Added some code to allow inverted and grayscale modes in WebView

src/acr/browser/lightning/LightningView.java

@@ -10,6 +10,9 @@ import android.app.AlertDialog;
 import android.content.*;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
+import android.graphics.ColorMatrix;
+import android.graphics.ColorMatrixColorFilter;
+import android.graphics.Paint;
 import android.net.MailTo;
 import android.net.Uri;
 import android.net.http.SslError;
@@ -35,34 +38,26 @@ import java.net.*;
 public class LightningView {
 
 	private Title mTitle;
-
 	private WebView mWebView;
-
 	private BrowserController mBrowserController;
-
 	private GestureDetector mGestureDetector;
-
 	private Activity mActivity;
-
 	private WebSettings mSettings;
-
 	private static int API = android.os.Build.VERSION.SDK_INT;
-
 	private static String mHomepage;
-
 	private static String mDefaultUserAgent;
-
 	private static Bitmap mWebpageBitmap;
-
 	private static SharedPreferences mPreferences;
-
 	private static boolean mWideViewPort;
-
 	private AdBlock mAdBlock;
-
 	private boolean isForegroundTab;
-
 	private IntentUtils mIntentUtils;
+	private Paint mPaint = new Paint();
+	private static final float[] mNegativeColorArray = { -1.0f, 0, 0, 0, 255, // red
+			0, -1.0f, 0, 0, 255, // green
+			0, 0, -1.0f, 0, 255, // blue
+			0, 0, 0, 1.0f, 0 // alpha
+	};
 
