From 7f2ac4c5765f899d53aef6456a99be910ce3f3b5 Mon Sep 17 00:00:00 2001
From: Albert Y <76888457+filterpaper@users.noreply.github.com>
Date: Wed, 28 Dec 2022 04:11:31 +0800
Subject: De-obfuscate random8 functions in RGB matrix animations (#19416)

---
 quantum/rgb_matrix/animations/pixel_flow_anim.h |  4 ++--
 quantum/rgb_matrix/animations/pixel_rain_anim.h | 21 ++++-----------------
 quantum/rgb_matrix/animations/raindrops_anim.h  |  2 +-
 3 files changed, 7 insertions(+), 20 deletions(-)

diff --git a/quantum/rgb_matrix/animations/pixel_flow_anim.h b/quantum/rgb_matrix/animations/pixel_flow_anim.h
index 8628c3c2ec..27567b4f3a 100644
--- a/quantum/rgb_matrix/animations/pixel_flow_anim.h
+++ b/quantum/rgb_matrix/animations/pixel_flow_anim.h
@@ -22,7 +22,7 @@ static bool PIXEL_FLOW(effect_params_t* params) {
         // Clear LEDs and fill the state array
         rgb_matrix_set_color_all(0, 0, 0);
         for (uint8_t j = 0; j < RGB_MATRIX_LED_COUNT; ++j) {
-            led[j] = (random8() & 2) ? (RGB){0, 0, 0} : hsv_to_rgb((HSV){random8(), qadd8(random8() >> 1, 127), rgb_matrix_config.hsv.v});
+            led[j] = (random8() & 2) ? (RGB){0, 0, 0} : hsv_to_rgb((HSV){random8(), random8_min_max(127, 255), rgb_matrix_config.hsv.v});
         }
     }
 
@@ -39,7 +39,7 @@ static bool PIXEL_FLOW(effect_params_t* params) {
             led[j] = led[j + 1];
         }
         // Fill last LED
-        led[led_max - 1] = (random8() & 2) ? (RGB){0, 0, 0} : hsv_to_rgb((HSV){random8(), qadd8(random8() >> 1, 127), rgb_matrix_config.hsv.v});
+        led[led_max - 1] = (random8() & 2) ? (RGB){0, 0, 0} : hsv_to_rgb((HSV){random8(), random8_min_max(127, 255), rgb_matrix_config.hsv.v});
         // Set pulse timer
         wait_timer = g_rgb_timer + interval();
     }
diff --git a/quantum/rgb_matrix/animations/pixel_rain_anim.h b/quantum/rgb_matrix/animations/pixel_rain_anim.h
index fded60340f..ccea8d976a 100644
--- a/quantum/rgb_matrix/animations/pixel_rain_anim.h
+++ b/quantum/rgb_matrix/animations/pixel_rain_anim.h
@@ -1,18 +1,5 @@
-/* Copyright (C) 2021 @filterpaper
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2022 @filterpaper
+// SPDX-License-Identifier: GPL-2.0+
 
 #ifdef ENABLE_RGB_MATRIX_PIXEL_RAIN
 RGB_MATRIX_EFFECT(PIXEL_RAIN)
@@ -32,7 +19,7 @@ static bool PIXEL_RAIN(effect_params_t* params) {
         if (off) {
             rgb_matrix_set_color(i, 0, 0, 0);
         } else {
-            HSV hsv = {random8(), qadd8(random8() >> 1, 127), rgb_matrix_config.hsv.v};
+            HSV hsv = {random8(), random8_min_max(127, 255), rgb_matrix_config.hsv.v};
             RGB rgb = rgb_matrix_hsv_to_rgb(hsv);
             rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
         }
@@ -41,7 +28,7 @@ static bool PIXEL_RAIN(effect_params_t* params) {
 
     RGB_MATRIX_USE_LIMITS(led_min, led_max);
     if (g_rgb_timer > wait_timer) {
-        rain_pixel(mod8(random8(), RGB_MATRIX_LED_COUNT), params, random8() & 2);
+        rain_pixel(random8_max(RGB_MATRIX_LED_COUNT), params, random8() & 2);
     }
     return rgb_matrix_check_finished_leds(led_max);
 }
diff --git a/quantum/rgb_matrix/animations/raindrops_anim.h b/quantum/rgb_matrix/animations/raindrops_anim.h
index 6b92d649ad..e8e1f6de04 100644
--- a/quantum/rgb_matrix/animations/raindrops_anim.h
+++ b/quantum/rgb_matrix/animations/raindrops_anim.h
@@ -24,7 +24,7 @@ bool RAINDROPS(effect_params_t* params) {
     if (!params->init) {
         // Change one LED every tick, make sure speed is not 0
         if (scale16by8(g_rgb_timer, qadd8(rgb_matrix_config.speed, 16)) % 10 == 0) {
-            raindrops_set_color(random8() % RGB_MATRIX_LED_COUNT, params);
+            raindrops_set_color(random8_max(RGB_MATRIX_LED_COUNT), params);
         }
     } else {
         for (int i = led_min; i < led_max; i++) {
-- 
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