Create a new subset font with box drawing characters from NimbusMono.

Use this as a fallback font for the U+2500 and U+2600 unicode blocks.

include/mupdf/fitz/font.h

@@ -384,6 +384,7 @@ const unsigned char *fz_lookup_noto_music_font(fz_context *ctx, int *len);
 const unsigned char *fz_lookup_noto_symbol1_font(fz_context *ctx, int *len);
 const unsigned char *fz_lookup_noto_symbol2_font(fz_context *ctx, int *len);
 const unsigned char *fz_lookup_noto_emoji_font(fz_context *ctx, int *len);
+const unsigned char *fz_lookup_noto_boxes_font(fz_context *ctx, int *len);
 
 /**
 	Try to load a fallback font for the

resources/fonts/urw/subset.box

@@ -0,0 +1 @@
+SF100000,SF110000,SF010000,SF030000,SF020000,SF040000,SF080000,SF090000,SF060000,SF070000,SF050000,SF430000,SF240000,SF510000,SF520000,SF390000,SF220000,SF210000,SF250000,SF500000,SF490000,SF380000,SF280000,SF270000,SF260000,SF360000,SF370000,SF420000,SF190000,SF200000,SF230000,SF470000,SF480000,SF410000,SF450000,SF460000,SF400000,SF540000,SF530000,SF440000,upblock,dnblock,block,lfblock,rtblock,ltshade,shadelight,shade,shademedium,dkshade,shadedark,blacksquare,filledbox,H22073,whitesquare,squarewhitewithsmallblack,squarehorizontalfill,squareverticalfill,squareorthogonalcrosshatchfill,squareupperlefttolowerrightfill,squareupperrighttolowerleftfill,squarediagonalcrosshatchfill,H18543,blacksmallsquare,H18551,whitesmallsquare,blackrectangle,filledrect,blackuppointingtriangle,triagup,whiteuppointingtriangle,blackuppointingsmalltriangle,whiteuppointingsmalltriangle,blackrightpointingtriangle,whiterightpointingtriangle,whiterightpointingsmalltriangle,blackrightpointingpointer,triagrt,blackdownpointingtriangle,triagdn,whitedownpointingtriangle,whitedownpointingsmalltriangle,blackleftpointingtriangle,whiteleftpointingtriangle,whiteleftpointingsmalltriangle,blackleftpointingpointer,triaglf,blackdiamond,whitediamond,whitediamondcontainingblacksmalldiamond,fisheye,lozenge,circle,whitecircle,dottedcircle,bullseye,H18533,blackcircle,circlewithlefthalfblack,circlewithrighthalfblack,bulletinverse,invbullet,invcircle,whitecircleinverse,blacklowerrighttriangle,blacklowerlefttriangle,blackupperlefttriangle,blackupperrighttriangle,openbullet,whitebullet,largecircle,blackstar,whitestar,telephoneblack,whitetelephone,pointingindexleftwhite,pointingindexupwhite,pointingindexrightwhite,pointingindexdownwhite,yinyang,smileface,whitesmilingface,blacksmilingface,invsmileface,compass,sun,female,venus,earth,male,mars,spade,spadesuitblack,heartsuitwhite,diamondsuitwhite,club,clubsuitblack,spadesuitwhite,heart,heartsuitblack,diamond,clubsuitwhite,hotsprings,quarternote,musicalnote,eighthnotebeamed,musicalnotedbl,beamedsixteenthnotes,musicflatsign,musicsharpsign,checkmark,onecircleinversesansserif,twocircleinversesansserif,threecircleinversesansserif,fourcircleinversesansserif,fivecircleinversesansserif,sixcircleinversesansserif,sevencircleinversesansserif,eightcircleinversesansserif,ninecircleinversesansserif,arrowrightheavy

resources/fonts/urw/tocff.sh

@@ -4,7 +4,9 @@
 # python3 scripts/makesubset.py -lig scripts/SECS.TXT > resources/fonts/urw/subset.secs
 # python3 scripts/makesubset.py -lig scripts/WGL4.TXT > resources/fonts/urw/subset.wgl
 
-for f in input/Nimbus*.t1
+tx -cff +S +T -b -n -g $(cat subset.box) -A input/NimbusBoxes.t1
+
+for f in input/NimbusMono*.t1 input/NimbusRoman*.t1 input/NimbusSans*.t1
 do
 	tx -cff +S +T -b -n -g $(cat subset.mes) -A $f
 done

