/* * tkMacOSXFont.c -- * * Contains the Macintosh implementation of the platform-independent font * package interface. * * Copyright 2002-2004 Benjamin Riefenstahl, Benjamin.Riefenstahl@epost.de * Copyright (c) 2006-2009 Daniel A. Steffen * Copyright 2008-2009, Apple Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. */ #include "tkMacOSXPrivate.h" #include "tkMacOSXFont.h" #include "tkMacOSXConstants.h" #define defaultOrientation kCTFontDefaultOrientation #define verticalOrientation kCTFontVerticalOrientation #define fixedPitch kCTFontUserFixedPitchFontType /* #ifdef TK_MAC_DEBUG #define TK_MAC_DEBUG_FONTS #endif */ /* * The following structure represents our Macintosh-specific implementation * of a font object. */ typedef struct { TkFont font; /* Stuff used by generic font package. Must be * first in structure. */ NSFont *nsFont; NSDictionary *nsAttributes; } MacFont; /* * The names for our "native" fonts. */ #define SYSTEMFONT_NAME "system" #define APPLFONT_NAME "application" #define MENUITEMFONT_NAME "menu" struct SystemFontMapEntry { const ThemeFontID id; const char *systemName; const char *tkName; const char *tkName1; }; #define ThemeFont(n, ...) { kTheme##n##Font, "system" #n "Font", ##__VA_ARGS__ } static const struct SystemFontMapEntry systemFontMap[] = { ThemeFont(System, "TkDefaultFont", "TkIconFont"), ThemeFont(EmphasizedSystem, "TkCaptionFont"), ThemeFont(SmallSystem, "TkHeadingFont", "TkTooltipFont"), ThemeFont(SmallEmphasizedSystem), ThemeFont(Application, "TkTextFont"), ThemeFont(Label, "TkSmallCaptionFont"), ThemeFont(Views), ThemeFont(MenuTitle), ThemeFont(MenuItem, "TkMenuFont"), ThemeFont(MenuItemMark), ThemeFont(MenuItemCmdKey), ThemeFont(WindowTitle), ThemeFont(PushButton), ThemeFont(UtilityWindowTitle), ThemeFont(AlertHeader), ThemeFont(Toolbar), ThemeFont(MiniSystem), { kThemeSystemFontDetail, "systemDetailSystemFont" }, { kThemeSystemFontDetailEmphasized, "systemDetailEmphasizedSystemFont" }, { -1, NULL } }; #undef ThemeFont static int antialiasedTextEnabled = -1; static NSCharacterSet *whitespaceCharacterSet = nil; static NSCharacterSet *lineendingCharacterSet = nil; static void GetTkFontAttributesForNSFont(NSFont *nsFont, TkFontAttributes *faPtr); static NSFont * FindNSFont(const char *familyName, NSFontTraitMask traits, NSInteger weight, CGFloat size, int fallbackToDefault); static void InitFont(NSFont *nsFont, const TkFontAttributes *reqFaPtr, MacFont *fontPtr); static int CreateNamedSystemFont(Tcl_Interp *interp, Tk_Window tkwin, const char *name, TkFontAttributes *faPtr); static void DrawCharsInContext(Display *display, Drawable drawable, GC gc, Tk_Font tkfont, const char *source, int numBytes, int rangeStart, int rangeLength, int x, int y, double angle); #pragma mark - #pragma mark Font Helpers: /* * To avoid an extra copy, a TKNSString object wraps a Tcl_DString with an * NSString that uses the DString's buffer as its character buffer. */ @implementation TKNSString - (instancetype)initWithTclUtfBytes:(const void *)bytes length:(NSUInteger)len { if (self = [self init]) { Tcl_DStringInit(&_ds); Tcl_UtfToUniCharDString(bytes, len, &_ds); _string = [[NSString alloc] initWithCharactersNoCopy:(unichar *)Tcl_DStringValue(&_ds) length:Tcl_DStringLength(&_ds)>>1 freeWhenDone:NO]; self.UTF8String = _string.UTF8String; } return self; } - (void)dealloc { Tcl_DStringFree(&_ds); [_string release]; [super dealloc]; } - (NSUInteger)length { return _string.length; } - (unichar)characterAtIndex:(NSUInteger)index { return [_string characterAtIndex:index]; } @end /* *--------------------------------------------------------------------------- * * TkUtfAtIndex -- * * Write a sequence of bytes up to length 6 which is an encoding of a UTF-16 * character in an NSString. Also record the unicode code point of the character. * this may be a non-BMP character constructed by reading two surrogates from * the NSString. See the documentation for TKNSString in tkMacOSXPrivate.h. * * Results: * Returns the number of bytes written. * * Side effects: * Bytes are written to the char array referenced by the pointer uni and * the unicode code point is written to the integer referenced by the * pointer code. * */ MODULE_SCOPE int TkUtfAtIndex( NSString *string, int index, char *uni, unsigned int *code) { char *ptr = uni; UniChar uniChar = [string characterAtIndex: index]; if (CFStringIsSurrogateHighCharacter(uniChar)) { UniChar lowChar = [string characterAtIndex: ++index]; *code = CFStringGetLongCharacterForSurrogatePair( uniChar, lowChar); ptr += Tcl_UniCharToUtf(uniChar, ptr); ptr += Tcl_UniCharToUtf(lowChar, ptr); return ptr - uni; } else { *code = (int) uniChar; [[string substringWithRange: NSMakeRange(index, 1)] getCString: uni maxLength: XMaxTransChars encoding: NSUTF8StringEncoding]; return strlen(uni); } } /* *--------------------------------------------------------------------------- * * TkNSStringToUtf -- * * Encodes the unicode string represented by an NSString object with the * internal encoding that Tcl uses when TCL_UTF_MAX = 3. This encoding * is similar to UTF-8 except that non-BMP characters are encoded as two * successive 3-byte sequences which are constructed from UTF-16 surrogates * by applying the UTF-8 algorithm. Even though the UTF-8 encoding does not * allow encoding surrogates, the algorithm does produce a well-defined * 3-byte sequence. * * Results: * Returns a pointer to a null-terminated byte array which encodes the * NSString. * * Side effects: * Memory is allocated to hold the byte array, which must be freed with * ckalloc. If the pointer numBytes is not NULL the number of non-null * bytes written to the array is stored in the integer it references. */ MODULE_SCOPE char* TkNSStringToUtf( NSString *string, int *numBytes) { unsigned int code; int i; char *ptr, *bytes = ckalloc(6*[string length] + 1); ptr = bytes; if (ptr) { for (i = 0; i < [string length]; i++) { ptr += TkUtfAtIndex(string, i, ptr, &code); if (code > 0xffff){ i++; } } *ptr = '\0'; } if (numBytes) { *numBytes = ptr - bytes; } return bytes; } #define GetNSFontTraitsFromTkFontAttributes(faPtr) \ ((faPtr)->weight == TK_FW_BOLD ? NSBoldFontMask : NSUnboldFontMask) | \ ((faPtr)->slant == TK_FS_ITALIC ? NSItalicFontMask : NSUnitalicFontMask) /* *--------------------------------------------------------------------------- * * GetTkFontAttributesForNSFont -- * * Fill in TkFontAttributes for given NSFont. * * Results: * None. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static void GetTkFontAttributesForNSFont( NSFont *nsFont, TkFontAttributes *faPtr) { NSFontTraitMask traits = [[NSFontManager sharedFontManager] traitsOfFont:nsFont]; faPtr->family = Tk_GetUid([[nsFont familyName] UTF8String]); faPtr->size = [nsFont pointSize]; faPtr->weight = (traits & NSBoldFontMask ? TK_FW_BOLD : TK_FW_NORMAL); faPtr->slant = (traits & NSItalicFontMask ? TK_FS_ITALIC : TK_FS_ROMAN); } /* *--------------------------------------------------------------------------- * * FindNSFont -- * * Find NSFont for given attributes. Use default values for missing * attributes, and do a case-insensitive search for font family names * if necessary. If fallbackToDefault flag is set, use the system font * as a last resort. * * Results: * None. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static NSFont * FindNSFont( const char *familyName, NSFontTraitMask traits, NSInteger weight, CGFloat size, int fallbackToDefault) { NSFontManager *fm = [NSFontManager sharedFontManager]; NSFont *nsFont, *dflt = nil; #define defaultFont (dflt ? dflt : (dflt = [NSFont systemFontOfSize:0])) NSString *family; if (familyName) { family = [[[NSString alloc] initWithUTF8String:familyName] autorelease]; } else { family = [defaultFont familyName]; } if (size == 0.0) { size = [defaultFont pointSize]; } nsFont = [fm fontWithFamily:family traits:traits weight:weight size:size]; /* * A second bug in NSFontManager that Apple created for the Catalina OS * causes requests as above to sometimes return fonts with additional * traits that were not requested, even though fonts without those unwanted * traits exist on the system. See bug [90d555e088]. As a workaround * we ask the font manager to remove any unrequested traits. */ if (nsFont) { nsFont = [fm convertFont:nsFont toNotHaveTrait:~traits]; } if (!nsFont) { NSArray *availableFamilies = [fm availableFontFamilies]; NSString *caseFamily = nil; for (NSString *f in availableFamilies) { if ([family