tkUnixFont.c
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- /*
- * tkUnixFont.c --
- *
- * Contains the Unix implementation of the platform-independant
- * font package interface.
- *
- * Copyright (c) 1996-1997 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: tkUnixFont.c,v 1.18.2.6 2006/10/05 21:28:17 hobbs Exp $
- */
-
- #include "tkUnixInt.h"
- #include "tkFont.h"
- #include <netinet/in.h> /* for htons() prototype */
- #include <arpa/inet.h> /* inet_ntoa() */
- /*
- * The preferred font encodings.
- */
- static CONST char *encodingList[] = {
- "iso8859-1", "jis0208", "jis0212", NULL
- };
- /*
- * The following structure represents a font family. It is assumed that
- * all screen fonts constructed from the same "font family" share certain
- * properties; all screen fonts with the same "font family" point to a
- * shared instance of this structure. The most important shared property
- * is the character existence metrics, used to determine if a screen font
- * can display a given Unicode character.
- *
- * Under Unix, there are three attributes that uniquely identify a "font
- * family": the foundry, face name, and charset.
- */
- #define FONTMAP_SHIFT 10
- #define FONTMAP_PAGES (1 << (sizeof(Tcl_UniChar)*8 - FONTMAP_SHIFT))
- #define FONTMAP_BITSPERPAGE (1 << FONTMAP_SHIFT)
- typedef struct FontFamily {
- struct FontFamily *nextPtr; /* Next in list of all known font families. */
- int refCount; /* How many SubFonts are referring to this
- * FontFamily. When the refCount drops to
- * zero, this FontFamily may be freed. */
- /*
- * Key.
- */
- Tk_Uid foundry; /* Foundry key for this FontFamily. */
- Tk_Uid faceName; /* Face name key for this FontFamily. */
- Tcl_Encoding encoding; /* Encoding key for this FontFamily. */
- /*
- * Derived properties.
- */
- int isTwoByteFont; /* 1 if this is a double-byte font, 0
- * otherwise. */
- char *fontMap[FONTMAP_PAGES];
- /* Two-level sparse table used to determine
- * quickly if the specified character exists.
- * As characters are encountered, more pages
- * in this table are dynamically alloced. The
- * contents of each page is a bitmask
- * consisting of FONTMAP_BITSPERPAGE bits,
- * representing whether this font can be used
- * to display the given character at the
- * corresponding bit position. The high bits
- * of the character are used to pick which
- * page of the table is used. */
- } FontFamily;
- /*
- * The following structure encapsulates an individual screen font. A font
- * object is made up of however many SubFonts are necessary to display a
- * stream of multilingual characters.
- */
- typedef struct SubFont {
- char **fontMap; /* Pointer to font map from the FontFamily,
- * cached here to save a dereference. */
- XFontStruct *fontStructPtr; /* The specific screen font that will be
- * used when displaying/measuring chars
- * belonging to the FontFamily. */
- FontFamily *familyPtr; /* The FontFamily for this SubFont. */
- } SubFont;
- /*
- * The following structure represents Unix's implementation of a font
- * object.
- */
-
- #define SUBFONT_SPACE 3
- #define BASE_CHARS 256
- typedef struct UnixFont {
- TkFont font; /* Stuff used by generic font package. Must
- * be first in structure. */
- SubFont staticSubFonts[SUBFONT_SPACE];
- /* Builtin space for a limited number of
- * SubFonts. */
- int numSubFonts; /* Length of following array. */
- SubFont *subFontArray; /* Array of SubFonts that have been loaded
- * in order to draw/measure all the characters
- * encountered by this font so far. All fonts
- * start off with one SubFont initialized by
- * AllocFont() from the original set of font
- * attributes. Usually points to
- * staticSubFonts, but may point to malloced
- * space if there are lots of SubFonts. */
- SubFont controlSubFont; /* Font to use to display control-character
- * expansions. */
- Display *display; /* Display that owns font. */
- int pixelSize; /* Original pixel size used when font was
- * constructed. */
- TkXLFDAttributes xa; /* Additional attributes that specify the
- * preferred foundry and encoding to use when
- * constructing additional SubFonts. */
- int widths[BASE_CHARS]; /* Widths of first 256 chars in the base
- * font, for handling common case. */
- int underlinePos; /* Offset from baseline to origin of
- * underline bar (used when drawing underlined
- * font) (pixels). */
- int barHeight; /* Height of underline or overstrike bar
- * (used when drawing underlined or strikeout
- * font) (pixels). */
- } UnixFont;
- /*
- * The following structure and definition is used to keep track of the
- * alternative names for various encodings. Asking for an encoding that
- * matches one of the alias patterns will result in actually getting the
- * encoding by its real name.
- */
-
- typedef struct EncodingAlias {
- char *realName; /* The real name of the encoding to load if
- * the provided name matched the pattern. */
- char *aliasPattern; /* Pattern for encoding name, of the form
- * that is acceptable to Tcl_StringMatch. */
- } EncodingAlias;
- /*
- * Just some utility structures used for passing around values in helper
- * procedures.
- */
-
- typedef struct FontAttributes {
- TkFontAttributes fa;
- TkXLFDAttributes xa;
- } FontAttributes;
- typedef struct ThreadSpecificData {
- FontFamily *fontFamilyList; /* The list of font families that are
- * currently loaded. As screen fonts
- * are loaded, this list grows to hold
- * information about what characters
- * exist in each font family. */
- FontFamily controlFamily; /* FontFamily used to handle control
- * character expansions. The encoding
- * of this FontFamily converts UTF-8 to
- * backslashed escape sequences. */
- } ThreadSpecificData;
- static Tcl_ThreadDataKey dataKey;
- /*
- * The set of builtin encoding alises to convert the XLFD names for the
- * encodings into the names expected by the Tcl encoding package.
- */
-
- static EncodingAlias encodingAliases[] = {
- {"gb2312-raw", "gb2312*"},
- {"big5", "big5*"},
- {"cns11643-1", "cns11643*-1"},
- {"cns11643-1", "cns11643*.1-0"},
- {"cns11643-2", "cns11643*-2"},
- {"cns11643-2", "cns11643*.2-0"},
- {"jis0201", "jisx0201*"},
- {"jis0201", "jisx0202*"},
- {"jis0208", "jisc6226*"},
- {"jis0208", "jisx0208*"},
- {"jis0212", "jisx0212*"},
- {"tis620", "tis620*"},
- {"ksc5601", "ksc5601*"},
- {"dingbats", "*dingbats"},
- #ifdef WORDS_BIGENDIAN
- {"unicode", "iso10646-1"},
- #else
- /*
- * ucs-2be is needed if native order isn't BE.
- */
- {"ucs-2be", "iso10646-1"},
- #endif
- {NULL, NULL}
- };
- /*
- * Procedures used only in this file.
- */
- static void FontPkgCleanup _ANSI_ARGS_((ClientData clientData));
- static FontFamily * AllocFontFamily _ANSI_ARGS_((Display *display,
- XFontStruct *fontStructPtr, int base));
- static SubFont * CanUseFallback _ANSI_ARGS_((UnixFont *fontPtr,
- CONST char *fallbackName, int ch,
- SubFont **fixSubFontPtrPtr));
- static SubFont * CanUseFallbackWithAliases _ANSI_ARGS_((
- UnixFont *fontPtr, char *fallbackName,
- int ch, Tcl_DString *nameTriedPtr,
- SubFont **fixSubFontPtrPtr));
- static int ControlUtfProc _ANSI_ARGS_((ClientData clientData,
- CONST char *src, int srcLen, int flags,
- Tcl_EncodingState *statePtr, char *dst,
- int dstLen, int *srcReadPtr, int *dstWrotePtr,
- int *dstCharsPtr));
- static XFontStruct * CreateClosestFont _ANSI_ARGS_((Tk_Window tkwin,
- CONST TkFontAttributes *faPtr,
- CONST TkXLFDAttributes *xaPtr));
- static SubFont * FindSubFontForChar _ANSI_ARGS_((UnixFont *fontPtr,
- int ch, SubFont **fixSubFontPtrPtr));
- static void FontMapInsert _ANSI_ARGS_((SubFont *subFontPtr,
- int ch));
- static void FontMapLoadPage _ANSI_ARGS_((SubFont *subFontPtr,
- int row));
- static int FontMapLookup _ANSI_ARGS_((SubFont *subFontPtr,
- int ch));
- static void FreeFontFamily _ANSI_ARGS_((FontFamily *afPtr));
- static CONST char * GetEncodingAlias _ANSI_ARGS_((CONST char *name));
- static int GetFontAttributes _ANSI_ARGS_((Display *display,
- XFontStruct *fontStructPtr, FontAttributes *faPtr));
- static XFontStruct * GetScreenFont _ANSI_ARGS_((Display *display,
- FontAttributes *wantPtr, char **nameList,
- int bestIdx[], unsigned int bestScore[]));
- static XFontStruct * GetSystemFont _ANSI_ARGS_((Display *display));
- static int IdentifySymbolEncodings _ANSI_ARGS_((
- FontAttributes *faPtr));
- static void InitFont _ANSI_ARGS_((Tk_Window tkwin,
- XFontStruct *fontStructPtr, UnixFont *fontPtr));
- static void InitSubFont _ANSI_ARGS_((Display *display,
- XFontStruct *fontStructPtr, int base,
- SubFont *subFontPtr));
- static char ** ListFonts _ANSI_ARGS_((Display *display,
- CONST char *faceName, int *numNamesPtr));
- static char ** ListFontOrAlias _ANSI_ARGS_((Display *display,
- CONST char *faceName, int *numNamesPtr));
- static unsigned int RankAttributes _ANSI_ARGS_((FontAttributes *wantPtr,
- FontAttributes *gotPtr));
- static void ReleaseFont _ANSI_ARGS_((UnixFont *fontPtr));
- static void ReleaseSubFont _ANSI_ARGS_((Display *display,
- SubFont *subFontPtr));
- static int SeenName _ANSI_ARGS_((CONST char *name,
- Tcl_DString *dsPtr));
- #ifndef WORDS_BIGENDIAN
- static int Ucs2beToUtfProc _ANSI_ARGS_((ClientData clientData,
- CONST char *src, int srcLen, int flags,
- Tcl_EncodingState *statePtr, char *dst, int dstLen,
- int *srcReadPtr, int *dstWrotePtr,
- int *dstCharsPtr));
- static int UtfToUcs2beProc _ANSI_ARGS_((ClientData clientData,
- CONST char *src, int srcLen, int flags,
- Tcl_EncodingState *statePtr, char *dst, int dstLen,
- int *srcReadPtr, int *dstWrotePtr,
- int *dstCharsPtr));
- #endif
- /*
- *-------------------------------------------------------------------------
- *
- * FontPkgCleanup --
- *
- * This procedure is called when an application is created. It
- * initializes all the structures that are used by the
- * platform-dependent code on a per application basis.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Releases thread-specific resources used by font pkg.
