Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/scene_layer/ReaderModeSceneLayer.java

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.compositor.scene_layer;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.JNINamespace;
+import org.chromium.chrome.browser.dom_distiller.ReaderModePanel;
+import org.chromium.content.browser.ContentViewCore;
+import org.chromium.ui.resources.ResourceManager;
+
+/**
+ * A SceneLayer to render layers for ReaderModeLayout.
+ */
+@JNINamespace("chrome::android")
+public class ReaderModeSceneLayer extends SceneLayer {
+
+    // NOTE: If you use SceneLayer's native pointer here, the JNI generator will try to
+    // downcast using reinterpret_cast<>. We keep a separate pointer to avoid it.
+    private long mNativePtr;
+
+    private final float mDpToPx;
+
+    public ReaderModeSceneLayer(float dpToPx) {
+        mDpToPx = dpToPx;
+    }
+
+    /**
+     * Update reader mode's layer tree using the parameters.
+     *
+     * @param panel
+     * @param resourceManager
+     */
+    public void update(ReaderModePanel panel, ResourceManager resourceManager) {
+        if (panel == null) return;
+        if (!panel.isShowing()) return;
+
+        nativeUpdateReaderModeLayer(mNativePtr,
+                R.drawable.reader_mode_bar_background, R.id.reader_mode_view,
+                panel.didFirstNonEmptyDistilledPaint() ? panel.getDistilledContentViewCore() : null,
+                panel.getPanelY() * mDpToPx,
+                panel.getWidth() * mDpToPx,
+                panel.getMarginTop() * mDpToPx,
+                panel.getPanelHeight() * mDpToPx,
+                panel.getDistilledContentY() * mDpToPx,
+                panel.getDistilledHeight() * mDpToPx,
+                panel.getX() * mDpToPx,
+                panel.getTextOpacity(),
+                panel.getReaderModeHeaderBackgroundColor(),
+                resourceManager);
+    }
+
+    @Override
+    protected void initializeNative() {
+        if (mNativePtr == 0) {
+            mNativePtr = nativeInit();
+        }
+        assert mNativePtr != 0;
+    }
+
+    /**
+     * Destroys this object and the corresponding native component.
+     */
+    @Override
+    public void destroy() {
+        super.destroy();
+        mNativePtr = 0;
+    }
+
+    private native long nativeInit();
+    private native void nativeUpdateReaderModeLayer(long nativeReaderModeSceneLayer,
+            int panelBackgroundResourceId, int panelTextResourceId,
+            ContentViewCore readerModeContentViewCore,
+            float panelY, float panelWidth, float panelMarginTop, float panelHeight,
+            float distilledY, float distilledHeight,
+            float x,
+            float panelTextOpacity, int headerBackgroundColor,
+            ResourceManager resourceManager);
+}