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blind-square-gradient.c - blind - suckless command-line video editing utility |
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git clone git://git.suckless.org/blind |
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blind-square-gradient.c (2330B) |
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1 /* See LICENSE file for copyright and license details. */ |
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2 #ifndef TYPE |
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3 #include "common.h" |
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4 |
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5 USAGE("-w width -h height") |
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6 |
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7 static size_t width = 0; |
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8 static size_t height = 0; |
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9 static int with_multiplier; |
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10 |
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11 #define FILE "blind-square-gradient.c" |
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12 #include "define-functions.h" |
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13 |
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14 int |
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15 main(int argc, char *argv[]) |
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16 { |
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17 struct stream stream; |
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18 void (*process)(struct stream *stream); |
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19 |
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20 ARGBEGIN { |
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21 case 'w': |
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22 width = etozu_flag('w', UARGF(), 1, SIZE_MAX); |
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23 break; |
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24 case 'h': |
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25 height = etozu_flag('h', UARGF(), 1, SIZE_MAX); |
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26 break; |
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27 default: |
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28 usage(); |
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29 } ARGEND; |
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30 |
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31 if (!width || !height || argc) |
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32 usage(); |
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33 |
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34 eopen_stream(&stream, NULL); |
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35 |
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36 SELECT_PROCESS_FUNCTION(&stream); |
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37 CHECK_N_CHAN(&stream, 4, 4); |
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38 |
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39 if (stream.width > 3 || stream.height > 3 || |
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40 stream.width * stream.height < 2 || |
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41 stream.width * stream.height > 3) |
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42 eprintf("<stdin>: each frame must contain exactly 2 or 3… |
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43 |
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44 with_multiplier = stream.width * stream.height == 3; |
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45 |
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46 stream.width = width; |
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47 stream.height = height; |
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48 fprint_stream_head(stdout, &stream); |
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49 efflush(stdout, "<stdout>"); |
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50 process(&stream); |
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51 return 0; |
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52 } |
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53 |
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54 #else |
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55 |
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56 static void |
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57 PROCESS(struct stream *stream) |
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58 { |
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59 typedef TYPE pixel_t[4]; |
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60 pixel_t buf[BUFSIZ / sizeof(pixel_t)]; |
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61 TYPE *params, x1, y1, x2, y2, norm, rd = 1; |
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62 TYPE x, y, p, r, rx, ry; |
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63 size_t ix, iy, ptr = 0; |
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64 for (;;) { |
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65 while (stream->ptr < stream->frame_size) { |
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66 if (!eread_stream(stream, stream->frame_size - s… |
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67 ewriteall(STDOUT_FILENO, buf, ptr * size… |
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68 return; |
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69 } |
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70 } |
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71 params = (TYPE *)stream->buf; |
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72 x1 = (params)[0]; |
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73 y1 = (params)[1]; |
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74 x2 = (params)[4]; |
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75 y2 = (params)[5]; |
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76 if (with_multiplier) |
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77 rd = (params)[9]; |
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78 memmove(stream->buf, stream->buf + stream->frame_size, |
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79 stream->ptr -= stream->frame_size); |
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80 |
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81 x2 -= x1; |
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82 y2 -= y1; |
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83 norm = sqrt(x2 * x2 + y2 * y2); |
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84 x2 /= norm; |
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85 y2 /= norm; |
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86 |
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87 for (iy = 0; iy < height; iy++) { |
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88 y = (TYPE)iy - y1; |
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89 for (ix = 0; ix < width; ix++) { |
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90 x = (TYPE)ix - x1; |
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91 p = x * x2 + y * y2; |
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92 rx = x - p * x2; |
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93 ry = y - p * y2; |
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94 r = sqrt(rx * rx + ry * ry) / rd; |
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95 p = abs(p); |
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96 x = MAX(p, r) / norm; |
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97 buf[ptr][0] = buf[ptr][1] = buf[ptr][2] … |
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98 if (++ptr == ELEMENTSOF(buf)) { |
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99 ewriteall(STDOUT_FILENO, buf, si… |
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100 ptr = 0; |
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101 } |
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102 } |
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103 } |
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104 } |
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105 } |
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106 |
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107 #endif |
