/* * 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. * * SCCS: @(#) tkFont.h 1.11 97/05/07 14:44:13 */ #ifndef _TKFONT #define _TKFONT /* * 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)); #endif /* _TKFONT */