/* * tkWinFont.c -- * * Contains the Windows implementation of the platform-independant * font package interface. * * Copyright (c) 1994 Software Research Associates, Inc. * Copyright (c) 1995-1997 Sun Microsystems, Inc. * Copyright (c) 1998-1999 by Scriptics Corporation. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tkWinFont.c,v 1.1.4.5 1999/03/30 04:13:00 stanton Exp $ */ #include "tkWinInt.h" #include "tkFont.h" /* * The following structure represents a font family. It is assumed that * all screen fonts constructed from the same "font family" share certain * properties; all screen fonts with the same "font family" point to a * shared instance of this structure. The most important shared property * is the character existence metrics, used to determine if a screen font * can display a given Unicode character. * * Under Windows, a "font family" is uniquely identified by its face name. */ #define FONTMAP_SHIFT 10 #define FONTMAP_PAGES (1 << (sizeof(Tcl_UniChar)*8 - FONTMAP_SHIFT)) #define FONTMAP_BITSPERPAGE (1 << FONTMAP_SHIFT) typedef struct FontFamily { struct FontFamily *nextPtr; /* Next in list of all known font families. */ int refCount; /* How many SubFonts are referring to this * FontFamily. When the refCount drops to * zero, this FontFamily may be freed. */ /* * Key. */ Tk_Uid faceName; /* Face name key for this FontFamily. */ /* * Derived properties. */ Tcl_Encoding encoding; /* Encoding for this font family. */ int isSymbolFont; /* Non-zero if this is a symbol font. */ int isWideFont; /* 1 if this is a double-byte font, 0 * otherwise. */ BOOL (WINAPI *textOutProc)(HDC, int, int, TCHAR *, int); /* The procedure to use to draw text after * it has been converted from UTF-8 to the * encoding of this font. */ BOOL (WINAPI *getTextExtentPoint32Proc)(HDC, TCHAR *, int, LPSIZE); /* The procedure to use to measure text after * it has been converted from UTF-8 to the * encoding of this font. */ char *fontMap[FONTMAP_PAGES]; /* Two-level sparse table used to determine * quickly if the specified character exists. * As characters are encountered, more pages * in this table are dynamically added. The * contents of each page is a bitmask * consisting of FONTMAP_BITSPERPAGE bits, * representing whether this font can be used * to display the given character at the * corresponding bit position. The high bits * of the character are used to pick which * page of the table is used. */ /* * Cached Truetype font info. */ int segCount; /* The length of the following arrays. */ USHORT *startCount; /* Truetype information about the font, */ USHORT *endCount; /* indicating which characters this font * can display (malloced). The format of * this information is (relatively) compact, * but would take longer to search than * indexing into the fontMap[][] table. */ } FontFamily; /* * The following structure encapsulates an individual screen font. A font * object is made up of however many SubFonts are necessary to display a * stream of multilingual characters. */ typedef struct SubFont { char **fontMap; /* Pointer to font map from the FontFamily, * cached here to save a dereference. */ HFONT hFont; /* The specific screen font that will be * used when displaying/measuring chars * belonging to the FontFamily. */ FontFamily *familyPtr; /* The FontFamily for this SubFont. */ } SubFont; /* * The following structure represents Windows' implementation of a font * object. */ #define SUBFONT_SPACE 3 #define BASE_CHARS 128 typedef struct WinFont { TkFont font; /* Stuff used by generic font package. Must * be first in structure. */ SubFont staticSubFonts[SUBFONT_SPACE]; /* Builtin space for a limited number of * SubFonts. */ int numSubFonts; /* Length of following array. */ SubFont *subFontArray; /* Array of SubFonts that have been loaded * in order to draw/measure all the characters * encountered by this font so far. All fonts * start off with one SubFont initialized by * AllocFont() from