Merge java_staging/src into java/src.

chrome/android/java_staging/src/org/chromium/chrome/browser/tab/ThumbnailTabHelper.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/tab/ThumbnailTabHelper.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/tab/ThumbnailTabHelper.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/tab/ThumbnailTabHelper.java
deleted file mode 100644
index f85cccf2bc0b9ba40ccf1087a3632276c74c702b..0000000000000000000000000000000000000000
--- a/chrome/android/java_staging/src/org/chromium/chrome/browser/tab/ThumbnailTabHelper.java
+++ /dev/null
@@ -1,334 +0,0 @@
-// 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.tab;
-
-import android.content.res.Resources;
-import android.graphics.Bitmap;
-import android.graphics.Bitmap.Config;
-import android.graphics.Canvas;
-import android.graphics.Paint;
-import android.graphics.Rect;
-import android.os.Handler;
-import android.text.TextUtils;
-import android.util.Log;
-
-import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ChromeActivity;
-import org.chromium.chrome.browser.EmptyTabObserver;
-import org.chromium.chrome.browser.Tab;
-import org.chromium.chrome.browser.TabObserver;
-import org.chromium.chrome.browser.UrlConstants;
-import org.chromium.chrome.browser.profiles.Profile;
-import org.chromium.chrome.browser.util.MathUtils;
-import org.chromium.content.browser.ContentReadbackHandler;
-import org.chromium.content.browser.ContentViewCore;
-import org.chromium.content_public.browser.GestureStateListener;
-import org.chromium.content_public.browser.WebContents;
-import org.chromium.ui.base.WindowAndroid;
-
-/**
- * Handles capturing most visited thumbnails for a tab.
- */
-public class ThumbnailTabHelper {
-
-    private static final String TAG = "ThumbnailTabHelper";
-
-    /** The general motivation for this value is giving the scrollbar fadeout
-     *  animation sufficient time to finish before the capture executes. */
-    private static final int THUMBNAIL_CAPTURE_DELAY_MS = 350;
-
-    private final Tab mTab;
-    private final Handler mHandler;
-
-    private final int mThumbnailWidth;
-    private final int mThumbnailHeight;
-
-    private ContentViewCore mContentViewCore;
-    private boolean mThumbnailCapturedForLoad;
-    private boolean mIsRenderViewHostReady;
-    private boolean mWasRenderViewHostReady;
-
-    private final Runnable mThumbnailRunnable = new Runnable() {
-        @Override
-        public void run() {
-            // http://crbug.com/461506 : Do not get thumbnail unless render view host is ready.
-            if (!mIsRenderViewHostReady) return;
-
-            if (mThumbnailCapturedForLoad) return;
-            // Prevent redundant thumbnail capture attempts.
-            mThumbnailCapturedForLoad = true;
-            if (!canUpdateHistoryThumbnail()) {
-                // Allow a hidden tab to re-attempt capture in the future via |show()|.
-                mThumbnailCapturedForLoad = !mTab.isHidden();
-                return;
-            }
-            if (!shouldUpdateThumbnail()) return;
-
-            // Scale the image so we're not copying more than we need to (from
-            // the GPU).
-            int[] dim = new int[] {
-                mTab.getWidth(), mTab.getHeight()
-            };
-            MathUtils.scaleToFitTargetSize(dim, mThumbnailWidth, mThumbnailHeight);
-
-            ContentReadbackHandler readbackHandler = getActivity().getContentReadbackHandler();
-            if (readbackHandler == null || mTab.getContentViewCore() == null) return;
-            final String requestedUrl = mTab.getUrl();
-            ContentReadbackHandler.GetBitmapCallback bitmapCallback =
-                    new ContentReadbackHandler.GetBitmapCallback() {
-                        @Override
-                        public void onFinishGetBitmap(Bitmap bitmap, int response) {
-                            // Ensure that the URLs match for the requested page, and ensure
-                            // that the page is still valid for thumbnail capturing (i.e.
-                            // not showing an error page).
