Bug 783092: LightweightTheme support in Fennec. [r=mfinkle]

--HG--
extra : rebase_source : 61d66ba4c9a36616156edbbb311670916e2ad23b

mobile/android/base/CanvasDelegate.java

@@ -10,6 +10,7 @@ import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.PorterDuffXfermode;
 import android.graphics.PorterDuff.Mode;
+import android.graphics.Shader;
 import android.os.Build;
 
 public class CanvasDelegate { 
@@ -68,4 +69,8 @@ public class CanvasDelegate {
         // Restore the canvas.
         canvas.restoreToCount(count);
     }
+
+    public void setShader(Shader shader) {
+        mPaint.setShader(shader);
+    }
 }

mobile/android/base/GeckoActivity.java.in

@@ -40,4 +40,8 @@ public class GeckoActivity extends Activity {
         MemoryMonitor.getInstance().onTrimMemory(level);
         super.onTrimMemory(level);
     }
+
+    public LightweightTheme getLightweightTheme() {
+        return ((GeckoApplication) getApplication()).getLightweightTheme();
+    }
 }

mobile/android/base/GeckoApplication.java

@@ -13,6 +13,8 @@ public class GeckoApplication extends Application {
     private boolean mInited;
     private boolean mInBackground;
 
+    private LightweightTheme mLightweightTheme;
+
     protected void initialize() {
         if (mInited)
             return;
@@ -22,6 +24,8 @@ public class GeckoApplication extends Application {
             Class.forName("android.os.AsyncTask");
         } catch (ClassNotFoundException e) {}
 
+        mLightweightTheme = new LightweightTheme(this);
+
         GeckoConnectivityReceiver.getInstance().init(getApplicationContext());
         GeckoBatteryManager.getInstance().init(getApplicationContext());
         GeckoBatteryManager.getInstance().start();
@@ -50,4 +54,8 @@ public class GeckoApplication extends Application {
     public boolean isApplicationInBackground() {
         return mInBackground;
     }
+
+    public LightweightTheme getLightweightTheme() {
+        return mLightweightTheme;
+    }
 }

