research.m1stereo.tv/gitweb/ - melted/blob - 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         char *fgcolor;
  37         char *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( properties, "fgcolour", "0xffffffff" );
  76                 mlt_properties_set( properties, "bgcolour", "0x00000000" );
  77                 mlt_properties_set_int( properties, "align", pango_align_left );
  78                 mlt_properties_set_int( properties, "pad", 0 );
  79                 mlt_properties_set( properties, "text", "" );
  80                 mlt_properties_set( properties, "font", "Sans 48" );
  81
  82                 if ( filename == NULL )
  83                 {
  84                         mlt_properties_set( properties, "resource", "pango" );
  85                         mlt_properties_set( properties, "markup", "" );
  86                 }
  87                 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
  88                 {
  89                         char *copy = strdup( filename + 1 );
  90                         char *markup = copy;
  91                         if ( strstr( markup, "/+" ) )
  92                                 markup = strstr( markup, "/+" ) + 2;
  93                         ( *strrchr( markup, '.' ) ) = '\0';
  94                         while ( strchr( markup, '~' ) )
  95                                 ( *strchr( markup, '~' ) ) = '\n';
  96                         mlt_properties_set( properties, "resource", ( char * )filename );
  97                         mlt_properties_set( properties, "markup", markup );
  98                         free( copy );
  99                 }
 100                 else
 101                 {
 102                         FILE *f = fopen( filename, "r" );
 103                         if ( f != NULL )
 104                         {
 105                                 char line[81];
 106                                 char *markup = NULL;
 107                                 size_t size = 0;
 108                                 line[80] = '\0';
 109
 110                                 while ( fgets( line, 80, f ) )
 111                                 {
 112                                         size += strlen( line ) + 1;
 113                                         if ( markup )
 114                                         {
 115                                                 markup = realloc( markup, size );
 116                                                 strcat( markup, line );
 117                                         }
 118                                         else
 119                                         {
 120                                                 markup = strdup( line );
 121                                         }
 122                                 }
 123                                 fclose( f );
 124
 125                                 if ( markup[ strlen( markup ) - 1 ] == '\n' )
 126                                         markup[ strlen( markup ) - 1 ] = '\0';
 127
 128                                 mlt_properties_set( properties, "resource", ( char * ) filename );
 129                                 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
 130                                 free( markup );
 131                         }
 132                         else
 133                         {
 134                                 mlt_properties_set( properties, "resource", "pango" );
 135                                 mlt_properties_set( properties, "markup", "" );
 136                         }
 137                 }
 138
 139                 return producer;
 140         }
 141         free( this );
 142         return NULL;
 143 }
 144
 145 static void set_string( char **string, char *value, char *fallback )
 146 {
 147         if ( value != NULL )
 148         {
 149                 free( *string );
 150                 *string = strdup( value );
 151         }
 152         else if ( *string == NULL && fallback != NULL )
 153         {
 154                 *string = strdup( fallback );
 155         }
 156         else if ( *string != NULL && fallback == NULL )
 157         {
 158                 free( *string );
 159                 *string = NULL;
 160         }
 161 }
 162
 163 rgba_color parse_color( char *color )
 164 {
 165         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
 166
 167         if ( !strncmp( color, "0x", 2 ) )
 168         {
 169                 unsigned int temp = 0;
 170                 sscanf( color + 2, "%x", &temp );
 171                 result.r = ( temp >> 24 ) & 0xff;
 172                 result.g = ( temp >> 16 ) & 0xff;
 173                 result.b = ( temp >> 8 ) & 0xff;
 174                 result.a = ( temp ) & 0xff;
 175         }
 176         else if ( !strcmp( color, "red" ) )
 177         {
 178                 result.r = 0xff;
 179                 result.g = 0x00;
 180                 result.b = 0x00;
 181         }
 182         else if ( !strcmp( color, "green" ) )
 183         {
 184                 result.r = 0x00;
 185                 result.g = 0xff;
 186                 result.b = 0x00;
 187         }
 188         else if ( !strcmp( color, "blue" ) )
 189         {
 190                 result.r = 0x00;
 191                 result.g = 0x00;
 192                 result.b = 0xff;
 193         }
 194         else
 195         {
 196                 unsigned int temp = 0;
 197                 sscanf( color, "%d", &temp );
 198                 result.r = ( temp >> 24 ) & 0xff;
 199                 result.g = ( temp >> 16 ) & 0xff;
 200                 result.b = ( temp >> 8 ) & 0xff;
 201                 result.a = ( temp ) & 0xff;
 202         }
 203
 204         return result;
 205 }
 206
 207 static void refresh_image( mlt_frame frame, int width, int height )
 208 {
 209         // Pixbuf
 210         GdkPixbuf *pixbuf = NULL;
 211
 212         // Obtain properties of frame
 213         mlt_properties properties = mlt_frame_properties( frame );
 214
 215         // Obtain the producer pango for this frame
 216         producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
 217
 218         // Obtain the producer
 219         mlt_producer producer = &this->parent;
 220
 221         // Obtain the producer properties
 222         mlt_properties producer_props = mlt_producer_properties( producer );