- *
- *-------------------------------------------------------------------------
- */
- static void
- FontPkgCleanup(ClientData clientData)
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
-
- if (tsdPtr->controlFamily.encoding != NULL) {
- FontFamily *familyPtr = &tsdPtr->controlFamily;
- int i;
- Tcl_FreeEncoding(familyPtr->encoding);
- for (i = 0; i < FONTMAP_PAGES; i++) {
- if (familyPtr->fontMap[i] != NULL) {
- ckfree(familyPtr->fontMap[i]);
- }
- }
- tsdPtr->controlFamily.encoding = NULL;
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * TkpFontPkgInit --
- *
- * This procedure is called when an application is created. It
- * initializes all the structures that are used by the
- * platform-dependent code on a per application basis.
- *
- * Results:
- * None.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- void
- TkpFontPkgInit(mainPtr)
- TkMainInfo *mainPtr; /* The application being created. */
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- Tcl_EncodingType type;
- SubFont dummy;
- int i;
- if (tsdPtr->controlFamily.encoding == NULL) {
- type.encodingName = "X11ControlChars";
- type.toUtfProc = ControlUtfProc;
- type.fromUtfProc = ControlUtfProc;
- type.freeProc = NULL;
- type.clientData = NULL;
- type.nullSize = 0;
- tsdPtr->controlFamily.refCount = 2;
- tsdPtr->controlFamily.encoding = Tcl_CreateEncoding(&type);
- tsdPtr->controlFamily.isTwoByteFont = 0;
- dummy.familyPtr = &tsdPtr->controlFamily;
- dummy.fontMap = tsdPtr->controlFamily.fontMap;
- for (i = 0x00; i < 0x20; i++) {
- FontMapInsert(&dummy, i);
- FontMapInsert(&dummy, i + 0x80);
- }
- #ifndef WORDS_BIGENDIAN
- /*
- * UCS-2BE is unicode (UCS-2) in big-endian format. Define this
- * if native order isn't BE. It is used in iso10646 fonts.
- */
- type.encodingName = "ucs-2be";
- type.toUtfProc = Ucs2beToUtfProc;
- type.fromUtfProc = UtfToUcs2beProc;
- type.freeProc = NULL;
- type.clientData = NULL;
- type.nullSize = 2;
- Tcl_CreateEncoding(&type);
- #endif
- Tcl_CreateThreadExitHandler(FontPkgCleanup, NULL);
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * ControlUtfProc --
- *
- * Convert from UTF-8 into the ASCII expansion of a control
- * character.
- *
- * Results:
- * Returns TCL_OK if conversion was successful.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- static int
- ControlUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
- srcReadPtr, dstWrotePtr, dstCharsPtr)
- ClientData clientData; /* Not used. */
- CONST char *src; /* Source string in UTF-8. */
- int srcLen; /* Source string length in bytes. */
- int flags; /* Conversion control flags. */
- Tcl_EncodingState *statePtr;/* Place for conversion routine to store
- * state information used during a piecewise
- * conversion. Contents of statePtr are
- * initialized and/or reset by conversion
- * routine under control of flags argument. */
- char *dst; /* Output buffer in which converted string
- * is stored. */
- int dstLen; /* The maximum length of output buffer in
- * bytes. */
- int *srcReadPtr; /* Filled with the number of bytes from the
- * source string that were converted. This
- * may be less than the original source length
- * if there was a problem converting some
- * source characters. */
- int *dstWrotePtr; /* Filled with the number of bytes that were
- * stored in the output buffer as a result of
- * the conversion. */
- int *dstCharsPtr; /* Filled with the number of characters that
- * correspond to the bytes stored in the
- * output buffer. */
- {
- CONST char *srcStart, *srcEnd;
- char *dstStart, *dstEnd;
- Tcl_UniChar ch;
- int result;
- static char hexChars[] = "0123456789abcdef";
- static char mapChars[] = {
- 0, 0, 0, 0, 0, 0, 0,
- 'a', 'b', 't', 'n', 'v', 'f', 'r'
- };
- result = TCL_OK;
- srcStart = src;
- srcEnd = src + srcLen;
- dstStart = dst;
- dstEnd = dst + dstLen - 6;
- for ( ; src < srcEnd; ) {
- if (dst > dstEnd) {
- result = TCL_CONVERT_NOSPACE;
- break;
- }
- src += Tcl_UtfToUniChar(src, &ch);
- dst[0] = '\';
- if ((ch < sizeof(mapChars)) && (mapChars[ch] != 0)) {
- dst[1] = mapChars[ch];
- dst += 2;
- } else if (ch < 256) {
- dst[1] = 'x';
- dst[2] = hexChars[(ch >> 4) & 0xf];
- dst[3] = hexChars[ch & 0xf];
- dst += 4;
- } else {
- dst[1] = 'u';
- dst[2] = hexChars[(ch >> 12) & 0xf];
- dst[3] = hexChars[(ch >> 8) & 0xf];
- dst[4] = hexChars[(ch >> 4) & 0xf];
- dst[5] = hexChars[ch & 0xf];
- dst += 6;
- }
- }
- *srcReadPtr = src - srcStart;
- *dstWrotePtr = dst - dstStart;
- *dstCharsPtr = dst - dstStart;
- return result;
- }
- #ifndef WORDS_BIGENDIAN
- /*
- *-------------------------------------------------------------------------
- *
- * Ucs2beToUtfProc --
- *
- * Convert from UCS-2BE (big-endian 16-bit Unicode) to UTF-8.
- * This is only defined on LE machines.
- *
- * Results:
- * Returns TCL_OK if conversion was successful.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- static int
- Ucs2beToUtfProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
- srcReadPtr, dstWrotePtr, dstCharsPtr)
- ClientData clientData; /* Not used. */
- CONST char *src; /* Source string in Unicode. */
- int srcLen; /* Source string length in bytes. */
- int flags; /* Conversion control flags. */
- Tcl_EncodingState *statePtr;/* Place for conversion routine to store
- * state information used during a piecewise
- * conversion. Contents of statePtr are
- * initialized and/or reset by conversion
- * routine under control of flags argument. */
- char *dst; /* Output buffer in which converted string
- * is stored. */
- int dstLen; /* The maximum length of output buffer in
- * bytes. */
- int *srcReadPtr; /* Filled with the number of bytes from the
- * source string that were converted. This
- * may be less than the original source length
- * if there was a problem converting some
- * source characters. */
- int *dstWrotePtr; /* Filled with the number of bytes that were
- * stored in the output buffer as a result of
- * the conversion. */
- int *dstCharsPtr; /* Filled with the number of characters that
- * correspond to the bytes stored in the
- * output buffer. */
- {
- CONST char *srcStart, *srcEnd;
- char *dstEnd, *dstStart;
- int result, numChars;
- result = TCL_OK;
- /* check alignment with ucs-2 (2 == sizeof(UCS-2)) */
- if ((srcLen % 2) != 0) {
- result = TCL_CONVERT_MULTIBYTE;
- srcLen--;
- }
- srcStart = src;
- srcEnd = src + srcLen;
- dstStart = dst;
- dstEnd = dst + dstLen - TCL_UTF_MAX;
- for (numChars = 0; src < srcEnd; numChars++) {
- if (dst > dstEnd) {
- result = TCL_CONVERT_NOSPACE;
- break;
- }
- /*
- * Need to swap byte-order on little-endian machines (x86) for
- * UCS-2BE. We know this is an LE->BE swap.
- */
- dst += Tcl_UniCharToUtf(htons(*((short *)src)), dst);
- src += 2 /* sizeof(UCS-2) */;
- }
- *srcReadPtr = src - srcStart;
- *dstWrotePtr = dst - dstStart;
- *dstCharsPtr = numChars;
- return result;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * UtfToUcs2beProc --
- *
- * Convert from UTF-8 to UCS-2BE (fixed 2-byte encoding).
- *
- * Results:
- * Returns TCL_OK if conversion was successful.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- static int
- UtfToUcs2beProc(clientData, src, srcLen, flags, statePtr, dst, dstLen,
- srcReadPtr, dstWrotePtr, dstCharsPtr)
- ClientData clientData; /* TableEncodingData that specifies encoding. */
- CONST char *src; /* Source string in UTF-8. */
- int srcLen; /* Source string length in bytes. */
- int flags; /* Conversion control flags. */
- Tcl_EncodingState *statePtr;/* Place for conversion routine to store
- * state information used during a piecewise
- * conversion. Contents of statePtr are
- * initialized and/or reset by conversion
- * routine under control of flags argument. */
- char *dst; /* Output buffer in which converted string
- * is stored. */
- int dstLen; /* The maximum length of output buffer in
- * bytes. */
- int *srcReadPtr; /* Filled with the number of bytes from the
- * source string that were converted. This
- * may be less than the original source length
- * if there was a problem converting some
- * source characters. */
- int *dstWrotePtr; /* Filled with the number of bytes that were
- * stored in the output buffer as a result of
- * the conversion. */
- int *dstCharsPtr; /* Filled with the number of characters that
- * correspond to the bytes stored in the
- * output buffer. */
- {
- CONST char *srcStart, *srcEnd, *srcClose, *dstStart, *dstEnd;
- int result, numChars;
- Tcl_UniChar ch;
- srcStart = src;
- srcEnd = src + srcLen;
- srcClose = srcEnd;
- if ((flags & TCL_ENCODING_END) == 0) {
- srcClose -= TCL_UTF_MAX;
- }
- dstStart = dst;
- dstEnd = dst + dstLen - 2 /* sizeof(UCS-2) */;
- result = TCL_OK;
- for (numChars = 0; src < srcEnd; numChars++) {
- if ((src > srcClose) && (!Tcl_UtfCharComplete(src, srcEnd - src))) {
- /*
- * If there is more string to follow, this will ensure that the
- * last UTF-8 character in the source buffer hasn't been cut off.
- */
- result = TCL_CONVERT_MULTIBYTE;
- break;
- }
- if (dst > dstEnd) {
- result = TCL_CONVERT_NOSPACE;
- break;
- }
- src += Tcl_UtfToUniChar(src, &ch);
- /*
- * Ensure big-endianness (store big bits first).
- * XXX: This hard-codes the assumed size of Tcl_UniChar as 2.
- * Make sure to work in char* for Tcl_UtfToUniChar alignment.
- * [Bug 1122671]
- */
- *dst++ = (ch >> 8);
- *dst++ = (ch & 0xFF);
- }
- *srcReadPtr = src - srcStart;
- *dstWrotePtr = dst - dstStart;
- *dstCharsPtr = numChars;
- return result;
- }
- #endif /* WORDS_BIGENDIAN */
- /*
- *---------------------------------------------------------------------------
- *
- * TkpGetNativeFont --
- *
- * Map a platform-specific native font name to a TkFont.
- *
- * Results:
- * The return value is a pointer to a TkFont that represents the
- * native font. If a native font by the given name could not be
- * found, the return value is NULL.
- *
- * Every call to this procedure returns a new TkFont structure,
- * even if the name has already been seen before. The caller should
- * call TkpDeleteFont() when the font is no longer needed.
- *
- * The caller is responsible for initializing the memory associated
- * with the generic TkFont when this function returns and releasing
- * the contents of the generic TkFont before calling TkpDeleteFont().