mobile/android/base/LightweightTheme.java

@@ -0,0 +1,285 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko;
+
+import org.mozilla.gecko.gfx.BitmapUtils;
+import org.mozilla.gecko.util.GeckoEventListener;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import android.app.Application;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.LayerDrawable;
+import android.graphics.Rect;
+import android.graphics.Shader;
+import android.os.Build;
+import android.util.DisplayMetrics;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewParent;
+
+import java.net.URL;
+import java.net.URLConnection;
+import java.io.InputStream;
+import java.util.List;
+import java.util.ArrayList;
+
+import android.util.Log;
+
+public class LightweightTheme implements GeckoEventListener {
+    private static final String LOGTAG = "GeckoLightweightTheme";
+
+    private Application mApplication;
+    private Bitmap mBitmap;
+    private int mColor;
+
+    public static interface OnChangeListener {
+        // This is the View's default post.
+        // This is required to post the change/rest on UI thread.
+        public boolean post(Runnable action);
+
+        // The View should change its background/text color. 
+        public void onLightweightThemeChanged();
+
+        // The View should reset to its default background/text color.
+        public void onLightweightThemeReset();
+    }
+
+    private List<OnChangeListener> mListeners;
+    
+    public LightweightTheme(Application application) {
+        mApplication = application;
+        mListeners = new ArrayList<OnChangeListener>();
+
+        GeckoAppShell.getEventDispatcher().registerEventListener("LightweightTheme:Update", this);
+        GeckoAppShell.getEventDispatcher().registerEventListener("LightweightTheme:Disable", this);
+    }
+
+    public void addListener(final OnChangeListener listener) {
+        // Don't inform the listeners that attached late.
+        // Their onLayout() will take care of them before their onDraw();
+        mListeners.add(listener);
+    }
+
+    public void removeListener(OnChangeListener listener) {
+        mListeners.remove(listener);
+    }
+
+    public void setLightweightTheme(String headerURL) {
+        try {
+            // Wait till gecko downloads and gives us the file, don't download.
+            if (headerURL.indexOf("http") != -1)
+                return;
+
+            // Get the image and convert it to a bitmap.
+            URL url = new URL(headerURL);
+            InputStream stream = url.openStream();
+            mBitmap = BitmapFactory.decodeStream(stream);
+            stream.close();
+
+            // To find the dominant color only once, take the bottom 25% of pixels.
+            DisplayMetrics dm = mApplication.getResources().getDisplayMetrics();
+            int maxWidth = Math.max(dm.widthPixels, dm.heightPixels);
+            int height = (int) (mBitmap.getHeight() * 0.25);
+            Bitmap cropped = Bitmap.createBitmap(mBitmap, mBitmap.getWidth() - maxWidth,
+                                                          mBitmap.getHeight() - height, 
+                                                          maxWidth, height);
+            mColor = BitmapUtils.getDominantColor(cropped, false);
+            cropped.recycle();
+
+            notifyListeners();
+        } catch(java.net.MalformedURLException e) {
+            mBitmap = null;
+        } catch(java.io.IOException e) {
+            mBitmap = null;
+        }
+    }
+
+    public void resetLightweightTheme() {
+        // Reset the bitmap.
+        mBitmap = null;
+
+        // Post the reset on the UI thread.
+        for (OnChangeListener listener : mListeners) {
+             final OnChangeListener oneListener = listener;
+             oneListener.post(new Runnable() {
+                 @Override
+                 public void run() {
+                     oneListener.onLightweightThemeReset();
+                 }
+             });
+        }
+    }
+
+    public void notifyListeners() {
+        if (mBitmap == null)
+            return;
+
+        // Post the change on the UI thread.
+        for (OnChangeListener listener : mListeners) {
+             final OnChangeListener oneListener = listener;
+             oneListener.post(new Runnable() {
+                 @Override
+                 public void run() {
+                     oneListener.onLightweightThemeChanged();
+                 }
+             });
+        }
+    }
+
+    @Override
+    public void handleMessage(String event, JSONObject message) {
+        try {
+            if (event.equals("LightweightTheme:Update")) {
+                JSONObject lightweightTheme = message.getJSONObject("data");
+                String headerURL = lightweightTheme.getString("headerURL"); 
+                int mark = headerURL.indexOf('?');
+                if (mark != -1)
+                    headerURL = headerURL.substring(0, mark);
+                setLightweightTheme(headerURL);
+            } else if (event.equals("LightweightTheme:Disable")) {
+                resetLightweightTheme();
+            }
+        } catch (Exception e) {
+            Log.e(LOGTAG, "Exception handling message \"" + event + "\":", e);
+        }
+    }
+
+    /**
+     * Crop the image based on the position of the view on the window.
+     * Either the View or one of its ancestors might have scrolled or translated.
