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         void *image_release;
  35         uint8_t *image;
  36         void *alpha_release;
  37         uint8_t *alpha;
  38         char *fgcolor;
  39         char *bgcolor;
  40         int   align;
  41         int   pad;
  42         char *markup;
  43         char *text;
  44         char *font;
  45 };
  46
  47 // special color type used by internal pango routines
  48 typedef struct
  49 {
  50         uint8_t r, g, b, a;
  51 } rgba_color;
  52
  53 // Forward declarations
  54 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  55 static void producer_close( mlt_producer parent );
  56 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
  57 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font,
  58         rgba_color fg, rgba_color bg, int pad, int align );
  59
  60 /** Parse the alignment property.
  61 */
  62
  63 static int alignment_parse( char* align )
  64 {
  65         int ret = pango_align_left;
  66
  67         if ( align == NULL );
  68         else if ( isdigit( align[ 0 ] ) )
  69                 ret = atoi( align );
  70         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  71                 ret = pango_align_center;
  72         else if ( align[ 0 ] == 'r' )
  73                 ret = pango_align_right;
  74
  75         return ret;
  76 }
  77
  78 mlt_producer producer_pango_init( const char *filename )
  79 {
  80         producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
  81         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  82         {
  83                 mlt_producer producer = &this->parent;
  84
  85                 producer->get_frame = producer_get_frame;
  86                 producer->close = producer_close;
  87
  88                 // This is required to initialise gdk-pixbuf
  89                 g_type_init();
  90
  91                 // Get the properties interface
  92                 mlt_properties properties = mlt_producer_properties( &this->parent );
  93
  94                 // Set the default properties
  95                 mlt_properties_set( properties, "fgcolour", "0xffffffff" );
  96                 mlt_properties_set( properties, "bgcolour", "0x00000000" );
  97                 mlt_properties_set_int( properties, "align", pango_align_left );
  98                 mlt_properties_set_int( properties, "pad", 0 );
  99                 mlt_properties_set( properties, "text", "" );
 100                 mlt_properties_set( properties, "font", "Sans 48" );
 101
 102                 if ( filename == NULL )
 103                 {
 104                         mlt_properties_set( properties, "resource", "pango" );
 105                         mlt_properties_set( properties, "markup", "" );
 106                 }
 107                 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
 108                 {
 109                         char *copy = strdup( filename + 1 );
 110                         char *markup = copy;
 111                         if ( strstr( markup, "/+" ) )
 112                                 markup = strstr( markup, "/+" ) + 2;
 113                         ( *strrchr( markup, '.' ) ) = '\0';
 114                         while ( strchr( markup, '~' ) )
 115                                 ( *strchr( markup, '~' ) ) = '\n';
 116                         mlt_properties_set( properties, "resource", ( char * )filename );
 117                         mlt_properties_set( properties, "markup", markup );
 118                         free( copy );
 119                 }
 120                 else
 121                 {
 122                         FILE *f = fopen( filename, "r" );
 123                         if ( f != NULL )
 124                         {
 125                                 char line[81];
 126                                 char *markup = NULL;
 127                                 size_t size = 0;
 128                                 line[80] = '\0';
 129
 130                                 while ( fgets( line, 80, f ) )
 131                                 {
 132                                         size += strlen( line ) + 1;
 133                                         if ( markup )
 134                                         {
 135                                                 markup = realloc( markup, size );
 136                                                 strcat( markup, line );
 137                                         }
 138                                         else
 139                                         {
 140                                                 markup = strdup( line );
 141                                         }
 142                                 }
 143                                 fclose( f );
 144
 145                                 if ( markup[ strlen( markup ) - 1 ] == '\n' )
 146                                         markup[ strlen( markup ) - 1 ] = '\0';
 147
 148                                 mlt_properties_set( properties, "resource", ( char * ) filename );
 149                                 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
 150                                 free( markup );
 151                         }
 152                         else
 153                         {
 154                                 mlt_properties_set( properties, "resource", "pango" );
