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>
30 struct producer_pango_s
32 struct mlt_producer_s parent
;
46 // special color type used by internal pango routines
52 // Forward declarations
53 static int producer_get_frame( mlt_producer parent
, mlt_frame_ptr frame
, int index
);
54 static void producer_close( mlt_producer parent
);
55 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
);
56 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
,
57 rgba_color fg
, rgba_color bg
, int pad
, int align
);
59 /** Return nonzero if the two strings are equal, ignoring case, up to
60 the first n characters.
62 int strncaseeq(const char *s1
, const char *s2
, size_t n
)
66 if (tolower(*s1
++) != tolower(*s2
++))
72 /** Parse the alignment property.
75 static int alignment_parse( char* align
)
77 int ret
= pango_align_left
;
80 else if ( isdigit( align
[ 0 ] ) )
82 else if ( align
[ 0 ] == 'c' || align
[ 0 ] == 'm' )
83 ret
= pango_align_center
;
84 else if ( align
[ 0 ] == 'r' )
85 ret
= pango_align_right
;
90 mlt_producer
producer_pango_init( const char *filename
)
92 producer_pango
this = calloc( sizeof( struct producer_pango_s
), 1 );
93 if ( this != NULL
&& mlt_producer_init( &this->parent
, this ) == 0 )
95 mlt_producer producer
= &this->parent
;
97 producer
->get_frame
= producer_get_frame
;
98 producer
->close
= producer_close
;
100 // This is required to initialise gdk-pixbuf
103 // Get the properties interface
104 mlt_properties properties
= mlt_producer_properties( &this->parent
);
106 // Set the default properties
107 mlt_properties_set( properties
, "fgcolour", "0xffffffff" );
108 mlt_properties_set( properties
, "bgcolour", "0x00000000" );
109 mlt_properties_set_int( properties
, "align", pango_align_left
);
110 mlt_properties_set_int( properties
, "pad", 0 );
111 mlt_properties_set( properties
, "text", "" );
112 mlt_properties_set( properties
, "font", "Sans 48" );
113 mlt_properties_set( properties
, "encoding", "UTF-8" );
115 if ( filename
== NULL
)
117 mlt_properties_set( properties
, "markup", "" );
119 else if ( filename
[ 0 ] == '+' || strstr( filename
, "/+" ) )
121 char *copy
= strdup( filename
+ 1 );
123 if ( strstr( markup
, "/+" ) )
124 markup
= strstr( markup
, "/+" ) + 2;
125 ( *strrchr( markup
, '.' ) ) = '\0';
126 while ( strchr( markup
, '~' ) )
127 ( *strchr( markup
, '~' ) ) = '\n';
128 mlt_properties_set( properties
, "resource", ( char * )filename
);
129 mlt_properties_set( properties
, "markup", markup
);
134 FILE *f
= fopen( filename
, "r" );
142 while ( fgets( line
, 80, f
) )
144 size
+= strlen( line
) + 1;
147 markup
= realloc( markup
, size
);
148 strcat( markup
, line
);
152 markup
= strdup( line
);
157 if ( markup
[ strlen( markup
) - 1 ] == '\n' )
158 markup
[ strlen( markup
) - 1 ] = '\0';
160 mlt_properties_set( properties
, "resource", ( char * ) filename
);
161 mlt_properties_set( properties
, "markup", ( char * ) ( markup
== NULL ?