caseInsensitiveCompare:f] == NSOrderedSame) { caseFamily = f; break; } } if (caseFamily) { nsFont = [fm fontWithFamily:caseFamily traits:traits weight:weight size:size]; } } if (!nsFont) { nsFont = [NSFont fontWithName:family size:size]; } if (!nsFont && fallbackToDefault) { nsFont = [fm convertFont:defaultFont toFamily:family]; nsFont = [fm convertFont:nsFont toSize:size]; nsFont = [fm convertFont:nsFont toHaveTrait:traits]; } [nsFont retain]; #undef defaultFont return nsFont; } /* *--------------------------------------------------------------------------- * * InitFont -- * * Helper for TkpGetNativeFont() and TkpGetFontFromAttributes(). * * Results: * Fills the MacFont structure. * * Side effects: * Memory allocated. * *--------------------------------------------------------------------------- */ static void InitFont( NSFont *nsFont, const TkFontAttributes *reqFaPtr, /* Can be NULL */ MacFont *fontPtr) { TkFontAttributes *faPtr; TkFontMetrics *fmPtr; NSDictionary *nsAttributes; NSRect bounds; CGFloat kern = 0.0; NSFontRenderingMode renderingMode = NSFontDefaultRenderingMode; int ascent, descent/*, dontAA*/; static const UniChar ch[] = {'.', 'W', ' ', 0xc4, 0xc1, 0xc2, 0xc3, 0xc7}; /* ., W, Space, Auml, Aacute, Acirc, Atilde, Ccedilla */ #define nCh (sizeof(ch) / sizeof(UniChar)) CGGlyph glyphs[nCh]; CGRect boundingRects[nCh]; fontPtr->font.fid = (Font) fontPtr; faPtr = &fontPtr->font.fa; if (reqFaPtr) { *faPtr = *reqFaPtr; } else { TkInitFontAttributes(faPtr); } fontPtr->nsFont = nsFont; /* * Some don't like antialiasing on fixed-width even if bigger than limit */ // dontAA = [nsFont isFixedPitch] && fontPtr->font.fa.size <= 10; if (antialiasedTextEnabled >= 0/* || dontAA*/) { renderingMode = (antialiasedTextEnabled == 0/* || dontAA*/) ? NSFontIntegerAdvancementsRenderingMode : NSFontAntialiasedRenderingMode; } nsFont = [nsFont screenFontWithRenderingMode:renderingMode]; GetTkFontAttributesForNSFont(nsFont, faPtr); fmPtr = &fontPtr->font.fm; fmPtr->ascent = floor([nsFont ascender] + [nsFont leading] + 0.5); fmPtr->descent = floor(-[nsFont descender] + 0.5); fmPtr->maxWidth = [nsFont maximumAdvancement].width; fmPtr->fixed = [nsFont isFixedPitch]; /* Does not work for all fonts */ /* * The ascent, descent and fixed fields are not correct for all fonts, as * a workaround deduce that info from the metrics of some typical glyphs, * along with screenfont kerning (space advance difference to printer font) */ bounds = [nsFont boundingRectForFont]; if (CTFontGetGlyphsForCharacters((CTFontRef) nsFont, ch, glyphs, nCh)) { fmPtr->fixed = [nsFont advancementForGlyph:glyphs[0]].width == [nsFont advancementForGlyph:glyphs[1]].width; bounds = NSRectFromCGRect(CTFontGetBoundingRectsForGlyphs((CTFontRef) nsFont, defaultOrientation, ch, boundingRects, nCh)); kern = [nsFont advancementForGlyph:glyphs[2]].width - [fontPtr->nsFont advancementForGlyph:glyphs[2]].width; } descent = floor(-bounds.origin.y + 0.5); ascent = floor(bounds.size.height + bounds.origin.y + 0.5); if (ascent > fmPtr->ascent) { fmPtr->ascent = ascent; } if (descent > fmPtr->descent) { fmPtr->descent = descent; } nsAttributes = [NSDictionary dictionaryWithObjectsAndKeys: nsFont, NSFontAttributeName, [NSNumber numberWithInt:faPtr->underline ? NSUnderlineStyleSingle|NSUnderlinePatternSolid : NSUnderlineStyleNone], NSUnderlineStyleAttributeName, [NSNumber numberWithInt:faPtr->overstrike ? NSUnderlineStyleSingle|NSUnderlinePatternSolid : NSUnderlineStyleNone], NSStrikethroughStyleAttributeName, [NSNumber numberWithInt:fmPtr->fixed ? 0 : 1], NSLigatureAttributeName, [NSNumber numberWithDouble:kern], NSKernAttributeName, nil]; fontPtr->nsAttributes = [nsAttributes retain]; #undef nCh } /* *------------------------------------------------------------------------- * * CreateNamedSystemFont -- * * Register a system font with the Tk named font mechanism. * * Results: * * Result from TkCreateNamedFont(). * * Side effects: * * A new named font is added to the Tk font registry. * *------------------------------------------------------------------------- */ static int CreateNamedSystemFont( Tcl_Interp *interp, Tk_Window tkwin, const char* name, TkFontAttributes *faPtr) { TkDeleteNamedFont(NULL, tkwin, name); return