the original set of font * attributes. Usually points to * staticSubFonts, but may point to malloced * space if there are lots of SubFonts. */ HWND hwnd; /* Toplevel window of application that owns * this font, used for getting HDC for * offscreen measurements. */ int pixelSize; /* Original pixel size used when font was * constructed. */ int widths[BASE_CHARS]; /* Widths of first 128 chars in the base * font, for handling common case. The base * font is always used to draw characters * between 0x0000 and 0x007f. */ } WinFont; /* * The following structure is passed as the LPARAM when calling the font * enumeration procedure to determine if a font can support the given * character. */ typedef struct CanUse { HDC hdc; WinFont *fontPtr; Tcl_DString *nameTriedPtr; int ch; SubFont *subFontPtr; } CanUse; /* * The following structure is used to map between the Tcl strings that * represent the system fonts and the numbers used by Windows. */ static TkStateMap systemMap[] = { {ANSI_FIXED_FONT, "ansifixed"}, {ANSI_VAR_FONT, "ansi"}, {DEVICE_DEFAULT_FONT, "device"}, {OEM_FIXED_FONT, "oemfixed"}, {SYSTEM_FIXED_FONT, "systemfixed"}, {SYSTEM_FONT, "system"}, {-1, NULL} }; typedef struct ThreadSpecificData { FontFamily *fontFamilyList; /* The list of font families that are * currently loaded. As screen fonts * are loaded, this list grows to hold * information about what characters * exist in each font family. */ Tcl_HashTable uidTable; } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; /* * Information cached about the system at startup time. */ static int platformId; static Tcl_Encoding unicodeEncoding; static Tcl_Encoding systemEncoding; /* * Procedures used only in this file. */ static FontFamily * AllocFontFamily(HDC hdc, HFONT hFont, int base); static SubFont * CanUseFallback(HDC hdc, WinFont *fontPtr, char *fallbackName, int ch); static SubFont * CanUseFallbackWithAliases(HDC hdc, WinFont *fontPtr, char *faceName, int ch, Tcl_DString *nameTriedPtr); static int FamilyExists(HDC hdc, CONST char *faceName); static char * FamilyOrAliasExists(HDC hdc, CONST char *faceName); static SubFont * FindSubFontForChar(WinFont *fontPtr, int ch); static void FontMapInsert(SubFont *subFontPtr, int ch); static void FontMapLoadPage(SubFont *subFontPtr, int row); static int FontMapLookup(SubFont *subFontPtr, int ch); static void FreeFontFamily(FontFamily *familyPtr); static HFONT GetScreenFont(CONST TkFontAttributes *faPtr, CONST char *faceName, int pixelSize); static void InitFont(Tk_Window tkwin, HFONT hFont, int overstrike, WinFont *tkFontPtr); static void InitSubFont(HDC hdc, HFONT hFont, int base, SubFont *subFontPtr); static int LoadFontRanges(HDC hdc, HFONT hFont, USHORT **startCount, USHORT **endCount, int *symbolPtr); static void MultiFontTextOut(HDC hdc, WinFont *fontPtr, CONST char *source, int numBytes, int x, int y); static void ReleaseFont(WinFont *fontPtr); static void ReleaseSubFont(SubFont *subFontPtr); static int SeenName(CONST char *name, Tcl_DString *dsPtr); static void SwapLong(PULONG p); static void SwapShort(USHORT *p); static int CALLBACK WinFontCanUseProc(ENUMLOGFONT *lfPtr, NEWTEXTMETRIC *tmPtr, int fontType, LPARAM lParam); static int CALLBACK WinFontExistProc(ENUMLOGFONT *lfPtr, NEWTEXTMETRIC *tmPtr, int fontType, LPARAM lParam); static int CALLBACK WinFontFamilyEnumProc(ENUMLOGFONT *lfPtr, NEWTEXTMETRIC *tmPtr, int fontType, LPARAM lParam); /* *------------------------------------------------------------------------- * * 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: * * None. * *------------------------------------------------------------------------- */ void TkpFontPkgInit( TkMainInfo *mainPtr) /* The application being created. */ { OSVERSIONINFO os; os.dwOSVersionInfoSize = sizeof(os); GetVersionEx(&os); platformId = os.dwPlatformId; unicodeEncoding = Tcl_GetEncoding(NULL, "unicode"); if (platformId == VER_PLATFORM_WIN32_NT) { /* * If