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_int( properties
, "fgcolor", 0xffffffff );
77 mlt_properties_set_int( properties
, "bgcolor", 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" );
82 mlt_properties_set_int( properties
, "x", 0 );
83 mlt_properties_set_int( properties
, "y", 0 );
84 mlt_properties_set_double( properties
, "mix", 1.0 );
86 if ( filename
== NULL
)
88 mlt_properties_set( properties
, "resource", "pango" );
89 mlt_properties_set( properties
, "markup", "" );
93 FILE *f
= fopen( filename
, "r" );
101 while ( fgets( line
, 80, f
) )
103 size
+= strlen( line
) + 1;
106 markup
= realloc( markup
, size
);
107 strcat( markup
, line
);
111 markup
= strdup( line
);
115 mlt_properties_set( properties
, "resource", ( char * ) filename
);
116 mlt_properties_set( properties
, "markup", ( char * ) ( markup
== NULL ?
"" : markup
) );
122 mlt_properties_set( properties
, "resource", "pango" );
123 mlt_properties_set( properties
, "markup", "" );
133 static void refresh_image( mlt_frame frame
, int width
, int height
)
136 GdkPixbuf
*pixbuf
= NULL
;
138 // Obtain properties of frame
139 mlt_properties properties
= mlt_frame_properties( frame
);
141 // Obtain the producer pango for this frame
142 producer_pango
this = mlt_properties_get_data( properties
, "producer_pango", NULL
);
144 // Obtain the producer
145 mlt_producer producer
= &this->parent
;
147 // Obtain the producer properties
148 mlt_properties producer_props
= mlt_producer_properties( producer
);
150 // Get producer properties
151 int fg
= mlt_properties_get_int( producer_props
, "fgcolor" );
152 int bg
= mlt_properties_get_int( producer_props
, "bgcolor" );
153 int align
= mlt_properties_get_int( producer_props
, "align" );
154 int pad
= mlt_properties_get_int( producer_props
, "pad" );
155 char *markup
= mlt_properties_get( producer_props
, "markup" );
156 char *text
= mlt_properties_get( producer_props
, "text" );
157 char *font
= mlt_properties_get( producer_props
, "font" );
159 // See if any properties changed
160 int property_changed
= ( fg
!= this->fgcolor
);
161 property_changed
= property_changed
|| ( bg
!= this->bgcolor
);
162 property_changed
= property_changed
|| ( align
!= this->align
);
163 property_changed
= property_changed
|| ( pad
!= this->pad
);
164 property_changed
= property_changed
|| ( markup
&& this->markup
&& strcmp( markup
, this->markup
) );
165 property_changed
= property_changed
|| ( text
&& this->text
&& strcmp( text
, this->text
) );
166 property_changed
= property_changed
|| ( font
&& this->font
&& strcmp( font
, this->font
) );
168 // Save the properties for next comparison
173 if ( markup
!= NULL
)
175 free( this->markup
);
176 this->markup
= strdup( markup
);
181 this->text
= strdup( text
);
186 this->font
= strdup( font
);
189 if ( property_changed
)
193 ( fg
& 0xff000000 ) >> 24,
194 ( fg
& 0x00ff0000 ) >> 16,
195 ( fg
& 0x0000ff00 ) >> 8,
200 ( bg
& 0xff000000 ) >> 24,
201 ( bg
& 0x00ff0000 ) >> 16,
202 ( bg
& 0x0000ff00 ) >> 8,
207 pixbuf
= pango_get_pixbuf( markup
, text
, font
, fgcolor
, bgcolor
, pad
, align
);
209 if ( pixbuf
!= NULL
)
211 // Register this pixbuf for destruction and reuse
212 mlt_properties_set_data( producer_props
, "pixbuf", pixbuf
, 0, ( mlt_destructor
)g_object_unref
, NULL
);
214 // Store the width/height of the pixbuf temporarily
215 this->width
= gdk_pixbuf_get_width( pixbuf
);
216 this->height
= gdk_pixbuf_get_height( pixbuf
);
219 else if ( width
!= this->width
|| height
!= this->height
)
221 pixbuf
= mlt_properties_get_data( producer_props
, "pixbuf", NULL
);
224 // If we have a pixbuf and a valid width
225 if ( pixbuf
&& width
> 0 )
229 // Scale to width/height requested
230 if ( width
!= this->width
&& height
!= this->height
)
232 // Note - the original pixbuf is already safe and ready for destruction
233 pixbuf
= gdk_pixbuf_scale_simple( pixbuf
, width
, height
, GDK_INTERP_HYPER
);
237 // Store width and height
238 this->width
= gdk_pixbuf_get_width( pixbuf
);
239 this->height
= gdk_pixbuf_get_height( pixbuf
);
241 // Allocate/define image and alpha
242 uint8_t *image
= malloc( this->width
* this->height
* 2 );
243 uint8_t *alpha
= NULL
;
245 // Extract YUV422 and alpha
246 if ( gdk_pixbuf_get_has_alpha( pixbuf
) )
248 // Allocate the alpha mask
249 alpha
= malloc( this->width
* this->height
);
252 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
253 this->width
, this->height
,
254 gdk_pixbuf_get_rowstride( pixbuf
),
259 // No alpha to extract
260 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
261 this->width
, this->height
,
262 gdk_pixbuf_get_rowstride( pixbuf
),
266 // Finished with pixbuf now
268 g_object_unref( pixbuf
);
270 // if single picture, reference the image and alpha in the producer
278 mlt_properties_set_int( properties
