Fixed dull generated icons

app/src/main/java/eu/faircode/email/Helper.java

@@ -32,6 +32,7 @@ import android.content.pm.ResolveInfo;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
+import android.graphics.Color;
 import android.graphics.Matrix;
 import android.hardware.biometrics.BiometricManager;
 import android.hardware.fingerprint.FingerprintManager;
@@ -66,6 +67,7 @@ import androidx.biometric.BiometricPrompt;
 import androidx.browser.customtabs.CustomTabsIntent;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.core.content.ContextCompat;
+import androidx.core.graphics.ColorUtils;
 import androidx.exifinterface.media.ExifInterface;
 import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
@@ -340,6 +342,15 @@ public class Helper {
         return (tv.string != null && !"light".contentEquals(tv.string));
     }
 
+    static int adjustLuminance(int color, boolean dark, float min) {
+        float lum = (float) ColorUtils.calculateLuminance(color);
+        if (dark ? lum < min : lum > 1 - min)
+            return ColorUtils.blendARGB(color,
+                    dark ? Color.WHITE : Color.BLACK,
+                    dark ? min - lum : lum - (1 - min));
+        return color;
+    }
+
     // Formatting
 
     static String humanReadableByteCount(long bytes, boolean si) {

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -45,7 +45,6 @@ import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.core.graphics.ColorUtils;
 import androidx.core.text.HtmlCompat;
 import androidx.core.util.PatternsCompat;
 import androidx.preference.PreferenceManager;
@@ -211,11 +210,7 @@ public class HtmlHelper {
                                 }
 
                                 if (color != null) {
-                                    float lum = (float) ColorUtils.calculateLuminance(color);
-                                    if (dark ? lum < MIN_LUMINANCE : lum > 1 - MIN_LUMINANCE)
-                                        color = ColorUtils.blendARGB(color,
-                                                dark ? Color.WHITE : Color.BLACK,
-                                                dark ? MIN_LUMINANCE - lum : lum - (1 - MIN_LUMINANCE));
+                                    color = Helper.adjustLuminance(color, dark, MIN_LUMINANCE);
                                     c = String.format("#%06x", color & 0xFFFFFF);
                                     sb.append("color:").append(c).append(";");
 

app/src/main/java/eu/faircode/email/Identicon.java

@@ -39,8 +39,7 @@ class Identicon {
         byte[] hash = getHash(email);
 
         int color = Color.argb(255, hash[0], hash[1], hash[2]);
-        color = ColorUtils.blendARGB(color,
-                dark ? Color.WHITE : Color.BLACK, MIN_LUMINANCE);
+        color = Helper.adjustLuminance(color, dark, MIN_LUMINANCE);
 
         Paint paint = new Paint();
         paint.setColor(color);
@@ -79,7 +78,7 @@ class Identicon {
         byte[] hash = getHash(email);
 
         int color = Color.argb(255, hash[0], hash[1], hash[2]);
-        color = ColorUtils.blendARGB(color, dark ? Color.WHITE : Color.BLACK, MIN_LUMINANCE);
+        color = Helper.adjustLuminance(color, dark, MIN_LUMINANCE);
 
         Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
         Canvas canvas = new Canvas(bitmap);