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//========================================================================
//
// SplashScreen.cc
//
//========================================================================
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif
#include "gmem.h"
#include "SplashMath.h"
#include "SplashScreen.h"
//------------------------------------------------------------------------
// SplashScreen
//------------------------------------------------------------------------
// This generates a 45 degree screen using a circular dot spot
// function. DPI = resolution / ((size / 2) * sqrt(2)).
// Gamma correction (gamma = 1 / 1.33) is also computed here.
SplashScreen::SplashScreen(int sizeA) {
SplashCoord *dist;
SplashCoord u, v, d;
int x, y, x1, y1, i;
size = sizeA >> 1;
if (size < 1) {
size = 1;
}
// initialize the threshold matrix
mat = (SplashCoord *)gmalloc(2 * size * size * sizeof(SplashCoord));
for (y = 0; y < 2 * size; ++y) {
for (x = 0; x < size; ++x) {
mat[y * size + x] = -1;
}
}
// build the distance matrix
dist = (SplashCoord *)gmalloc(2 * size * size * sizeof(SplashCoord));
for (y = 0; y < size; ++y) {
for (x = 0; x < size; ++x) {
if (x + y < size - 1) {
u = (SplashCoord)x + 0.5 - 0; //~ (-0.5);
v = (SplashCoord)y + 0.5 - 0;
} else {
u = (SplashCoord)x + 0.5 - (SplashCoord)size; //~ ((SplashCoord)size - 0.5);
v = (SplashCoord)y + 0.5 - (SplashCoord)size;
}
dist[y * size + x] = u*u + v*v;
}
}
for (y = 0; y < size; ++y) {
for (x = 0; x < size; ++x) {
if (x < y) {
u = (SplashCoord)x + 0.5 - 0; //~ (-0.5);
v = (SplashCoord)y + 0.5 - (SplashCoord)size;
} else {
u = (SplashCoord)x + 0.5 - (SplashCoord)size; //~ ((SplashCoord)size - 0.5);
v = (SplashCoord)y + 0.5 - 0;
}
dist[(size + y) * size + x] = u*u + v*v;
}
}
// build the threshold matrix
x1 = y1 = 0; // make gcc happy
for (i = 1; i <= 2 * size * size; ++i) {
d = 2 * size * size;
for (y = 0; y < 2 * size; ++y) {
for (x = 0; x < size; ++x) {
if (mat[y * size + x] < 0 &&
dist[y * size + x] < d) {
x1 = x;
y1 = y;
d = dist[y1 * size + x1];
}
}
}
u = 1.0 - (SplashCoord)i / (SplashCoord)(2 * size * size + 1);
mat[y1 * size + x1] = splashPow(u, 1.33);
}
gfree(dist);
}
SplashScreen::~SplashScreen() {
gfree(mat);
}
int SplashScreen::test(int x, int y, SplashCoord value) {
SplashCoord *mat1;
int xx, yy;
xx = x % (2 * size);
yy = y % (2 * size);
mat1 = mat;
if ((xx / size) ^ (yy / size)) {
mat1 += size * size;
}
xx %= size;
yy %= size;
return value < mat1[yy * size + xx] ? 0 : 1;
}
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