win32text.c 15.6 KB
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/*****************************************************************************
 * win32text.c : Text drawing routines using the TextOut win32 API
 *****************************************************************************
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 * Copyright (C) 2002 - 2005 the VideoLAN team
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 * $Id$
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 *
 * Authors: Gildas Bazin <gbazin@videolan.org>
 *
 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_vout.h>
#include <vlc_osd.h>
#include <vlc_block.h>
#include <vlc_filter.h>
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#include <math.h>

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

/* The RenderText call maps to pf_render_string, defined in vlc_filter.h */
static int RenderText( filter_t *, subpicture_region_t *,
                       subpicture_region_t * );

static int Render( filter_t *, subpicture_region_t *, uint8_t *, int, int);
static int SetFont( filter_t *, int );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define FONT_TEXT N_("Font")
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#define FONT_LONGTEXT N_("Filename for the font you want to use")
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#define FONTSIZE_TEXT N_("Font size in pixels")
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#define FONTSIZE_LONGTEXT N_("This is the default size of the fonts " \
     "that will be rendered on the video. " \
     "If set to something different than 0 this option will override the " \
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     "relative font size." )
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#define OPACITY_TEXT N_("Opacity")
#define OPACITY_LONGTEXT N_("The opacity (inverse of transparency) of the " \
     "text that will be rendered on the video. 0 = transparent, " \
     "255 = totally opaque. " )
#define COLOR_TEXT N_("Text default color")
#define COLOR_LONGTEXT N_("The color of the text that will be rendered on "\
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  "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" )
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#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." )
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static int const pi_sizes[] = { 20, 18, 16, 12, 6 };
static char *const ppsz_sizes_text[] = {
    N_("Smaller"), N_("Small"), N_("Normal"), N_("Large"), N_("Larger") };
static const int pi_color_values[] = {
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  0x00000000, 0x00808080, 0x00C0C0C0, 0x00FFFFFF, 0x00800000,
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  0x00FF0000, 0x00FF00FF, 0x00FFFF00, 0x00808000, 0x00008000, 0x00008080,
  0x0000FF00, 0x00800080, 0x00000080, 0x000000FF, 0x0000FFFF };
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static const char *const ppsz_color_descriptions[] = {
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  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") };

vlc_module_begin();
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    set_shortname( N_("Text renderer"));
    set_description( N_("Win32 font renderer") );
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    set_category( CAT_VIDEO );
    set_subcategory( SUBCAT_VIDEO_SUBPIC );

    add_integer( "win32text-fontsize", 0, NULL, FONTSIZE_TEXT,
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                 FONTSIZE_LONGTEXT, true );
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    /* opacity valid on 0..255, with default 255 = fully opaque */
    add_integer_with_range( "win32-opacity", 255, 0, 255, NULL,
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        OPACITY_TEXT, OPACITY_LONGTEXT, false );
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    /* hook to the color values list, with default 0x00ffffff = white */
    add_integer( "win32text-color", 0x00FFFFFF, NULL, COLOR_TEXT,
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                 COLOR_LONGTEXT, true );
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        change_integer_list( pi_color_values, ppsz_color_descriptions, NULL );
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    add_integer( "win32text-rel-fontsize", 16, NULL, FONTSIZER_TEXT,
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                 FONTSIZER_LONGTEXT, false );
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        change_integer_list( pi_sizes, ppsz_sizes_text, NULL );
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    set_capability( "text renderer", 50 );
    add_shortcut( "text" );
    set_callbacks( Create, Destroy );
vlc_module_end();

/*****************************************************************************
 * filter_sys_t: win32text local data
 *****************************************************************************/
struct filter_sys_t
{
    uint8_t        i_font_opacity;
    int            i_font_color;
    int            i_font_size;

    int            i_default_font_size;
    int            i_display_height;

    HDC hcdc;
    HFONT hfont;
    HFONT hfont_bak;
    int i_logpy;
};

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static const uint8_t pi_gamma[16] =
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  {0x00, 0x41, 0x52, 0x63, 0x84, 0x85, 0x96, 0xa7, 0xb8, 0xc9,
   0xca, 0xdb, 0xdc, 0xed, 0xee, 0xff};

/*****************************************************************************
 * Create: creates the module
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t *)p_this;
    filter_sys_t *p_sys;
    char *psz_fontfile = NULL;
    vlc_value_t val;
    HDC hdc;

