Added three XYZ color space options in code, will be activated later.

Thanks matt for the typing work :)

2 files changed, 26 insertions, 8 deletions

diff --git a/source/blender/blenlib/BLI_arithb.h b/source/blender/blenlib/BLI_arithb.h
index 4b858dcb503..e2e71a2fb1a 100644
--- a/source/blender/blenlib/BLI_arithb.h
+++ b/source/blender/blenlib/BLI_arithb.h
@@ -322,6 +322,10 @@ void i_window(
 	float mat[][4]
 );
 
+#define BLI_CS_SMPTE	0
+#define BLI_CS_REC709	1
+#define BLI_CS_CIE		2
+
 void hsv_to_rgb(float h, float s, float v, float *r, float *g, float *b);
 void hex_to_rgb(char *hexcol, float *r, float *g, float *b);
 void rgb_to_yuv(float r, float g, float b, float *ly, float *lu, float *lv);
@@ -329,7 +333,7 @@ void yuv_to_rgb(float y, float u, float v, float *lr, float *lg, float *lb);
 void ycc_to_rgb(float y, float cb, float cr, float *lr, float *lg, float *lb);
 void rgb_to_ycc(float r, float g, float b, float *ly, float *lcb, float *lcr);
 void rgb_to_hsv(float r, float g, float b, float *lh, float *ls, float *lv);
-void xyz_to_rgb(float x, float y, float z, float *r, float *g, float *b);
+void xyz_to_rgb(float x, float y, float z, float *r, float *g, float *b, int colorspace);
 int constrain_rgb(float *r, float *g, float *b);
 void gamma_correct_rgb(float *r, float *g, float *b);
 unsigned int hsv_to_cpack(float h, float s, float v);
diff --git a/source/blender/blenlib/intern/arithb.c b/source/blender/blenlib/intern/arithb.c
index c6634eb7707..888a5ab2f64 100644
--- a/source/blender/blenlib/intern/arithb.c
+++ b/source/blender/blenlib/intern/arithb.c
@@ -3453,13 +3453,27 @@ void rgb_to_hsv(float r, float g, float b, float *lh, float *ls, float *lv)
 	*lv = v;
 }
 
-/*http://brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
- * SMPTE-C XYZ to RGB matrix*/
-void xyz_to_rgb(float xc, float yc, float zc, float *r, float *g, float *b)
-{
-	*r = (3.50570	* xc) + (-1.73964	* yc) + (-0.544011	* zc);
-	*g = (-1.06906	* xc) + (1.97781	* yc) + (0.0351720	* zc);
-	*b = (0.0563117	* xc) + (-0.196994	* yc) + (1.05005	* zc);
+/*http://brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html */
+
+void xyz_to_rgb(float xc, float yc, float zc, float *r, float *g, float *b, int colorspace)
+{
+	switch (colorspace) { 
+	case BLI_CS_SMPTE:
+		*r = (3.50570	* xc) + (-1.73964	* yc) + (-0.544011	* zc);
+		*g = (-1.06906	* xc) + (1.97781	* yc) + (0.0351720	* zc);
+		*b = (0.0563117	* xc) + (-0.196994	* yc) + (1.05005	* zc);
+		break;
+	case BLI_CS_REC709:
+		*r = (3.240476	* xc) + (-1.537150	* yc) + (-0.498535	* zc);
+		*g = (-0.969256 * xc) + (1.875992 * yc) + (0.041556 * zc);
+		*b = (0.055648	* xc) + (-0.204043	* yc) + (1.057311	* zc);
+		break;
+	case BLI_CS_CIE:
+		*r = (2.28783848734076f	* xc) + (-0.833367677835217f	* yc) + (-0.454470795871421f	* zc);
+		*g = (-0.511651380743862f * xc) + (1.42275837632178f * yc) + (0.0888930017552939f * zc);
+		*b = (0.00572040983140966f	* xc) + (-0.0159068485104036f	* yc) + (1.0101864083734f	* zc);
+		break;
+	}
 }
 
 /*If the requested RGB shade contains a negative weight for