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diff '--color=auto' -Naur alevt-v1.8.1/alevt.1x.in alevt-v1.8.1-mod/alevt.1x.in
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--- alevt-v1.8.1/alevt.1x.in	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/alevt.1x.in	2023-01-30 10:08:58.742932130 +0100
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@@ -73,6 +73,9 @@
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 .BI \-pid \ pid
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 Specifies the teletext PID if using the DVB interface.
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 .TP
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+.BR \-doublefont / \-df
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+Instructs alevt to use double sized fonts.
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+.TP
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 .B \-\-help
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 Show summary of options.
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 .TP
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diff '--color=auto' -Naur alevt-v1.8.1/exp-gfx.c alevt-v1.8.1-mod/exp-gfx.c
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--- alevt-v1.8.1/exp-gfx.c	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/exp-gfx.c	2023-01-30 10:08:59.141932965 +0100
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@@ -21,7 +21,16 @@
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 	  int sep)
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 {
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   int x,y;
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-  unsigned char* src= (latin1==LATIN1 ? font1_bits : font2_bits);
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+  unsigned char* src = double_font ? 
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+			( (latin1==LATIN1) ? font1_bits : 
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+			  ( (latin1==LATIN2) ? font2_bits : 
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+			  ( (latin1==KOI8) ? font3_bits :
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+			  ( (latin1==GREEK) ? font4_bits : /* fallback */ font1_bits) ) ) ) 
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+			  :
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+			( (latin1==LATIN1) ? font1d_bits : 
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+			  ( (latin1==LATIN2) ? font2d_bits : 
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+			  ( (latin1==KOI8) ? font3d_bits :
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+			  ( (latin1==GREEK) ? font4d_bits : /* fallback */ font1d_bits) ) ) );
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   int dest_x=_x*CW;
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   int dest_y=_y*CH;
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diff '--color=auto' -Naur alevt-v1.8.1/font.c alevt-v1.8.1-mod/font.c
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--- alevt-v1.8.1/font.c	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/font.c	2023-01-30 10:12:05.895323926 +0100
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@@ -4,3 +4,13 @@
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 #include "font3.xbm"
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 #include "font4.xbm"
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+#include "font1d.xbm"
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+#include "font2d.xbm"
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+#include "font3d.xbm"
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+#include "font4d.xbm"
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+
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+int CW;
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+int CH;
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+int double_font = 0;
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+int font_width;
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+int font_height;
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diff '--color=auto' -Naur alevt-v1.8.1/font.h alevt-v1.8.1-mod/font.h
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--- alevt-v1.8.1/font.h	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/font.h	2023-01-30 10:09:00.366935529 +0100
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@@ -1,20 +1,31 @@
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 #ifndef FONT_H
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 #define FONT_H
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-#include "fontsize.h"	/* the #defines from font?.xbm */
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+// #include "fontsize.h"	/* the #defines from font?.xbm */
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-#if font1_width != font2_width || font1_height != font2_height
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-#error different font sizes.
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-#endif
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+//#if font1_width != font2_width || font1_height != font2_height
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+//#error different font sizes.
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+//#endif
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 extern unsigned char font1_bits[];
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 extern unsigned char font2_bits[];
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 extern unsigned char font3_bits[];
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 extern unsigned char font4_bits[];
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-#define font_width	font1_width
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-#define font_height	font1_height
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-#define CW		(font_width/32)        /* pixel width of a character */
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-#define CH		(font_height/8)        /* pixel height of a character */
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+extern unsigned char font1d_bits[];
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+extern unsigned char font2d_bits[];
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+extern unsigned char font3d_bits[];
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+extern unsigned char font4d_bits[];
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+
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+//#define font_width	font1_width
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+//#define font_height	font1_height
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+//#define CW		(font_width/32)        /* pixel width of a character */
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+//#define CH		(font_height/8)        /* pixel height of a character */
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+
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+extern int CW;
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+extern int CH;
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+extern int double_font;
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+extern int font_width;
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+extern int font_height;
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 #endif
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diff '--color=auto' -Naur alevt-v1.8.1/main.c alevt-v1.8.1-mod/main.c
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--- alevt-v1.8.1/main.c	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/main.c	2023-01-30 10:24:51.045929716 +0100
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@@ -49,6 +49,7 @@
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 	    "    -[no]bell\t\t\tenabled\n"
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 	    "    -charset 
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    	    "              iso8859-7>\tlatin-1\n"
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+	    "    -doublefont\n"
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 	    "    -progname <name>\n"
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 	    "    -pid <pid>\n"
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 	    "\n"
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@@ -75,6 +76,12 @@
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     exit(exitval);
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 }
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+/* Double font size related variables */
