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add video_standard enum to mlt_frame, add mlt_consumer_properties, add properties...
[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 // special color type used by internal pango routines
30 typedef struct
31 {
32 uint8_t r, g, b, a;
33 } rgba_color;
34
35 // Forward declarations
36 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
37 static void producer_close( mlt_producer parent );
38 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
39 static GdkPixbuf *pango_get_pixbuf( const char *markup, rgba_color fg, rgba_color bg, int pad, int align );
40
41 mlt_producer producer_pango_init( const char *markup )
42 {
43 producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
44 if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
45 {
46 mlt_producer producer = &this->parent;
47
48 producer->get_frame = producer_get_frame;
49 producer->close = producer_close;
50
51 this->markup = strdup( markup );
52 g_type_init();
53
54 // Get the properties interface
55 mlt_properties properties = mlt_producer_properties( &this->parent );
56
57 // Set the default properties
58 mlt_properties_set_int( properties, "video_standard", mlt_video_standard_pal );
59 mlt_properties_set_int( properties, "fgcolor", 0xffffffff );
60 mlt_properties_set_int( properties, "bgcolor", 0x00000000 );
61 mlt_properties_set_int( properties, "align", pango_align_left );
62 mlt_properties_set_int( properties, "pad", 0 );
63
64 return producer;
65 }
66 free( this );
67 return NULL;
68 }
69
70 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
71 {
72 // Obtain properties of frame
73 mlt_properties properties = mlt_frame_properties( this );
74
75 // May need to know the size of the image to clone it
76 int size = 0;
77
78 // Get the image
79 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
80
81 // Get width and height
82 *width = mlt_properties_get_int( properties, "width" );
83 *height = mlt_properties_get_int( properties, "height" );
84
85 // Clone if necessary
86 if ( writable )
87 {
88 // Clone our image
89 uint8_t *copy = malloc( size );
90 memcpy( copy, image, size );
91
92 // We're going to pass the copy on
93 image = copy;
94
95 // Now update properties so we free the copy after
96 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
97 }
98
99 // Pass on the image
100 *buffer = image;
101
102 return 0;
103 }
104
105 static uint8_t *producer_get_alpha_mask( mlt_frame this )
106 {
107 // Obtain properties of frame
108 mlt_properties properties = mlt_frame_properties( this );
109
110 // Return the alpha mask
111 return mlt_properties_get_data( properties, "alpha", NULL );
112 }
113
114 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
115 {
116 producer_pango this = producer->child;
117 GdkPixbuf *pixbuf = NULL;
118
119 // Generate a frame
120 *frame = mlt_frame_init( );
121
122 // Obtain properties of frame
123 mlt_properties properties = mlt_frame_properties( *frame );
124
125 // optimization for subsequent iterations on single picture
126 if ( this->image != NULL )
127 {
128 // Set width/height
129 mlt_properties_set_int( properties, "width", this->width );
130 mlt_properties_set_int( properties, "height", this->height );
131
132 // if picture sequence pass the image and alpha data without destructor
133 mlt_properties_set_data( properties, "image", this->image, 0, NULL, NULL );
134 mlt_properties_set_data( properties, "alpha", this->alpha, 0, NULL, NULL );
135
136 // Set alpha mask call back
137 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
138
139 // Stack the get image callback
140 mlt_frame_push_get_image( *frame, producer_get_image );
141
142 }
143 else
144 {
145 // Obtain properties of producer
146 mlt_properties props = mlt_producer_properties( producer );
147
148 // Get properties
149 int fg = mlt_properties_get_int( props, "fgcolor" );
150 int bg = mlt_properties_get_int( props, "bgcolor" );
151 int align = mlt_properties_get_int( props, "align" );
152 int pad = mlt_properties_get_int( props, "pad" );
153 rgba_color fgcolor =
154 {
155 ( fg & 0xff000000 ) >> 24,
156 ( fg & 0x00ff0000 ) >> 16,
157 ( fg & 0x0000ff00 ) >> 8,
158 ( fg & 0x000000ff )
159 };
160 rgba_color bgcolor =
161 {
162 ( bg & 0xff000000 ) >> 24,
163 ( bg & 0x00ff0000 ) >> 16,
164 ( bg & 0x0000ff00 ) >> 8,
165 ( bg & 0x000000ff )
166 };
167
168 // Render the title
169 pixbuf = pango_get_pixbuf( this->markup, fgcolor, bgcolor, pad, align );
170 }
171
172 // If we have a pixbuf
173 if ( pixbuf )
174 {
175 // Scale to adjust for sample aspect ratio
176 if ( mlt_properties_get_int( properties, "video_standard" ) == mlt_video_standard_pal )
177 {
178 GdkPixbuf *temp = pixbuf;
179 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
180 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 54.0/59.0),
181 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
182 pixbuf = scaled;
183 g_object_unref( temp );
184 }
185 else
186 {
187 GdkPixbuf *temp = pixbuf;