running NT, then we will be calling some Unicode functions * explictly. So, even if the Tcl system encoding isn't Unicode, * make sure we convert to/from the Unicode char set. */ systemEncoding = unicodeEncoding; } } /* *--------------------------------------------------------------------------- * * TkpGetNativeFont -- * * Map a platform-specific native font name to a TkFont. * * Results: * The return value is a pointer to a TkFont that represents the * native font. If a native font by the given name could not be * found, the return value is NULL. * * Every call to this procedure returns a new TkFont structure, * even if the name has already been seen before. The caller should * call TkpDeleteFont() when the font is no longer needed. * * The caller is responsible for initializing the memory associated * with the generic TkFont when this function returns and releasing * the contents of the generic TkFont before calling TkpDeleteFont(). * * Side effects: * Memory allocated. * *--------------------------------------------------------------------------- */ TkFont * TkpGetNativeFont( Tk_Window tkwin, /* For display where font will be used. */ CONST char *name) /* Platform-specific font name. */ { int object; WinFont *fontPtr; object = TkFindStateNum(NULL, NULL, systemMap, name); if (object < 0) { return NULL; } tkwin = (Tk_Window) ((TkWindow *) tkwin)->mainPtr->winPtr; fontPtr = (WinFont *) ckalloc(sizeof(WinFont)); InitFont(tkwin, GetStockObject(object), 0, 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. NULL is never returned. * * Every call to this procedure returns a new TkFont structure, * even if the specified attributes have already been seen before. * The caller should call TkpDeleteFont() to free the platform- * specific data when the font is no longer needed. * * The caller is responsible for initializing the memory associated * with the generic TkFont when this function returns and releasing * the contents of the generic TkFont before calling TkpDeleteFont(). * * Side effects: * Memory allocated. * *--------------------------------------------------------------------------- */ TkFont * TkpGetFontFromAttributes( 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. */ { int i, j; HDC hdc; HWND hwnd; HFONT hFont; Window window; WinFont *fontPtr; char ***fontFallbacks; char *faceName, *fallback, *actualName; tkwin = (Tk_Window) ((TkWindow *) tkwin)->mainPtr->winPtr; window = Tk_WindowId(tkwin); hwnd = (window == None) ? NULL : TkWinGetHWND(window); hdc = GetDC(hwnd); /* * Algorithm to get the closest font name to the one requested. * * try fontname * try all aliases for fontname * foreach fallback for fontname * try the fallback * try all aliases for the fallback */ faceName = faPtr->family; if (faceName != NULL) { actualName = FamilyOrAliasExists(hdc, faceName); if (actualName != NULL) { faceName = actualName; goto found; } fontFallbacks = TkFontGetFallbacks(); for (i = 0; fontFallbacks[i] != NULL; i++) { for (j = 0; (fallback = fontFallbacks[i][j]) != NULL; j++) { if (strcasecmp(faceName, fallback) == 0) { break; } } if (fallback != NULL) { for (j = 0; (fallback = fontFallbacks[i][j]) != NULL; j++) { actualName = FamilyOrAliasExists(hdc, fallback); if (actualName != NULL) { faceName = actualName; goto found; } } } } } found: ReleaseDC(hwnd, hdc); hFont = GetScreenFont(faPtr, faceName, TkFontGetPixels(tkwin, faPtr->size)); if (tkFontPtr == NULL) { fontPtr = (WinFont *) ckalloc(sizeof(WinFont)); } else { fontPtr = (WinFont *) tkFontPtr; ReleaseFont(fontPtr); } InitFont(tkwin, hFont, faPtr->overstrike, 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: * None. * * Side effects: * TkFont is deallocated. * *--------------------------------------------------------------------------- */ void TkpDeleteFont( TkFont *tkFontPtr) /* Token of font to be deleted. */ { WinFont *fontPtr; fontPtr = (WinFont *) tkFontPtr; ReleaseFont(fontPtr); } /* *--------------------------------------------------------------------------- * * TkpGetFontFamilies, WinFontFamilyEnumProc -- * * 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. */ { HDC hdc; HWND hwnd; Window window; window = Tk_WindowId(tkwin); hwnd = (window == None) ? NULL : TkWinGetHWND(window); hdc = GetDC(hwnd); /* * On any version NT, there may fonts with international names. * Use the NT-only Unicode version of EnumFontFamilies to get the * font names. If we used the ANSI version on a non-internationalized * version of NT, we would get font names with '?' replacing all * the international characters. * * On a non-internationalized verson of 95, fonts with international * names are not allowed, so the ANSI version of EnumFontFamilies will * work. On an internationalized version of 95, there may be fonts with * international names; the ANSI version will work, fetching the * name in the system code page. Can't use the Unicode version of * EnumFontFamilies because it only exists under NT. */ if (platformId == VER_PLATFORM_WIN32_NT) { EnumFontFamiliesW(hdc, NULL, (FONTENUMPROCW) WinFontFamilyEnumProc, (LPARAM) interp); } else { EnumFontFamiliesA(hdc, NULL, (FONTENUMPROCA) WinFontFamilyEnumProc, (LPARAM) interp); } ReleaseDC(hwnd, hdc); } static int CALLBACK WinFontFamilyEnumProc( ENUMLOGFONT *lfPtr, /* Logical-font data. */ NEWTEXTMETRIC *tmPtr, /* Physical-font data (not used). */ int fontType, /* Type of font (not used). */ LPARAM lParam) /* Result object to hold result. */ { char *faceName; Tcl_DString faceString; Tcl_Obj *strPtr; Tcl_Interp *interp; interp = (Tcl_Interp *) lParam; faceName = lfPtr->elfLogFont.lfFaceName; Tcl_ExternalToUtfDString(systemEncoding, faceName, -1, &faceString); strPtr = Tcl_NewStringObj(Tcl_DStringValue(&faceString), Tcl_DStringLength(&faceString)); Tcl_ListObjAppendElement(NULL, Tcl_GetObjResult(interp), strPtr); Tcl_DStringFree(&faceString); return 1; } /* *------------------------------------------------------------------------- * * TkpGetSubFonts -- * * A function used by the testing package for querying the actual * screen fonts that make up a font object. * * Results: * Modifies interp's result object to hold a list containing the * names of the screen fonts that make up the given font object. * * Side effects: * None. * *------------------------------------------------------------------------- */ void TkpGetSubFonts( Tcl_Interp *interp, /* Interp to hold result. */ Tk_Font tkfont) /* Font object to query. */ { int i; WinFont *fontPtr; FontFamily *familyPtr; Tcl_Obj *resultPtr, *strPtr; resultPtr = Tcl_GetObjResult(interp); fontPtr = (WinFont *) tkfont; for (i = 0; i < fontPtr->numSubFonts; i++) { familyPtr = fontPtr->subFontArray[i].familyPtr; strPtr = Tcl_NewStringObj(familyPtr->faceName, -1); Tcl_ListObjAppendElement(NULL, resultPtr, strPtr); } } /* *--------------------------------------------------------------------------- * * Tk_MeasureChars -- * * Determine the number of bytes from the string that will fit * in the given horizontal span. The measurement is done under the * assumption that Tk_DrawChars() will be used to actually display * the characters. * * Results: * The return value is the number of bytes from source that * fit into the span that extends from 0 to maxLength. *lengthPtr is * filled with the x-coordinate of the right edge of the last * character that did fit. * * Side effects: * None. * *--------------------------------------------------------------------------- */ int Tk_MeasureChars( Tk_Font tkfont, /* Font in which characters will be drawn. */ CONST char *source, /* UTF-8 string to be displayed. Need not be * '\0' terminated. */ int numBytes, /* Maximum number of bytes to consider * from source string. */ int maxLength, /* If >= 0, maxLength specifies the longest * permissible line length in pixels; don't * consider any character that would cross * this x-position. If < 0, then line