x11perf

x11perf 是一个 X11 Server 的性能测试程序

Xlib

Xlib 是 X11 核心客户端库，客户端程序基本上都是调用它提供的 API 来绘制图形的。 而 Xlib 的函数基本上都是给 xserver 发请求

File	Request
src/ImText16.c:86:9:	GetReq (ImageText16, req);
src/Text16.c:50:5:	GetReq (PolyText16, req);
src/DrSegs.c:47:2:	GetReq (PolySegment, req);
src/LiHosts.c:85:5:	GetReq (ListHosts, req);
src/PolyTxt.c:49:5:	GetReq (PolyText8, req);
src/SetPntMap.c:43:5:	GetReq (SetPointerMapping, req);
src/SetPntMap.c:66:5:	GetReq (ChangeKeyboardMapping, req);
src/GetProp.c:60:5:	GetReq (GetProperty, req);
src/DrLines.c:45:5:	GetReq (PolyLine, req);
src/xcms/cmsLkCol.c:151:5:	GetReq (LookupColor, req);
src/RotProp.c:44:5:	GetReq (RotateProperties, req);
src/ImText.c:85:9:	GetReq (ImageText8, req);
src/OpenDis.c:532:6:	GetReq (GetProperty, req);
src/SetFPath.c:48:2:	GetReq (SetFontPath, req);
src/ParseCol.c:120:6:	GetReq (LookupColor, req);
src/ChProp.c:47:5:	GetReq (ChangeProperty, req);
src/Text.c:50:5:	GetReq (PolyText8, req);
src/PolyTxt16.c:49:5:	GetReq (PolyText16, req);
src/LookupCol.c:83:2:	GetReq (LookupColor, req);
src/GetImage.c:64:2:	GetReq (GetImage, req);
src/SetCRects.c:46:5:	GetReq (SetClipRectangles, req);

P.S.: formatting command

rg 'GetReq (.*, req)' --vimgrep -tc | awk -F"[ \t]+" '{printf "| %30-s | ", $1; $1=""; printf "%40-s |\n", $0}'

Xserver

Xserver 的工作方式是一个典型的 CS 架构，服务端接收到这些请求时，在一个 while 循环里分发和处理这些请求，或者睡眠(Block 自己)。Xserver 这个分发处理逻辑实现在 dix/dispatch.c:Dispatch() 函数里。Xserver 甚至搞了一个 SmartScheduleClient() 的 robin 算法来更高效地服务客户端。

ftext

flowchart TD
    subgraph one [InitText]
        A["XChangeGC()"]
    end
    subgraph two [DoText]
        B["XDrawString()"]
    end
    subgraph three [ClearTextWin]
        C["XClearWindow()"]
    end
    subgraph four [EndText]
        D["XFreeFont()"]
    end

    one --> two --> three --> four