, "width", this->width
);
279 mlt_properties_set_int( properties
, "height", this->height
);
281 // pass the image and alpha data without destructor
282 mlt_properties_set_data( properties
, "image", this->image
, this->width
* this->height
* 2, NULL
, NULL
);
283 mlt_properties_set_data( properties
, "alpha", this->alpha
, this->width
* this->height
, NULL
, NULL
);
286 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
288 // Obtain properties of frame
289 mlt_properties properties
= mlt_frame_properties( frame
);
292 refresh_image( frame
, *width
, *height
);
294 // May need to know the size of the image to clone it
298 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
300 // Get width and height
301 *width
= mlt_properties_get_int( properties
, "width" );
302 *height
= mlt_properties_get_int( properties
, "height" );
304 // Clone if necessary
308 uint8_t *copy
= malloc( size
);
309 memcpy( copy
, image
, size
);
311 // We're going to pass the copy on
314 // Now update properties so we free the copy after
315 mlt_properties_set_data( properties
, "image", copy
, size
, free
, NULL
);
324 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
326 // Obtain properties of frame
327 mlt_properties properties
= mlt_frame_properties( this );
329 // Return the alpha mask
330 return mlt_properties_get_data( properties
, "alpha", NULL
);
333 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
335 producer_pango
this = producer
->child
;
338 *frame
= mlt_frame_init( );
340 // Obtain properties of frame and producer
341 mlt_properties properties
= mlt_frame_properties( *frame
);
343 // Set the producer on the frame properties
344 mlt_properties_set_data( properties
, "producer_pango", this, 0, NULL
, NULL
);
346 // Refresh the pango image
347 refresh_image( *frame
, 0, 0 );
349 // Set alpha mask call back
350 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
352 // Stack the get image callback
353 mlt_frame_push_get_image( *frame
, producer_get_image
);
355 // Update timecode on the frame we're creating
356 mlt_frame_set_position( *frame
, mlt_producer_position( producer
) );
358 // Calculate the next timecode
359 mlt_producer_prepare_next( producer
);
364 static void producer_close( mlt_producer parent
)
366 producer_pango
this = parent
->child
;
369 free( this->markup
);
372 parent
->close
= NULL
;
373 mlt_producer_close( parent
);
377 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
)
379 int ww
= gdk_pixbuf_get_width( pixbuf
);
380 int hh
= gdk_pixbuf_get_height( pixbuf
);
381 uint8_t *p
= gdk_pixbuf_get_pixels( pixbuf
);
384 for ( j
= 0; j
< hh
; j
++ )
386 for ( i
= 0; i
< ww
; i
++ )
396 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, const char *text
, const char *font
, rgba_color fg
, rgba_color bg
, int pad
, int align
)
398 PangoFT2FontMap
*fontmap
= (PangoFT2FontMap
*) pango_ft2_font_map_new();
399 PangoContext
*context
= pango_ft2_font_map_create_context( fontmap
);
400 PangoLayout
*layout
= pango_layout_new( context
);
403 GdkPixbuf
*pixbuf
= NULL
;
406 uint8_t* dest
= NULL
;
409 pango_ft2_font_map_set_resolution( fontmap
, 72, 72 );
410 pango_layout_set_width( layout
, -1 ); // set wrapping constraints
411 pango_layout_set_font_description( layout
, pango_font_description_from_string( font
) );
412 // pango_layout_set_spacing( layout, space );
413 pango_layout_set_alignment( layout
, ( PangoAlignment
) align
);
414 if ( markup
!= NULL
&& strcmp( markup
, "" ) != 0 )
415 pango_layout_set_markup( layout
, markup
, strlen( markup
) );
416 else if ( text
!= NULL
&& strcmp( text
, "" ) != 0 )
417 pango_layout_set_text( layout
, text
, strlen( text
) );
420 pango_layout_get_pixel_size( layout
, &w
, &h
);
422 pixbuf
= gdk_pixbuf_new( GDK_COLORSPACE_RGB
, TRUE
/* has alpha */, 8, w
+ 2 * pad
, h
+ 2 * pad
);
423 pango_draw_background( pixbuf
, bg
);
425 stride
= gdk_pixbuf_get_rowstride( pixbuf
);
428 bitmap
.pitch
= 32 * ( ( w
+ 31 ) / 31 );
430 bitmap
.buffer
= ( unsigned char * ) calloc( 1, h
* bitmap
.pitch
);
431 bitmap
.num_grays
= 256;
432 bitmap
.pixel_mode
= ft_pixel_mode_grays
;
434 pango_ft2_render_layout( &bitmap
, layout
, 0, 0 );
437 x
= ( gdk_pixbuf_get_width( pixbuf
) - w
- 2 * pad
) * align
/ 2 + pad
;
438 dest
= gdk_pixbuf_get_pixels( pixbuf
) + 4 * x
+ pad
* stride
;
439 for ( j
= 0; j
< h
; j
++ )
442 for ( i
= 0; i
< w
; i
++ )
444 float a
= ( float ) bitmap
.buffer
[ j
* bitmap
.pitch
+ i
] / 255.0;
445 *d
++ = ( int ) ( a
* fg
.r
+ ( 1 - a
) * bg
.r
);
446 *d
++ = ( int ) ( a
* fg
.g
+ ( 1 - a
) * bg
.g
);
447 *d
++ = ( int ) ( a
* fg
.b
+ ( 1 - a
) * bg
.b
);
448 *d
++ = ( int ) ( a
* fg
.a
+ ( 1 - a
) * bg
.a
);
452 free( bitmap
.buffer
);
454 g_object_unref( layout
);
455 g_object_unref( context
);
456 g_object_unref( fontmap
);