Use White channel on RGBW LEDs (#7678)

* Use White channel on RGBW LEDs

Co-authored-by: kwerdenker <sebastian.spindler@gmail.com>

* Manually apply white channel to array

* Move where convert_rgb_to_rgbw is called

* Fix type for rgbw led struct

* Add changes to Ergodox EZ

can revert if deemed necessary

* Revert "Add changes to Ergodox EZ"

This reverts commit aa44db198d40d758ca10470eb94615513592d1dd.

* Revert "Fix type for rgbw led struct"

This reverts commit c5c744cba040201cc0d124400773cf13f8a2cf22.

* Revert "Move where convert_rgb_to_rgbw is called"

This reverts commit cd7f17caf6dd30731c54b3be54490fe4519444f9.

* Revert changes and fix up functions

* Enable white channel for Ergodox EZ as well

* Only run conversion of rgblight is enabled

Co-authored-by: kwerdenker <sebastian.spindler@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/quantum/color.c b/quantum/color.c
index 1f398e240..8bd52444f 100644
--- a/quantum/color.c
+++ b/quantum/color.c
@@ -85,3 +85,17 @@ RGB hsv_to_rgb(HSV hsv) {
 
     return rgb;
 }
+
+#ifdef RGBW
+#ifndef MIN
+#    define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+void convert_rgb_to_rgbw(LED_TYPE *led) {
+    // Determine lowest value in all three colors, put that into
+    // the white channel and then shift all colors by that amount
+    led->w = MIN(led->r, MIN(led->g, led->b));
+    led->r -= led->w;
+    led->g -= led->w;
+    led->b -= led->w;
+}
+#endif