+     * This value should be taken into account while mapping the View to the Bitmap.
+     *
+     * @param view The view requesting a cropped bitmap.
+     */
+    private Bitmap getCroppedBitmap(View view) {
+        if (mBitmap == null || view == null)
+            return null;
+
+        // Get the global position of the view on the entire screen.
+        Rect rect = new Rect();
+        view.getGlobalVisibleRect(rect);
+
+        // Get the activity's window position. This does an IPC call, may be expensive.
+        Rect window = new Rect();
+        view.getWindowVisibleDisplayFrame(window);
+
+        // Calculate the coordinates for the cropped bitmap.
+        int screenWidth = view.getContext().getResources().getDisplayMetrics().widthPixels;
+        int left = mBitmap.getWidth() - screenWidth + rect.left;
+        int right = mBitmap.getWidth() - screenWidth + rect.right;
+        int top = rect.top - window.top;
+        int bottom = rect.bottom - window.top;
+
+        int offsetX = 0;
+        int offsetY = 0;
+
+        // Find if this view or any of its ancestors has been translated or scrolled.
+        ViewParent parent;
+        View curView = view;
+        do {
+            if (Build.VERSION.SDK_INT >= 11) {
+                offsetX += (int) curView.getTranslationX() - curView.getScrollX();
+                offsetY += (int) curView.getTranslationY() - curView.getScrollY();
+            } else {
+                offsetX -= curView.getScrollX();
+                offsetY -= curView.getScrollY();
+            }
+
+            parent = curView.getParent();
+
+            if (parent instanceof View)
+                curView = (View) parent;
+
+        } while(parent instanceof View && parent != null);
+
+        // Adjust the coordinates for the offset.
+        left -= offsetX;
+        right -= offsetX;
+        top -= offsetY;
+        bottom -= offsetY;
+
+        // The either the required height may be less than the available image height or more than it.
+        // If the height required is more, crop only the available portion on the image.
+        int width = right - left;
+        int height = (bottom > mBitmap.getHeight() ? mBitmap.getHeight() - top : bottom - top);
+
+        // There is a chance that the view is not visible or doesn't fall within the phone's size.
+        // In this case, 'rect' will have all values as '0'. Hence 'top' and 'bottom' may be negative,
+        // and createBitmap() will fail.
+        // The view will get a background in its next layout pass.
+        try {
+            return Bitmap.createBitmap(mBitmap, left, top, width, height);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    /**
+     * Converts the cropped bitmap to a BitmapDrawable and returns the same.
+     *
+     * @param view The view for which a background drawable is required.
+     * @return Either the cropped bitmap as a Drawable or null.
+     */
+    public Drawable getDrawable(View view) {
+        Bitmap bitmap = getCroppedBitmap(view);
+        if (bitmap == null)
+            return null;
+
+        BitmapDrawable drawable = new BitmapDrawable(view.getContext().getResources(), bitmap);
+        drawable.setGravity(Gravity.TOP|Gravity.RIGHT);
+        drawable.setTileModeXY(Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
+        return drawable;
+    }
+
+    /**
+     * Converts the cropped bitmap to a LightweightThemeDrawable, with the required alpha.
+     * LightweightThemeDrawable is optionally placed over a ColorDrawable (of dominant color),
+     * if the cropped bitmap cannot fill the entire view.
+     *
+     * @param view The view for which a background drawable is required.
+     * @param alpha The alpha (0..255) value to be applied to the Drawable.
+     * @return Either the cropped bitmap as a Drawable or null.
+     */
+    public Drawable getDrawableWithAlpha(View view, int alpha) {
+        return getDrawableWithAlpha(view, alpha, alpha);
+    }
+
+    /**
+     * Converts the cropped bitmap to a LightweightThemeDrawable, with the required alpha applied as 
+     * a LinearGradient. LightweightThemeDrawable is optionally placed over a ColorDrawable 
+     * (of dominant color), if the cropped bitmap cannot fill the entire view.
+     *
+     * @param view The view for which a background drawable is required.
+     * @param startAlpha The top alpha (0..255) of the linear gradient to be applied to the Drawable.
+     * @param endAlpha The bottom alpha (0..255) of the linear gradient to be applied to the Drawable.
+     * @return Either the cropped bitmap as a Drawable or null.
+     */
+    public Drawable getDrawableWithAlpha(View view, int startAlpha, int endAlpha) {
+        Bitmap bitmap = getCroppedBitmap(view);
+        if (bitmap == null)
+            return null;
+
+        LightweightThemeDrawable drawable = new LightweightThemeDrawable(view.getContext().getResources(), bitmap);
+        drawable.setAlpha(startAlpha, endAlpha);
+        drawable.setGravity(Gravity.TOP|Gravity.RIGHT|Gravity.FILL_HORIZONTAL);
+
+        if (bitmap.getHeight() != view.getHeight()) {
+            ColorDrawable colorDrawable = new ColorDrawable(mColor);
+            LayerDrawable layerDrawable = new LayerDrawable(new Drawable[]{ colorDrawable, drawable });
+            return layerDrawable;
+        } else {
+            return drawable;
+        }
+    }
+}

