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annotate nuklear_ui/font.c @ 1934:253c62b7144e

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Allow specifying a default font path at build time
author Michael Pavone <pavone@retrodev.com>
date Sat, 18 Apr 2020 23:07:44 -0700
parents 24508cb54f87
children 3dd9c68472fb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <stdint.h>
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4 #include <string.h>
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5 #include "../util.h"
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6 #include "sfnt.h"
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7
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8 char *default_font_path(void)
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9 {
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10 #ifdef FONT_PATH
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11 FILE *f = fopen(FONT_PATH, "rb");
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12 if (f) {
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13 fclose(f);
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14 return strdup(FONT_PATH);
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15 }
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16 #endif
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17 FILE *fc_pipe = popen("fc-match -f '%{file}'", "r");
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18 if (!fc_pipe) {
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19 return NULL;
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20 }
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21 size_t buf_size = 128;
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22 char *buffer = NULL;
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23 size_t total = 0, read = 0;
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24 do {
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25 total += read;
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26 buf_size *= 2;
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27 buffer = realloc(buffer, buf_size);
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28 if (!buffer) {
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29 return NULL;
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30 }
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31 read = fread(buffer, 1, buf_size - total, fc_pipe);
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32 } while (read == (buf_size - total));
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33 total += read;
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34 buffer[total] = 0;
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35
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36 return buffer;
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37 }
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parents: 1474
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38
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39 uint8_t *default_font(uint32_t *size_out)
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40 {
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41 char *path = default_font_path();
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42 if (!path) {
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43 goto error;
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44 }
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45 FILE *f = fopen(path, "rb");
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46 free(path);
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47 if (!f) {
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48 goto error;
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49 }
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50 long size = file_size(f);
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51 uint8_t *buffer = malloc(size);
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52 if (size != fread(buffer, 1, size, f)) {
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53 fclose(f);
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54 goto error;
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55 }
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56 fclose(f);
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57 sfnt_container *sfnt = load_sfnt(buffer, size);
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58 if (!sfnt) {
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59 free(buffer);
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60 goto error;
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61 }
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62 return sfnt_flatten(sfnt->tables, size_out);
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63 error:
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64 //TODO: try to find a suitable font in /usr/share/fonts as a fallback
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65 return NULL;
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66 }