quartztext.c 41.2 KB
Newer Older
1 2 3 4 5 6
/*****************************************************************************
 * quartztext.c : Put text on the video, using Mac OS X Quartz Engine
 *****************************************************************************
 * Copyright (C) 2007 the VideoLAN team
 * $Id$
 *
7
 * Authors: Bernie Purcell <bitmap@videolan.org>
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

//////////////////////////////////////////////////////////////////////////////
// Preamble
//////////////////////////////////////////////////////////////////////////////

28 29 30 31
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

32
#include <vlc_common.h>
33
#include <vlc_plugin.h>
34 35 36 37 38 39
#include <vlc_vout.h>
#include <vlc_osd.h>
#include <vlc_block.h>
#include <vlc_filter.h>
#include <vlc_stream.h>
#include <vlc_xml.h>
40
#include <vlc_input.h>
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

#include <math.h>

#include <Carbon/Carbon.h>

#define DEFAULT_FONT           "Verdana"
#define DEFAULT_FONT_COLOR     0xffffff
#define DEFAULT_REL_FONT_SIZE  16

#define VERTICAL_MARGIN 3
#define HORIZONTAL_MARGIN 10

//////////////////////////////////////////////////////////////////////////////
// Local prototypes
//////////////////////////////////////////////////////////////////////////////
static int  Create ( vlc_object_t * );
static void Destroy( vlc_object_t * );

59 60
static int LoadFontsFromAttachments( filter_t *p_filter );

61 62 63 64 65
static int RenderText( filter_t *, subpicture_region_t *,
                       subpicture_region_t * );
static int RenderHtml( filter_t *, subpicture_region_t *,
                       subpicture_region_t * );

66
static int GetFontSize( filter_t *p_filter );
67 68 69 70 71
static int RenderYUVA( filter_t *p_filter, subpicture_region_t *p_region,
                       UniChar *psz_utfString, uint32_t i_text_len,
                       uint32_t i_runs, uint32_t *pi_run_lengths,
                       ATSUStyle *pp_styles );
static ATSUStyle CreateStyle( char *psz_fontname, int i_font_size,
72
                              uint32_t i_font_color,
73 74
                              bool b_bold, bool b_italic,
                              bool b_uline );
75 76 77 78 79 80 81 82 83
//////////////////////////////////////////////////////////////////////////////
// Module descriptor
//////////////////////////////////////////////////////////////////////////////

// The preferred way to set font style information is for it to come from the
// subtitle file, and for it to be rendered with RenderHtml instead of
// RenderText. This module, unlike Freetype, doesn't provide any options to
// override the fallback font selection used when this style information is
// absent.
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109
#define FONT_TEXT N_("Font")
#define FONT_LONGTEXT N_("Name for the font you want to use")
#define FONTSIZER_TEXT N_("Relative font size")
#define FONTSIZER_LONGTEXT N_("This is the relative default size of the " \
    "fonts that will be rendered on the video. If absolute font size is set, "\
    "relative size will be overriden." )
#define COLOR_TEXT N_("Text default color")
#define COLOR_LONGTEXT N_("The color of the text that will be rendered on "\
    "the video. This must be an hexadecimal (like HTML colors). The first two "\
    "chars are for red, then green, then blue. #000000 = black, #FF0000 = red,"\
    " #00FF00 = green, #FFFF00 = yellow (red + green), #FFFFFF = white" )

static const int pi_color_values[] = {
  0x00000000, 0x00808080, 0x00C0C0C0, 0x00FFFFFF, 0x00800000,
  0x00FF0000, 0x00FF00FF, 0x00FFFF00, 0x00808000, 0x00008000, 0x00008080,
  0x0000FF00, 0x00800080, 0x00000080, 0x000000FF, 0x0000FFFF };

static const char *const ppsz_color_descriptions[] = {
  N_("Black"), N_("Gray"), N_("Silver"), N_("White"), N_("Maroon"),
  N_("Red"), N_("Fuchsia"), N_("Yellow"), N_("Olive"), N_("Green"), N_("Teal"),
  N_("Lime"), N_("Purple"), N_("Navy"), N_("Blue"), N_("Aqua") };

static const int pi_sizes[] = { 20, 18, 16, 12, 6 };
static const char *const ppsz_sizes_text[] = {
    N_("Smaller"), N_("Small"), N_("Normal"), N_("Large"), N_("Larger") };

110
vlc_module_begin();
111 112
    set_shortname( N_("Mac Text renderer"));
    set_description( N_("Quartz font renderer") );
113 114 115
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_SUBPIC );

116 117 118 119
    add_string( "quartztext-font", DEFAULT_FONT, NULL, FONT_TEXT, FONT_LONGTEXT,
              false );
    add_integer( "quartztext-rel-fontsize", DEFAULT_REL_FONT_SIZE, NULL, FONTSIZER_TEXT,
                 FONTSIZER_LONGTEXT, false );
120
        change_integer_list( pi_sizes, ppsz_sizes_text, NULL );
121 122
    add_integer( "quartztext-color", 0x00FFFFFF, NULL, COLOR_TEXT,
                 COLOR_LONGTEXT, false );
123
        change_integer_list( pi_color_values, ppsz_color_descriptions, NULL );
124 125 126 127 128 129 130 131 132 133
    set_capability( "text renderer", 120 );
    add_shortcut( "text" );
    set_callbacks( Create, Destroy );
vlc_module_end();

typedef struct font_stack_t font_stack_t;
struct font_stack_t
{
    char          *psz_name;
    int            i_size;
134
    uint32_t       i_color;            // ARGB
135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160

    font_stack_t  *p_next;
};

typedef struct offscreen_bitmap_t offscreen_bitmap_t;
struct offscreen_bitmap_t
{
    uint8_t       *p_data;
    int            i_bitsPerChannel;
    int            i_bitsPerPixel;
    int            i_bytesPerPixel;
    int            i_bytesPerRow;
};

