kitakami-common: light: Always apply RGB brightness scaling

 * Prior to this change, attention and battery lights weren't handled
   in the same way as notification lights. Apply RGB brightness scaling
   for all of those and avoid relying on the frameworks.

Change-Id: Ie4983c67e378382985217a47f3fc425045aa8e0f

light/Light.cpp

@@ -155,35 +155,7 @@ void Light::setBatteryLight(const LightState& state) {
 
 void Light::setNotificationLight(const LightState& state) {
     std::lock_guard<std::mutex> lock(mLock);
-
-    uint32_t brightness, color, rgb[3];
-    LightState localState = state;
-
-    // If a brightness has been applied by the user
-    brightness = (localState.color & 0xff000000) >> 24;
-    if (brightness > 0 && brightness < 255) {
-        // Retrieve each of the RGB colors
-        color = localState.color & 0x00ffffff;
-        rgb[0] = (color >> 16) & 0xff;
-        rgb[1] = (color >> 8) & 0xff;
-        rgb[2] = color & 0xff;
-
-        // Apply the brightness level
-        if (rgb[0] > 0) {
-            rgb[0] = (rgb[0] * brightness) / 0xff;
-        }
-        if (rgb[1] > 0) {
-            rgb[1] = (rgb[1] * brightness) / 0xff;
-        }
-        if (rgb[2] > 0) {
-            rgb[2] = (rgb[2] * brightness) / 0xff;
-        }
-
-        // Update with the new color
-        localState.color = (rgb[0] << 16) + (rgb[1] << 8) + rgb[2];
-    }
-
-    mNotificationState = localState;
+    mNotificationState = state;
     setSpeakerBatteryLightLocked();
 }
 
@@ -208,7 +180,22 @@ void Light::setSpeakerBatteryLightLocked() {
 void Light::setSpeakerLightLocked(const LightState& state) {
     int red, green, blue, blink;
     int onMs, offMs, stepDuration, pauseHi;
-    uint32_t colorRGB = state.color;
+    uint32_t alpha;
+
+    // Extract brightness from AARRGGBB
+    alpha = (state.color >> 24) & 0xff;
+
+    // Retrieve each of the RGB colors
+    red = (state.color >> 16) & 0xff;
+    green = (state.color >> 8) & 0xff;
+    blue = state.color & 0xff;
+
+    // Scale RGB colors if a brightness has been applied by the user
+    if (alpha != 0xff) {
+        red = (red * alpha) / 0xff;
+        green = (green * alpha) / 0xff;
+        blue = (blue * alpha) / 0xff;
+    }
 
     switch (state.flashMode) {
         case Flash::TIMED:
@@ -221,10 +208,6 @@ void Light::setSpeakerLightLocked(const LightState& state) {
             offMs = 0;
             break;
     }
-
-    red = (colorRGB >> 16) & 0xff;
-    green = (colorRGB >> 8) & 0xff;
-    blue = colorRGB & 0xff;
     blink = onMs > 0 && offMs > 0;
 
     // Disable all blinking to start