- *
- * Side effects:
- * Memory allocated.
- *
- *---------------------------------------------------------------------------
- */
-
- TkFont *
- TkpGetNativeFont(tkwin, name)
- Tk_Window tkwin; /* For display where font will be used. */
- CONST char *name; /* Platform-specific font name. */
- {
- UnixFont *fontPtr;
- XFontStruct *fontStructPtr;
- FontAttributes fa;
- CONST char *p;
- int hasSpace, dashes, hasWild;
- /*
- * The behavior of X when given a name that isn't an XLFD is unspecified.
- * For example, Exceed 6 returns a valid font for any random string. This
- * is awkward since system names have higher priority than the other Tk
- * font syntaxes. So, we need to perform a quick sanity check on the
- * name and fail if it looks suspicious. We fail if the name:
- * - contains a space immediately before a dash
- * - contains a space, but no '*' characters and fewer than 14 dashes
- */
- hasSpace = dashes = hasWild = 0;
- for (p = name; *p != ' '; p++) {
- if (*p == ' ') {
- if (p[1] == '-') {
- return NULL;
- }
- hasSpace = 1;
- } else if (*p == '-') {
- dashes++;
- } else if (*p == '*') {
- hasWild = 1;
- }
- }
- if ((dashes < 14) && !hasWild && hasSpace) {
- return NULL;
- }
- fontStructPtr = XLoadQueryFont(Tk_Display(tkwin), name);
- if (fontStructPtr == NULL) {
- /*
- * Handle all names that look like XLFDs here. Otherwise, when
- * TkpGetFontFromAttributes is called from generic code, any
- * foundry or encoding information specified in the XLFD will have
- * been parsed out and lost. But make sure we don't have an
- * "-option value" string since TkFontParseXLFD would return a
- * false success when attempting to parse it.
- */
- if (name[0] == '-') {
- if (name[1] != '*') {
- char *dash;
-
- dash = strchr(name + 1, '-');
- if ((dash == NULL) || (isspace(UCHAR(dash[-1])))) {
- return NULL;
- }
- }
- } else if (name[0] != '*') {
- return NULL;
- }
- if (TkFontParseXLFD(name, &fa.fa, &fa.xa) != TCL_OK) {
- return NULL;
- }
- fontStructPtr = CreateClosestFont(tkwin, &fa.fa, &fa.xa);
- }
- fontPtr = (UnixFont *) ckalloc(sizeof(UnixFont));
- InitFont(tkwin, fontStructPtr, fontPtr);
- return (TkFont *) fontPtr;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * TkpGetFontFromAttributes --
- *
- * Given a desired set of attributes for a font, find a font with
- * the closest matching attributes.
- *
- * Results:
- * The return value is a pointer to a TkFont that represents the
- * font with the desired attributes. If a font with the desired
- * attributes could not be constructed, some other font will be
- * substituted automatically.
- *
- * Every call to this procedure returns a new TkFont structure,
- * even if the specified attributes have already been seen before.
- * The caller should call TkpDeleteFont() to free the platform-
- * specific data when the font is no longer needed.
- *
- * The caller is responsible for initializing the memory associated
- * with the generic TkFont when this function returns and releasing
- * the contents of the generic TkFont before calling TkpDeleteFont().
- *
- * Side effects:
- * Memory allocated.
- *
- *---------------------------------------------------------------------------
- */
- TkFont *
- TkpGetFontFromAttributes(tkFontPtr, tkwin, faPtr)
- TkFont *tkFontPtr; /* If non-NULL, store the information in
- * this existing TkFont structure, rather than
- * allocating a new structure to hold the
- * font; the existing contents of the font
- * will be released. If NULL, a new TkFont
- * structure is allocated. */
- Tk_Window tkwin; /* For display where font will be used. */
- CONST TkFontAttributes *faPtr;
- /* Set of attributes to match. */
- {
- UnixFont *fontPtr;
- TkXLFDAttributes xa;
- XFontStruct *fontStructPtr;
- TkInitXLFDAttributes(&xa);
- fontStructPtr = CreateClosestFont(tkwin, faPtr, &xa);
- fontPtr = (UnixFont *) tkFontPtr;
- if (fontPtr == NULL) {
- fontPtr = (UnixFont *) ckalloc(sizeof(UnixFont));
- } else {
- ReleaseFont(fontPtr);
- }
- InitFont(tkwin, fontStructPtr, fontPtr);
- fontPtr->font.fa.underline = faPtr->underline;
- fontPtr->font.fa.overstrike = faPtr->overstrike;
- return (TkFont *) fontPtr;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * TkpDeleteFont --
- *
- * Called to release a font allocated by TkpGetNativeFont() or
- * TkpGetFontFromAttributes(). The caller should have already
- * released the fields of the TkFont that are used exclusively by
- * the generic TkFont code.
- *
- * Results:
- * None.
- *
- * Side effects:
- * TkFont is deallocated.
- *
- *---------------------------------------------------------------------------
- */
- void
- TkpDeleteFont(tkFontPtr)
- TkFont *tkFontPtr; /* Token of font to be deleted. */
- {
- UnixFont *fontPtr;
- fontPtr = (UnixFont *) tkFontPtr;
- ReleaseFont(fontPtr);
- }
- /*
- *---------------------------------------------------------------------------
- *
- * TkpGetFontFamilies --
- *
- * Return information about the font families that are available
- * on the display of the given window.
- *
- * Results:
- * Modifies interp's result object to hold a list of all the available
- * font families.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- void
- TkpGetFontFamilies(interp, tkwin)
- Tcl_Interp *interp; /* Interp to hold result. */
- Tk_Window tkwin; /* For display to query. */
- {
- int i, new, numNames;
- char *family;
- Tcl_HashTable familyTable;
- Tcl_HashEntry *hPtr;
- Tcl_HashSearch search;
- char **nameList;
- Tcl_Obj *resultPtr, *strPtr;
- resultPtr = Tcl_GetObjResult(interp);
- Tcl_InitHashTable(&familyTable, TCL_STRING_KEYS);
- nameList = ListFonts(Tk_Display(tkwin), "*", &numNames);
- for (i = 0; i < numNames; i++) {
- char *familyEnd;
- family = strchr(nameList[i] + 1, '-');
- if (family == NULL) {
- /*
- * Apparently, sometimes ListFonts() can return a font name with
- * zero or one '-' character in it. This is probably indicative of
- * a server misconfiguration, but crashing because of it is a very
- * bad idea anyway. [Bug 1475865]
- */
- continue;
- }
- family++; /* Advance to char after '-'. */
- familyEnd = strchr(family, '-');
- if (familyEnd == NULL) {
- continue; /* See comment above. */
- }
- *familyEnd = ' ';
- family = strchr(nameList[i] + 1, '-') + 1;
- Tcl_CreateHashEntry(&familyTable, family, &new);
- }
- XFreeFontNames(nameList);
- hPtr = Tcl_FirstHashEntry(&familyTable, &search);
- while (hPtr != NULL) {
- strPtr = Tcl_NewStringObj(Tcl_GetHashKey(&familyTable, hPtr), -1);
- Tcl_ListObjAppendElement(NULL, resultPtr, strPtr);
- hPtr = Tcl_NextHashEntry(&search);
- }
- Tcl_DeleteHashTable(&familyTable);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * TkpGetSubFonts --
- *
- * A function used by the testing package for querying the actual
- * screen fonts that make up a font object.
- *
- * Results:
- * Modifies interp's result object to hold a list containing the
- * names of the screen fonts that make up the given font object.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- void
- TkpGetSubFonts(interp, tkfont)
- Tcl_Interp *interp;
- Tk_Font tkfont;
- {
- int i;
- Tcl_Obj *objv[3];
- Tcl_Obj *resultPtr, *listPtr;
- UnixFont *fontPtr;
- FontFamily *familyPtr;
- resultPtr = Tcl_GetObjResult(interp);
- fontPtr = (UnixFont *) tkfont;
- for (i = 0; i < fontPtr->numSubFonts; i++) {
- familyPtr = fontPtr->subFontArray[i].familyPtr;
- objv[0] = Tcl_NewStringObj(familyPtr->faceName, -1);
- objv[1] = Tcl_NewStringObj(familyPtr->foundry, -1);
- objv[2] = Tcl_NewStringObj(Tcl_GetEncodingName(familyPtr->encoding), -1);
- listPtr = Tcl_NewListObj(3, objv);
- Tcl_ListObjAppendElement(NULL, resultPtr, listPtr);
- }
- }
- /*
- *---------------------------------------------------------------------------
- *
- * Tk_MeasureChars --
- *
- * Determine the number of characters from the string that will fit
- * in the given horizontal span. The measurement is done under the
- * assumption that Tk_DrawChars() will be used to actually display
- * the characters.
- *
- * Results:
- * The return value is the number of bytes from source that
- * fit into the span that extends from 0 to maxLength. *lengthPtr is
- * filled with the x-coordinate of the right edge of the last
- * character that did fit.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- int
- Tk_MeasureChars(tkfont, source, numBytes, maxLength, flags, lengthPtr)
- Tk_Font tkfont; /* Font in which characters will be drawn. */
- CONST char *source; /* UTF-8 string to be displayed. Need not be
- * ' ' terminated. */
- int numBytes; /* Maximum number of bytes to consider
- * from source string. */
- int maxLength; /* If >= 0, maxLength specifies the longest
- * permissible line length in pixels; don't
- * consider any character that would cross
- * this x-position. If < 0, then line length
- * is unbounded and the flags argument is
- * ignored. */
- int flags; /* Various flag bits OR-ed together:
- * TK_PARTIAL_OK means include the last char
- * which only partially fit on this line.
- * TK_WHOLE_WORDS means stop on a word
- * boundary, if possible.
- * TK_AT_LEAST_ONE means return at least one
- * character even if no characters fit. */
- int *lengthPtr; /* Filled with x-location just after the
- * terminating character. */
- {
- UnixFont *fontPtr;
- SubFont *lastSubFontPtr;
- int curX, curByte;
- /*
- * Unix does not use kerning or fractional character widths when
- * displaying text on the screen. So that means we can safely measure
- * individual characters or spans of characters and add up the widths
- * w/o any "off-by-one-pixel" errors.
- */
- fontPtr = (UnixFont *) tkfont;
- lastSubFontPtr = &fontPtr->subFontArray[0];
- if (numBytes == 0) {
- curX = 0;
- curByte = 0;
- } else if (maxLength < 0) {
- CONST char *p, *end, *next;
- Tcl_UniChar ch;
- SubFont *thisSubFontPtr;
- FontFamily *familyPtr;
- Tcl_DString runString;
- /*
- * A three step process:
- * 1. Find a contiguous range of characters that can all be
- * represented by a single screen font.
- * 2. Convert those chars to the encoding of that font.
- * 3. Measure converted chars.
