ColorRGB heightmap(Point2D point)
{
static int init = 0;
static ColorRGB greyscale[256];
if(!init) {
int i;
for(i = 0; i < 256; i++) {
greyscale[i] = rgb(i, i, i);
}
init = 1;
}
float color_percent = Perlin2D(point.x, point.y, 0.5, 10);
if(color_percent < 0) {
color_percent = 0.0f;
}
if(color_percent > 1) {
color_percent = 1.0f;
}
color_percent *= 255;
int rounded = round_i(color_percent);
return greyscale[rounded];
}
vec sqtrain(const vec &inDB, int SIZE)
{
vec DB(inDB);
vec Levels, Levels_old;
ivec indexlist(SIZE + 1);
int il, im, ih, i;
int SIZEDB = inDB.length();
double x;
sort(DB);
Levels = DB(round_i(linspace(0.01 * SIZEDB, 0.99 * SIZEDB, SIZE)));
Levels_old = zeros(SIZE);
while (energy(Levels - Levels_old) > 0.0001) {
Levels_old = Levels;
for (i = 0;i < SIZE - 1;i++) {
x = (Levels(i) + Levels(i + 1)) / 2;
il = 0;
ih = SIZEDB - 1;
while (il < ih - 1) {
im = (il + ih) / 2;
if (x < DB(im)) ih = im;
else il = im;
}
indexlist(i + 1) = il;
}
indexlist(0) = -1;
indexlist(SIZE) = SIZEDB - 1;
for (i = 0;i < SIZE;i++) Levels(i) = mean(DB(indexlist(i) + 1, indexlist(i + 1)));
}
return Levels;
}
inline static signed char double_to_char(double x)
{
if (x >= 127.0)
return 127;
else if (x <= -128.0)
return -128;
else
return static_cast<char>(round_i(x));
}
inline static short double_to_short(double x)
{
if (x >= 32767.0)
return 32767;
else if (x <= -32768.0)
return -32768;
else
return static_cast<short>(round_i(x));
}
ColorRGB color_field(Point2D point)
{
ColorRGB colors[] = {
rgb(0, 0, 64),
rgb(128, 0, 128),
rgb(128, 0, 255),
rgb(128, 64, 255),
rgb(64, 64, 255),
rgb(0, 128, 255),
rgb(0, 192, 255),
rgb(0, 255, 255),
rgb(0, 255, 128),
rgb(0, 255, 64),
rgb(64, 255, 64),
rgb(64, 255, 0),
rgb(128, 255, 0),
rgb(255, 255, 0),
rgb(255, 128, 0),
rgb(128, 0, 0),
rgb(255, 0, 0),
rgb(255, 64, 64),
rgb(255, 128, 128),
rgb(255, 192, 192),
rgb(255, 255, 255)
};
float color_percent = Perlin2D(point.x, point.y, 0.5, 10);
if(color_percent < 0) {
color_percent = 0.0f;
}
if(color_percent > 1) {
color_percent = 1.0f;
}
color_percent *= ((sizeof(colors) / sizeof(colors[0])) - 1);
int rounded = round_i(color_percent);
float alpha = frac(color_percent);
int bg, fg;
if(alpha > 0.5) {
bg = rounded - 1;
fg = rounded;
alpha = 1.0f - alpha;
} else {
bg = rounded;
fg = rounded + 1;
}
return blend(colors[bg], colors[fg], alpha);
}
int main(int argc, char* argv[])
{
FILE* in = fopen(argv[1], "r");
FILE* out = fopen(argv[3], "w+");
unsigned char* buf;
char optbuf[16];
char c;
unsigned char* r;
unsigned char* g;
unsigned char* b;
double* y = (double*)malloc(BLOK * BLOK * sizeof(double));
double* cr = (double*)malloc(BLOK * BLOK * sizeof(double));
double* cb = (double*)malloc(BLOK * BLOK * sizeof(double));
double* y_transf = (double*)malloc(BLOK * BLOK * sizeof(double));
double* cr_transf = (double*)malloc(BLOK * BLOK * sizeof(double));
double* cb_transf = (double*)malloc(BLOK * BLOK * sizeof(double));
int m,n;
int rgb_comp;
int i;
int j;
int k;
int blok_x = atoi(argv[2]);
int K1[] = { 16, 11, 10, 16, 24, 40, 51, 61,
12, 12, 14, 19, 26, 58, 60, 55,
14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62,
18, 22, 37, 56, 68, 109, 103, 77,
24, 35, 55, 64, 81, 104, 113, 92,
49, 64, 78, 87, 103, 121, 120, 101,
72, 92, 95, 98, 112, 100, 103, 99 };