//////////////////////////////////////////////////////////////////////////////
// filter_sys_t: quartztext local data
//////////////////////////////////////////////////////////////////////////////
// This structure is part of the video output thread descriptor.
// It describes the freetype specific properties of an output thread.
//////////////////////////////////////////////////////////////////////////////
struct filter_sys_t
{
    char          *psz_font_name;
    uint8_t        i_font_opacity;
    int            i_font_color;
    int            i_font_size;
161 162 163

    ATSFontContainerRef    *p_fonts;
    int                     i_fonts;
164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
};

//////////////////////////////////////////////////////////////////////////////
// Create: allocates osd-text video thread output method
//////////////////////////////////////////////////////////////////////////////
// This function allocates and initializes a Clone vout method.
//////////////////////////////////////////////////////////////////////////////
static int Create( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
    filter_sys_t *p_sys;

    // Allocate structure
    p_filter->p_sys = p_sys = malloc( sizeof( filter_sys_t ) );
    if( !p_sys )
        return VLC_ENOMEM;
180
    p_sys->psz_font_name  = var_CreateGetString( p_this, "quartztext-font" );
181
    p_sys->i_font_opacity = 255;
182
    p_sys->i_font_color = __MAX( __MIN( var_CreateGetInteger( p_this, "quartztext-color" ) , 0xFFFFFF ), 0 );
183
    p_sys->i_font_size    = GetFontSize( p_filter );
184 185 186 187

    p_filter->pf_render_text = RenderText;
    p_filter->pf_render_html = RenderHtml;

188 189 190 191 192
    p_sys->p_fonts = NULL;
    p_sys->i_fonts = 0;

    LoadFontsFromAttachments( p_filter );

193 194 195 196 197 198 199 200 201 202 203 204 205
    return VLC_SUCCESS;
}

//////////////////////////////////////////////////////////////////////////////
// Destroy: destroy Clone video thread output method
//////////////////////////////////////////////////////////////////////////////
// Clean up all data and library connections
//////////////////////////////////////////////////////////////////////////////
static void Destroy( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
    filter_sys_t *p_sys = p_filter->p_sys;

206 207 208 209 210 211 212 213 214 215 216 217
    if( p_sys->p_fonts )
    {
        int   k;

        for( k = 0; k < p_sys->i_fonts; k++ )
        {
            ATSFontDeactivate( p_sys->p_fonts[k], NULL, kATSOptionFlagsDefault );
        }

        free( p_sys->p_fonts );
    }

218
    free( p_sys->psz_font_name );
219 220 221
    free( p_sys );
}

222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
//////////////////////////////////////////////////////////////////////////////
// Make any TTF/OTF fonts present in the attachments of the media file
// available to the Quartz engine for text rendering
//////////////////////////////////////////////////////////////////////////////
static int LoadFontsFromAttachments( filter_t *p_filter )
{
    filter_sys_t         *p_sys = p_filter->p_sys;
    input_thread_t       *p_input;
    input_attachment_t  **pp_attachments;
    int                   i_attachments_cnt;
    int                   k;
    int                   rv = VLC_SUCCESS;

    p_input = (input_thread_t *)vlc_object_find( p_filter, VLC_OBJECT_INPUT, FIND_PARENT );
    if( ! p_input )
        return VLC_EGENERIC;
Bernie Purcell's avatar
Bernie Purcell committed
238

239
    if( VLC_SUCCESS != input_Control( p_input, INPUT_GET_ATTACHMENTS, &pp_attachments, &i_attachments_cnt ))
240 241
    {
        vlc_object_release(p_input);
242
        return VLC_EGENERIC;
243
    }
244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276

    p_sys->i_fonts = 0;
    p_sys->p_fonts = malloc( i_attachments_cnt * sizeof( ATSFontContainerRef ) );
    if(! p_sys->p_fonts )
        rv = VLC_ENOMEM;

    for( k = 0; k < i_attachments_cnt; k++ )
    {
        input_attachment_t *p_attach = pp_attachments[k];

        if( p_sys->p_fonts )
        {
            if(( !strcmp( p_attach->psz_mime, "application/x-truetype-font" ) || // TTF
                 !strcmp( p_attach->psz_mime, "application/x-font-otf" ) ) &&    // OTF
               ( p_attach->i_data > 0 ) &&
               ( p_attach->p_data != NULL ) )
            {
                ATSFontContainerRef  container;

                if( noErr == ATSFontActivateFromMemory( p_attach->p_data,
                                                        p_attach->i_data,
                                                        kATSFontContextLocal,
                                                        kATSFontFormatUnspecified,
                                                        NULL,
                                                        kATSOptionFlagsDefault,
                                                        &container ))
                {
                    p_sys->p_fonts[ p_sys->i_fonts++ ] = container;
                }
            }
        }
        vlc_input_attachment_Delete( p_attach );
    }
Bernie Purcell's avatar
Bernie Purcell committed
277
    free( pp_attachments );
278

279 280
    vlc_object_release(p_input);

281 282 283
    return rv;
}

284 285 286 287
#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_4
// Original version of these functions available on:
// http://developer.apple.com/documentation/Carbon/Conceptual/QuickDrawToQuartz2D/tq_color/chapter_4_section_3.html

Bernie Purcell's avatar
Bernie Purcell committed
288 289
#define kGenericRGBProfilePathStr "/System/Library/ColorSync/Profiles/Generic RGB Profile.icc"

290 291 292
static CMProfileRef OpenGenericProfile( void )
{
    static CMProfileRef cached_rgb_prof = NULL;
Bernie Purcell's avatar
Bernie Purcell committed
293

294 295 296 297 298
    // Create the profile reference only once
    if( cached_rgb_prof == NULL )
    {
        OSStatus            err;
        CMProfileLocation   loc;
Bernie Purcell's avatar
Bernie Purcell committed
299

300 301
        loc.locType = cmPathBasedProfile;
        strcpy( loc.u.pathLoc.path, kGenericRGBProfilePathStr );
Bernie Purcell's avatar
Bernie Purcell committed
302