- */
- curX = 0;
- end = source + numBytes;
- for (p = source; p < end; ) {
- next = p + Tcl_UtfToUniChar(p, &ch);
- thisSubFontPtr = FindSubFontForChar(fontPtr, ch, &lastSubFontPtr);
- if (thisSubFontPtr != lastSubFontPtr) {
- familyPtr = lastSubFontPtr->familyPtr;
- Tcl_UtfToExternalDString(familyPtr->encoding, source,
- p - source, &runString);
- if (familyPtr->isTwoByteFont) {
- curX += XTextWidth16(lastSubFontPtr->fontStructPtr,
- (XChar2b *) Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString) / 2);
- } else {
- curX += XTextWidth(lastSubFontPtr->fontStructPtr,
- Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString));
- }
- Tcl_DStringFree(&runString);
- lastSubFontPtr = thisSubFontPtr;
- source = p;
- }
- p = next;
- }
- familyPtr = lastSubFontPtr->familyPtr;
- Tcl_UtfToExternalDString(familyPtr->encoding, source, p - source,
- &runString);
- if (familyPtr->isTwoByteFont) {
- curX += XTextWidth16(lastSubFontPtr->fontStructPtr,
- (XChar2b *) Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString) >> 1);
- } else {
- curX += XTextWidth(lastSubFontPtr->fontStructPtr,
- Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString));
- }
- Tcl_DStringFree(&runString);
- curByte = numBytes;
- } else {
- CONST char *p, *end, *next, *term;
- int newX, termX, sawNonSpace, dstWrote;
- Tcl_UniChar ch;
- FontFamily *familyPtr;
- char buf[16];
- /*
- * How many chars will fit in the space allotted?
- * This first version may be inefficient because it measures
- * every character individually.
- */
- next = source + Tcl_UtfToUniChar(source, &ch);
- newX = curX = termX = 0;
-
- term = source;
- end = source + numBytes;
- sawNonSpace = (ch > 255) || !isspace(ch);
- familyPtr = lastSubFontPtr->familyPtr;
- for (p = source; ; ) {
- if ((ch < BASE_CHARS) && (fontPtr->widths[ch] != 0)) {
- newX += fontPtr->widths[ch];
- } else {
- lastSubFontPtr = FindSubFontForChar(fontPtr, ch, NULL);
- familyPtr = lastSubFontPtr->familyPtr;
- Tcl_UtfToExternal(NULL, familyPtr->encoding, p, next - p,
- 0, NULL, buf, sizeof(buf), NULL, &dstWrote, NULL);
- if (familyPtr->isTwoByteFont) {
- newX += XTextWidth16(lastSubFontPtr->fontStructPtr,
- (XChar2b *) buf, dstWrote >> 1);
- } else {
- newX += XTextWidth(lastSubFontPtr->fontStructPtr, buf,
- dstWrote);
- }
- }
- if (newX > maxLength) {
- break;
- }
- curX = newX;
- p = next;
- if (p >= end) {
- term = end;
- termX = curX;
- break;
- }
- next += Tcl_UtfToUniChar(next, &ch);
- if ((ch < 256) && isspace(ch)) {
- if (sawNonSpace) {
- term = p;
- termX = curX;
- sawNonSpace = 0;
- }
- } else {
- sawNonSpace = 1;
- }
- }
- /*
- * P points to the first character that doesn't fit in the desired
- * span. Use the flags to figure out what to return.
- */
- if ((flags & TK_PARTIAL_OK) && (p < end) && (curX < maxLength)) {
- /*
- * Include the first character that didn't quite fit in the desired
- * span. The width returned will include the width of that extra
- * character.
- */
- curX = newX;
- p += Tcl_UtfToUniChar(p, &ch);
- }
- if ((flags & TK_AT_LEAST_ONE) && (term == source) && (p < end)) {
- term = p;
- termX = curX;
- if (term == source) {
- term += Tcl_UtfToUniChar(term, &ch);
- termX = newX;
- }
- } else if ((p >= end) || !(flags & TK_WHOLE_WORDS)) {
- term = p;
- termX = curX;
- }
- curX = termX;
- curByte = term - source;
- }
- *lengthPtr = curX;
- return curByte;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * Tk_DrawChars --
- *
- * Draw a string of characters on the screen. Tk_DrawChars()
- * expands control characters that occur in the string to
- * xNN sequences.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Information gets drawn on the screen.
- *
- *---------------------------------------------------------------------------
- */
- void
- Tk_DrawChars(display, drawable, gc, tkfont, source, numBytes, x, y)
- Display *display; /* Display on which to draw. */
- Drawable drawable; /* Window or pixmap in which to draw. */
- GC gc; /* Graphics context for drawing characters. */
- Tk_Font tkfont; /* Font in which characters will be drawn;
- * must be the same as font used in GC. */
- CONST char *source; /* UTF-8 string to be displayed. Need not be
- * ' ' terminated. All Tk meta-characters
- * (tabs, control characters, and newlines)
- * should be stripped out of the string that
- * is passed to this function. If they are
- * not stripped out, they will be displayed as
- * regular printing characters. */
- int numBytes; /* Number of bytes in string. */
- int x, y; /* Coordinates at which to place origin of
- * string when drawing. */
- {
- UnixFont *fontPtr;
- SubFont *thisSubFontPtr, *lastSubFontPtr;
- Tcl_DString runString;
- CONST char *p, *end, *next;
- int xStart, needWidth, window_width, do_width;
- Tcl_UniChar ch;
- FontFamily *familyPtr;
- #ifdef TK_DRAW_CHAR_XWINDOW_CHECK
- int rx, ry;
- unsigned int width, height, border_width, depth;
- Drawable root;
- #endif
- fontPtr = (UnixFont *) tkfont;
- lastSubFontPtr = &fontPtr->subFontArray[0];
- xStart = x;
- #ifdef TK_DRAW_CHAR_XWINDOW_CHECK
- /*
- * Get the window width so we can abort drawing outside of the window
- */
- if (XGetGeometry(display, drawable, &root, &rx, &ry, &width, &height,
- &border_width, &depth) == False) {
- window_width = INT_MAX;
- } else {
- window_width = width;
- }
- #else
- /*
- * This is used by default until we find a solution that doesn't
- * round-trip to the X server (need to get Tk cached window width).
- */
- window_width = 32768;
- #endif
- end = source + numBytes;
- needWidth = fontPtr->font.fa.underline + fontPtr->font.fa.overstrike;
- for (p = source; p <= end; ) {
- if (p < end) {
- next = p + Tcl_UtfToUniChar(p, &ch);
- thisSubFontPtr = FindSubFontForChar(fontPtr, ch, &lastSubFontPtr);
- } else {
- next = p + 1;
- thisSubFontPtr = lastSubFontPtr;
- }
- if ((thisSubFontPtr != lastSubFontPtr)
- || (p == end) || (p-source > 200)) {
- if (p > source) {
- do_width = (needWidth || (p != end)) ? 1 : 0;
- familyPtr = lastSubFontPtr->familyPtr;
- Tcl_UtfToExternalDString(familyPtr->encoding, source,
- p - source, &runString);
- if (familyPtr->isTwoByteFont) {
- XDrawString16(display, drawable, gc, x, y,
- (XChar2b *) Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString) / 2);
- if (do_width) {
- x += XTextWidth16(lastSubFontPtr->fontStructPtr,
- (XChar2b *) Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString) / 2);
- }
- } else {
- XDrawString(display, drawable, gc, x, y,
- Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString));
- if (do_width) {
- x += XTextWidth(lastSubFontPtr->fontStructPtr,
- Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString));
- }
- }
- Tcl_DStringFree(&runString);
- }
- lastSubFontPtr = thisSubFontPtr;
- source = p;
- XSetFont(display, gc, lastSubFontPtr->fontStructPtr->fid);
- if (x > window_width) {
- break;
- }
- }
- p = next;
- }
- if (lastSubFontPtr != &fontPtr->subFontArray[0]) {
- XSetFont(display, gc, fontPtr->subFontArray[0].fontStructPtr->fid);
- }
- if (fontPtr->font.fa.underline != 0) {
- XFillRectangle(display, drawable, gc, xStart,
- y + fontPtr->underlinePos,
- (unsigned) (x - xStart), (unsigned) fontPtr->barHeight);
- }
- if (fontPtr->font.fa.overstrike != 0) {
- y -= fontPtr->font.fm.descent + (fontPtr->font.fm.ascent) / 10;
- XFillRectangle(display, drawable, gc, xStart, y,
- (unsigned) (x - xStart), (unsigned) fontPtr->barHeight);
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * CreateClosestFont --
- *
- * Helper for TkpGetNativeFont() and TkpGetFontFromAttributes().
- * Given a set of font attributes, construct a close XFontStruct.
- * If requested face name is not available, automatically
- * substitutes an alias for requested face name. If encoding is
- * not specified (or the requested one is not available),
- * automatically chooses another encoding from the list of
- * preferred encodings. If the foundry is not specified (or
- * is not available) automatically prefers "adobe" foundry.
- * For all other attributes, if the requested value was not
- * available, the appropriate "close" value will be used.
- *
- * Results:
- * Return value is the XFontStruct that best matched the
- * requested attributes. The return value is never NULL; some
- * font will always be returned.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- static XFontStruct *
- CreateClosestFont(tkwin, faPtr, xaPtr)
- Tk_Window tkwin; /* For display where font will be used. */
- CONST TkFontAttributes *faPtr;
- /* Set of generic attributes to match. */
- CONST TkXLFDAttributes *xaPtr;
- /* Set of X-specific attributes to match. */
- {
- FontAttributes want;
- char **nameList;
- int numNames, nameIdx;
- Display *display;
- XFontStruct *fontStructPtr;
- int bestIdx[2];
- unsigned int bestScore[2];
- want.fa = *faPtr;
- want.xa = *xaPtr;
- if (want.xa.foundry == NULL) {
- want.xa.foundry = Tk_GetUid("adobe");
- }
- if (want.fa.family == NULL) {
- want.fa.family = Tk_GetUid("fixed");
- }
- want.fa.size = -TkFontGetPixels(tkwin, faPtr->size);
- if (want.xa.charset == NULL || *want.xa.charset == ' ') {
- want.xa.charset = Tk_GetUid("iso8859-1"); /* locale. */
- }
- display = Tk_Display(tkwin);
- /*
- * Algorithm to get the closest font to the name requested.
