tkMacOSXFont.c
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- /*
- * tkMacOSXFont.c --
- *
- * Contains the Macintosh implementation of the platform-independant
- * font package interface.
- *
- * Copyright (c) 1990-1994 The Regents of the University of California.
- * Copyright (c) 1994-1997 Sun Microsystems, Inc.
- * Copyright 2001, Apple Computer, Inc.
- * Copyright (c) 2006-2007 Daniel A. Steffen <das@users.sourceforge.net>
- *
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tkMacOSXFont.c,v 1.3.2.11 2007/11/09 06:26:55 das Exp $
- */
- #include "tkMacOSXPrivate.h"
- #include "tkMacOSXFont.h"
- #include "tclInt.h" /* for Tcl_CreateNamespace() */
- /*
- * Dealing with pascal strings.
- */
- #ifndef StrLength
- #define StrLength(s) (*((unsigned char *) (s)))
- #endif
- #ifndef StrBody
- #define StrBody(s) ((char *) (s) + 1)
- #endif
- #define pstrcmp(s1, s2) RelString((s1), (s2), 1, 1)
- #define pstrcasecmp(s1, s2) RelString((s1), (s2), 0, 1)
- /*
- * The preferred font encodings.
- */
- static const char *encodingList[] = {
- "macRoman", "macJapan", NULL
- };
- /*
- * The following structures are used to map the script/language codes of a
- * font to the name that should be passed to Tcl_GetTextEncoding() to obtain
- * the encoding for that font. The set of numeric constants is fixed and
- * defined by Apple.
- */
- static TkStateMap scriptMap[] = {
- {smRoman, "macRoman"},
- {smJapanese, "macJapan"},
- {smTradChinese, "macChinese"},
- {smKorean, "macKorean"},
- {smArabic, "macArabic"},
- {smHebrew, "macHebrew"},
- {smGreek, "macGreek"},
- {smCyrillic, "macCyrillic"},
- {smRSymbol, "macRSymbol"},
- {smDevanagari, "macDevanagari"},
- {smGurmukhi, "macGurmukhi"},
- {smGujarati, "macGujarati"},
- {smOriya, "macOriya"},
- {smBengali, "macBengali"},
- {smTamil, "macTamil"},
- {smTelugu, "macTelugu"},
- {smKannada, "macKannada"},
- {smMalayalam, "macMalayalam"},
- {smSinhalese, "macSinhalese"},
- {smBurmese, "macBurmese"},
- {smKhmer, "macKhmer"},
- {smThai, "macThailand"},
- {smLaotian, "macLaos"},
- {smGeorgian, "macGeorgia"},
- {smArmenian, "macArmenia"},
- {smSimpChinese, "macSimpChinese"},
- {smTibetan, "macTIbet"},
- {smMongolian, "macMongolia"},
- {smGeez, "macEthiopia"},
- {smEastEurRoman, "macCentEuro"},
- {smVietnamese, "macVietnam"},
- {smExtArabic, "macSindhi"},
- {0, NULL}
- };
- static TkStateMap romanMap[] = {
- {langCroatian, "macCroatian"},
- {langSlovenian, "macCroatian"},
- {langIcelandic, "macIceland"},
- {langRomanian, "macRomania"},
- {langTurkish, "macTurkish"},
- {langGreek, "macGreek"},
- {0, NULL}
- };
- static TkStateMap cyrillicMap[] = {
- {langUkrainian, "macUkraine"},
- {langBulgarian, "macBulgaria"},
- {0, 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 Macintosh, a "font family" is uniquely identified by its face number.
- */
- #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.
- */
- FMFontFamily faceNum; /* Unique face number key for this FontFamily. */
- /*
- * Derived properties.
- */
- Tcl_Encoding encoding; /* Encoding for this font family. */
- int isSymbolFont; /* Non-zero if this is a symbol family. */
- int isMultiByteFont; /* Non-zero if this is a multi-byte family. */
- char typeTable[256]; /* Table that identfies all lead bytes for a
- * multi-byte family, used when measuring chars.
- * If a byte is a lead byte, the value at the
- * corresponding position in the typeTable is 1,
- * otherwise 0. If this is a single-byte font,
- * all entries are 0. */
- 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 added. 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. */
- FontFamily *familyPtr; /* The FontFamily for this SubFont. */
- } SubFont;
- /*
- * The following structure represents Macintosh's implementation of a font
- * object.
- */
- #define SUBFONT_SPACE 3
- typedef struct MacFont {
- 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. */
- short size; /* Font size in pixels, constructed from
- * font attributes. */
- short style; /* Style bits, constructed from font
- * attributes. */
- } MacFont;
- /*
- * The following structure is used to map between the UTF-8 name for a font and
- * the name that the Macintosh uses to refer to the font, in order to determine
- * if a font exists. The Macintosh names for fonts are stored in the encoding
- * of the font itself.
- */
- typedef struct FontNameMap {
- Tk_Uid utfName; /* The name of the font in UTF-8. */
- StringPtr nativeName; /* The name of the font in the font's encoding. */
- FMFontFamily faceNum; /* Unique face number for this font. */
- } FontNameMap;
- /*
- * 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.
- */
- static FontFamily *fontFamilyList = NULL;
- /*
- * Information cached about the system at startup time.
- */
- static FontNameMap *gFontNameMap = NULL;
- static GWorldPtr gWorld = NULL;
- /*
- * The names for our "native" fonts.
- */
- #define SYSTEMFONT_NAME "system"
- #define APPLFONT_NAME "application"
- #define MENUITEMFONT_NAME "menu"
- /*
- * Procedures used only in this file.
