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 /** Parse the alignment property.
  59 */
  60
  61 static int alignment_parse( char* align )
  62 {
  63         int ret = pango_align_left;
  64
  65         if ( align == NULL );
  66         else if ( isdigit( align[ 0 ] ) )
  67                 ret = atoi( align );
  68         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  69                 ret = pango_align_center;
  70         else if ( align[ 0 ] == 'r' )
  71                 ret = pango_align_right;
  72
  73         return ret;
  74 }
  75
  76 mlt_producer producer_pango_init( const char *filename )
  77 {
  78         producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
  79         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  80         {
  81                 mlt_producer producer = &this->parent;
  82
  83                 producer->get_frame = producer_get_frame;
  84                 producer->close = producer_close;
  85
  86                 // This is required to initialise gdk-pixbuf
  87                 g_type_init();
  88
  89                 // Get the properties interface
  90                 mlt_properties properties = mlt_producer_properties( &this->parent );
  91
  92                 // Set the default properties
  93                 mlt_properties_set( properties, "fgcolour", "0xffffffff" );
  94                 mlt_properties_set( properties, "bgcolour", "0x00000000" );
  95                 mlt_properties_set_int( properties, "align", pango_align_left );
  96                 mlt_properties_set_int( properties, "pad", 0 );
  97                 mlt_properties_set( properties, "text", "" );
  98                 mlt_properties_set( properties, "font", "Sans 48" );
  99
 100                 if ( filename == NULL )
 101                 {
 102                         mlt_properties_set( properties, "resource", "pango" );
 103                         mlt_properties_set( properties, "markup", "" );
 104                 }
 105                 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
 106                 {
 107                         char *copy = strdup( filename + 1 );
 108                         char *markup = copy;
 109                         if ( strstr( markup, "/+" ) )
 110                                 markup = strstr( markup, "/+" ) + 2;
 111                         ( *strrchr( markup, '.' ) ) = '\0';
 112                         while ( strchr( markup, '~' ) )
 113                                 ( *strchr( markup, '~' ) ) = '\n';
 114                         mlt_properties_set( properties, "resource", ( char * )filename );
 115                         mlt_properties_set( properties, "markup", markup );
 116                         free( copy );
 117                 }
 118                 else
 119                 {
 120                         FILE *f = fopen( filename, "r" );
 121                         if ( f != NULL )
 122                         {
 123                                 char line[81];
 124                                 char *markup = NULL;
 125                                 size_t size = 0;
 126                                 line[80] = '\0';
 127
 128                                 while ( fgets( line, 80, f ) )
 129                                 {
 130                                         size += strlen( line ) + 1;
 131                                         if ( markup )
 132                                         {
 133                                                 markup = realloc( markup, size );
 134                                                 strcat( markup, line );
 135                                         }
 136                                         else
 137                                         {
 138                                                 markup = strdup( line );
 139                                         }
 140                                 }
 141                                 fclose( f );
 142
 143                                 if ( markup[ strlen( markup ) - 1 ] == '\n' )
 144                                         markup[ strlen( markup ) - 1 ] = '\0';
 145
 146                                 mlt_properties_set( properties, "resource", ( char * ) filename );
 147                                 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
 148                                 free( markup );
 149                         }
 150                         else
 151                         {
 152                                 mlt_properties_set( properties, "resource", "pango" );
 153                                 mlt_properties_set( properties, "markup", "" );
 154                         }
 155                 }
 156
 157                 return producer;
 158         }
 159         free( this );
 160         return NULL;
 161 }
 162
 163 static void set_string( char **string, char *value, char *fallback )
 164 {
 165         if ( value != NULL )
 166         {
 167                 free( *string );
 168                 *string = strdup( value );
 169         }
