From 7cebc6e5383c0a1ba6db84b1008ce48f88f356e6 Mon Sep 17 00:00:00 2001
From: Demon000 <demonsingur@gmail.com>
Date: Wed, 20 Nov 2019 13:24:58 +0100
Subject: [PATCH] davinci: fod: Calculate dim amount based on real brightness

Change-Id: I72b7dd1fca426cc442f9a6fa382f413bbaadfc76
---
 fod/FingerprintInscreen.cpp | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/fod/FingerprintInscreen.cpp b/fod/FingerprintInscreen.cpp
index 1f6c666..93f2049 100644
--- a/fod/FingerprintInscreen.cpp
+++ b/fod/FingerprintInscreen.cpp
@@ -38,8 +38,18 @@
 #define FOD_SENSOR_Y 1931
 #define FOD_SENSOR_SIZE 190
 
+#define BRIGHTNESS_PATH "/sys/class/backlight/panel0-backlight/brightness"
+
 namespace {
 
+template <typename T>
+static T get(const std::string& path, const T& def) {
+    std::ifstream file(path);
+    T result;
+    file >> result;
+    return file.fail() ? def : result;
+}
+
 template <typename T>
 static void set(const std::string& path, const T& value) {
     std::ofstream file(path);
@@ -119,14 +129,17 @@ Return<void> FingerprintInscreen::setLongPressEnabled(bool) {
 }
 
 Return<int32_t> FingerprintInscreen::getDimAmount(int32_t brightness) {
+    int realBrightness = get(BRIGHTNESS_PATH, 0);
     float alpha;
 
-    if (brightness > 62) {
-        alpha = 1.0 - pow(brightness / 255.0 * 430.0 / 600.0, 0.45);
+    if (realBrightness > 500) {
+        alpha = 1.0 - pow(realBrightness / 2047.0 * 430.0 / 600.0, 0.455);
     } else {
-        alpha = 1.0 - pow(brightness / 200.0, 0.45);
+        alpha = 1.0 - pow(realBrightness / 1680.0, 0.455);
     }
 
+    (void) brightness;
+
     return 255 * alpha;
 }