- */
- static FontFamily * AllocFontFamily(const MacFont *fontPtr, int family);
- static SubFont * CanUseFallback(MacFont *fontPtr, const char *fallbackName, int ch, SubFont **fixSubFontPtrPtr);
- static SubFont * CanUseFallbackWithAliases(MacFont *fontPtr, const char *faceName, int ch, Tcl_DString *nameTriedPtr, SubFont **fixSubFontPtrPtr);
- static SubFont * FindSubFontForChar(MacFont *fontPtr, int ch, SubFont **fixSubFontPtrPtr);
- static void FontMapInsert(SubFont *subFontPtr, int ch);
- static void FontMapLoadPage(SubFont *subFontPtr, int row);
- static int FontMapLookup(SubFont *subFontPtr, int ch);
- static void FreeFontFamily(FontFamily *familyPtr);
- static void InitFont(Tk_Window tkwin, int family, unsigned char *familyName, int size, int style, MacFont *fontPtr);
- static void InitSubFont(const MacFont *fontPtr, int family, SubFont *subFontPtr);
- static void MultiFontDrawText(MacFont *fontPtr, const char *source, int numBytes, int x, int y);
- static void ReleaseFont(MacFont *fontPtr);
- static void ReleaseSubFont(SubFont *subFontPtr);
- static int SeenName(const char *name, Tcl_DString *dsPtr);
- static const char * BreakLine(FontFamily *familyPtr, int flags, const char *source, int numBytes, int *widthPtr);
- static int GetFamilyNum(const char *faceName, short *familyPtr);
- static int GetFamilyOrAliasNum(const char *faceName, short *familyPtr);
- static Tcl_Encoding GetFontEncoding(int faceNum, int allowSymbol, int *isSymbolPtr);
- static Tk_Uid GetUtfFaceName(StringPtr faceNameStr);
- static OSStatus GetThemeFontAndFamily(const ThemeFontID themeFontId,
- FMFontFamily *fontFamily, unsigned char *fontName, SInt16 *fontSize,
- Style *fontStyle);
- /*
- *-------------------------------------------------------------------------
- *
- * TkpFontPkgInit --
- *
- * This procedure is called when an application is created. It
- * initializes all the structures that are used by the
- * platform-dependant code on a per application basis.
- *
- * Results:
- * None.
- *
- * Side effects:
- * See comments below.
- *
- *-------------------------------------------------------------------------
- */
- void
- TkpFontPkgInit(
- TkMainInfo *mainPtr) /* The application being created. */
- {
- FMFontFamilyIterator fontFamilyIterator;
- FMFontFamily fontFamily;
- FontNameMap *tmpFontNameMap, *newFontNameMap, *mapPtr;
- int i, j, numFonts, fontMapOffset, isSymbol;
- Str255 nativeName;
- Tcl_DString ds;
- Tcl_Encoding encoding;
- Tcl_Encoding *encodings;
- if (gWorld == NULL) {
- Rect rect = {0, 0, 1, 1};
- SetFractEnable(0);
- /*
- * Used for saving and restoring state while drawing and measuring.
- */
- if (ChkErr(NewGWorld, &gWorld, 32, &rect, NULL, NULL, 0
- #ifdef __LITTLE_ENDIAN__
- | kNativeEndianPixMap
- #endif
- ) != noErr) {
- Tcl_Panic("TkpFontPkgInit: NewGWorld failed");
- }
- /*
- * The name of each font is stored in the encoding of that font.
- * How would we translate a name from UTF-8 into the native encoding
- * of the font unless we knew the encoding of that font? We can't.
- * So, precompute the UTF-8 and native names of all fonts on the
- * system. The when the user asks for font by its UTF-8 name, we
- * lookup the name in that table and really ask for the font by its
- * native name. Any unknown UTF-8 names will be mapped to the system
- * font.
- */
- FMCreateFontFamilyIterator(NULL, NULL, kFMDefaultOptions, &fontFamilyIterator);
- numFonts = 0;
- while (FMGetNextFontFamily(&fontFamilyIterator, &fontFamily) != kFMIterationCompleted) {
- numFonts++;
- }
- tmpFontNameMap = (FontNameMap *) ckalloc(sizeof(FontNameMap) * numFonts);
- encodings = (Tcl_Encoding *) ckalloc(sizeof(Tcl_Encoding) * numFonts);
- mapPtr = tmpFontNameMap;
- FMResetFontFamilyIterator(NULL, NULL, kFMDefaultOptions, &fontFamilyIterator);
- i = 0;
- while (FMGetNextFontFamily(&fontFamilyIterator, &fontFamily) != kFMIterationCompleted) {
- mapPtr->faceNum = fontFamily;
- encodings[i] = GetFontEncoding(mapPtr->faceNum, 0, &isSymbol);
- FMGetFontFamilyName(fontFamily, nativeName );
- Tcl_ExternalToUtfDString(encodings[i], StrBody(nativeName), StrLength(nativeName), &ds);
- mapPtr->utfName = Tk_GetUid(Tcl_DStringValue(&ds));
- mapPtr->nativeName = (StringPtr) ckalloc(StrLength(nativeName) + 1);
- memcpy(mapPtr->nativeName, nativeName, StrLength(nativeName) + 1);
- Tcl_DStringFree(&ds);
- mapPtr++;
- i++;
- }
- FMDisposeFontFamilyIterator(&fontFamilyIterator);
- /*
- * Reorder FontNameMap so fonts with the preferred encodings are at
- * the front of the list. The relative order of fonts that all have
- * the same encoding is preserved. Fonts with unknown encodings get
- * stuck at the end.
- */
- newFontNameMap = (FontNameMap *) ckalloc(sizeof(FontNameMap) * (numFonts + 1));
- fontMapOffset = 0;
- for (i = 0; encodingList[i] != NULL; i++) {
- encoding = Tcl_GetEncoding(NULL, encodingList[i]);
- if (encoding == NULL) {
- continue;
- }
- for (j = 0; j < numFonts; j++) {
- if (encodings[j] == encoding) {
- newFontNameMap[fontMapOffset] = tmpFontNameMap[j];
- fontMapOffset++;
- Tcl_FreeEncoding(encodings[j]);
- tmpFontNameMap[j].utfName = NULL;
- }
- }
- Tcl_FreeEncoding(encoding);
- }
- for (i = 0; i < numFonts; i++) {
- if (tmpFontNameMap[i].utfName != NULL) {
- newFontNameMap[fontMapOffset] = tmpFontNameMap[i];
- fontMapOffset++;
- Tcl_FreeEncoding(encodings[i]);
- }
- }
- if (fontMapOffset != numFonts) {
- Tcl_Panic("TkpFontPkgInit: unexpected number of fonts");
- }
- mapPtr = &newFontNameMap[numFonts];
- mapPtr->utfName = NULL;
- mapPtr->nativeName = NULL;
- mapPtr->faceNum = 0;
- ckfree((char *) tmpFontNameMap);
- ckfree((char *) encodings);
- gFontNameMap = newFontNameMap;
- }
- }
- /*
- *---------------------------------------------------------------------------
- *
- * GetThemeFontAndFamily --
- *
- * Wrapper around the GetThemeFont and FMGetFontFamilyFromName APIs.
