1 files changed, 60 insertions, 0 deletions
diff --git a/fmdsp/font.h b/fmdsp/font.h
new file mode 100644
index 0000000..689df04
--- /dev/null
+++ b/fmdsp/font.h
@@ -0,0 +1,60 @@
+#ifndef MYON_FMDSP_FONT_H_INCLUDED
+#define MYON_FMDSP_FONT_H_INCLUDED
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline bool sjis_is_mb_start(uint8_t c) {
+  if (0x81 <= c && c <= 0x9f) return true;
+  if (0xe0 <= c && c <= 0xef) return true;
+  return false;
+}
+
+static inline bool jis_is_halfwidth(uint16_t jis) {
+  return (jis>>8) == 0x29;
+}
+
+static inline uint16_t sjis2jis(uint8_t sjis_1st, uint8_t sjis_2nd) {
+  uint16_t jis;
+  if (sjis_1st >= 0xe0) sjis_1st -= 0x40;
+  sjis_1st -= 0x81;
+  jis = sjis_1st << 9;
+  if (sjis_2nd >= 0x80) sjis_2nd--;
+  if (sjis_2nd >= 0x9e) {
+    jis |= 0x100 | (sjis_2nd - 0x9e);
+  } else {
+    jis |= (sjis_2nd - 0x40);
+  }
+  jis += 0x2121;
+  return jis;
+}
+
+enum fmdsp_font_type {
+  FMDSP_FONT_ANK,
+  FMDSP_FONT_JIS_LEFT,
+  FMDSP_FONT_JIS_RIGHT
+};
+
+struct fmdsp_font {
+  const void *(* get)(const struct fmdsp_font *font, 
+                uint16_t addr, enum fmdsp_font_type type);
+  const void *data;
+  uint8_t width_half;
+  uint8_t height;
+};
+
+enum {
+  FONT_ROM_FILESIZE = 0x46800
+};
+
+void fmdsp_font_from_font_rom(struct fmdsp_font *font, const void *data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MYON_FMDSP_FONT_H_INCLUDED