 155                                 mlt_properties_set( properties, "markup", "" );
 156                         }
 157                 }
 158
 159                 return producer;
 160         }
 161         free( this );
 162         return NULL;
 163 }
 164
 165 static void set_string( char **string, char *value, char *fallback )
 166 {
 167         if ( value != NULL )
 168         {
 169                 free( *string );
 170                 *string = strdup( value );
 171         }
 172         else if ( *string == NULL && fallback != NULL )
 173         {
 174                 *string = strdup( fallback );
 175         }
 176         else if ( *string != NULL && fallback == NULL )
 177         {
 178                 free( *string );
 179                 *string = NULL;
 180         }
 181 }
 182
 183 rgba_color parse_color( char *color )
 184 {
 185         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
 186
 187         if ( !strncmp( color, "0x", 2 ) )
 188         {
 189                 unsigned int temp = 0;
 190                 sscanf( color + 2, "%x", &temp );
 191                 result.r = ( temp >> 24 ) & 0xff;
 192                 result.g = ( temp >> 16 ) & 0xff;
 193                 result.b = ( temp >> 8 ) & 0xff;
 194                 result.a = ( temp ) & 0xff;
 195         }
 196         else if ( !strcmp( color, "red" ) )
 197         {
 198                 result.r = 0xff;
 199                 result.g = 0x00;
 200                 result.b = 0x00;
 201         }
 202         else if ( !strcmp( color, "green" ) )
 203         {
 204                 result.r = 0x00;
 205                 result.g = 0xff;
 206                 result.b = 0x00;
 207         }
 208         else if ( !strcmp( color, "blue" ) )
 209         {
 210                 result.r = 0x00;
 211                 result.g = 0x00;
 212                 result.b = 0xff;
 213         }
 214         else
 215         {
 216                 unsigned int temp = 0;
 217                 sscanf( color, "%d", &temp );
 218                 result.r = ( temp >> 24 ) & 0xff;
 219                 result.g = ( temp >> 16 ) & 0xff;
 220                 result.b = ( temp >> 8 ) & 0xff;
 221                 result.a = ( temp ) & 0xff;
 222         }
 223
 224         return result;
 225 }
 226
 227 static void refresh_image( mlt_frame frame, int width, int height )
 228 {
 229         // Pixbuf
 230         GdkPixbuf *pixbuf = NULL;
 231
 232         // Obtain properties of frame
 233         mlt_properties properties = mlt_frame_properties( frame );
 234
 235         // Obtain the producer pango for this frame
 236         producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
 237
 238         // Obtain the producer
 239         mlt_producer producer = &this->parent;
 240
 241         // Obtain the producer properties
 242         mlt_properties producer_props = mlt_producer_properties( producer );
 243
 244         // Get producer properties
 245         char *fg = mlt_properties_get( producer_props, "fgcolour" );
 246         char *bg = mlt_properties_get( producer_props, "bgcolour" );
 247         int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
 248         int pad = mlt_properties_get_int( producer_props, "pad" );
 249         char *markup = mlt_properties_get( producer_props, "markup" );
 250         char *text = mlt_properties_get( producer_props, "text" );
 251         char *font = mlt_properties_get( producer_props, "font" );
 252
 253         // See if any properties changed
 254         int property_changed = ( align != this->align );
 255         property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
 256         property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
 257         property_changed = property_changed || ( pad != this->pad );
 258         property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
 259         property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
 260         property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
 261
 262         // Save the properties for next comparison
 263         this->align = align;
 264         this->pad = pad;
 265         set_string( &this->fgcolor, fg, "0xffffffff" );
 266         set_string( &this->bgcolor, bg, "0x00000000" );
 267         set_string( &this->markup, markup, NULL );
 268         set_string( &this->text, text, NULL );
 269         set_string( &this->font, font, "Sans 48" );
 270
 271         if ( property_changed )
 272         {
 273                 rgba_color fgcolor = parse_color( this->fgcolor );
 274                 rgba_color bgcolor = parse_color( this->bgcolor );
 275
 276                 mlt_pool_release( this->image_release );
 277                 mlt_pool_release( this->alpha_release );
 278                 this->image_release = NULL;
 279                 this->alpha_release = NULL;
 280                 this->image = NULL;
 281                 this->alpha = NULL;
 282
 283                 // Render the title
 284                 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
 285
 286                 if ( pixbuf != NULL )
 287                 {
 288                         // Register this pixbuf for destruction and reuse
 289                         mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
 290
 291                         mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
