/* * tkMacOSXFont.c -- * * Contains the Macintosh implementation of the platform-independant * font package interface. This version uses ATSU instead of Quickdraw. * * Copyright 2002-2004 Benjamin Riefenstahl, Benjamin.Riefenstahl@epost.de * Copyright (c) 2006-2008 Daniel A. Steffen * * Some functions were originally copied verbatim from the QuickDraw version * of tkMacOSXFont.c, which had these copyright notices: * * Copyright (c) 1990-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright 2001, Apple Computer, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * Todos: * * - Get away from Font Manager and Quickdraw functions as much as possible, * replace with ATS functions instead. * * - Use Font Manager functions to translate ids from ATS to Font Manager * instead of just assuming that they are the same. * * - Get a second font register going for fonts that are not assigned to a * font family by the OS. On my system I have 27 fonts of that type, * Hebrew, Arabic and Hindi fonts that actually come with the system. * FMGetFontFamilyInstanceFromFont() returns -981 (kFMInvalidFontFamilyErr) * for these and they are not listed when enumerating families, but they * are when enumerating fonts directly. The problem that the OS sees may * be that at least some of them do not contain any Latin characters. Note * that such fonts can not be used for controls, because controls * definitely require a family id (this assertion needs testing). * * RCS: @(#) $Id: tkMacOSXFont.c,v 1.37.2.3 2008/08/19 00:19:10 das Exp $ */ #include "tkMacOSXPrivate.h" #include "tkMacOSXFont.h" /* #ifdef TK_MAC_DEBUG #define TK_MAC_DEBUG_FONTS #endif */ /* * Problem: The sum of two parts is not the same as the whole. In particular * the width of two separately measured strings will usually be larger than * the width of them pasted together. Tk has a design bug here, because it * generally assumes that this kind of arithmetic works. * To workaround this, #define TK_MAC_COALESCE_LINE to 1 below, we then avoid * lines that tremble and shiver while the cursor passes through them by * undercutting the system and behind the scenes pasting strings together that * look like they are on the same line and adjacent and that are drawn with * the same font. To do this we need some global data. */ #define TK_MAC_COALESCE_LINE 0 /* * 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. */ /* * The ATSU view of the font and other text properties. Used for drawing * and measuring. */ ATSUFontID atsuFontId; /* == FMFont. */ ATSUTextLayout atsuLayout; /* ATSU layout object, representing the whole * text that ATSU sees with some option * bits. */ ATSUStyle atsuStyle; /* ATSU style object, representing a run of * text with the same properties. */ /* * The QuickDraw view of the font. Used to configure controls. */ FMFontFamily qdFont; /* == FMFontFamilyId, Carbon replacement for * QD face numbers. */ short qdSize; /* Font size in points. */ short qdStyle; /* QuickDraw style bits. */ } MacFont; /* * Information about font families, initialized at startup time. Font * families are described by a mapping from UTF-8 names to MacOS font family * IDs. The whole list is kept as the sorted array "familyList", allocated * with ckrealloc(). * * Note: This would have been easier, if we could just have used Tcl hash * arrays. Unfortunately there seems to be no pre-packaged * non-case-sensitive version of that available. */ typedef struct { const char * name; FMFontFamily familyId; } MacFontFamily; static MacFontFamily * familyList = NULL; static int familyListNextFree = 0, /* The next free slot in familyList. */ familyListMaxValid = 0, /* The top of the sorted area. */ familyListSize = 0; /* The size of the whole array. */ /* * A simple one-shot sub-allocator for fast and efficient allocation of * strings. Used by the familyList array for the names. These strings are * only allocated once at startup and never freed. If you ever need to * re-initialize this, you can just ckfree() all the StringBlocks in the list * and start over. */ #define STRING_BLOCK_MAX (1024-8) /* Make sizeof(StringBlock) == * 1024. */ typedef struct StringBlock { struct StringBlock *next; /* Starting from "stringMemory" these * blocks form a linked list. */ int nextFree; /* Top of the used area in the * "strings" member. */ char strings[STRING_BLOCK_MAX]; /* The actual memory managed here. */ } StringBlock; static StringBlock *stringMemory = NULL; #if TK_MAC_COALESCE_LINE static Tcl_DString currentLine; /* The current line as seen so far. This * contains a Tcl_UniChar DString. */ static int currentY = -1, /* The Y position (row in pixels) of the * current line. */ currentLeft = -1, /* The left edge (pixels) of the current * line. */ currentRight = -1; /* The right edge (pixels) of the current * line. */ static const MacFont *currentFontPtr = NULL; /* The font of the current line. */ #endif /* TK_MAC_COALESCE_LINE */ static int antialiasedTextEnabled; /* * 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 /* * Procedures used only in this file. */ static void LayoutSetString(const MacFont *fontPtr, const TkMacOSXDrawingContext *drawingContextPtr, const UniChar * uchars, int ulen); /* * The actual workers. */ static int MeasureStringWidth(const MacFont *fontPtr, int start, int end); #if TK_MAC_COALESCE_LINE static const Tcl_UniChar *UpdateLineBuffer(const MacFont *fontPtr, const TkMacOSXDrawingContext *drawingContextPtr, const char *source, int numBytes, int x, int y, int * offset); #endif /* TK_MAC_COALESCE_LINE */ /* * Initialization and setup of a font data structure. */ static const char *FamilyNameForFamilyID(FMFontFamily familyId); static void InitFont(FMFontFamily familyId, const char *familyName, int size, int qdStyle, MacFont *fontPtr); static void InitATSUObjects(FMFontFamily familyId, short qdsize, short qdStyle, ATSUFontID *fontIdPtr, ATSUTextLayout *layoutPtr, ATSUStyle *stylePtr); static void InitATSUStyle(ATSUFontID fontId, short ptSize, short qdStyle, ATSUStyle style); static void SetFontFeatures(ATSUFontID fontId, int fixed, short size, ATSUStyle style); static void AdjustFontHeight(MacFont *fontPtr); static void InitATSULayout(const TkMacOSXDrawingContext *drawingContextPtr, ATSUTextLayout layout, int fixed); static void ReleaseFont(MacFont *fontPtr); /* * Finding fonts by name. */ static const MacFontFamily *FindFontFamilyOrAlias(const char *name); static const MacFontFamily *FindFontFamilyOrAliasOrFallback(const char *name); /* * Doing interesting things with font families and fonts. */ static void InitFontFamilies(void); static OSStatus GetFontFamilyName(FMFontFamily fontFamily, char *name, int numBytes); /* * Accessor functions and internal utilities for the font family list. */ static const MacFontFamily *AddFontFamily(const char *name, FMFontFamily familyId); static const MacFontFamily *FindFontFamily(const char *name); static Tcl_Obj *EnumFontFamilies(void); static OSStatus FontFamilyEnumCallback(ATSFontFamilyRef family, void *refCon); static void SortFontFamilies(void); static int CompareFontFamilies(const void *vp1, const void *vp2); static const char *AddString(const char *in); static OSStatus GetThemeFontAndFamily(const ThemeFontID themeFontId, FMFontFamily *fontFamily, unsigned char *fontName, SInt16 *fontSize, Style *fontStyle); static void InitSystemFonts(TkMainInfo *mainPtr); static int CreateNamedSystemFont(Tcl_Interp *interp, Tk_Window tkwin, const char* name, TkFontAttributes *faPtr); /* *------------------------------------------------------------------------- * * 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: * Initialization of variables local to this file. * *------------------------------------------------------------------------- */ void TkpFontPkgInit( TkMainInfo *mainPtr) /* The application being created. */ { InitFontFamilies(); InitSystemFonts(mainPtr); #if TK_MAC_COALESCE_LINE Tcl_DStringInit(¤tLine); #endif } /* *------------------------------------------------------------------------- * * InitSystemFonts -- * * Initialize named system fonts. * * Results: * * None. * * Side effects: * * None. * *------------------------------------------------------------------------- */ static void InitSystemFonts( TkMainInfo *mainPtr) { Tcl_Interp *interp = mainPtr->interp; Tk_Window tkwin = (Tk_Window) mainPtr->winPtr; const struct SystemFontMapEntry *systemFont = systemFontMap; TkFontAttributes fa; /* force this for now */ if (!mainPtr->winPtr->mainPtr) { mainPtr->winPtr->mainPtr = mainPtr; } TkInitFontAttributes(&fa); while (systemFont->systemName) { Str255 fontName; SInt16 fontSize; Style fontStyle; if (GetThemeFont(systemFont->id, smSystemScript, fontName, &fontSize, &fontStyle) == noErr) { CopyPascalStringToC(fontName, (char*)fontName); fa.family = Tk_GetUid((char*)fontName); fa.size = fontSize; fa.weight = (fontStyle & bold) ? TK_FW_BOLD : TK_FW_NORMAL; fa.slant = (fontStyle & italic) ? TK_FS_ITALIC : TK_FS_ROMAN; fa.underline = ((fontStyle & underline) != 0); CreateNamedSystemFont(interp, tkwin, systemFont->systemName, &fa); if (systemFont->tkName) { CreateNamedSystemFont(interp, tkwin, systemFont->tkName, &fa); } if (systemFont->tkName1) { CreateNamedSystemFont(interp, tkwin, systemFont->tkName1, &fa); } } systemFont++; } fa.family = Tk_GetUid("monaco"); fa.size = 11; fa.weight = TK_FW_NORMAL; fa.slant = TK_FS_ROMAN; fa.underline = 0; CreateNamedSystemFont(interp, tkwin, "TkFixedFont", &fa); } /* *------------------------------------------------------------------------- * * 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); } /* *--------------------------------------------------------------------------- * * 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; } CopyPascalStringToC(fontName, (char*)fontName); fontPtr = (MacFont *) ckalloc(sizeof(MacFont)); InitFont(fontFamily, (char*)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 qdStyle; FMFontFamily familyId; const char *name; const MacFontFamily *familyPtr; MacFont *fontPtr; familyId = GetAppFont(); name = NULL; qdStyle = 0; if (faPtr->family != NULL) { familyPtr = FindFontFamilyOrAliasOrFallback(faPtr->family); if (familyPtr != NULL) { name = familyPtr->name; familyId = familyPtr->familyId; } } if (faPtr->weight != TK_FW_NORMAL) { qdStyle |= bold; } if (faPtr->slant != TK_FS_ROMAN) { qdStyle |= italic; } if (faPtr->underline) { qdStyle |= underline; } if (tkFontPtr == NULL) { fontPtr = (MacFont *) ckalloc(sizeof(MacFont)); } else { fontPtr = (MacFont *) tkFontPtr; ReleaseFont(fontPtr); } InitFont(familyId, name, TkFontGetPoints(tkwin, faPtr->size), qdStyle, 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. */ { Tcl_SetObjResult(interp, EnumFontFamilies()); } /* *------------------------------------------------------------------------- * * 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. */ { /* We don't know much about our fallback fonts, ATSU does all that for * us. We could use ATSUMatchFont to implement this function. But as * the information is only used for testing, such an effort seems not * very useful. */ } /* *---------------------------------------------------------------------- * * 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 */ Tcl_UniChar c, /* Character of interest */ TkFontAttributes* faPtr) /* Output: Font attributes */ { const MacFont * fontPtr = (const MacFont *) tkfont; UniChar uchar = c; TkMacOSXDrawingContext drawingContext; OSStatus err; ATSUFontID fontId; UniCharArrayOffset changedOffset; UniCharCount changedLength; /* * Most of the attributes are just copied from the base font. This * assumes that all fonts can have all attributes. */ *faPtr = fontPtr->font.fa; /* * But the name of the actual font may still differ, so we activate the * string as an ATSU layout and ask ATSU about the fallback. */ if (!TkMacOSXSetupDrawingContext(Tk_WindowId(tkwin), NULL, 1, &drawingContext)) { Tcl_Panic("TkpGetFontAttrsForChar: drawingContext not setup"); } LayoutSetString(fontPtr, &drawingContext, &uchar, 1); fontId = fontPtr->atsuFontId; err = ATSUMatchFontsToText( fontPtr->atsuLayout, 0, 1, &fontId, &changedOffset, &changedLength); if (err != kATSUFontsMatched && err != noErr) { TkMacOSXDbgMsg("Can't match \\u%04X", (unsigned) c); } if (err == kATSUFontsMatched) { /* * A fallback was used and the actual font is in fontId. Determine * the name. */ FMFontFamily fontFamilyId; FMFontStyle fontStyle; int i; err = ChkErr(FMGetFontFamilyInstanceFromFont, fontId, &fontFamilyId, &fontStyle); if (err == noErr) { /* * Find the canonical name in our global list. */ for (i=0; ifamily = familyList[i].name; break; } } if (i >= familyListMaxValid) { TkMacOSXDbgMsg("Can't find font %d for \\u%04X", fontFamilyId, (unsigned) c); } } } TkMacOSXRestoreDrawingContext(&drawingContext); } /* *--------------------------------------------------------------------------- * * 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; int curX = -1, curByte = 0; UniChar *uchars; int ulen; UniCharArrayOffset urstart, urlen, urend; Tcl_DString ucharBuffer; int forceCharacterMode = 0; /* * Sanity checks. */ if (rangeStart < 0 || (rangeStart+rangeLength) > numBytes) { TkMacOSXDbgMsg("Bad parameters"); *lengthPtr = 0; return 0; } /* * Get simple no-brainers out of the way. */ if (rangeLength == 0 || (maxLength == 0 && !(flags & TK_AT_LEAST_ONE))) { *lengthPtr = 0; return 0; } Tcl_DStringInit(&ucharBuffer); uchars = Tcl_UtfToUniCharDString(source, numBytes, &ucharBuffer); ulen = Tcl_DStringLength(&ucharBuffer) / sizeof(Tcl_UniChar); LayoutSetString(fontPtr, NULL, uchars, ulen); urstart = Tcl_NumUtfChars(source, rangeStart); urlen = Tcl_NumUtfChars(source+rangeStart,rangeLength); urend = urstart + urlen; if (maxLength < 0) { curX = MeasureStringWidth(fontPtr, urstart, urend); curByte = rangeLength; } else { UniCharArrayOffset offset = 0; OSStatus err; /* * Have some upper limit on the size actually used. */ if (maxLength > 32767) { maxLength = 32767; } offset = urstart; err = noErr; if (maxLength > 1) { /* * Let the system do some work by calculating a line break. * * Somehow ATSUBreakLine seems to assume that it needs at least * one pixel padding. So we add one to the limit. Note also * that ATSUBreakLine sometimes runs into an endless loop when * the third parameter is equal or less than IntToFixed(2), so we * need at least IntToFixed(3) (at least that's the current state * of my knowledge). */ err = ATSUBreakLine(fontPtr->atsuLayout, urstart, IntToFixed(maxLength+1), false, /* !iUseAsSoftLineBreak */ &offset); /* * There is no way to signal an error from this routine, so we * use predefined offset=urstart and otherwise ignore the * possibility. */ if ((err != noErr) && (err != kATSULineBreakInWord)) { TkMacOSXDbgMsg("ATSUBreakLine failed: %ld for '%.*s'", err, rangeLength, source+rangeStart); } #ifdef TK_MAC_DEBUG_FONTS TkMacOSXDbgMsg("measure: '%.*s', break offset=%ld, errcode=%ld", rangeLength, source+rangeStart, offset, err); #endif /* * ATSUBreakLine includes the whitespace that separates words, * but we don't want that. Besides, ATSUBreakLine thinks that * spaces don't occupy pixels at the end of the break, which is * also something we like to decide for ourself. */ while ((offset > urstart) && (uchars[offset-1] == ' ')) { offset--; } } /* * Fix up left-overs for the TK_WHOLE_WORDS case. */ if (flags & TK_WHOLE_WORDS) { if ((flags & TK_AT_LEAST_ONE) && ((offset == urstart) || ((offset != urend) && (uchars[offset] != ' ')))) { /* * With TK_AT_LEAST_ONE, if we are the the start of the * range, we need to add at least one character. If we are * not at the end of a word, we must be in the middle of the * first word still and we want to just use what we have so * far. In both cases we still need to find the right * character boundary, so we set a flag that gets us into the * code for character mode below. */ forceCharacterMode = 1; } else { /* * If we are not at the end of a word, we must be in the * middle of the first word still. Return 0. */ if ((offset != urend) && (uchars[offset] != ' ')) { offset = urstart; curX = 0; } } } if (offset > urend) { offset = urend; } /* * If "flags" says that we don't actually want a word break, we need * to find the next character break ourself, as ATSUBreakLine will * only give us word breaks. Do a simple linear search. * * Even do this, if ATSUBreakLine returned kATSULineBreakInWord, * because we have not accounted correctly for all of the flags yet, * like TK_AT_LEAST_ONE. */ if ((!(flags & TK_WHOLE_WORDS) || forceCharacterMode) && (offset <= urend)) { UniCharArrayOffset lastOffset = offset; UniCharArrayOffset nextoffset; int lastX = -1; int wantonemorechar = -1; /* undecided */ while (offset <= urend) { if (flags & TK_ISOLATE_END) { LayoutSetString(fontPtr, NULL, uchars, offset); } curX = MeasureStringWidth(fontPtr, urstart, offset); #ifdef TK_MAC_DEBUG_FONTS TkMacOSXDbgMsg("measure: '%.*s', try until=%ld, width=%d", rangeLength, source+rangeStart, offset, curX); #endif if (curX > maxLength) { /* * Even if we are over the limit, we may want another * character in some situations. Than we keep looking * for one more character. */ if (wantonemorechar == -1) { wantonemorechar = ((flags & TK_AT_LEAST_ONE) && (lastOffset == urstart)) || ((flags & TK_PARTIAL_OK) && (lastX != maxLength)); if (!wantonemorechar) { break; } lastX = curX; } /* * There may belong combining marks to this character. * Wait for a new curX to collect them all. */ if (lastX != curX) { break; } } /* * Save this position, so we can come back to it. */ lastX = curX; lastOffset = offset; /* * Increment offset by one character, taking combining marks * into account. */ if (offset >= urend) { break; } nextoffset = 0; if (flags & TK_ISOLATE_END) { LayoutSetString(fontPtr, NULL, uchars, ulen); } err = ChkErr(ATSUNextCursorPosition, fontPtr->atsuLayout, offset, kATSUByCluster, &nextoffset); if (err != noErr) { break; } if (nextoffset <= offset) { #ifdef TK_MAC_DEBUG_FONTS TkMacOSXDbgMsg("ATSUNextCursorPosition: Can't move further" " (shouldn't happen, bad data?)"); #endif break; } offset = nextoffset; } /* * We have overshot one character, so backup one position. */ curX = lastX; offset = lastOffset; } if (curX < 0) { if (flags & TK_ISOLATE_END) { LayoutSetString(fontPtr, NULL, uchars, offset); } curX = MeasureStringWidth(fontPtr, urstart, offset); } curByte = Tcl_UtfAtIndex(source, offset) - source; curByte -= rangeStart; } Tcl_DStringFree(&ucharBuffer); #ifdef TK_MAC_DEBUG_FONTS TkMacOSXDbgMsg("measure: '%.