Anti-aliased text and alpha blended pixmaps.
抗锯齿文本和混合视频的象素映射。
One simple and effective way of indicating nonfocus is to place a red box around an alpha-blended snapshot of the screen.
指示非焦点的一种简单而有效的方法是在阿尔法混合的屏幕快照周围放置一个红框。
For example, when drawing a circle, create decreasing radius and alpha-blended circles around the main point for a nice fade-out effect.
例如，绘制圆形时，在中心点周围创建半径逐渐减少的阿尔法混合圆形可以获得优美的渐变效果。
No matter the options selected or the parameters specified, drawing an alpha-blended circle does not appear to be possible.
无论选定哪些选项或指定哪些参数，绘制阿尔法混合的圆形都显得不太可能。
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。
Solid and alpha-blended (semi-transparent) colors.
纯色和半透明混合颜色。
Solid and alpha-blended (semi-transparent) colors.
纯色和半透明混合颜色。
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