 170         else if ( *string == NULL && fallback != NULL )
 171         {
 172                 *string = strdup( fallback );
 173         }
 174         else if ( *string != NULL && fallback == NULL )
 175         {
 176                 free( *string );
 177                 *string = NULL;
 178         }
 179 }
 180
 181 rgba_color parse_color( char *color )
 182 {
 183         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
 184
 185         if ( !strncmp( color, "0x", 2 ) )
 186         {
 187                 unsigned int temp = 0;
 188                 sscanf( color + 2, "%x", &temp );
 189                 result.r = ( temp >> 24 ) & 0xff;
 190                 result.g = ( temp >> 16 ) & 0xff;
 191                 result.b = ( temp >> 8 ) & 0xff;
 192                 result.a = ( temp ) & 0xff;
 193         }
 194         else if ( !strcmp( color, "red" ) )
 195         {
 196                 result.r = 0xff;
 197                 result.g = 0x00;
 198                 result.b = 0x00;
 199         }
 200         else if ( !strcmp( color, "green" ) )
 201         {
 202                 result.r = 0x00;
 203                 result.g = 0xff;
 204                 result.b = 0x00;
 205         }
 206         else if ( !strcmp( color, "blue" ) )
 207         {
 208                 result.r = 0x00;
 209                 result.g = 0x00;
 210                 result.b = 0xff;
 211         }
 212         else
 213         {
 214                 unsigned int temp = 0;
 215                 sscanf( color, "%d", &temp );
 216                 result.r = ( temp >> 24 ) & 0xff;
 217                 result.g = ( temp >> 16 ) & 0xff;
 218                 result.b = ( temp >> 8 ) & 0xff;
 219                 result.a = ( temp ) & 0xff;
 220         }
 221
 222         return result;
 223 }
 224
 225 static void refresh_image( mlt_frame frame, int width, int height )
 226 {
 227         // Pixbuf
 228         GdkPixbuf *pixbuf = NULL;
 229
 230         // Obtain properties of frame
 231         mlt_properties properties = mlt_frame_properties( frame );
 232
 233         // Obtain the producer pango for this frame
 234         producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
 235
 236         // Obtain the producer
 237         mlt_producer producer = &this->parent;
 238
 239         // Obtain the producer properties
 240         mlt_properties producer_props = mlt_producer_properties( producer );
 241
 242         // Get producer properties
 243         char *fg = mlt_properties_get( producer_props, "fgcolour" );
 244         char *bg = mlt_properties_get( producer_props, "bgcolour" );
 245         int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
 246         int pad = mlt_properties_get_int( producer_props, "pad" );
 247         char *markup = mlt_properties_get( producer_props, "markup" );
 248         char *text = mlt_properties_get( producer_props, "text" );
 249         char *font = mlt_properties_get( producer_props, "font" );
 250
 251         // See if any properties changed
 252         int property_changed = ( align != this->align );
 253         property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
 254         property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
 255         property_changed = property_changed || ( pad != this->pad );
 256         property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
 257         property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
 258         property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
 259
 260         // Save the properties for next comparison
 261         this->align = align;
 262         this->pad = pad;
 263         set_string( &this->fgcolor, fg, "0xffffffff" );
 264         set_string( &this->bgcolor, bg, "0x00000000" );
 265         set_string( &this->markup, markup, NULL );
 266         set_string( &this->text, text, NULL );
 267         set_string( &this->font, font, "Sans 48" );
 268
 269         if ( property_changed )
 270         {
 271                 rgba_color fgcolor = parse_color( this->fgcolor );
 272                 rgba_color bgcolor = parse_color( this->bgcolor );
 273
 274                 mlt_pool_release( this->image );
 275                 mlt_pool_release( this->alpha );
 276                 this->image = NULL;
 277                 this->alpha = NULL;
 278
 279                 // Render the title
 280                 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
 281
 282                 if ( pixbuf != NULL )
 283                 {
 284                         // Register this pixbuf for destruction and reuse
 285                         mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
 286
 287                         mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
 288                         mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
 289
 290                         // Store the width/height of the pixbuf temporarily
 291                         this->width = gdk_pixbuf_get_width( pixbuf );
 292                         this->height = gdk_pixbuf_get_height( pixbuf );