- *
- * try fontname
- * try all aliases for fontname
- * foreach fallback for fontname
- * try the fallback
- * try all aliases for the fallback
- */
- nameList = ListFontOrAlias(display, want.fa.family, &numNames);
- if (numNames == 0) {
- char ***fontFallbacks;
- int i, j;
- char *fallback;
-
- fontFallbacks = TkFontGetFallbacks();
- for (i = 0; fontFallbacks[i] != NULL; i++) {
- for (j = 0; (fallback = fontFallbacks[i][j]) != NULL; j++) {
- if (strcasecmp(want.fa.family, fallback) == 0) {
- break;
- }
- }
- if (fallback != NULL) {
- for (j = 0; (fallback = fontFallbacks[i][j]) != NULL; j++) {
- nameList = ListFontOrAlias(display, fallback, &numNames);
- if (numNames != 0) {
- goto found;
- }
- }
- }
- }
- nameList = ListFonts(display, "fixed", &numNames);
- if (numNames == 0) {
- nameList = ListFonts(display, "*", &numNames);
- }
- if (numNames == 0) {
- return GetSystemFont(display);
- }
- }
- found:
- bestIdx[0] = -1;
- bestIdx[1] = -1;
- bestScore[0] = (unsigned int) -1;
- bestScore[1] = (unsigned int) -1;
- for (nameIdx = 0; nameIdx < numNames; nameIdx++) {
- FontAttributes got;
- int scalable;
- unsigned int score;
- if (TkFontParseXLFD(nameList[nameIdx], &got.fa, &got.xa) != TCL_OK) {
- continue;
- }
- IdentifySymbolEncodings(&got);
- scalable = (got.fa.size == 0);
- score = RankAttributes(&want, &got);
- if (score < bestScore[scalable]) {
- bestIdx[scalable] = nameIdx;
- bestScore[scalable] = score;
- }
- if (score == 0) {
- break;
- }
- }
- fontStructPtr = GetScreenFont(display, &want, nameList, bestIdx, bestScore);
- XFreeFontNames(nameList);
-
- if (fontStructPtr == NULL) {
- return GetSystemFont(display);
- }
- return fontStructPtr;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * InitFont --
- *
- * Helper for TkpGetNativeFont() and TkpGetFontFromAttributes().
- * Initializes the memory for a new UnixFont that wraps the
- * platform-specific data.
- *
- * The caller is responsible for initializing the fields of the
- * TkFont that are used exclusively by the generic TkFont code, and
- * for releasing those fields before calling TkpDeleteFont().
- *
- * Results:
- * Fills the WinFont structure.
- *
- * Side effects:
- * Memory allocated.
- *
- *---------------------------------------------------------------------------
- */
- static void
- InitFont(tkwin, fontStructPtr, fontPtr)
- Tk_Window tkwin; /* For screen where font will be used. */
- XFontStruct *fontStructPtr; /* X information about font. */
- UnixFont *fontPtr; /* Filled with information constructed from
- * the above arguments. */
- {
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- unsigned long value;
- int minHi, maxHi, minLo, maxLo, fixed, width, limit, i, n;
- FontAttributes fa;
- TkFontAttributes *faPtr;
- TkFontMetrics *fmPtr;
- SubFont *controlPtr, *subFontPtr;
- char *pageMap;
- Display *display;
- /*
- * Get all font attributes and metrics.
- */
-
- display = Tk_Display(tkwin);
- GetFontAttributes(display, fontStructPtr, &fa);
- minHi = fontStructPtr->min_byte1;
- maxHi = fontStructPtr->max_byte1;
- minLo = fontStructPtr->min_char_or_byte2;
- maxLo = fontStructPtr->max_char_or_byte2;
-
- fixed = 1;
- if (fontStructPtr->per_char != NULL) {
- width = 0;
- limit = (maxHi - minHi + 1) * (maxLo - minLo + 1);
- for (i = 0; i < limit; i++) {
- n = fontStructPtr->per_char[i].width;
- if (n != 0) {
- if (width == 0) {
- width = n;
- } else if (width != n) {
- fixed = 0;
- break;
- }
- }
- }
- }
- fontPtr->font.fid = fontStructPtr->fid;
- faPtr = &fontPtr->font.fa;
- faPtr->family = fa.fa.family;
- faPtr->size = TkFontGetPoints(tkwin, fa.fa.size);
- faPtr->weight = fa.fa.weight;
- faPtr->slant = fa.fa.slant;
- faPtr->underline = 0;
- faPtr->overstrike = 0;
- fmPtr = &fontPtr->font.fm;
- fmPtr->ascent = fontStructPtr->ascent;
- fmPtr->descent = fontStructPtr->descent;
- fmPtr->maxWidth = fontStructPtr->max_bounds.width;
- fmPtr->fixed = fixed;
- fontPtr->display = display;
- fontPtr->pixelSize = TkFontGetPixels(tkwin, fa.fa.size);
- fontPtr->xa = fa.xa;
- fontPtr->numSubFonts = 1;
- fontPtr->subFontArray = fontPtr->staticSubFonts;
- InitSubFont(display, fontStructPtr, 1, &fontPtr->subFontArray[0]);
- fontPtr->controlSubFont = fontPtr->subFontArray[0];
- subFontPtr = FindSubFontForChar(fontPtr, '0', NULL);
- controlPtr = &fontPtr->controlSubFont;
- controlPtr->fontStructPtr = subFontPtr->fontStructPtr;
- controlPtr->familyPtr = &tsdPtr->controlFamily;
- controlPtr->fontMap = tsdPtr->controlFamily.fontMap;
-
- pageMap = fontPtr->subFontArray[0].fontMap[0];
- for (i = 0; i < 256; i++) {
- if ((minHi > 0) || (i < minLo) || (i > maxLo) ||
- (((pageMap[i >> 3] >> (i & 7)) & 1) == 0)) {
- n = 0;
- } else if (fontStructPtr->per_char == NULL) {
- n = fontStructPtr->max_bounds.width;
- } else {
- n = fontStructPtr->per_char[i - minLo].width;
- }
- fontPtr->widths[i] = n;
- }
-
- if (XGetFontProperty(fontStructPtr, XA_UNDERLINE_POSITION, &value)) {
- fontPtr->underlinePos = value;
- } else {
- /*
- * If the XA_UNDERLINE_POSITION property does not exist, the X
- * manual recommends using the following value:
- */
- fontPtr->underlinePos = fontStructPtr->descent / 2;
- }
- fontPtr->barHeight = 0;
- if (XGetFontProperty(fontStructPtr, XA_UNDERLINE_THICKNESS, &value)) {
- fontPtr->barHeight = value;
- }
- if (fontPtr->barHeight == 0) {
- /*
- * If the XA_UNDERLINE_THICKNESS property does not exist, the X
- * manual recommends using the width of the stem on a capital
- * letter. I don't know of a way to get the stem width of a letter,
- * so guess and use 1/3 the width of a capital I.
- */
- fontPtr->barHeight = fontPtr->widths['I'] / 3;
- if (fontPtr->barHeight == 0) {
- fontPtr->barHeight = 1;
- }
- }
- if (fontPtr->underlinePos + fontPtr->barHeight > fontStructPtr->descent) {
- /*
- * If this set of cobbled together values would cause the bottom of
- * the underline bar to stick below the descent of the font, jack
- * the underline up a bit higher.
- */
- fontPtr->barHeight = fontStructPtr->descent - fontPtr->underlinePos;
- if (fontPtr->barHeight == 0) {
- fontPtr->underlinePos--;
- fontPtr->barHeight = 1;
- }
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * ReleaseFont --
- *
- * Called to release the unix-specific contents of a TkFont.
- * The caller is responsible for freeing the memory used by the
- * font itself.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Memory is freed.
- *
- *---------------------------------------------------------------------------
- */
-
- static void
- ReleaseFont(fontPtr)
- UnixFont *fontPtr; /* The font to delete. */
- {
- int i;
- for (i = 0; i < fontPtr->numSubFonts; i++) {
- ReleaseSubFont(fontPtr->display, &fontPtr->subFontArray[i]);
- }
- if (fontPtr->subFontArray != fontPtr->staticSubFonts) {
- ckfree((char *) fontPtr->subFontArray);
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * InitSubFont --
- *
- * Wrap a screen font and load the FontFamily that represents
- * it. Used to prepare a SubFont so that characters can be mapped
- * from UTF-8 to the charset of the font.
- *
- * Results:
- * The subFontPtr is filled with information about the font.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- static void
- InitSubFont(display, fontStructPtr, base, subFontPtr)
- Display *display; /* Display in which font will be used. */
- XFontStruct *fontStructPtr; /* The screen font. */
- int base; /* Non-zero if this SubFont is being used
- * as the base font for a font object. */
- SubFont *subFontPtr; /* Filled with SubFont constructed from
- * above attributes. */
- {
- subFontPtr->fontStructPtr = fontStructPtr;
- subFontPtr->familyPtr = AllocFontFamily(display, fontStructPtr, base);
- subFontPtr->fontMap = subFontPtr->familyPtr->fontMap;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * ReleaseSubFont --
- *
- * Called to release the contents of a SubFont. The caller is
- * responsible for freeing the memory used by the SubFont itself.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Memory and resources are freed.
- *
- *---------------------------------------------------------------------------
- */
- static void
- ReleaseSubFont(display, subFontPtr)
- Display *display; /* Display which owns screen font. */
- SubFont *subFontPtr; /* The SubFont to delete. */
- {
- XFreeFont(display, subFontPtr->fontStructPtr);
- FreeFontFamily(subFontPtr->familyPtr);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * AllocFontFamily --
- *
- * Find the FontFamily structure associated with the given font
- * name. The information should be stored by the caller in a
- * SubFont and used when determining if that SubFont supports a
- * character.
- *
- * Cannot use the string name used to construct the font as the
- * key, because the capitalization may not be canonical. Therefore
- * use the face name actually retrieved from the font metrics as
- * the key.
- *
- * Results:
- * A pointer to a FontFamily. The reference count in the FontFamily
- * is automatically incremented. When the SubFont is released, the
- * reference count is decremented. When no SubFont is using this
- * FontFamily, it may be deleted.
- *
- * Side effects:
- * A new FontFamily structure will be allocated if this font family
- * has not been seen. TrueType character existence metrics are
- * loaded into the FontFamily structure.
- *
- *-------------------------------------------------------------------------
- */
- static FontFamily *
- AllocFontFamily(display, fontStructPtr, base)
- Display *display; /* Display in which font will be used. */
- XFontStruct *fontStructPtr; /* Screen font whose FontFamily is to be
- * returned. */
- int base; /* Non-zero if this font family is to be
- * used in the base font of a font object. */
- {
- FontFamily *familyPtr;
- FontAttributes fa;
- Tcl_Encoding encoding;
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- GetFontAttributes(display, fontStructPtr, &fa);
- encoding = Tcl_GetEncoding(NULL, GetEncodingAlias(fa.xa.charset));
- familyPtr = tsdPtr->fontFamilyList;
- for (; familyPtr != NULL; familyPtr = familyPtr->nextPtr) {
- if ((familyPtr->faceName == fa.fa.family)
- && (familyPtr->foundry == fa.xa.foundry)
- && (familyPtr->encoding == encoding)) {
- Tcl_FreeEncoding(encoding);
- familyPtr->refCount++;
- return familyPtr;
- }
- }
- familyPtr = (FontFamily *) ckalloc(sizeof(FontFamily));
- memset(familyPtr, 0, sizeof(FontFamily));
- familyPtr->nextPtr = tsdPtr->fontFamilyList;
- tsdPtr->fontFamilyList = familyPtr;
- /*
- * Set key for this FontFamily.
- */
-
- familyPtr->foundry = fa.xa.foundry;
- familyPtr->faceName = fa.fa.family;
- familyPtr->encoding = encoding;
- /*
- * An initial refCount of 2 means that FontFamily information will
- * persist even when the SubFont that loaded the FontFamily is released.
- * Change it to 1 to cause FontFamilies to be unloaded when not in use.
- */
- familyPtr->refCount = 2;
- /*
- * One byte/character fonts have both min_byte1 and max_byte1 0,
- * and max_char_or_byte2 <= 255.
