Added UTF8CutFont

With function `UTF8CutFont`, customized ttf font file(usually with
small size) can be generated via gofpdf.

1 files changed, 16 insertions, 0 deletions

diff --git a/utf8fontfile.go b/utf8fontfile.go
index 794bae2..07cf169 100644
--- a/utf8fontfile.go
+++ b/utf8fontfile.go
@@ -1138,3 +1138,19 @@ func keySortArrayRangeMap(s map[int][]int) []int {
 	sort.Ints(keys)
 	return keys
 }
+
+// UTF8CutFont cuts a set in cutset and returns the customized font bytes
+// Parameters:
+// in - the ttf bytes in,
+// cutset - the cutset runes in string,
+// Returns:
+// out - the ttf bytes out,
+func UTF8CutFont(in []byte, cutset string) (out []byte) {
+	f := newUTF8Font(&fileReader{readerPosition: 0, array: in})
+	runes := map[int]int{}
+	for i, r := range cutset {
+		runes[i] = int(r)
+	}
+	out = f.GenerateСutFont(runes)
+	return
+}