FIX: double-buffer needs to take 'brightness' into account

src/display/Display.h

@@ -35,6 +35,8 @@ private:
 
     Color *buffer = nullptr;
 
+    uint8_t brightness = 10;
+
 public:
 
     Display(uint8_t width, uint8_t height) :
@@ -60,7 +62,6 @@ public:
 
     void setup() {
       leds.begin();
-      leds.setBrightness(8);
       clear();
       flush();
     }
@@ -73,12 +74,12 @@ public:
       }
     }
 
-    void setBrightness(uint8_t brightness) {
-      leds.setBrightness(brightness);
+    void setBrightness(uint8_t value) {
+      brightness = value;
     }
 
-    uint8_t getBrightness() {
-      return leds.getBrightness();
+    uint8_t getBrightness() const {
+      return brightness;
     }
 
     void clear() {
@@ -124,7 +125,11 @@ public:
       if (buffer == nullptr) {
         return;
       }
-      buffer[index] = color;
+      buffer[index] = {
+          (uint8_t) (color.r * brightness >> 8),
+          (uint8_t) (color.g * brightness >> 8),
+          (uint8_t) (color.b * brightness >> 8)
+      };
     }
 
 private:

src/server.cpp

@@ -86,7 +86,7 @@ void web_brighter() {
 }
 
 void web_darker() {
-  setBrightness(max(1, display.getBrightness() - 10));
+  setBrightness(display.getBrightness() - 10);
   redirect();
 }