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better propogating of producer and transition properties to the frame in pango and...
[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 int fgcolor;
37 int 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_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 );
85
86 if ( filename == NULL )
87 {
88 mlt_properties_set( properties, "resource", "pango" );
89 mlt_properties_set( properties, "markup", "" );
90 }
91 else
92 {
93 FILE *f = fopen( filename, "r" );
94 if ( f != NULL )
95 {
96 char line[81];
97 char *markup = NULL;
98 size_t size = 0;
99 line[80] = '\0';
100
101 while ( fgets( line, 80, f ) )
102 {
103 size += strlen( line ) + 1;
104 if ( markup )
105 {
106 realloc( markup, size );
107 strcat( markup, line );
108 }
109 else
110 {
111 markup = strdup( line );
112 }
113 }
114 fclose( f );
115 mlt_properties_set( properties, "resource", ( char * ) filename );
116 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
117 if ( markup )
118 free( markup );
119 }
120 else
121 {
122 mlt_properties_set( properties, "resource", "pango" );
123 mlt_properties_set( properties, "markup", "" );
124 }
125 }
126
127 return producer;
128 }
129 free( this );
130 return NULL;
131 }
132
133 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
134 {
135 // Obtain properties of frame
136 mlt_properties properties = mlt_frame_properties( this );
137
138 // May need to know the size of the image to clone it
139 int size = 0;
140
141 // Get the image
142 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
143
144 // Get width and height
145 *width = mlt_properties_get_int( properties, "width" );
146 *height = mlt_properties_get_int( properties, "height" );
147
148 // Clone if necessary
149 if ( writable )
150 {
151 // Clone our image
152 uint8_t *copy = malloc( size );
153 memcpy( copy, image, size );
154
155 // We're going to pass the copy on
156 image = copy;
157
158 // Now update properties so we free the copy after
159 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
160 }
161
162 // Pass on the image
163 *buffer = image;
164
165 return 0;
166 }
167
168 static uint8_t *producer_get_alpha_mask( mlt_frame this )
169 {
170 // Obtain properties of frame
171 mlt_properties properties = mlt_frame_properties( this );
172
173 // Return the alpha mask
174 return mlt_properties_get_data( properties, "alpha", NULL );
175 }
176
177 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
178 {
179 producer_pango this = producer->child;
180 GdkPixbuf *pixbuf = NULL;
181
182 // Generate a frame
183 *frame = mlt_frame_init( );
184
185 // Obtain properties of frame and producer
186 mlt_properties properties = mlt_frame_properties( *frame );
187 mlt_properties producer_props = mlt_producer_properties( producer );
188
189 // Get producer properties
190 int fg = mlt_properties_get_int( producer_props, "fgcolor" );
191 int bg = mlt_properties_get_int( producer_props, "bgcolor" );
192 int align = mlt_properties_get_int( producer_props, "align" );
193 int pad = mlt_properties_get_int( producer_props, "pad" );
194 char *markup = mlt_properties_get( producer_props, "markup" );
195 char *text = mlt_properties_get( producer_props, "text" );
196 char *font = mlt_properties_get( producer_props, "font" );
197
198 // See if any properties changed
199 int property_changed = ( fg != this->fgcolor );
200 property_changed = property_changed || ( bg != this->bgcolor );
201 property_changed = property_changed || ( align != this->align );
202 property_changed = property_changed || ( pad != this->pad );
203 property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
204 property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
205 property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
206
207 // Save the properties for next comparison
208 this->fgcolor = fg;
209 this->bgcolor = bg;
210 this->align = align;
211 this->pad = pad;
212 if ( markup != NULL )
213 {
214 if ( this->markup != NULL )
215 free( this->markup );
216 this->markup = strdup( markup );
217 }
218 if ( text != NULL )
219 {
220 if ( this->text != NULL )
221 free( this->text );
222 this->text = strdup( text );
223 }
224 if ( font != NULL )
225 {
226 if ( this->font != NULL )
227 free( this->font );
228 this->font = strdup( font );
229 }
230
231 if ( property_changed )
232 {
233 rgba_color fgcolor =
234 {
235 ( fg & 0xff000000 ) >> 24,
236 ( fg & 0x00ff0000 ) >> 16,
237 ( fg & 0x0000ff00 ) >> 8,
238 ( fg & 0x000000ff )
239 };
240 rgba_color bgcolor =
241 {
242 ( bg & 0xff000000 ) >> 24,
243 ( bg & 0x00ff0000 ) >> 16,
244 ( bg & 0x0000ff00 ) >> 8,
245 ( bg & 0x000000ff )
246 };
247
248 // Render the title
249 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
250 }
251
252 // If we have a pixbuf
253 if ( pixbuf )
254 {
255 // Scale to adjust for sample aspect ratio
256 if ( mlt_properties_get_int( properties, "video_standard" ) == mlt_video_standard_pal )
257 {
258 GdkPixbuf *temp = pixbuf;
259 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
260 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 54.0/59.0),
261 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
262 pixbuf = scaled;
263 g_object_unref( temp );
264 }
265 else
266 {
267 GdkPixbuf *temp = pixbuf;
268 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
269 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 11.0/10.0 ),
270 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
271 pixbuf = scaled;
272 g_object_unref( temp );
273 }
274
275 // Store width and height
276 this->width = gdk_pixbuf_get_width( pixbuf );