    /* Allocate structure */
    p_filter->p_sys = p_sys = malloc( sizeof( filter_sys_t ) );
    if( !p_sys )
        return VLC_ENOMEM;
    p_sys->i_font_size = 0;
    p_sys->i_display_height = 0;

    var_Create( p_filter, "win32text-font",
                VLC_VAR_STRING | VLC_VAR_DOINHERIT );
    var_Create( p_filter, "win32text-fontsize",
                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_filter, "win32text-rel-fontsize",
                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Create( p_filter, "win32text-opacity",
                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_filter, "win32text-opacity", &val );
    p_sys->i_font_opacity = __MAX( __MIN( val.i_int, 255 ), 0 );
    var_Create( p_filter, "win32text-color",
                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_filter, "win32text-color", &val );
    p_sys->i_font_color = __MAX( __MIN( val.i_int, 0xFFFFFF ), 0 );

    p_sys->hfont = p_sys->hfont_bak = 0;
    hdc = GetDC( NULL );
    p_sys->hcdc = CreateCompatibleDC( hdc );
    p_sys->i_logpy = GetDeviceCaps( hdc, LOGPIXELSY );
    ReleaseDC( NULL, hdc );
    SetBkMode( p_sys->hcdc, TRANSPARENT );

    var_Get( p_filter, "win32text-fontsize", &val );
    p_sys->i_default_font_size = val.i_int;
    if( SetFont( p_filter, 0 ) != VLC_SUCCESS ) goto error;

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    free( psz_fontfile );
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    p_filter->pf_render_text = RenderText;
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    p_filter->pf_render_html = NULL;
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    return VLC_SUCCESS;

 error:
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    free( psz_fontfile );
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    free( p_sys );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Destroy: destroy the module
 *****************************************************************************/
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;

    if( p_sys->hfont_bak ) SelectObject( p_sys->hcdc, p_sys->hfont_bak );
    if( p_sys->hfont ) DeleteObject( p_sys->hfont );
    DeleteDC( p_sys->hcdc );
    free( p_sys );
}

/*****************************************************************************
 * Render: place string in picture
 *****************************************************************************
 * This function merges the previously rendered win32text glyphs into a picture
 *****************************************************************************/
static int Render( filter_t *p_filter, subpicture_region_t *p_region,
                   uint8_t *p_bitmap, int i_width, int i_height )
{
    uint8_t *p_dst;
    video_format_t fmt;
    int i, i_pitch;
    subpicture_region_t *p_region_tmp;
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    bool b_outline = true;
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    /* Create a new subpicture region */
    memset( &fmt, 0, sizeof(video_format_t) );
    fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
    fmt.i_width = fmt.i_visible_width = i_width + (b_outline ? 4 : 0);
    fmt.i_height = fmt.i_visible_height = i_height + (b_outline ? 4 : 0);
    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;
    }

    /* Build palette */
    fmt.p_palette->i_entries = 16;
    for( i = 0; i < fmt.p_palette->i_entries; i++ )
    {
        fmt.p_palette->palette[i][0] = pi_gamma[i];
        fmt.p_palette->palette[i][1] = 128;
        fmt.p_palette->palette[i][2] = 128;
        fmt.p_palette->palette[i][3] = pi_gamma[i];
    }

    p_region->fmt = p_region_tmp->fmt;
    p_region->picture = p_region_tmp->picture;
    free( p_region_tmp );

    p_dst = p_region->picture.Y_PIXELS;
    i_pitch = p_region->picture.Y_PITCH;

    if( b_outline )
    {
        memset( p_dst, 0, i_pitch * fmt.i_height );
        p_dst += p_region->picture.Y_PITCH * 2 + 2;
    }

    for( i = 0; i < i_height; i++ )
    {
        memcpy( p_dst, p_bitmap, i_width );
        p_bitmap += (i_width+3) & ~3;
        p_dst += i_pitch;
    }

    /* Outlining (find something better than nearest neighbour filtering ?) */
    if( b_outline )
    {
        uint8_t *p_top = p_dst; /* Use 1st line as a cache */
        uint8_t left, current;
        int x, y;

        p_dst = p_region->picture.Y_PIXELS;

        for( y = 1; y < (int)fmt.i_height - 1; y++ )
        {
            memcpy( p_top, p_dst, fmt.i_width );
            p_dst += i_pitch;
            left = 0;

            for( x = 1; x < (int)fmt.i_width - 1; x++ )
            {
                current = p_dst[x];
                p_dst[x] = ( 4 * (int)p_dst[x] + left + p_top[x] + p_dst[x+1] +
                             p_dst[x + i_pitch]) / 8;
                left = current;
            }
        }
        memset( p_top, 0, fmt.i_width );
    }

    return VLC_SUCCESS;
}

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;
    int i_font_color, i_font_alpha, i_font_size;
    uint8_t *p_bitmap;
    TCHAR *psz_string;
    int i, i_width, i_height;
    HBITMAP bitmap, bitmap_bak;
    BITMAPINFO *p_bmi;
    RECT rect = {0};
    SIZE size;

    /* Sanity check */
    if( !p_region_in || !p_region_out ) return VLC_EGENERIC;
#ifdef UNICODE
    psz_string = malloc( (strlen( p_region_in->psz_text )+1) * sizeof(TCHAR) );
    if( mbstowcs( psz_string, p_region_in->psz_text,
                  strlen( p_region_in->psz_text ) * sizeof(TCHAR) ) < 0 )
    {
        free( psz_string );
        return VLC_EGENERIC;
    }
#else
    psz_string = strdup( p_region_in->psz_text );
#endif
    if( !psz_string || !*psz_string ) return VLC_EGENERIC;

