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 );
61 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
63 // Obtain properties of frame
64 mlt_properties properties = mlt_frame_properties( this );
66 // May need to know the size of the image to clone it
70 uint8_t *image = mlt_properties_get_data( properties, "image", &size );
72 // Get width and height
73 *width = mlt_properties_get_int( properties, "width" );
74 *height = mlt_properties_get_int( properties, "height" );
80 uint8_t *copy = malloc( size );
81 memcpy( copy, image, size );
83 // We're going to pass the copy on
86 // Now update properties so we free the copy after
87 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
96 static uint8_t *producer_get_alpha_mask( mlt_frame this )
98 // Obtain properties of frame
99 mlt_properties properties = mlt_frame_properties( this );
101 // Return the alpha mask
102 return mlt_properties_get_data( properties, "alpha", NULL );
105 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
107 producer_pango this = producer->child;
108 GdkPixbuf *pixbuf = NULL;
111 *frame = mlt_frame_init( );
113 // Obtain properties of frame
114 mlt_properties properties = mlt_frame_properties( *frame );
116 // optimization for subsequent iterations on single picture
117 if ( this->image != NULL )
120 mlt_properties_set_int( properties, "width", this->width );
121 mlt_properties_set_int( properties, "height", this->height );
123 // if picture sequence pass the image and alpha data without destructor
124 mlt_properties_set_data( properties, "image", this->image, 0, NULL, NULL );
125 mlt_properties_set_data( properties, "alpha", this->alpha, 0, NULL, NULL );
127 // Set alpha mask call back
128 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
130 // Stack the get image callback
131 mlt_frame_push_get_image( *frame, producer_get_image );
136 // the following four will be replaced by properties
137 rgba_color fg = { 0xff, 0xff, 0xff, 0xff };
138 rgba_color bg = { 0, 0, 0, 0x7f };
140 int align = 0; /* left */
143 pixbuf = pango_get_pixbuf( this->markup, fg, bg, pad, align );
146 // If we have a pixbuf
149 // Scale to adjust for sample aspect ratio
152 GdkPixbuf *temp = pixbuf;
153 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
154 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 54.0/59.0),
155 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
157 g_object_unref( temp );
161 GdkPixbuf *temp = pixbuf;
162 GdkPixbuf *scaled = gdk_pixbuf_scale_simple( pixbuf,
163 (gint) ( (float) gdk_pixbuf_get_width( pixbuf ) * 11.0/10.0 ),
164 gdk_pixbuf_get_height( pixbuf ), GDK_INTERP_HYPER );
166 g_object_unref( temp );
169 // Store width and height
170 this->width = gdk_pixbuf_get_width( pixbuf );
171 this->height = gdk_pixbuf_get_height( pixbuf );
173 // Allocate/define image and alpha
174 uint8_t *image = malloc( this->width * this->height * 2 );
175 uint8_t *alpha = NULL;
177 // Extract YUV422 and alpha
178 if ( gdk_pixbuf_get_has_alpha( pixbuf ) )
180 // Allocate the alpha mask
181 alpha = malloc( this->width * this->height );
184 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
185 this->width, this->height,
186 gdk_pixbuf_get_rowstride( pixbuf ),
191 // No alpha to extract
192 mlt_convert_rgb24_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
193 this->width, this->height,
194 gdk_pixbuf_get_rowstride( pixbuf ),
198 // Finished with pixbuf now
199 g_object_unref( pixbuf );
201 // Set width/height of frame
202 mlt_properties_set_int( properties, "width", this->width );
203 mlt_properties_set_int( properties, "height", this->height );
205 // if single picture, reference the image and alpha in the producer
209 // pass the image and alpha data without destructor
210 mlt_properties_set_data( properties, "image", image, 0, NULL, NULL );
211 mlt_properties_set_data( properties, "alpha", alpha, 0, NULL, NULL );
213 // Set alpha call back
214 ( *frame )->get_alpha_mask = producer_get_alpha_mask;
216 // Push the get_image method
217 mlt_frame_push_get_image( *frame, producer_get_image );
220 // Update timecode on the frame we're creating
221 mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
223 // Calculate the next timecode
224 mlt_producer_prepare_next( producer );
229 static void producer_close( mlt_producer parent )
231 producer_pango this = parent->child;
233 free( this->markup );
238 parent->close = NULL;
239 mlt_producer_close( parent );
243 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
245 int ww = gdk_pixbuf_get_width( pixbuf );
246 int hh = gdk_pixbuf_get_height( pixbuf );
247 uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
250 for ( j = 0; j < hh; j++ )
252 for ( i = 0; i < ww; i++ )
262 static GdkPixbuf *pango_get_pixbuf( const char *markup, rgba_color fg, rgba_color bg, int pad, int align )
264 PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
265 PangoContext *context = pango_ft2_font_map_create_context( fontmap );
266 PangoLayout *layout = pango_layout_new( context );
267 // PangoFontDescription *font;
270 GdkPixbuf *pixbuf = NULL;
273 uint8_t* dest = NULL;
276 pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
277 pango_layout_set_width( layout, -1 ); // set wrapping constraints
278 // pango_layout_set_font_description( layout, "Sans 48" );
279 // pango_layout_set_spacing( layout, space );
280 pango_layout_set_alignment( layout, ( PangoAlignment ) align );
281 pango_layout_set_markup( layout, markup, (markup == NULL ? 0 : strlen( markup ) ) );
282 pango_layout_get_pixel_size( layout, &w, &h );
284 pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
285 pango_draw_background( pixbuf, bg );
287 stride = gdk_pixbuf_get_rowstride( pixbuf );
290 bitmap.pitch = 32 * ( ( w + 31 ) / 31 );
292 bitmap.buffer = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
293 bitmap.num_grays = 256;
294 bitmap.pixel_mode = ft_pixel_mode_grays;
296 pango_ft2_render_layout( &bitmap, layout, 0, 0 );
299 x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
300 dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
301 for ( j = 0; j < h; j++ )
304 for ( i = 0; i < w; i++ )
306 float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
307 *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
308 *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
309 *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
310 *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
314 free( bitmap.buffer );
316 g_object_unref( layout );
317 g_object_unref( context );
318 g_object_unref( fontmap );