303
        err = CMOpenProfile( &cached_rgb_prof, &loc );
Bernie Purcell's avatar
Bernie Purcell committed
304

305 306 307 308 309
        if( err != noErr )
        {
            cached_rgb_prof = NULL;
        }
    }
Bernie Purcell's avatar
Bernie Purcell committed
310

311 312
    if( cached_rgb_prof )
    {
Bernie Purcell's avatar
Bernie Purcell committed
313
        // Clone the profile reference so that the caller has
314
        // their own reference, not our cached one.
Bernie Purcell's avatar
Bernie Purcell committed
315
        CMCloneProfileRef( cached_rgb_prof );
316
    }
Bernie Purcell's avatar
Bernie Purcell committed
317

318 319 320 321 322 323
    return cached_rgb_prof;
}

static CGColorSpaceRef CreateGenericRGBColorSpace( void )
{
    static CGColorSpaceRef p_generic_rgb_cs = NULL;
Bernie Purcell's avatar
Bernie Purcell committed
324

325 326 327
    if( p_generic_rgb_cs == NULL )
    {
        CMProfileRef generic_rgb_prof = OpenGenericProfile();
Bernie Purcell's avatar
Bernie Purcell committed
328

329 330 331
        if( generic_rgb_prof )
        {
            p_generic_rgb_cs = CGColorSpaceCreateWithPlatformColorSpace( generic_rgb_prof );
Bernie Purcell's avatar
Bernie Purcell committed
332 333

            CMCloseProfile( generic_rgb_prof );
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367
        }
    }

    return p_generic_rgb_cs;
}
#endif

static char *EliminateCRLF( char *psz_string )
{
    char *p;
    char *q;

    for( p = psz_string; p && *p; p++ )
    {
        if( ( *p == '\r' ) && ( *(p+1) == '\n' ) )
        {
            for( q = p + 1; *q; q++ )
                *( q - 1 ) = *q;

            *( q - 1 ) = '\0';
        }
    }
    return psz_string;
}

// Convert UTF-8 string to UTF-16 character array -- internal Mac Endian-ness ;
// we don't need to worry about bidirectional text conversion as ATSUI should
// handle that for us automatically
static void ConvertToUTF16( const char *psz_utf8_str, uint32_t *pi_strlen, UniChar **ppsz_utf16_str )
{
    CFStringRef   p_cfString;
    int           i_string_length;

    p_cfString = CFStringCreateWithCString( NULL, psz_utf8_str, kCFStringEncodingUTF8 );
368 369 370
    if( !p_cfString )
        return;

371 372 373 374 375 376 377 378 379
    i_string_length = CFStringGetLength( p_cfString );

    if( pi_strlen )
        *pi_strlen = i_string_length;

    if( !*ppsz_utf16_str )
        *ppsz_utf16_str = (UniChar *) calloc( i_string_length, sizeof( UniChar ) );

    CFStringGetCharacters( p_cfString, CFRangeMake( 0, i_string_length ), *ppsz_utf16_str );
Bernie Purcell's avatar
Bernie Purcell committed
380

381 382 383 384 385 386 387 388 389 390 391 392 393
    CFRelease( p_cfString );
}

// Renders a text subpicture region into another one.
// It is used as pf_add_string callback in the vout method by this module
static int RenderText( filter_t *p_filter, subpicture_region_t *p_region_out,
                       subpicture_region_t *p_region_in )
{
    filter_sys_t *p_sys = p_filter->p_sys;
    UniChar      *psz_utf16_str = NULL;
    uint32_t      i_string_length;
    char         *psz_string;
    int           i_font_color, i_font_alpha, i_font_size;
394 395 396 397
    vlc_value_t val;
    int i_scale = 1000;

    p_sys->i_font_size    = GetFontSize( p_filter );
398 399 400 401 402

    // Sanity check
    if( !p_region_in || !p_region_out ) return VLC_EGENERIC;
    psz_string = p_region_in->psz_text;
    if( !psz_string || !*psz_string ) return VLC_EGENERIC;
Bernie Purcell's avatar
Bernie Purcell committed
403

404 405 406
    if( VLC_SUCCESS == var_Get( p_filter, "scale", &val ))
        i_scale = val.i_int;

407 408 409 410
    if( p_region_in->p_style )
    {
        i_font_color = __MAX( __MIN( p_region_in->p_style->i_font_color, 0xFFFFFF ), 0 );
        i_font_alpha = __MAX( __MIN( p_region_in->p_style->i_font_alpha, 255 ), 0 );
411
        i_font_size  = __MAX( __MIN( p_region_in->p_style->i_font_size, 255 ), 0 ) * i_scale / 1000;
412 413 414 415 416 417 418 419 420
    }
    else
    {
        i_font_color = p_sys->i_font_color;
        i_font_alpha = 255 - p_sys->i_font_opacity;
        i_font_size  = p_sys->i_font_size;
    }

    if( !i_font_alpha ) i_font_alpha = 255 - p_sys->i_font_opacity;
Bernie Purcell's avatar
Bernie Purcell committed
421

422 423 424 425 426 427 428 429
    ConvertToUTF16( EliminateCRLF( psz_string ), &i_string_length, &psz_utf16_str );

    p_region_out->i_x = p_region_in->i_x;
    p_region_out->i_y = p_region_in->i_y;

    if( psz_utf16_str != NULL )
    {
        ATSUStyle p_style = CreateStyle( p_sys->psz_font_name, i_font_size,
430
                                         (i_font_color & 0xffffff) |
431
                                         ((i_font_alpha & 0xff) << 24),
432
                                         false, false, false );
433 434 435 436 437 438 439 440 441 442 443 444 445 446
        if( p_style )
        {
            RenderYUVA( p_filter, p_region_out, psz_utf16_str, i_string_length,
                        1, &i_string_length, &p_style );
        }