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    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;
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        i_font_size = p_sys->i_default_font_size;
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    }
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    SetFont( p_filter, i_font_size );

    SetTextColor( p_sys->hcdc, RGB( (i_font_color >> 16) & 0xff,
                  (i_font_color >> 8) & 0xff, i_font_color & 0xff) );

    GetTextExtentExPoint( p_sys->hcdc, psz_string, _tcslen(psz_string),
                          0, 0, 0, &size );
    i_width = rect.right = size.cx; i_height = rect.bottom = size.cy;

    p_bmi = malloc(sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD)*16);
    memset( p_bmi, 0, sizeof(BITMAPINFOHEADER) );
    p_bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    p_bmi->bmiHeader.biWidth = (i_width+3) & ~3;
    p_bmi->bmiHeader.biHeight = - i_height;
    p_bmi->bmiHeader.biPlanes = 1;
    p_bmi->bmiHeader.biBitCount = 8;
    p_bmi->bmiHeader.biCompression = BI_RGB;
    p_bmi->bmiHeader.biClrUsed = 16;

    for( i = 0; i < 16; i++ )
    {
        p_bmi->bmiColors[i].rgbBlue =
            p_bmi->bmiColors[i].rgbGreen =
                p_bmi->bmiColors[i].rgbRed = pi_gamma[i];
    }

    bitmap = CreateDIBSection( p_sys->hcdc, p_bmi, DIB_RGB_COLORS,
                               (void **)&p_bitmap, NULL, 0 );
    if( !bitmap )
    {
        msg_Err( p_filter, "could not create bitmap" );
        return VLC_EGENERIC;
    }

    bitmap_bak = SelectObject( p_sys->hcdc, bitmap );
    FillRect( p_sys->hcdc, &rect, (HBRUSH)GetStockObject(BLACK_BRUSH) );

    //TextOut( p_sys->hcdc, 0, 0, psz_string, strlen(psz_string) );
    if( !DrawText( p_sys->hcdc, psz_string, -1, &rect, 0 ) )
    {
        msg_Err( p_filter, "could not draw text" );
    }

    p_region_out->i_x = p_region_in->i_x;
    p_region_out->i_y = p_region_in->i_y;
    Render( p_filter, p_region_out, p_bitmap, i_width, i_height );

    SelectObject( p_sys->hcdc, bitmap_bak );
    DeleteObject( bitmap );
    return VLC_SUCCESS;
}

static int SetFont( filter_t *p_filter, int i_size )
{
    filter_sys_t *p_sys = p_filter->p_sys;
    LOGFONT logfont;

    if( i_size && i_size == p_sys->i_font_size ) return VLC_SUCCESS;

    if( !i_size )
    {
        vlc_value_t val;

        if( !p_sys->i_default_font_size &&
            p_sys->i_display_height == (int)p_filter->fmt_out.video.i_height )
            return VLC_SUCCESS;

        if( p_sys->i_default_font_size )
        {
            i_size = p_sys->i_default_font_size;
        }
        else
        {
            var_Get( p_filter, "win32text-rel-fontsize", &val );
            i_size = (int)p_filter->fmt_out.video.i_height / val.i_int;
            p_filter->p_sys->i_display_height =
                p_filter->fmt_out.video.i_height;
        }
        if( i_size <= 0 )
        {
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            msg_Warn( p_filter, "invalid fontsize, using 12" );
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            i_size = 12;
        }

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        msg_Dbg( p_filter, "using fontsize: %i", i_size );
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    }

    p_sys->i_font_size = i_size;

    if( p_sys->hfont_bak ) SelectObject( p_sys->hcdc, p_sys->hfont_bak );
    if( p_sys->hfont ) DeleteObject( p_sys->hfont );

    i_size = i_size * (int64_t)p_sys->i_logpy / 72;

    logfont.lfHeight = i_size;
    logfont.lfWidth = 0;
    logfont.lfEscapement = 0;
    logfont.lfOrientation = 0;
    logfont.lfWeight = 0;
    logfont.lfItalic = FALSE;
    logfont.lfUnderline = FALSE;
    logfont.lfStrikeOut = FALSE;
    logfont.lfCharSet = ANSI_CHARSET;
    logfont.lfOutPrecision = OUT_DEFAULT_PRECIS;
    logfont.lfClipPrecision = CLIP_DEFAULT_PRECIS;
    logfont.lfQuality = ANTIALIASED_QUALITY;
    logfont.lfPitchAndFamily = DEFAULT_PITCH;
    memcpy( logfont.lfFaceName, _T("Arial"), sizeof(_T("Arial")) );

    p_sys->hfont = CreateFontIndirect( &logfont );

    p_sys->hfont_bak = SelectObject( p_sys->hcdc, p_sys->hfont );

    return VLC_SUCCESS;
}