[2] | 1 | //======================================================================== |
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| 2 | // |
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| 3 | // SplashScreen.cc |
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| 4 | // |
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| 5 | //======================================================================== |
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| 6 | |
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| 7 | #include <config.h> |
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| 8 | |
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| 9 | #ifdef USE_GCC_PRAGMAS |
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| 10 | #pragma implementation |
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| 11 | #endif |
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| 12 | |
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| 13 | #include <string.h> |
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| 14 | #include "goo/gmem.h" |
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| 15 | #include "SplashMath.h" |
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| 16 | #include "SplashScreen.h" |
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| 17 | |
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| 18 | //------------------------------------------------------------------------ |
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| 19 | // SplashScreen |
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| 20 | //------------------------------------------------------------------------ |
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| 21 | |
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| 22 | // This generates a 45 degree screen using a circular dot spot |
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| 23 | // function. DPI = resolution / ((size / 2) * sqrt(2)). |
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| 24 | // Gamma correction (gamma = 1 / 1.33) is also computed here. |
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| 25 | SplashScreen::SplashScreen(int sizeA) { |
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| 26 | SplashCoord *dist; |
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| 27 | SplashCoord u, v, d, val; |
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| 28 | int size2, x, y, x1, y1, i; |
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| 29 | |
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| 30 | size2 = sizeA >> 1; |
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| 31 | if (size2 < 1) { |
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| 32 | size2 = 1; |
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| 33 | } |
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| 34 | size = size2 << 1; |
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| 35 | |
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| 36 | // initialize the threshold matrix |
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| 37 | mat = (SplashCoord *)gmallocn(size * size, sizeof(SplashCoord)); |
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| 38 | for (y = 0; y < size; ++y) { |
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| 39 | for (x = 0; x < size; ++x) { |
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| 40 | mat[y * size + x] = -1; |
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| 41 | } |
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| 42 | } |
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| 43 | |
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| 44 | // build the distance matrix |
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| 45 | dist = (SplashCoord *)gmallocn(size * size2, sizeof(SplashCoord)); |
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| 46 | for (y = 0; y < size2; ++y) { |
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| 47 | for (x = 0; x < size2; ++x) { |
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| 48 | if (x + y < size2 - 1) { |
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| 49 | u = (SplashCoord)x + 0.5 - 0; |
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| 50 | v = (SplashCoord)y + 0.5 - 0; |
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| 51 | } else { |
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| 52 | u = (SplashCoord)x + 0.5 - (SplashCoord)size2; |
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| 53 | v = (SplashCoord)y + 0.5 - (SplashCoord)size2; |
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| 54 | } |
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| 55 | dist[y * size2 + x] = u*u + v*v; |
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| 56 | } |
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| 57 | } |
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| 58 | for (y = 0; y < size2; ++y) { |
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| 59 | for (x = 0; x < size2; ++x) { |
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| 60 | if (x < y) { |
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| 61 | u = (SplashCoord)x + 0.5 - 0; |
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| 62 | v = (SplashCoord)y + 0.5 - (SplashCoord)size2; |
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| 63 | } else { |
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| 64 | u = (SplashCoord)x + 0.5 - (SplashCoord)size2; |
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| 65 | v = (SplashCoord)y + 0.5 - 0; |
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| 66 | } |
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| 67 | dist[(size2 + y) * size2 + x] = u*u + v*v; |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | // build the threshold matrix |
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| 72 | minVal = 1; |
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| 73 | maxVal = 0; |
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| 74 | x1 = y1 = 0; // make gcc happy |
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| 75 | for (i = 1; i <= size * size2; ++i) { |
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| 76 | d = size * size2; |
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| 77 | for (y = 0; y < size; ++y) { |
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| 78 | for (x = 0; x < size2; ++x) { |
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| 79 | if (mat[y * size + x] < 0 && |
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| 80 | dist[y * size2 + x] < d) { |
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| 81 | x1 = x; |
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| 82 | y1 = y; |
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| 83 | d = dist[y1 * size2 + x1]; |
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| 84 | } |
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| 85 | } |
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| 86 | } |
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| 87 | u = (SplashCoord)1 - (SplashCoord)i / (SplashCoord)(size * size2 + 1); |
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| 88 | val = splashPow(u, 1.33); |
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| 89 | if (val < minVal) { |
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| 90 | minVal = val; |
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| 91 | } |
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| 92 | if (val > maxVal) { |
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| 93 | maxVal = val; |
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| 94 | } |
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| 95 | mat[y1 * size + x1] = val; |
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| 96 | if (y1 < size2) { |
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| 97 | mat[(y1 + size2) * size + x1 + size2] = val; |
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| 98 | } else { |
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| 99 | mat[(y1 - size2) * size + x1 + size2] = val; |
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| 100 | } |
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| 101 | } |
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| 102 | |
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| 103 | gfree(dist); |
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| 104 | } |
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| 105 | |
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| 106 | SplashScreen::SplashScreen(SplashScreen *screen) { |
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| 107 | int n; |
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| 108 | |
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| 109 | size = screen->size; |
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| 110 | n = size * size * sizeof(SplashCoord); |
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| 111 | mat = (SplashCoord *)gmalloc(n); |
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| 112 | memcpy(mat, screen->mat, n); |
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| 113 | minVal = screen->minVal; |
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| 114 | maxVal = screen->maxVal; |
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| 115 | } |
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| 116 | |
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| 117 | SplashScreen::~SplashScreen() { |
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| 118 | gfree(mat); |
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| 119 | } |
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| 120 | |
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| 121 | int SplashScreen::test(int x, int y, SplashCoord value) { |
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| 122 | int xx, yy; |
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| 123 | |
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| 124 | if (value < minVal) { |
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| 125 | return 0; |
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| 126 | } |
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| 127 | if (value >= maxVal) { |
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| 128 | return 1; |
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| 129 | } |
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| 130 | if ((xx = x % size) < 0) { |
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| 131 | xx = -xx; |
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| 132 | } |
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| 133 | if ((yy = y % size) < 0) { |
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| 134 | yy = -yy; |
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| 135 | } |
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| 136 | return value < mat[yy * size + xx] ? 0 : 1; |
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| 137 | } |
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| 138 | |
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| 139 | GBool SplashScreen::isStatic(SplashCoord value) { |
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| 140 | return value < minVal || value >= maxVal; |
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| 141 | } |
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