*s', maxLength=%d, flags=%s%s%s%s " "-> width=%d, bytes=%d", 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 " : "", curX, curByte); #endif *lengthPtr = curX; return curByte; } /* *--------------------------------------------------------------------------- * * 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. */ { TkpDrawCharsInContext(display, drawable, gc, tkfont, source, numBytes, 0, numBytes, x, y); } /* *--------------------------------------------------------------------------- * * 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. */ { const MacFont * fontPtr = (const MacFont *) tkfont; MacDrawable *macWin = (MacDrawable *) drawable; Fixed fx, fy; int ulen, urstart, urlen; const UniChar * uchars; int lineOffset; TkMacOSXDrawingContext drawingContext; #if !TK_MAC_COALESCE_LINE Tcl_DString runString; #endif if (!TkMacOSXSetupDrawingContext(drawable, gc, tkMacOSXUseCGDrawing, &drawingContext)) { return; } #if 0 /* * TODO: implement stippled text drawing */ if ((gc->fill_style == FillStippled || gc->fill_style == FillOpaqueStippled) && gc->stipple != None) { #error Stippling not implemented } #endif x += macWin->xOff; y += macWin->yOff; /* Turn the y coordinate upside-down for Quarz drawing. */ if (drawingContext.context) { CGContextConcatCTM(drawingContext.context, CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0, drawingContext.portBounds.bottom - drawingContext.portBounds.top)); y = drawingContext.portBounds.bottom - drawingContext.portBounds.top - y; } fy = IntToFixed(y); #if TK_MAC_COALESCE_LINE UpdateLineBuffer( fontPtr, &drawingContext, source, numBytes, x, y, &lineOffset); fx = IntToFixed(currentLeft); uchars = (const Tcl_UniChar*) Tcl_DStringValue(¤tLine); ulen = Tcl_DStringLength(¤tLine) / sizeof(uchars[0]); #else lineOffset = 0; fx = IntToFixed(x); Tcl_DStringInit(&runString); uchars = Tcl_UtfToUniCharDString(source, numBytes, &runString); ulen = Tcl_DStringLength(&runString) / sizeof(uchars[0]); LayoutSetString(fontPtr, &drawingContext, uchars, ulen); #endif urstart = Tcl_NumUtfChars(source, rangeStart); urlen = Tcl_NumUtfChars(source+rangeStart,rangeLength); ChkErr(ATSUDrawText, fontPtr->atsuLayout, lineOffset+urstart, urlen, fx, fy); #if !TK_MAC_COALESCE_LINE Tcl_DStringFree(&runString); #endif TkMacOSXRestoreDrawingContext(&drawingContext); } /* *--------------------------------------------------------------------------- * * MeasureStringWidth -- * * Low-level measuring of strings. * * Results: * The width of the string in pixels. * * Side effects: * None. * * Assumptions: * fontPtr->atsuLayout is setup with the actual string data to measure. * *--------------------------------------------------------------------------- */ static int MeasureStringWidth( const MacFont *fontPtr, /* Contains font, ATSU layout and string data * to measure. */ int start, int end) /* Start and end positions to measure in that * string. */ { /* * This implementation of measuring via ATSUGetGlyphBounds() does not * quite conform with the specification given for [font measure]: * * The return value is the total width in pixels of text, not * including the extra pixels used by highly exagerrated characters * such as cursive "f". * * Instead the result of ATSUGetGlyphBounds() *does* include these * "extra pixels". */ ATSTrapezoid bounds; ItemCount numBounds; if (end <= start) { return 0; } bounds.upperRight.x = bounds.upperLeft.x = 0; ChkErr(ATSUGetGlyphBounds, fontPtr->atsuLayout, 0, 0, start, end-start, kATSUseFractionalOrigins, 1, &bounds, &numBounds); #ifdef TK_MAC_DEBUG_FONTS if (numBounds < 1 || numBounds > 1) { TkMacOSXDbgMsg("ATSUGetGlyphBounds: %s output", numBounds < 1 ? "No " : "More"); } #endif return FixedToInt(bounds.upperRight.x - bounds.upperLeft.x); } #if TK_MAC_COALESCE_LINE /* *------------------------------------------------------------------------- * * UpdateLineBuffer -- * * See the general dicussion of TK_MAC_COALESCE_LINE on the header * pages. This function maintains the data for this feature. * * Results: * * The Tcl_UniChar string of the whole line as seen so far. * * Side effects: * "*offset" is filled with the index of the first new character in * "currentLine". The globals currentLine, currentY, currentLeft, * currentRight and currentFontPtr are updated as necessary. * * The currentLine string is set as the current text in * fontPtr->atsuLayout (see LayoutSetString()). * *------------------------------------------------------------------------- */ static const Tcl_UniChar * UpdateLineBuffer( const MacFont *fontPtr, /* The font to be used for the new piece of * text. */ const TkMacOSXDrawingContext *drawingContextPtr, /* The Quarz drawing parameters. Needed for * measuring the new piece. */ const char *source, /* A new piece of line to be added. */ int numBytes, /* Length of the new piece. */ int x, int y, /* Position of the new piece in the window. */ int *offset) /* Filled with the offset of the new piece in * currentLine. */ { const Tcl_UniChar * uchars; int ulen; if (y != currentY || x < currentRight-1 || x > currentRight+2 || currentFontPtr != fontPtr) { Tcl_DStringFree(¤tLine); Tcl_DStringInit(¤tLine); currentY = y; currentLeft = x; currentFontPtr = fontPtr; *offset = 0; } else { *offset = Tcl_DStringLength(¤tLine) / 2; } Tcl_UtfToUniCharDString(source, numBytes, ¤tLine); uchars = (const Tcl_UniChar*) Tcl_DStringValue(¤tLine); ulen = Tcl_DStringLength(¤tLine) / sizeof(*uchars); LayoutSetString(fontPtr, drawingContextPtr, uchars, ulen); currentRight = x + MeasureStringWidth(fontPtr, *offset, ulen); return uchars; } #endif /* TK_MAC_COALESCE_LINE */ /* *--------------------------------------------------------------------------- * * FamilyNameForFamilyID -- * * Helper for InitFont() and TkMacOSXFontDescriptionForFMFontInfo(). * Retrieves font family names for a given font family ID. * * Results: * Font family name or NULL. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static const char * FamilyNameForFamilyID( FMFontFamily familyId) { OSStatus err; char name[256] = ""; const MacFontFamily * familyPtr = NULL; err = ChkErr(GetFontFamilyName, familyId, name, sizeof(name)); if (err == noErr) { /* * We find the canonical font name, so we can avoid unnecessary * memory management. */ familyPtr = FindFontFamily(name); #ifdef TK_MAC_DEBUG_FONTS if (!familyPtr) { TkMacOSXDbgMsg("Font family '%s' not found", name); } #endif } return familyPtr ? familyPtr->name : NULL; } /* *--------------------------------------------------------------------------- * * 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( FMFontFamily familyId, /* The font family to initialize for. */ const char * familyName, /* The font family name, if known. Otherwise * this can be NULL. */ int size, /* Point size for the font. */ int qdStyle, /* QuickDraw style bits. */ MacFont * fontPtr) /* Filled with information constructed from the * above arguments. */ { FontInfo fi; TkFontAttributes * faPtr; TkFontMetrics * fmPtr; int periodWidth, wWidth; if (size == 0) { size = GetDefFontSize(); } ChkErr(FetchFontInfo, familyId, size, qdStyle, &fi); if (!familyName) { familyName = FamilyNameForFamilyID(familyId); } fontPtr->font.fid = (Font) fontPtr; faPtr = &fontPtr->font.fa; faPtr->family = familyName; faPtr->size = size; faPtr->weight = (qdStyle & bold) ? TK_FW_BOLD : TK_FW_NORMAL; faPtr->slant = (qdStyle & italic) ? TK_FS_ITALIC : TK_FS_ROMAN; faPtr->underline = ((qdStyle & underline) != 0); faPtr->overstrike = 0; fmPtr = &fontPtr->font.fm; /* * Note: Macs measure the line height as ascent + descent + * leading. Leading as a separate entity does not exist in X11 * and Tk. We add it to the ascent at the moment, because adding * it to the descent, as the Mac docs would indicate, would change * the position of self-drawn underlines. */ fmPtr->ascent = fi.ascent + fi.leading; fmPtr->descent = fi.descent; fmPtr->maxWidth = fi.widMax; fontPtr->qdFont = familyId; fontPtr->qdSize = size; fontPtr->qdStyle = (short) qdStyle; InitATSUObjects(familyId, size, qdStyle, &fontPtr->atsuFontId, &fontPtr->atsuLayout, &fontPtr->atsuStyle); Tk_MeasureChars((Tk_Font)fontPtr, ".", 1, -1, 0, &periodWidth); Tk_MeasureChars((Tk_Font)fontPtr, "W", 1, -1, 0, &wWidth); fmPtr->fixed = periodWidth == wWidth; SetFontFeatures(fontPtr->atsuFontId, fmPtr->fixed, size, fontPtr->atsuStyle); AdjustFontHeight(fontPtr); } /* *--------------------------------------------------------------------------- * * InitATSUObjects -- * * Helper for InitFont(). Initializes the ATSU data handles for a * MacFont. * * Results: * Sets up all we know and can do at this point in time in fontIdPtr, * layoutPtr and stylePtr. * * Side effects: * Allocates data structures inside of ATSU. * *--------------------------------------------------------------------------- */ static void InitATSUObjects( FMFontFamily familyId, /* The font family to use. */ short ptSize, short qdStyles, /* The additional font parameters. */ ATSUFontID *fontIdPtr, /* Filled with the font id. */ ATSUTextLayout *layoutPtr, /* Filled with the ATSU layout handle. */ ATSUStyle *stylePtr) /* Filled with the ATSU style handle, * configured with all parameters. */ { FMFontStyle stylesDone, stylesLeft; /* * Defaults in case of error. */ *fontIdPtr = GetAppFont(); *stylePtr = 0; *layoutPtr = 0; /* * Generate a font id from family id and QD style bits. */ ChkErr(FMGetFontFromFontFamilyInstance, familyId, qdStyles, fontIdPtr, &stylesDone); /* * We see what style bits are left and tell ATSU to synthesize what's * left like QD does it. */ stylesLeft = qdStyles & ~(unsigned)stylesDone; /* * Create the style and set its attributes. */ ChkErr(ATSUCreateStyle, stylePtr); InitATSUStyle(*fontIdPtr, ptSize, stylesLeft, *stylePtr); /* * Create the layout. Note: We can't set the layout attributes here, * because the text and the style must be set first. */ ChkErr(ATSUCreateTextLayout, layoutPtr); /*InitATSULayout(*layoutPtr);*/ } /* *--------------------------------------------------------------------------- * * InitATSUStyle -- * * Helper for InitATSUObjects(). Initializes the ATSU style for a * MacFont. * * Results: * Sets up all parameters needed for an ATSU style. * * Side effects: * Allocates data structures for the style inside of ATSU. * *--------------------------------------------------------------------------- */ static void InitATSUStyle( ATSUFontID fontId, /* The font id to use. */ short ptSize, short qdStyles, /* Additional font parameters. */ ATSUStyle style) /* The style handle to configure. */ { /* * Attributes for the style. */ Fixed fsize = IntToFixed(ptSize); Boolean isBold = (qdStyles&bold) != 0, isUnderline = (qdStyles&underline) != 0, isItalic = (qdStyles&italic) != 0; ATSStyleRenderingOptions options = antialiasedTextEnabled == -1 ? kATSStyleNoOptions : antialiasedTextEnabled == 0 ? kATSStyleNoAntiAliasing : kATSStyleApplyAntiAliasing; static const ATSUAttributeTag styleTags[] = { kATSUFontTag, kATSUSizeTag, kATSUQDBoldfaceTag, kATSUQDItalicTag, kATSUQDUnderlineTag, kATSUStyleRenderingOptionsTag, }; static const ByteCount