libdraw: autoscale fonts when moving between low and high dpi screens

Change-Id: I6093955b222db89dfe437fb723593b173d888d01
Reviewed-on: https://plan9port-review.googlesource.com/1170
Reviewed-by: Russ Cox <rsc@swtch.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/libdraw/buildfont.c b/src/libdraw/buildfont.c
index 0f14022e..512bc9d3 100644
--- a/src/libdraw/buildfont.c
+++ b/src/libdraw/buildfont.c
@@ -138,5 +138,23 @@ freefont(Font *f)
 	free(f->cache);
 	free(f->subf);
 	free(f->sub);
+
+	if(f->ondisplaylist) {
+		f->ondisplaylist = 0;
+		if(f->next)
+			f->next->prev = f->prev;
+		else
+			f->display->lastfont = f->prev;
+		if(f->prev)
+			f->prev->next = f->next;
+		else
+			f->display->firstfont = f->next;
+	}
+
+	if(f->lodpi != f)	
+		freefont(f->lodpi);
+	if(f->hidpi != f)
+		freefont(f->hidpi);
+
 	free(f);
 }