Strange lightening on page curl

2018-07-01 05:55:54

I'm using page curl animation created by Harism at https://github.com/harism/android_page_curl‎ .I have implemented his animation to my e-book reader app for android and the problem is when I swipe pages fastly, sometimes strange white lightening is switched. However when I curl pages normally there is not such situation. I think the problem is on OpenGL side.I'm not familiar with that technology but in debugging process I see that after page curl finished there is still some drawing process is going on CurlRenderer class at onDrawFrame method.

    @Override
    public synchronized void onDrawFrame(final GL10 gl) {
        mObserver.onDrawFrame();
        gl.glClearColor(Color.red(mBackgroundColor) / 255f,
                Color.green(mBackgroundColor) / 255f,
                Color.blue(mBackgroundColor) / 255f,
                Color.alpha(mBackgroundColor) / 255f);
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
        gl.glLoadIdentity();
        if (USE_PERSPECTIVE_PROJECTION) {
            gl.glTranslatef(0, 0, -6f);
        }
        for (int i = 0; i < mCurlMeshes.size(); ++i) {

            mCurlMeshes.get(i).onDrawFrame(gl);
        }
        Calendar now = Calendar.getInstance();
        int minute = now.get(Calendar.MINUTE);
        int second = now.get(Calendar.SECOND);
        int millis = now.get(Calendar.MILLISECOND);
        Log.i("time curl renderer (onDrawFrame) : ", minute + ":" + second + "." + millis);
    }

Below is the log

02-20 07:27:37.320  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.326
02-20 07:27:37.328  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.336
02-20 07:27:37.335  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.344
02-20 07:27:37.343  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.354
02-20 07:27:37.359  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.367
02-20 07:27:37.367  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.377
02-20 07:27:37.375  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.387
02-20 07:27:37.390  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.399
02-20 07:27:37.398  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.410
02-20 07:27:37.414  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.422
02-20 07:27:37.421  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.432
02-20 07:27:37.437  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.444
02-20 07:27:37.445  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.455
02-20 07:27:37.453  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.465
02-20 07:27:37.468  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.477
02-20 07:27:37.476  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.487
02-20 07:27:37.492  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.501
02-20 07:27:37.500  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.509
02-20 07:27:37.515  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.520
02-20 07:27:37.523  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.532
02-20 07:27:37.531  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.542
02-20 07:27:37.546  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.555
02-20 07:27:37.554  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.565
02-20 07:27:37.570  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.576
02-20 07:27:37.578  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.588
02-20 07:27:37.585  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.598
02-20 07:27:37.601  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.610
02-20 07:27:37.609  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.619
02-20 07:27:37.617  30215-30407/org.com.ebook I/time curl renderer (onDrawFrame) :﹕ 27:37.629

book's page finishes curling when first line of log appears let's say 02-20 07:27:37.320 at this situation, but on the next lines you can see that onDrawFrame method is called continuosly.Maybe I'm curling pages when this method do not finished it's work yet and lightening switch coming from that fault? Any help?Here is the link of video you can see there that lightening appears sometimes http://www.youtube.com/watch?v=HPJ2U18Caok&feature=youtu.be