- * Anything else specifies a two byte/character font.
- */
- familyPtr->isTwoByteFont = !(
- (fontStructPtr->min_byte1 == 0) &&
- (fontStructPtr->max_byte1 == 0) &&
- (fontStructPtr->max_char_or_byte2 < 256));
- return familyPtr;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FreeFontFamily --
- *
- * Called to free an FontFamily when the SubFont is finished using
- * it. Frees the contents of the FontFamily and the memory used by
- * the FontFamily itself.
- *
- * Results:
- * None.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
-
- static void
- FreeFontFamily(familyPtr)
- FontFamily *familyPtr; /* The FontFamily to delete. */
- {
- FontFamily **familyPtrPtr;
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- int i;
- if (familyPtr == NULL) {
- return;
- }
- familyPtr->refCount--;
- if (familyPtr->refCount > 0) {
- return;
- }
- Tcl_FreeEncoding(familyPtr->encoding);
- for (i = 0; i < FONTMAP_PAGES; i++) {
- if (familyPtr->fontMap[i] != NULL) {
- ckfree(familyPtr->fontMap[i]);
- }
- }
-
- /*
- * Delete from list.
- */
-
- for (familyPtrPtr = &tsdPtr->fontFamilyList; ; ) {
- if (*familyPtrPtr == familyPtr) {
- *familyPtrPtr = familyPtr->nextPtr;
- break;
- }
- familyPtrPtr = &(*familyPtrPtr)->nextPtr;
- }
-
- ckfree((char *) familyPtr);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FindSubFontForChar --
- *
- * Determine which screen font is necessary to use to
- * display the given character. If the font object does not have
- * a screen font that can display the character, another screen font
- * may be loaded into the font object, following a set of preferred
- * fallback rules.
- *
- * Results:
- * The return value is the SubFont to use to display the given
- * character.
- *
- * Side effects:
- * The contents of fontPtr are modified to cache the results
- * of the lookup and remember any SubFonts that were dynamically
- * loaded. The table of SubFonts might be extended, and if a non-NULL
- * reference to a subfont pointer is available, it is updated if it
- * previously pointed into the old subfont table.
- *
- *-------------------------------------------------------------------------
- */
- static SubFont *
- FindSubFontForChar(fontPtr, ch, fixSubFontPtrPtr)
- UnixFont *fontPtr; /* The font object with which the character
- * will be displayed. */
- int ch; /* The Unicode character to be displayed. */
- SubFont **fixSubFontPtrPtr; /* Subfont reference to fix up if we
- * reallocate our subfont table. */
- {
- int i, j, k, numNames;
- Tk_Uid faceName;
- char *fallback;
- char **aliases, **nameList, **anyFallbacks;
- char ***fontFallbacks;
- SubFont *subFontPtr;
- Tcl_DString ds;
- if (FontMapLookup(&fontPtr->subFontArray[0], ch)) {
- return &fontPtr->subFontArray[0];
- }
- for (i = 1; i < fontPtr->numSubFonts; i++) {
- if (FontMapLookup(&fontPtr->subFontArray[i], ch)) {
- return &fontPtr->subFontArray[i];
- }
- }
- if (FontMapLookup(&fontPtr->controlSubFont, ch)) {
- return &fontPtr->controlSubFont;
- }
- /*
- * Keep track of all face names that we check, so we don't check some
- * name multiple times if it can be reached by multiple paths.
- */
-
- Tcl_DStringInit(&ds);
- /*
- * Are there any other fonts with the same face name as the base
- * font that could display this character, e.g., if the base font
- * is adobe:fixed:iso8859-1, we could might be able to use
- * misc:fixed:iso8859-8 or sony:fixed:jisx0208.1983-0
- */
-
- faceName = fontPtr->font.fa.family;
- if (SeenName(faceName, &ds) == 0) {
- subFontPtr = CanUseFallback(fontPtr, faceName, ch, fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- goto end;
- }
- }
- aliases = TkFontGetAliasList(faceName);
- subFontPtr = NULL;
- fontFallbacks = TkFontGetFallbacks();
- for (i = 0; fontFallbacks[i] != NULL; i++) {
- for (j = 0; (fallback = fontFallbacks[i][j]) != NULL; j++) {
- if (strcasecmp(fallback, faceName) == 0) {
- /*
- * If the base font has a fallback...
- */
- goto tryfallbacks;
- } else if (aliases != NULL) {
- /*
- * Or if an alias for the base font has a fallback...
- */
- for (k = 0; aliases[k] != NULL; k++) {
- if (strcasecmp(fallback, aliases[k]) == 0) {
- goto tryfallbacks;
- }
- }
- }
- }
- continue;
- tryfallbacks:
- /*
- * ...then see if we can use one of the fallbacks, or an
- * alias for one of the fallbacks.
- */
- for (j = 0; (fallback = fontFallbacks[i][j]) != NULL; j++) {
- subFontPtr = CanUseFallbackWithAliases(fontPtr, fallback, ch, &ds,
- fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- goto end;
- }
- }
- }
- /*
- * See if we can use something from the global fallback list.
- */
- anyFallbacks = TkFontGetGlobalClass();
- for (i = 0; (fallback = anyFallbacks[i]) != NULL; i++) {
- subFontPtr = CanUseFallbackWithAliases(fontPtr, fallback, ch, &ds,
- fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- goto end;
- }
- }
- /*
- * Try all face names available in the whole system until we
- * find one that can be used.
- */
- nameList = ListFonts(fontPtr->display, "*", &numNames);
- for (i = 0; i < numNames; i++) {
- fallback = strchr(nameList[i] + 1, '-') + 1;
- strchr(fallback, '-')[0] = ' ';
- if (SeenName(fallback, &ds) == 0) {
- subFontPtr = CanUseFallback(fontPtr, fallback, ch,
- fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- XFreeFontNames(nameList);
- goto end;
- }
- }
- }
- XFreeFontNames(nameList);
- end:
- Tcl_DStringFree(&ds);
- if (subFontPtr == NULL) {
- /*
- * No font can display this character, so it will be displayed as a
- * control character expansion.
- */
- subFontPtr = &fontPtr->controlSubFont;
- FontMapInsert(subFontPtr, ch);
- }
- return subFontPtr;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FontMapLookup --
- *
- * See if the screen font can display the given character.
- *
- * Results:
- * The return value is 0 if the screen font cannot display the
- * character, non-zero otherwise.
- *
- * Side effects:
- * New pages are added to the font mapping cache whenever the
- * character belongs to a page that hasn't been seen before.
- * When a page is loaded, information about all the characters on
- * that page is stored, not just for the single character in
- * question.
- *
- *-------------------------------------------------------------------------
- */
- static int
- FontMapLookup(subFontPtr, ch)
- SubFont *subFontPtr; /* Contains font mapping cache to be queried
- * and possibly updated. */
- int ch; /* Character to be tested. */
- {
- int row, bitOffset;
- row = ch >> FONTMAP_SHIFT;
- if (subFontPtr->fontMap[row] == NULL) {
- FontMapLoadPage(subFontPtr, row);
- }
- bitOffset = ch & (FONTMAP_BITSPERPAGE - 1);
- return (subFontPtr->fontMap[row][bitOffset >> 3] >> (bitOffset & 7)) & 1;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FontMapInsert --
- *
- * Tell the font mapping cache that the given screen font should be
- * used to display the specified character. This is called when no
- * font on the system can be be found that can display that
- * character; we lie to the font and tell it that it can display
- * the character, otherwise we would end up re-searching the entire
- * fallback hierarchy every time that character was seen.
- *
- * Results:
- * None.
- *
- * Side effects:
- * New pages are added to the font mapping cache whenever the
- * character belongs to a page that hasn't been seen before.
- * When a page is loaded, information about all the characters on
- * that page is stored, not just for the single character in
- * question.
- *
- *-------------------------------------------------------------------------
- */
- static void
- FontMapInsert(subFontPtr, ch)
- SubFont *subFontPtr; /* Contains font mapping cache to be
- * updated. */
- int ch; /* Character to be added to cache. */
- {
- int row, bitOffset;
- row = ch >> FONTMAP_SHIFT;
- if (subFontPtr->fontMap[row] == NULL) {
- FontMapLoadPage(subFontPtr, row);
- }
- bitOffset = ch & (FONTMAP_BITSPERPAGE - 1);
- subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FontMapLoadPage --
- *
- * Load information about all the characters on a given page.
- * This information consists of one bit per character that indicates
- * whether the associated screen font can (1) or cannot (0) display
- * the characters on the page.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Mempry allocated.
- *
- *-------------------------------------------------------------------------
- */
- static void
- FontMapLoadPage(subFontPtr, row)
- SubFont *subFontPtr; /* Contains font mapping cache to be
- * updated. */
- int row; /* Index of the page to be loaded into
- * the cache. */
- {
- char buf[16], src[TCL_UTF_MAX];
- int minHi, maxHi, minLo, maxLo, scale, checkLo;
- int i, end, bitOffset, isTwoByteFont, n;
- Tcl_Encoding encoding;
- XFontStruct *fontStructPtr;
- XCharStruct *widths;
- ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
- Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
- subFontPtr->fontMap[row] = (char *) ckalloc(FONTMAP_BITSPERPAGE / 8);
- memset(subFontPtr->fontMap[row], 0, FONTMAP_BITSPERPAGE / 8);
- if (subFontPtr->familyPtr == &tsdPtr->controlFamily) {
- return;
- }
- fontStructPtr = subFontPtr->fontStructPtr;
- encoding = subFontPtr->familyPtr->encoding;
- isTwoByteFont = subFontPtr->familyPtr->isTwoByteFont;
- widths = fontStructPtr->per_char;
- minHi = fontStructPtr->min_byte1;
- maxHi = fontStructPtr->max_byte1;
- minLo = fontStructPtr->min_char_or_byte2;
- maxLo = fontStructPtr->max_char_or_byte2;
- scale = maxLo - minLo + 1;
- checkLo = minLo;
- if (! isTwoByteFont) {
- if (minLo < 32) {
- checkLo = 32;
- }
- }
- end = (row + 1) << FONTMAP_SHIFT;
- for (i = row << FONTMAP_SHIFT; i < end; i++) {
- int hi, lo;
- if (Tcl_UtfToExternal(NULL, encoding, src, Tcl_UniCharToUtf(i, src),
- TCL_ENCODING_STOPONERROR, NULL, buf, sizeof(buf), NULL,
- NULL, NULL) != TCL_OK) {
- continue;
- }
- if (isTwoByteFont) {
- hi = ((unsigned char *) buf)[0];
- lo = ((unsigned char *) buf)[1];
- } else {
- hi = 0;
- lo = ((unsigned char *) buf)[0];
- }
- if ((hi < minHi) || (hi > maxHi) || (lo < checkLo) || (lo > maxLo)) {
- continue;
- }
- n = (hi - minHi) * scale + lo - minLo;
- if ((widths == NULL) || ((widths[n].width + widths[n].rbearing) != 0)) {
- bitOffset = i & (FONTMAP_BITSPERPAGE - 1);
- subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7);
- }
- }
- }
- /*
- *---------------------------------------------------------------------------
- *
- * CanUseFallbackWithAliases --
- *
- * Helper function for FindSubFontForChar. Determine if the
- * specified face name (or an alias of the specified face name)
- * can be used to construct a screen font that can display the
- * given character.