- *
- *---------------------------------------------------------------------------
- */
- OSStatus
- GetThemeFontAndFamily(
- const ThemeFontID themeFontId,
- FMFontFamily* fontFamily,
- unsigned char *fontName,
- SInt16 *fontSize,
- Style *fontStyle)
- {
- OSStatus err = ChkErr(GetThemeFont, themeFontId, smSystemScript, fontName,
- fontSize, fontStyle);
- if (err == noErr) {
- *fontFamily = FMGetFontFamilyFromName(fontName);
- if (*fontFamily == kInvalidFontFamily) {
- err = kFMInvalidFontFamilyErr;
- TkMacOSXDbgMsg("FMGetFontFamilyFromName failed.");
- }
- }
- return err;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * 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 generics TkFont before calling TkpDeleteFont().
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- TkFont *
- TkpGetNativeFont(
- Tk_Window tkwin, /* For display where font will be used. */
- CONST char *name) /* Platform-specific font name. */
- {
- ThemeFontID themeFontId;
- FMFontFamily fontFamily;
- Str255 fontName;
- SInt16 fontSize;
- Style fontStyle;
- MacFont * fontPtr;
- if (strcmp(name, SYSTEMFONT_NAME) == 0) {
- themeFontId = kThemeSystemFont;
- } else if (strcmp(name, APPLFONT_NAME) == 0) {
- themeFontId = kThemeApplicationFont;
- } else if (strcmp(name, MENUITEMFONT_NAME) == 0) {
- themeFontId = kThemeMenuItemFont;
- } else {
- return NULL;
- }
- if (GetThemeFontAndFamily(themeFontId, &fontFamily, fontName, &fontSize,
- &fontStyle) != noErr) {
- return NULL;
- }
- fontPtr = (MacFont *) ckalloc(sizeof(MacFont));
- InitFont(tkwin, fontFamily, fontName, fontSize, fontStyle, 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:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- TkFont *
- TkpGetFontFromAttributes(
- 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. */
- {
- short faceNum, style;
- int i, j;
- const char *faceName, *fallback;
- char ***fallbacks;
- MacFont *fontPtr;
- /*
- * Algorithm to get the closest font to the one requested.
- *
- * try fontname
- * try all aliases for fontname
- * foreach fallback for fontname
- * try the fallback
- * try all aliases for the fallback
- */
- faceNum = 0;
- faceName = faPtr->family;
- if (faceName != NULL) {
- if (GetFamilyOrAliasNum(faceName, &faceNum) != 0) {
- goto found;
- }
- fallbacks = TkFontGetFallbacks();
- for (i = 0; fallbacks[i] != NULL; i++) {
- for (j = 0; (fallback = fallbacks[i][j]) != NULL; j++) {
- if (strcasecmp(faceName, fallback) == 0) {
- for (j = 0; (fallback = fallbacks[i][j]) != NULL; j++) {
- if (GetFamilyOrAliasNum(fallback, &faceNum)) {
- goto found;
- }
- }
- }
- break;
- }
- }
- }
- found:
- style = 0;
- if (faPtr->weight != TK_FW_NORMAL) {
- style |= bold;
- }
- if (faPtr->slant != TK_FS_ROMAN) {
- style |= italic;
- }
- if (faPtr->underline) {
- style |= underline;
- }
- if (tkFontPtr == NULL) {
- fontPtr = (MacFont *) ckalloc(sizeof(MacFont));
- } else {
- fontPtr = (MacFont *) tkFontPtr;
- ReleaseFont(fontPtr);
- }
- InitFont(tkwin, faceNum, NULL, faPtr->size, style, fontPtr);
- 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:
- * TkFont is deallocated.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- void
- TkpDeleteFont(
- TkFont *tkFontPtr) /* Token of font to be deleted. */
- {
- ReleaseFont((MacFont *) tkFontPtr);
- }
- /*
- *---------------------------------------------------------------------------
- *
- * 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(
- Tcl_Interp *interp, /* Interp to hold result. */
- Tk_Window tkwin) /* For display to query. */
- {
- FontNameMap *mapPtr;
- Tcl_Obj *resultPtr, *strPtr;
- resultPtr = Tcl_GetObjResult(interp);
- for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
- strPtr = Tcl_NewStringObj(mapPtr->utfName, -1);
- Tcl_ListObjAppendElement(NULL, resultPtr, strPtr);
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * 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(
- Tcl_Interp *interp, /* Interp to hold result. */
- Tk_Font tkfont) /* Font object to query. */
- {
- int i;
- Tcl_Obj *resultPtr, *strPtr;
- MacFont *fontPtr;
- FontFamily *familyPtr;
- Str255 nativeName;
- resultPtr = Tcl_GetObjResult(interp);
- fontPtr = (MacFont *) tkfont;
- for (i = 0; i < fontPtr->numSubFonts; i++) {
- familyPtr = fontPtr->subFontArray[i].familyPtr;
- GetFontName(familyPtr->faceNum, nativeName);
- strPtr = Tcl_NewStringObj(GetUtfFaceName(nativeName), -1);
- Tcl_ListObjAppendElement(NULL, resultPtr, strPtr);
- }
- }
- /*
- *---------------------------------------------------------------------------
- *
- * 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(
- 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; 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. */
- {
- MacFont *fontPtr;
- SubFont *thisSubFontPtr, *lastSubFontPtr;
- CGrafPtr savePort;
- Boolean portChanged;
- int curX, curByte;
- /*
- * According to "Inside Macintosh: Text", the Macintosh may
- * automatically substitute
- * ligatures or context-sensitive presentation forms when
- * measuring/displaying text within a font run. We cannot safely
- * measure individual characters and add up the widths w/o errors.
- * However, if we convert a range of text from UTF-8 to, say,
- * Shift-JIS, and get the offset into the Shift-JIS string as to
- * where a word or line break would occur, then can we map that
- * number back to UTF-8?
