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#include <string.h>
#include "global_variables.h"
#include "dng.h"
void
dng_coeff (double cc[4][4],
double cm[4][3],
double xyz[3]) {
static const double rgb_xyz[3][3] = { /* RGB from XYZ */
{ 3.240479, -1.537150, -0.498535 },
{ -0.969256, 1.875992, 0.041556 },
{ 0.055648, -0.204043, 1.057311 } };
#if 0
static const double xyz_rgb[3][3] = { /* XYZ from RGB */
{ 0.412453, 0.357580, 0.180423 },
{ 0.212671, 0.715160, 0.072169 },
{ 0.019334, 0.119193, 0.950227 } };
#endif
double cam_xyz[4][3], xyz_cam[3][4], invert[3][6];
unsigned int i;
for (i = 0; i < colors; ++i) {
unsigned int j;
for (j = 0; j < 3; ++j) {
unsigned int k;
for (k = 0, cam_xyz[i][j] = 0.0; k < colors; ++k) {
cam_xyz[i][j] += cc[i][k] * cm[k][j] * xyz[j];
}
}
}
for (i = 0; i < colors; ++i) {
unsigned int j;
double camXyzSum;
for (j = 0, camXyzSum = 0.0; j < 3; ++j)
camXyzSum += cam_xyz[i][j];
for (j = 0; j < 3; ++j)
cam_xyz[i][j] /= camXyzSum;
pre_mul[i] = 1 / camXyzSum;
}
for (i = 0; i < 3; ++i) {
unsigned int j;
for (j = 0; j < 6; ++j)
invert[i][j] = j == i+3;
for (j = 0; j < 3; ++j) {
unsigned int k;
for (k = 0; k < colors; ++k)
invert[i][j] += cam_xyz[k][i] * cam_xyz[k][j];
}
}
for (i = 0; i < 3; ++i) {
double const num = invert[i][i];
unsigned int j;
unsigned int k;
for (j = 0; j < 6; ++j) /* Normalize row i */
invert[i][j] /= num;
for (k = 0; k < 3; ++k) { /* Subtract it from other rows */
if (k != i) {
double const num = invert[k][i];
unsigned int j;
for (j = 0; j < 6; ++j)
invert[k][j] -= invert[i][j] * num;
}
}
}
memset(xyz_cam, 0, sizeof xyz_cam);
for (i = 0; i < 3; ++i) {
unsigned int j;
for (j = 0; j < colors; ++j) {
unsigned int k;
for (k = 0; k < 3; ++k)
xyz_cam[i][j] += invert[i][k+3] * cam_xyz[j][k];
}
}
memset (coeff, 0, sizeof coeff);
for (i = 0; i < 3; ++i) {
unsigned int j;
for (j = 0; j < colors; ++j) {
unsigned int k;
for (k = 0; k < 3; ++k)
coeff[i][j] += rgb_xyz[i][k] * xyz_cam[k][j];
}
}
{
double greenSum;
unsigned int j;
unsigned int i;
for (j = 0, greenSum = 0.0; j < colors; ++j)
greenSum += coeff[1][j];
for (i = 0; i < 3; ++i) {
unsigned int j;
for (j = 0; j < colors; ++j)
coeff[i][j] /= greenSum;
}
}
use_coeff = 1;
}
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