- *
- * Results:
- * See CanUseFallback().
- *
- * Side effects:
- * If the name and/or one of its aliases was rejected, the
- * rejected string is recorded in nameTriedPtr so that it won't
- * be tried again. The table of SubFonts might be extended, and if
- * a non-NULL reference to a subfont pointer is available, it is
- * updated if it previously pointed into the old subfont table.
- *
- *---------------------------------------------------------------------------
- */
- static SubFont *
- CanUseFallbackWithAliases(fontPtr, faceName, ch, nameTriedPtr,
- fixSubFontPtrPtr)
- UnixFont *fontPtr; /* The font object that will own the new
- * screen font. */
- char *faceName; /* Desired face name for new screen font. */
- int ch; /* The Unicode character that the new
- * screen font must be able to display. */
- Tcl_DString *nameTriedPtr; /* Records face names that have already
- * been tried. It is possible for the same
- * face name to be queried multiple times when
- * trying to find a suitable screen font. */
- SubFont **fixSubFontPtrPtr; /* Subfont reference to fix up if we
- * reallocate our subfont table. */
- {
- SubFont *subFontPtr;
- char **aliases;
- int i;
-
- if (SeenName(faceName, nameTriedPtr) == 0) {
- subFontPtr = CanUseFallback(fontPtr, faceName, ch, fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- return subFontPtr;
- }
- }
- aliases = TkFontGetAliasList(faceName);
- if (aliases != NULL) {
- for (i = 0; aliases[i] != NULL; i++) {
- if (SeenName(aliases[i], nameTriedPtr) == 0) {
- subFontPtr = CanUseFallback(fontPtr, aliases[i], ch,
- fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- return subFontPtr;
- }
- }
- }
- }
- return NULL;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * SeenName --
- *
- * Used to determine we have already tried and rejected the given
- * face name when looking for a screen font that can support some
- * Unicode character.
- *
- * Results:
- * The return value is 0 if this face name has not already been seen,
- * non-zero otherwise.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static int
- SeenName(name, dsPtr)
- CONST char *name; /* The name to check. */
- Tcl_DString *dsPtr; /* Contains names that have already been
- * seen. */
- {
- CONST char *seen, *end;
- seen = Tcl_DStringValue(dsPtr);
- end = seen + Tcl_DStringLength(dsPtr);
- while (seen < end) {
- if (strcasecmp(seen, name) == 0) {
- return 1;
- }
- seen += strlen(seen) + 1;
- }
- Tcl_DStringAppend(dsPtr, (char *) name, (int) (strlen(name) + 1));
- return 0;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * CanUseFallback --
- *
- * If the specified screen font has not already been loaded
- * into the font object, determine if the specified screen
- * font can display the given character.
- *
- * Results:
- * The return value is a pointer to a newly allocated SubFont,
- * owned by the font object. This SubFont can be used to display
- * the given character. The SubFont represents the screen font
- * with the base set of font attributes from the font object, but
- * using the specified face name. NULL is returned if the font
- * object already holds a reference to the specified font or if
- * the specified font doesn't exist or cannot display the given
- * character.
- *
- * Side effects:
- * The font object's subFontArray is updated to contain a reference
- * to the newly allocated SubFont. The table of SubFonts might be
- * extended, and if a non-NULL reference to a subfont pointer is
- * available, it is updated if it previously pointed into the old
- * subfont table.
- *
- *-------------------------------------------------------------------------
- */
- static SubFont *
- CanUseFallback(fontPtr, faceName, ch, fixSubFontPtrPtr)
- UnixFont *fontPtr; /* The font object that will own the new
- * screen font. */
- CONST char *faceName; /* Desired face name for new screen font. */
- int ch; /* The Unicode character that the new
- * screen font must be able to display. */
- SubFont **fixSubFontPtrPtr; /* Subfont reference to fix up if we
- * reallocate our subfont table. */
- {
- int i, nameIdx, numNames, srcLen;
- Tk_Uid hateFoundry;
- int bestIdx[2];
- CONST char *charset, *hateCharset;
- unsigned int bestScore[2];
- char **nameList, **nameListOrig;
- FontAttributes want, got;
- char src[TCL_UTF_MAX];
- Display *display;
- SubFont subFont;
- XFontStruct *fontStructPtr;
- Tcl_DString dsEncodings;
- int numEncodings;
- Tcl_Encoding *encodingCachePtr;
- /*
- * Assume: the face name is times.
- * Assume: adobe:times:iso8859-1 has already been used.
- *
- * Are there any versions of times that can display this
- * character (e.g., perhaps linotype:times:iso8859-2)?
- * a. Get list of all times fonts.
- * b1. Cross out all names whose encodings we've already used.
- * b2. Cross out all names whose foundry & encoding we've already seen.
- * c. Cross out all names whose encoding cannot handle the character.
- * d. Rank each name and pick the best match.
- * e. If that font cannot actually display the character, cross
- * out all names with the same foundry and encoding and go
- * back to (c).
- */
- display = fontPtr->display;
- nameList = ListFonts(display, faceName, &numNames);
- if (numNames == 0) {
- return NULL;
- }
- nameListOrig = nameList;
- srcLen = Tcl_UniCharToUtf(ch, src);
- want.fa = fontPtr->font.fa;
- want.xa = fontPtr->xa;
- want.fa.family = Tk_GetUid(faceName);
- want.fa.size = -fontPtr->pixelSize;
- hateFoundry = NULL;
- hateCharset = NULL;
- numEncodings = 0;
- Tcl_DStringInit(&dsEncodings);
- charset = NULL; /* lint, since numNames must be > 0 to get here. */
- retry:
- bestIdx[0] = -1;
- bestIdx[1] = -1;
- bestScore[0] = (unsigned int) -1;
- bestScore[1] = (unsigned int) -1;
- for (nameIdx = 0; nameIdx < numNames; nameIdx++) {
- Tcl_Encoding encoding;
- char dst[16];
- int scalable, srcRead, dstWrote;
- unsigned int score;
-
- if (nameList[nameIdx] == NULL) {
- continue;
- }
- if (TkFontParseXLFD(nameList[nameIdx], &got.fa, &got.xa) != TCL_OK) {
- goto crossout;
- }
- IdentifySymbolEncodings(&got);
- charset = GetEncodingAlias(got.xa.charset);
- if (hateFoundry != NULL) {
- /*
- * E. If the font we picked cannot actually display the
- * character, cross out all names with the same foundry and
- * encoding.
- */
- if ((hateFoundry == got.xa.foundry)
- && (strcmp(hateCharset, charset) == 0)) {
- goto crossout;
- }
- } else {
- /*
- * B. Cross out all names whose encodings we've already used.
- */
-
- for (i = 0; i < fontPtr->numSubFonts; i++) {
- encoding = fontPtr->subFontArray[i].familyPtr->encoding;
- if (strcmp(charset, Tcl_GetEncodingName(encoding)) == 0) {
- goto crossout;
- }
- }
- }
-
- /*
- * C. Cross out all names whose encoding cannot handle the character.
- */
-
- encodingCachePtr = (Tcl_Encoding *) Tcl_DStringValue(&dsEncodings);
- for (i = numEncodings; --i >= 0; encodingCachePtr++) {
- encoding = *encodingCachePtr;
- if (strcmp(Tcl_GetEncodingName(encoding), charset) == 0) {
- break;
- }
- }
- if (i < 0) {
- encoding = Tcl_GetEncoding(NULL, charset);
- if (encoding == NULL) {
- goto crossout;
- }
- Tcl_DStringAppend(&dsEncodings, (char *) &encoding,
- sizeof(encoding));
- numEncodings++;
- }
- Tcl_UtfToExternal(NULL, encoding, src, srcLen,
- TCL_ENCODING_STOPONERROR, NULL, dst, sizeof(dst), &srcRead,
- &dstWrote, NULL);
- if (dstWrote == 0) {
- goto crossout;
- }
- /*
- * D. Rank each name and pick the best match.
- */
- scalable = (got.fa.size == 0);
- score = RankAttributes(&want, &got);
- if (score < bestScore[scalable]) {
- bestIdx[scalable] = nameIdx;
- bestScore[scalable] = score;
- }
- if (score == 0) {
- break;
- }
- continue;
- crossout:
- if (nameList == nameListOrig) {
- /*
- * Not allowed to change pointers to memory that X gives you,
- * so make a copy.
- */
- nameList = (char **) ckalloc(numNames * sizeof(char *));
- memcpy(nameList, nameListOrig, numNames * sizeof(char *));
- }
- nameList[nameIdx] = NULL;
- }
- fontStructPtr = GetScreenFont(display, &want, nameList, bestIdx, bestScore);
- encodingCachePtr = (Tcl_Encoding *) Tcl_DStringValue(&dsEncodings);
- for (i = numEncodings; --i >= 0; encodingCachePtr++) {
- Tcl_FreeEncoding(*encodingCachePtr);
- }
- Tcl_DStringFree(&dsEncodings);
- numEncodings = 0;
- if (fontStructPtr == NULL) {
- if (nameList != nameListOrig) {
- ckfree((char *) nameList);
- }
- XFreeFontNames(nameListOrig);
- return NULL;
- }
- InitSubFont(display, fontStructPtr, 0, &subFont);
- if (FontMapLookup(&subFont, ch) == 0) {
- /*
- * E. If the font we picked cannot actually display the character,
- * cross out all names with the same foundry and encoding and pick
- * another font.
- */
- hateFoundry = got.xa.foundry;
- hateCharset = charset;
- ReleaseSubFont(display, &subFont);
- goto retry;
- }
- if (nameList != nameListOrig) {
- ckfree((char *) nameList);
- }
- XFreeFontNames(nameListOrig);
- if (fontPtr->numSubFonts >= SUBFONT_SPACE) {
- SubFont *newPtr;
-
- newPtr = (SubFont *) ckalloc(sizeof(SubFont) * (fontPtr->numSubFonts + 1));
- memcpy((char *) newPtr, fontPtr->subFontArray,
- fontPtr->numSubFonts * sizeof(SubFont));
- if (fixSubFontPtrPtr != NULL) {
- register SubFont *fixSubFontPtr = *fixSubFontPtrPtr;
- if (fixSubFontPtr != &fontPtr->controlSubFont) {
- *fixSubFontPtrPtr =
- newPtr + (fixSubFontPtr - fontPtr->subFontArray);
- }
- }
- if (fontPtr->subFontArray != fontPtr->staticSubFonts) {
- ckfree((char *) fontPtr->subFontArray);
- }
- fontPtr->subFontArray = newPtr;
- }
- fontPtr->subFontArray[fontPtr->numSubFonts] = subFont;
- fontPtr->numSubFonts++;
- return &fontPtr->subFontArray[fontPtr->numSubFonts - 1];
- }
- /*
- *---------------------------------------------------------------------------
- *
- * RankAttributes --
- *
- * Determine how close the attributes of the font in question match
- * the attributes that we want.