- */
- fontPtr = (MacFont *) tkfont;
- portChanged = QDSwapPort(gWorld, &savePort);
- TextSize(fontPtr->size);
- TextFace(fontPtr->style);
- lastSubFontPtr = &fontPtr->subFontArray[0];
- if (numBytes == 0) {
- curX = 0;
- curByte = 0;
- } else if (maxLength < 0) {
- const char *p, *end, *next;
- Tcl_UniChar ch;
- 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;
- TextFont(familyPtr->faceNum);
- Tcl_UtfToExternalDString(familyPtr->encoding, source,
- p - source, &runString);
- curX += TextWidth(Tcl_DStringValue(&runString), 0,
- Tcl_DStringLength(&runString));
- Tcl_DStringFree(&runString);
- lastSubFontPtr = thisSubFontPtr;
- source = p;
- }
- p = next;
- }
- familyPtr = lastSubFontPtr->familyPtr;
- TextFont(familyPtr->faceNum);
- Tcl_UtfToExternalDString(familyPtr->encoding, source, p - source,
- &runString);
- curX += TextWidth(Tcl_DStringValue(&runString), 0,
- Tcl_DStringLength(&runString));
- Tcl_DStringFree(&runString);
- curByte = numBytes;
- } else {
- const char *p, *end, *next, *sourceOrig;
- int widthLeft;
- Tcl_UniChar ch;
- const char *rest = NULL;
- /*
- * How many chars will fit in the space allotted?
- */
- if (maxLength > 32767) {
- maxLength = 32767;
- }
- widthLeft = maxLength;
- sourceOrig = source;
- end = source + numBytes;
- for (p = source; p < end; p = next) {
- next = p + Tcl_UtfToUniChar(p, &ch);
- thisSubFontPtr = FindSubFontForChar(fontPtr, ch, &lastSubFontPtr);
- if (thisSubFontPtr != lastSubFontPtr) {
- if (p > source) {
- rest = BreakLine(lastSubFontPtr->familyPtr, flags, source,
- p - source, &widthLeft);
- flags &= ~TK_AT_LEAST_ONE;
- if (rest != NULL) {
- p = source;
- break;
- }
- }
- lastSubFontPtr = thisSubFontPtr;
- source = p;
- }
- }
- if (p > source) {
- rest = BreakLine(lastSubFontPtr->familyPtr, flags, source, p - source,
- &widthLeft);
- }
- if (rest == NULL) {
- curByte = numBytes;
- } else {
- curByte = rest - sourceOrig;
- }
- curX = maxLength - widthLeft;
- }
- if (portChanged) {
- QDSwapPort(savePort, NULL);
- }
- *lengthPtr = curX;
- return curByte;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * BreakLine --
- *
- * Determine where the given line of text should be broken so that it
- * fits in the specified range. Before calling this function, the
- * font values and graphics port must be set.
- *
- * Results:
- * The return value is NULL if the specified range is larger that the
- * space the text needs, and *widthLeftPtr is filled with how much
- * space is left in the range after measuring the whole text buffer.
- * Otherwise, the return value is a pointer into the text buffer that
- * indicates where the line should be broken (up to, but not including
- * that character), and *widthLeftPtr is filled with how much space is
- * left in the range after measuring up to that character.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- static const char *
- BreakLine(
- FontFamily *familyPtr, /* FontFamily that describes the font values
- * that are already selected into the graphics
- * port. */
- 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. */
- 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 *widthLeftPtr) /* On input, specifies size of range into
- * which characters from source buffer should
- * be fit. On output, filled with how much
- * space is left after fitting as many
- * characters as possible into the range.
- * Result may be negative if TK_AT_LEAST_ONE
- * was specified in the flags argument. */
- {
- Fixed pixelWidth, widthLeft;
- StyledLineBreakCode breakCode;
- Tcl_DString runString;
- long textOffset;
- Boolean leadingEdge;
- Point point;
- int charOffset, thisCharWasDoubleByte;
- char *p, *end, *typeTable;
- TextFont(familyPtr->faceNum);
- Tcl_UtfToExternalDString(familyPtr->encoding, source, numBytes,
- &runString);
- pixelWidth = IntToFixed(*widthLeftPtr) + 1;
- if (flags & TK_WHOLE_WORDS) {
- textOffset = (flags & TK_AT_LEAST_ONE);
- widthLeft = pixelWidth;
- breakCode = StyledLineBreak(Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString), 0, Tcl_DStringLength(&runString),
- 0, &widthLeft, &textOffset);
- if (breakCode != smBreakOverflow) {
- /*
- * StyledLineBreak includes all the space characters at the end of
- * line that we want to suppress.
- */
- textOffset = VisibleLength(Tcl_DStringValue(&runString), textOffset);
- goto getoffset;
- }
- } else {
- point.v = 1;
- point.h = 1;
- textOffset = PixelToChar(Tcl_DStringValue(&runString),
- Tcl_DStringLength(&runString), 0, pixelWidth, &leadingEdge,
- &widthLeft, smOnlyStyleRun, point, point);
- if (FixedToInt(widthLeft) < 0) {
- goto getoffset;
- }
- }
- *widthLeftPtr = FixedToInt(widthLeft);
- Tcl_DStringFree(&runString);
- return NULL;
- /*
- * The conversion routine that converts UTF-8 to the target encoding
- * must map one UTF-8 character to exactly one encoding-specific
- * character, so that the following algorithm works:
- *
- * 1. Get byte offset of where line should be broken.
- * 2. Get char offset corresponding to that byte offset.
- * 3. Map that char offset to byte offset in UTF-8 string.
- */
- getoffset:
- thisCharWasDoubleByte = 0;
- if (familyPtr->isMultiByteFont == 0) {
- charOffset = textOffset;
- } else {
- charOffset = 0;
- typeTable = familyPtr->typeTable;
- p = Tcl_DStringValue(&runString);
- end = p + textOffset;
- thisCharWasDoubleByte = typeTable[*((unsigned char *) p)];
- for ( ; p < end; p++) {
- thisCharWasDoubleByte = typeTable[*((unsigned char *) p)];
- p += thisCharWasDoubleByte;
- charOffset++;
- }
- }
- if ((flags & TK_WHOLE_WORDS) == 0) {
- if ((flags & TK_PARTIAL_OK) && (leadingEdge != 0)) {
- textOffset += thisCharWasDoubleByte;
- textOffset++;
- charOffset++;
- } else if (((flags & TK_PARTIAL_OK) == 0) && (leadingEdge == 0)) {
- textOffset -= thisCharWasDoubleByte;
- textOffset--;
- charOffset--;
- }
- }
- if ((textOffset == 0) && (Tcl_DStringLength(&runString) > 0)
- && (flags & TK_AT_LEAST_ONE)) {
- p = Tcl_DStringValue(&runString);
- textOffset += familyPtr->typeTable[*((unsigned char *) p)];
- textOffset++;
- charOffset++;
- }
- *widthLeftPtr = FixedToInt(pixelWidth)
- - TextWidth(Tcl_DStringValue(&runString), 0, textOffset);
- Tcl_DStringFree(&runString);
- return Tcl_UtfAtIndex(source, charOffset);
- }
- /*
- *---------------------------------------------------------------------------
- *
- * Tk_DrawChars --
- *
- * Draw a string of characters on the screen.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Information gets drawn on the screen.
