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 uint8_t badge_framebuffer_render_char(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char c) {
  25   FIL fd;
  26
  27   if(FR_OK == f_open(&fd, "font.dat", FA_OPEN_EXISTING | FA_READ)) {
  28     badge_framebuffer_render_char_with_fd(fb, pos_x, pos_y, c, &fd);
  29     f_close(&fd);
  30     return 0;
  31   }
  32
  33   return -1;
  34 }
  35
  36 uint8_t badge_framebuffer_render_text(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char const *text) {
  37   uint8_t count = 0;
  38   FIL fd;
  39
  40   if(FR_OK == f_open(&fd, "font.dat", FA_OPEN_EXISTING | FA_READ)) {
  41     while(*text) {
  42       if(0 != badge_framebuffer_render_char_with_fd(fb, pos_x, pos_y, *text, &fd)) {
  43         break;
  44       }
  45
  46       ++count;
  47       ++text;
  48       pos_x += BADGE_FONT_WIDTH;
  49     }
  50
  51     f_close(&fd);
  52   }
  53
  54   return count;
  55 }