"" : markup
) );
166 mlt_properties_set( properties
, "markup", "" );
176 static void set_string( char **string
, char *value
, char *fallback
)
181 *string
= strdup( value
);
183 else if ( *string
== NULL
&& fallback
!= NULL
)
185 *string
= strdup( fallback
);
187 else if ( *string
!= NULL
&& fallback
== NULL
)
194 rgba_color
parse_color( char *color
)
196 rgba_color result
= { 0xff, 0xff, 0xff, 0xff };
198 if ( !strncmp( color
, "0x", 2 ) )
200 unsigned int temp
= 0;
201 sscanf( color
+ 2, "%x", &temp
);
202 result
.r
= ( temp
>> 24 ) & 0xff;
203 result
.g
= ( temp
>> 16 ) & 0xff;
204 result
.b
= ( temp
>> 8 ) & 0xff;
205 result
.a
= ( temp
) & 0xff;
207 else if ( !strcmp( color
, "red" ) )
213 else if ( !strcmp( color
, "green" ) )
219 else if ( !strcmp( color
, "blue" ) )
227 unsigned int temp
= 0;
228 sscanf( color
, "%d", &temp
);
229 result
.r
= ( temp
>> 24 ) & 0xff;
230 result
.g
= ( temp
>> 16 ) & 0xff;
231 result
.b
= ( temp
>> 8 ) & 0xff;
232 result
.a
= ( temp
) & 0xff;
238 /** Convert a string property to UTF-8
240 static int iconv_utf8( mlt_properties properties
, char *prop_name
, const char* encoding
)
242 char *text
= mlt_properties_get( properties
, prop_name
);
245 iconv_t cd
= iconv_open( "UTF-8", encoding
);
246 if ( cd
!= ( iconv_t
)-1 )
248 char *inbuf_p
= strdup( text
);
249 size_t inbuf_n
= strlen( text
);
250 size_t outbuf_n
= inbuf_n
* 6;
251 char *outbuf
= mlt_pool_alloc( outbuf_n
);
252 char *outbuf_p
= outbuf
;
254 if ( iconv( cd
, &inbuf_p
, &inbuf_n
, &outbuf_p
, &outbuf_n
) != -1 )
256 outbuf
[ outbuf_n
] = 0;
257 mlt_properties_set( properties
, prop_name
, outbuf
);
260 mlt_pool_release( outbuf
);
266 static void refresh_image( mlt_frame frame
, int width
, int height
)
269 GdkPixbuf
*pixbuf
= NULL
;
271 // Obtain properties of frame
272 mlt_properties properties
= mlt_frame_properties( frame
);
274 // Obtain the producer pango for this frame
275 producer_pango
this = mlt_properties_get_data( properties
, "producer_pango", NULL
);
277 // Obtain the producer
278 mlt_producer producer
= &this->parent
;
280 // Obtain the producer properties
281 mlt_properties producer_props
= mlt_producer_properties( producer
);
283 // Get producer properties
284 char *fg
= mlt_properties_get( producer_props
, "fgcolour" );
285 char *bg
= mlt_properties_get( producer_props
, "bgcolour" );
286 int align
= alignment_parse( mlt_properties_get( producer_props
, "align" ) );
287 int pad
= mlt_properties_get_int( producer_props
, "pad" );
288 char *markup
= mlt_properties_get( producer_props
, "markup" );
289 char *text
= mlt_properties_get( producer_props
, "text" );
290 char *font
= mlt_properties_get( producer_props
, "font" );
291 char *encoding
= mlt_properties_get( producer_props
, "encoding" );
293 // See if any properties changed
294 int property_changed
= ( align
!= this->align
);
295 property_changed
= property_changed
|| ( this->fgcolor
== NULL
|| ( fg
&& strcmp( fg
, this->fgcolor
) ) );
296 property_changed
= property_changed
|| ( this->bgcolor
== NULL
|| ( bg
&& strcmp( bg
, this->bgcolor
) ) );
297 property_changed
= property_changed
|| ( pad
!= this->pad
);
298 property_changed
= property_changed
|| ( markup
&& this->markup
&& strcmp( markup
, this->markup
) );
299 property_changed
= property_changed
|| ( text
&& this->text
&& strcmp( text
, this->text
) );
300 property_changed
= property_changed
|| ( font
&& this->font
&& strcmp( font
, this->font
) );
302 // Save the properties for next comparison
305 set_string( &this->fgcolor
, fg
, "0xffffffff" );
306 set_string( &this->bgcolor
, bg
, "0x00000000" );
307 set_string( &this->markup
, markup
, NULL
);
308 set_string( &this->text
, text
, NULL
);
309 set_string( &this->font
, font
, "Sans 48" );
311 if ( property_changed
)
313 rgba_color fgcolor
= parse_color( this->fgcolor
);
314 rgba_color bgcolor
= parse_color( this->bgcolor
);
316 mlt_pool_release( this->image
);
317 mlt_pool_release( this->alpha
);
321 // Convert from specified encoding to UTF-8
322 if ( encoding
!= NULL