styleSizes[] = { sizeof(ATSUFontID), sizeof(Fixed), sizeof(Boolean), sizeof(Boolean), sizeof(Boolean), sizeof(ATSStyleRenderingOptions), }; const ATSUAttributeValuePtr styleValues[] = { &fontId, &fsize, &isBold, &isItalic, &isUnderline, &options, }; ChkErr(ATSUSetAttributes, style, sizeof(styleTags)/sizeof(styleTags[0]), styleTags, styleSizes, styleValues); } /* *--------------------------------------------------------------------------- * * SetFontFeatures -- * * Helper for InitFont(). Request specific font features of the ATSU * style object for a MacFont. * * Results: * None. * * Side effects: * Specific font features are enabled on the ATSU style object. * *--------------------------------------------------------------------------- */ static void SetFontFeatures( ATSUFontID fontId, /* The font id to use. */ int fixed, /* Is this a fixed font? */ short size, /* Size of the font */ ATSUStyle style) /* The style handle to configure. */ { /* * Don't use the standard latin ligatures, if this is determined to be a * fixed-width font. */ static const ATSUFontFeatureType fixed_featureTypes[] = { kLigaturesType, kLigaturesType }; static const ATSUFontFeatureSelector fixed_featureSelectors[] = { kCommonLigaturesOffSelector, kRareLigaturesOffSelector }; if (fixed) { ChkErr(ATSUSetFontFeatures, style, sizeof(fixed_featureTypes) / sizeof(fixed_featureTypes[0]), fixed_featureTypes, fixed_featureSelectors); if (size <= 10) { /* * Disable antialiasing of fixed-width fonts with sizes <= 10 */ const ATSStyleRenderingOptions options = kATSStyleNoAntiAliasing; const ATSUAttributeTag styleTag = kATSUStyleRenderingOptionsTag; const ByteCount styleSize = sizeof(ATSStyleRenderingOptions); const ConstATSUAttributeValuePtr styleValue = &options; ChkErr(ATSUSetAttributes, style, 1, &styleTag, &styleSize, (ATSUAttributeValuePtr*) &styleValue); } } } /* *--------------------------------------------------------------------------- * * AdjustFontHeight -- * * Helper for InitFont(). Check font height against some real world * examples. * * Results: * None. * * Side effects: * The metrics in fontPtr->font.fm are adjusted so that typical combined * characters fit into ascent+descent. * *--------------------------------------------------------------------------- */ static void AdjustFontHeight( MacFont * fontPtr) { /* * The standard values for ascent, descent and leading as determined in * InitFont do not take composition into account, they are designed for * plain ASCII characters. This code measures the actual size of some * typical composed characters from the Latin-1 range and corrects these * factors, especially the ascent. * * A font requested with a pixel size may thus have a larger line height * than requested. * * An alternative would be to instruct ATSU to shrink oversized combined * characters. I think I have seen that feature somewhere, but I can't * find it now [BR]. */ static const UniChar chars[] /* Auml, Aacute, Acirc, Atilde, Ccedilla */ = {0x00C4, 0x00C1, 0x00C2, 0x00C3, 0x00C7}; static const int charslen = sizeof(chars) / sizeof(chars[0]); Rect size; OSStatus err; LayoutSetString(fontPtr, NULL, chars, charslen); size.top = size.bottom = 0; err = ChkErr(ATSUMeasureTextImage, fontPtr->atsuLayout, 0, charslen, 0, 0, &size); if (err == noErr) { TkFontMetrics * fmPtr = &fontPtr->font.fm; int ascent = -size.top; int descent = size.bottom; if (ascent > fmPtr->ascent) { fmPtr->ascent = ascent; } if (descent > fmPtr->descent) { fmPtr->descent = descent; } } } /* *--------------------------------------------------------------------------- * * InitATSULayout -- * * Helper for LayoutSetString(). Initializes the ATSU layout * object for a MacFont and a specific string. * * Results: * Sets up all parameters needed for an ATSU layout object. * * Side effects: * Allocates data structures for the layout object inside of ATSU. * * Assumptions: * The actual string data and style information is already set by * ATSUSetTextPointerLocation() and ATSUSetRunStyle() (see * LayoutSetString()). * *--------------------------------------------------------------------------- */ static void InitATSULayout( const TkMacOSXDrawingContext *drawingContextPtr, /* Specifies the CGContext to use. */ ATSUTextLayout layout, /* The layout object to configure. */ int fixed) /* Is this a fixed font? */ { /* * Attributes for the layout. */ ATSLineLayoutOptions layoutOptions = 0 #if TK_MAC_COALESCE_LINE /* * Options to use unconditionally when we try to do coalescing. */ | kATSLineDisableAllLayoutOperations | kATSLineFractDisable | kATSLineUseDeviceMetrics #endif ; CGContextRef context = drawingContextPtr ? drawingContextPtr->context : NULL; static const ATSUAttributeTag layoutTags[] = { kATSUCGContextTag, kATSULineLayoutOptionsTag, }; static const ByteCount layoutSizes[] = { sizeof(CGContextRef), sizeof(ATSLineLayoutOptions), }; const ATSUAttributeValuePtr layoutValues[] = { &context, &layoutOptions, }; /* * Ensure W(abcdefg) == W(a)*7 for fixed fonts (Latin scripts only). */ if (fixed) { layoutOptions |= kATSLineFractDisable | kATSLineUseDeviceMetrics; } ChkErr(ATSUSetLayoutControls, layout, sizeof(layoutTags) / sizeof(layoutTags[0]), layoutTags, layoutSizes, layoutValues); ChkErr(ATSUSetTransientFontMatching, layout, true); } /* *--------------------------------------------------------------------------- * * LayoutSetString -- * * Setup the MacFont for a specific string. * * Results: * Sets up all parameters so that ATSU can work with the objects in * MacFont. * * Side effects: * Sets parameters on the layout object fontPtr->atsuLayout. * *--------------------------------------------------------------------------- */ void LayoutSetString( const MacFont *fontPtr, /* The fontPtr to configure. */ const TkMacOSXDrawingContext *drawingContextPtr, /* For the CGContext to be used.