TkCreateNamedFont(interp, tkwin, name, faPtr); } #pragma mark - #pragma mark Font handling: /* *------------------------------------------------------------------------- * * 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. * Note that this is called before TkpInit() ! * * Results: * None. * * Side effects: * Initialize named system fonts. * *------------------------------------------------------------------------- */ void TkpFontPkgInit( TkMainInfo *mainPtr) /* The application being created. */ { Tcl_Interp *interp = mainPtr->interp; Tk_Window tkwin = (Tk_Window) mainPtr->winPtr; const struct SystemFontMapEntry *systemFont = systemFontMap; NSFont *nsFont; TkFontAttributes fa; NSMutableCharacterSet *cs; /* * Since we called before TkpInit, we need our own autorelease pool. */ NSAutoreleasePool *pool = [NSAutoreleasePool new]; /* * Force this for now. */ if (!mainPtr->winPtr->mainPtr) { mainPtr->winPtr->mainPtr = mainPtr; } while (systemFont->systemName) { nsFont = (NSFont*) CTFontCreateUIFontForLanguage( HIThemeGetUIFontType(systemFont->id), 0, NULL); if (nsFont) { TkInitFontAttributes(&fa); GetTkFontAttributesForNSFont(nsFont, &fa); CreateNamedSystemFont(interp, tkwin, systemFont->systemName, &fa); if (systemFont->tkName) { CreateNamedSystemFont(interp, tkwin, systemFont->tkName, &fa); } if (systemFont->tkName1) { CreateNamedSystemFont(interp, tkwin, systemFont->tkName1, &fa); } CFRelease(nsFont); } systemFont++; } TkInitFontAttributes(&fa); #if 0 /* * In macOS 10.15.1 Apple introduced a bug in NSFontManager which caused * it to not recognize the familyName ".SF NSMono" which is the familyName * of the default fixed pitch system fault on that system. See bug [855049e799]. * As a workaround we call [NSFont userFixedPitchFontOfSize:11] instead. * This returns a user font in the "Menlo" family. */ nsFont = (NSFont*) CTFontCreateUIFontForLanguage(fixedPitch, 11, NULL); #else nsFont = [NSFont userFixedPitchFontOfSize:11]; #endif if (nsFont) { GetTkFontAttributesForNSFont(nsFont, &fa); #if 0 CFRelease(nsFont); #endif } else { fa.family = Tk_GetUid("Monaco"); fa.size = 11; fa.weight = TK_FW_NORMAL; fa.slant = TK_FS_ROMAN; } CreateNamedSystemFont(interp, tkwin, "TkFixedFont", &fa); if (!whitespaceCharacterSet) { whitespaceCharacterSet = [[NSCharacterSet whitespaceAndNewlineCharacterSet] retain]; cs = [whitespaceCharacterSet mutableCopy]; [cs removeCharactersInString:@" "]; lineendingCharacterSet = [cs copy]; [cs release]; } [pool drain]; } /* *--------------------------------------------------------------------------- * * 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. */ { MacFont *fontPtr = NULL; ThemeFontID themeFontId; CTFontRef ctFont; 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; } ctFont = CTFontCreateUIFontForLanguage( HIThemeGetUIFontType(themeFontId), 0, NULL); if (ctFont) { fontPtr = ckalloc(sizeof(MacFont)); InitFont((NSFont*) ctFont, NULL, 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. */ { MacFont *fontPtr; int points = (int) (TkFontGetPoints(tkwin, faPtr->size) + 0.5); NSFontTraitMask traits = GetNSFontTraitsFromTkFontAttributes(faPtr); NSInteger weight = (faPtr->weight == TK_FW_BOLD ? 9 : 5); NSFont *nsFont; nsFont = FindNSFont(faPtr->family, traits, weight, points, 0); if (!nsFont) { const char *const *aliases = TkFontGetAliasList(faPtr->family); while (aliases && !nsFont) { nsFont = FindNSFont(*aliases++, traits, weight, points, 0); } } if (!nsFont) { nsFont = FindNSFont(faPtr->family, traits, weight, points, 1); } if (!nsFont) { Tcl_Panic("Could not determine NSFont from TkFontAttributes"); } if (tkFontPtr == NULL) { fontPtr = ckalloc(sizeof(MacFont)); } else { fontPtr = (MacFont *) tkFontPtr; TkpDeleteFont(tkFontPtr); } CFRetain(nsFont); /* Always needed to allow unconditional CFRelease below */ InitFont(nsFont, faPtr, 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. */ { MacFont *fontPtr = (MacFont *) tkFontPtr; [fontPtr->nsAttributes release]; fontPtr->nsAttributes = NULL; CFRelease(fontPtr->nsFont); /* Either a CTFontRef or a CFRetained NSFont */ } /* *--------------------------------------------------------------------------- * * 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. */ { Tcl_Obj *resultPtr = Tcl_NewListObj(0, NULL); NSArray *list = [[NSFontManager sharedFontManager] availableFontFamilies]; for (NSString *family in list) { Tcl_ListObjAppendElement(NULL, resultPtr, Tcl_NewStringObj([family UTF8String], -1)); } Tcl_SetObjResult(interp, resultPtr); } /* *------------------------------------------------------------------------- * * 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. */ { MacFont *fontPtr = (MacFont *) tkfont; Tcl_Obj *resultPtr = Tcl_NewListObj(0, NULL); if (fontPtr->nsFont) { NSArray *list = [[fontPtr->nsFont fontDescriptor] objectForKey:NSFontCascadeListAttribute]; for (NSFontDescriptor *subFontDesc in list) { NSString *family = [subFontDesc objectForKey:NSFontFamilyAttribute]; if (family) { Tcl_ListObjAppendElement(NULL, resultPtr, Tcl_NewStringObj([family UTF8String], -1)); } } } Tcl_SetObjResult(interp, resultPtr); } /* *---------------------------------------------------------------------- * * TkpGetFontAttrsForChar -- * * Retrieve the font attributes of the actual font used to render a given * character. * * Results: * None. * * Side effects: * The font attributes are stored in *faPtr. * *---------------------------------------------------------------------- */ void TkpGetFontAttrsForChar( Tk_Window tkwin, /* Window on the font's display */ Tk_Font tkfont, /* Font to query */ int c, /* Character of interest */ TkFontAttributes* faPtr) /* Output: Font attributes */ { MacFont *fontPtr = (MacFont *) tkfont; NSFont *nsFont = fontPtr->nsFont; *faPtr = fontPtr->font.fa; if (nsFont && ![[nsFont coveredCharacterSet] characterIsMember:c]) { UTF16Char ch = (UTF16Char) c; nsFont = [nsFont bestMatchingFontForCharacters:&ch length:1 attributes:nil actualCoveredLength:NULL]; if (nsFont) { GetTkFontAttributesForNSFont(nsFont, faPtr); } } } #pragma mark - #pragma mark Measuring and drawing: /* *--------------------------------------------------------------------------- * * 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. * * With ATSUI we need the line context to do this right, so we have the * actual implementation in TkpMeasureCharsInContext(). * * 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. * * Todo: * Effects of the "flags" parameter are untested. * *--------------------------------------------------------------------------- */ 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 * '\0' 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. */ { return TkpMeasureCharsInContext(tkfont, source, numBytes, 0, numBytes, maxLength, flags, lengthPtr); } /* *--------------------------------------------------------------------------- * * TkpMeasureCharsInContext -- * * Determine the number of bytes from the string that will fit in the * given horizontal span. The measurement is done under the assumption * that TkpDrawCharsInContext() will be used to actually display the * characters. * * This one is almost the same as Tk_MeasureChars(), but with access to * all the characters on the line for context. * * 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 TkpMeasureCharsInContext( Tk_Font tkfont, /* Font in which characters will be drawn. */ const char * source, /* UTF-8 string to be displayed. Need not be * '\0' terminated. */ int numBytes, /* Maximum number of bytes to consider from * source string in all. */ int rangeStart, /* Index of first byte to measure. */ int rangeLength, /* Length of range to measure in bytes. */ 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 fits 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. If TK_WHOLE_WORDS and * TK_AT_LEAST_ONE are set and the first word * doesn't fit, we return at least one * character or whatever characters fit into * maxLength. TK_ISOLATE_END means that the * last character should not be considered in * context with the rest of the string (used * for breaking lines). */ int *lengthPtr) /* Filled with x-location just after the * terminating character. */ { const MacFont *fontPtr = (const MacFont *) tkfont; NSString *string; NSAttributedString *attributedString; CTTypesetterRef typesetter; CFIndex start, len; CFRange range = {0, 0}; CTLineRef line; CGFloat offset = 0; CFIndex index; double width; int length, fit; if (rangeStart < 0 || rangeLength <= 0 || rangeStart + rangeLength > numBytes || (maxLength == 0 && !