badge/ui/font.c

   1 #include "font.h"
   2 #include "sprite.h"
   3
   4 #include <drivers/fatfs/ff.h>
   5
   6 static uint8_t badge_framebuffer_render_char_with_fd(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char c, FIL *fd) {
   7   UINT readbytes;
   8   uint8_t buffer[BADGE_FONT_WIDTH];
   9
  10   if(c == 32) {
  11     // intentionally left empty.
  12   } else if(c >= 32 &&
  13      FR_OK == f_lseek(fd, (c - 33) * BADGE_FONT_WIDTH) &&
  14      FR_OK == f_read(fd, buffer, sizeof(buffer), &readbytes)) {
  15     badge_sprite sp = { BADGE_FONT_WIDTH, BADGE_FONT_HEIGHT, buffer };
  16     badge_framebuffer_blt(fb, pos_x, pos_y, &sp, 0);
  17   } else {
  18     return -1;
  19   }
  20
  21   return 0;
  22 }
  23
  24 static FRESULT open_font_file(FIL *fd) {
  25   return f_open(fd, "font.dat", FA_OPEN_EXISTING | FA_READ);
  26 }
  27
  28 uint8_t badge_framebuffer_render_char(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char c) {
  29   FIL fd;
  30
  31   if(FR_OK == open_font_file(&fd)) {
  32     badge_framebuffer_render_char_with_fd(fb, pos_x, pos_y, c, &fd);
  33     f_close(&fd);
  34     return 0;
  35   }
  36
  37   return -1;
  38 }
  39
  40 uint8_t badge_framebuffer_render_text(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char const *text) {
  41   uint8_t count = 0;
  42   FIL fd;
  43
  44   if(FR_OK == open_font_file(&fd)) {
  45     while(*text) {
  46       if(0 != badge_framebuffer_render_char_with_fd(fb, pos_x, pos_y, *text, &fd)) {
  47         break;
  48       }
  49
  50       ++count;
  51       ++text;
  52       pos_x += BADGE_FONT_WIDTH;
  53     }
  54
  55     f_close(&fd);
  56   }
  57
  58   return count;
  59 }
  60
  61 static uint8_t badge_framebuffer_render_number_with_fd(badge_framebuffer *fb, int8_t *pos_x, int8_t pos_y, uint8_t number, FIL *fd) {
  62   if(number > 10) {
  63     badge_framebuffer_render_number_with_fd(fb, pos_x, pos_y, number / 10, fd);
  64   }
  65
  66   uint8_t err = badge_framebuffer_render_char_with_fd(fb, *pos_x, pos_y, '0' + number % 10, fd);
  67
  68   if(err != 0) return err;
  69
  70   *pos_x += BADGE_FONT_WIDTH;
  71   return 0;
  72 }
  73
  74 uint8_t badge_framebuffer_render_number(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, uint8_t number) {
  75   FIL fd;
  76
  77   if(FR_OK == open_font_file(&fd)) {
  78     uint8_t err = badge_framebuffer_render_number_with_fd(fb, &pos_x, pos_y, number, &fd);
  79
  80     if(err != 0) {
  81       return err;
  82     }
  83   }
  84
  85   return 0;
  86 }