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pango colour handling
[melted] / src / modules / gtk2 / producer_pango.c
1 /*
2 * producer_pango.c -- a pango-based titler
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
5 *
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.
10 *
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.
15 *
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.
19 */
20
21 #include "producer_pango.h"
22 #include <framework/mlt_frame.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <gdk-pixbuf/gdk-pixbuf.h>
26 #include <pango/pangoft2.h>
27 #include <freetype/freetype.h>
28
29 struct producer_pango_s
30 {
31 struct mlt_producer_s parent;
32 int width;
33 int height;
34 uint8_t *image;
35 uint8_t *alpha;
36 char *fgcolor;
37 char *bgcolor;
38 int align;
39 int pad;
40 char *markup;
41 char *text;
42 char *font;
43 };
44
45 // special color type used by internal pango routines
46 typedef struct
47 {
48 uint8_t r, g, b, a;
49 } rgba_color;
50
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 );
57
58 mlt_producer producer_pango_init( const char *filename )
59 {
60 producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
61 if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
62 {
63 mlt_producer producer = &this->parent;
64
65 producer->get_frame = producer_get_frame;
66 producer->close = producer_close;
67
68 // This is required to initialise gdk-pixbuf
69 g_type_init();
70
71 // Get the properties interface
72 mlt_properties properties = mlt_producer_properties( &this->parent );
73
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" );
82
83 if ( filename == NULL )
84 {
85 mlt_properties_set( properties, "resource", "pango" );
86 mlt_properties_set( properties, "markup", "" );
87 }
88 else if ( filename[ 0 ] == '+' )
89 {
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 );
96 free( markup );
97 }
98 else
99 {
100 FILE *f = fopen( filename, "r" );
101 if ( f != NULL )
102 {
103 char line[81];
104 char *markup = NULL;
105 size_t size = 0;
106 line[80] = '\0';
107
108 while ( fgets( line, 80, f ) )
109 {
110 size += strlen( line ) + 1;
111 if ( markup )
112 {
113 markup = realloc( markup, size );
114 strcat( markup, line );
115 }
116 else
117 {
118 markup = strdup( line );
119 }
120 }
121 fclose( f );
122
123 if ( markup[ strlen( markup ) - 1 ] == '\n' )
124 markup[ strlen( markup ) - 1 ] = '\0';
125
126 mlt_properties_set( properties, "resource", ( char * ) filename );
127 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
128 free( markup );
129 }
130 else
131 {
132 mlt_properties_set( properties, "resource", "pango" );
133 mlt_properties_set( properties, "markup", "" );
134 }
135 }
136
137 return producer;
138 }
139 free( this );
140 return NULL;
141 }
142
143 static void set_string( char **string, char *value, char *fallback )
144 {
145 if ( value != NULL )
146 {
147 free( *string );
148 *string = strdup( value );
149 }
150 else if ( *string == NULL && fallback != NULL )
151 {
152 *string = strdup( fallback );
153 }
154 else if ( *string != NULL && fallback == NULL )
155 {
156 free( *string );
157 *string = NULL;
158 }
159 }
160
161 rgba_color parse_color( char *color )
162 {
163 rgba_color result = { 0xff, 0xff, 0xff, 0xff };
164
165 if ( !strncmp( color, "0x", 2 ) )
166 {
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;
173 }
174 else if ( !strcmp( color, "red" ) )
175 {
176 result.r = 0xff;
177 result.g = 0x00;
178 result.b = 0x00;
179 }
180 else if ( !strcmp( color, "green" ) )
181 {
182 result.r = 0x00;
183 result.g = 0xff;
184 result.b = 0x00;
185 }
186 else if ( !strcmp( color, "blue" ) )
187 {
188 result.r = 0x00;
189 result.g = 0x00;
190 result.b = 0xff;
191 }
192 else
193 {
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;
200 }
201
202 return result;
203 }
204
205 static void refresh_image( mlt_frame frame, int width, int height )
206 {
207 // Pixbuf
208 GdkPixbuf *pixbuf = NULL;
209
210 // Obtain properties of frame
211 mlt_properties properties = mlt_frame_properties( frame );
212
213 // Obtain the producer pango for this frame
214 producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
215
216 // Obtain the producer
217 mlt_producer producer = &this->parent;
218
219 // Obtain the producer properties
220 mlt_properties producer_props = mlt_producer_properties( producer );
221
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" );
230
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 ) );
239
240 // Save the properties for next comparison
241 this->align = align;
242 this->pad = pad;
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" );
248
249 if ( property_changed )
250 {
251 rgba_color fgcolor = parse_color( this->fgcolor );
252 rgba_color bgcolor = parse_color( this->bgcolor );
253
254 // Render the title
255 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
256
257 if ( pixbuf != NULL )
258 {
259 // Register this pixbuf for destruction and reuse
260 mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
261
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 ) );
264
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 );
268 }
269 }
270 else if ( this->image == NULL || width != this->width || height != this->height )
271 {
272 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
273 }
274
275 // If we have a pixbuf and a valid width
276 if ( pixbuf && width > 0 )
277 {
