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Commit 41f4544e authored by Mark Renouf's avatar Mark Renouf
Browse files

Scroll Capture: Add configurable post-scroll capture delay 

Default 60ms after next animation pulse, configurable with:

adb shell settings put global screenshot.scroll_capture_delay ##

Bug: 173700533
Test: manual - long screenshot Play Store/Google Photos
      observe that images are fully visible when captured
Change-Id: I84e0b1fd6b94d3ff7177fa00166da40b30f311cf
parent d07729d7

core/java/com/android/internal/view/ScrollCaptureViewSupport.java

+22 −9
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
package com.android.internal.view;



import android.annotation.UiThread;

import android.content.ContentResolver;

import android.content.Context;

import android.content.pm.ActivityInfo;

import android.graphics.HardwareRenderer;
@@ -26,6 +27,7 @@ import android.graphics.Rect; 
import android.graphics.RectF;

import android.graphics.RenderNode;

import android.os.CancellationSignal;

import android.provider.Settings;

import android.util.DisplayMetrics;

import android.util.Log;

import android.view.Display.ColorMode;
@@ -53,11 +55,14 @@ public class ScrollCaptureViewSupport<V extends View> implements ScrollCaptureCa 


    private static final String TAG = "ScrollCaptureViewSupport";



    private static final boolean WAIT_FOR_ANIMATION = true;

    private static final String SETTING_CAPTURE_DELAY = "screenshot.scroll_capture_delay";

    private static final long SETTING_CAPTURE_DELAY_DEFAULT = 60L; // millis



    private final WeakReference<V> mWeakView;

    private final ScrollCaptureViewHelper<V> mViewHelper;

    private final ViewRenderer mRenderer;

    private final long mPostScrollDelayMillis;



    private boolean mStarted;

    private boolean mEnded;
@@ -66,6 +71,10 @@ public class ScrollCaptureViewSupport<V extends View> implements ScrollCaptureCa 
        mRenderer = new ViewRenderer();

        // TODO(b/177649144): provide access to color space from android.media.Image

        mViewHelper = viewHelper;

        Context context = containingView.getContext();

        ContentResolver contentResolver = context.getContentResolver();

        mPostScrollDelayMillis = Settings.Global.getLong(contentResolver,

                SETTING_CAPTURE_DELAY, SETTING_CAPTURE_DELAY_DEFAULT);

    }



    /** Based on ViewRootImpl#updateColorModeIfNeeded */
@@ -120,37 +129,41 @@ public class ScrollCaptureViewSupport<V extends View> implements ScrollCaptureCa 
    public final void onScrollCaptureImageRequest(ScrollCaptureSession session,

            CancellationSignal signal, Rect requestRect, Consumer<Rect> onComplete) {

        if (signal.isCanceled()) {

            Log.w(TAG, "onScrollCaptureImageRequest: cancelled!");

            return;

        }



        V view = mWeakView.get();

        if (view == null || !view.isVisibleToUser()) {

            // Signal to the controller that we have a problem and can't continue.

            onComplete.accept(new Rect());

            return;

        }



        // Ask the view to scroll as needed to bring this area into view.

        ScrollResult scrollResult = mViewHelper.onScrollRequested(view, session.getScrollBounds(),

                requestRect);



        if (scrollResult.availableArea.isEmpty()) {

            onComplete.accept(scrollResult.availableArea);

            return;

        }

        view.invalidate(); // don't wait for vsync



        // For image capture, shift back by scrollDelta to arrive at the location within the view

        // where the requested content will be drawn

        Rect viewCaptureArea = new Rect(scrollResult.availableArea);

        viewCaptureArea.offset(0, -scrollResult.scrollDelta);



        if (WAIT_FOR_ANIMATION) {

            view.postOnAnimation(() ->  {

                mRenderer.renderView(view, viewCaptureArea);

                onComplete.accept(new Rect(scrollResult.availableArea));

            });

        Runnable captureAction = () -> {

            if (signal.isCanceled()) {

                Log.w(TAG, "onScrollCaptureImageRequest: cancelled! skipping render.");

            } else {

                mRenderer.renderView(view, viewCaptureArea);

                onComplete.accept(new Rect(scrollResult.availableArea));

            }

        };



        view.postOnAnimationDelayed(captureAction, mPostScrollDelayMillis);

    }



    @Override