Finding size of system font?

Is there a nice way to find the size of the system fonts on os4?
I need to check if the font is under a certain size, if so then not let the gadget be that small. Using C programming.

Please define "system" font.

Please define "size".

The font that usually is called the "system font" is the fixed-width font you define in Prefs/Font. It is the default font for all RastPorts, but it is not used for GUI elements. The default font for GUI elements is the screen font. You can get it from Screen->RastPort.Font (pointer to struct TextFont) or Screen->Font (pointer to struct TextAttr).

The size of a font usually means its height. Therefore you can get the size of a font from TextFont->tf_YSize or TextAttr->ta_YSize. Or Screen->RastPort.TxHeight.

If you want the width of a given text you should use the TextLength function.

Some fonts, especially outline fonts, might need more pixels than derived from TxHeight / TextLength. To get the real area a given text needs to be printed, you should use the TextExtent function.

Yep, it's the height of the font i need. Where in the autodocs is this information at? Could not find anything about anything really.

Quote:

Not so much in the autodocs as the includes

check out the various structures defined in graphics/text.h

What gadget anyway?

@Antique
Check out the autodocs for Intuition GetScreenAttr() and the SA_Font TAG in the includes.

This seems to do the trick for me....

struct Screen *screen = NULL;
screen = LockPubScreen(NULL);
printf("fonthoyde=%i",screen->Font->ta_YSize);