Frames are created with whatever is set in the width / height
specification of the default-frame-alist (or whatever is given to
make-frame). These specifications are in characters / lines, not
pixels. I just need to translate to pixels.
For a given frame: use frame-pixel-width / -height. You can always create a
test frame, perhaps invisible, using default-frame-alist, and get its size
in pixels.
But it sounds like you have want to know the pixel size of a frame that
would be created using default-frame-alist, without creating any such frame.
You might try one of these (untested):
- (face-attribute 'default :height t t). This can give you the height of a
font in 1/10 pt, but it can also give you a scale factor instead. To convert
points to pixels, perhaps you can use display-pixels-per-inch plus the
number of points in an inch.
- Get the pixel size from the font name - see pixelsize and x-font-regexp
in faces.el. Multiply by the height parameter in default-frame-alist.
That's all I can think of. Perhaps someone has a simple and direct solution.
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