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", 1 );
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 );