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 mlt_producer
producer_pango_init( const char *filename
)
60 producer_pango
this = calloc( sizeof( struct producer_pango_s
), 1 );
61 if ( this != NULL
&& mlt_producer_init( &this->parent
, this ) == 0 )
63 mlt_producer producer
= &this->parent
;
65 producer
->get_frame
= producer_get_frame
;
66 producer
->close
= producer_close
;
68 // This is required to initialise gdk-pixbuf
71 // Get the properties interface
72 mlt_properties properties
= mlt_producer_properties( &this->parent
);
74 // Set the default properties
75 mlt_properties_set_int( properties
, "video_standard", mlt_video_standard_pal
);
76 mlt_properties_set( properties
, "fgcolour", "0xffffffff" );
77 mlt_properties_set( properties
, "bgcolour", "0x00000000" );
78 mlt_properties_set_int( properties
, "align", pango_align_left
);
79 mlt_properties_set_int( properties
, "pad", 0 );
80 mlt_properties_set( properties
, "text", "" );
81 mlt_properties_set( properties
, "font", "Sans 48" );
83 if ( filename
== NULL
)
85 mlt_properties_set( properties
, "resource", "pango" );
86 mlt_properties_set( properties
, "markup", "" );
88 else if ( filename
[ 0 ] == '+' )
90 char *markup
= strdup( filename
+ 1 );
91 ( *strrchr( markup
, '.' ) ) = '\0';
92 while ( strchr( markup
, '~' ) )
93 ( *strchr( markup
, '~' ) ) = '\n';
94 mlt_properties_set( properties
, "resource", ( char * )filename
);
95 mlt_properties_set( properties
, "markup", markup
);
100 FILE *f
= fopen( filename
, "r" );
108 while ( fgets( line
, 80, f
) )
110 size
+= strlen( line
) + 1;
113 markup
= realloc( markup
, size
);
114 strcat( markup
, line
);
118 markup
= strdup( line
);
123 if ( markup
[ strlen( markup
) - 1 ] == '\n' )
124 markup
[ strlen( markup
) - 1 ] = '\0';
126 mlt_properties_set( properties
, "resource", ( char * ) filename
);
127 mlt_properties_set( properties
, "markup", ( char * ) ( markup
== NULL ?
"" : markup
) );
132 mlt_properties_set( properties
, "resource", "pango" );
133 mlt_properties_set( properties
, "markup", "" );
143 static void set_string( char **string
, char *value
, char *fallback
)
148 *string
= strdup( value
);
150 else if ( *string
== NULL
&& fallback
!= NULL
)
152 *string
= strdup( fallback
);
154 else if ( *string
!= NULL
&& fallback
== NULL
)
161 rgba_color
parse_color( char *color
)
163 rgba_color result
= { 0xff, 0xff, 0xff, 0xff };
165 if ( !strncmp( color
, "0x", 2 ) )
167 unsigned int temp
= 0;
168 sscanf( color
+ 2, "%x", &temp
);
169 result
.r
= ( temp
>> 24 ) & 0xff;
170 result
.g
= ( temp
>> 16 ) & 0xff;
171 result
.b
= ( temp
>> 8 ) & 0xff;
172 result
.a
= ( temp
) & 0xff;
174 else if ( !strcmp( color
, "red" ) )
180 else if ( !strcmp( color
, "green" ) )
186 else if ( !strcmp( color
, "blue" ) )
194 unsigned int temp
= 0;
195 sscanf( color
, "%d", &temp
);
196 result
.r
= ( temp
>> 24 ) & 0xff;
197 result
.g
= ( temp
>> 16 ) & 0xff;
198 result
.b
= ( temp
>> 8 ) & 0xff;
199 result
.a
= ( temp
) & 0xff;
205 static void refresh_image( mlt_frame frame
, int width
, int height
)
208 GdkPixbuf
*pixbuf
= NULL
;
210 // Obtain properties of frame
211 mlt_properties properties
= mlt_frame_properties( frame
);
213 // Obtain the producer pango for this frame
214 producer_pango
this = mlt_properties_get_data( properties
, "producer_pango", NULL
);
216 // Obtain the producer
217 mlt_producer producer
= &this->parent
;
219 // Obtain the producer properties
220 mlt_properties producer_props
= mlt_producer_properties( producer
);
222 // Get producer properties
223 char *fg
= mlt_properties_get( producer_props
, "fgcolour" );
224 char *bg
= mlt_properties_get( producer_props
, "bgcolour" );
225 int align
= mlt_properties_get_int( producer_props
, "align" );
226 int pad
= mlt_properties_get_int( producer_props
, "pad" );
227 char *markup
= mlt_properties_get( producer_props
, "markup" );
228 char *text
= mlt_properties_get( producer_props
, "text" );
229 char *font
= mlt_properties_get( producer_props
, "font" );
