mirror of
https://github.com/lvgl/lvgl.git
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152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/**
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* @file font.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "text.h"
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/*********************
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* DEFINES
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*********************/
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#define TXT_NO_BREAK_FOUND UINT16_MAX
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static bool txt_is_break_char(char letter);
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Get the next line of text. Check line length and break chars too.
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* @param txt a '\0' terminated string
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* @param font_p pointer to a font
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* @param letter_space letter space
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* @param max_l max line length
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* @return the index of the first char of the new line
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*/
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uint16_t txt_get_next_line(const char * txt, const font_t * font_p,
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uint16_t letter_space, cord_t max_l)
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{
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uint32_t i = 0;
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cord_t act_l = 0;
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uint16_t last_break = TXT_NO_BREAK_FOUND;
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while(txt[i] != '\0') {
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/*Check for new line chars*/
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if(txt[i] == '\n' || txt[i] == '\r') {
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/*Handle \n\r and \r\n as well*/
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if(txt[i + 1] == '\n' || txt[i + 1] == '\r') {
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i++;
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}
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return i+1; /*Return with the first letter of the next line*/
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} else { /*Check the actual length*/
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act_l += font_get_width(font_p, txt[i]);
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/*If the txt is too long then finish, this is the line end*/
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if(act_l > max_l) {
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/*If already a break character is found, then break there*/
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if(last_break != TXT_NO_BREAK_FOUND) {
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i = last_break;
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}
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while(txt[i] == ' ') i++;
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return i;
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}
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/*If this char still can fit to this line then check if
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* txt can be broken here later */
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else if(txt_is_break_char(txt[i])) {
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last_break = i;
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last_break++;/*Go to the next char, the break char stays in this line*/
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}
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}
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act_l += letter_space;
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i++;
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}
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return i;
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}
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/**
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* Give the length of a text with a given font
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* @param txt a '\0' terminate string
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* @param char_num number of characters in 'txt'
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* @param font_p pointer to a font
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* @param letter_space letter sapce
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* @return length of a char_num long text
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*/
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cord_t txt_get_length(const char * txt, uint16_t char_num,
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const font_t * font_p, uint16_t letter_space)
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{
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uint16_t i;
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cord_t len = 0;
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if(char_num != 0) {
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for(i = 0; i < char_num; i++) {
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len += font_get_width(font_p, txt[i]);
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len += letter_space;
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}
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/*Trim closing spaces */
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for(i = char_num - 1; i > 0; i--) {
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if(txt[i] == ' ') {
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len -= font_get_width(font_p, txt[i]);
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len -= letter_space;
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} else {
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break;
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}
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}
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/*Correct the last letter space,
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* because thee is no letter space after the last char*/
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len -= letter_space;
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}
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return len;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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/**
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* Test if char is break char or not (a text can broken here or not)
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* @param letter a letter
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* @return false: 'letter' is not break char
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*/
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static bool txt_is_break_char(char letter)
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{
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uint8_t i;
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bool ret = false;
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/*Compare the letter to TXT_BREAK_CHARS*/
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for(i = 0; LV_TXT_BREAK_CHARS[i] != '\0'; i++) {
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if(letter == LV_TXT_BREAK_CHARS[i]) {
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ret = true; /*If match then it is break char*/
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break;
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}
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}
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return ret;
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}
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