coral / mtk-gst-plugins-bad-debian / 4139fce4b03491ed60ba48654f9a7e53ffc418ea / . / gst / geometrictransform / geometricmath.c

/* | |

* GStreamer | |

* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk> | |

* | |

* Permission is hereby granted, free of charge, to any person obtaining a | |

* copy of this software and associated documentation files (the "Software"), | |

* to deal in the Software without restriction, including without limitation | |

* the rights to use, copy, modify, merge, publish, distribute, sublicense, | |

* and/or sell copies of the Software, and to permit persons to whom the | |

* Software is furnished to do so, subject to the following conditions: | |

* | |

* The above copyright notice and this permission notice shall be included in | |

* all copies or substantial portions of the Software. | |

* | |

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |

* DEALINGS IN THE SOFTWARE. | |

* | |

* Alternatively, the contents of this file may be used under the | |

* GNU Lesser General Public License Version 2.1 (the "LGPL"), in | |

* which case the following provisions apply instead of the ones | |

* mentioned above: | |

* | |

* This library is free software; you can redistribute it and/or | |

* modify it under the terms of the GNU Library General Public | |

* License as published by the Free Software Foundation; either | |

* version 2 of the License, or (at your option) any later version. | |

* | |

* This library is distributed in the hope that it will be useful, | |

* but WITHOUT ANY WARRANTY; without even the implied warranty of | |

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |

* Library General Public License for more details. | |

* | |

* You should have received a copy of the GNU Library General Public | |

* License along with this library; if not, write to the | |

* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, | |

* Boston, MA 02110-1301, USA. | |

*/ | |

/* | |

* Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java | |

* image editor and filters. The algorithms here were extracted from | |

* his code. | |

*/ | |

#include "geometricmath.h" | |

#include <math.h> | |

#define N 0x1000 | |

#define B 0x100 | |

#define BM 0xff | |

struct _Noise | |

{ | |

gdouble p[2 * B + 2]; | |

gdouble g2[2 * B + 2][2]; | |

}; | |

static void | |

normalize_2 (gdouble * v) | |

{ | |

gdouble s = sqrt (v[0] * v[0] + v[1] * v[1]); | |

v[0] = v[0] / s; | |

v[1] = v[1] / s; | |

} | |

Noise * | |

noise_new (void) | |

{ | |

Noise *noise = g_new0 (Noise, 1); | |

gint i, j, k; | |

for (i = 0; i < B; i++) { | |

noise->p[i] = i; | |

for (j = 0; j < 2; j++) { | |

noise->g2[i][j] = ((g_random_int () % (2 * B)) | |

- B) / (gdouble) B; | |

} | |

normalize_2 (noise->g2[i]); | |

} | |

for (i = B - 1; i >= 0; i--) { | |

k = noise->p[i]; | |

j = g_random_int () % B; | |

noise->p[i] = noise->p[j]; | |

noise->p[j] = k; | |

} | |

for (i = 0; i < B + 2; i++) { | |

noise->p[B + i] = noise->p[i]; | |

for (j = 0; j < 2; j++) { | |

noise->g2[B + i][j] = noise->g2[i][j]; | |

} | |

} | |

return noise; | |

} | |

void | |

noise_free (Noise * noise) | |

{ | |

g_free (noise); | |

} | |

static gdouble | |

s_curve (gdouble x) | |

{ | |

return x * x * (3.0 - 2.0 * x); | |

} | |

static gdouble | |

lerp (gdouble t, gdouble a, gdouble b) | |

{ | |

return a + t * (b - a); | |

} | |

gdouble | |

noise_2 (Noise * noise, gdouble x, gdouble y) | |

{ | |

gint bx0, bx1, by0, by1, b00, b10, b01, b11; | |

gdouble rx0, rx1, ry0, ry1, sx, sy, a, b, t, u, v; | |

gdouble *q; | |

gint i, j; | |

t = x + N; | |

bx0 = ((gint) t) & BM; | |

bx1 = (bx0 + 1) & BM; | |

rx0 = t - (gint) t; | |

rx1 = rx0 - 1.0; | |

t = y + N; | |

by0 = ((gint) t) & BM; | |

by1 = (by0 + 1) & BM; | |

ry0 = t - (gint) t; | |

ry1 = ry0 - 1.0; | |

i = noise->p[bx0]; | |

j = noise->p[bx1]; | |

b00 = noise->p[i + by0]; | |

b10 = noise->p[j + by0]; | |

b01 = noise->p[i + by1]; | |

b11 = noise->p[j + by1]; | |

sx = s_curve (rx0); | |

sy = s_curve (ry0); | |

q = noise->g2[b00]; | |

u = rx0 * q[0] + ry0 * q[1]; | |

q = noise->g2[b10]; | |

v = rx1 * q[0] + ry0 * q[1]; | |

a = lerp (sx, u, v); | |

q = noise->g2[b01]; | |

u = rx0 * q[0] + ry1 * q[1]; | |

q = noise->g2[b11]; | |

v = rx1 * q[0] + ry1 * q[1]; | |

b = lerp (sx, u, v); | |

return 1.5 * lerp (sy, a, b); | |

} | |

/* | |

* This differs from the % operator with respect to negative numbers | |

*/ | |

gdouble | |

mod_float (gdouble a, gdouble b) | |

{ | |

gint n = (gint) (a / b); | |

a -= n * b; | |

if (a < 0) | |

return a + b; | |

return a; | |

} | |

/** | |

* Returns a repeating triangle shape in the range 0..1 with wavelength 1.0 | |

*/ | |

gdouble | |

geometric_math_triangle (gdouble x) | |

{ | |

gdouble r = mod_float (x, 1.0); | |

return 2.0 * (r < 0.5 ? r : 1 - r); | |

} | |

/** | |

* Hermite interpolation | |

*/ | |

gdouble | |

smoothstep (gdouble edge0, gdouble edge1, gdouble x) | |

{ | |

gdouble t = CLAMP ((x - edge0) / (edge1 - edge0), 0.0, 1.0); | |

return t * t * (3.0 - 2.0 * t); | |

} |