231 // See if any properties changed
232 int property_changed
= ( this->fgcolor
== NULL
|| strcmp( fg
, this->fgcolor
) );
233 property_changed
= property_changed
|| ( this->bgcolor
== NULL
|| strcmp( bg
, this->bgcolor
) );
234 property_changed
= property_changed
|| ( align
!= this->align
);
235 property_changed
= property_changed
|| ( pad
!= this->pad
);
236 property_changed
= property_changed
|| ( markup
&& this->markup
&& strcmp( markup
, this->markup
) );
237 property_changed
= property_changed
|| ( text
&& this->text
&& strcmp( text
, this->text
) );
238 property_changed
= property_changed
|| ( font
&& this->font
&& strcmp( font
, this->font
) );
240 // Save the properties for next comparison
243 set_string( &this->fgcolor
, fg
, "0xffffffff" );
244 set_string( &this->bgcolor
, bg
, "0x00000000" );
245 set_string( &this->markup
, markup
, NULL
);
246 set_string( &this->text
, text
, NULL
);
247 set_string( &this->font
, font
, "Sans 48" );
249 if ( property_changed
)
251 rgba_color fgcolor
= parse_color( this->fgcolor
);
252 rgba_color bgcolor
= parse_color( this->bgcolor
);
255 pixbuf
= pango_get_pixbuf( markup
, text
, font
, fgcolor
, bgcolor
, pad
, align
);
257 if ( pixbuf
!= NULL
)
259 // Register this pixbuf for destruction and reuse
260 mlt_properties_set_data( producer_props
, "pixbuf", pixbuf
, 0, ( mlt_destructor
)g_object_unref
, NULL
);
262 mlt_properties_set_int( producer_props
, "real_width", gdk_pixbuf_get_width( pixbuf
) );
263 mlt_properties_set_int( producer_props
, "real_height", gdk_pixbuf_get_height( pixbuf
) );
265 // Store the width/height of the pixbuf temporarily
266 this->width
= gdk_pixbuf_get_width( pixbuf
);
267 this->height
= gdk_pixbuf_get_height( pixbuf
);
270 else if ( this->image
== NULL
|| width
!= this->width
|| height
!= this->height
)
272 pixbuf
= mlt_properties_get_data( producer_props
, "pixbuf", NULL
);
275 // If we have a pixbuf and a valid width
276 if ( pixbuf
&& width
> 0 )
278 // Note - the original pixbuf is already safe and ready for destruction
279 pixbuf
= gdk_pixbuf_scale_simple( pixbuf
, width
, height
, GDK_INTERP_HYPER
);
281 // Store width and height
282 this->width
= gdk_pixbuf_get_width( pixbuf
);
283 this->height
= gdk_pixbuf_get_height( pixbuf
);
285 // Allocate/define image and alpha
286 uint8_t *image
= malloc( this->width
* this->height
* 2 );
287 uint8_t *alpha
= NULL
;
289 // Extract YUV422 and alpha
290 if ( gdk_pixbuf_get_has_alpha( pixbuf
) )
292 // Allocate the alpha mask
293 alpha
= malloc( this->width
* this->height
);
296 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
297 this->width
, this->height
,
298 gdk_pixbuf_get_rowstride( pixbuf
),
303 // No alpha to extract
304 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
305 this->width
, this->height
,
306 gdk_pixbuf_get_rowstride( pixbuf
),
310 // Finished with pixbuf now
311 g_object_unref( pixbuf
);
313 // if single picture, reference the image and alpha in the producer
321 mlt_properties_set_int( properties
, "width", this->width
);
322 mlt_properties_set_int( properties
, "height", this->height
);
323 mlt_properties_set_int( properties
, "real_width", mlt_properties_get_int( producer_props
, "real_width" ) );
324 mlt_properties_set_int( properties
, "real_height", mlt_properties_get_int( producer_props
, "real_height" ) );
326 // pass the image and alpha data without destructor
327 mlt_properties_set_data( properties
, "image", this->image
, this->width
* this->height
* 2, NULL
, NULL
);
328 mlt_properties_set_data( properties
, "alpha", this->alpha
, this->width
* this->height
, NULL
, NULL
);
331 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
333 // Obtain properties of frame
334 mlt_properties properties
= mlt_frame_properties( frame
);
337 refresh_image( frame
, *width
, *height
);
339 // May need to know the size of the image to clone it
343 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
345 // Get width and height
346 *width
= mlt_properties_get_int( properties
, "width" );
