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pango producer rework
[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 markup = 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 void refresh_image( mlt_frame frame, int width, int height )
134 {
135 // Pixbuf
136 GdkPixbuf *pixbuf = NULL;
137
138 // Obtain properties of frame
139 mlt_properties properties = mlt_frame_properties( frame );
140
141 // Obtain the producer pango for this frame
142 producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
143
144 // Obtain the producer
145 mlt_producer producer = &this->parent;
146
147 // Obtain the producer properties
148 mlt_properties producer_props = mlt_producer_properties( producer );
149
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" );
158
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 ) );
167
168 // Save the properties for next comparison
169 this->fgcolor = fg;
170 this->bgcolor = bg;
171 this->align = align;
172 this->pad = pad;
173 if ( markup != NULL )
174 {
175 free( this->markup );
176 this->markup = strdup( markup );
177 }
178 if ( text != NULL )
179 {
180 free( this->text );
181 this->text = strdup( text );
182 }
183 if ( font != NULL )
184 {
185 free( this->font );
186 this->font = strdup( font );
187 }
188
189 if ( property_changed )
190 {
191 rgba_color fgcolor =
192 {
193 ( fg & 0xff000000 ) >> 24,
194 ( fg & 0x00ff0000 ) >> 16,
195 ( fg & 0x0000ff00 ) >> 8,
196 ( fg & 0x000000ff )
197 };
198 rgba_color bgcolor =
199 {
200 ( bg & 0xff000000 ) >> 24,
201 ( bg & 0x00ff0000 ) >> 16,
202 ( bg & 0x0000ff00 ) >> 8,
203 ( bg & 0x000000ff )
204 };
205
206 // Render the title
207 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
208
209 if ( pixbuf != NULL )
210 {
211 // Register this pixbuf for destruction and reuse
212 mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
213
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 );
217 }
218 }
219 else if ( width != this->width || height != this->height )
220 {
221 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
222 }
223
224 // If we have a pixbuf and a valid width
225 if ( pixbuf && width > 0 )
226 {
227 int delete = 0;
228
229 // Scale to width/height requested
230 if ( width != this->width && height != this->height )
231 {
232 // Note - the original pixbuf is already safe and ready for destruction
233 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, GDK_INTERP_HYPER );
234 delete = 1;
235 }
236
237 // Store width and height
238 this->width = gdk_pixbuf_get_width( pixbuf );
239 this->height = gdk_pixbuf_get_height( pixbuf );
240
241 // Allocate/define image and alpha
242 uint8_t *image = malloc( this->width * this->height * 2 );
243 uint8_t *alpha = NULL;
244
245 // Extract YUV422 and alpha
246 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
247 {
248 // Allocate the alpha mask
249 alpha = malloc( this->width * this->height );
250
251 // Convert the image
252 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
253 this->width, this->height,
254 gdk_pixbuf_get_rowstride( pixbuf ),
255 image, alpha );
256 }
257 else
258 {
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 ),
263 image );
264 }
265
266 // Finished with pixbuf now
267 if ( delete )
268 g_object_unref( pixbuf );
269
270 // if single picture, reference the image and alpha in the producer
271 free( this->image );
272 this->image = image;
273 free( this->alpha );
274 this->alpha = alpha;
275 }
276
277 // Set width/height
278 mlt_properties_set_int( properties, "width", this->width );
279 mlt_properties_set_int( properties, "height", this->height );
280
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 );
284 }
285
286 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
287 {
288 // Obtain properties of frame
289 mlt_properties properties = mlt_frame_properties( frame );
290
291 // Refresh the image
292 refresh_image( frame, *width, *height );
293
294 // May need to know the size of the image to clone it
295 int size = 0;
296
297 // Get the image
298 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
299
300 // Get width and height
301 *width = mlt_properties_get_int( properties, "width" );
302 *height = mlt_properties_get_int( properties, "height" );
303
304 // Clone if necessary
305 if ( writable )
306 {
307 // Clone our image
308 uint8_t *copy = malloc( size );
309 memcpy( copy, image, size );
310
311 // We're going to pass the copy on
312 image = copy;
313
314 // Now update properties so we free the copy after
315 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
316 }
317
318 // Pass on the image
319 *buffer = image;
320
321 return 0;
322 }
323
324 static uint8_t *producer_get_alpha_mask( mlt_frame this )
325 {
326 // Obtain properties of frame
327 mlt_properties properties = mlt_frame_properties( this );
328
329 // Return the alpha mask
330 return mlt_properties_get_data( properties, "alpha", NULL );
331 }
332
333 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
334 {
335 producer_pango this = producer->child;
336
337 // Generate a frame
338 *frame = mlt_frame_init( );
339
340 // Obtain properties of frame and producer
341 mlt_properties properties = mlt_frame_properties( *frame );
342
343 // Set the producer on the frame properties
344 mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
345
346 // Refresh the pango image
347 refresh_image( *frame, 0, 0 );
348
349 // Set alpha mask call back
350 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
351
352 // Stack the get image callback
353 mlt_frame_push_get_image( *frame, producer_get_image );
354
355 // Update timecode on the frame we're creating
356 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
357
358 // Calculate the next timecode
359 mlt_producer_prepare_next( producer );
360
361 return 0;
362 }
363
364 static void producer_close( mlt_producer parent )
365 {
366 producer_pango this = parent->child;
367 free( this->image );
368 free( this->alpha );
369 free( this->markup );
370 free( this->text );
371 free( this->font );
372 parent->close = NULL;
373 mlt_producer_close( parent );
374 free( this );
375 }
376
377 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
378 {
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 );
382 int i, j;
383
384 for ( j = 0; j < hh; j++ )
385 {
386 for ( i = 0; i < ww; i++ )
387 {
388 *p++ = bg.r;
389 *p++ = bg.g;
390 *p++ = bg.b;
391 *p++ = bg.a;
392 }
393 }
394 }
395
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 )
397 {
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 );
401 int w, h, x;
402 int i, j;
403 GdkPixbuf *pixbuf = NULL;
404 FT_Bitmap bitmap;
405 uint8_t *src = NULL;
406 uint8_t* dest = NULL;
407 int stride;
408
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 ) );
418 else
419 return NULL;
420 pango_layout_get_pixel_size( layout, &w, &h );
421
422 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
423 pango_draw_background( pixbuf, bg );
424
425 stride = gdk_pixbuf_get_rowstride( pixbuf );
426
427 bitmap.width = w;
428 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
429 bitmap.rows = h;
430 bitmap.buffer = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
431 bitmap.num_grays = 256;
432 bitmap.pixel_mode = ft_pixel_mode_grays;
433
434 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
435
436 src = bitmap.buffer;
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++ )
440 {
441 uint8_t *d = dest;
442 for ( i = 0; i < w; i++ )
443 {
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 );
449 }
450 dest += stride;
451 }
452 free( bitmap.buffer );
453
454 g_object_unref( layout );
455 g_object_unref( context );
456 g_object_unref( fontmap );
457
458 return pixbuf;
459 }
460
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