- *
- *---------------------------------------------------------------------------
- */
- void
- Tk_DrawChars(
- 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, int y) /* Coordinates at which to place origin of the
- * string when drawing. */
- {
- MacDrawable *macWin = (MacDrawable *) drawable;
- MacFont *fontPtr = (MacFont *) tkfont;
- TkMacOSXDrawingContext drawingContext;
- if (!TkMacOSXSetupDrawingContext(drawable, gc, 0, &drawingContext)) {
- return;
- }
- #if 0
- /*
- * Stippled QD text drawing only kind of works and is ugly, so disable it
- * for now:
- */
- if ((gc->fill_style == FillStippled
- || gc->fill_style == FillOpaqueStippled)
- && gc->stipple != None) {
- TkMacOSXDrawingContext pixmapDrawingContext;
- BitMapPtr stippleMap;
- Pixmap pixmap;
- Pattern white;
- Rect bounds = drawingContext.portBounds;
- OffsetRect(&bounds, macWin->xOff + x, 0);
- stippleMap = TkMacOSXMakeStippleMap(drawable, gc->stipple);
- pixmap = Tk_GetPixmap(display, drawable,
- stippleMap->bounds.right, stippleMap->bounds.bottom, 0);
- if (!TkMacOSXSetupDrawingContext(pixmap, gc, 0,
- &pixmapDrawingContext)) {
- return;
- }
- GetQDGlobalsWhite(&white);
- FillRect(&stippleMap->bounds, &white);
- MultiFontDrawText(fontPtr, source, numBytes, 0, macWin->yOff + y);
- TkMacOSXRestoreDrawingContext(&pixmapDrawingContext);
- CopyDeepMask(GetPortBitMapForCopyBits(TkMacOSXGetDrawablePort(pixmap)),
- stippleMap, GetPortBitMapForCopyBits(
- TkMacOSXGetDrawablePort(drawable)), &stippleMap->bounds,
- &stippleMap->bounds, &bounds, srcOr, NULL);
- /* TODO: this doesn't work quite right - it does a blend. You can't
- * draw white text when you have a stipple.
- */
- Tk_FreePixmap(display, pixmap);
- ckfree(stippleMap->baseAddr);
- ckfree((char *)stippleMap);
- } else
- #endif
- {
- MultiFontDrawText(fontPtr, source, numBytes, macWin->xOff + x,
- macWin->yOff + y);
- }
- TkMacOSXRestoreDrawingContext(&drawingContext);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * MultiFontDrawText --
- *
- * Helper function for Tk_DrawChars. Draws characters, using the
- * various screen fonts in fontPtr to draw multilingual characters.
- * Note: No bidirectional support.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Information gets drawn on the screen.
- * Contents of fontPtr may be modified if more subfonts were loaded
- * in order to draw all the multilingual characters in the given
- * string.
- *
- *-------------------------------------------------------------------------
- */
- static void
- MultiFontDrawText(
- MacFont *fontPtr, /* Contains set of fonts to use when drawing
- * following string. */
- const char *source, /* Potentially multilingual UTF-8 string. */
- int numBytes, /* Length of string in bytes. */
- int x, int y) /* Coordinates at which to place origin *
- * of string when drawing. */
- {
- SubFont *thisSubFontPtr, *lastSubFontPtr;
- FontFamily *familyPtr;
- Tcl_DString runString;
- const char *p, *end, *next;
- Tcl_UniChar ch;
- TextSize(fontPtr->size);
- TextFace(fontPtr->style);
- lastSubFontPtr = &fontPtr->subFontArray[0];
- end = source + numBytes;
- for (p = source; p < end; ) {
- next = p + Tcl_UtfToUniChar(p, &ch);
- thisSubFontPtr = FindSubFontForChar(fontPtr, ch, &lastSubFontPtr);
- if (thisSubFontPtr != lastSubFontPtr) {
- if (p > source) {
- familyPtr = lastSubFontPtr->familyPtr;
- TextFont(familyPtr->faceNum);
- Tcl_UtfToExternalDString(familyPtr->encoding, source,
- p - source, &runString);
- MoveTo((short) x, (short) y);
- DrawText(Tcl_DStringValue(&runString), 0,
- Tcl_DStringLength(&runString));
- x += TextWidth(Tcl_DStringValue(&runString), 0,
- Tcl_DStringLength(&runString));
- Tcl_DStringFree(&runString);
- source = p;
- }
- lastSubFontPtr = thisSubFontPtr;
- }
- p = next;
- }
- if (p > source) {
- familyPtr = lastSubFontPtr->familyPtr;
- TextFont(familyPtr->faceNum);
- Tcl_UtfToExternalDString(familyPtr->encoding, source,
- p - source, &runString);
- MoveTo((short) x, (short) y);
- DrawText(Tcl_DStringValue(&runString), 0,
- Tcl_DStringLength(&runString));
- Tcl_DStringFree(&runString);
- }
- }
- /*
- *---------------------------------------------------------------------------
- *
- * TkMacOSXIsCharacterMissing --
- *
- * Given a tkFont and a character determines whether the character has
- * a glyph defined in the font or not. Note that this is potentially
- * not compatible with Mac OS 8 as it looks at the font handle
- * structure directly. Looks into the character array of the font
- * handle to determine whether the glyph is defined or not.
- *
- * Results:
- * Returns a 1 if the character is missing, a 0 if it is not.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- int
- TkMacOSXIsCharacterMissing(
- Tk_Font tkfont, /* The font we are looking in. */
- unsigned int searchChar) /* The character we are looking for. */
- {
- /*
- * For some reason, FMSwapFont always returns a NULL font handle under OS X
- * Until we figure this one out, return 0;
- */
- return 0;
- }
- /*
- *---------------------------------------------------------------------------
- *
- * InitFont --
- *
- * Helper for TkpGetNativeFont() and TkpGetFontFromAttributes().
- * Initializes the memory for a MacFont 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 MacFont structure.
- *
- * Side effects:
- * Memory allocated.