 	@SuppressWarnings("deprecation")
 	@SuppressLint("NewApi")
@@ -88,6 +83,8 @@ public class LightningView {
 		mWebView.setAnimationCacheEnabled(false);
 		mWebView.setDrawingCacheEnabled(true);
 		mWebView.setBackgroundColor(activity.getResources().getColor(android.R.color.white));
+		mWebView.setBackground(null);
+
 		if (API > 15) {
 			mWebView.getRootView().setBackground(null);
 		} else {
@@ -137,12 +134,12 @@ public class LightningView {
 		mSettings = mWebView.getSettings();
 		initializeSettings(mWebView.getSettings(), activity);
 		initializePreferences(activity);
- 
+
 		if (url != null) {
 			if (!url.trim().isEmpty()) {
 				mWebView.loadUrl(url);
 			} else {
-				//don't load anything, the user is looking for a blank tab
+				// don't load anything, the user is looking for a blank tab
 			}
 		} else {
 			if (mHomepage.startsWith("about:home")) {
@@ -160,87 +157,87 @@ public class LightningView {
 		String home;
 		home = HomepageVariables.HEAD;
 		switch (mPreferences.getInt(PreferenceConstants.SEARCH, 1)) {
-		case 0:
+			case 0:
-			// CUSTOM SEARCH
+				// CUSTOM SEARCH
-			home = home + "file:///android_asset/lightning.png";
+				home = home + "file:///android_asset/lightning.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home
+				home = home
-					+ mPreferences.getString(PreferenceConstants.SEARCH_URL,
+						+ mPreferences.getString(PreferenceConstants.SEARCH_URL,
-							Constants.GOOGLE_SEARCH);
+								Constants.GOOGLE_SEARCH);
-			break;
+				break;
-		case 1:
+			case 1:
-			// GOOGLE_SEARCH;
+				// GOOGLE_SEARCH;
-			home = home + "file:///android_asset/google.png";
+				home = home + "file:///android_asset/google.png";
-			// + "https://www.google.com/images/srpr/logo11w.png";
+				// + "https://www.google.com/images/srpr/logo11w.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.GOOGLE_SEARCH;
+				home = home + Constants.GOOGLE_SEARCH;
-			break;
+				break;
-		case 2:
+			case 2:
-			// ANDROID SEARCH;
+				// ANDROID SEARCH;
-			home = home + "file:///android_asset/lightning.png";
+				home = home + "file:///android_asset/lightning.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.ANDROID_SEARCH;
+				home = home + Constants.ANDROID_SEARCH;
-			break;
+				break;
-		case 3:
+			case 3:
-			// BING_SEARCH;
+				// BING_SEARCH;
-			home = home + "file:///android_asset/bing.png";
+				home = home + "file:///android_asset/bing.png";
-			// +
+				// +
-			// "http://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Bing_logo_%282013%29.svg/500px-Bing_logo_%282013%29.svg.png";
+				// "http://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Bing_logo_%282013%29.svg/500px-Bing_logo_%282013%29.svg.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.BING_SEARCH;
+				home = home + Constants.BING_SEARCH;
-			break;
+				break;
-		case 4:
+			case 4:
-			// YAHOO_SEARCH;
+				// YAHOO_SEARCH;
-			home = home + "file:///android_asset/yahoo.png";
+				home = home + "file:///android_asset/yahoo.png";
-			// +
+				// +
-			// "http://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Yahoo%21_logo.svg/799px-Yahoo%21_logo.svg.png";
+				// "http://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Yahoo%21_logo.svg/799px-Yahoo%21_logo.svg.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.YAHOO_SEARCH;
+				home = home + Constants.YAHOO_SEARCH;
-			break;
+				break;
-		case 5:
+			case 5:
-			// STARTPAGE_SEARCH;
+				// STARTPAGE_SEARCH;
-			home = home + "file:///android_asset/startpage.png";
+				home = home + "file:///android_asset/startpage.png";
-			// + "https://startpage.com/graphics/startp_logo.gif";
+				// + "https://startpage.com/graphics/startp_logo.gif";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.STARTPAGE_SEARCH;
+				home = home + Constants.STARTPAGE_SEARCH;
-			break;
+				break;
-		case 6:
+			case 6:
-			// STARTPAGE_MOBILE
+				// STARTPAGE_MOBILE
-			home = home + "file:///android_asset/startpage.png";
+				home = home + "file:///android_asset/startpage.png";
-			// + "https://startpage.com/graphics/startp_logo.gif";
+				// + "https://startpage.com/graphics/startp_logo.gif";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.STARTPAGE_MOBILE_SEARCH;
+				home = home + Constants.STARTPAGE_MOBILE_SEARCH;
-		case 7:
+			case 7:
-			// DUCK_SEARCH;
+				// DUCK_SEARCH;
-			home = home + "file:///android_asset/duckduckgo.png";
+				home = home + "file:///android_asset/duckduckgo.png";
-			// +
+				// +
-			// "https://duckduckgo.com/assets/logo_homepage.normal.v101.png";
+				// "https://duckduckgo.com/assets/logo_homepage.normal.v101.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.DUCK_SEARCH;
+				home = home + Constants.DUCK_SEARCH;
-			break;
+				break;
-		case 8:
+			case 8:
-			// DUCK_LITE_SEARCH;
+				// DUCK_LITE_SEARCH;
-			home = home + "file:///android_asset/duckduckgo.png";
+				home = home + "file:///android_asset/duckduckgo.png";
-			// +
+				// +
-			// "https://duckduckgo.com/assets/logo_homepage.normal.v101.png";
+				// "https://duckduckgo.com/assets/logo_homepage.normal.v101.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.DUCK_LITE_SEARCH;
+				home = home + Constants.DUCK_LITE_SEARCH;
-			break;
+				break;
-		case 9:
+			case 9:
-			// BAIDU_SEARCH;
+				// BAIDU_SEARCH;
-			home = home + "file:///android_asset/baidu.png";
+				home = home + "file:///android_asset/baidu.png";
-			// + "http://www.baidu.com/img/bdlogo.gif";
+				// + "http://www.baidu.com/img/bdlogo.gif";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.BAIDU_SEARCH;
+				home = home + Constants.BAIDU_SEARCH;
-			break;
+				break;
-		case 10:
+			case 10:
-			// YANDEX_SEARCH;
+				// YANDEX_SEARCH;
-			home = home + "file:///android_asset/yandex.png";
+				home = home + "file:///android_asset/yandex.png";
-			// +
+				// +
-			// "http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Yandex.svg/600px-Yandex.svg.png";
+				// "http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/Yandex.svg/600px-Yandex.svg.png";
-			home = home + HomepageVariables.MIDDLE;
+				home = home + HomepageVariables.MIDDLE;
-			home = home + Constants.YANDEX_SEARCH;
+				home = home + Constants.YANDEX_SEARCH;
-			break;
+				break;
 
