问题
A while ago I askedthis question which received an answer.
I have implemented an intermediary Surface as the answer suggested, but now I've run into another problem. At some points in time during my application, my VirtualDisplay can change resolution. So, I'd like to also update the size of my intermediary Surface to match the change in resolution of the VirtualDisplay. I was hoping this would be a simple call to setDefaultBufferSize on the Surface's underlying SurfaceTexture, but that doesn't appear to work.
I've poked around at releasing my intermediary Surface and SurfaceTexture and making new ones, but then I have to set the output surface for the VirtualDisplay to be null and do some other synchronization steps which I'd like to avoid if possible.
Is there a way to dynamically update the size of a Surface/SurfaceTexture after creation?
UPDATE:
I've tried calling VirtualDisplay.setSurface(null) along with VirtualDisplay.resize(newSize.width, newSize.height) and then sending a message to the thread which handles the callbacks for the intermediary SurfaceTextureto resize the texture via setDefaultBufferSize and then having the main thread poll the secondary thread until that set call is finished and then call VirtualDisplay.setSurface(surfaceFromSecondaryThread)
This works sometimes. Other times the texture is all green with a gray bar across it (which is also my glClearColor, not sure if that is related as seen here). Sometimes the current screen image is seen duplicates/smaller in my VirtualDisplay. So, it seems like a timing issue, but what timing I should wait for, I am unsure. The documentation for setDefaultBufferSize states:
For OpenGL ES, the EGLSurface should be destroyed (via eglDestroySurface), made not-current (via eglMakeCurrent), and then recreated (via eglCreateWindowSurface) to ensure that the new default size has taken effect.
The problem is that my code does not create an EGLSurface from the SurfaceTexture/Surface so, I have no way of destroying it. I'm assuming that the producer (VirtualDisplay) does, but there are no public APIs for me to get at the EGLSurface.
[UPDATE 2]
So, when I see the problem (green screen with bar, corruption, perhaps because my glClearColor is green) if I do a glReadPixels before I call eglSwapBuffers to write to the Surface for the MediaCodec, I read green pixels. This tells me that it isn't a MediaCodec problem, that either the information written to the Surface from the VirtualDisplay is corrupt (and remains corrupt) or the conversion from YUV space to RGBA space when going from Surface -> OpenGL texture is broken somehow. I'm leaning towards there being a problem with VirtualDisplay
来源：https://stackoverflow.com/questions/35209004/resize-surface-when-resizing-virtualdisplay