*/ const UniChar *uchars, int ulen) /* The UniChar string to set into * fontPtr->atsuLayout. */ { ChkErr(ATSUSetTextPointerLocation, fontPtr->atsuLayout, uchars, kATSUFromTextBeginning, ulen, ulen); /* * Styles can only be set after the text is set. */ ChkErr(ATSUSetRunStyle, fontPtr->atsuLayout, fontPtr->atsuStyle, kATSUFromTextBeginning, kATSUToTextEnd); /* * Layout attributes can only be set after the styles are set. */ InitATSULayout(drawingContextPtr, fontPtr->atsuLayout, fontPtr->font.fm.fixed); } /* *------------------------------------------------------------------------- * * 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. */ { ATSUDisposeTextLayout(fontPtr->atsuLayout); ATSUDisposeStyle(fontPtr->atsuStyle); } /* *------------------------------------------------------------------------- * * FindFontFamilyOrAlias, FindFontFamilyOrAliasOrFallback -- * * Determine 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. * * FindFontFamilyOrAlias also considers font aliases as determined by * TkFontGetAliasList(). * * FindFontFamilyOrAliasOrFallback also considers font aliases as * determined by TkFontGetFallbacks(). * * The overall algorithm to get the closest font to the one requested is * this: * * try fontname * try all aliases for fontname * foreach fallback for fontname * try the fallback * try all aliases for the fallback * * Results: * * The return value is NULL if the specified font family does not exist, * a valid MacFontFamily* otherwise. * * Side effects: * * None. * *------------------------------------------------------------------------- */ static const MacFontFamily * FindFontFamilyOrAlias( const char *name) /* Name or alias name of the font to find. */ { const MacFontFamily * familyPtr; char ** aliases; int i; familyPtr = FindFontFamily(name); if (familyPtr != NULL) { return familyPtr; } aliases = TkFontGetAliasList(name); if (aliases != NULL) { for (i = 0; aliases[i] != NULL; i++) { familyPtr = FindFontFamily(aliases[i]); if (familyPtr != NULL) { return familyPtr; } } } return NULL; } static const MacFontFamily * FindFontFamilyOrAliasOrFallback( const char *name) /* Name or alias name of the font to find. */ { const MacFontFamily * familyPtr; const char * fallback; char *** fallbacks; int i, j; familyPtr = FindFontFamilyOrAlias(name); if (familyPtr != NULL) { return familyPtr; } fallbacks = TkFontGetFallbacks(); for (i = 0; fallbacks[i] != NULL; i++) { for (j = 0; (fallback = fallbacks[i][j]) != NULL; j++) { if (strcasecmp(name, fallback) == 0) { for (j = 0; (fallback = fallbacks[i][j]) != NULL; j++) { familyPtr = FindFontFamilyOrAlias(fallback); if (familyPtr != NULL) { return familyPtr; } } } break; /* benny: This "break" is a carry-over from * tkMacOSXFont.c, but what is actually its purpose * ???? */ } } /* * FIXME: We would have liked to recover by re-enumerating fonts. But * that doesn't work, because Carbon seems to cache the inital list of * fonts. Fonts newly installed don't show up with * FMCreateFontFamilyIterator()/FMGetNextFontFamily() without a restart * of the app. Similar problem with fonts removed. */ #ifdef TK_MAC_DEBUG_FONTS TkMacOSXDbgMsg("Font family '%s' not found", name); #endif return NULL; } /* *------------------------------------------------------------------------- * * InitFontFamilies -- * * Helper to TkpFontPkgInit. Use the Font Manager to fill in the * familyList global array. * * Results: * * None. * * Side effects: * * Allocates memory. * *------------------------------------------------------------------------- */ static void InitFontFamilies(void) { FMFontFamily fontFamily; Str255 fontName; SInt16 fontSize; Style fontStyle; /* * Has this been called before? */ if (familyListNextFree > 0) { return; } ChkErr(ATSFontFamilyApplyFunction, FontFamilyEnumCallback,NULL); if (GetThemeFontAndFamily(kThemeSystemFont, &fontFamily, fontName, &fontSize, &fontStyle) == noErr) { AddFontFamily(SYSTEMFONT_NAME, fontFamily); } if (GetThemeFontAndFamily(kThemeApplicationFont, &fontFamily, fontName, &fontSize, &fontStyle) == noErr) { AddFontFamily(APPLFONT_NAME, fontFamily); } if (GetThemeFontAndFamily(kThemeMenuItemFont, &fontFamily, fontName, &fontSize, &fontStyle) == noErr) { AddFontFamily(MENUITEMFONT_NAME, fontFamily); } SortFontFamilies(); } /* *------------------------------------------------------------------------- * * FontFamilyEnumCallback -- * * Callback for ATSFontFamilyApplyFunction(). * * Results: * * noErr. * * Side effects: * * None. * *------------------------------------------------------------------------- */ static OSStatus FontFamilyEnumCallback( ATSFontFamilyRef family, void *refCon) { OSStatus err; char name[260] = ""; (void) refCon; err = ChkErr(GetFontFamilyName, family, name, sizeof(name)); if (err == noErr) { AddFontFamily(name, family); } return noErr; } /* *------------------------------------------------------------------------- * * GetFontFamilyName -- * * Use the Font Manager to get the name of a given FMFontfamily. This * currently gets the standard, non-localized QuickDraw name. Other * names would be possible, see docs for ATSUFindFontName for a * selection. The MacOSX font selector seems to use the localized * family name given by ATSUFindFontName(kFontFamilyName), but that API * doesn't give us a name at all for some fonts. * * Results: * An OS error code, noErr on success. name is filled with the * resulting name. * * Side effects: * None. * *------------------------------------------------------------------------- */ static OSStatus GetFontFamilyName( FMFontFamily fontFamily, /* The font family for which to find the * name. */ char * name, int numBytes) /* Filled with the result. */ { OSStatus err; Str255 nativeName; CFStringRef cfString; TextEncoding encoding; ScriptCode nameencoding; nativeName[0] = 0; name[0] = 0; err = ChkErr(FMGetFontFamilyName, fontFamily, nativeName); if (err != noErr) { return err; } /* * QuickDraw font names are encoded with the script that the font uses. * So we determine that encoding