 223
 224         // Get producer properties
 225         char *fg = mlt_properties_get( producer_props, "fgcolour" );
 226         char *bg = mlt_properties_get( producer_props, "bgcolour" );
 227         int align = mlt_properties_get_int( producer_props, "align" );
 228         int pad = mlt_properties_get_int( producer_props, "pad" );
 229         char *markup = mlt_properties_get( producer_props, "markup" );
 230         char *text = mlt_properties_get( producer_props, "text" );
 231         char *font = mlt_properties_get( producer_props, "font" );
 232
 233         // See if any properties changed
 234         int property_changed = ( this->fgcolor == NULL || strcmp( fg, this->fgcolor ) );
 235         property_changed = property_changed || ( this->bgcolor == NULL || strcmp( bg, this->bgcolor ) );
 236         property_changed = property_changed || ( align != this->align );
 237         property_changed = property_changed || ( pad != this->pad );
 238         property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
 239         property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
 240         property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
 241
 242         // Save the properties for next comparison
 243         this->align = align;
 244         this->pad = pad;
 245         set_string( &this->fgcolor, fg, "0xffffffff" );
 246         set_string( &this->bgcolor, bg, "0x00000000" );
 247         set_string( &this->markup, markup, NULL );
 248         set_string( &this->text, text, NULL );
 249         set_string( &this->font, font, "Sans 48" );
 250
 251         if ( property_changed )
 252         {
 253                 rgba_color fgcolor = parse_color( this->fgcolor );
 254                 rgba_color bgcolor = parse_color( this->bgcolor );
 255
 256                 free( this->image );
 257                 free( this->alpha );
 258                 this->image = NULL;
 259                 this->alpha = NULL;
 260
 261                 // Render the title
 262                 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
 263
 264                 if ( pixbuf != NULL )
 265                 {
 266                         // Register this pixbuf for destruction and reuse
 267                         mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
 268
 269                         mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
 270                         mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
 271
 272                         // Store the width/height of the pixbuf temporarily
 273                         this->width = gdk_pixbuf_get_width( pixbuf );
 274                         this->height = gdk_pixbuf_get_height( pixbuf );
 275
 276                         mlt_properties_set_int( producer_props, "bpp", gdk_pixbuf_get_has_alpha( pixbuf ) ? 4 : 3 );
 277                 }
 278         }
 279         else if ( this->image == NULL || width != this->width || height != this->height )
 280         {
 281                 free( this->image );
 282                 free( this->alpha );
 283                 this->image = NULL;
 284                 this->alpha = NULL;
 285
 286                 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
 287                 mlt_properties_set_int( producer_props, "bpp", gdk_pixbuf_get_has_alpha( pixbuf ) ? 4 : 3 );
 288         }
 289
 290         int bpp = mlt_properties_get_int( producer_props, "bpp" );
 291
 292         // If we have a pixbuf and a valid width
 293         if ( pixbuf && width > 0 )
 294         {
 295                 // Note - the original pixbuf is already safe and ready for destruction
 296                 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, GDK_INTERP_NEAREST );
 297
 298                 // Store width and height
 299                 this->width = width;
 300                 this->height = height;
 301
 302                 // Allocate/define image
 303                 // IRRIGATE ME
 304                 uint8_t *image = malloc( width * ( height + 1 ) * bpp );
 305                 uint8_t *alpha = NULL;
 306
 307                 // Allocate the alpha mask
 308                 alpha = malloc( this->width * this->height );
 309
 310                 // Convert the image
 311                 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 312                                                                           this->width, this->height,
 313                                                                           gdk_pixbuf_get_rowstride( pixbuf ),
 314                                                                           image, alpha );
 315
 316                 // Finished with pixbuf now
 317                 g_object_unref( pixbuf );
 318
 319                 // reference the image in the producer
 320                 this->image = image;
 321                 this->alpha = alpha;
 322         }
 323
 324         // Set width/height
 325         mlt_properties_set_int( properties, "width", this->width );
 326         mlt_properties_set_int( properties, "height", this->height );
 327         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
 328         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
 329
 330         // pass the image data without destructor
 331         mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * bpp, NULL, NULL );
 332         mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
 333 }
 334
 335 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 336 {
 337         // Obtain properties of frame
 338         mlt_properties properties = mlt_frame_properties( frame );
 339
 340         *width = mlt_properties_get_int( properties, "rescale_width" );
 341         *height = mlt_properties_get_int( properties, "rescale_height" );
 342
 343         // Refresh the image
 344         refresh_image( frame, *width, *height );
 345
 346         // Determine format
 347         //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
 348         //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
 349
 350         // May need to know the size of the image to clone it
 351         int size = 0;
 352
 353         // Get the image
 354         uint8_t *image = mlt_properties_get_data( properties, "image", &size );
 355
 356         // Get width and height
