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102 lines
2.2 KiB
102 lines
2.2 KiB
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#include <stdlib.h>
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#include <math.h>
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#include "wetpix.h"
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#include "wetphysics.h"
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#include "wetpaint.h"
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/* This function is not entirely satisfactory - the compositing is basically
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opaque, and it really should do wet compositing. */
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void
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wet_dab(WetLayer * layer,
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WetPix * paint,
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double x, double y, double r, double pressure, double strength)
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{
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double r_fringe;
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int x0, y0;
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int x1, y1;
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WetPix *wet_line;
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int xp, yp;
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double xx, yy, rr;
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double eff_height;
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double press, contact;
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WetPixDbl wet_tmp, wet_tmp2;
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r_fringe = r + 1;
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x0 = floor(x - r_fringe);
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y0 = floor(y - r_fringe);
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x1 = ceil(x + r_fringe);
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y1 = ceil(y + r_fringe);
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if (x0 < 0)
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x0 = 0;
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if (y0 < 0)
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y0 = 0;
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if (x1 >= layer->width)
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x1 = layer->width;
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if (y1 >= layer->height)
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y1 = layer->height;
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wet_line = layer->buf + y0 * layer->rowstride;
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for (yp = y0; yp < y1; yp++) {
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yy = (yp + 0.5 - y);
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yy *= yy;
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for (xp = x0; xp < x1; xp++) {
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xx = (xp + 0.5 - x);
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xx *= xx;
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rr = yy + xx;
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if (rr < r * r)
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press = pressure * 0.25;
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else
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press = -1;
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eff_height =
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(wet_line[xp].h + wet_line[xp].w -
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192) * (1.0 / 255);
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contact = (press + eff_height) * 0.2;
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if (contact > 0.5)
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contact =
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1 - 0.5 * exp(-2.0 * contact - 1);
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if (contact > 0.0001) {
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int v;
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double rnd = rand() * (1.0 / RAND_MAX);
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v = wet_line[xp].rd;
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wet_line[xp].rd =
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floor(v +
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(paint->rd * strength -
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v) * contact + rnd);
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v = wet_line[xp].rw;
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wet_line[xp].rw =
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floor(v +
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(paint->rw * strength -
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v) * contact + rnd);
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v = wet_line[xp].gd;
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wet_line[xp].gd =
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floor(v +
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(paint->gd * strength -
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v) * contact + rnd);
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v = wet_line[xp].gw;
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wet_line[xp].gw =
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floor(v +
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(paint->gw * strength -
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v) * contact + rnd);
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v = wet_line[xp].bd;
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wet_line[xp].bd =
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floor(v +
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(paint->bd * strength -
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v) * contact + rnd);
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v = wet_line[xp].bw;
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wet_line[xp].bw =
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floor(v +
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(paint->bw * strength -
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v) * contact + rnd);
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v = wet_line[xp].w;
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wet_line[xp].w =
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floor(v + (paint->w - v) * contact +
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rnd);
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}
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}
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wet_line += layer->rowstride;
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}
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}
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