quartztext.c 35 KB
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/*****************************************************************************
 * quartztext.c : Put text on the video, using Mac OS X Quartz Engine
 *****************************************************************************
 * Copyright (C) 2007 the VideoLAN team
 * $Id$
 *
 * Authors: Bernie Purcell <b dot purcell at adbglobal dot com>
 *
 * 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
//////////////////////////////////////////////////////////////////////////////
#include <stdlib.h>                                      // malloc(), free()
#include <string.h>

#include <vlc/vlc.h>
#include <vlc_vout.h>
#include <vlc_osd.h>
#include <vlc_block.h>
#include <vlc_filter.h>
#include <vlc_stream.h>
#include <vlc_xml.h>

#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 * );

static int RenderText( filter_t *, subpicture_region_t *,
                       subpicture_region_t * );
static int RenderHtml( filter_t *, subpicture_region_t *,
                       subpicture_region_t * );

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,
                              int i_font_color, int i_font_alpha,
                              vlc_bool_t b_bold, vlc_bool_t b_italic,
                              vlc_bool_t b_uline );
//////////////////////////////////////////////////////////////////////////////
// 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.
vlc_module_begin();
    set_shortname( _("Mac Text renderer"));
    set_description( _("Quartz font renderer") );
    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_SUBPIC );

    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;
    int            i_color;
    int            i_alpha;

    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;
};

//////////////////////////////////////////////////////////////////////////////
// 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 )
    {
        msg_Err( p_filter, "out of memory" );
        return VLC_ENOMEM;
    }
    p_sys->psz_font_name  = strdup( DEFAULT_FONT );
    p_sys->i_font_opacity = 255;
    p_sys->i_font_color   = DEFAULT_FONT_COLOR;
    p_sys->i_font_size    = p_filter->fmt_out.video.i_height / DEFAULT_REL_FONT_SIZE;

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

    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;

    free( p_sys->psz_font_name );
    free( p_sys );
}

#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

#define kGenericRGBProfilePathStr "/System/Library/ColorSync/Profiles/Generic RGB Profile.icc" 
 
static CMProfileRef OpenGenericProfile( void )
{
    static CMProfileRef cached_rgb_prof = NULL;
 
    // Create the profile reference only once
    if( cached_rgb_prof == NULL )
    {
        OSStatus            err;
        CMProfileLocation   loc;
 
        loc.locType = cmPathBasedProfile;
        strcpy( loc.u.pathLoc.path, kGenericRGBProfilePathStr );
 
        err = CMOpenProfile( &cached_rgb_prof, &loc );
 
        if( err != noErr )
        {
            cached_rgb_prof = NULL;
        }
    }
 
    if( cached_rgb_prof )
    {
        // Clone the profile reference so that the caller has 
        // their own reference, not our cached one.
        CMCloneProfileRef( cached_rgb_prof );   
    }
 
    return cached_rgb_prof;
}

static CGColorSpaceRef CreateGenericRGBColorSpace( void )
{
    static CGColorSpaceRef p_generic_rgb_cs = NULL;
 
    if( p_generic_rgb_cs == NULL )
    {
        CMProfileRef generic_rgb_prof = OpenGenericProfile();
 
        if( generic_rgb_prof )
        {
            p_generic_rgb_cs = CGColorSpaceCreateWithPlatformColorSpace( generic_rgb_prof );
 
            CMCloseProfile( generic_rgb_prof ); 
        }
    }

    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 );
    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 );
    
    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;

    // 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;
    
    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 );
        i_font_size  = __MAX( __MIN( p_region_in->p_style->i_font_size, 255 ), 0 );
    }
    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;
    
    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,
                                         i_font_color, i_font_alpha,
                                         VLC_FALSE, VLC_FALSE, VLC_FALSE );
        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;
}


static ATSUStyle CreateStyle( char *psz_fontname, int i_font_size, int i_font_color, int i_font_alpha,
                              vlc_bool_t b_bold, vlc_bool_t b_italic, vlc_bool_t b_uline )
{
    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;
    float f_alpha = ( 255.0 - (float)i_font_alpha) / 255.0;

    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,
                     int i_color, int i_alpha )
{
    font_stack_t *p_new;

    if( !p_font )
        return VLC_EGENERIC;

    p_new = malloc( sizeof( font_stack_t ) );
    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;
    p_new->i_alpha  = i_alpha;

    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;
    
    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,
                     int *i_color, int *i_alpha )
{
    font_stack_t *p_last;

    if( !p_font || !*p_font )
        return VLC_EGENERIC;
    
