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PfQueryFonts(), PfQueryFontsCx()

Construct a list of installed fonts

Synopsis:

#include <photon/Pf.h>
int PfQueryFonts( long symbol,
                  unsigned flags,
                  FontDetails list[],
                  int n );

#include <font_api.h>
int PfQueryFontsCx( struct _Pf_ctrl *context,
                    long symbol,
                    unsigned flags,
                    FontDetails list[],
                    int n );

Arguments:

context
(PfQueryFontsCx only) A pointer to the font context to use, returned by PfAttachCx() or PfAttachDllCx().
symbol
The symbol that you want to be able to render, or PHFONT_ALL_SYMBOLS if you don't want to limit the search to fonts that support a specific character.
flags
Flags that you can use to filter the list of fonts; any combination of the following:
list
NULL, or an array of FontDetails structures where the function can store information about the matching fonts; see below.
n
0, or the number of elements in the list.

Library:

PfQueryFonts()
ph
PfQueryFontsCx()
font

Description:

These functions construct a list of all fonts that may be used to render the character specified by the symbol parameter. For example, use 'A' to get a list of normal/Latin fonts, or 0x3A9 (omega) to get a list of Greek fonts. (See PkKeyDef.h or ISO/EIC 10646-1 for a list of symbols.)

Up to n matching font family entries are placed in the user-provided list.


Note: If n is 0 and list is NULL, these functions return the number of matching fonts but don't try to fill in the list. You can use this feature to determine the number of items to allocate for the list.

FontDetails structure

The entries in the list are of type FontDetails, and contain the following fields:

FontDescription desc
Textual name of the font family (e.g. Helvetica).
FontName stem
Base stem of the font family (e.g. helv).
short losize
Lowest point size available for this font. If losize and hisize are both 0, the font is scalable.
short hisize
Highest point size available for this font. If hisize and losize are both 0, the font is scalable.
unsigned short flags
Various stylistic/attribute flags for this font family:

Use PfGenerateFontName() or PfGenerateFontNameCx() and the information in the FontDetails structure to build a font name that you can pass to functions such as PgSetFont().

Returns:

The number of matching fonts found, or -1 on error.

Classification:

Photon

PfQueryFonts()

Safety:
Interrupt handler No
Signal handler No
Thread No

PfQueryFontsCx()

Safety:
Interrupt handler No
Signal handler No
Thread Yes

See also:

PfGenerateFontName(), PfGenerateFontNameCx(), PfQueryFontInfo(), PfQueryFontInfoCx(), PgSetFont()

PtFontSel (in the Photon Widget Reference)

Fonts chapter of the Photon Programmer's Guide


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