-                            if (bitmap == null
-                                    || !TextUtils.equals(requestedUrl, mTab.getUrl())
-                                    || !mThumbnailCapturedForLoad
-                                    || !canUpdateHistoryThumbnail()) {
-                                return;
-                            }
-                            updateHistoryThumbnail(bitmap);
-                            bitmap.recycle();
-                        }
-                    };
-            readbackHandler.getContentBitmapAsync(1, new Rect(0, 0, dim[0], dim[1]),
-                    mTab.getContentViewCore(), Bitmap.Config.ARGB_8888, bitmapCallback);
-        }
-    };
-
-    private final TabObserver mTabObserver = new EmptyTabObserver() {
-        @Override
-        public void onContentChanged(Tab tab) {
-            ThumbnailTabHelper.this.onContentChanged();
-        }
-
-        @Override
-        public void onCrash(Tab tab, boolean sadTabShown) {
-            cancelThumbnailCapture();
-        }
-
-        @Override
-        public void onPageLoadStarted(Tab tab, String url) {
-            cancelThumbnailCapture();
-            mThumbnailCapturedForLoad = false;
-        }
-
-        @Override
-        public void onPageLoadFinished(Tab tab) {
-            rescheduleThumbnailCapture();
-        }
-
-        @Override
-        public void onPageLoadFailed(Tab tab, int errorCode) {
-            cancelThumbnailCapture();
-        }
-
-        @Override
-        public void onShown(Tab tab) {
-            // For tabs opened in the background, they may finish loading prior to becoming visible
-            // and the thumbnail capture triggered as part of load finish will be skipped as the
-            // tab has nothing rendered.  To handle this case, we also attempt thumbnail capture
-            // when showing the tab to give it a better chance to have valid content.
-            rescheduleThumbnailCapture();
-        }
-
-        @Override
-        public void onClosingStateChanged(Tab tab, boolean closing) {
-            if (closing) cancelThumbnailCapture();
-        }
-
-        @Override
-        public void onDestroyed(Tab tab) {
-            mTab.removeObserver(mTabObserver);
-            if (mContentViewCore != null) {
-                mContentViewCore.removeGestureStateListener(mGestureListener);
-                mContentViewCore = null;
-            }
-        }
-
-        @Override
-        public void onDidStartProvisionalLoadForFrame(
-                Tab tab, long frameId, long parentFrameId, boolean isMainFrame, String validatedUrl,
-                boolean isErrorPage, boolean isIframeSrcdoc) {
-            if (isMainFrame) {
-                mWasRenderViewHostReady = mIsRenderViewHostReady;
-                mIsRenderViewHostReady = false;
-            }
-        }
-
-        @Override
-        public void onDidFailLoad(
-                Tab tab, boolean isProvisionalLoad, boolean isMainFrame, int errorCode,
-                String description, String failingUrl) {
-            // For a case that URL overriding happens, we should recover |mIsRenderViewHostReady| to
-            // its old value to enable capturing thumbnail of the current page.
-            // If this failure shows an error page, capturing thumbnail will be denied anyway in
-            // canUpdateHistoryThumbnail().
-            if (isProvisionalLoad && isMainFrame) mIsRenderViewHostReady = mWasRenderViewHostReady;
-        }
-
-        @Override
-        public void onDidCommitProvisionalLoadForFrame(
-                Tab tab, long frameId, boolean isMainFrame, String url, int transitionType) {
-            if (isMainFrame) mIsRenderViewHostReady = true;
-        }
-    };
-
-    private GestureStateListener mGestureListener = new GestureStateListener() {
-        @Override
-        public void onFlingStartGesture(int vx, int vy, int scrollOffsetY, int scrollExtentY) {
-            cancelThumbnailCapture();
-        }
-
-        @Override
-        public void onFlingEndGesture(int scrollOffsetY, int scrollExtentY) {
-            rescheduleThumbnailCapture();
-        }
-
-        @Override
-        public void onScrollStarted(int scrollOffsetY, int scrollExtentY) {
-            cancelThumbnailCapture();
-        }
-
-        @Override
-        public void onScrollEnded(int scrollOffsetY, int scrollExtentY) {
-            rescheduleThumbnailCapture();
-        }
-    };
-
-    /**
-     * Creates a thumbnail tab helper for the given tab.
-     * @param tab The Tab whose thumbnails will be generated by this helper.
-     */
-    public static void createForTab(Tab tab) {
-        new ThumbnailTabHelper(tab);
-    }
-
-    /**
-     * Constructs the thumbnail tab helper for a given Tab.
-     * @param tab The Tab whose thumbnails will be generated by this helper.
-     */
-    private ThumbnailTabHelper(Tab tab) {
-        mTab = tab;
-        mTab.addObserver(mTabObserver);
-
-        mHandler = new Handler();
-
-        Resources res = tab.getWindowAndroid().getApplicationContext().getResources();
-        mThumbnailWidth = res.getDimensionPixelSize(R.dimen.most_visited_thumbnail_width);
-        mThumbnailHeight = res.getDimensionPixelSize(R.dimen.most_visited_thumbnail_height);
-
-        onContentChanged();
-    }
-
-    private void onContentChanged() {
-        if (mContentViewCore != null) {
-            mContentViewCore.removeGestureStateListener(mGestureListener);
-        }
-
-        mContentViewCore = mTab.getContentViewCore();
-        if (mContentViewCore != null) {
-            mContentViewCore.addGestureStateListener(mGestureListener);
-            nativeInitThumbnailHelper(mContentViewCore.getWebContents());
-        }
-    }
-
-    private ChromeActivity getActivity() {
-        WindowAndroid window = mTab.getWindowAndroid();
-        return (ChromeActivity) window.getActivity().get();
-    }
-
-    private void cancelThumbnailCapture() {
-        mHandler.removeCallbacks(mThumbnailRunnable);
-    }
-
-    private void rescheduleThumbnailCapture() {
-        if (mThumbnailCapturedForLoad) return;
-        cancelThumbnailCapture();
-        // Capture will be rescheduled when the GestureStateListener receives a
-        // scroll or fling end notification.
