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 #include <iconv.h>
  29
  30 struct producer_pango_s
  31 {
  32         struct mlt_producer_s parent;
  33         int width;
  34         int height;
  35         uint8_t *image;
  36         uint8_t *alpha;
  37         char *fgcolor;
  38         char *bgcolor;
  39         int   align;
  40         int   pad;
  41         char *markup;
  42         char *text;
  43         char *font;
  44 };
  45
  46 // special color type used by internal pango routines
  47 typedef struct
  48 {
  49         uint8_t r, g, b, a;
  50 } rgba_color;
  51
  52 // Forward declarations
  53 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  54 static void producer_close( mlt_producer parent );
  55 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg );
  56 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font,
  57         rgba_color fg, rgba_color bg, int pad, int align );
  58
  59 /** Return nonzero if the two strings are equal, ignoring case, up to
  60     the first n characters.
  61 */
  62 int strncaseeq(const char *s1, const char *s2, size_t n)
  63 {
  64         for ( ; n > 0; n--)
  65         {
  66                 if (tolower(*s1++) != tolower(*s2++))
  67                         return 0;
  68         }
  69         return 1;
  70 }
  71
  72 /** Parse the alignment property.
  73 */
  74
  75 static int alignment_parse( char* align )
  76 {
  77         int ret = pango_align_left;
  78
  79         if ( align == NULL );
  80         else if ( isdigit( align[ 0 ] ) )
  81                 ret = atoi( align );
  82         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  83                 ret = pango_align_center;
  84         else if ( align[ 0 ] == 'r' )
  85                 ret = pango_align_right;
  86
  87         return ret;
  88 }
  89
  90 mlt_producer producer_pango_init( const char *filename )
  91 {
  92         producer_pango this = calloc( sizeof( struct producer_pango_s ), 1 );
  93         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  94         {
  95                 mlt_producer producer = &this->parent;
  96
  97                 producer->get_frame = producer_get_frame;
  98                 producer->close = ( mlt_destructor )producer_close;
  99
 100                 // This is required to initialise gdk-pixbuf
 101                 g_type_init();
 102
 103                 // Get the properties interface
 104                 mlt_properties properties = mlt_producer_properties( &this->parent );
 105
 106                 // Set the default properties
 107                 mlt_properties_set( properties, "fgcolour", "0xffffffff" );
 108                 mlt_properties_set( properties, "bgcolour", "0x00000000" );
 109                 mlt_properties_set_int( properties, "align", pango_align_left );
 110                 mlt_properties_set_int( properties, "pad", 0 );
 111                 mlt_properties_set( properties, "text", "" );
 112                 mlt_properties_set( properties, "font", "Sans 48" );
 113                 mlt_properties_set( properties, "encoding", "UTF-8" );
 114
 115                 if ( filename == NULL )
 116                 {
 117                         mlt_properties_set( properties, "markup", "" );
 118                 }
 119                 else if ( filename[ 0 ] == '+' || strstr( filename, "/+" ) )
 120                 {
 121                         char *copy = strdup( filename + 1 );
 122                         char *markup = copy;
 123                         if ( strstr( markup, "/+" ) )
 124                                 markup = strstr( markup, "/+" ) + 2;
 125                         ( *strrchr( markup, '.' ) ) = '\0';
 126                         while ( strchr( markup, '~' ) )
 127                                 ( *strchr( markup, '~' ) ) = '\n';
 128                         mlt_properties_set( properties, "resource", ( char * )filename );
 129                         mlt_properties_set( properties, "markup", markup );
 130                         free( copy );
 131                 }
 132                 else
 133                 {
 134                         FILE *f = fopen( filename, "r" );
 135                         if ( f != NULL )
 136                         {
 137                                 char line[81];
 138                                 char *markup = NULL;
 139                                 size_t size = 0;
 140                                 line[80] = '\0';
 141
 142                                 while ( fgets( line, 80, f ) )
 143                                 {
 144                                         size += strlen( line ) + 1;
 145                                         if ( markup )
 146                                         {
 147                                                 markup = realloc( markup, size );
