Detecting ClearType-optimized fonts
- by Josh Kelley
Question:
Is there a way to check if a given font is one of Microsoft's ClearType-optimized fonts?
I guess I could simply hard-code the list of font names, since it's a relatively short list, but that seems a bit ugly. Would the font names be the same regardless of Windows' locale and language settings?
Background:
PuTTY looks really ugly with bold, ClearType-enabled, Consolas text. I decided to play around with the source and see if I could figure out the problem, and I think I tracked it down to the following (abbreviated) code:
font_height = cfg.font.height;
if (font_height > 0) {
font_height =
-MulDiv(font_height, GetDeviceCaps(hdc, LOGPIXELSY), 72);
}
}
font_width = 0;
#define f(i,c,w,u) \
fonts[i] = CreateFont (font_height, font_width, 0, 0, w, FALSE, u, FALSE, \
c, OUT_DEFAULT_PRECIS, \
CLIP_DEFAULT_PRECIS, FONT_QUALITY(cfg.font_quality), \
FIXED_PITCH | FF_DONTCARE, cfg.font.name)
f(FONT_NORMAL, cfg.font.charset, fw_dontcare, FALSE);
SelectObject(hdc, fonts[FONT_NORMAL]);
GetTextMetrics(hdc, &tm);
font_height = tm.tmHeight;
font_width = tm.tmAveCharWidth;
f(FONT_BOLD, cfg.font.charset, fw_bold, FALSE);
The intent is to pick a bold font that fits the same dimensions as the normal font. I'm assuming that PuTTY's Consolas text looks ugly because, since Consolas is so heavily optimized to be layed out on specific pixel boundaries, trying to shoehorn it into arbitrary dimensions produces bad results.
So it seems like an appropriate fix would be to detect ClearType-optimized fonts and try and create the bold versions of those fonts using the same width and height as the initial CreateFont call.
