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/*
* tkFont.h --
*
* Declarations for interfaces between the generic and platform-
* specific parts of the font package. This information is not
* visible outside of the font package.
*
* Copyright (c) 1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkFont.h,v 1.4 1998/09/14 18:23:10 stanton Exp $
*/
#ifndef _TKFONT
#define _TKFONT
#ifdef BUILD_tk
# undef TCL_STORAGE_CLASS
# define TCL_STORAGE_CLASS DLLEXPORT
#endif
/*
* The following structure keeps track of the attributes of a font. It can
* be used to keep track of either the desired attributes or the actual
* attributes gotten when the font was instantiated.
*/
typedef struct TkFontAttributes {
Tk_Uid family; /* Font family. The most important field. */
int pointsize; /* Pointsize of font, 0 for default size, or
* negative number meaning pixel size. */
int weight; /* Weight flag; see below for def'n. */
int slant; /* Slant flag; see below for def'n. */
int underline; /* Non-zero for underline font. */
int overstrike; /* Non-zero for overstrike font. */
} TkFontAttributes;
/*
* Possible values for the "weight" field in a TkFontAttributes structure.
* Weight is a subjective term and depends on what the company that created
* the font considers bold.
*/
#define TK_FW_NORMAL 0
#define TK_FW_BOLD 1
#define TK_FW_UNKNOWN -1 /* Unknown weight. This value is used for
* error checking and is never actually stored
* in the weight field. */
/*
* Possible values for the "slant" field in a TkFontAttributes structure.
*/
#define TK_FS_ROMAN 0
#define TK_FS_ITALIC 1
#define TK_FS_OBLIQUE 2 /* This value is only used when parsing X
* font names to determine the closest
* match. It is only stored in the
* XLFDAttributes structure, never in the
* slant field of the TkFontAttributes. */
#define TK_FS_UNKNOWN -1 /* Unknown slant. This value is used for
* error checking and is never actually stored
* in the slant field. */
/*
* The following structure keeps track of the metrics for an instantiated
* font. The metrics are the physical properties of the font itself.
*/
typedef struct TkFontMetrics {
int ascent; /* From baseline to top of font. */
int descent; /* From baseline to bottom of font. */
int maxWidth; /* Width of widest character in font. */
int fixed; /* Non-zero if this is a fixed-width font,
* 0 otherwise. */
} TkFontMetrics;
/*
* The following structure is used to keep track of the generic information
* about a font. Each platform-specific font is represented by a structure
* with the following structure at its beginning, plus any platform-
* specific stuff after that.
*/
typedef struct TkFont {
/*
* Fields used and maintained exclusively by generic code.
*/
int refCount; /* Number of users of the TkFont. */
Tcl_HashEntry *cacheHashPtr;/* Entry in font cache for this structure,
* used when deleting it. */
Tcl_HashEntry *namedHashPtr;/* Pointer to hash table entry that
* corresponds to the named font that the
* tkfont was based on, or NULL if the tkfont
* was not based on a named font. */
int tabWidth; /* Width of tabs in this font (pixels). */
int underlinePos; /* Offset from baseline to origin of
* underline bar (used for drawing underlines
* on a non-underlined font). */
int underlineHeight; /* Height of underline bar (used for drawing
* underlines on a non-underlined font). */
/*
* Fields in the generic font structure that are filled in by
* platform-specific code.
*/
Font fid; /* For backwards compatibility with XGCValues
* structures. Remove when TkGCValues is
* implemented. */
TkFontAttributes fa; /* Actual font attributes obtained when the
* the font was created, as opposed to the
* desired attributes passed in to
* TkpGetFontFromAttributes(). The desired
* metrics can be determined from the string
* that was used to create this font. */
TkFontMetrics fm; /* Font metrics determined when font was
* created. */
} TkFont;
/*
* The following structure is used to return attributes when parsing an
* XLFD. The extra information is of interest to the Unix-specific code
* when attempting to find the closest matching font.
*/
typedef struct TkXLFDAttributes {
TkFontAttributes fa; /* Standard set of font attributes. */
Tk_Uid foundry; /* The foundry of the font. */
int slant; /* The tristate value for the slant, which
* is significant under X. */
int setwidth; /* The proportionate width, see below for
* definition. */
int charset; /* The character set encoding (the glyph
* family), see below for definition. */
int encoding; /* Variations within a charset for the
* glyphs above character 127. */
} TkXLFDAttributes;
/*
* Possible values for the "setwidth" field in a TkXLFDAttributes structure.
* The setwidth is whether characters are considered wider or narrower than
* normal.
*/
#define TK_SW_NORMAL 0
#define TK_SW_CONDENSE 1
#define TK_SW_EXPAND 2
#define TK_SW_UNKNOWN 3 /* Unknown setwidth. This value may be
* stored in the setwidth field. */
/*
* Possible values for the "charset" field in a TkXLFDAttributes structure.
* The charset is the set of glyphs that are used in the font.
*/
#define TK_CS_NORMAL 0
#define TK_CS_SYMBOL 1
#define TK_CS_OTHER 2
/*
* The following defines specify the meaning of the fields in a fully
* qualified XLFD.
*/
#define XLFD_FOUNDRY 0
#define XLFD_FAMILY 1
#define XLFD_WEIGHT 2
#define XLFD_SLANT 3
#define XLFD_SETWIDTH 4
#define XLFD_ADD_STYLE 5
#define XLFD_PIXEL_SIZE 6
#define XLFD_POINT_SIZE 7
#define XLFD_RESOLUTION_X 8
#define XLFD_RESOLUTION_Y 9
#define XLFD_SPACING 10
#define XLFD_AVERAGE_WIDTH 11
#define XLFD_REGISTRY 12
#define XLFD_ENCODING 13
#define XLFD_NUMFIELDS 14 /* Number of fields in XLFD. */
/*
* Exported from generic code to platform-specific code.
*/
EXTERN int TkCreateNamedFont _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Window tkwin, CONST char *name,
TkFontAttributes *faPtr));
EXTERN void TkInitFontAttributes _ANSI_ARGS_((
TkFontAttributes *faPtr));
EXTERN int TkParseXLFD _ANSI_ARGS_((CONST char *string,
TkXLFDAttributes *xaPtr));
/*
* Common APIs exported to tkFont.c from all platform-specific
* implementations.
*/
EXTERN void TkpDeleteFont _ANSI_ARGS_((TkFont *tkFontPtr));
EXTERN TkFont * TkpGetFontFromAttributes _ANSI_ARGS_((
TkFont *tkFontPtr, Tk_Window tkwin,
CONST TkFontAttributes *faPtr));
EXTERN void TkpGetFontFamilies _ANSI_ARGS_((Tcl_Interp *interp,
Tk_Window tkwin));
EXTERN TkFont * TkpGetNativeFont _ANSI_ARGS_((Tk_Window tkwin,
CONST char *name));
# undef TCL_STORAGE_CLASS
# define TCL_STORAGE_CLASS DLLIMPORT
#endif /* _TKFONT */
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