Fix BaseFilter bug

cameraview/src/main/java/com/otaliastudios/cameraview/filter/BaseFilter.java

@@ -133,9 +133,10 @@ public abstract class BaseFilter implements Filter {
 
     @Override
     public void onDestroy() {
-        // NOTE: this destroys the GL program, but Filter consumers (GlTextureDrawer, MultiFilter)
-        // will destroy it too (just like they create it). Hope this doesn't cause any issue;
-        // if it does, we could avoid calling release here.
+        // Since we used the handle constructor of GlTextureProgram, calling release here
+        // will NOT destroy the GL program. This is important because Filters are not supposed
+        // to have ownership of programs. Creation and deletion happen outside, and deleting twice
+        // would cause an error.
         program.release();
         program = null;
     }

demo/src/main/java/com/otaliastudios/cameraview/demo/CameraActivity.java

@@ -47,8 +47,8 @@ import java.util.List;
 public class CameraActivity extends AppCompatActivity implements View.OnClickListener, OptionView.Callback {
 
     private final static CameraLogger LOG = CameraLogger.create("DemoApp");
-    private final static boolean USE_FRAME_PROCESSOR = true;
-    private final static boolean DECODE_BITMAP = true;
+    private final static boolean USE_FRAME_PROCESSOR = false;
+    private final static boolean DECODE_BITMAP = false;
 
     private CameraView camera;
     private ViewGroup controlPanel;
@@ -76,7 +76,7 @@ public class CameraActivity extends AppCompatActivity implements View.OnClickLis
                     long newTime = frame.getTime();
                     long delay = newTime - lastTime;
                     lastTime = newTime;
-                    LOG.e("Frame delayMillis:", delay, "FPS:", 1000 / delay);
+                    LOG.v("Frame delayMillis:", delay, "FPS:", 1000 / delay);
                     if (DECODE_BITMAP) {
                         if (frame.getFormat() == ImageFormat.NV21
                                 && frame.getDataClass() == byte[].class) {