2 * producer_pango.c -- a pango-based titler
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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.
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.
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.
21 #include "producer_pango.h"
22 #include <framework/mlt_frame.h>
25 #include <gdk-pixbuf/gdk-pixbuf.h>
26 #include <pango/pangoft2.h>
27 #include <freetype/freetype.h>
29 // special color type used by internal pango routines
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
);
41 mlt_producer
producer_pango_init( const char *markup
)
43 producer_pango
this = calloc( sizeof( struct producer_pango_s
), 1 );
44 if ( this != NULL
&& mlt_producer_init( &this->parent
, this ) == 0 )
46 mlt_producer producer
= &this->parent
;
48 producer
->get_frame
= producer_get_frame
;
49 producer
->close
= producer_close
;
51 this->markup
= strdup( markup
);
54 // Get the properties interface
55 mlt_properties properties
= mlt_producer_properties( &this->parent
);
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 );
70 static int producer_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
72 // Obtain properties of frame
73 mlt_properties properties
= mlt_frame_properties( this );
75 // May need to know the size of the image to clone it
79 uint8_t *image
= mlt_properties_get_data( properties
, "image", &size
);
81 // Get width and height
82 *width
= mlt_properties_get_int( properties
, "width" );
83 *height
= mlt_properties_get_int( properties
, "height" );
89 uint8_t *copy
= malloc( size
);
90 memcpy( copy
, image
, size
);
92 // We're going to pass the copy on
95 // Now update properties so we free the copy after
96 mlt_properties_set_data( properties
, "image", copy
, size
, free
, NULL
);
105 static uint8_t *producer_get_alpha_mask( mlt_frame
this )
107 // Obtain properties of frame
108 mlt_properties properties
= mlt_frame_properties( this );
110 // Return the alpha mask
111 return mlt_properties_get_data( properties
, "alpha", NULL
);
114 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
116 producer_pango
this = producer
->child
;
117 GdkPixbuf
*pixbuf
= NULL
;
120 *frame
= mlt_frame_init( );
122 // Obtain properties of frame
123 mlt_properties properties
= mlt_frame_properties( *frame
);
125 // optimization for subsequent iterations on single picture
126 if ( this->image
!= NULL
)
129 mlt_properties_set_int( properties
, "width", this->width
);
130 mlt_properties_set_int( properties
, "height", this->height
);
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
);
136 // Set alpha mask call back
137 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
139 // Stack the get image callback
140 mlt_frame_push_get_image( *frame
, producer_get_image
);
145 // Obtain properties of producer
146 mlt_properties props
= mlt_producer_properties( producer
);
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" );
155 ( fg
& 0xff000000 ) >> 24,
156 ( fg
& 0x00ff0000 ) >> 16,
157 ( fg
& 0x0000ff00 ) >> 8,
162 ( bg
& 0xff000000 ) >> 24,
163 ( bg
& 0x00ff0000 ) >> 16,
164 ( bg
& 0x0000ff00 ) >> 8,
169 pixbuf
= pango_get_pixbuf( this->markup
, fgcolor
, bgcolor
, pad
, align
);
172 // If we have a pixbuf
175 // Scale to adjust for sample aspect ratio
176 if ( mlt_properties_get_int( properties
, "video_standard" ) == mlt_video_standard_pal
)
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
);
183 g_object_unref( temp
);
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
);
192 g_object_unref( temp
);
195 // Store width and height
196 this->width
= gdk_pixbuf_get_width( pixbuf
);
197 this->height
= gdk_pixbuf_get_height( pixbuf
);
199 // Allocate/define image and alpha
200 uint8_t *image
= malloc( this->width
* this->height
* 2 );
201 uint8_t *alpha
= NULL
;
203 // Extract YUV422 and alpha
204 if ( gdk_pixbuf_get_has_alpha( pixbuf
) )
206 // Allocate the alpha mask
207 alpha
= malloc( this->width
* this->height
);
210 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf
),
211 this->width
, this->height
,
212 gdk_pixbuf_get_rowstride( pixbuf
),
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
),
224 // Finished with pixbuf now
225 g_object_unref( pixbuf
);
227 // Set width/height of frame
228 mlt_properties_set_int( properties
, "width", this->width
);
229 mlt_properties_set_int( properties
, "height", this->height
);
231 // if single picture, reference the image and alpha in the producer
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
);
239 // Set alpha call back
240 ( *frame
)->get_alpha_mask
= producer_get_alpha_mask
;
242 // Push the get_image method
243 mlt_frame_push_get_image( *frame
, producer_get_image
);
246 // Update timecode on the frame we're creating
247 mlt_frame_set_timecode( *frame
, mlt_producer_position( producer
) );
249 // Calculate the next timecode
250 mlt_producer_prepare_next( producer
);
255 static void producer_close( mlt_producer parent
)
257 producer_pango
this = parent
->child
;
259 free( this->markup
);
264 parent
->close
= NULL
;
265 mlt_producer_close( parent
);
269 static void pango_draw_background( GdkPixbuf
*pixbuf
, rgba_color bg
)
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
);
276 for ( j
= 0; j
< hh
; j
++ )
278 for ( i
= 0; i
< ww
; i
++ )
288 static GdkPixbuf
*pango_get_pixbuf( const char *markup
, rgba_color fg
, rgba_color bg
, int pad
, int align
)
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;
296 GdkPixbuf
*pixbuf
= NULL
;
299 uint8_t* dest
= NULL
;
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
);
310 pixbuf
= gdk_pixbuf_new( GDK_COLORSPACE_RGB
, TRUE
/* has alpha */, 8, w
+ 2 * pad
, h
+ 2 * pad
);
311 pango_draw_background( pixbuf
, bg
);
313 stride
= gdk_pixbuf_get_rowstride( pixbuf
);
316 bitmap
.pitch
= 32 * ( ( w
+ 31 ) / 31 );
318 bitmap
.buffer
= ( unsigned char * ) calloc( 1, h
* bitmap
.pitch
);
319 bitmap
.num_grays
= 256;
320 bitmap
.pixel_mode
= ft_pixel_mode_grays
;
322 pango_ft2_render_layout( &bitmap
, layout
, 0, 0 );
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
++ )
330 for ( i
= 0; i
< w
; i
++ )
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
);
340 free( bitmap
.buffer
);
342 g_object_unref( layout
);
343 g_object_unref( context
);
344 g_object_unref( fontmap
);