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Commit ff77667c authored by Roman Birg's avatar Roman Birg
Browse files

SystemUI: workaround for visualizer flash on track change 



Change-Id: I852c704816f1e56f239a38f00910132ad8363fcd
Signed-off-by: default avatarRoman Birg <roman@cyngn.com>
parent d2f90f5c

packages/SystemUI/src/com/android/systemui/statusbar/BackDropView.java

+49 −14
Original line number Diff line number Diff line
@@ -30,8 +30,6 @@ import android.graphics.Canvas; 
import android.graphics.DashPathEffect;

import android.graphics.Paint;

import android.graphics.Rect;

import android.graphics.drawable.BitmapDrawable;

import android.media.session.PlaybackState;

import android.os.AsyncTask;

import android.os.Handler;

import android.os.PowerManager;
@@ -378,12 +376,15 @@ public class BackDropView extends FrameLayout implements Palette.PaletteAsyncLis 
                }

            };



    private static class LockscreenBarEqRenderer extends Renderer {

    private class LockscreenBarEqRenderer extends Renderer {

        private int mDivisions;

        private Paint mPaint;

        private int mDbFuzz;

        private int mDbFuzzFactor;



        private boolean mDrawEmpty;

        int mFramesSinceLastEmptyRender;



        /**

         * Renders the FFT data as a series of lines, in histogram form

         *
@@ -411,6 +412,11 @@ public class BackDropView extends FrameLayout implements Palette.PaletteAsyncLis 


        @Override

        public void onRender(Canvas canvas, FFTData data, Rect rect) {

            if (isDataEmpty(data)) {

                mDrawEmpty = true;

                mFramesSinceLastEmptyRender = 0;

            } else {

                mFramesSinceLastEmptyRender++;

                for (int i = 0; i < data.bytes.length / mDivisions; i++) {

                    mFFTPoints[i * 4] = i * 4 * mDivisions;

                    mFFTPoints[i * 4 + 2] = i * 4 * mDivisions;
@@ -422,11 +428,40 @@ public class BackDropView extends FrameLayout implements Palette.PaletteAsyncLis 
                    mFFTPoints[i * 4 + 1] = rect.height();

                    mFFTPoints[i * 4 + 3] = rect.height() - ((dbValue * mDbFuzzFactor) + mDbFuzz);

                }

            }



             /*

              * When transitioning songs, we get a bunch of empty frames, followed by 1 frame

              * as the track switch occurs, then some more empty frames until the song starts.

              *

              * We skip the first frame in between empty frames here to avoid drawing

              * anything when we're switching songs

              */

            mDrawEmpty = mFramesSinceLastEmptyRender == 1;



            if (mFramesSinceLastEmptyRender == 1) {

                //

                mDrawEmpty = true;

            }

            if (mDrawEmpty) {

                mVisualizer.setDrawingEnabled(false);

            } else {

                mVisualizer.setDrawingEnabled(true);

                canvas.drawLines(mFFTPoints, mPaint);

            }

        }



        private boolean isDataEmpty(FFTData data) {

            for (int i = 0; i < data.bytes.length; i++) {

                if (data.bytes[i] != 0) {

                    return false;

                }

            }

            return true;

        }



    }



    private class SettingsObserver extends UserContentObserver {

        SettingsObserver(Handler handler) {

            super(handler);