    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;
    *i_alpha  = p_last->i_alpha;

    return VLC_SUCCESS;
}

static ATSUStyle GetStyleFromFontStack( filter_sys_t *p_sys, font_stack_t **p_fonts,
                              vlc_bool_t b_bold, vlc_bool_t b_italic, vlc_bool_t b_uline )
{
    ATSUStyle   p_style = NULL;

    char  *psz_fontname = NULL;
    int    i_font_color = p_sys->i_font_color;
    int    i_font_alpha = 0;
    int    i_font_size  = p_sys->i_font_size;

    if( VLC_SUCCESS == PeekFont( p_fonts, &psz_fontname, &i_font_size, &i_font_color, &i_font_alpha ) )
    {
        p_style = CreateStyle( psz_fontname, i_font_size, i_font_color, i_font_alpha,
                               b_bold, b_italic, b_uline );
    }
    return p_style;
}

static void 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)
{
    filter_sys_t *p_sys          = p_filter->p_sys;
    UniChar      *psz_text_orig  = psz_text;
    font_stack_t *p_fonts        = NULL;

    char *psz_node  = NULL;

    vlc_bool_t b_italic = VLC_FALSE;
    vlc_bool_t b_bold   = VLC_FALSE;
    vlc_bool_t b_uline  = VLC_FALSE;

    if( p_font_style )
    {
        PushFont( &p_fonts, 
                  p_font_style->psz_fontname,
                  p_font_style->i_font_size,
                  p_font_style->i_font_color,
                  p_font_style->i_font_alpha );
        
        if( p_font_style->i_style_flags & STYLE_BOLD )
            b_bold = VLC_TRUE;
        if( p_font_style->i_style_flags & STYLE_ITALIC )
            b_italic = VLC_TRUE;
        if( p_font_style->i_style_flags & STYLE_UNDERLINE )
            b_uline = VLC_TRUE;
    }
    else
    {
        PushFont( &p_fonts, p_sys->psz_font_name, p_sys->i_font_size, p_sys->i_font_color, 0 );
    }

    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 ) )
                        b_bold   = VLC_FALSE;
                    else if( !strcasecmp( "i", psz_node ) )
                        b_italic = VLC_FALSE;
                    else if( !strcasecmp( "u", psz_node ) )
                        b_uline  = VLC_FALSE;
                    
                    free( psz_node );
                }
                break;
            case XML_READER_STARTELEM:
                psz_node = xml_ReaderName( p_xml_reader );
                if( psz_node )
                {
                    if( !strcasecmp( "font", psz_node ) )
                    {
                        char *psz_fontname = NULL;
                        int   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, &i_font_alpha ))
                        {
                            psz_fontname = strdup( psz_fontname );
                        }

                        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 ) )
                                {
                                    if( psz_fontname ) free( psz_fontname );
                                    psz_fontname = strdup( psz_value );
                                }
                                else if( !strcasecmp( "size", psz_name ) )
                                {
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                                    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 );
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                                }
                                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;
                                }
                                free( psz_name );
                                free( psz_value );
                            }
                        }
                        PushFont( &p_fonts, psz_fontname, i_font_size, i_font_color, i_font_alpha );
                        free( psz_fontname );
                    }
                    else if( !strcasecmp( "b", psz_node ) )
                    {
                        b_bold = VLC_TRUE;
                    }
                    else if( !strcasecmp( "i", psz_node ) )
                    {
                        b_italic = VLC_TRUE;
                    }
                    else if( !strcasecmp( "u", psz_node ) )
                    {
                        b_uline = VLC_TRUE;
                    }
                    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;

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                    // 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 " );
                    }

654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
                    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 ) );
}

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;

    p_sub = stream_MemoryNew( VLC_OBJECT(p_filter),
                              (uint8_t *) p_region_in->psz_html,
                              strlen( p_region_in->psz_html ),
                              VLC_TRUE );
    if( p_sub )
    {
        p_xml = xml_Create( p_filter );
        if( p_xml )
        {
            p_xml_reader = xml_ReaderCreate( p_xml, p_sub );
            if( p_xml_reader )
            {
                UniChar    *psz_text;
                int         i_len;
                uint32_t    i_runs = 0;
                uint32_t   *pi_run_lengths = NULL;
                ATSUStyle  *pp_styles = NULL;

                psz_text = (UniChar *) calloc( strlen( p_region_in->psz_html ), sizeof( UniChar ) );
                if( psz_text )
                {
                    uint32_t k;

                    ProcessNodes( p_filter, p_xml_reader, p_region_in->p_style, psz_text,
                                  &i_len, &i_runs, &pi_run_lengths, &pp_styles );

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

                    RenderYUVA( p_filter, p_region_out, psz_text, i_len, i_runs, pi_run_lengths, pp_styles);

                    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;
    
    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;
            }
            else if( i_text_align != SUBPICTURE_ALIGN_LEFT ) 
            {
                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;

            // Set up black outlining of the text -- 
            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;

                    // Set the outlining for this line to be dependant on the size of the line -
                    // 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;
}

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;

    if( psz_utf16_str != NULL )
    {
911
        int i_text_align = p_region->i_align & 0x3;
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        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 );
    }

    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;
}