 		}
 
@@ -273,38 +270,38 @@ public class LightningView {
 				.getBoolean(PreferenceConstants.LOCATION, false));
 		if (API < 19) {
 			switch (mPreferences.getInt(PreferenceConstants.ADOBE_FLASH_SUPPORT, 0)) {
-			case 0:
+				case 0:
-				mSettings.setPluginState(PluginState.OFF);
+					mSettings.setPluginState(PluginState.OFF);
-				break;
+					break;
+				case 1:
+					mSettings.setPluginState(PluginState.ON_DEMAND);
+					break;
+				case 2:
+					mSettings.setPluginState(PluginState.ON);
+					break;
+				default:
+					break;
+			}
+		}
+
+		switch (mPreferences.getInt(PreferenceConstants.USER_AGENT, 1)) {
 			case 1:
-				mSettings.setPluginState(PluginState.ON_DEMAND);
+				if (API > 16) {
+					mSettings.setUserAgentString(WebSettings.getDefaultUserAgent(context));
+				} else {
+					mSettings.setUserAgentString(mDefaultUserAgent);
+				}
 				break;
 			case 2:
-				mSettings.setPluginState(PluginState.ON);
+				mSettings.setUserAgentString(Constants.DESKTOP_USER_AGENT);
 				break;
-			default:
+			case 3:
+				mSettings.setUserAgentString(Constants.MOBILE_USER_AGENT);
+				break;
+			case 4:
+				mSettings.setUserAgentString(mPreferences.getString(
+						PreferenceConstants.USER_AGENT_STRING, mDefaultUserAgent));
 				break;
-			}
-		}
-
-		switch (mPreferences.getInt(PreferenceConstants.USER_AGENT, 1)) {
-		case 1:
-			if (API > 16) {
-				mSettings.setUserAgentString(WebSettings.getDefaultUserAgent(context));
-			} else {
-				mSettings.setUserAgentString(mDefaultUserAgent);
-			}
-			break;
-		case 2:
-			mSettings.setUserAgentString(Constants.DESKTOP_USER_AGENT);
-			break;
-		case 3:
-			mSettings.setUserAgentString(Constants.MOBILE_USER_AGENT);
-			break;
-		case 4:
-			mSettings.setUserAgentString(mPreferences.getString(
-					PreferenceConstants.USER_AGENT_STRING, mDefaultUserAgent));
-			break;
 		}
 
 		if (mPreferences.getBoolean(PreferenceConstants.SAVE_PASSWORDS, false)) {
@@ -337,27 +334,28 @@ public class LightningView {
 		mSettings.setLoadWithOverviewMode(mPreferences.getBoolean(
 				PreferenceConstants.OVERVIEW_MODE, true));
 		switch (mPreferences.getInt(PreferenceConstants.TEXT_SIZE, 3)) {
-		case 1:
+			case 1:
-			mSettings.setTextZoom(200);
+				mSettings.setTextZoom(200);
-			break;
+				break;
-		case 2:
+			case 2:
-			mSettings.setTextZoom(150);
+				mSettings.setTextZoom(150);
-			break;
+				break;
-		case 3:
+			case 3:
-			mSettings.setTextZoom(100);
+				mSettings.setTextZoom(100);
-			break;
+				break;
-		case 4:
+			case 4:
-			mSettings.setTextZoom(75);
+				mSettings.setTextZoom(75);
-			break;
+				break;
-		case 5:
+			case 5:
-			mSettings.setTextZoom(50);
+				mSettings.setTextZoom(50);
-			break;
+				break;
 		}
 	}
 
 	@SuppressWarnings("deprecation")
 	@SuppressLint({ "SetJavaScriptEnabled", "NewApi" })
 	public void initializeSettings(WebSettings settings, Context context) {
+		this.setNormalRendering();
 		if (API < 18) {
 			settings.setAppCacheMaxSize(Long.MAX_VALUE);
 		}
@@ -427,6 +425,33 @@ public class LightningView {
 		}
 	}
 
+	public void setHardwareRendering() {
+		mWebView.setLayerType(View.LAYER_TYPE_HARDWARE, mPaint);
+	}
+
+	public void setNormalRendering() {
+		mWebView.setLayerType(View.LAYER_TYPE_NONE, mPaint);
+	}
+
+	public void setColorMode(int mode) {
+		switch (mode) {
+			case 0:
+				mPaint.setColorFilter(null);
+				break;
+			case 1:
+				ColorMatrixColorFilter filterInvert = new ColorMatrixColorFilter(
+						mNegativeColorArray);
+				mPaint.setColorFilter(filterInvert);
+				break;
+			case 2:
+				ColorMatrix cm = new ColorMatrix();
+				cm.setSaturation(0);
+				ColorMatrixColorFilter filterGray = new ColorMatrixColorFilter(cm);
+				mPaint.setColorFilter(filterGray);
+				break;
+		}
+	}
+
 	public synchronized void pauseTimers() {
 		if (mWebView != null) {
 			mWebView.pauseTimers();