(flags & TK_AT_LEAST_ONE))) { *lengthPtr = 0; return 0; } if (maxLength > 32767) { maxLength = 32767; } string = [[TKNSString alloc] initWithTclUtfBytes:source length:numBytes]; if (!string) { length = 0; fit = rangeLength; goto done; } attributedString = [[NSAttributedString alloc] initWithString:string attributes:fontPtr->nsAttributes]; typesetter = CTTypesetterCreateWithAttributedString( (CFAttributedStringRef)attributedString); start = Tcl_NumUtfChars(source, rangeStart); len = Tcl_NumUtfChars(source + rangeStart, rangeLength); if (start > 0) { range.length = start; line = CTTypesetterCreateLine(typesetter, range); offset = CTLineGetTypographicBounds(line, NULL, NULL, NULL); CFRelease(line); } if (maxLength < 0) { index = len; range.length = len; line = CTTypesetterCreateLine(typesetter, range); width = CTLineGetTypographicBounds(line, NULL, NULL, NULL); CFRelease(line); } else { double maxWidth = maxLength + offset; NSCharacterSet *cs; /* * Get a line breakpoint in the source string. */ index = start; if (flags & TK_WHOLE_WORDS) { index = CTTypesetterSuggestLineBreak(typesetter, start, maxWidth); if (index <= start && (flags & TK_AT_LEAST_ONE)) { flags &= ~TK_WHOLE_WORDS; } } if (index <= start && !(flags & TK_WHOLE_WORDS)) { index = CTTypesetterSuggestClusterBreak(typesetter, start, maxWidth); } /* * Trim right whitespace/lineending characters. */ cs = (index <= len && (flags & TK_WHOLE_WORDS)) ? whitespaceCharacterSet : lineendingCharacterSet; while (index > start && [cs characterIsMember:[string characterAtIndex:(index - 1)]]) { index--; } /* * If there is no line breakpoint in the source string between its * start and the index position that fits in maxWidth, then * CTTypesetterSuggestLineBreak() returns that very last index. * However if the TK_WHOLE_WORDS flag is set, we want to break at a * word boundary. In this situation, unless TK_AT_LEAST_ONE is set, we * must report that zero chars actually fit (in other words the * smallest word of the source string is still larger than maxWidth). */ if ((index >= start) && (index < len) && (flags & TK_WHOLE_WORDS) && !(flags & TK_AT_LEAST_ONE) && ![cs characterIsMember:[string characterAtIndex:index]]) { index = start; } if (index <= start && (flags & TK_AT_LEAST_ONE)) { index = start + 1; } /* * Now measure the string width in pixels. */ if (index > 0) { range.length = index; line = CTTypesetterCreateLine(typesetter, range); width = CTLineGetTypographicBounds(line, NULL, NULL, NULL); CFRelease(line); } else { width = 0; } if (width < maxWidth && (flags & TK_PARTIAL_OK) && index < len) { range.length = ++index; line = CTTypesetterCreateLine(typesetter, range); width = CTLineGetTypographicBounds(line, NULL, NULL, NULL); CFRelease(line); } /* * The call to CTTypesetterSuggestClusterBreak above will always return * at least one character regardless of whether it exceeded it or not. * Clean that up now. */ while (width > maxWidth && !(flags & TK_PARTIAL_OK) && index > start+(flags & TK_AT_LEAST_ONE)) { range.length = --index; line = CTTypesetterCreateLine(typesetter, range); width = CTLineGetTypographicBounds(line, NULL, NULL, NULL); CFRelease(line); } } CFRelease(typesetter); [attributedString release]; [string release]; length = ceil(width - offset); fit = (Tcl_UtfAtIndex(source, index) - source) - rangeStart; done: #ifdef TK_MAC_DEBUG_FONTS TkMacOSXDbgMsg("measure: source=\"%s\" range=\"%.*s\" maxLength=%d " "flags='%s%s%s%s' -> width=%d bytesFit=%d\n", source, rangeLength, source+rangeStart, maxLength, flags & TK_PARTIAL_OK ? "partialOk " : "", flags & TK_WHOLE_WORDS ? "wholeWords " : "", flags & TK_AT_LEAST_ONE ? "atLeastOne " : "", flags & TK_ISOLATE_END ? "isolateEnd " : "", length, fit); #endif *lengthPtr = length; return fit; } /* *--------------------------------------------------------------------------- * * Tk_DrawChars -- * * Draw a string of characters on the screen. * * With ATSUI we need the line context to do this right, so we have the * actual implementation in TkpDrawCharsInContext(). * * 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 * '\0' 