        ATSUDisposeStyle( p_style );
        free( psz_utf16_str );
    }

    return VLC_SUCCESS;
}


447
static ATSUStyle CreateStyle( char *psz_fontname, int i_font_size, uint32_t i_font_color,
448
                              bool b_bold, bool b_italic, bool b_uline )
449 450 451 452 453 454 455 456
{
    ATSUStyle   p_style;
    OSStatus    status;
    uint32_t    i_tag_cnt;

    float f_red   = (float)(( i_font_color & 0x00FF0000 ) >> 16) / 255.0;
    float f_green = (float)(( i_font_color & 0x0000FF00 ) >>  8) / 255.0;
    float f_blue  = (float)(  i_font_color & 0x000000FF        ) / 255.0;
457
    float f_alpha = ( 255.0 - (float)(( i_font_color & 0xFF000000 ) >> 24)) / 255.0;
458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499

    ATSUFontID           font;
    Fixed                font_size  = IntToFixed( i_font_size );
    ATSURGBAlphaColor    font_color = { f_red, f_green, f_blue, f_alpha };
    Boolean              bold       = b_bold;
    Boolean              italic     = b_italic;
    Boolean              uline      = b_uline;

    ATSUAttributeTag tags[]        = { kATSUSizeTag, kATSURGBAlphaColorTag, kATSUQDItalicTag,
                                       kATSUQDBoldfaceTag, kATSUQDUnderlineTag, kATSUFontTag };
    ByteCount sizes[]              = { sizeof( Fixed ), sizeof( ATSURGBAlphaColor ), sizeof( Boolean ),
                                       sizeof( Boolean ), sizeof( Boolean ), sizeof( ATSUFontID )};
    ATSUAttributeValuePtr values[] = { &font_size, &font_color, &italic, &bold, &uline, &font };

    i_tag_cnt = sizeof( tags ) / sizeof( ATSUAttributeTag );

    status = ATSUFindFontFromName( psz_fontname,
                                   strlen( psz_fontname ),
                                   kFontFullName,
                                   kFontNoPlatform,
                                   kFontNoScript,
                                   kFontNoLanguageCode,
                                   &font );

    if( status != noErr )
    {
        // If we can't find a suitable font, just do everything else
        i_tag_cnt--;
    }

    if( noErr == ATSUCreateStyle( &p_style ) )
    {
        if( noErr == ATSUSetAttributes( p_style, i_tag_cnt, tags, sizes, values ) )
        {
            return p_style;
        }
        ATSUDisposeStyle( p_style );
    }
    return NULL;
}

static int PushFont( font_stack_t **p_font, const char *psz_name, int i_size,
500
                     uint32_t i_color )
501 502 503 504 505 506 507
{
    font_stack_t *p_new;

    if( !p_font )
        return VLC_EGENERIC;

    p_new = malloc( sizeof( font_stack_t ) );
508 509 510
    if( ! p_new )
        return VLC_ENOMEM;

511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544
    p_new->p_next = NULL;

    if( psz_name )
        p_new->psz_name = strdup( psz_name );
    else
        p_new->psz_name = NULL;

    p_new->i_size   = i_size;
    p_new->i_color  = i_color;

    if( !*p_font )
    {
        *p_font = p_new;
    }
    else
    {
        font_stack_t *p_last;

        for( p_last = *p_font;
             p_last->p_next;
             p_last = p_last->p_next )
        ;

        p_last->p_next = p_new;
    }
    return VLC_SUCCESS;
}

static int PopFont( font_stack_t **p_font )
{
    font_stack_t *p_last, *p_next_to_last;

    if( !p_font || !*p_font )
        return VLC_EGENERIC;
Bernie Purcell's avatar
Bernie Purcell committed
545

546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565
    p_next_to_last = NULL;
    for( p_last = *p_font;
         p_last->p_next;
         p_last = p_last->p_next )
    {
        p_next_to_last = p_last;
    }

    if( p_next_to_last )
        p_next_to_last->p_next = NULL;
    else
        *p_font = NULL;

    free( p_last->psz_name );
    free( p_last );

    return VLC_SUCCESS;
}

static int PeekFont( font_stack_t **p_font, char **psz_name, int *i_size,
566
                     uint32_t *i_color )
567 568 569 570 571
{
    font_stack_t *p_last;

    if( !p_font || !*p_font )
        return VLC_EGENERIC;
Bernie Purcell's avatar
Bernie Purcell committed
572

573 574 575 576 577 578 579 580 581 582 583 584
    for( p_last=*p_font;
         p_last->p_next;
         p_last=p_last->p_next )
    ;

    *psz_name = p_last->psz_name;
    *i_size   = p_last->i_size;
    *i_color  = p_last->i_color;

    return VLC_SUCCESS;
}

585
static ATSUStyle GetStyleFromFontStack( filter_sys_t *p_sys,
586 587
        font_stack_t **p_fonts, bool b_bold, bool b_italic,
        bool b_uline )
588 589 590
{
    ATSUStyle   p_style = NULL;

591 592 593
    char     *psz_fontname = NULL;
    uint32_t  i_font_color = p_sys->i_font_color;
    int       i_font_size  = p_sys->i_font_size;
594

595 596
    if( VLC_SUCCESS == PeekFont( p_fonts, &psz_fontname, &i_font_size,
                                 &i_font_color ))
597
    {
598
        p_style = CreateStyle( psz_fontname, i_font_size, i_font_color,
599 600 601 602 603
                               b_bold, b_italic, b_uline );
    }
    return p_style;
}

604
static int HandleFontAttributes( xml_reader_t *p_xml_reader,
605
                                  font_stack_t **p_fonts, int i_scale )
606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
{
    int        rv;
    char      *psz_fontname = NULL;
    uint32_t   i_font_color = 0xffffff;
    int        i_font_alpha = 0;
    int        i_font_size  = 24;

