acid-drop

- Hacking the planet from a LilyGo T-Deck using custom firmware
git clone git://git.acid.vegas/acid-drop.git
lv_font.c (3347B)
      1 /**
      2  * @file lv_font.c
      3  *
      4  */
      5 
      6 /*********************
      7  *      INCLUDES
      8  *********************/
      9 
     10 #include "lv_font.h"
     11 #include "../misc/lv_utils.h"
     12 #include "../misc/lv_log.h"
     13 #include "../misc/lv_assert.h"
     14 
     15 /*********************
     16  *      DEFINES
     17  *********************/
     18 
     19 /**********************
     20  *      TYPEDEFS
     21  **********************/
     22 
     23 /**********************
     24  *  STATIC PROTOTYPES
     25  **********************/
     26 
     27 /**********************
     28  *  STATIC VARIABLES
     29  **********************/
     30 
     31 /**********************
     32  * GLOBAL PROTOTYPES
     33  **********************/
     34 
     35 /**********************
     36  *      MACROS
     37  **********************/
     38 
     39 /**********************
     40  *   GLOBAL FUNCTIONS
     41  **********************/
     42 
     43 /**
     44  * Return with the bitmap of a font.
     45  * @param font_p pointer to a font
     46  * @param letter a UNICODE character code
     47  * @return pointer to the bitmap of the letter
     48  */
     49 const uint8_t * lv_font_get_glyph_bitmap(const lv_font_t * font_p, uint32_t letter)
     50 {
     51     LV_ASSERT_NULL(font_p);
     52     return font_p->get_glyph_bitmap(font_p, letter);
     53 }
     54 
     55 /**
     56  * Get the descriptor of a glyph
     57  * @param font_p pointer to font
     58  * @param dsc_out store the result descriptor here
     59  * @param letter a UNICODE letter code
     60  * @param letter_next the next letter after `letter`. Used for kerning
     61  * @return true: descriptor is successfully loaded into `dsc_out`.
     62  *         false: the letter was not found, no data is loaded to `dsc_out`
     63  */
     64 bool lv_font_get_glyph_dsc(const lv_font_t * font_p, lv_font_glyph_dsc_t * dsc_out, uint32_t letter,
     65                            uint32_t letter_next)
     66 {
     67 
     68     LV_ASSERT_NULL(font_p);
     69     LV_ASSERT_NULL(dsc_out);
     70 
     71     const lv_font_t * placeholder_font = NULL;
     72     const lv_font_t * f = font_p;
     73 
     74     dsc_out->resolved_font = NULL;
     75 
     76     while(f) {
     77         bool found = f->get_glyph_dsc(f, dsc_out, letter, letter_next);
     78         if(found) {
     79             if(!dsc_out->is_placeholder) {
     80                 dsc_out->resolved_font = f;
     81                 return true;
     82             }
     83             else if(placeholder_font == NULL) {
     84                 placeholder_font = f;
     85             }
     86         }
     87         f = f->fallback;
     88     }
     89 
     90     if(placeholder_font != NULL) {
     91         placeholder_font->get_glyph_dsc(placeholder_font, dsc_out, letter, letter_next);
     92         dsc_out->resolved_font = placeholder_font;
     93         return true;
     94     }
     95 
     96 
     97     if(letter < 0x20 ||
     98        letter == 0xf8ff || /*LV_SYMBOL_DUMMY*/
     99        letter == 0x200c) { /*ZERO WIDTH NON-JOINER*/
    100         dsc_out->box_w = 0;
    101         dsc_out->adv_w = 0;
    102     }
    103     else {
    104         dsc_out->box_w = font_p->line_height / 2;
    105         dsc_out->adv_w = dsc_out->box_w + 2;
    106     }
    107 
    108     dsc_out->resolved_font = NULL;
    109     dsc_out->box_h = font_p->line_height;
    110     dsc_out->ofs_x = 0;
    111     dsc_out->ofs_y = 0;
    112     dsc_out->bpp   = 1;
    113     dsc_out->is_placeholder = true;
    114 
    115     return false;
    116 }
    117 
    118 /**
    119  * Get the width of a glyph with kerning
    120  * @param font pointer to a font
    121  * @param letter a UNICODE letter
    122  * @param letter_next the next letter after `letter`. Used for kerning
    123  * @return the width of the glyph
    124  */
    125 uint16_t lv_font_get_glyph_width(const lv_font_t * font, uint32_t letter, uint32_t letter_next)
    126 {
    127     LV_ASSERT_NULL(font);
    128     lv_font_glyph_dsc_t g;
    129     lv_font_get_glyph_dsc(font, &g, letter, letter_next);
    130     return g.adv_w;
    131 }
    132 
    133 /**********************
    134  *   STATIC FUNCTIONS
    135  **********************/