and than we reencode the name. */ encoding = kTextEncodingMacRoman; ChkErr(FMGetFontFamilyTextEncoding, fontFamily, &encoding); nameencoding = encoding; ChkErr(RevertTextEncodingToScriptInfo, encoding, &nameencoding, NULL, NULL); /* * Note: We could use Tcl facilities to do the re-encoding here. We'd * have to maintain tables to map OS encoding codes to Tcl encoding names * like tkMacOSXFont.c did. Using native re-encoding directly instead is * a lot easier and future-proof than that. There is one snag, though: I * have seen CFStringGetCString() crash with invalid encoding ids. But * than if that happens it would be a bug in * FMGetFontFamilyTextEncoding() or RevertTextEncodingToScriptInfo(). */ cfString = CFStringCreateWithPascalStringNoCopy( NULL, nativeName, nameencoding, kCFAllocatorNull); CFStringGetCString( cfString, name, numBytes, kCFStringEncodingUTF8); CFRelease(cfString); return noErr; } /* *------------------------------------------------------------------------- * * FindFontFamily -- * * Find the font family with the given name in the global familyList. * Uses bsearch() for convenient access. Comparision is done * non-case-sensitively with CompareFontFamilies() which see. * * Results: * * MacFontFamily: A pair of family id and the actual name registered for * the font. * * Side effects: * * None. * * Assumption: * * Requires the familyList array to be sorted. * *------------------------------------------------------------------------- */ static const MacFontFamily * FindFontFamily( const char *name) /* The family name. Note: Names are compared * non-case-sensitive. */ { const MacFontFamily key = {name,-1}; if(familyListMaxValid <= 0) { return NULL; } return bsearch(&key, familyList, familyListMaxValid, sizeof(*familyList), CompareFontFamilies); } /* *------------------------------------------------------------------------- * * EnumFontFamilies -- * * Create a Tcl list with the registered names in the global familyList. * * Results: * A Tcl list of names. * * Side effects: * None. * *------------------------------------------------------------------------- */ static Tcl_Obj * EnumFontFamilies(void) { int i; Tcl_Obj * tclList; tclList = Tcl_NewListObj(0, NULL); for (i=0; i= familyListSize) { familyListSize += 100; familyList = (MacFontFamily *) ckrealloc((void*) familyList, familyListSize * sizeof(*familyList)); } familyPtr = familyList + familyListNextFree; ++familyListNextFree; familyPtr->name = AddString(name); familyPtr->familyId = familyId; return familyPtr; } /* *------------------------------------------------------------------------- * * SortFontFamilies -- * * Sort the entries in familyList. Only after calling * SortFontFamilies(), the new families registered with AddFontFamily() * are actually available for FindFontFamily(), because FindFontFamily() * requires the array to be sorted. * * Results: * * None. * * Side effects: * * familyList is sorted and familyListMaxValid is updated. * *------------------------------------------------------------------------- */ static void SortFontFamilies(void) { if (familyListNextFree > 0) { qsort(familyList, familyListNextFree, sizeof(*familyList), CompareFontFamilies); } familyListMaxValid = familyListNextFree; } /* *------------------------------------------------------------------------- * * CompareFontFamilies -- * * Comparison function used by SortFontFamilies() and FindFontFamily(). * * Results: * Result as required to generate a stable sort order for bsearch() and * qsort(). The ordering is not case-sensitive as far as * Tcl_UtfNcasecmp() (which see) can provide that. * * Note: It would be faster to compare first the length and the actual * strings only as a tie-breaker, but than the ordering wouldn't look so * pretty in [font families] ;-). * * Side effects: * None. * *------------------------------------------------------------------------- */ static int CompareFontFamilies( const void * vp1, const void * vp2) { const char * name1; const char * name2; int len1, len2, diff; name1 = ((const MacFontFamily *) vp1)->name; name2 = ((const MacFontFamily *) vp2)->name; len1 = Tcl_NumUtfChars(name1, -1); len2 = Tcl_NumUtfChars(name2, -1); diff = Tcl_UtfNcasecmp(name1, name2, len1nextFree+len) > STRING_BLOCK_MAX) { StringBlock * newblock = (StringBlock *) ckalloc(sizeof(StringBlock)); newblock->next = stringMemory; newblock->nextFree = 0; stringMemory = newblock; } result = stringMemory->strings + stringMemory->nextFree; stringMemory->nextFree += len; memcpy(result, in, len); return result; } /* *--------------------------------------------------------------------------- * * 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. */ { /* Background: This function is private and only used in * tkMacOSXMenu.c:FindMarkCharacter(). * * We could use ATSUMatchFont() to implement. We'd have to change the * definition of the encoding of the parameter searchChar from MacRoman * to UniChar for that. * * The system uses font fallback for controls, so we don't really need * this. */ return 0; } /* *---------------------------------------------------------------------- * * TkMacOSXInitControlFontStyle -- * * This procedure sets up the appropriate ControlFontStyleRec * for a Mac control. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void TkMacOSXInitControlFontStyle( Tk_Font tkfont, /* Tk font object to use for the control. */ ControlFontStylePtr fsPtr) /* The style object to configure. */ { const MacFont * fontPtr = (MacFont *) tkfont; fsPtr->flags = kControlUseFontMask | kControlUseSizeMask | kControlUseFaceMask | kControlUseJustMask; fsPtr->font = fontPtr->qdFont; fsPtr->size = fontPtr->qdSize; fsPtr->style = fontPtr->qdStyle; fsPtr->just = teCenter; } /* *---------------------------------------------------------------------- * * 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: c * c-basic-offset: 4 * fill-column: 79 * coding: utf-8 * End: */