&& !strncaseeq( encoding
, "utf-8", 5 ) && !strncaseeq( encoding
, "utf8", 4 ) )
324 if ( markup
!= NULL
&& iconv_utf8( producer_props
, "markup", encoding
) != -1 )
326 markup
= mlt_properties_get( producer_props
, "markup" );
327 set_string( &this->markup
, markup
, NULL
);
329 if ( text
!= NULL
&& iconv_utf8( producer_props
, "text", encoding
) != -1 )
331 text
= mlt_properties_get( producer_props
, "text" );
332 set_string( &this->text
, text
, NULL
);
337 pixbuf
= pango_get_pixbuf( markup
, text
, font
, fgcolor
, bgcolor
, pad
, align
);
339 if ( pixbuf
!= NULL
)
341 // Register this pixbuf for destruction and reuse
342 mlt_properties_set_data( producer_props
, "pixbuf", pixbuf
, 0, ( mlt_destructor
)g_object_unref
, NULL
);
344 mlt_properties_set_int( producer_props
, "real_width", gdk_pixbuf_get_width( pixbuf
) );
345 mlt_properties_set_int( producer_props
, "real_height", gdk_pixbuf_get_height( pixbuf
) );
347 // Store the width/height of the pixbuf temporarily
348 this->width
= gdk_pixbuf_get_width( pixbuf
);
349 this->height
= gdk_pixbuf_get_height( pixbuf
);
352 else if ( width
> 0 && ( this->image
== NULL
|| width
!= this->width
|| height
!= this->height
) )
354 mlt_pool_release( this->image
);
355 mlt_pool_release( this->alpha
);
359 pixbuf
= mlt_properties_get_data( producer_props
, "pixbuf", NULL
);
362 // If we have a pixbuf and a valid width
363 if ( pixbuf
&& width
> 0 )
365 char *interps
= mlt_properties_get( properties
, "rescale.interp" );
366 int interp
= GDK_INTERP_BILINEAR
;
368 if ( strcmp( interps
, "nearest" ) == 0 )
369 interp
= GDK_INTERP_NEAREST
;
370 else if ( strcmp( interps
, "tiles" ) == 0 )
371 interp
= GDK_INTERP_TILES
;
372 else if ( strcmp( interps
, "hyper" ) == 0 )
373 interp
= GDK_INTERP_HYPER
;
375 // 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 );
377 // Note - the original pixbuf is already safe and ready for destruction
378 pixbuf
= gdk_pixbuf_scale_simple( pixbuf
, width
, height
, interp
);
380 // Store width and height
382 this->height
= height
;
384 // Allocate/define image
385 this->image
= mlt_pool_alloc( width
* ( height
+ 1 ) * 2 );
386 this->alpha
= mlt_pool_alloc( this->width
* this->height
);
389 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
390 this->width
, this->height
,
391 gdk_pixbuf_get_rowstride( pixbuf
),
392 this->image
, this->alpha
);
394 // Finished with pixbuf now
395 g_object_unref( pixbuf
);
399 mlt_properties_set_int( properties
, "width", this->width
);
400 mlt_properties_set_int( properties
, "height", this->height
);
401 mlt_properties_set_int( properties
, "real_width", mlt_properties_get_int( producer_props
, "real_width" ) );
402 mlt_properties_set_int( properties
, "real_height", mlt_properties_get_int( producer_props
, "real_height" ) );
404 // pass the image data without destructor
405 mlt_properties_set_data( properties
, "image", this->image
, this->width
* ( this->height
+ 1 ) * 2, NULL
, NULL
);
406 mlt_properties_set_data( properties
, "alpha", this->alpha
, this->width
* this->height
, NULL
, NULL
);
409 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
411 // Obtain properties of frame
412 mlt_properties properties
= mlt_frame_properties( frame
);
414 *width
= mlt_properties_get_int( properties
, "rescale_width" );
415 *height
= mlt_properties_get_int( properties
, "rescale_height" );
418 refresh_image( frame
, *width
, *height
);
421 //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
422 //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
424 // May need to know the size of the image to clone it
428 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
430 // Get width and height
431 *width
= mlt_properties_get_int( properties
, "width" );
432 *height
= mlt_properties_get_int( properties
, "height" );
434 // Clone if necessary
438 uint8_t *copy
= mlt_pool_alloc( size
);
439 memcpy( copy
, image
, size
);
441 // We're going to pass the copy on
444 // Now update properties so we free the copy after
445 mlt_properties_set_data( properties