int K2[] = { 17, 18, 24, 47, 99, 99, 99, 99,
18, 21, 26, 66, 99, 99, 99, 99,
24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99 ,99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99 ,99,
99, 99, 99, 99, 99, 99, 99 ,99,
99, 99, 99, 99, 99, 99, 99 ,99,
99, 99, 99, 99, 99, 99, 99 ,99 };
if (argc != 4) {
printf("Neispravan poziv programa\n");
return 1;
}
if (!in) {
printf("Nije moguce otvoriti sliku\n");
return 1;
}
fgets(optbuf, sizeof(optbuf), in);
if (optbuf[0] != 'P' || optbuf[1] != '6') {
printf("Format mora biti P6\n");
return 1;
}
c = getc(in);
while (c == '#') {
while (getc(in) != '\n');
c = getc(in);
}
ungetc(c, in);
if (fscanf(in, "%d %d", &m, &n) != 2) {
printf("Nepravilna velicina slike\n");
return 1;
}
buf = (unsigned char*)malloc(m * n * 3 * sizeof(unsigned char));
r = (unsigned char*)malloc(m * n * sizeof(unsigned char));
g = (unsigned char*)malloc(m * n * sizeof(unsigned char));
b = (unsigned char*)malloc(m * n * sizeof(unsigned char));
if (fscanf(in, "%d", &rgb_comp) != 1) {
printf("Nemoguce ucitati dubinu RGB komponente\n");
return 1;
}
if (rgb_comp != 255) {
printf("Nepravilna dubina RGB komponente\n");
return 1;
}
fscanf(in, "%d", &rgb_comp); /* visak... */
fread(buf, 3 * m, n, in);
for (i = 0, j = 0; i < m * n * 3; i += 3, j++) {
r[j] = buf[i];
g[j] = buf[i + 1];
b[j] = buf[i + 2];
}
/* izvadi blok */
k = 0;
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
int K = blok_x - (blok_x / (m / BLOK)) * (m / BLOK);
y[k] = r[i * m + (blok_x / (m / BLOK))
* (m * BLOK) + K * BLOK + j];
cb[k] = g[i * m + (blok_x / (m / BLOK))
* (m * BLOK) + K * BLOK + j];
cr[k] = b[i * m + (blok_x / (m / BLOK))
* (m * BLOK) + K * BLOK + j];
k++;
}
}
/* prebaci u YCbCr */
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
int ij = i * BLOK + j;
double r = y[ij];
double g = cb[ij];
double b = cr[ij];
y[ij] = 0.299 * r + 0.587 * g + 0.114 * b;
cb[ij] = 128 - 0.168736 * r - 0.331264 * g + 0.5 * b;
cr[ij] = 128 + 0.5 * r -0.418688 * g - 0.081312 * b;
}
}
/* napravi pomak */
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
y[i * BLOK + j] = y[i * BLOK + j] + POMAK;
cb[i * BLOK + j] = cb[i * BLOK + j] + POMAK;
cr[i * BLOK + j] = cr[i * BLOK + j] + POMAK;
}
}
/* napravi DCT */
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
y_transf[i * BLOK + j] = DCT(i, j, y);
cb_transf[i * BLOK + j] = DCT(i, j, cb);
cr_transf[i * BLOK + j] = DCT(i, j, cr);
}
}
/* kvantiziraj */
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
y_transf[i * BLOK + j] =
round_i(y_transf[i * BLOK + j] / K1[i * BLOK + j]);
cb_transf[i * BLOK + j] =
round_i(cb_transf[i * BLOK + j] / K2[i * BLOK + j]);
cr_transf[i * BLOK + j] =
round_i(cr_transf[i * BLOK + j] / K2[i * BLOK + j]);
}
}
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
fprintf(out, "%.0f ", y_transf[i * BLOK + j]);
}
fprintf(out, "\n");
}
fprintf(out, "\n");
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
fprintf(out, "%.0f ", cb_transf[i * BLOK + j]);
}
fprintf(out, "\n");
}
fprintf(out, "\n");
for (i = 0; i < BLOK; i++) {
for (j = 0; j < BLOK; j++) {
fprintf(out, "%.0f ", cr_transf[i * BLOK + j]);
}
fprintf(out, "\n");
}
fclose(out);
fclose(in);
free(buf);
free(r);
free(g);
free(b);
free(y);
free(cb);
free(cr);
free(y_transf);
free(cb_transf);
free(cr_transf);
return 0;
}
