 0xff;
189 result
.b
= ( temp
>> 8 ) & 0xff;
190 result
.a
= ( temp
) & 0xff;
192 else if ( !strcmp( color
, "red" ) )
198 else if ( !strcmp( color
, "green" ) )
204 else if ( !strcmp( color
, "blue" ) )
212 unsigned int temp
= 0;
213 sscanf( color
, "%d", &temp
);
214 result
.r
= ( temp
>> 24 ) & 0xff;
215 result
.g
= ( temp
>> 16 ) & 0xff;
216 result
.b
= ( temp
>> 8 ) & 0xff;
217 result
.a
= ( temp
) & 0xff;
223 static void refresh_image( mlt_frame frame
, int width
, int height
)
226 GdkPixbuf
*pixbuf
= NULL
;
228 // Obtain properties of frame
229 mlt_properties properties
= mlt_frame_properties( frame
);
231 // Obtain the producer pango for this frame
232 producer_pango
this = mlt_properties_get_data( properties
, "producer_pango", NULL
);
234 // Obtain the producer
235 mlt_producer producer
= &this->parent
;
237 // Obtain the producer properties
238 mlt_properties producer_props
= mlt_producer_properties( producer
);
240 // Get producer properties
241 char *fg
= mlt_properties_get( producer_props
, "fgcolour" );
242 char *bg
= mlt_properties_get( producer_props
, "bgcolour" );
243 int align
= alignment_parse( mlt_properties_get( producer_props
, "align" ) );
244 int pad
= mlt_properties_get_int( producer_props
, "pad" );
245 char *markup
= mlt_properties_get( producer_props
, "markup" );
246 char *text
= mlt_properties_get( producer_props
, "text" );
247 char *font
= mlt_properties_get( producer_props
, "font" );
249 // See if any properties changed
250 int property_changed
= ( align
!= this->align
);
251 property_changed
= property_changed
|| ( this->fgcolor
== NULL
|| ( fg
&& strcmp( fg
, this->fgcolor
) ) );
252 property_changed
= property_changed
|| ( this->bgcolor
== NULL
|| ( bg
&& strcmp( bg
, this->bgcolor
) ) );
253 property_changed
= property_changed
|| ( pad
!= this->pad
);
254 property_changed
= property_changed
|| ( markup
&& this->markup
&& strcmp( markup
, this->markup
) );
255 property_changed
= property_changed
|| ( text
&& this->text
&& strcmp( text
, this->text
) );
256 property_changed
= property_changed
|| ( font
&& this->font
&& strcmp( font
, this->font
) );
258 // Save the properties for next comparison
261 set_string( &this->fgcolor
, fg
, "0xffffffff" );
262 set_string( &this->bgcolor
, bg
, "0x00000000" );
263 set_string( &this->markup
, markup
, NULL
);
264 set_string( &this->text
, text
, NULL
);
265 set_string( &this->font
, font
, "Sans 48" );
267 if ( property_changed
)
269 rgba_color fgcolor
= parse_color( this->fgcolor
);
270 rgba_color bgcolor
= parse_color( this->bgcolor
);
272 mlt_pool_release( this->image
);
273 mlt_pool_release( this->alpha
);
278 pixbuf
= pango_get_pixbuf( markup
, text
, font
, fgcolor
, bgcolor
, pad
, align
);
280 if ( pixbuf
!= NULL
)
282 // Register this pixbuf for destruction and reuse
283 mlt_properties_set_data( producer_props
, "pixbuf", pixbuf
, 0, ( mlt_destructor
)g_object_unref
, NULL
);
285 mlt_properties_set_int( producer_props
, "real_width", gdk_pixbuf_get_width( pixbuf
) );
286 mlt_properties_set_int( producer_props
, "real_height", gdk_pixbuf_get_height( pixbuf
) );
288 // Store the width/height of the pixbuf temporarily
289 this->width
= gdk_pixbuf_get_width( pixbuf
);
290 this->height
= gdk_pixbuf_get_height( pixbuf
);
293 else if ( width
> 0 && ( this->image
== NULL
|| width
!= this->width
|| height
!= this->height
) )
295 mlt_pool_release( this->image
);
296 mlt_pool_release( this->alpha
);
300 pixbuf