 148                                                 strcat( markup, line );
 149                                         }
 150                                         else
 151                                         {
 152                                                 markup = strdup( line );
 153                                         }
 154                                 }
 155                                 fclose( f );
 156
 157                                 if ( markup[ strlen( markup ) - 1 ] == '\n' )
 158                                         markup[ strlen( markup ) - 1 ] = '\0';
 159
 160                                 mlt_properties_set( properties, "resource", ( char * ) filename );
 161                                 mlt_properties_set( properties, "markup", ( char * ) ( markup == NULL ? "" : markup ) );
 162                                 free( markup );
 163                         }
 164                         else
 165                         {
 166                                 mlt_properties_set( properties, "markup", "" );
 167                         }
 168                 }
 169
 170                 return producer;
 171         }
 172         free( this );
 173         return NULL;
 174 }
 175
 176 static void set_string( char **string, char *value, char *fallback )
 177 {
 178         if ( value != NULL )
 179         {
 180                 free( *string );
 181                 *string = strdup( value );
 182         }
 183         else if ( *string == NULL && fallback != NULL )
 184         {
 185                 *string = strdup( fallback );
 186         }
 187         else if ( *string != NULL && fallback == NULL )
 188         {
 189                 free( *string );
 190                 *string = NULL;
 191         }
 192 }
 193
 194 rgba_color parse_color( char *color )
 195 {
 196         rgba_color result = { 0xff, 0xff, 0xff, 0xff };
 197
 198         if ( !strncmp( color, "0x", 2 ) )
 199         {
 200                 unsigned int temp = 0;
 201                 sscanf( color + 2, "%x", &temp );
 202                 result.r = ( temp >> 24 ) & 0xff;
 203                 result.g = ( temp >> 16 ) & 0xff;
 204                 result.b = ( temp >> 8 ) & 0xff;
 205                 result.a = ( temp ) & 0xff;
 206         }
 207         else if ( !strcmp( color, "red" ) )
 208         {
 209                 result.r = 0xff;
 210                 result.g = 0x00;
 211                 result.b = 0x00;
 212         }
 213         else if ( !strcmp( color, "green" ) )
 214         {
 215                 result.r = 0x00;
 216                 result.g = 0xff;
 217                 result.b = 0x00;
 218         }
 219         else if ( !strcmp( color, "blue" ) )
 220         {
 221                 result.r = 0x00;
 222                 result.g = 0x00;
 223                 result.b = 0xff;
 224         }
 225         else
 226         {
 227                 unsigned int temp = 0;
 228                 sscanf( color, "%d", &temp );
 229                 result.r = ( temp >> 24 ) & 0xff;
 230                 result.g = ( temp >> 16 ) & 0xff;
 231                 result.b = ( temp >> 8 ) & 0xff;
 232                 result.a = ( temp ) & 0xff;
 233         }
 234
 235         return result;
 236 }
 237
 238 /** Convert a string property to UTF-8
 239 */
 240 static int iconv_utf8( mlt_properties properties, char *prop_name, const char* encoding )
 241 {
 242         char *text = mlt_properties_get( properties, prop_name );
 243         int result = -1;
 244
 245         iconv_t cd = iconv_open( "UTF-8", encoding );
 246         if ( cd != ( iconv_t )-1 )
 247         {
 248                 char *inbuf_p = strdup( text );
 249                 size_t inbuf_n = strlen( text );
 250                 size_t outbuf_n = inbuf_n * 6;
 251                 char *outbuf = mlt_pool_alloc( outbuf_n );
 252                 char *outbuf_p = outbuf;
 253
 254                 if ( iconv( cd, &inbuf_p, &inbuf_n, &outbuf_p, &outbuf_n ) != -1 )
 255                 {
 256                         outbuf[ outbuf_n ] = 0;
 257                         mlt_properties_set( properties, prop_name, outbuf );
 258                         result = 0;
 259                 }
 260                 mlt_pool_release( outbuf );
 261                 iconv_close( cd );
 262         }
 263         return result;
 264 }
 265
 266 static void refresh_image( mlt_frame frame, int width, int height )
 267 {
 268         // Pixbuf
 269         GdkPixbuf *pixbuf = NULL;
 270
 271         // Obtain properties of frame
 272         mlt_properties properties = mlt_frame_properties( frame );
 273
 274         // Obtain the producer pango for this frame
 275         producer_pango this = mlt_properties_get_data( properties, "producer_pango", NULL );
 276
 277         // Obtain the producer
 278         mlt_producer producer = &this->parent;
 279
 280         // Obtain the producer properties