length * is unbounded and the flags argument is * ignored. */ int flags, /* Various flag bits OR-ed together: * TK_PARTIAL_OK means include the last char * which only partially fit on this line. * TK_WHOLE_WORDS means stop on a word * boundary, if possible. * TK_AT_LEAST_ONE means return at least one * character even if no characters fit. */ int *lengthPtr) /* Filled with x-location just after the * terminating character. */ { HDC hdc; HFONT oldFont; WinFont *fontPtr; int curX, curByte; SubFont *lastSubFontPtr; /* * According to Microsoft tech support, Windows does not use kerning * or fractional character widths when displaying text on the screen. * So that means we can safely measure individual characters or spans * of characters and add up the widths w/o any "off-by-one-pixel" * errors. */ fontPtr = (WinFont *) tkfont; hdc = GetDC(fontPtr->hwnd); lastSubFontPtr = &fontPtr->subFontArray[0]; oldFont = SelectObject(hdc, lastSubFontPtr->hFont); if (numBytes == 0) { curX = 0; curByte = 0; } else if (maxLength < 0) { Tcl_UniChar ch; SIZE size; FontFamily *familyPtr; Tcl_DString runString; SubFont *thisSubFontPtr; CONST char *p, *end, *next; /* * A three step process: * 1. Find a contiguous range of characters that can all be * represented by a single screen font. * 2. Convert those chars to the encoding of that font. * 3. Measure converted chars. */ curX = 0; end = source + numBytes; for (p = source; p < end; ) { next = p + Tcl_UtfToUniChar(p, &ch); thisSubFontPtr = FindSubFontForChar(fontPtr, ch); if (thisSubFontPtr != lastSubFontPtr) { familyPtr = lastSubFontPtr->familyPtr; Tcl_UtfToExternalDString(familyPtr->encoding, source, p - source, &runString); (*familyPtr->getTextExtentPoint32Proc)(hdc, Tcl_DStringValue(&runString), Tcl_DStringLength(&runString) >> familyPtr->isWideFont, &size); curX += size.cx; Tcl_DStringFree(&runString); lastSubFontPtr = thisSubFontPtr; source = p; SelectObject(hdc, lastSubFontPtr->hFont); } p = next; } familyPtr = lastSubFontPtr->familyPtr; Tcl_UtfToExternalDString(familyPtr->encoding, source, p - source, &runString); (*familyPtr->getTextExtentPoint32Proc)(hdc, Tcl_DStringValue(&runString), Tcl_DStringLength(&runString) >> familyPtr->isWideFont, &size); curX += size.cx; Tcl_DStringFree(&runString); curByte = numBytes; } else { Tcl_UniChar ch; SIZE size; char buf[16]; FontFamily *familyPtr; SubFont *thisSubFontPtr; CONST char *term, *end, *p, *next; int newX, termX, sawNonSpace, srcRead, dstWrote; /* * How many chars will fit in the space allotted? * This first version may be inefficient because it measures * every character individually. There is a function call that * can measure multiple characters at once and return the * offset of each of them, but it only works on NT, even though * the documentation claims it works for 95. * TODO: verify that GetTextExtentExPoint is still broken in '95, and * possibly use it for NT anyway since it should be much faster and * more accurate. */ next = source + Tcl_UtfToUniChar(source, &ch); newX = curX = termX = 0; term = source; end = source + numBytes; sawNonSpace = (ch > 255) || !isspace(ch); for (p = source; ; ) { if (ch < BASE_CHARS) { newX += fontPtr->widths[ch]; } else { thisSubFontPtr = FindSubFontForChar(fontPtr, ch); if (thisSubFontPtr != lastSubFontPtr) { SelectObject(hdc, thisSubFontPtr->hFont); lastSubFontPtr = thisSubFontPtr; } familyPtr = lastSubFontPtr->familyPtr; Tcl_UtfToExternal(NULL, familyPtr->encoding, p, next - p, 0, NULL, buf, sizeof(buf), &srcRead, &dstWrote, NULL); (*familyPtr->getTextExtentPoint32Proc)(hdc, buf, dstWrote >> familyPtr->isWideFont, &size); newX += size.cx; } if (newX > maxLength) { break; } curX = newX; p = next; if (p >= end) { term = end; termX = curX; break; } next += Tcl_UtfToUniChar(next, &ch); if ((ch < 256) && isspace(ch)) { if (sawNonSpace) { term = p; termX = curX; sawNonSpace = 0; } } else { sawNonSpace = 1; } } /* * P points to the first character that doesn't fit in the desired * span. Use the flags to figure out what to return. */ if ((flags & TK_PARTIAL_OK) && (p < end) && (curX < maxLength)) { /* * Include the first character that didn't quite fit in the desired * span. The width returned will include the width of that extra * character. */ curX = newX; p += Tcl_UtfToUniChar(p, &ch); } if ((flags & TK_AT_LEAST_ONE) && (term == source) && (p < end)) { term = p; termX = curX; if (term == source) { term += Tcl_UtfToUniChar(term, &ch); termX = newX; } } else if ((p >= end) || !