347 *height
= mlt_properties_get_int( properties
, "height" );
349 // Clone if necessary
353 uint8_t *copy
= malloc( size
);
354 memcpy( copy
, image
, size
);
356 // We're going to pass the copy on
359 // Now update properties so we free the copy after
360 mlt_properties_set_data( properties
, "image", copy
, size
, free
, NULL
);
369 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
371 // Obtain properties of frame
372 mlt_properties properties
= mlt_frame_properties( this );
374 // Return the alpha mask
375 return mlt_properties_get_data( properties
, "alpha", NULL
);
378 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
380 producer_pango
this = producer
->child
;
383 *frame
= mlt_frame_init( );
385 // Obtain properties of frame and producer
386 mlt_properties properties
= mlt_frame_properties( *frame
);
388 // Set the producer on the frame properties
389 mlt_properties_set_data( properties
, "producer_pango", this, 0, NULL
, NULL
);
391 // Refresh the pango image
392 refresh_image( *frame
, 0, 0 );
394 // Set alpha mask call back
395 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
397 // Stack the get image callback
398 mlt_frame_push_get_image( *frame
, producer_get_image
);
400 // Update timecode on the frame we're creating
401 mlt_frame_set_position( *frame
, mlt_producer_position( producer
) );
403 // Calculate the next timecode
404 mlt_producer_prepare_next( producer
);
409 static void producer_close( mlt_producer parent
)
411 producer_pango
this = parent
->child
;
414 free( this->fgcolor
);
415 free( this->bgcolor
);
416 free( this->markup
);
419 parent
->close
= NULL
;
420 mlt_producer_close( parent
);
424 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
)
426 int ww
= gdk_pixbuf_get_width( pixbuf
);
427 int hh
= gdk_pixbuf_get_height( pixbuf
);
428 uint8_t *p
= gdk_pixbuf_get_pixels( pixbuf
);
431 for ( j
= 0; j
< hh
; j
++ )
433 for ( i
= 0; i
< ww
; i
++ )
443 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
, rgba_color fg
, rgba_color bg
, int pad
, int align
)
445 PangoFT2FontMap
*fontmap
= (PangoFT2FontMap
*) pango_ft2_font_map_new();
446 PangoContext
*context
= pango_ft2_font_map_create_context( fontmap
);
447 PangoLayout
*layout
= pango_layout_new( context
);
450 GdkPixbuf
*pixbuf
= NULL
;
453 uint8_t* dest
= NULL
;
456 pango_ft2_font_map_set_resolution( fontmap
, 72, 72 );
457 pango_layout_set_width( layout
, -1 ); // set wrapping constraints
458 pango_layout_set_font_description( layout
, pango_font_description_from_string( font
) );
459 // pango_layout_set_spacing( layout, space );
460 pango_layout_set_alignment( layout
, ( PangoAlignment
) align
);
461 if ( markup
!= NULL
&& strcmp( markup
, "" ) != 0 )
462 pango_layout_set_markup( layout
, markup
, strlen( markup
) );
463 else if ( text
!= NULL
&& strcmp( text
, "" ) != 0 )
464 pango_layout_set_text( layout
, text
, strlen( text
) );
467 pango_layout_get_pixel_size( layout
, &w
, &h
);
469 pixbuf
= gdk_pixbuf_new( GDK_COLORSPACE_RGB
, TRUE
/* has alpha */, 8, w
+ 2 * pad
, h
+ 2 * pad
);
470 pango_draw_background( pixbuf
, bg
);
472 stride
= gdk_pixbuf_get_rowstride( pixbuf
);
475 bitmap
.pitch
= 32 * ( ( w
+ 31 ) / 31 );
477 bitmap
.buffer
= ( unsigned char * ) calloc( 1, h
* bitmap
.pitch
);
478 bitmap
.num_grays
= 256;
479 bitmap
.pixel_mode
= ft_pixel_mode_grays
;
481 pango_ft2_render_layout( &bitmap
, layout
, 0, 0 );
484 x
= ( gdk_pixbuf_get_width( pixbuf
) - w
- 2 * pad
) * align
/ 2 + pad
;
485 dest
= gdk_pixbuf_get_pixels( pixbuf
) + 4 * x
+ pad
* stride
;
486 for ( j
= 0; j
< h
; j
++ )
489 for ( i
= 0; i
< w
; i
++ )
491 float a
= ( float ) bitmap
.buffer
[ j
* bitmap
.pitch
+ i
] / 255.0;
492 *d
++ = ( int ) ( a
* fg
.r
+ ( 1 - a
) * bg
.r
);
493 *d
++ = ( int ) ( a
* fg
.g
+ ( 1 - a
) * bg
.g
);
494 *d
++ = ( int ) ( a
* fg
.b
+ ( 1 - a
) * bg
.b
);
495 *d
++ = ( int ) ( a
* fg
.a
+ ( 1 - a
) * bg
.a
);
499 free( bitmap
.buffer
);
501 g_object_unref( layout
);
502 g_object_unref( context
);
503 g_object_unref( fontmap
);