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yath/fttest.c

Created Nov 3, 2017
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/* $ gcc -W -Wall -Wextra -o fttest fttest.c -lX11 -lXft `pkg-config --cflags freetype2`
* $ ./fttest "DejaVu Sans Mono"
* $ ./fttest "Noto Color Emoji"
* X Error of failed request: BadLength (poly request too large or internal Xlib length error)
* Major opcode of failed request: 139 (RENDER)
* Minor opcode of failed request: 20 (RenderAddGlyphs)
* Serial number of failed request: 21
* Current serial number in output stream: 23
*/
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xft/Xft.h>
#define ELEMS(x) (sizeof(x) / sizeof((x)[0]))
XftChar32 msg[] = { ':', ')', ' ', 0x263a }; // ":) ☺"
void redraw(XftDraw *d, XftColor *c, XftFont *f) {
XftDrawString32(d, c, f, 20, 70, msg, ELEMS(msg));
}
int main(int argc, char **argv)
{
Display *display;
XftFont *font;
XftDraw *xftdraw;
XEvent event;
if (argc != 2) {
fprintf(stderr, "Usage: %s <font>\n", argv[0]);
return 1;
}
display = XOpenDisplay(0);
Window w = XCreateSimpleWindow(display, DefaultRootWindow(display), 0, 0, 360, 90, 0, 0, 0);
XMapWindow(display, w);
XSelectInput(display, w, ExposureMask | KeyPressMask);
font = XftFontOpenName(display, 0, argv[1]);
if (!font) {
fprintf(stderr, "XftFontOpenName failed\n");
return 1;
}
xftdraw = XftDrawCreate(display, w, DefaultVisual(display, 0), DefaultColormap(display, 0));
XRenderColor xrcolor = {.red = 0xffff,.alpha = 0xffff };
XftColor xftcolor;
XftColorAllocValue(display, DefaultVisual(display, 0), DefaultColormap(display, 0), &xrcolor, &xftcolor);
redraw(xftdraw, &xftcolor, font);
while (1) {
XNextEvent(display, &event);
if (event.type == Expose)
redraw(xftdraw, &xftcolor, font);
if (event.type == KeyPress)
break;
}
XftColorFree(display, DefaultVisual(display, 0),
DefaultColormap(display, 0), &xftcolor);
XftDrawDestroy(xftdraw);
return 0;
}
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