    // Default all attributes to the top font in the stack -- in case not
    // all attributes are specified in the sub-font
    if( VLC_SUCCESS == PeekFont( p_fonts,
                                 &psz_fontname,
                                 &i_font_size,
                                 &i_font_color ))
    {
        psz_fontname = strdup( psz_fontname );
621
        i_font_size = i_font_size * 1000 / i_scale;
622 623 624 625 626 627 628 629 630 631 632 633 634
    }
    i_font_alpha = (i_font_color >> 24) & 0xff;
    i_font_color &= 0x00ffffff;

    while ( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
    {
        char *psz_name = xml_ReaderName( p_xml_reader );
        char *psz_value = xml_ReaderValue( p_xml_reader );

        if( psz_name && psz_value )
        {
            if( !strcasecmp( "face", psz_name ) )
            {
635
                free( psz_fontname );
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
                psz_fontname = strdup( psz_value );
            }
            else if( !strcasecmp( "size", psz_name ) )
            {
                if( ( *psz_value == '+' ) || ( *psz_value == '-' ) )
                {
                    int i_value = atoi( psz_value );

                    if( ( i_value >= -5 ) && ( i_value <= 5 ) )
                        i_font_size += ( i_value * i_font_size ) / 10;
                    else if( i_value < -5 )
                        i_font_size = - i_value;
                    else if( i_value > 5 )
                        i_font_size = i_value;
                }
                else
                    i_font_size = atoi( psz_value );
            }
            else if( !strcasecmp( "color", psz_name )  &&
                     ( psz_value[0] == '#' ) )
            {
                i_font_color = strtol( psz_value + 1, NULL, 16 );
                i_font_color &= 0x00ffffff;
            }
            else if( !strcasecmp( "alpha", psz_name ) &&
                     ( psz_value[0] == '#' ) )
            {
                i_font_alpha = strtol( psz_value + 1, NULL, 16 );
                i_font_alpha &= 0xff;
            }
        }
Rémi Duraffort's avatar
Rémi Duraffort committed
667 668
        free( psz_name );
        free( psz_value );
669 670 671
    }
    rv = PushFont( p_fonts,
                   psz_fontname,
672 673
                   i_font_size * i_scale / 1000,
                   (i_font_color & 0xffffff) | ((i_font_alpha & 0xff) << 24) );
674 675 676 677 678 679 680 681 682 683 684 685 686 687 688

    free( psz_fontname );

    return rv;
}

static int ProcessNodes( filter_t *p_filter,
                         xml_reader_t *p_xml_reader,
                         text_style_t *p_font_style,
                         UniChar *psz_text,
                         int *pi_len,

                         uint32_t *pi_runs,
                         uint32_t **ppi_run_lengths,
                         ATSUStyle **ppp_styles )
689
{
690
    int           rv             = VLC_SUCCESS;
691 692 693
    filter_sys_t *p_sys          = p_filter->p_sys;
    UniChar      *psz_text_orig  = psz_text;
    font_stack_t *p_fonts        = NULL;
694 695
    vlc_value_t   val;
    int           i_scale        = 1000;
696 697 698

    char *psz_node  = NULL;

699 700 701
    bool b_italic = false;
    bool b_bold   = false;
    bool b_uline  = false;
702

703 704 705
    if( VLC_SUCCESS == var_Get( p_filter, "scale", &val ))
        i_scale = val.i_int;

706 707
    if( p_font_style )
    {
708 709
        rv = PushFont( &p_fonts,
               p_font_style->psz_fontname,
710
               p_font_style->i_font_size * i_scale / 1000,
711 712
               (p_font_style->i_font_color & 0xffffff) |
                   ((p_font_style->i_font_alpha & 0xff) << 24) );
Bernie Purcell's avatar
Bernie Purcell committed
713

714
        if( p_font_style->i_style_flags & STYLE_BOLD )
715
            b_bold = true;
716
        if( p_font_style->i_style_flags & STYLE_ITALIC )
717
            b_italic = true;
718
        if( p_font_style->i_style_flags & STYLE_UNDERLINE )
719
            b_uline = true;
720 721 722
    }
    else
    {
723 724 725
        rv = PushFont( &p_fonts,
                       p_sys->psz_font_name,
                       p_sys->i_font_size,
726
                       p_sys->i_font_color );
727
    }
728 729
    if( rv != VLC_SUCCESS )
        return rv;
730 731 732 733 734 735 736 737 738 739 740 741 742 743

    while ( ( xml_ReaderRead( p_xml_reader ) == 1 ) )
    {
        switch ( xml_ReaderNodeType( p_xml_reader ) )
        {
            case XML_READER_NONE:
                break;
            case XML_READER_ENDELEM:
                psz_node = xml_ReaderName( p_xml_reader );
                if( psz_node )
                {
                    if( !strcasecmp( "font", psz_node ) )
                        PopFont( &p_fonts );
                    else if( !strcasecmp( "b", psz_node ) )
744
                        b_bold   = false;
745
                    else if( !strcasecmp( "i", psz_node ) )
746
                        b_italic = false;
747
                    else if( !strcasecmp( "u", psz_node ) )
748
                        b_uline  = false;
Bernie Purcell's avatar
Bernie Purcell committed
749

750 751 752 753 754 755 756 757
                    free( psz_node );
                }
                break;
            case XML_READER_STARTELEM:
                psz_node = xml_ReaderName( p_xml_reader );
                if( psz_node )
                {
                    if( !strcasecmp( "font", psz_node ) )
758
                        rv = HandleFontAttributes( p_xml_reader, &p_fonts, i_scale );
759
                    else if( !strcasecmp( "b", psz_node ) )
760
                        b_bold = true;
761
                    else if( !strcasecmp( "i", psz_node ) )
762
                        b_italic = true;
763
                    else if( !strcasecmp( "u", psz_node ) )
764
                        b_uline = true;
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
                    else if( !strcasecmp( "br", psz_node ) )
                    {
                        uint32_t i_string_length;

                        ConvertToUTF16( "\n", &i_string_length, &psz_text );
                        psz_text += i_string_length;