, "image", copy
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
454 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
456 // Obtain properties of frame
457 mlt_properties properties
= mlt_frame_properties( this );
459 // Return the alpha mask
460 return mlt_properties_get_data( properties
, "alpha", NULL
);
463 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
465 producer_pango
this = producer
->child
;
468 *frame
= mlt_frame_init( );
470 // Obtain properties of frame and producer
471 mlt_properties properties
= mlt_frame_properties( *frame
);
473 // Set the producer on the frame properties
474 mlt_properties_set_data( properties
, "producer_pango", this, 0, NULL
, NULL
);
476 // Refresh the pango image
477 refresh_image( *frame
, 0, 0 );
479 // Set producer-specific frame properties
480 mlt_properties_set_int( properties
, "progressive", 1 );
481 mlt_properties_set_double( properties
, "aspect_ratio", 1 );
483 // Set alpha call back
484 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
486 // Stack the get image callback
487 mlt_frame_push_get_image( *frame
, producer_get_image
);
489 // Update timecode on the frame we're creating
490 mlt_frame_set_position( *frame
, mlt_producer_position( producer
) );
492 // Calculate the next timecode
493 mlt_producer_prepare_next( producer
);
498 static void producer_close( mlt_producer parent
)
500 producer_pango
this = parent
->child
;
501 mlt_pool_release( this->image
);
502 mlt_pool_release( this->alpha
);
503 free( this->fgcolor
);
504 free( this->bgcolor
);
505 free( this->markup
);
508 parent
->close
= NULL
;
509 mlt_producer_close( parent
);
513 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
)
515 int ww
= gdk_pixbuf_get_width( pixbuf
);
516 int hh
= gdk_pixbuf_get_height( pixbuf
);
517 uint8_t *p
= gdk_pixbuf_get_pixels( pixbuf
);
520 for ( j
= 0; j
< hh
; j
++ )
522 for ( i
= 0; i
< ww
; i
++ )
532 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
, rgba_color fg
, rgba_color bg
, int pad
, int align
)
534 PangoFT2FontMap
*fontmap
= (PangoFT2FontMap
*) pango_ft2_font_map_new();
535 PangoContext
*context
= pango_ft2_font_map_create_context( fontmap
);
536 PangoLayout
*layout
= pango_layout_new( context
);
539 GdkPixbuf
*pixbuf
= NULL
;
542 uint8_t* dest
= NULL
;
545 pango_ft2_font_map_set_resolution( fontmap
, 72, 72 );
546 pango_layout_set_width( layout
, -1 ); // set wrapping constraints
547 pango_layout_set_font_description( layout
, pango_font_description_from_string( font
) );
548 // pango_layout_set_spacing( layout, space );
549 pango_layout_set_alignment( layout
, ( PangoAlignment
) align
);
550 if ( markup
!= NULL
&& strcmp( markup
, "" ) != 0 )
551 pango_layout_set_markup( layout
, markup
, strlen( markup
) );
552 else if ( text
!= NULL
&& strcmp( text
, "" ) != 0 )
553 pango_layout_set_text( layout
, text
, strlen( text
) );
556 pango_layout_get_pixel_size( layout
, &w
, &h
);
558 pixbuf
= gdk_pixbuf_new( GDK_COLORSPACE_RGB
, TRUE
/* has alpha */, 8, w
+ 2 * pad
, h
+ 2 * pad
);
559 pango_draw_background( pixbuf
, bg
);
561 stride
= gdk_pixbuf_get_rowstride( pixbuf
);
564 bitmap
.pitch
= 32 * ( ( w
+ 31 ) / 31 );
566 bitmap
.buffer
= mlt_pool_alloc( h
* bitmap
.pitch
);
567 bitmap
.num_grays
= 256;
568 bitmap
.pixel_mode
= ft_pixel_mode_grays
;
570 memset( bitmap
.buffer
, 0, h
* bitmap
.pitch
);
572 pango_ft2_render_layout( &bitmap
, layout
, 0, 0 );
575 x
= ( gdk_pixbuf_get_width( pixbuf
) - w
- 2 * pad
) * align
/ 2 + pad
;
576 dest
= gdk_pixbuf_get_pixels( pixbuf
) + 4 * x
+ pad
* stride
;
577 for ( j
= 0; j
< h
; j
++ )
580 for ( i
= 0; i
< w
; i
++ )
582 float a
= ( float ) bitmap
.buffer
[ j
* bitmap
.pitch
+ i
] / 255.0;
583 *d
++ = ( int ) ( a
* fg
.r
+ ( 1 - a
) * bg
.r
);
584 *d
++ = ( int ) ( a
* fg
.g
+ ( 1 - a
) * bg
.g
);
585 *d
++ = ( int ) ( a
* fg
.b
+ ( 1 - a
) * bg
.b
);
586 *d
++ = ( int ) ( a
* fg
.a
+ ( 1 - a
) * bg
.a
);
590 mlt_pool_release( bitmap
.buffer
);
591 g_object_unref( layout
);
592 g_object_unref( context
);
593 g_object_unref( fontmap
);