trigger certain actions in one app based on events in another app.
You may have encountered keyboards with an optional lift at the back of the board, raising the top keys higher than the space bar. Every set of hands is different, but for most people, pulling the backs of the hands towards the forearms increases strain. Negative tilt has the opposite effect by sloping in the other direction, lowering the top number keys while raising the edge with the spacebar. Many Alice and some split keyboards offer an optional negative tilt. I found it was more comfortable to enable that feature when I’m standing, and I preferred to have the keys flat when sat at my desk.。关于这个话题，safew官方版本下载提供了深入分析
pixel[2] = pixel[2] 0.04045f ? powf((pixel[2] + 0.055f) / 1.055f, 2.4f) : pixel[2] / 12.92f;，这一点在夫子中也有详细论述
在你的代码开头，我们看到了这样的设定：
unsigned short unused;