Add increase contrast filter

app/src/main/java/acr/browser/lightning/fragment/AdvancedSettingsFragment.java

@@ -73,6 +73,9 @@ public class AdvancedSettingsFragment extends LightningPreferenceFragment implem
             case 3:
                 renderingmode.setSummary(getString(R.string.name_inverted_grayscale));
                 break;
+            case 4:
+                renderingmode.setSummary(getString(R.string.name_increase_contrast));
+                break;
         }
 
         textEncoding.setSummary(mPreferenceManager.getTextEncoding());
@@ -135,7 +138,8 @@ public class AdvancedSettingsFragment extends LightningPreferenceFragment implem
         CharSequence[] chars = {mActivity.getString(R.string.name_normal),
                 mActivity.getString(R.string.name_inverted),
                 mActivity.getString(R.string.name_grayscale),
-                mActivity.getString(R.string.name_inverted_grayscale)};
+                mActivity.getString(R.string.name_inverted_grayscale),
+                mActivity.getString(R.string.name_increase_contrast)};
 
         int n = mPreferenceManager.getRenderingMode();
 
@@ -156,6 +160,9 @@ public class AdvancedSettingsFragment extends LightningPreferenceFragment implem
                     case 3:
                         renderingmode.setSummary(getString(R.string.name_inverted_grayscale));
                         break;
+                    case 4:
+                        renderingmode.setSummary(getString(R.string.name_increase_contrast));
+                        break;
                 }
             }
         });

app/src/main/java/acr/browser/lightning/view/LightningView.java

@@ -85,6 +85,12 @@ public class LightningView {
             0, 0, -1.0f, 0, 255, // blue
             0, 0, 0, 1.0f, 0 // alpha
     };
+    private static final float[] mIncreaseContrastColorArray = {
+            2.0f, 0, 0, 0, -160.f, // red
+            0, 2.0f, 0, 0, -160.f, // green
+            0, 0, 2.0f, 0, -160.f, // blue
+            0, 0, 0, 1.0f, 0 // alpha
+    };
     private final WebViewHandler mWebViewHandler = new WebViewHandler(this);
     private final Map<String, String> mRequestHeaders = new ArrayMap<>();
 
@@ -506,6 +512,13 @@ public class LightningView {
                 mInvertPage = true;
                 break;
 
+            case 4:
+                ColorMatrixColorFilter IncreaseHighContrast = new ColorMatrixColorFilter(
+                        mIncreaseContrastColorArray);
+                mPaint.setColorFilter(IncreaseHighContrast);
+                setHardwareRendering();
+                break;
+
         }
 
     }

app/src/main/res/values-ko/strings.xml

@@ -135,6 +135,7 @@
     <string name="name_inverted">반전</string>
     <string name="name_grayscale">그레이스케일</string>
     <string name="name_inverted_grayscale">반전된 그레이스케일</string>
+    <string name="name_increase_contrast">대비 증가</string>
     <string name="name_normal">보통</string>
     <string name="sync_history">Google과 기록 동기화</string>
     <string name="title_file_chooser">파일 선택기</string>

app/src/main/res/values/strings.xml

@@ -175,6 +175,7 @@
     <string name="name_inverted">Inverted</string>
     <string name="name_grayscale">Grayscale</string>
     <string name="name_inverted_grayscale">Inverted Grayscale</string>
+    <string name="name_increase_contrast">Increase Contrast</string>
     <string name="name_normal">Normal</string>
     <string name="sync_history">Sync history with Google</string>
     <string name="title_file_chooser">File Chooser</string>