277 this->height = gdk_pixbuf_get_height( pixbuf );
278
279 // Allocate/define image and alpha
280 uint8_t *image = malloc( this->width * this->height * 2 );
281 uint8_t *alpha = NULL;
282
283 // Extract YUV422 and alpha
284 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
285 {
286 // Allocate the alpha mask
287 alpha = malloc( this->width * this->height );
288
289 // Convert the image
290 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
291 this->width, this->height,
292 gdk_pixbuf_get_rowstride( pixbuf ),
293 image, alpha );
294 }
295 else
296 {
297 // No alpha to extract
298 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
299 this->width, this->height,
300 gdk_pixbuf_get_rowstride( pixbuf ),
301 image );
302 }
303
304 // Finished with pixbuf now
305 g_object_unref( pixbuf );
306
307 // if single picture, reference the image and alpha in the producer
308 if ( this->image != NULL )
309 free( this->image );
310 this->image = image;
311 if ( this->alpha != NULL )
312 free( this->alpha );
313 this->alpha = alpha;
314
315 }
316
317 if ( this->image != NULL )
318 {
319 // Set width/height
320 mlt_properties_set_int( properties, "width", this->width );
321 mlt_properties_set_int( properties, "height", this->height );
322
323 // Set the compositing properties
324 if ( mlt_properties_get( producer_props, "x" ) != NULL )
325 mlt_properties_set_int( properties, "x", mlt_properties_get_int( producer_props, "x" ) );
326 if ( mlt_properties_get( producer_props, "y" ) != NULL )
327 mlt_properties_set_int( properties, "y", mlt_properties_get_int( producer_props, "y" ) );
328 if ( mlt_properties_get( producer_props, "mix" ) != NULL )
329 mlt_properties_set_double( properties, "mix", mlt_properties_get_double( producer_props, "mix" ) );
330
331 // if picture sequence pass the image and alpha data without destructor
332 mlt_properties_set_data( properties, "image", this->image, this->width * this->height * 2, NULL, NULL );
333 mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
334
335 // Set alpha mask call back
336 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
337
338 // Stack the get image callback
339 mlt_frame_push_get_image( *frame, producer_get_image );
340 }
341
342 // Update timecode on the frame we're creating
343 mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
344
345 // Calculate the next timecode
346 mlt_producer_prepare_next( producer );
347
348 return 0;
349 }
350
351 static void producer_close( mlt_producer parent )
352 {
353 producer_pango this = parent->child;
354 if ( this->image != NULL )
355 free( this->image );
356 if ( this->alpha != NULL )
357 free( this->alpha );
358 if ( this->markup != NULL )
359 free( this->markup );
360 if ( this->text != NULL )
361 free( this->text );
362 if ( this->font != NULL )
363 free( this->font );
364 parent->close = NULL;
365 mlt_producer_close( parent );
366 free( this );
367 }
368
369 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
370 {
371 int ww = gdk_pixbuf_get_width( pixbuf );
372 int hh = gdk_pixbuf_get_height( pixbuf );
373 uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
374 int i, j;
375
376 for ( j = 0; j < hh; j++ )
377 {
378 for ( i = 0; i < ww; i++ )
379 {
380 *p++ = bg.r;
381 *p++ = bg.g;
382 *p++ = bg.b;
383 *p++ = bg.a;
384 }
385 }
386 }
387
388 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align )
389 {
390 PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
391 PangoContext *context = pango_ft2_font_map_create_context( fontmap );
392 PangoLayout *layout = pango_layout_new( context );
393 int w, h, x;
394 int i, j;
395 GdkPixbuf *pixbuf = NULL;
396 FT_Bitmap bitmap;
397 uint8_t *src = NULL;
398 uint8_t* dest = NULL;
399 int stride;
400
401 pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
402 pango_layout_set_width( layout, -1 ); // set wrapping constraints
403 pango_layout_set_font_description( layout, pango_font_description_from_string( font ) );
404 // pango_layout_set_spacing( layout, space );
405 pango_layout_set_alignment( layout, ( PangoAlignment ) align );
406 if ( markup != NULL && strcmp( markup, "" ) != 0 )
407 pango_layout_set_markup( layout, markup, strlen( markup ) );
408 else if ( text != NULL && strcmp( text, "" ) != 0 )
409 pango_layout_set_text( layout, text, strlen( text ) );
410 else
411 return NULL;
412 pango_layout_get_pixel_size( layout, &w, &h );
413
414 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
415 pango_draw_background( pixbuf, bg );
416
417 stride = gdk_pixbuf_get_rowstride( pixbuf );
418
419 bitmap.width = w;
420 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
421 bitmap.rows = h;
422 bitmap.buffer = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
423 bitmap.num_grays = 256;
424 bitmap.pixel_mode = ft_pixel_mode_grays;
425
426 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
427
428 src = bitmap.buffer;
429 x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
430 dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
431 for ( j = 0; j < h; j++ )
432 {
433 uint8_t *d = dest;
434 for ( i = 0; i < w; i++ )
435 {
436 float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
437 *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
438 *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
439 *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
440 *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
441 }
442 dest += stride;
443 }
444 free( bitmap.buffer );
445
446 g_object_unref( layout );
447 g_object_unref( context );
448 g_object_unref( fontmap );
449
450 return pixbuf;
451 }
452
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