 281         mlt_properties producer_props = mlt_producer_properties( producer );
 282
 283         // Get producer properties
 284         char *fg = mlt_properties_get( producer_props, "fgcolour" );
 285         char *bg = mlt_properties_get( producer_props, "bgcolour" );
 286         int align = alignment_parse( mlt_properties_get( producer_props, "align" ) );
 287         int pad = mlt_properties_get_int( producer_props, "pad" );
 288         char *markup = mlt_properties_get( producer_props, "markup" );
 289         char *text = mlt_properties_get( producer_props, "text" );
 290         char *font = mlt_properties_get( producer_props, "font" );
 291         char *encoding = mlt_properties_get( producer_props, "encoding" );
 292
 293         // See if any properties changed
 294         int property_changed = ( align != this->align );
 295         property_changed = property_changed || ( this->fgcolor == NULL || ( fg && strcmp( fg, this->fgcolor ) ) );
 296         property_changed = property_changed || ( this->bgcolor == NULL || ( bg && strcmp( bg, this->bgcolor ) ) );
 297         property_changed = property_changed || ( pad != this->pad );
 298         property_changed = property_changed || ( markup && this->markup && strcmp( markup, this->markup ) );
 299         property_changed = property_changed || ( text && this->text && strcmp( text, this->text ) );
 300         property_changed = property_changed || ( font && this->font && strcmp( font, this->font ) );
 301
 302         // Save the properties for next comparison
 303         this->align = align;
 304         this->pad = pad;
 305         set_string( &this->fgcolor, fg, "0xffffffff" );
 306         set_string( &this->bgcolor, bg, "0x00000000" );
 307         set_string( &this->markup, markup, NULL );
 308         set_string( &this->text, text, NULL );
 309         set_string( &this->font, font, "Sans 48" );
 310
 311         if ( property_changed )
 312         {
 313                 rgba_color fgcolor = parse_color( this->fgcolor );
 314                 rgba_color bgcolor = parse_color( this->bgcolor );
 315
 316                 mlt_pool_release( this->image );
 317                 mlt_pool_release( this->alpha );
 318                 this->image = NULL;
 319                 this->alpha = NULL;
 320
 321                 // Convert from specified encoding to UTF-8
 322                 if ( encoding != NULL && !strncaseeq( encoding, "utf-8", 5 ) && !strncaseeq( encoding, "utf8", 4 ) )
 323                 {
 324                         if ( markup != NULL && iconv_utf8( producer_props, "markup", encoding ) != -1 )
 325                         {
 326                                 markup = mlt_properties_get( producer_props, "markup" );
 327                                 set_string( &this->markup, markup, NULL );
 328                         }
 329                         if ( text != NULL && iconv_utf8( producer_props, "text", encoding ) != -1 )
 330                         {
 331                                 text = mlt_properties_get( producer_props, "text" );
 332                                 set_string( &this->text, text, NULL );
 333                         }
 334                 }
 335
 336                 // Render the title
 337                 pixbuf = pango_get_pixbuf( markup, text, font, fgcolor, bgcolor, pad, align );
 338
 339                 if ( pixbuf != NULL )
 340                 {
 341                         // Register this pixbuf for destruction and reuse
 342                         mlt_properties_set_data( producer_props, "pixbuf", pixbuf, 0, ( mlt_destructor )g_object_unref, NULL );
 343
 344                         mlt_properties_set_int( producer_props, "real_width", gdk_pixbuf_get_width( pixbuf ) );
 345                         mlt_properties_set_int( producer_props, "real_height", gdk_pixbuf_get_height( pixbuf ) );
 346
 347                         // Store the width/height of the pixbuf temporarily
 348                         this->width = gdk_pixbuf_get_width( pixbuf );
 349                         this->height = gdk_pixbuf_get_height( pixbuf );
 350                 }
 351         }
 352         else if ( width > 0 && ( this->image == NULL || width != this->width || height != this->height ) )
 353         {
 354                 mlt_pool_release( this->image );
 355                 mlt_pool_release( this->alpha );
 356                 this->image = NULL;
 357                 this->alpha = NULL;
 358
 359                 pixbuf = mlt_properties_get_data( producer_props, "pixbuf", NULL );
 360         }
 361
 362         // If we have a pixbuf and a valid width
 363         if ( pixbuf && width > 0 )
 364         {
 365                 char *interps = mlt_properties_get( properties, "rescale.interp" );
 366                 int interp = GDK_INTERP_BILINEAR;
 367
 368                 if ( strcmp( interps, "nearest" ) == 0 )
