diff options
Diffstat (limited to 'libglitter_get_colour_space_conversion_matrix_double.c')
| -rw-r--r-- | libglitter_get_colour_space_conversion_matrix_double.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/libglitter_get_colour_space_conversion_matrix_double.c b/libglitter_get_colour_space_conversion_matrix_double.c deleted file mode 100644 index 285f625..0000000 --- a/libglitter_get_colour_space_conversion_matrix_double.c +++ /dev/null @@ -1,113 +0,0 @@ -/* See LICENSE file for copyright and license details. */ -#include "common.h" -#ifndef TEST - - -#define X(x, y) ((x) / (y)) -#define Z(x, y) ((1 - (x)) / (y) - 1) - - -#if defined(__GNUC__) && !defined(__clang__) -# pragma GCC diagnostic push -# pragma GCC diagnostic ignored "-Wunsuffixed-float-constants" -#endif - - -/** - * CIE XYZ-to-sRGB conversion matrix, - * in column-major order - */ -static const double srgb[3][3] = { - { 3.240446254647737056586720427731, -0.969266606244679751469561779231, 0.055643503564352832235773149705}, - {-1.537134761820080353089679192635, 1.876011959788370209167851498933, -0.204026179735960239147729566866}, - {-0.498530193022728773666329971093, 0.041556042214430065351304932619, 1.057226567722703292062647051353}}; - - -#if defined(__GNUC__) && !defined(__clang__) -# pragma GCC diagnostic pop -#endif - - -static void -invert(double m[3][4]) /* row-major order */ -{ - double t; - size_t i; - - /* Set m[0][0] = 1 */ for (t = m[0][0], i = 0; i < 4; i++) m[0][i] /= t; - /* Set m[1][0] = 0 */ for (t = m[1][0], i = 0; i < 4; i++) m[1][i] -= t * m[0][i]; - /* Set m[2][0] = 0 */ for (t = m[2][0], i = 0; i < 4; i++) m[2][i] -= t * m[0][i]; - - /* Set m[1][1] = 1 */ for (t = m[1][1], i = 1; i < 4; i++) m[1][i] /= t; - /* Set m[2][1] = 0 */ for (t = m[2][1], i = 1; i < 4; i++) m[2][i] -= t * m[1][i]; - /* Set m[0][1] = 0 */ for (t = m[0][1], i = 1; i < 4; i++) m[0][i] -= t * m[1][i]; - - /* Set m[2][2] = 1 */ for (t = m[2][2], i = 2; i < 4; i++) m[2][i] /= t; - /* Set m[1][2] = 0 */ for (t = m[1][2], i = 2; i < 4; i++) m[1][i] -= t * m[2][i]; - /* Set m[0][2] = 0 */ for (t = m[0][2], i = 2; i < 4; i++) m[0][i] -= t * m[2][i]; -} - - -void -libglitter_get_colour_space_conversion_matrix_double(double matrix[3][3], double c1x, double c1y, - double c2x, double c2y, double c3x, double c3y, - double white_x, double white_y, double white_Y, int xyz) -{ - double mat[3][4]; - double x1, x2, x3; - double y1, y2, y3; - double z1, z2, z3; - - /* Get colour space in CIE XYZ (the matrix is in row-major order) */ - mat[0][0] = x1 = X(c1x, c1y); - mat[0][1] = x2 = X(c2x, c2y); - mat[0][2] = x3 = X(c3x, c3y); - mat[1][3] = X(white_x, white_y) * white_Y; - mat[1][0] = 1; - mat[1][1] = 1; - mat[1][2] = 1; - mat[1][3] = white_Y; - mat[2][0] = z1 = Z(c1x, c1y); - mat[2][1] = z2 = Z(c2x, c2y); - mat[2][2] = z3 = Z(c3x, c3y); - mat[2][3] = Z(white_x, white_y) * white_Y; - invert(mat); - y1 = mat[0][3]; - y2 = mat[1][3]; - y3 = mat[2][3]; - - /* [x1, x2, x3; y1, y2, y3; z1, z2, z3] is - * the output RGB-to-CIE XYZ conversion matrix. - * If sRGB is desired, it is multiplied by the - * CIE XYZ-to-sRGB conversion matrix to get the - * output RGB-to-sRGB conversion matrix. The - * matrices are in column-major order. */ - if (!xyz) { - matrix[0][0] = x1 * srgb[0][0] + x2 * srgb[0][1] + x3 * srgb[0][2]; - matrix[1][0] = x1 * srgb[1][0] + x2 * srgb[1][1] + x3 * srgb[1][2]; - matrix[2][0] = x1 * srgb[2][0] + x2 * srgb[2][1] + x3 * srgb[2][2]; - matrix[0][1] = y1 * srgb[0][0] + y2 * srgb[0][1] + y3 * srgb[0][2]; - matrix[1][1] = y1 * srgb[1][0] + y2 * srgb[1][1] + y3 * srgb[1][2]; - matrix[2][1] = y1 * srgb[2][0] + y2 * srgb[2][1] + y3 * srgb[2][2]; - matrix[0][2] = z1 * srgb[0][0] + z2 * srgb[0][1] + z3 * srgb[0][2]; - matrix[1][2] = z1 * srgb[1][0] + z2 * srgb[1][1] + z3 * srgb[1][2]; - matrix[2][2] = z1 * srgb[2][0] + z2 * srgb[2][1] + z3 * srgb[2][2]; - } else { - matrix[0][0] = x1, matrix[1][0] = x2, matrix[2][0] = x3; - matrix[0][1] = y1, matrix[1][1] = y2, matrix[2][1] = y3; - matrix[0][2] = z1, matrix[1][2] = z2, matrix[2][2] = z3; - } -} - - -#else - - -int -main(void) -{ - return 0; /* TODO add test */ -} - - -#endif |