 292                         mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
 293
 294                         // Store the width/height of the pixbuf temporarily
 295                         this->width = gdk_pixbuf_get_width( pixbuf );
 296                         this->height = gdk_pixbuf_get_height( pixbuf );
 297                 }
 298         }
 299         else if ( width > 0 && ( this->image == NULL || width != this->width || height != this->height ) )
 300         {
 301                 mlt_pool_release( this->image_release );
 302                 mlt_pool_release( this->alpha_release );
 303                 this->image_release = NULL;
 304                 this->alpha_release = NULL;
 305                 this->image = NULL;
 306                 this->alpha = NULL;
 307
 308                 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
 309         }
 310
 311         // If we have a pixbuf and a valid width
 312         if ( pixbuf && width > 0 )
 313         {
 314                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 315                 int interp = GDK_INTERP_BILINEAR;
 316
 317                 if ( strcmp( interps, "nearest" ) == 0 )
 318                         interp = GDK_INTERP_NEAREST;
 319                 else if ( strcmp( interps, "tiles" ) == 0 )
 320                         interp = GDK_INTERP_TILES;
 321                 else if ( strcmp( interps, "hyper" ) == 0 )
 322                         interp = GDK_INTERP_HYPER;
 323
 324 //              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 );
 325
 326                 // Note - the original pixbuf is already safe and ready for destruction
 327                 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
 328
 329                 // Store width and height
 330                 this->width = width;
 331                 this->height = height;
 332
 333                 // Allocate/define image
 334                 this->image = mlt_pool_allocate( width * ( height + 1 ) * 2, &this->image_release );
 335                 this->alpha = mlt_pool_allocate( this->width * this->height, &this->alpha_release );
 336
 337                 // Convert the image
 338                 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 339                                                                           this->width, this->height,
 340                                                                           gdk_pixbuf_get_rowstride( pixbuf ),
 341                                                                           this->image, this->alpha );
 342
 343                 // Finished with pixbuf now
 344                 g_object_unref( pixbuf );
 345         }
 346
 347         // Set width/height
 348         mlt_properties_set_int( properties, "width", this->width );
 349         mlt_properties_set_int( properties, "height", this->height );
 350         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
 351         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
 352
 353         // pass the image data without destructor
 354         mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * 2, NULL, NULL );
 355         mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
 356 }
 357
 358 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 359 {
 360         // Obtain properties of frame
 361         mlt_properties properties = mlt_frame_properties( frame );
 362
 363         *width = mlt_properties_get_int( properties, "rescale_width" );
 364         *height = mlt_properties_get_int( properties, "rescale_height" );
 365
 366         // Refresh the image
 367         refresh_image( frame, *width, *height );
 368
 369         // Determine format
 370         //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
 371         //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
 372
 373         // May need to know the size of the image to clone it
 374         int size = 0;
 375
 376         // Get the image
 377         uint8_t *image = mlt_properties_get_data( properties, "image", &size );
 378
 379         // Get width and height
 380         *width = mlt_properties_get_int( properties, "width" );
 381         *height = mlt_properties_get_int( properties, "height" );
 382
 383         // Clone if necessary
 384         if ( writable )
 385         {
 386                 // Clone our image
 387                 void *release = NULL;
 388                 uint8_t *copy = mlt_pool_allocate( size, &release );
 389                 memcpy( copy, image, size );
 390
 391                 // We're going to pass the copy on
 392                 image = copy;
 393
 394                 // Now update properties so we free the copy after
 395                 mlt_properties_set_data( properties, "image_release", release, 0, ( mlt_destructor )mlt_pool_release, NULL );
 396                 mlt_properties_set_data( properties, "image", copy, size, NULL, NULL );
 397         }
 398
 399         // Pass on the image
 400         *buffer = image;
 401
 402         return 0;
 403 }
 404
 405 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 406 {
 407         // Obtain properties of frame
 408         mlt_properties properties = mlt_frame_properties( this );
 409
 410         // Return the alpha mask
 411         return mlt_properties_get_data( properties, "alpha", NULL );
 412 }
 413
 414 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 415 {
