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ff2braille.c - ff2txt - farbfeld image to plain text visualization |
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git clone git://bitreich.org/ff2txt git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/ff2txt (git://bitreich.org) |
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README |
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--- |
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ff2braille.c (2624B) |
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--- |
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1 /* |
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2 * Transforming an image into a braille character text is transforming a |
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3 * matrice this way: |
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4 * |
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5 * farbfeld image braille characters |
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6 * |
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7 * [[a0 a1 a2 a3 a4 a5] [[[a0 a1 [a2 a3 [a4 a5 \ |
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8 * [b0 b1 b2 b3 b4 b5] b0 b1 / b2 b3 / b4 b5 |<- One braille |
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9 * [c0 c1 c2 c3 c4 c5] c0 c1 / c2 c3 / c4 c5 | character |
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10 * [d0 d1 d2 d3 d4 d5] => d0 d1] d2 d3] d4 d5]] / |
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11 * [e0 e1 e2 e3 e4 e5] [[e0 e1 [e2 e3 [e4 e5 |
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12 * [f0 f1 f2 f3 f4 f5] f0 f1 / f2 f3 / f4 f5 |
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13 * [g0 g1 g2 g3 g4 g5] g0 g1 / g2 g3 / g4 g5 |
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14 * [h0 h1 h2 h3 h4 h5]] h0 h1] h2 h3] h4 h5]]] |
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15 * |
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16 * braille characters written as a line: |
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17 * |
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18 * [[[a0 a1 b0 b1 c0 c1 d0 d1] <- One braille character |
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19 * [a2 a3 b2 b3 c2 c3 d2 d3] |
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20 * [a4 a5 b4 b5 c4 c5 d4 d5]] <- One row of braille characters |
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21 * [[e0 e1 f0 f1 g0 g1 h0 h1] |
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22 * [e2 e3 f2 f3 g2 g3 h2 h3] |
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23 * [e4 e5 f4 f5 g4 g5 h4 h5]]] <- Two row of braille characters |
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24 * |
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25 * Although the encoding of braille keeps 1 4 |
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26 * the characters encoded with only six 2 5 |
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27 * dots first, as only these are used for 3 6 |
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28 * encoding letters: 7 8 |
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29 */ |
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30 |
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31 #include <stdio.h> |
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32 #include <string.h> |
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33 #include <stdlib.h> |
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34 #include <stdint.h> |
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35 |
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36 #include "util.h" |
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37 |
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38 void |
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39 print_utf8_3byte(long rune) |
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40 { |
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41 printf("%c%c%c", |
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42 (char)(0xe0 | (0x0f & (rune >> 12))), /* 1110xxxx */ |
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43 (char)(0x80 | (0x3f & (rune >> 6))), /* 10xxxxxx */ |
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44 (char)(0x80 | (0x3f & (rune)))); /* 10xxxxxx */ |
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45 } |
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46 |
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47 int |
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48 is_on(struct col *rows[4], uint32_t width, uint32_t height, |
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49 uint32_t w, uint32_t h) |
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50 { |
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51 if (w >= width || h >= height) |
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52 return 0; |
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53 |
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54 return col_is_bright(rows[h][w]); |
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55 } |
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56 |
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57 void |
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58 print_4_rows(struct col *rows[4], uint32_t width, uint32_t height) |
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59 { |
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60 uint32_t w; |
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61 |
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62 for (w = 0; w < width; w += 2) |
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63 print_utf8_3byte(BRAILLE_START + |
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64 0x01 * is_on(rows, width, height, w + 0, 0) + |
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65 0x08 * is_on(rows, width, height, w + 1, 0) + |
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66 0x02 * is_on(rows, width, height, w + 0, 1) + |
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67 0x10 * is_on(rows, width, height, w + 1, 1) + |
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68 0x04 * is_on(rows, width, height, w + 0, 2) + |
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69 0x20 * is_on(rows, width, height, w + 1, 2) + |
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70 0x40 * is_on(rows, width, height, w + 0, 3) + |
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71 0x80 * is_on(rows, width, height, w + 1, 3)); |
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72 putchar('\n'); |
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73 } |
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74 |
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75 int |
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76 main(void) |
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77 { |
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78 struct col buf[MAX_WIDTH * 4], *rows[4]; |
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79 uint32_t width, height, h, r, i; |
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80 |
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81 read_header(&width, &height); |
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82 |
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83 for (i = 0; i < 4; i++) |
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84 rows[i] = buf + width * i; |
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85 |
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86 for (h = 0; h < height; h += 4) { |
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87 r = fread(buf, sizeof(*buf), width * 4, stdin); |
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88 if (r % width != 0) |
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89 err("invalid line width"); |
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90 if (ferror(stdin)) |
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91 err("fread stdin"); |
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92 print_4_rows(rows, width, r / width); |
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93 } |
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94 |
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95 return 0; |
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96 } |
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