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replace the only sscanf with a custom function (save 30 kB ROM)

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Gabor Kiss-Vamosi
2018-03-04 16:33:59 +01:00
parent 80b181293a
commit 6e94c70fbb
1 changed files with 35 additions and 1 deletions
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36
lv_draw/lv_draw.c
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@@ -62,6 +62,8 @@ static lv_opa_t antialias_get_opa_circ(lv_coord_t seg, lv_coord_t px_id, lv_opa_
#endif
static uint8_t hex_char_to_num(char hex);
#if USE_LV_TRIANGLE != 0
static void point_swap(lv_point_t * p1, lv_point_t * p2);
#endif
@@ -342,7 +344,11 @@ void lv_draw_label(const lv_area_t * coords,const lv_area_t * mask, const lv_sty
memcpy(buf, &txt[par_start], LABEL_RECOLOR_PAR_LENGTH);
buf[LABEL_RECOLOR_PAR_LENGTH] = '\0';
int r,g,b;
sscanf(buf, "%02x%02x%02x", &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]);
// sscanf(buf, "%02x%02x%02x", &r, &g, &b);
recolor = LV_COLOR_MAKE(r, g, b);
} else {
recolor.full = style->text.color.full;
@@ -2043,6 +2049,34 @@ static lv_opa_t antialias_get_opa_circ(lv_coord_t seg, lv_coord_t px_id, lv_opa_
#endif
/**
* 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)
{
if(hex >= '0' && hex <= '9') {
return hex - '0';
}
if(hex >= 'a') hex -= 'a' - 'A'; /*Convert to upper case*/
switch(hex) {
case 'A': return 10;
case 'B': return 11;
case 'C': return 12;
case 'D': return 13;
case 'E': return 14;
case 'F': return 15;
default: return 0;
}
return 0;
}
#if USE_LV_TRIANGLE != 0
/**
* Swap two points