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. */ { DrawCharsInContext(display, drawable, gc, tkfont, source, numBytes, 0, numBytes, x, y, 0.0); } void TkDrawAngledChars( 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 * '\0' 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. */ double x, double y, /* Coordinates at which to place origin of * string when drawing. */ double angle) /* What angle to put text at, in degrees. */ { DrawCharsInContext(display, drawable, gc, tkfont, source, numBytes, 0, numBytes, x, y, angle); } /* *--------------------------------------------------------------------------- * * TkpDrawCharsInContext -- * * Draw a string of characters on the screen like Tk_DrawChars(), with * access to all the characters on the line for context. * * Results: * None. * * Side effects: * Information gets drawn on the screen. * * Todo: * Stippled text drawing. * *--------------------------------------------------------------------------- */ void TkpDrawCharsInContext( 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 * '\0' 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 rangeStart, /* Index of first byte to draw. */ int rangeLength, /* Length of range to draw in bytes. */ int x, int y) /* Coordinates at which to place origin of the * whole (not just the range) string when * drawing. */ { DrawCharsInContext(display, drawable, gc, tkfont, source, numBytes, rangeStart, rangeLength, x, y, 0.0); } static void DrawCharsInContext( 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 * '\0' 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 rangeStart, /* Index of first byte to draw. */ int rangeLength, /* Length of range to draw in bytes. */ int x, int y, /* Coordinates at which to place origin of the * whole (not just the range) string when * drawing. */ double angle) { const MacFont *fontPtr = (const MacFont *) tkfont; NSString *string; NSMutableDictionary *attributes; NSAttributedString *attributedString; CTTypesetterRef typesetter; CFIndex start, length; CTLineRef line, full=nil; MacDrawable *macWin = (MacDrawable *) drawable; TkMacOSXDrawingContext drawingContext; CGContextRef context; CGColorRef fg; NSFont *nsFont; CGAffineTransform t; CGFloat width, height, textX = (CGFloat) x, textY = (CGFloat) y; if (rangeStart < 0 || rangeLength <= 0 || rangeStart + rangeLength > numBytes || !TkMacOSXSetupDrawingContext(drawable, gc, 1, &drawingContext)) { return; } string = [[TKNSString alloc] initWithTclUtfBytes:source length:numBytes]; if (!string) { return; } context = drawingContext.context; fg = TkMacOSXCreateCGColor(gc, gc->foreground); attributes = [fontPtr->nsAttributes mutableCopy]; [attributes setObject:(id)fg forKey:(id)kCTForegroundColorAttributeName]; CFRelease(fg); nsFont = [attributes objectForKey:NSFontAttributeName]; [nsFont setInContext:[NSGraphicsContext graphicsContextWithGraphicsPort: context flipped:NO]]; CGContextSetTextMatrix(context, CGAffineTransformIdentity); attributedString = [[NSAttributedString alloc] initWithString:string attributes:attributes]; typesetter = CTTypesetterCreateWithAttributedString( (CFAttributedStringRef)attributedString); textX += (CGFloat) macWin->xOff; textY += (CGFloat) macWin->yOff; height = drawingContext.portBounds.size.height; textY = height - textY; t = CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0, height); if (angle != 0.0) { t = CGAffineTransformTranslate( CGAffineTransformRotate( CGAffineTransformTranslate(t, textX, textY), angle*PI/180.0), -textX, -textY); } CGContextConcatCTM(context, t); start = Tcl_NumUtfChars(source, rangeStart); length = Tcl_NumUtfChars(source, rangeStart + rangeLength) - start; line = CTTypesetterCreateLine(typesetter, CFRangeMake(start, length)); if (start > 0) { /* * We are only drawing part of the string. To compute the x coordinate * of the part we are drawing we subtract its typographical length from * the typographical length of the full string. This accounts for the * kerning after the initial part of the string. */ full = CTTypesetterCreateLine(typesetter, CFRangeMake(0, start + length)); width = CTLineGetTypographicBounds(full, NULL, NULL, NULL); CFRelease(full); textX += (width - CTLineGetTypographicBounds(line, NULL, NULL, NULL)); } CGContextSetTextPosition(context, textX, textY); CTLineDraw(line, context); CFRelease(line); CFRelease(typesetter); [attributedString release]; [string release]; [attributes release]; TkMacOSXRestoreDrawingContext(&drawingContext); } #pragma mark - #pragma mark Accessors: /* *--------------------------------------------------------------------------- * * TkMacOSXNSFontForFont -- * * Return an NSFont for the given Tk_Font. * * Results: * NSFont*. * * Side effects: * None. * *--------------------------------------------------------------------------- */ MODULE_SCOPE NSFont* TkMacOSXNSFontForFont( Tk_Font tkfont) { return tkfont ? ((MacFont *)tkfont)->nsFont : nil; } /* *--------------------------------------------------------------------------- * * TkMacOSXNSFontAttributesForFont -- * * Return an NSDictionary of font attributes for the given Tk_Font. * * Results: * NSFont*. * * Side effects: * None. * *--------------------------------------------------------------------------- */ MODULE_SCOPE NSDictionary* TkMacOSXNSFontAttributesForFont( Tk_Font tkfont) { return tkfont ? ((MacFont *)tkfont)->nsAttributes : nil; } /* *--------------------------------------------------------------------------- * * TkMacOSXIsCharacterMissing -- * * Given a tkFont and a character determine whether the character has * a glyph defined in the font 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. */ { return 0; } /* *---------------------------------------------------------------------- * * TkMacOSXFontDescriptionForNSFontAndNSFontAttributes -- * * Get text description of a font specified by NSFont and attributes. * * Results: * List object or NULL. * * Side effects: * None. * *---------------------------------------------------------------------- */ MODULE_SCOPE Tcl_Obj * TkMacOSXFontDescriptionForNSFontAndNSFontAttributes( NSFont *nsFont, NSDictionary *nsAttributes) { Tcl_Obj *objv[6]; int i = 0; const char *familyName = [[nsFont familyName] UTF8String]; if (nsFont && familyName) { NSFontTraitMask traits = [[NSFontManager sharedFontManager] traitsOfFont:nsFont]; id underline = [nsAttributes objectForKey: NSUnderlineStyleAttributeName]; id strikethrough = [nsAttributes objectForKey: NSStrikethroughStyleAttributeName]; objv[i++] = Tcl_NewStringObj(familyName, -1); objv[i++] = Tcl_NewIntObj([nsFont pointSize]); #define S(s) Tcl_NewStringObj(STRINGIFY(s),(int)(sizeof(STRINGIFY(s))-1)) objv[i++] = (traits & NSBoldFontMask) ? S(bold) : S(normal); objv[i++] = (traits & NSItalicFontMask) ? S(italic) : S(roman); if ([underline respondsToSelector:@selector(intValue)] && ([underline intValue] & (NSUnderlineStyleSingle | NSUnderlineStyleThick | NSUnderlineStyleDouble))) { objv[i++] = S(underline); } if ([strikethrough respondsToSelector:@selector(intValue)] && ([strikethrough intValue] & (NSUnderlineStyleSingle | NSUnderlineStyleThick | NSUnderlineStyleDouble))) { objv[i++] = S(overstrike); } #undef S } return i ? Tcl_NewListObj(i, objv) : NULL; } /* *---------------------------------------------------------------------- * * TkMacOSXUseAntialiasedText -- * * Enables or disables application-wide use of antialiased text (where * available). Sets up a linked Tcl global variable to allow disabling of * antialiased text from Tcl. * * The possible values for this variable are: * * -1 - Use system default as configurable in "System Prefs" -> "General". * 0 - Unconditionally disable antialiasing. * 1 - Unconditionally enable antialiasing. * * Results: * * TCL_OK. * * Side effects: * * None. * *---------------------------------------------------------------------- */ MODULE_SCOPE int TkMacOSXUseAntialiasedText( Tcl_Interp * interp, /* The Tcl interpreter to receive the * variable.*/ int enable) /* Initial value. */ { static Boolean initialized = FALSE; if (!initialized) { initialized = TRUE; if (Tcl_CreateNamespace(interp, "::tk::mac", NULL, NULL) == NULL) { Tcl_ResetResult(interp); } if (Tcl_LinkVar(interp, "::tk::mac::antialiasedtext", (char *) &antialiasedTextEnabled, TCL_LINK_INT) != TCL_OK) { Tcl_ResetResult(interp); } } antialiasedTextEnabled = enable; return TCL_OK; } /* * Local Variables: * mode: objc * c-basic-offset: 4 * fill-column: 79 * coding: utf-8 * End: */