 293                 }
 294         }
 295         else if ( width > 0 && ( this->image == NULL || width != this->width || height != this->height ) )
 296         {
 297                 mlt_pool_release( this->image );
 298                 mlt_pool_release( this->alpha );
 299                 this->image = NULL;
 300                 this->alpha = NULL;
 301
 302                 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
 303         }
 304
 305         // If we have a pixbuf and a valid width
 306         if ( pixbuf && width > 0 )
 307         {
 308                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 309                 int interp = GDK_INTERP_BILINEAR;
 310
 311                 if ( strcmp( interps, "nearest" ) == 0 )
 312                         interp = GDK_INTERP_NEAREST;
 313                 else if ( strcmp( interps, "tiles" ) == 0 )
 314                         interp = GDK_INTERP_TILES;
 315                 else if ( strcmp( interps, "hyper" ) == 0 )
 316                         interp = GDK_INTERP_HYPER;
 317
 318 //              fprintf( stderr, "SCALING PANGO from %dx%d to %dx%d was %dx%d\n", gdk_pixbuf_get_width( pixbuf ), gdk_pixbuf_get_height( pixbuf ), width, height, this->width, this->height );
 319
 320                 // Note - the original pixbuf is already safe and ready for destruction
 321                 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
 322
 323                 // Store width and height
 324                 this->width = width;
 325                 this->height = height;
 326
 327                 // Allocate/define image
 328                 this->image = mlt_pool_alloc( width * ( height + 1 ) * 2 );
 329                 this->alpha = mlt_pool_alloc( this->width * this->height );
 330
 331                 // Convert the image
 332                 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 333                                                                           this->width, this->height,
 334                                                                           gdk_pixbuf_get_rowstride( pixbuf ),
 335                                                                           this->image, this->alpha );
 336
 337                 // Finished with pixbuf now
 338                 g_object_unref( pixbuf );
 339         }
 340
 341         // Set width/height
 342         mlt_properties_set_int( properties, "width", this->width );
 343         mlt_properties_set_int( properties, "height", this->height );
 344         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
 345         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
 346
 347         // pass the image data without destructor
 348         mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * 2, NULL, NULL );
 349         mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
 350 }
 351
 352 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 353 {
 354         // Obtain properties of frame
 355         mlt_properties properties = mlt_frame_properties( frame );
 356
 357         *width = mlt_properties_get_int( properties, "rescale_width" );
 358         *height = mlt_properties_get_int( properties, "rescale_height" );
 359
 360         // Refresh the image
 361         refresh_image( frame, *width, *height );
 362
 363         // Determine format
 364         //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
 365         //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
 366
 367         // May need to know the size of the image to clone it
 368         int size = 0;
 369
 370         // Get the image
 371         uint8_t *image = mlt_properties_get_data( properties, "image", &size );
 372
 373         // Get width and height
 374         *width = mlt_properties_get_int( properties, "width" );
 375         *height = mlt_properties_get_int( properties, "height" );
 376
 377         // Clone if necessary
 378         if ( writable )
 379         {
 380                 // Clone our image
 381                 uint8_t *copy = mlt_pool_alloc( size );
 382                 memcpy( copy, image, size );
 383
 384                 // We're going to pass the copy on
 385                 image = copy;
 386
 387                 // Now update properties so we free the copy after
 388                 mlt_properties_set_data( properties, "image", copy, size, ( mlt_destructor )mlt_pool_release, NULL );
 389         }
 390
 391         // Pass on the image
 392         *buffer = image;
 393
 394         return 0;
 395 }
 396
 397 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 398 {
 399         // Obtain properties of frame
 400         mlt_properties properties = mlt_frame_properties( this );
 401
 402         // Return the alpha mask
 403         return mlt_properties_get_data( properties, "alpha", NULL );
 404 }
 405
 406 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 407 {
 408         producer_pango this = producer->child;
 409
 410         // Generate a frame
 411         *frame = mlt_frame_init( );
 412
 413         // Obtain properties of frame and producer
