147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/**
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* @file lv_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 "lv_font.h"
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#include "../misc/lv_utils.h"
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#include "../misc/lv_log.h"
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#include "../misc/lv_assert.h"
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/*********************
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* DEFINES
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*********************/
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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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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* GLOBAL PROTOTYPES
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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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* Return with the bitmap of a font.
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* @param font_p pointer to a font
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* @param letter a UNICODE character code
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* @return pointer to the bitmap of the letter
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*/
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const uint8_t * lv_font_get_glyph_bitmap(const lv_font_t * font_p, uint32_t letter)
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{
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LV_ASSERT_NULL(font_p);
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return font_p->get_glyph_bitmap(font_p, letter);
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}
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/**
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* Get the descriptor of a glyph
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* @param font_p pointer to font
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* @param dsc_out store the result descriptor here
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* @param letter a UNICODE letter code
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* @param letter_next the next letter after `letter`. Used for kerning
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* @return true: descriptor is successfully loaded into `dsc_out`.
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* false: the letter was not found, no data is loaded to `dsc_out`
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*/
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bool lv_font_get_glyph_dsc(const lv_font_t * font_p, lv_font_glyph_dsc_t * dsc_out, uint32_t letter,
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uint32_t letter_next)
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{
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LV_ASSERT_NULL(font_p);
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LV_ASSERT_NULL(dsc_out);
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#if LV_USE_FONT_PLACEHOLDER
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const lv_font_t * placeholder_font = NULL;
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#endif
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const lv_font_t * f = font_p;
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dsc_out->resolved_font = NULL;
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while(f) {
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bool found = f->get_glyph_dsc(f, dsc_out, letter, letter_next);
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if(found) {
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if(!dsc_out->is_placeholder) {
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dsc_out->resolved_font = f;
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return true;
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}
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#if LV_USE_FONT_PLACEHOLDER
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else if(placeholder_font == NULL) {
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placeholder_font = f;
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}
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#endif
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}
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f = f->fallback;
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}
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#if LV_USE_FONT_PLACEHOLDER
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if(placeholder_font != NULL) {
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placeholder_font->get_glyph_dsc(placeholder_font, dsc_out, letter, letter_next);
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dsc_out->resolved_font = placeholder_font;
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return true;
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}
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#endif
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if(letter < 0x20 ||
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letter == 0xf8ff || /*LV_SYMBOL_DUMMY*/
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letter == 0x200c) { /*ZERO WIDTH NON-JOINER*/
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dsc_out->box_w = 0;
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dsc_out->adv_w = 0;
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}
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else {
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#if LV_USE_FONT_PLACEHOLDER
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dsc_out->box_w = font_p->line_height / 2;
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dsc_out->adv_w = dsc_out->box_w + 2;
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#else
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dsc_out->box_w = 0;
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dsc_out->adv_w = 0;
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#endif
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}
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dsc_out->resolved_font = NULL;
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dsc_out->box_h = font_p->line_height;
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dsc_out->ofs_x = 0;
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dsc_out->ofs_y = 0;
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dsc_out->bpp = 1;
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dsc_out->is_placeholder = true;
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return false;
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}
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/**
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* Get the width of a glyph with kerning
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* @param font pointer to a font
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* @param letter a UNICODE letter
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* @param letter_next the next letter after `letter`. Used for kerning
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* @return the width of the glyph
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*/
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uint16_t lv_font_get_glyph_width(const lv_font_t * font, uint32_t letter, uint32_t letter_next)
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{
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LV_ASSERT_NULL(font);
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lv_font_glyph_dsc_t g;
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lv_font_get_glyph_dsc(font, &g, letter, letter_next);
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return g.adv_w;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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