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_How to use MiniGUI's synchronous update mechanism to reduce screen flicker._
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_How to use MiniGUI's synchronous update mechanism to reduce screen flicker._
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## Introduction
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Table of Contents
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## Key Points
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- [Overview](#overview)
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- [Usage](#usage)
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- [Restrictions](#restrictions)
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## Overview
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TBC... |
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## Usage
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- Including option `--enable-syncupdate` when configuring MiniGUI.
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- Using a shadow NEWGAL engine and implementing `UpdateRects` method
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of your NEWGAL engine to update the dirty regions to your real
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screen frame buffer.
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- Calling `SyncUpdateDC(HDC_SCREEN)` when you want to update the
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screen. Generally, you can call this function after calling `EndPaint`
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function when handling `MSG_PAINT` message.
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## Restrictions
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The synchronous update mechanism provides an easy way to reduce
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the screen flicker. However, it has the following restrictions:
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- It only works with low resolution.
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- It may hide a lot of inefficient code in your MiniGUI app.
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- It lacks support for hardware acceleration.
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Therefore, for modern graphics stack (system shipped with a GPU),
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the better way is using off-screen surface and exploiting the
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hardware acceleration as far as possible. |
