From d46eb009c132b555761b95e6ac3318539dddb20e Mon Sep 17 00:00:00 2001
From: Takamichi Horikawa <takamichiho@gmail.com>
Date: Tue, 31 Jan 2017 23:06:43 +0900
Subject: use multibytetowidechar to convert charset

---
 fmdsp/font.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'fmdsp/font.h')

diff --git a/fmdsp/font.h b/fmdsp/font.h
index 689df04..8c57284 100644
--- a/fmdsp/font.h
+++ b/fmdsp/font.h
@@ -33,6 +33,21 @@ static inline uint16_t sjis2jis(uint8_t sjis_1st, uint8_t sjis_2nd) {
   return jis;
 }
 
+static inline uint16_t jis2sjis(uint16_t jis) {
+  jis += 0x217e;
+  jis ^= 0x4000;
+  bool c = jis&0x100;
+  jis = (jis & 0xff) | (((jis>>1)|0x8000)&0xff00);
+  if (!c) {
+    uint16_t jisl = jis & 0xff;
+    jisl -= 0xde;
+    if (jisl >> 8) jisl--;
+    jisl -= 0x80;
+    jis = (jis&0xff00) | (jisl&0xff);
+  }
+  return jis;
+}
+
 enum fmdsp_font_type {
   FMDSP_FONT_ANK,
   FMDSP_FONT_JIS_LEFT,
-- 
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