= mlt_properties_get_data( producer_props
, "pixbuf", NULL
);
303 // If we have a pixbuf and a valid width
304 if ( pixbuf
&& width
> 0 )
306 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
307 int interp
= GDK_INTERP_BILINEAR
;
309 if ( strcmp( interps
, "nearest" ) == 0 )
310 interp
= GDK_INTERP_NEAREST
;
311 else if ( strcmp( interps
, "tiles" ) == 0 )
312 interp
= GDK_INTERP_TILES
;
313 else if ( strcmp( interps
, "hyper" ) == 0 )
314 interp
= GDK_INTERP_HYPER
;
316 // 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 );
318 // Note - the original pixbuf is already safe and ready for destruction
319 pixbuf
= gdk_pixbuf_scale_simple( pixbuf
, width
, height
, interp
);
321 // Store width and height
323 this->height
= height
;
325 // Allocate/define image
326 this->image
= mlt_pool_alloc( width
* ( height
+ 1 ) * 2 );
327 this->alpha
= mlt_pool_alloc( this->width
* this->height
);
330 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
331 this->width
, this->height
,
332 gdk_pixbuf_get_rowstride( pixbuf
),
333 this->image
, this->alpha
);
335 // Finished with pixbuf now
336 g_object_unref( pixbuf
);
340 mlt_properties_set_int( properties
, "width", this->width
);
341 mlt_properties_set_int( properties
, "height", this->height
);
342 mlt_properties_set_int( properties
, "real_width", mlt_properties_get_int( producer_props
, "real_width" ) );
343 mlt_properties_set_int( properties
, "real_height", mlt_properties_get_int( producer_props
, "real_height" ) );
345 // pass the image data without destructor
346 mlt_properties_set_data( properties
, "image", this->image
, this->width
* ( this->height
+ 1 ) * 2, NULL
, NULL
);
347 mlt_properties_set_data( properties
, "alpha", this->alpha
, this->width
* this->height
, NULL
, NULL
);
350 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
352 // Obtain properties of frame
353 mlt_properties properties
= mlt_frame_properties( frame
);
355 *width
= mlt_properties_get_int( properties
, "rescale_width" );
356 *height
= mlt_properties_get_int( properties
, "rescale_height" );
359 refresh_image( frame
, *width
, *height
);
362 //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
363 //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
365 // May need to know the size of the image to clone it
369 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
371 // Get width and height
372 *width
= mlt_properties_get_int( properties
, "width" );
373 *height
= mlt_properties_get_int( properties
, "height" );
375 // Clone if necessary
379 uint8_t *copy
= mlt_pool_alloc( size
);
380 memcpy( copy
, image
, size
);
382 // We're going to pass the copy on
385 // Now update properties so we free the copy after
386 mlt_properties_set_data( properties
, "image", copy
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
395 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
397 // Obtain properties of frame
398 mlt_properties properties
= mlt_frame_properties( this );
400 // Return the alpha mask
401 return mlt_properties_get_data( properties
, "alpha", NULL
);
404 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
406 producer_pango
this = producer
->child
;
409 *frame
= mlt_frame_init( );
411 // Obtain properties of frame and producer
412 mlt_properties properties
= mlt_frame_properties( *frame
);
414 // Set the producer on the frame properties
415 mlt_properties_set_data( properties
, "producer_pango", this, 0, NULL
, NULL
);
