#include "sherlock/sherlock.h"
#include "lib/math.h"
+#include "images/images.h"
#include "images/color.h"
+struct color color_black = { .color_space = COLOR_SPACE_GRAYSCALE };
+struct color color_white = { .c = { 255 }, .color_space = COLOR_SPACE_GRAYSCALE };
+
+inline void
+color_put_grayscale(byte *dest, struct color *color)
+{
+ switch (color->color_space)
+ {
+ case COLOR_SPACE_GRAYSCALE:
+ dest[0] = color->c[0];
+ break;
+ case COLOR_SPACE_RGB:
+ dest[0] = rgb_to_gray_func(color->c[0], color->c[1], color->c[2]);
+ break;
+ default:
+ ASSERT(0);
+ }
+}
+
+inline void
+color_put_rgb(byte *dest, struct color *color)
+{
+ switch (color->color_space)
+ {
+ case COLOR_SPACE_GRAYSCALE:
+ dest[0] = dest[1] = dest[2] = color->c[0];
+ break;
+ case COLOR_SPACE_RGB:
+ dest[0] = color->c[0];
+ dest[1] = color->c[1];
+ dest[2] = color->c[2];
+ break;
+ default:
+ ASSERT(0);
+ }
+}
+
+void
+color_put_color_space(byte *dest, struct color *color, enum color_space color_space)
+{
+ switch (color_space)
+ {
+ case COLOR_SPACE_GRAYSCALE:
+ color_put_grayscale(dest, color);
+ break;
+ case COLOR_SPACE_RGB:
+ color_put_rgb(dest, color);
+ break;
+ default:
+ ASSERT(0);
+ }
+}
/********************* EXACT CONVERSION ROUTINES **********************/
xyz[2] = SRGB_XYZ_ZR * a[0] + SRGB_XYZ_ZG * a[1] + SRGB_XYZ_ZB * a[2];
}
+/* XYZ to sRGB */
+void
+xyz_to_srgb_slow(double srgb[3], double xyz[3])
+{
+ double a[3];
+ a[0] = 3.2406 * xyz[0] + -1.5372 * xyz[1] + -0.4986 * xyz[2];
+ a[1] = -0.9689 * xyz[0] + 1.8758 * xyz[1] + 0.0415 * xyz[2];
+ a[2] = 0.0557 * xyz[0] + -0.2040 * xyz[1] + 1.0570 * xyz[2];
+ for (uns i = 0; i < 3; i++)
+ if (a[i] > 0.0031308)
+ srgb[i] = 1.055 * pow(a[i], 1 / 2.4) - 0.055;
+ else
+ srgb[i] = 12.92 * a[i];
+}
+
/* XYZ to CIE-Luv */
void
xyz_to_luv_slow(double luv[3], double xyz[3])
}
}
+/* CIE-Luv to XYZ */
+void
+luv_to_xyz_slow(double xyz[3], double luv[3])
+{
+ double var_u = luv[1] / (13 * luv[0]) + (4 * REF_WHITE_X / (REF_WHITE_X + 15 * REF_WHITE_Y + 3 * REF_WHITE_Z));
+ double var_v = luv[2] / (13 * luv[0]) + (9 * REF_WHITE_Y / (REF_WHITE_X + 15 * REF_WHITE_Y + 3 * REF_WHITE_Z));
+ double var_y = (luv[0] + 16) / 116;
+ double pow_y = var_y * var_y * var_y;
+ if (pow_y > 0.008856)
+ var_y = pow_y;
+ else
+ var_y = (var_y - 16 / 116) / 7.787;
+ xyz[1] = var_y;
+ xyz[0] = -(9 * xyz[1] * var_u) / ((var_u - 4) * var_v - var_u * var_v);
+ xyz[2] = (9 * xyz[1] - 15 * var_v * xyz[1] - var_v * xyz[0]) / (3 * var_v);
+}
+
/***************** OPTIMIZED SRGB -> LUV CONVERSION *********************/