1 files changed, 47 insertions, 0 deletions
diff --git a/Marlin/src/lcd/fontutils.h b/Marlin/src/lcd/fontutils.h
new file mode 100644
index 0000000..04ff811
--- /dev/null
+++ b/Marlin/src/lcd/fontutils.h
@@ -0,0 +1,47 @@
+/**
+ * @file    fontutils.h
+ * @brief   help functions for font and char
+ * @author  Yunhui Fu (yhfudev@gmail.com)
+ * @version 1.0
+ * @date    2016-08-19
+ * @copyright GPL/BSD
+ */
+#pragma once
+
+#include <stdlib.h>
+#include <stddef.h> // wchar_t
+#include <stdint.h> // uint32_t
+
+#include "../HAL/shared/Marduino.h"
+#include "../core/macros.h"
+
+// read a byte from ROM or RAM
+typedef uint8_t (*read_byte_cb_t)(uint8_t * str);
+
+uint8_t read_byte_ram(uint8_t * str);
+uint8_t read_byte_rom(uint8_t * str);
+
+// there's overflow of the wchar_t due to the 2-byte size in Arduino
+// sizeof(wchar_t)=2; sizeof(size_t)=2; sizeof(uint32_t)=4;
+// sizeof(int)=2; sizeof(long)=4; sizeof(unsigned)=2;
+//#undef wchar_t
+#define wchar_t uint32_t
+//typedef uint32_t wchar_t;
+
+typedef uint16_t pixel_len_t;
+#define PIXEL_LEN_NOLIMIT ((pixel_len_t)(-1))
+
+/* Perform binary search */
+typedef int (* pf_bsearch_cb_comp_t)(void *userdata, size_t idx, void * data_pin); /*"data_list[idx] - *data_pin"*/
+int pf_bsearch_r(void *userdata, size_t num_data, pf_bsearch_cb_comp_t cb_comp, void *data_pinpoint, size_t *ret_idx);
+
+/* Get the character, decoding multibyte UTF8 characters and returning a pointer to the start of the next UTF8 character */
+uint8_t* get_utf8_value_cb(uint8_t *pstart, read_byte_cb_t cb_read_byte, wchar_t *pval);
+
+/* Returns length of string in CHARACTERS, NOT BYTES */
+uint8_t utf8_strlen(const char *pstart);
+uint8_t utf8_strlen_P(PGM_P pstart);
+
+/* Returns start byte position of desired char number */
+uint8_t utf8_byte_pos_by_char_num(const char *pstart, const uint8_t charnum);
+uint8_t utf8_byte_pos_by_char_num_P(PGM_P pstart, const uint8_t charnum);