- *
- *---------------------------------------------------------------------------
- */
- static void
- InitFont(
- Tk_Window tkwin, /* For display where font will be used. */
- int faceNum, /* Macintosh font number. */
- unsigned char *familyName, /* The font family name or NULL. */
- int size, /* Point size for Macintosh font. */
- int style, /* Macintosh style bits. */
- MacFont *fontPtr) /* Filled with information constructed from
- * the above arguments. */
- {
- Str255 nativeName;
- FontInfo fi;
- TkFontAttributes *faPtr;
- TkFontMetrics *fmPtr;
- CGrafPtr savePort;
- Boolean portChanged;
- short pixels;
- if (size == 0) {
- size = -GetDefFontSize();
- }
- pixels = (short) TkFontGetPixels(tkwin, size);
- portChanged = QDSwapPort(gWorld, &savePort);
- TextFont(faceNum);
- TextSize(pixels);
- TextFace(style);
- GetFontInfo(&fi);
- if (!familyName) {
- GetFontName(faceNum, nativeName);
- familyName = nativeName;
- }
- fontPtr->font.fid = (Font) fontPtr;
- faPtr = &fontPtr->font.fa;
- faPtr->family = GetUtfFaceName(familyName);
- faPtr->size = TkFontGetPoints(tkwin, size);
- faPtr->weight = (style & bold) ? TK_FW_BOLD : TK_FW_NORMAL;
- faPtr->slant = (style & italic) ? TK_FS_ITALIC : TK_FS_ROMAN;
- faPtr->underline = ((style & underline) != 0);
- faPtr->overstrike = 0;
- fmPtr = &fontPtr->font.fm;
- fmPtr->ascent = fi.ascent;
- fmPtr->descent = fi.descent;
- fmPtr->maxWidth = fi.widMax;
- fmPtr->fixed = (CharWidth('i') == CharWidth('w'));
- fontPtr->size = pixels;
- fontPtr->style = (short) style;
- fontPtr->numSubFonts = 1;
- fontPtr->subFontArray = fontPtr->staticSubFonts;
- InitSubFont(fontPtr, faceNum, &fontPtr->subFontArray[0]);
- if (portChanged) {
- QDSwapPort(savePort, NULL);
- }
- }
- /*
- *-------------------------------------------------------------------------
- *
- * ReleaseFont --
- *
- * Called to release the Macintosh-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(
- MacFont *fontPtr) /* The font to delete. */
- {
- int i;
- for (i = 0; i < fontPtr->numSubFonts; i++) {
- ReleaseSubFont(&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(
- const MacFont *fontPtr, /* Font object in which the SubFont will be
- * used. */
- int faceNum, /* The font number. */
- SubFont *subFontPtr) /* Filled with SubFont constructed from
- * above attributes. */
- {
- subFontPtr->familyPtr = AllocFontFamily(fontPtr, faceNum);
- 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(
- SubFont *subFontPtr) /* The SubFont to delete. */
- {
- FreeFontFamily(subFontPtr->familyPtr);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * AllocFontFamily --
- *
- * Find the FontFamily structure associated with the given font
- * family. The information should be stored by the caller in a
- * SubFont and used when determining if that SubFont supports a
- * character.
- *
- * 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.
- *
- *-------------------------------------------------------------------------
- */
- static FontFamily *
- AllocFontFamily(
- const MacFont *fontPtr, /* Font object in which the FontFamily will
- * be used. */
- int faceNum) /* The font number. */
- {
- FontFamily *familyPtr;
- int i;
- familyPtr = fontFamilyList;
- for (; familyPtr != NULL; familyPtr = familyPtr->nextPtr) {
- if (familyPtr->faceNum == faceNum) {
- familyPtr->refCount++;
- return familyPtr;
- }
- }
- familyPtr = (FontFamily *) ckalloc(sizeof(FontFamily));
- memset(familyPtr, 0, sizeof(FontFamily));
- familyPtr->nextPtr = fontFamilyList;
- fontFamilyList = familyPtr;
- /*
- * Set key for this FontFamily.
- */
- familyPtr->faceNum = faceNum;
- /*
- * 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;
- familyPtr->encoding = GetFontEncoding(faceNum, 1, &familyPtr->isSymbolFont);
- familyPtr->isMultiByteFont = 0;
- FillParseTable(familyPtr->typeTable, FontToScript(faceNum));
- for (i = 0; i < 256; i++) {
- if (familyPtr->typeTable[i] != 0) {
- familyPtr->isMultiByteFont = 1;
- break;
- }
- }
- return familyPtr;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FreeFontFamily --
- *
- * Called to free a 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(
- FontFamily *familyPtr) /* The FontFamily to delete. */
- {
- FontFamily **familyPtrPtr;
- 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((char *) familyPtr->fontMap[i]);
- }
- }
- /*
- * Delete from list.
- */
- for (familyPtrPtr = &fontFamilyList; ; ) {
- if (*familyPtrPtr == familyPtr) {
- *familyPtrPtr = familyPtr->nextPtr;
- break;
- }
- familyPtrPtr = &(*familyPtrPtr)->nextPtr;
- }
- ckfree((char *) familyPtr);
- }
- /*
- *-------------------------------------------------------------------------
- *
- * FindSubFontForChar --
- *
- * Determine which physical 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(
- MacFont *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;
- const char *fallbackName;
- char **aliases;
- SubFont *subFontPtr;
- FontNameMap *mapPtr;
- Tcl_DString faceNames;
- char ***fontFallbacks;
- char **anyFallbacks;
- 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];
- }
- }
- /*
- * 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(&faceNames);
- aliases = TkFontGetAliasList(fontPtr->font.fa.family);
- subFontPtr = NULL;
- fontFallbacks = TkFontGetFallbacks();
- for (i = 0; fontFallbacks[i] != NULL; i++) {
- for (j = 0; fontFallbacks[i][j] != NULL; j++) {
- fallbackName = fontFallbacks[i][j];
- if (strcasecmp(fallbackName, fontPtr->font.fa.family) == 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(aliases[k], fallbackName) == 0) {
- goto tryfallbacks;
- }
- }
- }
- }
- continue;
- /*
- * ...then see if we can use one of the fallbacks, or an
- * alias for one of the fallbacks.
- */
- tryfallbacks:
- for (j = 0; fontFallbacks[i][j] != NULL; j++) {
- fallbackName = fontFallbacks[i][j];
- subFontPtr = CanUseFallbackWithAliases(fontPtr, fallbackName,
- ch, &faceNames, fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- goto end;
- }
- }
- }
- /*
- * See if we can use something from the global fallback list.
