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Using SyncUpdateDC to Reduce Screen Flicker

How to use MiniGUI's synchronous update mechanism to reduce screen flicker.

Table of Contents

Overview

Usage

  • Including option --enable-syncupdate when configuring MiniGUI.
  • Using a shadow NEWGAL engine and implementing UpdateRects method of your NEWGAL engine to update the dirty regions to your real screen frame buffer.
  • Calling SyncUpdateDC(HDC_SCREEN) when you want to update the screen. Generally, you can call this function after calling EndPaint function when handling MSG_PAINT message.

Restrictions

The synchronous update mechanism provides an easy way to reduce the screen flicker. However, it has the following restrictions:

  • It only works with low resolution.
  • It may hide the side effects of some inefficient code in your MiniGUI app.
  • It lacks support for hardware acceleration.

Therefore, for modern graphics stack (system shipped with a GPU), the better way is using off-screen surface and exploiting the hardware acceleration as far as possible.