 414         mlt_properties properties = mlt_frame_properties( *frame );
 415
 416         // Set the producer on the frame properties
 417         mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
 418
 419         // Refresh the pango image
 420         refresh_image( *frame, 0, 0 );
 421
 422         // Set producer-specific frame properties
 423         mlt_properties_set_int( properties, "progressive", 1 );
 424         mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( properties, "real_width" ) / mlt_properties_get_double( properties, "real_height" ) );
 425
 426         // Set alpha call back
 427         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 428
 429         // Stack the get image callback
 430         mlt_frame_push_get_image( *frame, producer_get_image );
 431
 432         // Update timecode on the frame we're creating
 433         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 434
 435         // Calculate the next timecode
 436         mlt_producer_prepare_next( producer );
 437
 438         return 0;
 439 }
 440
 441 static void producer_close( mlt_producer parent )
 442 {
 443         producer_pango this = parent->child;
 444         mlt_pool_release( this->image );
 445         mlt_pool_release( this->alpha );
 446         free( this->fgcolor );
 447         free( this->bgcolor );
 448         free( this->markup );
 449         free( this->text );
 450         free( this->font );
 451         parent->close = NULL;
 452         mlt_producer_close( parent );
 453         free( this );
 454 }
 455
 456 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
 457 {
 458         int ww = gdk_pixbuf_get_width( pixbuf );
 459         int hh = gdk_pixbuf_get_height( pixbuf );
 460         uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
 461         int i, j;
 462
 463         for ( j = 0; j < hh; j++ )
 464         {
 465                 for ( i = 0; i < ww; i++ )
 466                 {
 467                         *p++ = bg.r;
 468                         *p++ = bg.g;
 469                         *p++ = bg.b;
 470                         *p++ = bg.a;
 471                 }
 472         }
 473 }
 474
 475 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align )
 476 {
 477         PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
 478         PangoContext *context = pango_ft2_font_map_create_context( fontmap );
 479         PangoLayout *layout = pango_layout_new( context );
 480         int w, h, x;
 481         int i, j;
 482         GdkPixbuf *pixbuf = NULL;
 483         FT_Bitmap bitmap;
 484         uint8_t *src = NULL;
 485         uint8_t* dest = NULL;
 486         int stride;
 487
 488         pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
 489         pango_layout_set_width( layout, -1 ); // set wrapping constraints
 490         pango_layout_set_font_description( layout, pango_font_description_from_string( font ) );
 491 //      pango_layout_set_spacing( layout, space );
 492         pango_layout_set_alignment( layout, ( PangoAlignment ) align  );
 493         if ( markup != NULL && strcmp( markup, "" ) != 0 )
 494                 pango_layout_set_markup( layout, markup, strlen( markup ) );
 495         else if ( text != NULL && strcmp( text, "" ) != 0 )
 496                 pango_layout_set_text( layout, text, strlen( text ) );
 497         else
 498                 return NULL;
 499         pango_layout_get_pixel_size( layout, &w, &h );
 500
 501         pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
 502         pango_draw_background( pixbuf, bg );
 503
 504         stride = gdk_pixbuf_get_rowstride( pixbuf );
 505
 506         bitmap.width     = w;
 507         bitmap.pitch     = 32 * ( ( w + 31 ) / 31 );
 508         bitmap.rows      = h;
 509         bitmap.buffer    = mlt_pool_alloc( h * bitmap.pitch );
 510         bitmap.num_grays = 256;
 511         bitmap.pixel_mode = ft_pixel_mode_grays;
 512
 513         memset( bitmap.buffer, 0, h * bitmap.pitch );
 514
 515         pango_ft2_render_layout( &bitmap, layout, 0, 0 );
 516
 517         src = bitmap.buffer;
 518         x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
 519         dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
 520         for ( j = 0; j < h; j++ )
 521         {
 522                 uint8_t *d = dest;
 523                 for ( i = 0; i < w; i++ )
 524                 {
 525                         float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
 526                         *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
 527                         *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
 528                         *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
 529                         *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
 530                 }
 531                 dest += stride;
 532         }
 533         mlt_pool_release( bitmap.buffer );
 534         g_object_unref( layout );
 535         g_object_unref( context );
 536         g_object_unref( fontmap );
 537
 538         return pixbuf;
 539 }
 540