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