- */
- anyFallbacks = TkFontGetGlobalClass();
- for (i = 0; anyFallbacks[i] != NULL; i++) {
- fallbackName = anyFallbacks[i];
- subFontPtr = CanUseFallbackWithAliases(fontPtr, fallbackName, ch,
- &faceNames, fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- goto end;
- }
- }
- /*
- * Try all face names available in the whole system until we
- * find one that can be used.
- */
- for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
- fallbackName = mapPtr->utfName;
- if (SeenName(fallbackName, &faceNames) == 0) {
- subFontPtr = CanUseFallback(fontPtr, fallbackName, ch,
- fixSubFontPtrPtr);
- if (subFontPtr != NULL) {
- goto end;
- }
- }
- }
- end:
- Tcl_DStringFree(&faceNames);
- if (subFontPtr == NULL) {
- /*
- * No font can display this character. We will use the base font
- * and have it display the "unknown" character.
- */
- subFontPtr = &fontPtr->subFontArray[0];
- 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(
- 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(
- 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 HFONT can (1) or cannot (0) display the
- * characters on the page.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Mempry allocated.
- *
- *-------------------------------------------------------------------------
- */
- static void
- FontMapLoadPage(
- SubFont *subFontPtr, /* Contains font mapping cache to be
- * updated. */
- int row) /* Index of the page to be loaded into
- * the cache. */
- {
- FMInput fm;
- FMOutPtr fmOut;
- int i, end, bitOffset, isMultiByteFont;
- char src[TCL_UTF_MAX];
- unsigned char buf[16];
- int srcRead, dstWrote;
- Tcl_Encoding encoding;
- Handle fHandle = NULL;
- subFontPtr->fontMap[row] = (char *) ckalloc(FONTMAP_BITSPERPAGE / 8);
- memset(subFontPtr->fontMap[row], 0, FONTMAP_BITSPERPAGE / 8);
- encoding = subFontPtr->familyPtr->encoding;
- fm.family = subFontPtr->familyPtr->faceNum;
- fm.size = 12;
- fm.face = 0;
- fm.needBits = 0;
- fm.device = 0;
- fm.numer.h = 1;
- fm.numer.v = 1;
- fm.denom.h = 1;
- fm.denom.v = 1;
- /*
- * For some reason, FMSwapFont alywas returns a structure where the returned font handle
- * is NULL. Until we figure this one out, assume all characters are allowed
- */
- fmOut = FMSwapFont(&fm);
- fHandle = fmOut->fontHandle;
- isMultiByteFont = subFontPtr->familyPtr->isMultiByteFont;
- /*
- * Found an outline font which has very complex font record.
- * Let's just assume *ALL* the characters are allowed.
- */
- end = (row + 1) << FONTMAP_SHIFT;
- for (i = row << FONTMAP_SHIFT; i < end; i++) {
- if (Tcl_UtfToExternal(NULL, encoding, src, Tcl_UniCharToUtf(i,
- src),
- TCL_ENCODING_STOPONERROR, NULL, (char *) buf,
- sizeof(buf),
- &srcRead, &dstWrote, NULL) == TCL_OK) {
- 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(
- MacFont *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. */
- 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(
- 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 physical screen font has not already been loaded
- * into the font object, determine if the specified physical 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
- * font name. NULL is returned if the font object already holds
- * a reference to the specified physical font or if the specified
- * physical font 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(
- MacFont *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;
- SubFont subFont;
- short faceNum;
- if (GetFamilyNum(faceName, &faceNum) == 0) {
- return NULL;
- }
- /*
- * Skip all fonts we've already used.
- */
- for (i = 0; i < fontPtr->numSubFonts; i++) {
- if (faceNum == fontPtr->subFontArray[i].familyPtr->faceNum) {
- return NULL;
- }
- }
- /*
- * Load this font and see if it has the desired character.
- */
- InitSubFont(fontPtr, faceNum, &subFont);
- if (((ch < 256) && (subFont.familyPtr->isSymbolFont))
- || (FontMapLookup(&subFont, ch) == 0)) {
- ReleaseSubFont(&subFont);
- return NULL;
- }
- if (fontPtr->numSubFonts >= SUBFONT_SPACE) {
- SubFont *newPtr = (SubFont *) ckalloc(sizeof(SubFont)
- * (fontPtr->numSubFonts + 1));
- memcpy((char *) newPtr, fontPtr->subFontArray,
- fontPtr->numSubFonts * sizeof(SubFont));
- if (fixSubFontPtrPtr != NULL) {
- /*
- * Fix up the variable pointed to by fixSubFontPtrPtr so it
- * still points into the live array. [Bug 618872]
- */
- *fixSubFontPtrPtr =
- newPtr + (*fixSubFontPtrPtr - 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];
- }
- /*
- *-------------------------------------------------------------------------
- *
- * GetFamilyNum --
- *
- * Determines if any physical screen font exists on the system with
- * the given family name. If the family exists, then it should be
- * possible to construct some physical screen font with that family
- * name.
- *
- * Results:
- * The return value is 0 if the specified font family does not exist,
- * non-zero otherwise. *faceNumPtr is filled with the unique face
- * number that identifies the screen font, or 0 if the font family
- * did not exist.
- *
- * Side effects:
- * None.
- *
- *-------------------------------------------------------------------------
- */
- static int
- GetFamilyNum(
- const char *faceName, /* UTF-8 name of font family to query. */
- short *faceNumPtr) /* Filled with font number for above family. */
- {
- FontNameMap *mapPtr;
- if (faceName != NULL) {
- for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
- if (strcasecmp(faceName, mapPtr->utfName) == 0) {
- *faceNumPtr = mapPtr->faceNum;
- return 1;
- }
- }
- }
- *faceNumPtr = 0;
- return 0;
- }
- static int
- GetFamilyOrAliasNum(
- const char *faceName, /* UTF-8 name of font family to query. */
- short *faceNumPtr) /* Filled with font number for above family. */
- {
- char **aliases;
- int i;
- if (GetFamilyNum(faceName, faceNumPtr) != 0) {
- return 1;
- }
- aliases = TkFontGetAliasList(faceName);
- if (aliases != NULL) {
- for (i = 0; aliases[i] != NULL; i++) {
- if (GetFamilyNum(aliases[i], faceNumPtr) != 0) {
- return 1;
- }
- }
- }
- return 0;
- }
- /*
- *-------------------------------------------------------------------------
- *
- * GetUtfFaceName --
- *
- * Given the native name for a Macintosh font (in which the name of
- * the font is in the encoding of the font itself), return the UTF-8
- * name that corresponds to that font. The specified font name must
- * refer to a font that actually exists on the machine.
