Single Color Band scrolling left to right effects (#5867)

docs/feature_rgb_matrix.md

@@ -194,6 +194,8 @@ enum rgb_matrix_effects {
     RGB_MATRIX_ALPHAS_MODS,         // Static dual hue, speed is hue for secondary hue
     RGB_MATRIX_GRADIENT_UP_DOWN,    // Static gradient top to bottom, speed controls how much gradient changes
     RGB_MATRIX_BREATHING,           // Single hue brightness cycling animation
+    RGB_MATRIX_BAND_SAT,        // Single hue band fading saturation scrolling left to right
+    RGB_MATRIX_BAND_VAL,        // Single hue band fading brightness scrolling left to right
     RGB_MATRIX_CYCLE_ALL,           // Full keyboard solid hue cycling through full gradient
     RGB_MATRIX_CYCLE_LEFT_RIGHT,    // Full gradient scrolling left to right
     RGB_MATRIX_CYCLE_UP_DOWN,       // Full gradient scrolling top to bottom
@@ -235,6 +237,8 @@ You can disable a single effect by defining `DISABLE_[EFFECT_NAME]` in your `con
 |`#define DISABLE_RGB_MATRIX_ALPHAS_MODS`               |Disables `RGB_MATRIX_ALPHAS_MODS`              |
 |`#define DISABLE_RGB_MATRIX_GRADIENT_UP_DOWN`          |Disables `RGB_MATRIX_GRADIENT_UP_DOWN`         |
 |`#define DISABLE_RGB_MATRIX_BREATHING`                 |Disables `RGB_MATRIX_BREATHING`                |
+|`#define DISABLE_RGB_MATRIX_BAND_SAT`                  |Disables `RGB_MATRIX_BAND_SAT`                 |
+|`#define DISABLE_RGB_MATRIX_BAND_VAL`                  |Disables `RGB_MATRIX_BAND_VAL`                 |
 |`#define DISABLE_RGB_MATRIX_CYCLE_ALL`                 |Disables `RGB_MATRIX_CYCLE_ALL`                |
 |`#define DISABLE_RGB_MATRIX_CYCLE_LEFT_RIGHT`          |Disables `RGB_MATRIX_CYCLE_LEFT_RIGHT`         |
 |`#define DISABLE_RGB_MATRIX_CYCLE_UP_DOWN`             |Disables `RGB_MATRIX_CYCLE_UP_DOWN`            |

quantum/rgb_matrix_animations/colorband_sat_anim.h

@@ -0,0 +1,21 @@
+#ifndef DISABLE_RGB_MATRIX_BAND_SAT
+RGB_MATRIX_EFFECT(BAND_SAT)
+#ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+bool BAND_SAT(effect_params_t* params) {
+  RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+  HSV hsv = { rgb_matrix_config.hue, 0, rgb_matrix_config.val };
+  uint8_t time = scale16by8(g_rgb_counters.tick, rgb_matrix_config.speed / 4);
+  for (uint8_t i = led_min; i < led_max; i++) {
+    RGB_MATRIX_TEST_LED_FLAGS();
+    int16_t s = rgb_matrix_config.sat - abs(scale8(g_led_config.point[i].x, 228) + 28 - time) * 8;
+    hsv.s = s < 0 ? 0 : s;
+    RGB rgb = hsv_to_rgb(hsv);
+    rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+  }
+  return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif // DISABLE_RGB_MATRIX_BAND_SAT

quantum/rgb_matrix_animations/colorband_val_anim.h

@@ -0,0 +1,21 @@
+#ifndef DISABLE_RGB_MATRIX_BAND_VAL
+RGB_MATRIX_EFFECT(BAND_VAL)
+#ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+bool BAND_VAL(effect_params_t* params) {
+  RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+  HSV hsv = { rgb_matrix_config.hue, rgb_matrix_config.sat, 0 };
+  uint8_t time = scale16by8(g_rgb_counters.tick, rgb_matrix_config.speed / 4);
+  for (uint8_t i = led_min; i < led_max; i++) {
+    RGB_MATRIX_TEST_LED_FLAGS();
+    int16_t v = rgb_matrix_config.val - abs(scale8(g_led_config.point[i].x, 228) + 28 - time) * 8;
+    hsv.v = v < 0 ? 0 : v;
+    RGB rgb = hsv_to_rgb(hsv);
+    rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+  }
+  return led_max < DRIVER_LED_TOTAL;
+}
+
+#endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+#endif // DISABLE_RGB_MATRIX_BAND_VAL

quantum/rgb_matrix_animations/rgb_matrix_effects.inc

@@ -3,6 +3,8 @@
 #include "rgb_matrix_animations/alpha_mods_anim.h"
 #include "rgb_matrix_animations/gradient_up_down_anim.h"
 #include "rgb_matrix_animations/breathing_anim.h"
+#include "rgb_matrix_animations/colorband_sat_anim.h"
+#include "rgb_matrix_animations/colorband_val_anim.h"
 #include "rgb_matrix_animations/cycle_all_anim.h"
 #include "rgb_matrix_animations/cycle_left_right_anim.h"
 #include "rgb_matrix_animations/cycle_up_down_anim.h"