quartztext.c

来自「VLC Player Source Code」· C语言 代码 · 共 1,191 行 · 第 1/3 页

                    uint32_t i_string_length;

                    // 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 " );
                    }

                    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 ) );

    return rv;
}

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;

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

    p_sub = stream_MemoryNew( VLC_OBJECT(p_filter),
                              (uint8_t *) p_region_in->psz_html,
                              strlen( p_region_in->psz_html ),
                              true );
    if( p_sub )
    {
        p_xml = xml_Create( p_filter );
        if( p_xml )
        {
            bool b_karaoke = false;

            p_xml_reader = xml_ReaderCreate( p_xml, p_sub );
            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.
                         */
                        var_SetBool( p_filter, "text-rerender", true );
                        b_karaoke = true;
                    }
                    else if( !strcasecmp( "text", psz_node ) )
                    {
                        b_karaoke = false;
                    }
                    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 );
                }
            }

            if( p_xml_reader )
            {
                UniChar    *psz_text;
                int         i_len = 0;
                uint32_t    i_runs = 0;
                uint32_t   *pi_run_lengths = NULL;
                ATSUStyle  *pp_styles = NULL;

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

                    rv = 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;

                    if(( rv == VLC_SUCCESS ) && ( i_len > 0 ))
                    {
                        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 dependent 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 GetFontSize( filter_t *p_filter )
{
    return p_filter->fmt_out.video.i_height / __MAX(1, var_CreateGetInteger( p_filter, "quartztext-rel-fontsize" ));
}

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;
    int i_text_align = p_region->i_align & 0x3;

    if( !psz_utf16_str )
    {
        msg_Err( p_filter, "Invalid argument to RenderYUVA" );
        return VLC_EGENERIC;
    }

    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;
    }

    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;
}