278 // Note - the original pixbuf is already safe and ready for destruction
279 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, GDK_INTERP_HYPER );
280
281 // Store width and height
282 this->width = gdk_pixbuf_get_width( pixbuf );
283 this->height = gdk_pixbuf_get_height( pixbuf );
284
285 // Allocate/define image and alpha
286 uint8_t *image = malloc( this->width * this->height * 2 );
287 uint8_t *alpha = NULL;
288
289 // Extract YUV422 and alpha
290 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
291 {
292 // Allocate the alpha mask
293 alpha = malloc( this->width * this->height );
294
295 // Convert the image
296 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
297 this->width, this->height,
298 gdk_pixbuf_get_rowstride( pixbuf ),
299 image, alpha );
300 }
301 else
302 {
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 ),
307 image );
308 }
309
310 // Finished with pixbuf now
311 g_object_unref( pixbuf );
312
313 // if single picture, reference the image and alpha in the producer
314 free( this->image );
315 this->image = image;
316 free( this->alpha );
317 this->alpha = alpha;
318 }
319
320 // Set width/height
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" ) );
325
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 );
329 }
330
331 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
332 {
333 // Obtain properties of frame
334 mlt_properties properties = mlt_frame_properties( frame );
335
336 // Refresh the image
337 refresh_image( frame, *width, *height );
338
339 // May need to know the size of the image to clone it
340 int size = 0;
341
342 // Get the image
343 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
344
345 // Get width and height
346 *width = mlt_properties_get_int( properties, "width" );
347 *height = mlt_properties_get_int( properties, "height" );
348
349 // Clone if necessary
350 if ( writable )
351 {
352 // Clone our image
353 uint8_t *copy = malloc( size );
354 memcpy( copy, image, size );
355
356 // We're going to pass the copy on
357 image = copy;
358
359 // Now update properties so we free the copy after
360 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
361 }
362
363 // Pass on the image
364 *buffer = image;
365
366 return 0;
367 }
368
369 static uint8_t *producer_get_alpha_mask( mlt_frame this )
370 {
371 // Obtain properties of frame
372 mlt_properties properties = mlt_frame_properties( this );
373
374 // Return the alpha mask
375 return mlt_properties_get_data( properties, "alpha", NULL );
376 }
377
378 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
379 {
380 producer_pango this = producer->child;
381
382 // Generate a frame
383 *frame = mlt_frame_init( );
384
385 // Obtain properties of frame and producer
386 mlt_properties properties = mlt_frame_properties( *frame );
387
388 // Set the producer on the frame properties
389 mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
390
391 // Refresh the pango image
392 refresh_image( *frame, 0, 0 );
393
394 // Set alpha mask call back
395 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
396
397 // Stack the get image callback
398 mlt_frame_push_get_image( *frame, producer_get_image );
399
400 // Update timecode on the frame we're creating
401 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
402
403 // Calculate the next timecode
404 mlt_producer_prepare_next( producer );
405
406 return 0;
407 }
408
409 static void producer_close( mlt_producer parent )
410 {
411 producer_pango this = parent->child;
412 free( this->image );
413 free( this->alpha );
414 free( this->fgcolor );
415 free( this->bgcolor );
416 free( this->markup );
417 free( this->text );
418 free( this->font );
419 parent->close = NULL;
420 mlt_producer_close( parent );
421 free( this );
422 }
423
424 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
425 {
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 );
429 int i, j;
430
431 for ( j = 0; j < hh; j++ )
432 {
433 for ( i = 0; i < ww; i++ )
434 {
435 *p++ = bg.r;
436 *p++ = bg.g;
437 *p++ = bg.b;
438 *p++ = bg.a;
439 }
440 }
441 }
442
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 )
444 {
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 );
448 int w, h, x;
449 int i, j;
450 GdkPixbuf *pixbuf = NULL;
451 FT_Bitmap bitmap;
452 uint8_t *src = NULL;
453 uint8_t* dest = NULL;
454 int stride;
455
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 ) );
465 else
466 return NULL;
467 pango_layout_get_pixel_size( layout, &w, &h );
468
469 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
470 pango_draw_background( pixbuf, bg );
471
472 stride = gdk_pixbuf_get_rowstride( pixbuf );
473
474 bitmap.width = w;
475 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
476 bitmap.rows = h;
477 bitmap.buffer = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
478 bitmap.num_grays = 256;
479 bitmap.pixel_mode = ft_pixel_mode_grays;
480
481 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
482
483 src = bitmap.buffer;
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++ )
487 {
488 uint8_t *d = dest;
489 for ( i = 0; i < w; i++ )
490 {
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 );
496 }
497 dest += stride;
498 }
499 free( bitmap.buffer );
500
501 g_object_unref( layout );
502 g_object_unref( context );
503 g_object_unref( fontmap );
504
505 return pixbuf;
506 }
507
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