                        (*pi_runs)++;

                        if( *ppp_styles )
                            *ppp_styles = (ATSUStyle *) realloc( *ppp_styles, *pi_runs * sizeof( ATSUStyle ) );
                        else
                            *ppp_styles = (ATSUStyle *) malloc( *pi_runs * sizeof( ATSUStyle ) );

                        (*ppp_styles)[ *pi_runs - 1 ] = GetStyleFromFontStack( p_sys, &p_fonts, b_bold, b_italic, b_uline );

                        if( *ppi_run_lengths )
                            *ppi_run_lengths = (uint32_t *) realloc( *ppi_run_lengths, *pi_runs * sizeof( uint32_t ) );
                        else
                            *ppi_run_lengths = (uint32_t *) malloc( *pi_runs * sizeof( uint32_t ) );

                        (*ppi_run_lengths)[ *pi_runs - 1 ] = i_string_length;
                    }
                    free( psz_node );
                }
                break;
            case XML_READER_TEXT:
                psz_node = xml_ReaderValue( p_xml_reader );
                if( psz_node )
                {
                    uint32_t i_string_length;

797 798 799 800 801 802 803 804 805 806 807 808 809 810 811
                    // Turn any multiple-whitespaces into single spaces
                    char *s = strpbrk( psz_node, "\t\r\n " );
                    while( s )
                    {
                        int i_whitespace = strspn( s, "\t\r\n " );

                        if( i_whitespace > 1 )
                            memmove( &s[1],
                                     &s[i_whitespace],
                                     strlen( s ) - i_whitespace + 1 );
                        *s++ = ' ';

                        s = strpbrk( s, "\t\r\n " );
                    }

812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
                    ConvertToUTF16( psz_node, &i_string_length, &psz_text );
                    psz_text += i_string_length;

                    (*pi_runs)++;

                    if( *ppp_styles )
                        *ppp_styles = (ATSUStyle *) realloc( *ppp_styles, *pi_runs * sizeof( ATSUStyle ) );
                    else
                        *ppp_styles = (ATSUStyle *) malloc( *pi_runs * sizeof( ATSUStyle ) );

                    (*ppp_styles)[ *pi_runs - 1 ] = GetStyleFromFontStack( p_sys, &p_fonts, b_bold, b_italic, b_uline );

                    if( *ppi_run_lengths )
                        *ppi_run_lengths = (uint32_t *) realloc( *ppi_run_lengths, *pi_runs * sizeof( uint32_t ) );
                    else
                        *ppi_run_lengths = (uint32_t *) malloc( *pi_runs * sizeof( uint32_t ) );

                    (*ppi_run_lengths)[ *pi_runs - 1 ] = i_string_length;

                    free( psz_node );
                }
                break;
        }
    }

    *pi_len = psz_text - psz_text_orig;

    while( VLC_SUCCESS == PopFont( &p_fonts ) );
Bernie Purcell's avatar
Oops  
Bernie Purcell committed
840 841

    return rv;
842 843 844 845 846 847 848 849 850 851 852 853 854
}

static int RenderHtml( filter_t *p_filter, subpicture_region_t *p_region_out,
                       subpicture_region_t *p_region_in )
{
    int          rv = VLC_SUCCESS;
    stream_t     *p_sub = NULL;
    xml_t        *p_xml = NULL;
    xml_reader_t *p_xml_reader = NULL;

    if( !p_region_in || !p_region_in->psz_html )
        return VLC_EGENERIC;

855 856 857
    /* Reset the default fontsize in case screen metrics have changed */
    p_filter->p_sys->i_font_size = GetFontSize( p_filter );

858 859 860
    p_sub = stream_MemoryNew( VLC_OBJECT(p_filter),
                              (uint8_t *) p_region_in->psz_html,
                              strlen( p_region_in->psz_html ),
861
                              true );
862 863 864 865 866
    if( p_sub )
    {
        p_xml = xml_Create( p_filter );
        if( p_xml )
        {
867
            bool b_karaoke = false;
868

869
            p_xml_reader = xml_ReaderCreate( p_xml, p_sub );
870 871 872 873 874 875 876 877 878 879 880 881
            if( p_xml_reader )
            {
                /* Look for Root Node */
                if( xml_ReaderRead( p_xml_reader ) == 1 )
                {
                    char *psz_node = xml_ReaderName( p_xml_reader );

                    if( !strcasecmp( "karaoke", psz_node ) )
                    {
                        /* We're going to have to render the text a number
                         * of times to show the progress marker on the text.
                         */
882 883
                        var_SetBool( p_filter, "text-rerender", true );
                        b_karaoke = true;
884 885 886
                    }
                    else if( !strcasecmp( "text", psz_node ) )
                    {
887
                        b_karaoke = false;
888 889 890 891 892 893 894 895 896 897 898 899 900
                    }
                    else
                    {
                        /* Only text and karaoke tags are supported */
                        xml_ReaderDelete( p_xml, p_xml_reader );
                        p_xml_reader = NULL;
                        rv = VLC_EGENERIC;
                    }

                    free( psz_node );
                }
            }

901 902 903
            if( p_xml_reader )
            {
                UniChar    *psz_text;
Bernie Purcell's avatar
Oops  
Bernie Purcell committed
904
                int         i_len = 0;
905 906 907 908
                uint32_t    i_runs = 0;
                uint32_t   *pi_run_lengths = NULL;
                ATSUStyle  *pp_styles = NULL;

909 910
                psz_text = (UniChar *) malloc( strlen( p_region_in->psz_html ) *
                                                sizeof( UniChar ) );
911 912 913 914
                if( psz_text )
                {
                    uint32_t k;

915 916 917
                    rv = ProcessNodes( p_filter, p_xml_reader,
                                  p_region_in->p_style, psz_text, &i_len,
                                  &i_runs, &pi_run_lengths, &pp_styles );
918 919 920 921

                    p_region_out->i_x = p_region_in->i_x;
                    p_region_out->i_y = p_region_in->i_y;