 357         *width = mlt_properties_get_int( properties, "width" );
 358         *height = mlt_properties_get_int( properties, "height" );
 359
 360         // Clone if necessary
 361         if ( writable )
 362         {
 363                 // Clone our image
 364                 // IRRIGATE ME
 365                 uint8_t *copy = malloc( size );
 366                 memcpy( copy, image, size );
 367
 368                 // We're going to pass the copy on
 369                 image = copy;
 370
 371                 // Now update properties so we free the copy after
 372                 mlt_properties_set_data( properties, "image", copy, size, free, NULL );
 373         }
 374
 375         // Pass on the image
 376         *buffer = image;
 377
 378         return 0;
 379 }
 380
 381 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 382 {
 383         // Obtain properties of frame
 384         mlt_properties properties = mlt_frame_properties( this );
 385
 386         // Return the alpha mask
 387         return mlt_properties_get_data( properties, "alpha", NULL );
 388 }
 389
 390 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 391 {
 392         producer_pango this = producer->child;
 393
 394         // Generate a frame
 395         *frame = mlt_frame_init( );
 396
 397         // Obtain properties of frame and producer
 398         mlt_properties properties = mlt_frame_properties( *frame );
 399
 400         // Set the producer on the frame properties
 401         mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
 402
 403         // Refresh the pango image
 404         refresh_image( *frame, 0, 0 );
 405
 406         // Set producer-specific frame properties
 407         mlt_properties_set_int( properties, "progressive", 1 );
 408         mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( properties, "real_width" ) / mlt_properties_get_double( properties, "real_height" ) );
 409
 410         // Set alpha call back
 411         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 412
 413         // Stack the get image callback
 414         mlt_frame_push_get_image( *frame, producer_get_image );
 415
 416         // Update timecode on the frame we're creating
 417         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 418
 419         // Calculate the next timecode
 420         mlt_producer_prepare_next( producer );
 421
 422         return 0;
 423 }
 424
 425 static void producer_close( mlt_producer parent )
 426 {
 427         producer_pango this = parent->child;
 428         free( this->image );
 429         free( this->alpha );
 430         free( this->fgcolor );
 431         free( this->bgcolor );
 432         free( this->markup );
 433         free( this->text );
 434         free( this->font );
 435         parent->close = NULL;
 436         mlt_producer_close( parent );
 437         free( this );
 438 }
 439
 440 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
 441 {
 442         int ww = gdk_pixbuf_get_width( pixbuf );
 443         int hh = gdk_pixbuf_get_height( pixbuf );
 444         uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
 445         int i, j;
 446
 447         for ( j = 0; j < hh; j++ )
 448         {
 449                 for ( i = 0; i < ww; i++ )
 450                 {
 451                         *p++ = bg.r;
 452                         *p++ = bg.g;
 453                         *p++ = bg.b;
 454                         *p++ = bg.a;
 455                 }
 456         }
 457 }
 458
 459 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align )
 460 {
 461         PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
 462         PangoContext *context = pango_ft2_font_map_create_context( fontmap );
 463         PangoLayout *layout = pango_layout_new( context );
 464         int w, h, x;
 465         int i, j;
 466         GdkPixbuf *pixbuf = NULL;
 467         FT_Bitmap bitmap;
 468         uint8_t *src = NULL;
 469         uint8_t* dest = NULL;
 470         int stride;
 471
 472         pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
 473         pango_layout_set_width( layout, -1 ); // set wrapping constraints
 474         pango_layout_set_font_description( layout, pango_font_description_from_string( font ) );
 475 //      pango_layout_set_spacing( layout, space );
 476         pango_layout_set_alignment( layout, ( PangoAlignment ) align  );
 477         if ( markup != NULL && strcmp( markup, "" ) != 0 )
 478                 pango_layout_set_markup( layout, markup, strlen( markup ) );
 479         else if ( text != NULL && strcmp( text, "" ) != 0 )
 480                 pango_layout_set_text( layout, text, strlen( text ) );
 481         else
 482                 return NULL;
 483         pango_layout_get_pixel_size( layout, &w, &h );
 484
 485         pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
 486         pango_draw_background( pixbuf, bg );
 487
 488         stride = gdk_pixbuf_get_rowstride( pixbuf );
 489
 490         bitmap.width     = w;
 491         bitmap.pitch     = 32 * ( ( w + 31 ) / 31 );
 492         bitmap.rows      = h;
 493         bitmap.buffer    = ( unsigned char * ) calloc( 1, h * bitmap.pitch );
 494         bitmap.num_grays = 256;
 495         bitmap.pixel_mode = ft_pixel_mode_grays;
 496
 497         pango_ft2_render_layout( &bitmap, layout, 0, 0 );
 498
 499         src = bitmap.buffer;
 500         x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
 501         dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
 502         for ( j = 0; j < h; j++ )
 503         {
 504                 uint8_t *d = dest;
 505                 for ( i = 0; i < w; i++ )
 506                 {
 507                         float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
 508                         *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
 509                         *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
 510                         *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
 511                         *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
 512                 }
 513                 dest += stride;
 514         }
 515         free( bitmap.buffer );
 516
 517         g_object_unref( layout );
 518         g_object_unref( context );
 519         g_object_unref( fontmap );
 520
 521         return pixbuf;
 522 }
 523