 369                         interp = GDK_INTERP_NEAREST;
 370                 else if ( strcmp( interps, "tiles" ) == 0 )
 371                         interp = GDK_INTERP_TILES;
 372                 else if ( strcmp( interps, "hyper" ) == 0 )
 373                         interp = GDK_INTERP_HYPER;
 374
 375 //              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 );
 376
 377                 // Note - the original pixbuf is already safe and ready for destruction
 378                 pixbuf = gdk_pixbuf_scale_simple( pixbuf, width, height, interp );
 379
 380                 // Store width and height
 381                 this->width = width;
 382                 this->height = height;
 383
 384                 // Allocate/define image
 385                 this->image = mlt_pool_alloc( width * ( height + 1 ) * 2 );
 386                 this->alpha = mlt_pool_alloc( this->width * this->height );
 387
 388                 // Convert the image
 389                 mlt_convert_rgb24a_to_yuv422( gdk_pixbuf_get_pixels( pixbuf ),
 390                                                                           this->width, this->height,
 391                                                                           gdk_pixbuf_get_rowstride( pixbuf ),
 392                                                                           this->image, this->alpha );
 393
 394                 // Finished with pixbuf now
 395                 g_object_unref( pixbuf );
 396         }
 397
 398         // Set width/height
 399         mlt_properties_set_int( properties, "width", this->width );
 400         mlt_properties_set_int( properties, "height", this->height );
 401         mlt_properties_set_int( properties, "real_width", mlt_properties_get_int( producer_props, "real_width" ) );
 402         mlt_properties_set_int( properties, "real_height", mlt_properties_get_int( producer_props, "real_height" ) );
 403
 404         // pass the image data without destructor
 405         mlt_properties_set_data( properties, "image", this->image, this->width * ( this->height + 1 ) * 2, NULL, NULL );
 406         mlt_properties_set_data( properties, "alpha", this->alpha, this->width * this->height, NULL, NULL );
 407 }
 408
 409 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 410 {
 411         // Obtain properties of frame
 412         mlt_properties properties = mlt_frame_properties( frame );
 413
 414         *width = mlt_properties_get_int( properties, "rescale_width" );
 415         *height = mlt_properties_get_int( properties, "rescale_height" );
 416
 417         // Refresh the image
 418         refresh_image( frame, *width, *height );
 419
 420         // Determine format
 421         //mlt_producer this = mlt_properties_get_data( properties, "producer_pango", NULL );
 422         //*format = ( mlt_properties_get_int( mlt_producer_properties( this ), "bpp" ) == 4 ) ? mlt_image_rgb24a : mlt_image_rgb24;
 423
 424         // May need to know the size of the image to clone it
 425         int size = 0;
 426
 427         // Get the image
 428         uint8_t *image = mlt_properties_get_data( properties, "image", &size );
 429
 430         // Get width and height
 431         *width = mlt_properties_get_int( properties, "width" );
 432         *height = mlt_properties_get_int( properties, "height" );
 433
 434         // Clone if necessary
 435         if ( writable )
 436         {
 437                 // Clone our image
 438                 uint8_t *copy = mlt_pool_alloc( size );
 439                 memcpy( copy, image, size );
 440
 441                 // We're going to pass the copy on
 442                 image = copy;
 443
 444                 // Now update properties so we free the copy after
 445                 mlt_properties_set_data( properties, "image", copy, size, ( mlt_destructor )mlt_pool_release, NULL );
 446         }
 447
 448         // Pass on the image
 449         *buffer = image;
 450
 451         return 0;
 452 }
 453
 454 static uint8_t *producer_get_alpha_mask( mlt_frame this )
 455 {
 456         // Obtain properties of frame
 457         mlt_properties properties = mlt_frame_properties( this );
 458
 459         // Return the alpha mask
 460         return mlt_properties_get_data( properties, "alpha", NULL );
 461 }
 462
 463 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 464 {
 465         producer_pango this = producer->child;
 466
 467         // Generate a frame
 468         *frame = mlt_frame_init( );
 469
 470         // Obtain properties of frame and producer
 471         mlt_properties properties = mlt_frame_properties( *frame );
 472
 473         // Set the producer on the frame properties
 474         mlt_properties_set_data( properties, "producer_pango", this, 0, NULL, NULL );
 475
 476         // Refresh the pango image
 477         refresh_image( *frame, 0, 0 );
