For our first simple effect, we will draw an alpha-blended (semitransparent) circle at a fixed position over the video stream. The first step is to add the drawing functions to the screen.c.

对于第一个简单效果，将在视频流中的固定位置绘制一个阿尔法混合(半透明的)圆。

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The Mac release was only alpha quality, but it was still a major step forward in making OpenOffice a real competitor to Microsoft Office.

虽然 Mac 版本只具有内部测试版品质（alpha quality），但仍然极大推动了 OpenOffice，使其离成为 Microsoft Office 有力竞争者这一目标更进一步。

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