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+extern int double_font;
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+extern int font_width;
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+extern int font_height;
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+extern int CW;
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+extern int CH;
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 static int
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 arg_pgno(char *p, int *subno)
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@@ -162,6 +169,7 @@
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 	{ "-charset", "-latin", 1 },
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 	{ "-progname", "-pn", 1 },
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 	{ "-pid", "--pid", 1 },
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+	{ "-doublefont", "-df", 0 },
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     };
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     int i;
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@@ -284,6 +292,13 @@
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   	    case 20:    // pid
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 		txtpid = strtoul(arg, NULL, 0);
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 		break;
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+	    case 21:	// Doublefont
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+		double_font = 1;
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+		font_width  = 576;
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+		font_height = 256;
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+		CW = (font_width/32);
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+		CH = (font_height/8);
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+		break;
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 	    case 6:	// parent
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 	    case -1:	// non-option arg
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 		pgno = arg_pgno(arg, &subno;;
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diff '--color=auto' -Naur alevt-v1.8.1/Makefile alevt-v1.8.1-mod/Makefile
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--- alevt-v1.8.1/Makefile	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/Makefile	2023-01-30 10:09:01.423937742 +0100
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@@ -44,9 +44,10 @@
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 alevt-cap: $(COBJS)
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 	$(CC) $(OPT) $(COBJS) -o alevt-cap $(EXPLIBS)
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-font.o: font1.xbm font2.xbm font3.xbm font4.xbm
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-fontsize.h: font1.xbm font2.xbm font3.xbm font4.xbm
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+font.o: font1.xbm font2.xbm font3.xbm font4.xbm font1d.xbm font2d.xbm font3d.xbm font4d.xbm
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+fontsize.h: font1.xbm font2.xbm font3.xbm font4.xbm font1d.xbm font2d.xbm font3d.xbm font4d.xbm
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 	fgrep -h "#define" font1.xbm font2.xbm font3.xbm font4.xbm >fontsize.h
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+	fgrep -h "#define" font1d.xbm font2d.xbm font3d.xbm font4d.xbm >> fontsize.h
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 font1.xbm: bdf2xbm $(FONT)-latin-1.bdf
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 	./bdf2xbm font1 <$(FONT)-latin-1.bdf >font1.xbm
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@@ -60,6 +61,18 @@
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 font4.xbm: bdf2xbm vtxt-iso8859-7.bdf
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 	./bdf2xbm font4 <vtxt-iso8859-7.bdf >font4.xbm
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+font1d.xbm: font1.xbm
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+	/usr/bin/convert -filter Point -resize 200% font1.xbm font1d.xbm
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+
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+font2d.xbm: font2.xbm
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+	/usr/bin/convert -filter Point -resize 200% font2.xbm font2d.xbm
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+
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+font3d.xbm: font3.xbm
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+	/usr/bin/convert -filter Point -resize 200% font3.xbm font3d.xbm
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+
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+font4d.xbm: font4.xbm
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+	/usr/bin/convert -filter Point -resize 200% font4.xbm font4d.xbm
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+
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 bdf2xbm: bdf2xbm.c
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 	$(HOSTCC) bdf2xbm.c -o bdf2xbm
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@@ -73,7 +86,7 @@
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 	sed s/VERSION/$(VER)/g <alevt-cap.1.in >alevt-cap.1
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 clean:
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-	rm -f *.o page*.txt a.out core bdf2xbm font?.xbm fontsize.h Makefile.bak
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+	rm -f *.o page*.txt a.out core bdf2xbm font?.xbm font?d.xbm fontsize.h Makefile.bak
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 	rm -f alevt alevt-date alevt-cap
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 	rm -f alevt.1x alevt-date.1 alevt-cap.1
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 	rm -f contrib/a.out ttext-*.*
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diff '--color=auto' -Naur alevt-v1.8.1/xio.c alevt-v1.8.1-mod/xio.c
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--- alevt-v1.8.1/xio.c	2021-08-20 21:35:44.000000000 +0200
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+++ alevt-v1.8.1-mod/xio.c	2023-01-30 10:09:01.922938787 +0100
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@@ -130,12 +130,22 @@
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     int i;
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     unsigned char *font_bits;
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-    switch(latin1) {
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-        case LATIN1: font_bits=font1_bits; break;
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-        case LATIN2: font_bits=font2_bits; break;
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-        case KOI8: font_bits=font3_bits; break;
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-	case GREEK: font_bits=font4_bits; break;
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-        default: font_bits=font1_bits; break;
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+    if(!double_font) {
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+        switch(latin1) {
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+            case LATIN1: font_bits=font1_bits; break;
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+            case LATIN2: font_bits=font2_bits; break;
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+            case KOI8: font_bits=font3_bits; break;
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+            case GREEK: font_bits=font4_bits; break;
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+            default: font_bits=font1_bits; break;
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+        }
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+    } else {
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+        switch(latin1) {
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+            case LATIN1: font_bits=font1d_bits; break;
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+            case LATIN2: font_bits=font2d_bits; break;
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+            case KOI8: font_bits=font3d_bits; break;
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+            case GREEK: font_bits=font4d_bits; break;
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+            default: font_bits=font1d_bits; break;
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+        }
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     }
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     xio->font[0] = XCreateBitmapFromData(xio->dpy, xio->root,