Add color correction level API to native

Test: Locally tested with other cls of the same topic, and also added unit tests and ran 'atest SurfaceFlinger_test'
Bug: 322829049

Change-Id: I494ce39608ddf84fb74b60291511477672ca4e36
diff --git a/services/surfaceflinger/Effects/Daltonizer.h b/services/surfaceflinger/Effects/Daltonizer.h
index 2fb60e9..f5eaae7 100644
--- a/services/surfaceflinger/Effects/Daltonizer.h
+++ b/services/surfaceflinger/Effects/Daltonizer.h
@@ -21,6 +21,9 @@
 
 namespace android {
 
+// Forward declare test class
+class DaltonizerTest;
+
 enum class ColorBlindnessType {
     None,               // Disables the Daltonizer
     Protanomaly,        // L (red) cone deficient
@@ -37,10 +40,15 @@
 public:
     void setType(ColorBlindnessType type);
     void setMode(ColorBlindnessMode mode);
+    // sets level for correction saturation, [0-10].
+    void setLevel(int32_t level);
 
     // returns the color transform to apply in the shader
     const mat4& operator()();
 
+    // For testing.
+    friend class DaltonizerTest;
+
 private:
     void update();
 
@@ -48,6 +56,8 @@
     ColorBlindnessMode mMode = ColorBlindnessMode::Simulation;
     bool mDirty = true;
     mat4 mColorTransform;
+    // level of error spreading, [0.0-1.0].
+    float mLevel = 0.7f;
 };
 
 } /* namespace android */