- *
- * Results:
- * The return value is the score; lower numbers are better.
- * *scalablePtr is set to 0 if the font was not scalable, 1 otherwise.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static unsigned int
- RankAttributes(wantPtr, gotPtr)
- FontAttributes *wantPtr; /* The desired attributes. */
- FontAttributes *gotPtr; /* The attributes we have to live with. */
- {
- unsigned int penalty;
- penalty = 0;
- if (gotPtr->xa.foundry != wantPtr->xa.foundry) {
- penalty += 4500;
- }
- if (gotPtr->fa.family != wantPtr->fa.family) {
- penalty += 9000;
- }
- if (gotPtr->fa.weight != wantPtr->fa.weight) {
- penalty += 90;
- }
- if (gotPtr->fa.slant != wantPtr->fa.slant) {
- penalty += 60;
- }
- if (gotPtr->xa.slant != wantPtr->xa.slant) {
- penalty += 10;
- }
- if (gotPtr->xa.setwidth != wantPtr->xa.setwidth) {
- penalty += 1000;
- }
- if (gotPtr->fa.size == 0) {
- /*
- * A scalable font is almost always acceptable, but the
- * corresponding bitmapped font would be better.
- */
- penalty += 10;
- } else {
- int diff;
- /*
- * It's worse to be too large than to be too small.
- */
-
- diff = (-gotPtr->fa.size - -wantPtr->fa.size);
- if (diff > 0) {
- penalty += 600;
- } else if (diff < 0) {
- penalty += 150;
- diff = -diff;
- }
- penalty += 150 * diff;
- }
- if (gotPtr->xa.charset != wantPtr->xa.charset) {
- int i;
- CONST char *gotAlias, *wantAlias;
- penalty += 65000;
- gotAlias = GetEncodingAlias(gotPtr->xa.charset);
- wantAlias = GetEncodingAlias(wantPtr->xa.charset);
- if (strcmp(gotAlias, wantAlias) != 0) {
- penalty += 30000;
- for (i = 0; encodingList[i] != NULL; i++) {
- if (strcmp(gotAlias, encodingList[i]) == 0) {
- penalty -= 30000;
- break;
- }
- penalty += 20000;
- }
- }
- }
- return penalty;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * GetScreenFont --
- *
- * Given the names for the best scalable and best bitmapped font,
- * actually construct an XFontStruct based on the best XLFD.
- * This is where all the alias and fallback substitution bottoms
- * out.
- *
- * Results:
- * The screen font that best corresponds to the set of attributes.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static XFontStruct *
- GetScreenFont(display, wantPtr, nameList, bestIdx, bestScore)
- Display *display; /* Display for new XFontStruct. */
- FontAttributes *wantPtr; /* Contains desired actual pixel-size if the
- * best font was scalable. */
- char **nameList; /* Array of XLFDs. */
- int bestIdx[2]; /* Indices into above array for XLFD of
- * best bitmapped and best scalable font. */
- unsigned int bestScore[2]; /* Scores of best bitmapped and best
- * scalable font. XLFD corresponding to
- * lowest score will be constructed. */
- {
- XFontStruct *fontStructPtr;
- if ((bestIdx[0] < 0) && (bestIdx[1] < 0)) {
- return NULL;
- }
- /*
- * Now we know which is the closest matching scalable font and the
- * closest matching bitmapped font. If the scalable font was a
- * better match, try getting the scalable font; however, if the
- * scalable font was not actually available in the desired
- * pointsize, fall back to the closest bitmapped font.
- */
- fontStructPtr = NULL;
- if (bestScore[1] < bestScore[0]) {
- char *str, *rest;
- char buf[256];
- int i;
-
- /*
- * Fill in the desired pixel size for this font.
- */
- tryscale:
- str = nameList[bestIdx[1]];
- for (i = 0; i < XLFD_PIXEL_SIZE; i++) {
- str = strchr(str + 1, '-');
- }
- rest = str;
- for (i = XLFD_PIXEL_SIZE; i < XLFD_CHARSET; i++) {
- rest = strchr(rest + 1, '-');
- }
- *str = ' ';
- sprintf(buf, "%.200s-%d-*-*-*-*-*%s", nameList[bestIdx[1]],
- -wantPtr->fa.size, rest);
- *str = '-';
- fontStructPtr = XLoadQueryFont(display, buf);
- bestScore[1] = INT_MAX;
- }
- if (fontStructPtr == NULL) {
- fontStructPtr = XLoadQueryFont(display, nameList[bestIdx[0]]);
- if (fontStructPtr == NULL) {
- /*
- * This shouldn't happen because the font name is one of the
- * names that X gave us to use, but it does anyhow.
- */
- if (bestScore[1] < INT_MAX) {
- goto tryscale;
- }
- return GetSystemFont(display);
- }
- }
- return fontStructPtr;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * GetSystemFont --
- *
- * Absolute fallback mechanism, called when we need a font and no
- * other font can be found and/or instantiated.
- *
- * Results:
- * A pointer to a font. Never NULL.
- *
- * Side effects:
- * If there are NO fonts installed on the system, this call will
- * panic, but how did you get X running in that case?
- *
- *---------------------------------------------------------------------------
- */
- static XFontStruct *
- GetSystemFont(display)
- Display *display; /* Display for new XFontStruct. */
- {
- XFontStruct *fontStructPtr;
- fontStructPtr = XLoadQueryFont(display, "fixed");
- if (fontStructPtr == NULL) {
- fontStructPtr = XLoadQueryFont(display, "*");
- if (fontStructPtr == NULL) {
- panic("TkpGetFontFromAttributes: cannot get any font");
- }
- }
- return fontStructPtr;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * GetFontAttributes --
- *
- * Given a screen font, determine its actual attributes, which are
- * not necessarily the attributes that were used to construct it.
- *
- * Results:
- * *faPtr is filled with the screen font's attributes.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static int
- GetFontAttributes(display, fontStructPtr, faPtr)
- Display *display; /* Display that owns the screen font. */
- XFontStruct *fontStructPtr; /* Screen font to query. */
- FontAttributes *faPtr; /* For storing attributes of screen font. */
- {
- unsigned long value;
- char *name;
-
- if ((XGetFontProperty(fontStructPtr, XA_FONT, &value) != False) &&
- (value != 0)) {
- name = XGetAtomName(display, (Atom) value);
- if (TkFontParseXLFD(name, &faPtr->fa, &faPtr->xa) != TCL_OK) {
- faPtr->fa.family = Tk_GetUid(name);
- faPtr->xa.foundry = Tk_GetUid("");
- faPtr->xa.charset = Tk_GetUid("");
- }
- XFree(name);
- } else {
- TkInitFontAttributes(&faPtr->fa);
- TkInitXLFDAttributes(&faPtr->xa);
- }
- /*
- * Do last ditch check for family. It seems that some X servers can
- * fail on the X font calls above, slipping through earlier checks.
- * X-Win32 5.4 is one of these.
- */
- if (faPtr->fa.family == NULL) {
- faPtr->fa.family = Tk_GetUid("");
- faPtr->xa.foundry = Tk_GetUid("");
- faPtr->xa.charset = Tk_GetUid("");
- }
- return IdentifySymbolEncodings(faPtr);
- }
- /*
- *---------------------------------------------------------------------------
- *
- * ListFonts --
- *
- * Utility function to return the array of all XLFDs on the system
- * with the specified face name.
- *
- * Results:
- * The return value is an array of XLFDs, which should be freed with
- * XFreeFontNames(), or NULL if no XLFDs matched the requested name.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
-
- static char **
- ListFonts(display, faceName, numNamesPtr)
- Display *display; /* Display to query. */
- CONST char *faceName; /* Desired face name, or "*" for all. */
- int *numNamesPtr; /* Filled with length of returned array, or
- * 0 if no names were found. */
- {
- char buf[256];
- sprintf(buf, "-*-%.80s-*-*-*-*-*-*-*-*-*-*-*-*", faceName);
- return XListFonts(display, buf, 10000, numNamesPtr);
- }
- static char **
- ListFontOrAlias(display, faceName, numNamesPtr)
- Display *display; /* Display to query. */
- CONST char *faceName; /* Desired face name, or "*" for all. */
- int *numNamesPtr; /* Filled with length of returned array, or
- * 0 if no names were found. */
- {
- char **nameList, **aliases;
- int i;
-
- nameList = ListFonts(display, faceName, numNamesPtr);
- if (nameList != NULL) {
- return nameList;
- }
- aliases = TkFontGetAliasList(faceName);
- if (aliases != NULL) {
- for (i = 0; aliases[i] != NULL; i++) {
- nameList = ListFonts(display, aliases[i], numNamesPtr);
- if (nameList != NULL) {
- return nameList;
- }
- }
- }
- *numNamesPtr = 0;
- return NULL;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * IdentifySymbolEncodings --
- *
- * If the font attributes refer to a symbol font, update the
- * charset field of the font attributes so that it reflects the
- * encoding of that symbol font. In general, the raw value for
- * the charset field parsed from an XLFD is meaningless for symbol
- * fonts.
- *
- * Symbol fonts are all fonts whose name appears in the symbolClass.
- *
- * Results:
- * The return value is non-zero if the font attributes specify a
- * symbol font, or 0 otherwise. If a non-zero value is returned
- * the charset field of the font attributes will be changed to
- * the string that represents the actual encoding for the symbol font.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static int
- IdentifySymbolEncodings(faPtr)
- FontAttributes *faPtr;
- {
- int i, j;
- char **aliases, **symbolClass;
- symbolClass = TkFontGetSymbolClass();
- for (i = 0; symbolClass[i] != NULL; i++) {
- if (strcasecmp(faPtr->fa.family, symbolClass[i]) == 0) {
- faPtr->xa.charset = Tk_GetUid(GetEncodingAlias(symbolClass[i]));
- return 1;
- }
- aliases = TkFontGetAliasList(symbolClass[i]);
- for (j = 0; (aliases != NULL) && (aliases[j] != NULL); j++) {
- if (strcasecmp(faPtr->fa.family, aliases[j]) == 0) {
- faPtr->xa.charset = Tk_GetUid(GetEncodingAlias(aliases[j]));
- return 1;
- }
- }
- }
- return 0;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * GetEncodingAlias --
- *
- * Map the name of an encoding to another name that should be used
- * when actually loading the encoding. For instance, the encodings
- * "jisc6226.1978", "jisx0208.1983", "jisx0208.1990", and
- * "jisx0208.1996" are well-known names for the same encoding and
- * are represented by one encoding table: "jis0208".
- *
- * Results:
- * As above. If the name has no alias, the original name is returned.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static CONST char *
- GetEncodingAlias(name)
- CONST char *name; /* The name to look up. */
- {
- EncodingAlias *aliasPtr;
-
- for (aliasPtr = encodingAliases; aliasPtr->aliasPattern != NULL; ) {
- if (Tcl_StringMatch((char *) name, aliasPtr->aliasPattern)) {
- return aliasPtr->realName;
- }
- aliasPtr++;
- }
- return name;
- }