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miracle part 1
[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 *markup )
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, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
81 mlt_properties_set( properties, "text", "" );
82 mlt_properties_set( properties, "font", "Sans 48" );
83 mlt_properties_set_int( properties, "x", 0 );
84 mlt_properties_set_int( properties, "y", 0 );
85 mlt_properties_set_double( properties, "mix", 1.0 );
86
87 mlt_properties_set( properties, "resource", "pango" );
88
89 return producer;
90 }
91 free( this );
92 return NULL;
93 }
94
95 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
96 {
97 // Obtain properties of frame
98 mlt_properties properties = mlt_frame_properties( this );
99
100 // May need to know the size of the image to clone it
101 int size = 0;
102
103 // Get the image
104 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
105
106 // Get width and height
107 *width = mlt_properties_get_int( properties, "width" );
108 *height = mlt_properties_get_int( properties, "height" );
109
110 // Clone if necessary
111 if ( writable )
112 {
113 // Clone our image
114 uint8_t *copy = malloc( size );
115 memcpy( copy, image, size );
116
117 // We're going to pass the copy on
118 image = copy;
119
120 // Now update properties so we free the copy after
121 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
122 }
123
124 // Pass on the image
125 *buffer = image;
126
127 return 0;
128 }
129
130 static uint8_t *producer_get_alpha_mask( mlt_frame this )
131 {
132 // Obtain properties of frame
133 mlt_properties properties = mlt_frame_properties( this );
134
135 // Return the alpha mask
136 return mlt_properties_get_data( properties, "alpha", NULL );
137 }
138
139 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
140 {
141 producer_pango this = producer->child;
142 GdkPixbuf *pixbuf = NULL;
143
144 // Generate a frame
145 *frame = mlt_frame_init( );
146
147 // Obtain properties of frame and producer
148 mlt_properties properties = mlt_frame_properties( *frame );
149 mlt_properties producer_props = mlt_producer_properties( producer );
150
151 // Get producer properties
152 int fg = mlt_properties_get_int( producer_props, "fgcolor" );
153 int bg = mlt_properties_get_int( producer_props, "bgcolor" );
154 int align = mlt_properties_get_int( producer_props, "align" );
155 int pad = mlt_properties_get_int( producer_props, "pad" );
156 char *markup = mlt_properties_get( producer_props, "markup" );
157 char *text = mlt_properties_get( producer_props, "text" );
158 char *font = mlt_properties_get( producer_props, "font" );
159
160 // See if any properties changed
161 int property_changed = ( fg != this->fgcolor );
162 property_changed = property_changed || ( bg != this->bgcolor );
163 property_changed = property_changed || ( align != this->align );
164 property_changed = property_changed || ( pad != this->pad );
165 property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
166 property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
167 property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
168
169 // Save the properties for next comparison
170 this->fgcolor = fg;
171 this->bgcolor = bg;
172 this->align = align;
173 this->pad = pad;
174 if ( markup != NULL )
175 {
176 if ( this->markup != NULL )
177 free( this->markup );
178 this->markup = strdup( markup );
179 }
180 if ( text != NULL )
181 {
182 if ( this->text != NULL )
183 free( this->text );
184 this->text = strdup( text );
185 }
186 if ( font != NULL )
187 {
188 if ( this->font != NULL )
189 free( this->font );
190 this->font = strdup( font );
191 }
192
193 if ( property_changed )
194 {
195 rgba_color fgcolor =
196 {
197 ( fg & 0xff000000 ) >> 24,
198 ( fg & 0x00ff0000 ) >> 16,
199 ( fg & 0x0000ff00 ) >> 8,
200 ( fg & 0x000000ff )
201 };
202 rgba_color bgcolor =
203 {
204 ( bg & 0xff000000 ) >> 24,
205 ( bg & 0x00ff0000 ) >> 16,
206 ( bg & 0x0000ff00 ) >> 8,
207 ( bg & 0x000000ff )
208 };
209
210 // Render the title
211 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
212 }
213
214 // If we have a pixbuf
215 if ( pixbuf )
216 {
217 // Scale to adjust for sample aspect ratio
218 if ( mlt_properties_get_int( properties, "video_standard" ) == mlt_video_standard_pal )
219 {
220 GdkPixbuf *temp = pixbuf;
221 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
222 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 54.0/59.0),
223 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
224 pixbuf = scaled;
225 g_object_unref( temp );
226 }
227 else
228 {
229 GdkPixbuf *temp = pixbuf;
230 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
231 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 11.0/10.0 ),
