pxCol function

2 files changed, 14 insertions, 0 deletions

diff --git a/src/px.c b/src/px.c
index e3f8da9..5281432 100644
--- a/src/px.c
+++ b/src/px.c
@@ -269,6 +269,17 @@ _pxPalt(const PxPaltArgs *args)
 		pxpal[args->col].t = args->t;
 }
 
+PxCol
+pxCol(uint8_t r, uint8_t g, uint8_t b)
+{
+	for (int i = 0; i < 256; i++) {
+		const PxPal *pal = &pxpal[i];
+		if (pal->r == r && pal->g == g && pal->b == b)
+			return i;
+	}
+	return -1;
+}
+
 int
 pxMin(int a, int b)
 {
diff --git a/src/px.h b/src/px.h
index 9eb9610..1d08bd1 100644
--- a/src/px.h
+++ b/src/px.h
@@ -112,6 +112,9 @@ void _pxSpal(const PxSpalArgs *args);
 	.col=-1, .t=true, ._=0, __VA_ARGS__})
 void _pxPalt(const PxPaltArgs *args);
 
+/* Try to find a color in palette, return 255 on error. */
+PxCol pxCol(uint8_t r, uint8_t g, uint8_t b);
+
 /*** MATH ***/
 int pxMin(int a, int b);
 int pxMax(int a, int b);