Refactor Pixel Fractal effect (#17602)

* Refactor effect with smaller array

* Add RGB_MATRIX_USE_LIMITS call

* Remove spaces

Co-authored-by: Drashna Jaelre <drashna@live.com>

Co-authored-by: Drashna Jaelre <drashna@live.com>

quantum/rgb_matrix/animations/pixel_fractal_anim.h

@@ -1,19 +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 (C) 2022 @filterpaper
+// SPDX-License-Identifier: GPL-2.0-or-later
 // Inspired from 4x12 fractal created by @schwarzgrau
 
 #ifdef ENABLE_RGB_MATRIX_PIXEL_FRACTAL
@@ -22,12 +8,8 @@ RGB_MATRIX_EFFECT(PIXEL_FRACTAL)
 
 static bool PIXEL_FRACTAL(effect_params_t* params) {
 #        define MID_COL MATRIX_COLS / 2
-    static bool led[MATRIX_ROWS][MATRIX_COLS];
-
+    static bool     led[MATRIX_ROWS][MID_COL];
     static uint32_t wait_timer = 0;
-    if (wait_timer > g_rgb_timer) {
-        return false;
-    }
 
     inline uint32_t interval(void) {
         return 3000 / scale16by8(qadd8(rgb_matrix_config.speed, 16), 16);
@@ -37,44 +19,40 @@ static bool PIXEL_FRACTAL(effect_params_t* params) {
         rgb_matrix_set_color_all(0, 0, 0);
     }
 
-    RGB rgb = rgb_matrix_hsv_to_rgb(rgb_matrix_config.hsv);
-    for (uint8_t h = 0; h < MATRIX_ROWS; ++h) {
-        for (uint8_t l = 0; l < MID_COL - 1; ++l) { // Light and move left columns outwards
-            if (led[h][l]) {
-                rgb_matrix_set_color(g_led_config.matrix_co[h][l], rgb.r, rgb.g, rgb.b);
-            } else {
-                rgb_matrix_set_color(g_led_config.matrix_co[h][l], 0, 0, 0);
+    RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+    if (g_rgb_timer > wait_timer) {
+        RGB rgb = rgb_matrix_hsv_to_rgb(rgb_matrix_config.hsv);
+        for (uint8_t h = 0; h < MATRIX_ROWS; ++h) {
+            // Light and copy columns outward
+            for (uint8_t l = 0; l < MID_COL - 1; ++l) {
+                if (led[h][l]) {
+                    rgb_matrix_set_color(g_led_config.matrix_co[h][l], rgb.r, rgb.g, rgb.b);
+                    rgb_matrix_set_color(g_led_config.matrix_co[h][MATRIX_COLS - 1 - l], rgb.r, rgb.g, rgb.b);
+                } else {
+                    rgb_matrix_set_color(g_led_config.matrix_co[h][l], 0, 0, 0);
+                    rgb_matrix_set_color(g_led_config.matrix_co[h][MATRIX_COLS - 1 - l], 0, 0, 0);
+                }
+                led[h][l] = led[h][l + 1];
             }
-            led[h][l] = led[h][l + 1];
-        }
 
-        for (uint8_t r = MATRIX_COLS - 1; r > MID_COL; --r) { // Light and move right columns outwards
-            if (led[h][r]) {
-                rgb_matrix_set_color(g_led_config.matrix_co[h][r], rgb.r, rgb.g, rgb.b);
+            // Light both middle columns
+            if (led[h][MID_COL - 1]) {
+                rgb_matrix_set_color(g_led_config.matrix_co[h][MID_COL - 1], rgb.r, rgb.g, rgb.b);
+                rgb_matrix_set_color(g_led_config.matrix_co[h][MATRIX_COLS - MID_COL], rgb.r, rgb.g, rgb.b);
             } else {
-                rgb_matrix_set_color(g_led_config.matrix_co[h][r], 0, 0, 0);
+                rgb_matrix_set_color(g_led_config.matrix_co[h][MID_COL - 1], 0, 0, 0);
+                rgb_matrix_set_color(g_led_config.matrix_co[h][MATRIX_COLS - MID_COL], 0, 0, 0);
             }
-            led[h][r] = led[h][r - 1];
-        }
 
-        // Light both middle columns
-        if (led[h][MID_COL]) {
-            rgb_matrix_set_color(g_led_config.matrix_co[h][MID_COL], rgb.r, rgb.g, rgb.b);
-        } else {
-            rgb_matrix_set_color(g_led_config.matrix_co[h][MID_COL], 0, 0, 0);
-        }
-        if (led[h][MID_COL - 1]) {
-            rgb_matrix_set_color(g_led_config.matrix_co[h][MID_COL - 1], rgb.r, rgb.g, rgb.b);
-        } else {
-            rgb_matrix_set_color(g_led_config.matrix_co[h][MID_COL - 1], 0, 0, 0);
+            // Generate new random fractal column
+            led[h][MID_COL - 1] = (random8() & 3) ? false : true;
         }
 
-        // Generate new random fractal columns
-        led[h][MID_COL] = led[h][MID_COL - 1] = (random8() & 3) ? false : true;
+        wait_timer = g_rgb_timer + interval();
     }
 
-    wait_timer = g_rgb_timer + interval();
-    return false;
+    return rgb_matrix_check_finished_leds(led_max);
 }
 #    endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS
 #endif     // ENABLE_RGB_MATRIX_PIXEL_FRACTAL