Merge "Revert SurfaceView back to Q's version" into qt-r1-dev am: 2f8cae24

import android.graphics.BlendMode;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.HardwareRenderer;

import android.graphics.Paint;

import android.graphics.PixelFormat;

import android.graphics.PorterDuff;

    private SurfaceControl.Transaction mRtTransaction = new SurfaceControl.Transaction();

    /**

     * A callback which reflects an alpha value of this view onto the underlying surfaces.

     *

     * <p class="note"><strong>Note:</strong> This doesn't have to be defined as a member variable,

     * but can be defined as an inline lambda when calling ViewRootImpl#registerRtFrameCallback().

     * However when we do so, the callback is triggered only for a few times and stops working for

     * some reason. It's suspected that there is a problem around garbage collection, and until

     * the cause is fixed, we will keep this callback in a member variable.</p>

    */

    private HardwareRenderer.FrameDrawingCallback mSetSurfaceAlphaCallback = frame -> {

        final ViewRootImpl viewRoot = getViewRootImpl();

        if (viewRoot == null || viewRoot.mSurface == null || !viewRoot.mSurface.isValid()) {

            // In this case, the alpha value is reflected on the screen in #updateSurface() later.

            return;

        }

        final SurfaceControl.Transaction t = new SurfaceControl.Transaction();

        t.setAlpha(mSurfaceControl, getAlpha());

        t.deferTransactionUntilSurface(mSurfaceControl, viewRoot.mSurface, frame);

        t.setEarlyWakeup();

        t.apply();

    };

    public SurfaceView(Context context) {

        this(context, null);

    }

        updateSurface();

    }

    @Override

    public void setAlpha(float alpha) {

        super.setAlpha(alpha);

        final ViewRootImpl viewRoot = getViewRootImpl();

        if (viewRoot == null) {

            return;

        }

        viewRoot.registerRtFrameCallback(mSetSurfaceAlphaCallback);

        invalidate();

    }

    private void performDrawFinished() {

        if (mPendingReportDraws > 0) {

            mDrawFinished = true;

                        }

                        updateBackgroundVisibilityInTransaction(viewRoot.getSurfaceControl());

                        // Alpha value change is handled in setAlpha() directly using a local

                        // transaction. However it can happen that setAlpha() is called while

                        // local transactions cannot be applied, so the value is stored in a View

                        // but not yet reflected on the Surface.

                        mSurfaceControl.setAlpha(getAlpha());

                        mBackgroundControl.setAlpha(getAlpha());

                        // While creating the surface, we will set it's initial

                        // geometry. Outside of that though, we should generally

                        // leave it to the RenderThread.