922 923 924 925 926
                    if(( rv == VLC_SUCCESS ) && ( i_len > 0 ))
                    {
                        RenderYUVA( p_filter, p_region_out, psz_text, i_len, i_runs,
                             pi_run_lengths, pp_styles);
                    }
927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996

                    for( k=0; k<i_runs; k++)
                        ATSUDisposeStyle( pp_styles[k] );
                    free( pp_styles );
                    free( pi_run_lengths );
                    free( psz_text );
                }

                xml_ReaderDelete( p_xml, p_xml_reader );
            }
            xml_Delete( p_xml );
        }
        stream_Delete( p_sub );
    }

    return rv;
}

static CGContextRef CreateOffScreenContext( int i_width, int i_height,
                         offscreen_bitmap_t **pp_memory, CGColorSpaceRef *pp_colorSpace )
{
    offscreen_bitmap_t *p_bitmap;
    CGContextRef        p_context = NULL;

    p_bitmap = (offscreen_bitmap_t *) malloc( sizeof( offscreen_bitmap_t ));
    if( p_bitmap )
    {
        p_bitmap->i_bitsPerChannel = 8;
        p_bitmap->i_bitsPerPixel   = 4 * p_bitmap->i_bitsPerChannel; // A,R,G,B
        p_bitmap->i_bytesPerPixel  = p_bitmap->i_bitsPerPixel / 8;
        p_bitmap->i_bytesPerRow    = i_width * p_bitmap->i_bytesPerPixel;

        p_bitmap->p_data = calloc( i_height, p_bitmap->i_bytesPerRow );

#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_4
        *pp_colorSpace = CGColorSpaceCreateWithName( kCGColorSpaceGenericRGB );
#else
        *pp_colorSpace = CreateGenericRGBColorSpace();
#endif

        if( p_bitmap->p_data && *pp_colorSpace )
        {
            p_context = CGBitmapContextCreate( p_bitmap->p_data, i_width, i_height,
                                p_bitmap->i_bitsPerChannel, p_bitmap->i_bytesPerRow,
                                *pp_colorSpace, kCGImageAlphaPremultipliedFirst);
        }
        if( p_context )
        {
#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_1
            // OS X 10.1 doesn't support weak linking of this call which is only available
            // int 10.4 and later
            if( CGContextSetAllowsAntialiasing != NULL )
            {
                CGContextSetAllowsAntialiasing( p_context, true );
            }
#endif
        }
        *pp_memory = p_bitmap;
    }

    return p_context;
}

static offscreen_bitmap_t *Compose( int i_text_align, UniChar *psz_utf16_str, uint32_t i_text_len,
                                    uint32_t i_runs, uint32_t *pi_run_lengths, ATSUStyle *pp_styles,
                                    int i_width, int i_height, int *pi_textblock_height )
{
    offscreen_bitmap_t  *p_offScreen  = NULL;
    CGColorSpaceRef      p_colorSpace = NULL;
    CGContextRef         p_context = NULL;
Bernie Purcell's avatar
Bernie Purcell committed
997

998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
    p_context = CreateOffScreenContext( i_width, i_height, &p_offScreen, &p_colorSpace );

    if( p_context )
    {
        ATSUTextLayout p_textLayout;
        OSStatus status = noErr;

        status = ATSUCreateTextLayoutWithTextPtr( psz_utf16_str, 0, i_text_len, i_text_len,
                                                  i_runs,
                                                  (const UniCharCount *) pi_run_lengths,
                                                  pp_styles,
                                                  &p_textLayout );
        if( status == noErr )
        {
            // Attach our offscreen Image Graphics Context to the text style
            // and setup the line alignment (have to specify the line width
            // also in order for our chosen alignment to work)

            Fract   alignment  = kATSUStartAlignment;
            Fixed   line_width = Long2Fix( i_width - HORIZONTAL_MARGIN * 2 );

            ATSUAttributeTag tags[]        = { kATSUCGContextTag, kATSULineFlushFactorTag, kATSULineWidthTag };
            ByteCount sizes[]              = { sizeof( CGContextRef ), sizeof( Fract ), sizeof( Fixed ) };
            ATSUAttributeValuePtr values[] = { &p_context, &alignment, &line_width };

            int i_tag_cnt = sizeof( tags ) / sizeof( ATSUAttributeTag );

            if( i_text_align == SUBPICTURE_ALIGN_RIGHT )
            {
                alignment = kATSUEndAlignment;
            }
Bernie Purcell's avatar
Bernie Purcell committed
1029
            else if( i_text_align != SUBPICTURE_ALIGN_LEFT )
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
            {
                alignment = kATSUCenterAlignment;
            }

            ATSUSetLayoutControls( p_textLayout, i_tag_cnt, tags, sizes, values );

            // let ATSUI deal with characters not-in-our-specified-font
            ATSUSetTransientFontMatching( p_textLayout, true );

            Fixed x = Long2Fix( HORIZONTAL_MARGIN );
            Fixed y = Long2Fix( i_height );

            // Set the line-breaks and draw individual lines
            uint32_t i_start = 0;
            uint32_t i_end = i_text_len;

Bernie Purcell's avatar
Bernie Purcell committed
1046
            // Set up black outlining of the text --
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
            CGContextSetRGBStrokeColor( p_context, 0, 0, 0, 0.5 );
            CGContextSetTextDrawingMode( p_context, kCGTextFillStroke );

            do
            {
                // ATSUBreakLine will automatically pick up any manual '\n's also
                status = ATSUBreakLine( p_textLayout, i_start, line_width, true, (UniCharArrayOffset *) &i_end );
                if( ( status == noErr ) || ( status == kATSULineBreakInWord ) )
                {
                    Fixed     ascent;
                    Fixed     descent;
                    uint32_t  i_actualSize;

                    // Come down far enough to fit the height of this line --
                    ATSUGetLineControl( p_textLayout, i_start, kATSULineAscentTag,
                                    sizeof( Fixed ), &ascent, (ByteCount *) &i_actualSize );