-        if (mTab.getContentViewCore() != null
-                && mTab.getContentViewCore().isScrollInProgress()) {
-            return;
-        }
-        mHandler.postDelayed(mThumbnailRunnable, THUMBNAIL_CAPTURE_DELAY_MS);
-    }
-
-    private boolean shouldUpdateThumbnail() {
-        return nativeShouldUpdateThumbnail(mTab.getProfile(), mTab.getUrl());
-    }
-
-    private void updateThumbnail(Bitmap bitmap) {
-        if (mTab.getContentViewCore() != null) {
-            final boolean atTop = mTab.getContentViewCore().computeVerticalScrollOffset() == 0;
-            nativeUpdateThumbnail(mTab.getWebContents(), bitmap, atTop);
-        }
-    }
-
-    private boolean canUpdateHistoryThumbnail() {
-        String url = mTab.getUrl();
-        if (url.startsWith(UrlConstants.CHROME_SCHEME)
-                || url.startsWith(UrlConstants.CHROME_NATIVE_SCHEME)) {
-            return false;
-        }
-        return mTab.isReady()
-                && !mTab.isShowingErrorPage()
-                && !mTab.isHidden()
-                && !mTab.isShowingSadTab()
-                && !mTab.isShowingInterstitialPage()
-                && mTab.getProgress() == 100
-                && mTab.getWidth() > 0
-                && mTab.getHeight() > 0;
-    }
-
-    private void updateHistoryThumbnail(Bitmap bitmap) {
-        if (mTab.isIncognito()) return;
-
-        // TODO(yusufo): It will probably be faster and more efficient on resources to do this on
-        // the native side, but the thumbnail_generator code has to be refactored a bit to allow
-        // creating a downsized version of a bitmap progressively.
-        if (bitmap.getWidth() != mThumbnailWidth
-                || bitmap.getHeight() != mThumbnailHeight
-                || bitmap.getConfig() != Config.ARGB_8888) {
-            try {
-                int[] dim = new int[] {
-                        bitmap.getWidth(), bitmap.getHeight()
-                };
-                // If the thumbnail size is small compared to the bitmap size downsize in
-                // two stages. This makes the final quality better.
-                float scale = Math.max(
-                        (float) mThumbnailWidth / dim[0],
-                        (float) mThumbnailHeight / dim[1]);
-                int adjustedWidth = (scale < 1)
-                        ? mThumbnailWidth * (int) (1 / Math.sqrt(scale)) : mThumbnailWidth;
-                int adjustedHeight = (scale < 1)
-                        ? mThumbnailHeight * (int) (1 / Math.sqrt(scale)) : mThumbnailHeight;
-                scale = MathUtils.scaleToFitTargetSize(dim, adjustedWidth, adjustedHeight);
-                // Horizontally center the source bitmap in the final result.
-                float leftOffset = (adjustedWidth - dim[0]) / 2.0f / scale;
-                Bitmap tmpBitmap = Bitmap.createBitmap(adjustedWidth,
-                        adjustedHeight, Config.ARGB_8888);
-                Canvas c = new Canvas(tmpBitmap);
-                c.scale(scale, scale);
-                c.drawBitmap(bitmap, leftOffset, 0, new Paint(Paint.FILTER_BITMAP_FLAG));
-                if (scale < 1) {
-                    tmpBitmap = Bitmap.createScaledBitmap(tmpBitmap,
-                            mThumbnailWidth, mThumbnailHeight, true);
-                }
-                updateThumbnail(tmpBitmap);
-                tmpBitmap.recycle();
-            } catch (OutOfMemoryError ex) {
-                Log.w(TAG, "OutOfMemoryError while updating the history thumbnail.");
-            }
-        } else {
-            updateThumbnail(bitmap);
-        }
-    }
-
-    private static native void nativeInitThumbnailHelper(WebContents webContents);
-    private static native void nativeUpdateThumbnail(
-            WebContents webContents, Bitmap bitmap, boolean atTop);
-    private static native boolean nativeShouldUpdateThumbnail(Profile profile, String url);
-}