[media] vivid-tpg: precalculate colorspace/xfer_func combinations

Precalculate all the colorspace/transfer function combinations in order
to easily generate the correct colors.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vivid/vivid-tpg-colors.h

@@ -61,6 +61,8 @@ enum tpg_color {
 extern const struct color tpg_colors[TPG_COLOR_MAX];
 extern const unsigned short tpg_rec709_to_linear[255 * 16 + 1];
 extern const unsigned short tpg_linear_to_rec709[255 * 16 + 1];
-extern const struct color16 tpg_csc_colors[V4L2_COLORSPACE_BT2020 + 1][TPG_COLOR_CSC_BLACK + 1];
+extern const struct color16 tpg_csc_colors[V4L2_COLORSPACE_BT2020 + 1]
+					  [V4L2_XFER_FUNC_NONE + 1]
+					  [TPG_COLOR_CSC_BLACK + 1];
 
 #endif

drivers/media/platform/vivid/vivid-tpg.c

@@ -706,9 +706,9 @@ static void precalculate_color(struct tpg_data *tpg, int k)
 	}
 
 	if (tpg->pattern == TPG_PAT_CSC_COLORBAR && col <= TPG_COLOR_CSC_BLACK) {
-		r = tpg_csc_colors[tpg->colorspace][col].r;
-		g = tpg_csc_colors[tpg->colorspace][col].g;
-		b = tpg_csc_colors[tpg->colorspace][col].b;
+		r = tpg_csc_colors[tpg->colorspace][tpg->real_xfer_func][col].r;
+		g = tpg_csc_colors[tpg->colorspace][tpg->real_xfer_func][col].g;
+		b = tpg_csc_colors[tpg->colorspace][tpg->real_xfer_func][col].b;
 	} else {
 		r <<= 4;
 		g <<= 4;