                    // Quartz uses an upside-down co-ordinate space -> y values decrease as
                    // you move down the page
                    y -= ascent;

Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
1068
                    // Set the outlining for this line to be dependent on the size of the line -
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
                    // make it about 5% of the ascent, with a minimum at 1.0
                    float f_thickness = FixedToFloat( ascent ) * 0.05;
                    CGContextSetLineWidth( p_context, (( f_thickness > 1.0 ) ? 1.0 : f_thickness ));

                    ATSUDrawText( p_textLayout, i_start, i_end - i_start, x, y );

                    // and now prepare for the next line by coming down far enough for our
                    // descent
                    ATSUGetLineControl( p_textLayout, i_start, kATSULineDescentTag,
                                    sizeof( Fixed ), &descent, (ByteCount *) &i_actualSize );
                    y -= descent;

                    i_start = i_end;
                }
                else
                    break;
            }
            while( i_end < i_text_len );

            *pi_textblock_height = i_height - Fix2Long( y );
            CGContextFlush( p_context );

            ATSUDisposeTextLayout( p_textLayout );
        }

        CGContextRelease( p_context );
    }
    if( p_colorSpace ) CGColorSpaceRelease( p_colorSpace );

    return p_offScreen;
}

1101 1102
static int GetFontSize( filter_t *p_filter )
{
1103
    return p_filter->fmt_out.video.i_height / __MAX(1, var_CreateGetInteger( p_filter, "quartztext-rel-fontsize" ));
1104 1105
}

1106 1107 1108 1109 1110 1111 1112 1113
static int RenderYUVA( filter_t *p_filter, subpicture_region_t *p_region, UniChar *psz_utf16_str,
                       uint32_t i_text_len, uint32_t i_runs, uint32_t *pi_run_lengths, ATSUStyle *pp_styles )
{
    offscreen_bitmap_t *p_offScreen = NULL;
    int      i_textblock_height = 0;

    int i_width = p_filter->fmt_out.video.i_visible_width;
    int i_height = p_filter->fmt_out.video.i_visible_height;
1114
    int i_text_align = p_region->i_align & 0x3;
1115

1116
    if( !psz_utf16_str )
1117
    {
1118 1119 1120
        msg_Err( p_filter, "Invalid argument to RenderYUVA" );
        return VLC_EGENERIC;
    }
1121

1122 1123 1124 1125 1126 1127 1128 1129
    p_offScreen = Compose( i_text_align, psz_utf16_str, i_text_len,
                           i_runs, pi_run_lengths, pp_styles,
                           i_width, i_height, &i_textblock_height );

    if( !p_offScreen )
    {
        msg_Err( p_filter, "No offscreen buffer" );
        return VLC_EGENERIC;
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
    }

    uint8_t *p_dst_y,*p_dst_u,*p_dst_v,*p_dst_a;
    video_format_t fmt;
    int x, y, i_offset, i_pitch;
    uint8_t i_y, i_u, i_v; // YUV values, derived from incoming RGB
    subpicture_region_t *p_region_tmp;

    // Create a new subpicture region
    memset( &fmt, 0, sizeof(video_format_t) );
    fmt.i_chroma = VLC_FOURCC('Y','U','V','A');
    fmt.i_aspect = 0;
    fmt.i_width = fmt.i_visible_width = i_width;
    fmt.i_height = fmt.i_visible_height = i_textblock_height + VERTICAL_MARGIN * 2;
    fmt.i_x_offset = fmt.i_y_offset = 0;
    p_region_tmp = spu_CreateRegion( p_filter, &fmt );
    if( !p_region_tmp )
    {
        msg_Err( p_filter, "cannot allocate SPU region" );
        return VLC_EGENERIC;
    }
    p_region->fmt = p_region_tmp->fmt;
    p_region->picture = p_region_tmp->picture;
    free( p_region_tmp );

    p_dst_y = p_region->picture.Y_PIXELS;
    p_dst_u = p_region->picture.U_PIXELS;
    p_dst_v = p_region->picture.V_PIXELS;
    p_dst_a = p_region->picture.A_PIXELS;
    i_pitch = p_region->picture.A_PITCH;

    i_offset = VERTICAL_MARGIN *i_pitch;
    for( y=0; y<i_textblock_height; y++)
    {
        for( x=0; x<i_width; x++)
        {
            int i_alpha = p_offScreen->p_data[ y * p_offScreen->i_bytesPerRow + x * p_offScreen->i_bytesPerPixel     ];
            int i_red   = p_offScreen->p_data[ y * p_offScreen->i_bytesPerRow + x * p_offScreen->i_bytesPerPixel + 1 ];
            int i_green = p_offScreen->p_data[ y * p_offScreen->i_bytesPerRow + x * p_offScreen->i_bytesPerPixel + 2 ];
            int i_blue  = p_offScreen->p_data[ y * p_offScreen->i_bytesPerRow + x * p_offScreen->i_bytesPerPixel + 3 ];

            i_y = (uint8_t)__MIN(abs( 2104 * i_red  + 4130 * i_green +
                              802 * i_blue + 4096 + 131072 ) >> 13, 235);
            i_u = (uint8_t)__MIN(abs( -1214 * i_red  + -2384 * i_green +
                             3598 * i_blue + 4096 + 1048576) >> 13, 240);
            i_v = (uint8_t)__MIN(abs( 3598 * i_red + -3013 * i_green +
                              -585 * i_blue + 4096 + 1048576) >> 13, 240);

            p_dst_y[ i_offset + x ] = i_y;
            p_dst_u[ i_offset + x ] = i_u;
            p_dst_v[ i_offset + x ] = i_v;
            p_dst_a[ i_offset + x ] = i_alpha;
        }
        i_offset += i_pitch;
    }

    free( p_offScreen->p_data );
    free( p_offScreen );

    return VLC_SUCCESS;
}