Attachment 239150 Details for Bug 268668 – Test program used to produce the two screenshots

Test program used to produce the two screenshots

xftest.c (text/plain), 3.87 KB, created by Bertrand Petit on 2022-12-31 11:28:43 UTC

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Creator: Bertrand Petit

Created: 2022-12-31 11:28:43 UTC

Size: 3.87 KB

patch

obsolete

>/* Inspired by the following documents:
> * https://keithp.com/~keithp/render/Xft.tutorial
> * https://www.geeks3d.com/20120102/programming-tutorial-simple-x11-x-window-code-sample-for-linux-and-mac-os-x/
> * https://github.com/jsynacek/xft-example/blob/master/main.c
> */
>
>#include <stdbool.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>
>#include <X11/Xlib.h>
>#include <X11/Xos.h>
>#include <X11/Xutil.h>
>#include <X11/Xft/Xft.h>
>
>int main(int argc, char **argv)
>{
>	const char *TextSample="minimum";
>	size_t TextSampleSize=strlen(TextSample);
>	const char *FontName=argc>1 ? argv[1] : "Sans Serif-48";
>
>	const int LineHeight=12;
>	const int LineSkip=4;
>	const int Ystart=LineHeight+5;
>
>	char StrBuf[1024]; /* Unparsed font names can be quite large. */
>
>	Display *Dpy = XOpenDisplay(NULL);
>	if(Dpy==NULL)
>	{
>		perror("Cannot open display");
>		exit(1);
>	}
>	if(!XftDefaultHasRender(Dpy))
>	{
>		perror("Display does not support the X Render extension");
>		exit(1);
>	}
>
>	int Scr=DefaultScreen(Dpy);
>	Visual *Vis=DefaultVisual(Dpy, Scr);
>    Colormap Cmap=DefaultColormap(Dpy, Scr);
>
>	Window Win=XCreateSimpleWindow(Dpy, RootWindow(Dpy, Scr),
>								   10, 10, 325, 148,
>								   1,
>                                   BlackPixel(Dpy, Scr), WhitePixel(Dpy, Scr));
>	XSelectInput(Dpy, Win, ExposureMask | KeyPressMask);
>	XStoreName(Dpy, Win, "Xft test");
>
>	Atom WM_DELETE_WINDOW = XInternAtom(Dpy, "WM_DELETE_WINDOW", False);
>	XSetWMProtocols(Dpy, Win, &WM_DELETE_WINDOW, 1);
>
>	XMapWindow(Dpy, Win);
>
>	// Used to clear the window on expose events
>	GC PaperGC=XCreateGC(Dpy, Win, 0, NULL);
>	XSetForeground(Dpy, PaperGC, WhitePixel(Dpy, Scr));
>
>	// Used for ancillary text
>	GC InkGC=XCreateGC(Dpy, Win, 0, NULL);
>	XSetForeground(Dpy, InkGC, BlackPixel(Dpy, Scr));
>
>	// Used for Xft text sample
>	XftDraw *Draw=XftDrawCreate(Dpy, Win, Vis, Cmap);
>	XftColor DrawColor;
>	memset(&DrawColor, 0, sizeof(DrawColor));
>	bool ColorAllocated=XftColorAllocName(Dpy, Vis, Cmap, "black", &DrawColor);
>	if(!ColorAllocated)
>		perror("can't allocate the black color for Xft drawing");
>
>	XftFont *Font=XftFontOpenName(Dpy, Scr, FontName);
>	XGlyphInfo Extents;
>	if(Font==NULL)
>		perror("can't load font");
>	else
>	{
>		*StrBuf=0;
>		XftNameUnparse(Font->pattern, StrBuf, sizeof(StrBuf)-1);
>		printf("loaded font: \"%s\"\n", StrBuf);
>
>		memset(&Extents, 0, sizeof(Extents));
>		XftTextExtents8(Dpy, Font, (const FcChar8 *)TextSample, TextSampleSize,
>						&Extents);
>	}
>
>	while(ColorAllocated && Font!=NULL)
>	{
>		XEvent Evt;
>		memset(&Evt, 0, sizeof(Evt));
>		XNextEvent(Dpy, &Evt);
>
>		if(Evt.type==Expose)
>		{
>			XWindowAttributes WinAttrs;
>			memset(&WinAttrs, 0, sizeof(WinAttrs));
>			XGetWindowAttributes(Dpy, Win, &WinAttrs);
>			XFillRectangle(Dpy, Win, PaperGC,
>						   0, 0, WinAttrs.width, WinAttrs.height);
>
>			int Ypos=Ystart;
>			snprintf(StrBuf, sizeof(StrBuf)-1, "Xft v%d.%d.%d",
>					 XFT_MAJOR, XFT_MINOR, XFT_REVISION);
>			XDrawString(Dpy, Win, InkGC,
>						10, Ypos,
>						StrBuf, strlen(StrBuf));
>
>			Ypos+=LineHeight+LineSkip;
>			snprintf(StrBuf, sizeof(StrBuf)-1, "fontconfig v%d.%d.%d",
>					 FC_MAJOR, FC_MINOR, FC_REVISION);
>			XDrawString(Dpy, Win, InkGC,
>						10, Ypos,
>						StrBuf, strlen(StrBuf));
>
>			Ypos+=Extents.height+LineSkip*3;
>			XftDrawString8(Draw, &DrawColor, Font, 10, Ypos,
>						   (const FcChar8 *)TextSample, TextSampleSize);
>		}
>		else if(Evt.type==KeyPress)
>		{
>			*StrBuf=0;
>			KeySym Keysym;
>			int len=XLookupString(&Evt.xkey, StrBuf, sizeof(StrBuf),
>									&Keysym, NULL);
>			if (Keysym==XK_Escape)
>				break;
>		}
>		else if(Evt.type==ClientMessage &&
>				Evt.xclient.data.l[0]==WM_DELETE_WINDOW)
>			break;
>	}
>
>	if(Font!=NULL)
>		XftFontClose(Dpy, Font);
>	if(ColorAllocated)
>		XftColorFree(Dpy, Vis, Cmap, &DrawColor);
>	XftDrawDestroy(Draw);
>	XFreeGC(Dpy, InkGC);
>	XFreeGC(Dpy, PaperGC);
>	XDestroyWindow(Dpy, Win);
>	XCloseDisplay(Dpy);
>	return 0;
>}
>
>/*
> * Local Variables:
> * mode: c
> * c-basic-offset: 4
> * tab-width: 4
> * End:
> */

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Attachments on bug 268668: 239148 | 239149 | 239150 | 239151 | 239265 | 239266