/**
* @file lv_draw_label.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_draw_label.h"
#include "lv_draw_rbasic.h"
#include "../lv_misc/lv_math.h"
/*********************
* DEFINES
*********************/
#define LABEL_RECOLOR_PAR_LENGTH 6
/**********************
* TYPEDEFS
**********************/
enum {
CMD_STATE_WAIT,
CMD_STATE_PAR,
CMD_STATE_IN,
};
typedef uint8_t cmd_state_t;
/**********************
* STATIC PROTOTYPES
**********************/
static uint8_t hex_char_to_num(char hex);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Write a text
* @param coords coordinates of the label
* @param mask the label will be drawn only in this area
* @param style pointer to a style
* @param opa_scale scale down all opacities by the factor
* @param txt 0 terminated text to write
* @param flag settings for the text from 'txt_flag_t' enum
* @param offset text offset in x and y direction (NULL if unused)
*
*/
void lv_draw_label(const lv_area_t * coords, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale,
const char * txt, lv_txt_flag_t flag, lv_point_t * offset)
{
const lv_font_t * font = style->text.font;
lv_coord_t w;
if((flag & LV_TXT_FLAG_EXPAND) == 0) {
/*Normally use the label's width as width*/
w = lv_area_get_width(coords);
} else {
/*If EXAPND is enabled then not limit the text's width to the object's width*/
lv_point_t p;
lv_txt_get_size(&p, txt, style->text.font, style->text.letter_space, style->text.line_space, LV_COORD_MAX, flag);
w = p.x;
}
lv_coord_t line_height = lv_font_get_height(font) + style->text.line_space;
/*Init variables for the first line*/
lv_coord_t line_width = 0;
lv_point_t pos;
pos.x = coords->x1;
pos.y = coords->y1;
lv_coord_t x_ofs = 0;
lv_coord_t y_ofs = 0;
if(offset != NULL) {
x_ofs = offset->x;
y_ofs = offset->y;
pos.y += y_ofs;
}
uint32_t line_start = 0;
uint32_t line_end = lv_txt_get_next_line(txt, font, style->text.letter_space, w, flag);
/*Go the first visible line*/
while(pos.y + line_height < mask->y1) {
/*Go to next line*/
line_start = line_end;
line_end += lv_txt_get_next_line(&txt[line_start], font, style->text.letter_space, w, flag);
pos.y += line_height;
if(txt[line_start] == '\0') return;
}
/*Align to middle*/
if(flag & LV_TXT_FLAG_CENTER) {
line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
font, style->text.letter_space, flag);
pos.x += (lv_area_get_width(coords) - line_width) / 2;
}
/*Align to the right*/
else if(flag & LV_TXT_FLAG_RIGHT) {
line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
font, style->text.letter_space, flag);
pos.x += lv_area_get_width(coords) - line_width;
}
lv_opa_t opa = opa_scale == LV_OPA_COVER ? style->text.opa : (uint16_t)((uint16_t) style->text.opa * opa_scale) >> 8;
cmd_state_t cmd_state = CMD_STATE_WAIT;
uint32_t i;
uint16_t par_start = 0;
lv_color_t recolor;
lv_coord_t letter_w;
/*Real draw need a background color for higher bpp letter*/
#if LV_VDB_SIZE == 0
lv_rletter_set_background(style->body.main_color);
#endif
/*Write out all lines*/
while(txt[line_start] != '\0') {
if(offset != NULL) {
pos.x += x_ofs;
}
/*Write all letter of a line*/
cmd_state = CMD_STATE_WAIT;
i = line_start;
uint32_t letter;
while(i < line_end) {
letter = lv_txt_encoded_next(txt, &i);
/*Handle the re-color command*/
if((flag & LV_TXT_FLAG_RECOLOR) != 0) {
if(letter == (uint32_t)LV_TXT_COLOR_CMD[0]) {
if(cmd_state == CMD_STATE_WAIT) { /*Start char*/
par_start = i;
cmd_state = CMD_STATE_PAR;
continue;
} else if(cmd_state == CMD_STATE_PAR) { /*Other start char in parameter escaped cmd. char */
cmd_state = CMD_STATE_WAIT;
} else if(cmd_state == CMD_STATE_IN) { /*Command end */
cmd_state = CMD_STATE_WAIT;
continue;
}
}
/*Skip the color parameter and wait the space after it*/
if(cmd_state == CMD_STATE_PAR) {
if(letter == ' ') {
/*Get the parameter*/
if(i - par_start == LABEL_RECOLOR_PAR_LENGTH + 1) {
char buf[LABEL_RECOLOR_PAR_LENGTH + 1];
memcpy(buf, &txt[par_start], LABEL_RECOLOR_PAR_LENGTH);
buf[LABEL_RECOLOR_PAR_LENGTH] = '\0';
int r, g, b;
r = (hex_char_to_num(buf[0]) << 4) + hex_char_to_num(buf[1]);
g = (hex_char_to_num(buf[2]) << 4) + hex_char_to_num(buf[3]);
b = (hex_char_to_num(buf[4]) << 4) + hex_char_to_num(buf[5]);
recolor = LV_COLOR_MAKE(r, g, b);
} else {
recolor.full = style->text.color.full;
}
cmd_state = CMD_STATE_IN; /*After the parameter the text is in the command*/
}
continue;
}
}
lv_color_t color = style->text.color;
if(cmd_state == CMD_STATE_IN) color = recolor;
letter_fp(&pos, mask, font, letter, color, opa);
letter_w = lv_font_get_width(font, letter);
if(letter_w > 0){
pos.x += letter_w + style->text.letter_space;
}
}
/*Go to next line*/
line_start = line_end;
line_end += lv_txt_get_next_line(&txt[line_start], font, style->text.letter_space, w, flag);
pos.x = coords->x1;
/*Align to middle*/
if(flag & LV_TXT_FLAG_CENTER) {
line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
font, style->text.letter_space, flag);
pos.x += (lv_area_get_width(coords) - line_width) / 2;
}
/*Align to the right*/
else if(flag & LV_TXT_FLAG_RIGHT) {
line_width = lv_txt_get_width(&txt[line_start], line_end - line_start,
font, style->text.letter_space, flag);
pos.x += lv_area_get_width(coords) - line_width;
}
/*Go the next line position*/
pos.y += line_height;
if(pos.y > mask->y2) return;
}
}
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Convert a hexadecimal characters to a number (0..15)
* @param hex Pointer to a hexadecimal character (0..9, A..F)
* @return the numerical value of `hex` or 0 on error
*/
static uint8_t hex_char_to_num(char hex)
{
uint8_t result = 0;
if(hex >= '0' && hex <= '9') {
result = hex - '0';
}
else {
if(hex >= 'a') hex -= 'a' - 'A'; /*Convert to upper case*/
switch(hex) {
case 'A':
result = 10;
break;
case 'B':
result = 11;
break;
case 'C':
result = 12;
break;
case 'D':
result = 13;
break;
case 'E':
result = 14;
break;
case 'F':
result = 15;
break;
default:
result = 0;
break;
}
}
return result;
}