417 // Refresh the pango image
418 refresh_image( *frame
, 0, 0 );
420 // Set producer-specific frame properties
421 mlt_properties_set_int( properties
, "progressive", 1 );
422 mlt_properties_set_double( properties
, "aspect_ratio", mlt_properties_get_double( properties
, "real_width" ) / mlt_properties_get_double( properties
, "real_height" ) );
424 // Set alpha call back
425 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
427 // Stack the get image callback
428 mlt_frame_push_get_image( *frame
, producer_get_image
);
430 // Update timecode on the frame we're creating
431 mlt_frame_set_position( *frame
, mlt_producer_position( producer
) );
433 // Calculate the next timecode
434 mlt_producer_prepare_next( producer
);
439 static void producer_close( mlt_producer parent
)
441 producer_pango
this = parent
->child
;
442 mlt_pool_release( this->image
);
443 mlt_pool_release( this->alpha
);
444 free( this->fgcolor
);
445 free( this->bgcolor
);
446 free( this->markup
);
449 parent
->close
= NULL
;
450 mlt_producer_close( parent
);
454 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
)
456 int ww
= gdk_pixbuf_get_width( pixbuf
);
457 int hh
= gdk_pixbuf_get_height( pixbuf
);
458 uint8_t *p
= gdk_pixbuf_get_pixels( pixbuf
);
461 for ( j
= 0; j
< hh
; j
++ )
463 for ( i
= 0; i
< ww
; i
++ )
473 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
, rgba_color fg
, rgba_color bg
, int pad
, int align
)
475 PangoFT2FontMap
*fontmap
= (PangoFT2FontMap
*) pango_ft2_font_map_new();
476 PangoContext
*context
= pango_ft2_font_map_create_context( fontmap
);
477 PangoLayout
*layout
= pango_layout_new( context
);
480 GdkPixbuf
*pixbuf
= NULL
;
483 uint8_t* dest
= NULL
;
486 pango_ft2_font_map_set_resolution( fontmap
, 72, 72 );
487 pango_layout_set_width( layout
, -1 ); // set wrapping constraints
488 pango_layout_set_font_description( layout
, pango_font_description_from_string( font
) );
489 // pango_layout_set_spacing( layout, space );
490 pango_layout_set_alignment( layout
, ( PangoAlignment
) align
);
491 if ( markup
!= NULL
&& strcmp( markup
, "" ) != 0 )
492 pango_layout_set_markup( layout
, markup
, strlen( markup
) );
493 else if ( text
!= NULL
&& strcmp( text
, "" ) != 0 )
494 pango_layout_set_text( layout
, text
, strlen( text
) );
497 pango_layout_get_pixel_size( layout
, &w
, &h
);
499 pixbuf
= gdk_pixbuf_new( GDK_COLORSPACE_RGB
, TRUE
/* has alpha */, 8, w
+ 2 * pad
, h
+ 2 * pad
);
500 pango_draw_background( pixbuf
, bg
);
502 stride
= gdk_pixbuf_get_rowstride( pixbuf
);
505 bitmap
.pitch
= 32 * ( ( w
+ 31 ) / 31 );
507 bitmap
.buffer
= mlt_pool_alloc( h
* bitmap
.pitch
);
508 bitmap
.num_grays
= 256;
509 bitmap
.pixel_mode
= ft_pixel_mode_grays
;
511 memset( bitmap
.buffer
, 0, h
* bitmap
.pitch
);
513 pango_ft2_render_layout( &bitmap
, layout
, 0, 0 );
516 x
= ( gdk_pixbuf_get_width( pixbuf
) - w
- 2 * pad
) * align
/ 2 + pad
;
517 dest
= gdk_pixbuf_get_pixels( pixbuf
) + 4 * x
+ pad
* stride
;
518 for ( j
= 0; j
< h
; j
++ )
521 for ( i
= 0; i
< w
; i
++ )
523 float a
= ( float ) bitmap
.buffer
[ j
* bitmap
.pitch
+ i
] / 255.0;
524 *d
++ = ( int ) ( a
* fg
.r
+ ( 1 - a
) * bg
.r
);
525 *d
++ = ( int ) ( a
* fg
.g
+ ( 1 - a
) * bg
.g
);
526 *d
++ = ( int ) ( a
* fg
.b
+ ( 1 - a
) * bg
.b
);
527 *d
++ = ( int ) ( a
* fg
.a
+ ( 1 - a
) * bg
.a
);
531 mlt_pool_release( bitmap
.buffer
);
532 g_object_unref( layout
);
533 g_object_unref( context
);
534 g_object_unref( fontmap
);