scripts/fontdump.nmake

@@ -12,11 +12,19 @@ generated\resources\fonts\sil:
 	mkdir generated\resources\fonts\sil
 generated\resources\fonts\urw:
 	mkdir generated\resources\fonts\urw
+
 generate: generated\resources\fonts\urw\Dingbats.cff.obj generated\resources\fonts\urw\Dingbats.cff.x64.obj
 generated\resources\fonts\urw\Dingbats.cff.obj: resources\fonts\urw\Dingbats.cff generated\resources\fonts\urw bin2coff.exe
 	bin2coff.exe resources\fonts\urw\Dingbats.cff generated\resources\fonts\urw\Dingbats.cff.obj _binary_Dingbats_cff
 generated\resources\fonts\urw\Dingbats.cff.x64.obj: resources\fonts\urw\Dingbats.cff generated\resources\fonts\urw bin2coff.exe
 	bin2coff.exe resources\fonts\urw\Dingbats.cff generated\resources\fonts\urw\Dingbats.cff.x64.obj _binary_Dingbats_cff 64bit
+
+generate: generated\resources\fonts\urw\NimbusBoxes-Regular.cff.obj generated\resources\fonts\urw\NimbusBoxes-Regular.cff.x64.obj
+generated\resources\fonts\urw\NimbusBoxes-Regular.cff.obj: resources\fonts\urw\NimbusBoxes-Regular.cff generated\resources\fonts\urw bin2coff.exe
+	bin2coff.exe resources\fonts\urw\NimbusBoxes-Regular.cff generated\resources\fonts\urw\NimbusBoxes-Regular.cff.obj _binary_NimbusBoxes_Regular_cff
+generated\resources\fonts\urw\NimbusBoxes-Regular.cff.x64.obj: resources\fonts\urw\NimbusBoxes-Regular.cff generated\resources\fonts\urw bin2coff.exe
+	bin2coff.exe resources\fonts\urw\NimbusBoxes-Regular.cff generated\resources\fonts\urw\NimbusBoxes-Regular.cff.x64.obj _binary_NimbusBoxes_Regular_cff 64bit
+
 generate: generated\resources\fonts\urw\NimbusMonoPS-Bold.cff.obj generated\resources\fonts\urw\NimbusMonoPS-Bold.cff.x64.obj
 generated\resources\fonts\urw\NimbusMonoPS-Bold.cff.obj: resources\fonts\urw\NimbusMonoPS-Bold.cff generated\resources\fonts\urw bin2coff.exe
 	bin2coff.exe resources\fonts\urw\NimbusMonoPS-Bold.cff generated\resources\fonts\urw\NimbusMonoPS-Bold.cff.obj _binary_NimbusMonoPS_Bold_cff

source/fitz/font-table.h

@@ -80,6 +80,8 @@ FONT(sil,	CharisSIL_BoldItalic_cff,	"Charis SIL",		ANY_SCRIPT,	FZ_LANG_UNSET,	NO
 #endif
 
 #ifndef TOFU_NOTO
+FONT(urw,	NimbusBoxes_Regular_cff,	"Nimbus Boxes",		ANY_SCRIPT,	FZ_LANG_UNSET,	NO_SUBFONT,	REGULAR)
+
 FONT(noto,	NotoSerif_Regular_otf,	"Noto Serif",	UCDN_SCRIPT_LATIN,	FZ_LANG_UNSET,	NO_SUBFONT,	REGULAR)
 ALIAS(noto,	NotoSerif_Regular_otf,	"Noto Serif",	UCDN_SCRIPT_GREEK,	FZ_LANG_UNSET,	NO_SUBFONT,	REGULAR)
 ALIAS(noto,	NotoSerif_Regular_otf,	"Noto Serif",	UCDN_SCRIPT_CYRILLIC,	FZ_LANG_UNSET,	NO_SUBFONT,	REGULAR)

source/fitz/font.c

@@ -316,7 +316,7 @@ struct fz_font_context
 	fz_font *base14[14];
 	fz_font *cjk[4];
 	struct { fz_font *serif, *sans; } fallback[256];
-	fz_font *symbol1, *symbol2, *math, *music;
+	fz_font *symbol1, *symbol2, *math, *music, *boxes;
 	fz_font *emoji;
 };
 
@@ -630,6 +630,19 @@ static fz_font *fz_load_fallback_emoji_font(fz_context *ctx)
 	return ctx->font->emoji;
 }
 
+static fz_font *fz_load_fallback_boxes_font(fz_context *ctx)
+{
+	const unsigned char *data;
+	int size;
+	if (!ctx->font->boxes)
+	{
+		data = fz_lookup_noto_boxes_font(ctx, &size);
+		if (data)
+			ctx->font->boxes = fz_new_font_from_memory(ctx, NULL, data, size, 0, 0);
+	}
+	return ctx->font->boxes;
+}
+
 static const struct ft_error ft_errors[] =
 {
 #include FT_ERRORS_H
@@ -2119,6 +2132,14 @@ fz_encode_character_with_fallback(fz_context *ctx, fz_font *user_font, int unico
 			return *out_font = font, gid;
 	}
 
+	font = fz_load_fallback_boxes_font(ctx);
+	if (font)
+	{
+		gid = fz_encode_character(ctx, font, unicode);
+		if (gid > 0)
+			return *out_font = font, gid;
+	}
+
 	font = fz_new_base14_font(ctx, "Symbol");
 	if (font)
 	{

source/fitz/noto.c

@@ -348,3 +348,9 @@ fz_lookup_noto_emoji_font(fz_context *ctx, int *size)
 {
 	return search_by_script_lang(size, NULL, MUPDF_SCRIPT_EMOJI, FZ_LANG_UNSET);
 }
+
+const unsigned char *
+fz_lookup_noto_boxes_font(fz_context *ctx, int *size)
+{
+	return search_by_family(size, "Nimbus Boxes", REGULAR);
+}