private boolean showSurface(float alpha) {
if (!mSurfaceVisible || mSurfaceAlpha != alpha) {
SurfaceControl.openTransaction();
try {
mSurfaceControl.setLayer(ELECTRON_BEAM_LAYER);
mSurfaceControl.setAlpha(alpha);
mSurfaceControl.show();
} finally {
SurfaceControl.closeTransaction();
}
mSurfaceVisible = true;
mSurfaceAlpha = alpha;
}
return true;
}
private void destroySurface() {
if (mSurfaceControl != null) {
mSurfaceLayout.dispose();
mSurfaceLayout = null;
SurfaceControl.openTransaction();
try {
mSurfaceControl.destroy();
mSurface.release();
} finally {
SurfaceControl.closeTransaction();
}
mSurfaceControl = null;
mSurfaceVisible = false;
mSurfaceAlpha = 0f;
}
}
private boolean createSurface() {
if (mSurfaceSession == null) {
mSurfaceSession = new SurfaceSession();
}
SurfaceControl.openTransaction();
try {
if (mSurfaceControl == null) {
try {
int flags;
if (mMode == MODE_FADE) {
flags = SurfaceControl.FX_SURFACE_DIM | SurfaceControl.HIDDEN;
} else {
flags = SurfaceControl.OPAQUE | SurfaceControl.HIDDEN;
}
mSurfaceControl =
new SurfaceControl(
mSurfaceSession,
"ElectronBeam",
mDisplayWidth,
mDisplayHeight,
PixelFormat.OPAQUE,
flags);
} catch (OutOfResourcesException ex) {
Slog.e(TAG, "Unable to create surface.", ex);
return false;
}
}
mSurfaceControl.setLayerStack(mDisplayLayerStack);
mSurfaceControl.setSize(mDisplayWidth, mDisplayHeight);
mSurface = new Surface();
mSurface.copyFrom(mSurfaceControl);
mSurfaceLayout = new NaturalSurfaceLayout(mDisplayManager, mSurfaceControl, mHWRotation);
mSurfaceLayout.onDisplayTransaction();
} finally {
SurfaceControl.closeTransaction();
}
return true;
}