mobile/android/base/LightweightThemeDrawable.java

@@ -0,0 +1,59 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko;
+
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.LinearGradient;
+import android.graphics.Path;
+import android.graphics.PorterDuff.Mode;
+import android.graphics.Rect;
+import android.graphics.Shader;
+
+public class LightweightThemeDrawable extends BitmapDrawable
+                                      implements CanvasDelegate.DrawManager { 
+    private static final String LOGTAG = "GeckoLightweightThemeDrawable";
+    private Path mPath;
+    private CanvasDelegate mCanvasDelegate;
+    private Bitmap mBitmap;
+    private int mStartColor;
+    private int mEndColor;
+
+    public LightweightThemeDrawable(Resources resources, Bitmap bitmap) {
+        super(resources, bitmap);
+        mBitmap = bitmap;
+
+        mPath = new Path();
+        mCanvasDelegate = new CanvasDelegate(this, Mode.DST_IN);
+    }
+
+    public void setAlpha(int startAlpha, int endAlpha) {
+        mStartColor = startAlpha << 24;
+        mEndColor = endAlpha << 24;
+    }
+
+    @Override
+    protected void onBoundsChange(Rect bounds) {
+        mCanvasDelegate.setShader(new LinearGradient(0, 0, 
+                                                     0, mBitmap.getHeight(), 
+                                                     mStartColor, mEndColor,
+                                                     Shader.TileMode.CLAMP));
+
+        mPath.addRect(0, 0, mBitmap.getWidth(), mBitmap.getHeight(), Path.Direction.CW);
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        mCanvasDelegate.draw(canvas, mPath, canvas.getWidth(), canvas.getHeight());
+    }
+
+    @Override
+    public void defaultDraw(Canvas canvas) {
+        super.draw(canvas);
+    }
+}

mobile/android/base/Makefile.in

@@ -92,6 +92,8 @@ FENNEC_JAVA_FILES = \
   GeckoViewsFactory.java \
   HeightChangeAnimation.java \
   InputMethods.java \
+  LightweightTheme.java \
+  LightweightThemeDrawable.java \
   LinkPreference.java \
   LinkTextView.java \
   MemoryMonitor.java \

mobile/android/base/gfx/BitmapUtils.java

@@ -10,6 +10,10 @@ import android.graphics.Color;
 
 public final class BitmapUtils {
     public static int getDominantColor(Bitmap source) {
+        return getDominantColor(source, true);
+    }
+
+    public static int getDominantColor(Bitmap source, boolean applyThreshold) {
       int[] colors = new int[37];
       int[] sat = new int[11];
       int[] val = new int[11];
@@ -29,15 +33,18 @@ public final class BitmapUtils {
           Color.colorToHSV(c, hsv);
 
           // arbitrarily chosen values for "white" and "black"
-          if (hsv[1] > 0.35f && hsv[2] > 0.35f) {
+          if (applyThreshold && hsv[1] <= 0.35f && hsv[2] <= 0.35f)
+            continue;
+
           int h = Math.round(hsv[0] / 10.0f);
           int s = Math.round(hsv[1] * 10.0f);
           int v = Math.round(hsv[2] * 10.0f);
           colors[h]++;
           sat[s]++;
           val[v]++;
-            // we only care about the most unique non white or black hue, but also
-            // store its saturation and value params to match the color better
+
+          // we only care about the most unique non white or black hue - if threshold is applied
+          // we also store its saturation and value params to match the color better
           if (colors[h] > colors[maxH]) {
             maxH = h;
             maxS = s;
@@ -45,7 +52,6 @@ public final class BitmapUtils {
           }
         }
       }
-      }
       float[] hsv = new float[3];
       hsv[0] = maxH*10.0f;
       hsv[1] = (float)maxS/10.0f;