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