badge/ui/font.c

   1 #include "font.h"
   2 #include "sprite.h"
   3
   4 #ifdef __linux__
   5 #include <stdio.h>
   6 typedef FILE *FIL;
   7 typedef uint8_t FRESULT;
   8 typedef unsigned UINT;
   9 enum { FR_OK = 0 };
  10
  11 void f_close(FIL *fd) { fclose(*fd); *fd = NULL; }
  12 FRESULT f_lseek(FIL *fd, unsigned pos) { return fseek(*fd, pos, SEEK_SET); }
  13 FRESULT f_read(FIL *fd, unsigned char *buffer, size_t buflen, UINT *bytes) {
  14   *bytes = fread(buffer, 1, buflen, *fd);
  15   return *bytes == 0;
  16 }
  17
  18 #else
  19 #include <drivers/fatfs/ff.h>
  20 #endif
  21
  22 static FRESULT open_font_file(FIL *fd) {
  23 #ifdef __linux__
  24   *fd = fopen("../sprites/font.dat", "r");
  25   return fd ? 0 : -1;
  26 #else
  27   return f_open(fd, "/font.dat", FA_OPEN_EXISTING | FA_READ);
  28 #endif
  29 }
  30
  31 static uint8_t badge_framebuffer_render_char_with_fd(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char c, FIL *fd) {
  32   UINT readbytes;
  33   uint8_t buffer[BADGE_FONT_GLYPH_WIDTH];
  34
  35   if(c == 32) {
  36     // intentionally left empty.
  37   } else if(c >= 32 &&
  38      FR_OK == f_lseek(fd, (c - 33) * BADGE_FONT_GLYPH_WIDTH) &&
  39      FR_OK == f_read(fd, buffer, sizeof(buffer), &readbytes)) {
  40     badge_sprite sp = { BADGE_FONT_GLYPH_WIDTH, BADGE_FONT_HEIGHT, buffer };
  41     badge_framebuffer_blt(fb, pos_x, pos_y, &sp, 0);
  42   } else {
  43     return -1;
  44   }
  45
  46   return 0;
  47 }
  48
  49 uint8_t badge_framebuffer_render_char(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char c) {
  50   FIL fd;
  51
  52   if(FR_OK == open_font_file(&fd)) {
  53     badge_framebuffer_render_char_with_fd(fb, pos_x, pos_y, c, &fd);
  54     f_close(&fd);
  55     return 0;
  56   }
  57
  58   return -1;
  59 }
  60
  61 uint8_t badge_framebuffer_render_text(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, char const *text) {
  62   uint8_t count = 0;
  63   FIL fd;
  64
  65   if(FR_OK == open_font_file(&fd)) {
  66     while(*text) {
  67       if(0 != badge_framebuffer_render_char_with_fd(fb, pos_x, pos_y, *text, &fd)) {
  68         break;
  69       }
  70
  71       ++count;
  72       ++text;
  73       pos_x += BADGE_FONT_WIDTH;
  74     }
  75
  76     f_close(&fd);
  77   }
  78
  79   return count;
  80 }
  81
  82 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) {
  83   if(number >= 10) {
  84     badge_framebuffer_render_number_with_fd(fb, pos_x, pos_y, number / 10, fd);
  85   }
  86
  87   uint8_t err = badge_framebuffer_render_char_with_fd(fb, *pos_x, pos_y, '0' + number % 10, fd);
  88
  89   if(err != 0) return err;
  90
  91   *pos_x += BADGE_FONT_WIDTH;
  92   return 0;
  93 }
  94
  95 uint8_t badge_framebuffer_render_number(badge_framebuffer *fb, int8_t pos_x, int8_t pos_y, uint8_t number) {
  96   FIL fd;
  97
  98   if(FR_OK == open_font_file(&fd)) {
  99     uint8_t err = badge_framebuffer_render_number_with_fd(fb, &pos_x, pos_y, number, &fd);
 100
 101     if(err != 0) {
 102       return err;
 103     }
 104   }
 105
 106   return 0;
 107 }