+ /*
+ * Some fonts, e.g. 9-pt Courier, draw their underlines
+ * outside their character cell. We successfully prevent
+ * screen corruption by clipping the text output, but then
+ * we lose the underline completely. Here we try to work
+ * out whether this is such a font, and if it is, we set a
+ * flag that causes underlines to be drawn by hand.
+ *
+ * Having tried other more sophisticated approaches (such
+ * as examining the TEXTMETRIC structure or requesting the
+ * height of a string), I think we'll do this the brute
+ * force way: we create a small bitmap, draw an underlined
+ * space on it, and test to see whether any pixels are
+ * foreground-coloured. (Since we expect the underline to
+ * go all the way across the character cell, we only search
+ * down a single column of the bitmap, half way across.)
+ */
+ {
+ HDC und_dc;
+ HBITMAP und_bm, und_oldbm;
+ int i, gotit;
+ COLORREF c;
+
+ und_dc = CreateCompatibleDC(hdc);
+ und_bm = CreateCompatibleBitmap(hdc, font_width, font_height);
+ und_oldbm = SelectObject(und_dc, und_bm);
+ SelectObject(und_dc, fonts[FONT_UNDERLINE]);
+ SetTextAlign(und_dc, TA_TOP | TA_LEFT | TA_NOUPDATECP);
+ SetTextColor (und_dc, RGB(255,255,255));
+ SetBkColor (und_dc, RGB(0,0,0));
+ SetBkMode (und_dc, OPAQUE);
+ ExtTextOut (und_dc, 0, 0, ETO_OPAQUE, NULL, " ", 1, NULL);
+ gotit = FALSE;
+ for (i = 0; i < font_height; i++) {
+ c = GetPixel(und_dc, font_width/2, i);
+ if (c != RGB(0,0,0))
+ gotit = TRUE;
+ }
+ SelectObject(und_dc, und_oldbm);
+ DeleteObject(und_bm);
+ DeleteDC(und_dc);
+ font_needs_hand_underlining = !gotit;
+ }
+