bgiOpenFontDialog

Displays a Windows Font Selection dialog and returns selected font as name,size string. Searches gizmoMap for window ID to get parent HWND. Creates LOGFONT structure initialized with current requestedFont* globals (name, size, bold, italic, underline, strikeout). Creates CHOOSEFONT structure with CF_SCREENFONTS | CF_EFFECTS | CF_INITTOLOGFONTSTRUCT flags, sets initial color from requestedRed/Green/Blue. Calls ChooseFont() to show dialog. If user selects font, stores properties in globals: requestedFontName, requestedFontSize, requestedFontBold, requestedFontItalic, requestedFontUnderline, requestedFontStrikeout. Also stores color in requestedRed/Green/Blue and requestedRedF/GreenF/BlueF. Returns "name,size" string on success, empty string if user cancels or window not found.

This function shows the standard Windows font picker with font list, size, style (bold/italic), effects (underline/strikeout), and color. Dialog initializes with current requested* values, allowing incremental adjustments. Font size conversion uses MulDiv with LOGPIXELSY for DPI-aware sizing. Use bgiGetSelectedFont* functions to retrieve individual properties: bgiGetSelectedFontName(), bgiGetSelectedFontSize(), bgiGetSelectedFontBold(), bgiGetSelectedFontItalic(), bgiGetSelectedFontUnderline(), bgiGetSelectedFontStrikeout(). Dialog also sets color globals accessible via bgiRequestedRed/Green/Blue*. Dialog is modal - blocks until user selects or cancels.