232 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
233 pixbuf = scaled;
234 g_object_unref( temp );
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 g_object_unref( pixbuf );
268
269 // if single picture, reference the image and alpha in the producer
270 if ( this->image != NULL )
271 free( this->image );
272 this->image = image;
273 if ( this->alpha != NULL )
274 free( this->alpha );
275 this->alpha = alpha;
276
277 }
278
279 if ( this->image != NULL )
280 {
281 // Set width/height
282 mlt_properties_set_int( properties, "width", this->width );
283 mlt_properties_set_int( properties, "height", this->height );
284
285 // Set the compositing properties
286 mlt_properties_set_int( properties, "x", mlt_properties_get_int( producer_props, "x" ) );
287 mlt_properties_set_int( properties, "y", mlt_properties_get_int( producer_props, "y" ) );
288 mlt_properties_set_double( properties, "mix", mlt_properties_get_double( producer_props, "mix" ) );
289
290 // if picture sequence pass the image and alpha data without destructor
291 mlt_properties_set_data( properties, "image", this->image, 0, NULL, NULL );
292 mlt_properties_set_data( properties, "alpha", this->alpha, 0, NULL, NULL );
293
294 // Set alpha mask call back
295 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
296
297 // Stack the get image callback
298 mlt_frame_push_get_image( *frame, producer_get_image );
299 }
300
301 // Update timecode on the frame we're creating
302 mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
303
304 // Calculate the next timecode
305 mlt_producer_prepare_next( producer );
306
307 return 0;
308 }
309
310 static void producer_close( mlt_producer parent )
311 {
312 producer_pango this = parent->child;
313 if ( this->image != NULL )
314 free( this->image );
315 if ( this->alpha != NULL )
316 free( this->alpha );
317 if ( this->markup != NULL )
318 free( this->markup );
319 if ( this->text != NULL )
320 free( this->text );
321 if ( this->font != NULL )
322 free( this->font );
323 parent->close = NULL;
324 mlt_producer_close( parent );
325 free( this );
326 }
327
328 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
329 {
330 int ww = gdk_pixbuf_get_width( pixbuf );
331 int hh = gdk_pixbuf_get_height( pixbuf );
332 uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
333 int i, j;
334
335 for ( j = 0; j < hh; j++ )
336 {
337 for ( i = 0; i < ww; i++ )
338 {
339 *p++ = bg.r;
340 *p++ = bg.g;
341 *p++ = bg.b;
342 *p++ = bg.a;
343 }
344 }
345 }
346
347 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align )
348 {
349 PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
350 PangoContext *context = pango_ft2_font_map_create_context( fontmap );
351 PangoLayout *layout = pango_layout_new( context );
352 int w, h, x;
353 int i, j;
354 GdkPixbuf *pixbuf = NULL;
355 FT_Bitmap bitmap;
356 uint8_t *src = NULL;
357 uint8_t* dest = NULL;
358 int stride;
359
360 pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
361 pango_layout_set_width( layout, -1 ); // set wrapping constraints
362 pango_layout_set_font_description( layout, pango_font_description_from_string( font ) );
363 // pango_layout_set_spacing( layout, space );
364 pango_layout_set_alignment( layout, ( PangoAlignment ) align );
365 if ( markup != NULL && strcmp( markup, "" ) != 0 )
366 pango_layout_set_markup( layout, markup, strlen( markup ) );
367 else if ( text != NULL && strcmp( text, "" ) != 0 )
368 pango_layout_set_text( layout, text, strlen( text ) );
369 else
370 return NULL;
371 pango_layout_get_pixel_size( layout, &w, &h );
372
373 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
374 pango_draw_background( pixbuf, bg );
375
376 stride = gdk_pixbuf_get_rowstride( pixbuf );
377
378 bitmap.width = w;
379 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
380 bitmap.rows = h;
381 bitmap.buffer = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
382 bitmap.num_grays = 256;
383 bitmap.pixel_mode = ft_pixel_mode_grays;
384
385 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
386
387 src = bitmap.buffer;
388 x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
389 dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
390 for ( j = 0; j < h; j++ )
391 {
392 uint8_t *d = dest;
393 for ( i = 0; i < w; i++ )
394 {
395 float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
396 *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
397 *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
398 *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
399 *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
400 }
401 dest += stride;
402 }
403 free( bitmap.buffer );
404
405 g_object_unref( layout );
406 g_object_unref( context );
407 g_object_unref( fontmap );
408
409 return pixbuf;
410 }
411
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