 416         producer_pango this = producer->child;
 417
 418         // Generate a frame
 419         *frame = mlt_frame_init( );
 420
 421         // Obtain properties of frame and producer
 422         mlt_properties properties = mlt_frame_properties( *frame );
 423
 424         // Set the producer on the frame properties
 425         mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
 426
 427         // Refresh the pango image
 428         refresh_image( *frame, 0, 0 );
 429
 430         // Set producer-specific frame properties
 431         mlt_properties_set_int( properties, "progressive", 1 );
 432         mlt_properties_set_double( properties, "aspect_ratio", mlt_properties_get_double( properties, "real_width" ) / mlt_properties_get_double( properties, "real_height" ) );
 433
 434         // Set alpha call back
 435         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 436
 437         // Stack the get image callback
 438         mlt_frame_push_get_image( *frame, producer_get_image );
 439
 440         // Update timecode on the frame we're creating
 441         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 442
 443         // Calculate the next timecode
 444         mlt_producer_prepare_next( producer );
 445
 446         return 0;
 447 }
 448
 449 static void producer_close( mlt_producer parent )
 450 {
 451         producer_pango this = parent->child;
 452         mlt_pool_release( this->image_release );
 453         mlt_pool_release( this->alpha_release );
 454         free( this->fgcolor );
 455         free( this->bgcolor );
 456         free( this->markup );
 457         free( this->text );
 458         free( this->font );
 459         parent->close = NULL;
 460         mlt_producer_close( parent );
 461         free( this );
 462 }
 463
 464 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
 465 {
 466         int ww = gdk_pixbuf_get_width( pixbuf );
 467         int hh = gdk_pixbuf_get_height( pixbuf );
 468         uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
 469         int i, j;
 470
 471         for ( j = 0; j < hh; j++ )
 472         {
 473                 for ( i = 0; i < ww; i++ )
 474                 {
 475                         *p++ = bg.r;
 476                         *p++ = bg.g;
 477                         *p++ = bg.b;
 478                         *p++ = bg.a;
 479                 }
 480         }
 481 }
 482
 483 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align )
 484 {
 485         PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
 486         PangoContext *context = pango_ft2_font_map_create_context( fontmap );
 487         PangoLayout *layout = pango_layout_new( context );
 488         int w, h, x;
 489         int i, j;
 490         GdkPixbuf *pixbuf = NULL;
 491         FT_Bitmap bitmap;
 492         uint8_t *src = NULL;
 493         uint8_t* dest = NULL;
 494         int stride;
 495         void *release = NULL;
 496
 497         pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
 498         pango_layout_set_width( layout, -1 ); // set wrapping constraints
 499         pango_layout_set_font_description( layout, pango_font_description_from_string( font ) );
 500 //      pango_layout_set_spacing( layout, space );
 501         pango_layout_set_alignment( layout, ( PangoAlignment ) align  );
 502         if ( markup != NULL && strcmp( markup, "" ) != 0 )
 503                 pango_layout_set_markup( layout, markup, strlen( markup ) );
 504         else if ( text != NULL && strcmp( text, "" ) != 0 )
 505                 pango_layout_set_text( layout, text, strlen( text ) );
 506         else
 507                 return NULL;
 508         pango_layout_get_pixel_size( layout, &w, &h );
 509
 510         pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
 511         pango_draw_background( pixbuf, bg );
 512
 513         stride = gdk_pixbuf_get_rowstride( pixbuf );
 514
 515         bitmap.width     = w;
 516         bitmap.pitch     = 32 * ( ( w + 31 ) / 31 );
 517         bitmap.rows      = h;
 518         bitmap.buffer    = mlt_pool_allocate( h * bitmap.pitch, &release );
 519         bitmap.num_grays = 256;
 520         bitmap.pixel_mode = ft_pixel_mode_grays;
 521
 522         memset( bitmap.buffer, 0, h * bitmap.pitch );
 523
 524         pango_ft2_render_layout( &bitmap, layout, 0, 0 );
 525
 526         src = bitmap.buffer;
 527         x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
 528         dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
 529         for ( j = 0; j < h; j++ )
 530         {
 531                 uint8_t *d = dest;
 532                 for ( i = 0; i < w; i++ )
 533                 {
 534                         float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
 535                         *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
 536                         *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
 537                         *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
 538                         *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
 539                 }
 540                 dest += stride;
 541         }
 542         mlt_pool_release( release );
 543         g_object_unref( layout );
 544         g_object_unref( context );
 545         g_object_unref( fontmap );
 546
 547         return pixbuf;
 548 }
 549