win32text.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:16k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * win32text.c : Text drawing routines using the TextOut win32 API
- *****************************************************************************
- * Copyright (C) 2002 - 2009 the VideoLAN team
- * $Id: 27e12f875d464adaa4b2196c600f9f44d35f6bae $
- *
- * Authors: Gildas Bazin <gbazin@videolan.org>
- * Pierre Ynard
- *
- * 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
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_vout.h>
- #include <vlc_osd.h>
- #include <vlc_block.h>
- #include <vlc_filter.h>
- #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")
- #define FONT_LONGTEXT N_("Filename for the font you want to use")
- #define FONTSIZE_TEXT N_("Font size in pixels")
- #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 "
- "relative font size." )
- #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 "
- "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" )
- #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." )
- 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[] = {
- 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") };
- vlc_module_begin ()
- set_shortname( N_("Text renderer"))
- set_description( N_("Win32 font renderer") )
- set_category( CAT_VIDEO )
- set_subcategory( SUBCAT_VIDEO_SUBPIC )
- add_integer( "win32text-fontsize", 0, NULL, FONTSIZE_TEXT,
- FONTSIZE_LONGTEXT, true )
- /* opacity valid on 0..255, with default 255 = fully opaque */
- add_integer_with_range( "win32-opacity", 255, 0, 255, NULL,
- OPACITY_TEXT, OPACITY_LONGTEXT, false )
- /* hook to the color values list, with default 0x00ffffff = white */
- add_integer( "win32text-color", 0x00FFFFFF, NULL, COLOR_TEXT,
- COLOR_LONGTEXT, true )
- change_integer_list( pi_color_values, ppsz_color_descriptions, NULL );
- add_integer( "win32text-rel-fontsize", 16, NULL, FONTSIZER_TEXT,
- FONTSIZER_LONGTEXT, false )
- change_integer_list( pi_sizes, ppsz_sizes_text, NULL );
- 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;
- };
- static const uint8_t pi_gamma[16] =
- {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;
- free( psz_fontfile );
- p_filter->pf_render_text = RenderText;
- p_filter->pf_render_html = NULL;
- return VLC_SUCCESS;
- error:
- free( psz_fontfile );
- 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;
- bool b_outline = true;
- /* 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;
- /* Build palette */
- fmt.p_palette = calloc( 1, sizeof(*fmt.p_palette) );
- if( !fmt.p_palette )
- return VLC_EGENERIC;
- 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->p_picture = picture_New( fmt.i_chroma, fmt.i_width, fmt.i_height, fmt.i_aspect );
- if( !p_region->p_picture )
- {
- free( fmt.p_palette );
- return VLC_EGENERIC;
- }
- p_region->fmt = fmt;
- p_dst = p_region->p_picture->Y_PIXELS;
- i_pitch = p_region->p_picture->Y_PITCH;
- if( b_outline )
- {
- memset( p_dst, 0, i_pitch * fmt.i_height );
- p_dst += p_region->p_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->p_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, 0, 0, 0 };
- /* Sanity check */
- if( !p_region_in || !p_region_out ) return VLC_EGENERIC;
- if( !p_region_in->psz_text || !*p_region_in->psz_text )
- return VLC_EGENERIC;
- psz_string = malloc( (strlen( p_region_in->psz_text )+1) * sizeof(TCHAR) );
- if( !psz_string )
- return VLC_ENOMEM;
- #ifdef UNICODE
- 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
- strcpy( psz_string, p_region_in->psz_text );
- #endif
- if( !*psz_string )
- {
- free( 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_default_font_size;
- }
- 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) );
- DrawText( p_sys->hcdc, psz_string, -1, &rect,
- DT_CALCRECT | DT_CENTER | DT_NOPREFIX );
- i_width = rect.right; i_height = rect.bottom;
- 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" );
- free( psz_string );
- return VLC_EGENERIC;
- }
- bitmap_bak = SelectObject( p_sys->hcdc, bitmap );
- FillRect( p_sys->hcdc, &rect, (HBRUSH)GetStockObject(BLACK_BRUSH) );
- if( !DrawText( p_sys->hcdc, psz_string, -1, &rect,
- DT_CENTER | DT_NOPREFIX ) )
- {
- 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 );
- free( psz_string );
- 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 )
- {
- msg_Warn( p_filter, "invalid fontsize, using 12" );
- i_size = 12;
- }
- msg_Dbg( p_filter, "using fontsize: %i", i_size );
- }
- 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;
- }