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#include <X11/X.h>
#include <X11/Xlib.h>
/* Get the metrics for a character. */
typedef struct gs_point_s {
double x, y;
} gs_point;
typedef struct gs_int_point_s {
int x, y;
} gs_int_point;
typedef struct gs_int_rect_s {
gs_int_point p, q;
} gs_int_rect;
int x_char_metrics(XFontStruct* x11font, char chr, gs_point* pwidth, gs_int_rect* pbbox)
{
if (x11font->per_char == NULL) {
pwidth->x = x11font->max_bounds.width;
pwidth->y = 0;
pbbox->p.x = x11font->max_bounds.lbearing;
pbbox->q.x = x11font->max_bounds.rbearing;
pbbox->p.y = -x11font->max_bounds.ascent;
pbbox->q.y = x11font->max_bounds.descent;
} else {
int i = (int)chr - x11font->min_char_or_byte2;
pwidth->x = x11font->per_char[i].width;
pwidth->y = 0;
pbbox->p.x = x11font->per_char[i].lbearing;
pbbox->q.x = x11font->per_char[i].rbearing;
pbbox->p.y = -x11font->per_char[i].ascent;
pbbox->q.y = x11font->per_char[i].descent;
}
return 0;
}
/* Render a character. */
int
x_render_char(Display* dpy, XFontStruct* x11font, char chr, int xo, int yo)
{
gs_int_rect bbox;
int x, y, w, h;
/* Display on an intermediate bitmap, then copy the bits. */
int i;
XImage *xim;
Pixmap xpm;
GC fgc;
gs_point wxy;
int code;
code = x_char_metrics(x11font, chr, &wxy, &bbox);
w = bbox.q.x - bbox.p.x;
h = bbox.q.y - bbox.p.y;
xpm = XCreatePixmap(dpy, InputOnly, w, h, 1);
fgc = XCreateGC(dpy, xpm, None, NULL);
XSetForeground(dpy, fgc, 0);
XFillRectangle(dpy, xpm, fgc, 0, 0, w, h);
XSetForeground(dpy, fgc, 1);
XSetFont(dpy, fgc, x11font->fid);
XDrawString(dpy, xpm, fgc, -bbox.p.x, -bbox.p.y, &chr, 1);
xim = XGetImage(dpy, xpm, 0, 0, w, h, 1, ZPixmap);
i = 0;
for (y = 0; y < h; y++) {
char b;
for (x = 0; x < w; x++) {
b = XGetPixel(xim, x, y);
/* if ((x & 7) == 7)
bits[i++] = b;*/
}
}
XFreePixmap(dpy, xpm);
XFreeGC(dpy, fgc);
XDestroyImage(xim);
return;
}
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