view draw 流程分析

之前的relayout 说道返回了mSurface ，
int relayoutResult = mWindowSession.relayout(//调用session 中的 relayout，又binder 调用wms relayoutWindow
                mWindow, mSeq, params,
                (int) (mView.getMeasuredWidth() * appScale + 0.5f),
                (int) (mView.getMeasuredHeight() * appScale + 0.5f),
                viewVisibility, insetsPending ? WindowManagerGlobal.RELAYOUT_INSETS_PENDING : 0,
                mWinFrame, mPendingOverscanInsets, mPendingContentInsets, mPendingVisibleInsets,
                mPendingStableInsets, mPendingOutsets, mPendingBackDropFrame, mPendingConfiguration,
                mSurface
AP侧Surface 负责UI绘制，WMS侧也有Surface，负责窗口的属性控制，要全局考虑 统筹安排。
 private void performDraw() {
  try {
            draw(fullRedrawNeeded);
        } finally {
            mIsDrawing = false;
            Trace.traceEnd(Trace.TRACE_TAG_VIEW);
        }
        。。。
        

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