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。
Video card or driver doesn't support separate alpha blend, glow will be disabled.
显卡或驱动不支持分离的透明度混合渲染，显示功能将被禁用。
Fixed issue with distorted video when converting it in alpha matte.
固定的问题时，扭曲的视频转换阿尔法无光了。
Fixed issue with distorted video when converting it in alpha matte.
固定的问题时，扭曲的视频转换阿尔法无光了。
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