 478
 479         // Set producer-specific frame properties
 480         mlt_properties_set_int( properties, "progressive", 1 );
 481         mlt_properties_set_double( properties, "aspect_ratio", 1 );
 482
 483         // Set alpha call back
 484         ( *frame )->get_alpha_mask = producer_get_alpha_mask;
 485
 486         // Stack the get image callback
 487         mlt_frame_push_get_image( *frame, producer_get_image );
 488
 489         // Update timecode on the frame we're creating
 490         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 491
 492         // Calculate the next timecode
 493         mlt_producer_prepare_next( producer );
 494
 495         return 0;
 496 }
 497
 498 static void producer_close( mlt_producer parent )
 499 {
 500         producer_pango this = parent->child;
 501         mlt_pool_release( this->image );
 502         mlt_pool_release( this->alpha );
 503         free( this->fgcolor );
 504         free( this->bgcolor );
 505         free( this->markup );
 506         free( this->text );
 507         free( this->font );
 508         parent->close = NULL;
 509         mlt_producer_close( parent );
 510         free( this );
 511 }
 512
 513 static void pango_draw_background( GdkPixbuf *pixbuf, rgba_color bg )
 514 {
 515         int ww = gdk_pixbuf_get_width( pixbuf );
 516         int hh = gdk_pixbuf_get_height( pixbuf );
 517         uint8_t *p = gdk_pixbuf_get_pixels( pixbuf );
 518         int i, j;
 519
 520         for ( j = 0; j < hh; j++ )
 521         {
 522                 for ( i = 0; i < ww; i++ )
 523                 {
 524                         *p++ = bg.r;
 525                         *p++ = bg.g;
 526                         *p++ = bg.b;
 527                         *p++ = bg.a;
 528                 }
 529         }
 530 }
 531
 532 static GdkPixbuf *pango_get_pixbuf( const char *markup, const char *text, const char *font, rgba_color fg, rgba_color bg, int pad, int align )
 533 {
 534         PangoFT2FontMap *fontmap = (PangoFT2FontMap*) pango_ft2_font_map_new();
 535         PangoContext *context = pango_ft2_font_map_create_context( fontmap );
 536         PangoLayout *layout = pango_layout_new( context );
 537         int w, h, x;
 538         int i, j;
 539         GdkPixbuf *pixbuf = NULL;
 540         FT_Bitmap bitmap;
 541         uint8_t *src = NULL;
 542         uint8_t* dest = NULL;
 543         int stride;
 544
 545         pango_ft2_font_map_set_resolution( fontmap, 72, 72 );
 546         pango_layout_set_width( layout, -1 ); // set wrapping constraints
 547         pango_layout_set_font_description( layout, pango_font_description_from_string( font ) );
 548 //      pango_layout_set_spacing( layout, space );
 549         pango_layout_set_alignment( layout, ( PangoAlignment ) align  );
 550         if ( markup != NULL && strcmp( markup, "" ) != 0 )
 551                 pango_layout_set_markup( layout, markup, strlen( markup ) );
 552         else if ( text != NULL && strcmp( text, "" ) != 0 )
 553                 pango_layout_set_text( layout, text, strlen( text ) );
 554         else
 555                 return NULL;
 556         pango_layout_get_pixel_size( layout, &w, &h );
 557
 558         pixbuf = gdk_pixbuf_new( GDK_COLORSPACE_RGB, TRUE /* has alpha */, 8, w + 2 * pad, h + 2 * pad );
 559         pango_draw_background( pixbuf, bg );
 560
 561         stride = gdk_pixbuf_get_rowstride( pixbuf );
 562
 563         bitmap.width     = w;
 564         bitmap.pitch     = 32 * ( ( w + 31 ) / 31 );
 565         bitmap.rows      = h;
 566         bitmap.buffer    = mlt_pool_alloc( h * bitmap.pitch );
 567         bitmap.num_grays = 256;
 568         bitmap.pixel_mode = ft_pixel_mode_grays;
 569
 570         memset( bitmap.buffer, 0, h * bitmap.pitch );
 571
 572         pango_ft2_render_layout( &bitmap, layout, 0, 0 );
 573
 574         src = bitmap.buffer;
 575         x = ( gdk_pixbuf_get_width( pixbuf ) - w - 2 * pad ) * align / 2 + pad;
 576         dest = gdk_pixbuf_get_pixels( pixbuf ) + 4 * x + pad * stride;
 577         for ( j = 0; j < h; j++ )
 578         {
 579                 uint8_t *d = dest;
 580                 for ( i = 0; i < w; i++ )
 581                 {
 582                         float a = ( float ) bitmap.buffer[ j * bitmap.pitch + i ] / 255.0;
 583                         *d++ = ( int ) ( a * fg.r + ( 1 - a ) * bg.r );
 584                         *d++ = ( int ) ( a * fg.g + ( 1 - a ) * bg.g );
 585                         *d++ = ( int ) ( a * fg.b + ( 1 - a ) * bg.b );
 586                         *d++ = ( int ) ( a * fg.a + ( 1 - a ) * bg.a );
 587                 }
 588                 dest += stride;
 589         }
 590         mlt_pool_release( bitmap.buffer );
 591         g_object_unref( layout );
 592         g_object_unref( context );
 593         g_object_unref( fontmap );
 594
 595         return pixbuf;
 596 }