After debug into SurfaceFringer, I found the following code can work
to set overlay position:
sp<SurfaceComposerClient> client = new SurfaceComposerClient();
// create pushbuffer surface
sp<Surface> surface = client->createSurface(getpid(), 0, 320,
240,
PIXEL_FORMAT_UNKNOWN, ISurfaceComposer::ePushBuffers);
// get to the isurface
sp<ISurface> isurface = Test::getISurface(surface);
printf("isurface = %p\n", isurface.get());
// now request an overlay
sp<OverlayRef> ref = isurface->createOverlay(320, 240,
PIXEL_FORMAT_RGB_565);
sp<Overlay> overlay = new Overlay(ref);
/* Code to set position */
client->openTransaction();
surface->setPosition(30, 30);
client->closeTransaction();
/*
* here we can use the overlay API
*/
overlay_buffer_t buffer;
overlay->dequeueBuffer(&buffer);
printf("buffer = %p\n", buffer);
void* address = overlay->getBufferAddress(buffer);
printf("address = %p\n", address);
overlay->queueBuffer(buffer);
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