- *
- * This function is used to obtain the UTF-8 name when querying the
- * properties of a Macintosh font object.
- *
- * Results:
- * The return value is a pointer to the UTF-8 of the specified font.
- *
- * Side effects:
- * None.
- *
- *------------------------------------------------------------------------
- */
- static Tk_Uid
- GetUtfFaceName(
- StringPtr nativeName) /* Pascal name for font in native encoding. */
- {
- FontNameMap *mapPtr;
- for (mapPtr = gFontNameMap; mapPtr->utfName != NULL; mapPtr++) {
- if (pstrcmp(nativeName, mapPtr->nativeName) == 0) {
- return mapPtr->utfName;
- }
- }
- Tcl_Panic("GetUtfFaceName: unexpected nativeName");
- return NULL;
- }
- /*
- *------------------------------------------------------------------------
- *
- * GetFontEncoding --
- *
- * Return a string that can be passed to Tcl_GetTextEncoding() and
- * used to convert bytes from UTF-8 into the encoding of the
- * specified font.
- *
- * The desired encoding to use to convert the name of a symbolic
- * font into UTF-8 is macRoman, while the desired encoding to use
- * to convert bytes in a symbolic font to UTF-8 is the corresponding
- * symbolic encoding. Due to this dual interpretatation of symbolic
- * fonts, the caller can specify what type of encoding to return
- * should the specified font be symbolic.
- *
- * Results:
- * The return value is a string that specifies the font's encoding.
- * If the font's encoding could not be identified, NULL is returned.
- *
- * Side effects:
- * None.
- *
- *------------------------------------------------------------------------
- */
- static Tcl_Encoding
- GetFontEncoding(
- int faceNum, /* Macintosh font number. */
- int allowSymbol, /* If non-zero, then the encoding string
- * for symbol fonts will be the corresponding
- * symbol encoding. Otherwise, the encoding
- * string for symbol fonts will be
- * "macRoman". */
- int *isSymbolPtr) /* Filled with non-zero if this font is a
- * symbol font, 0 otherwise. */
- {
- Str255 faceName;
- int script, lang;
- char *name;
- if (allowSymbol != 0) {
- GetFontName(faceNum, faceName);
- if (pstrcasecmp(faceName, "psymbol") == 0) {
- *isSymbolPtr = 1;
- return Tcl_GetEncoding(NULL, "symbol");
- }
- if (pstrcasecmp(faceName, "pzapf dingbats") == 0) {
- *isSymbolPtr = 1;
- return Tcl_GetEncoding(NULL, "macDingbats");
- }
- }
- *isSymbolPtr = 0;
- script = FontToScript(faceNum);
- lang = GetScriptVariable(script, smScriptLang);
- name = NULL;
- if (script == smRoman) {
- name = TkFindStateString(romanMap, lang);
- } else if (script == smCyrillic) {
- name = TkFindStateString(cyrillicMap, lang);
- }
- if (name == NULL) {
- name = TkFindStateString(scriptMap, script);
- }
- return Tcl_GetEncoding(NULL, name);
- }
- /*
- *----------------------------------------------------------------------
- *
- * TkMacOSXInitControlFontStyle --
- *
- * This procedure sets up the appropriate ControlFontStyleRec
- * for a Mac control.
- *
- * Results:
- * None.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- void
- TkMacOSXInitControlFontStyle(
- Tk_Font tkfont,
- ControlFontStylePtr fsPtr)
- {
- MacFont *fontPtr = (MacFont *) tkfont;
- FontFamily *lastFamilyPtr = fontPtr->subFontArray[0].familyPtr;
- fsPtr->flags = kControlUseFontMask | kControlUseSizeMask |
- kControlUseFaceMask | kControlUseJustMask;
- fsPtr->font = lastFamilyPtr->faceNum;
- fsPtr->size = fontPtr->size;
- fsPtr->style = fontPtr->style;
- fsPtr->just = teCenter;
- }
- /*
- *----------------------------------------------------------------------
- *
- * TkMacOSXUseAntialiasedText --
- *
- * Enables or disables application-wide use of quickdraw
- * antialiased text (where available).
- * Sets up a linked tcl global boolean variable with write trace
- * to allow disabling of antialiased text from tcl.
- *
- * Results:
- * TCL_OK if facility was sucessfully enabled/disabled.
- * TCL_ERROR if an error occurred or if facility is not available.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
- static int TkMacOSXAntialiasedTextEnabled = FALSE;
- static char *
- TkMacOSXAntialiasedTextVariableProc(
- ClientData clientData,
- Tcl_Interp *interp,
- const char *name1,
- const char *name2,
- int flags)
- {
- TkMacOSXUseAntialiasedText(interp, TkMacOSXAntialiasedTextEnabled);
- return (char *) NULL;
- }
- int
- TkMacOSXUseAntialiasedText(
- Tcl_Interp *interp,
- int enable)
- {
- static Boolean initialized = FALSE;
- static UInt32 (*swaptextflags)(UInt32) = NULL;
- if(!initialized) {
- swaptextflags = TkMacOSXGetNamedSymbol("QD", "_QDSwapTextFlags");
- if (!swaptextflags) {
- swaptextflags = TkMacOSXGetNamedSymbol("QD", "_SwapQDTextFlags");
- }
- initialized = TRUE;
- TkMacOSXAntialiasedTextEnabled = (swaptextflags ? enable : FALSE);
- if (Tcl_CreateNamespace(interp, "::tk::mac", NULL, NULL) == NULL) {
- Tcl_ResetResult(interp);
- }
- if (Tcl_TraceVar(interp, "::tk::mac::antialiasedtext",
- TCL_GLOBAL_ONLY | TCL_TRACE_WRITES,
- TkMacOSXAntialiasedTextVariableProc, NULL) != TCL_OK) {
- Tcl_ResetResult(interp);
- }
- if (Tcl_LinkVar(interp, "::tk::mac::antialiasedtext",
- (char *) &TkMacOSXAntialiasedTextEnabled,
- TCL_LINK_BOOLEAN) != TCL_OK) {
- Tcl_ResetResult(interp);
- }
- }
- if (swaptextflags) {
- swaptextflags(enable ? kQDUseCGTextRendering | kQDUseCGTextMetrics
- : kQDUseTrueTypeScalerGlyphs);
- TkMacOSXAntialiasedTextEnabled = enable;
- return TCL_OK;
- } else {
- TkMacOSXAntialiasedTextEnabled = FALSE;
- return TCL_ERROR;
- }
- }