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lvgl/src/lv_font/lv_font_fmt_txt.c

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/**
* @file lv_font.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_font.h"
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#include "lv_font_fmt_txt.h"
#include "../lv_misc/lv_log.h"
#include "../lv_misc/lv_utils.h"
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/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
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static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter);
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static int8_t get_kern_value(const lv_font_t * font, uint32_t gid_left, uint32_t gid_right);
//static int32_t lv_font_codeCompare(const void * pRef, const void * pElement);
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/**********************
* STATIC VARIABLES
**********************/
/**********************
* GLOBAL PROTOTYPES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Used as `get_glyph_bitmap` callback in LittelvGL's native font format if the font is uncompressed.
* @param font pointer to font
* @param unicode_letter an unicode letter which bitmap should be get
* @return pointer to the bitmap or NULL if not found
*/
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const uint8_t * lv_font_get_bitmap_fmt_txt(const lv_font_t * font, uint32_t unicode_letter)
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{
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lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
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uint32_t gid = get_glyph_dsc_id(font, unicode_letter);
if(!gid) return false;
const lv_font_fmt_txt_glyph_dsc_t * gdsc = &fdsc->glyph_dsc[gid];
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if(gdsc) return &fdsc->glyph_bitmap[gdsc->bitmap_index];
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/*If not returned earlier then the letter is not found in this font*/
return NULL;
}
/**
* Used as `get_glyph_dsc` callback in LittelvGL's native font format if the font is uncompressed.
* @param font_p pointer to font
* @param dsc_out store the result descriptor here
* @param letter an UNICODE letter code
* @return true: descriptor is successfully loaded into `dsc_out`.
* false: the letter was not found, no data is loaded to `dsc_out`
*/
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bool lv_font_get_glyph_dsc_fmt_txt(const lv_font_t * font, lv_font_glyph_dsc_t * dsc_out, uint32_t unicode_letter, uint32_t unicode_letter_next)
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{
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lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
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uint32_t gid = get_glyph_dsc_id(font, unicode_letter);
if(!gid) return false;
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int8_t kvalue = 0;
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if(fdsc->kern_dsc) {
uint32_t gid_next = get_glyph_dsc_id(font, unicode_letter_next);
if(gid_next) {
kvalue = get_kern_value(font, gid, gid_next);
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}
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}
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/*Put together a glyph dsc*/
const lv_font_fmt_txt_glyph_dsc_t * gdsc = &fdsc->glyph_dsc[gid];
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uint32_t adv_w = gdsc->adv_w + ((int32_t)((int32_t)kvalue * fdsc->kern_scale) >> 4);
adv_w = (adv_w + (1 << 3)) >> 4;
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dsc_out->adv_w = adv_w;
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dsc_out->box_h = gdsc->box_h;
dsc_out->box_w = gdsc->box_w;
dsc_out->ofs_x = gdsc->ofs_x;
dsc_out->ofs_y = gdsc->ofs_y;
dsc_out->bpp = fdsc->bpp;
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return true;
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}
/**********************
* STATIC FUNCTIONS
**********************/
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static uint32_t get_glyph_dsc_id(const lv_font_t * font, uint32_t letter)
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{
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if(letter == '\0') return 0;
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lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
uint16_t i;
for(i = 0; i < fdsc->cmap_num; i++) {
/*Relative code point*/
uint32_t rcp = letter - fdsc->cmaps[i].range_start;
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if(rcp > fdsc->cmaps[i].range_length) continue;
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uint32_t glyph_id = 0;
if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_FORMAT0_TINY) {
glyph_id = fdsc->cmaps[i].glyph_id_start + rcp;
}
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else if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_FORMAT0_FULL) {
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const uint8_t * gid_ofs_8 = fdsc->cmaps[i].glyph_id_ofs_list;
glyph_id = fdsc->cmaps[i].glyph_id_start + gid_ofs_8[rcp];
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}
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else if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_SPARSE_TINY) {
uint32_t u;
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for(u = 0; u < fdsc->cmaps[i].list_length; u++) {
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if(fdsc->cmaps[i].unicode_list[u] == rcp) {
glyph_id = fdsc->cmaps[i].glyph_id_start + u;
}
}
}
else if(fdsc->cmaps[i].type == LV_FONT_FMT_TXT_CMAP_SPARSE_TINY) {
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const uint8_t * gid_ofs_16 = fdsc->cmaps[i].glyph_id_ofs_list;
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uint32_t u;
for(u = 0; u < 50 /*fdsc->cmaps[i].list_length*/; u++) {
if(fdsc->cmaps[i].unicode_list[u] == rcp) {
glyph_id = fdsc->cmaps[i].glyph_id_start + u;
}
glyph_id = fdsc->cmaps[i].glyph_id_start + gid_ofs_16[u];
}
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}
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return glyph_id;
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}
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return 0;
}
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static int8_t get_kern_value(const lv_font_t * font, uint32_t gid_left, uint32_t gid_right)
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{
lv_font_fmt_txt_dsc_t * fdsc = (lv_font_fmt_txt_dsc_t *) font->dsc;
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int8_t value = 0;
uint32_t k;
if(fdsc->kern_classes == 0) {
/*Kern pairs*/
const lv_font_fmt_txt_kern_pair_t * kdsc = fdsc->kern_dsc;
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if(kdsc->glyph_ids_size == 0) {
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const uint8_t * g_ids = kdsc->glyph_ids;
for(k = 0; k < (uint32_t)kdsc->pair_cnt * 2; k += 2) {
if(g_ids[k] == gid_left &&
g_ids[k+1] == gid_right) {
value = kdsc->values[k >> 1];
break;
}
}
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} else if(kdsc->glyph_ids_size == 1) {
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const uint16_t * g_ids = kdsc->glyph_ids;
for(k = 0; k < (uint32_t)kdsc->pair_cnt * 2; k += 2) {
if(g_ids[k] == gid_left &&
g_ids[k+1] == gid_right) {
value = kdsc->values[k >> 1];
break;
}
}
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} else {
/*Invalid value*/
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}
} else {
/*Kern classes*/
const lv_font_fmt_txt_kern_classes_t * kdsc = fdsc->kern_dsc;
uint8_t left_class = kdsc->left_class_mapping[gid_left];
uint8_t right_class = kdsc->left_class_mapping[gid_right];
/* If class = 0, kerning not exist for that glyph
* else got the value form `class_pair_values` 2D array*/
if(left_class > 0 && right_class > 0) {
value = kdsc->class_pair_values[(left_class-1)* kdsc->right_class_cnt + (right_class-1)];
}
}
return value;
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}
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/** Code Comparator.
*
* Compares the value of both input arguments.
*
* @param[in] pRef Pointer to the reference.
* @param[in] pElement Pointer to the element to compare.
*
* @return Result of comparison.
* @retval < 0 Reference is greater than element.
* @retval = 0 Reference is equal to element.
* @retval > 0 Reference is less than element.
*
*/
//static int32_t lv_font_codeCompare(const void * pRef, const void * pElement)
//{
// return (*(uint16_t *)pRef) - (*(uint16_t *)pElement);
//}