// We don't recreate the surface controls but only recreate the adapter. Since the blast layer
// is still alive, the old buffers will continue to be presented until replaced by buffers from
// the new adapter. This means we do not need to track the old surface control and destroy it
// after the client has drawn to avoid any flickers.
private void createBlastSurfaceControls(ViewRootImpl viewRoot, String name,
Transaction geometryTransaction) {
if (mSurfaceControl == null) {
mSurfaceControl = new SurfaceControl.Builder(mSurfaceSession)
.setName(name)
.setLocalOwnerView(this)
.setParent(viewRoot.getBoundsLayer())
.setCallsite("SurfaceView.updateSurface")
.setContainerLayer()
.build();
}
if (mBlastSurfaceControl == null) {
mBlastSurfaceControl = new SurfaceControl.Builder(mSurfaceSession)
.setName(name + "(BLAST)")
.setLocalOwnerView(this)
.setParent(mSurfaceControl)
.setFlags(mSurfaceFlags)
.setHidden(false)
.setBLASTLayer()
.setCallsite("SurfaceView.updateSurface")
.build();
} else {
// update blast layer
mTmpTransaction
.setOpaque(mBlastSurfaceControl, (mSurfaceFlags & SurfaceControl.OPAQUE) != 0)
.setSecure(mBlastSurfaceControl, (mSurfaceFlags & SurfaceControl.SECURE) != 0)
.show(mBlastSurfaceControl)
.apply();
}
if (mBackgroundControl == null) {
mBackgroundControl = createBackgroundControl(name);
}
// Always recreate the IGBP for compatibility. This can be optimized in the future but
// the behavior change will need to be gated by SDK version.
if (mBlastBufferQueue != null) {
mBlastBufferQueue.destroy();
}
mTransformHint = viewRoot.getBufferTransformHint();
mBlastSurfaceControl.setTransformHint(mTransformHint);
mBlastBufferQueue = new BLASTBufferQueue(name);
mBlastBufferQueue.update(mBlastSurfaceControl, mSurfaceWidth, mSurfaceHeight, mFormat,
geometryTransaction);
}
- 相比非 blast,会多创建一个 container layer。