188 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
189 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 11.0/10.0 ),
190 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
191 pixbuf = scaled;
192 g_object_unref( temp );
193 }
194
195 // Store width and height
196 this->width = gdk_pixbuf_get_width( pixbuf );
197 this->height = gdk_pixbuf_get_height( pixbuf );
198
199 // Allocate/define image and alpha
200 uint8_t *image = malloc( this->width * this->height * 2 );
201 uint8_t *alpha = NULL;
202
203 // Extract YUV422 and alpha
204 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
205 {
206 // Allocate the alpha mask
207 alpha = malloc( this->width * this->height );
208
209 // Convert the image
210 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
211 this->width, this->height,
212 gdk_pixbuf_get_rowstride( pixbuf ),
213 image, alpha );
214 }
215 else
216 {
217 // No alpha to extract
218 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
219 this->width, this->height,
220 gdk_pixbuf_get_rowstride( pixbuf ),
221 image );
222 }
223
224 // Finished with pixbuf now
225 g_object_unref( pixbuf );
226
227 // Set width/height of frame
228 mlt_properties_set_int( properties, "width", this->width );
229 mlt_properties_set_int( properties, "height", this->height );
230
231 // if single picture, reference the image and alpha in the producer
232 this->image = image;
233 this->alpha = alpha;
234
235 // pass the image and alpha data without destructor
236 mlt_properties_set_data( properties, "image", image, 0, NULL, NULL );
237 mlt_properties_set_data( properties, "alpha", alpha, 0, NULL, NULL );
238
239 // Set alpha call back
240 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
241
242 // Push the get_image method
243 mlt_frame_push_get_image( *frame, producer_get_image );
244 }
245
246 // Update timecode on the frame we're creating
247 mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
248
249 // Calculate the next timecode
250 mlt_producer_prepare_next( producer );
251
252 return 0;
253 }
254
255 static void producer_close( mlt_producer parent )
256 {
257 producer_pango this = parent->child;
258 if ( this->markup )
259 free( this->markup );
260 if ( this->image )
261 free( this->image );
262 if ( this->alpha )
263 free( this->alpha );
264 parent->close = NULL;
265 mlt_producer_close( parent );
266 free( this );
267 }
268
269 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
270 {
271 int ww = gdk_pixbuf_get_width( pixbuf );
272 int hh = gdk_pixbuf_get_height( pixbuf );
273 uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
274 int i, j;
275
276 for ( j = 0; j < hh; j++ )
277 {
278 for ( i = 0; i < ww; i++ )
279 {
280 *p++ = bg.r;
281 *p++ = bg.g;
282 *p++ = bg.b;
283 *p++ = bg.a;
284 }
285 }
286 }
287
288 static GdkPixbuf *pango_get_pixbuf( const char *markup, rgba_color fg, rgba_color bg, int pad, int align )
289 {
290 PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
291 PangoContext *context = pango_ft2_font_map_create_context( fontmap );
292 PangoLayout *layout = pango_layout_new( context );
293 // PangoFontDescription *font;
294 int w, h, x;
295 int i, j;
296 GdkPixbuf *pixbuf = NULL;
297 FT_Bitmap bitmap;
298 uint8_t *src = NULL;
299 uint8_t* dest = NULL;
300 int stride;
301
302 pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
303 pango_layout_set_width( layout, -1 ); // set wrapping constraints
304 // pango_layout_set_font_description( layout, "Sans 48" );
305 // pango_layout_set_spacing( layout, space );
306 pango_layout_set_alignment( layout, ( PangoAlignment ) align );
307 pango_layout_set_markup( layout, markup, (markup == NULL ? 0 : strlen( markup ) ) );
308 pango_layout_get_pixel_size( layout, &w, &h );
309
310 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
311 pango_draw_background( pixbuf, bg );
312
313 stride = gdk_pixbuf_get_rowstride( pixbuf );
314
315 bitmap.width = w;
316 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
317 bitmap.rows = h;
318 bitmap.buffer = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
319 bitmap.num_grays = 256;
320 bitmap.pixel_mode = ft_pixel_mode_grays;
321
322 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
323
324 src = bitmap.buffer;
325 x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
326 dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
327 for ( j = 0; j < h; j++ )
328 {
329 uint8_t *d = dest;
330 for ( i = 0; i < w; i++ )
331 {
332 float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
333 *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
334 *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
335 *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
336 *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
337 }
338 dest += stride;
339 }
340 free( bitmap.buffer );
341
342 g_object_unref( layout );
343 g_object_unref( context );
344 g_object_unref( fontmap );
345
346 return pixbuf;
347 }
348
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