(flags & TK_WHOLE_WORDS)) { term = p; termX = curX; } curX = termX; curByte = term - source; } SelectObject(hdc, oldFont); ReleaseDC(fontPtr->hwnd, hdc); *lengthPtr = curX; return curByte; } /* *--------------------------------------------------------------------------- * * Tk_DrawChars -- * * Draw a string of characters on the screen. * * Results: * None. * * Side effects: * Information gets drawn on the screen. * *--------------------------------------------------------------------------- */ void Tk_DrawChars( Display *display, /* Display on which to draw. */ Drawable drawable, /* Window or pixmap in which to draw. */ GC gc, /* Graphics context for drawing characters. */ Tk_Font tkfont, /* Font in which characters will be drawn; * must be the same as font used in GC. */ CONST char *source, /* UTF-8 string to be displayed. Need not be * '\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 * string when drawing. */ { HDC dc; WinFont *fontPtr; TkWinDCState state; fontPtr = (WinFont *) gc->font; display->request++; if (drawable == None) { return; } dc = TkWinGetDrawableDC(display, drawable, &state); SetROP2(dc, tkpWinRopModes[gc->function]); if ((gc->fill_style == FillStippled || gc->fill_style == FillOpaqueStippled) && gc->stipple != None) { TkWinDrawable *twdPtr = (TkWinDrawable *)gc->stipple; HBRUSH oldBrush, stipple; HBITMAP oldBitmap, bitmap; HDC dcMem; TEXTMETRIC tm; SIZE size; if (twdPtr->type != TWD_BITMAP) { panic("unexpected drawable type in stipple"); } /* * Select stipple pattern into destination dc. */ dcMem = CreateCompatibleDC(dc); stipple = CreatePatternBrush(twdPtr->bitmap.handle); SetBrushOrgEx(dc, gc->ts_x_origin, gc->ts_y_origin, NULL); oldBrush = SelectObject(dc, stipple); SetTextAlign(dcMem, TA_LEFT | TA_BASELINE); SetTextColor(dcMem, gc->foreground); SetBkMode(dcMem, TRANSPARENT); SetBkColor(dcMem, RGB(0, 0, 0)); /* * Compute the bounding box and create a compatible bitmap. */ GetTextExtentPoint(dcMem, source, numBytes, &size); GetTextMetrics(dcMem, &tm); size.cx -= tm.tmOverhang; bitmap = CreateCompatibleBitmap(dc, size.cx, size.cy); oldBitmap = SelectObject(dcMem, bitmap); /* * The following code is tricky because fonts are rendered in multiple * colors. First we draw onto a black background and copy the white * bits. Then we draw onto a white background and copy the black bits. * Both the foreground and background bits of the font are ANDed with * the stipple pattern as they are copied. */ PatBlt(dcMem, 0, 0, size.cx, size.cy, BLACKNESS); MultiFontTextOut(dc, fontPtr, source, numBytes, x, y); BitBlt(dc, x, y - tm.tmAscent, size.cx, size.cy, dcMem, 0, 0, 0xEA02E9); PatBlt(dcMem, 0, 0, size.cx, size.cy, WHITENESS); MultiFontTextOut(dc, fontPtr, source, numBytes, x, y); BitBlt(dc, x, y - tm.tmAscent, size.cx, size.cy, dcMem, 0, 0, 0x8A0E06); /* * Destroy the temporary bitmap and restore the device context. */ SelectObject(dcMem, oldBitmap); DeleteObject(bitmap); DeleteDC(dcMem); SelectObject(dc, oldBrush); DeleteObject(stipple); } else { SetTextAlign(dc, TA_LEFT | TA_BASELINE); SetTextColor(dc, gc->foreground); SetBkMode(dc, TRANSPARENT); MultiFontTextOut(dc, fontPtr, source, numBytes, x, y); } TkWinReleaseDrawableDC(drawable, dc, &state); } /* *------------------------------------------------------------------------- * * MultiFontTextOut -- * * Helper function for Tk_DrawChars. Draws characters, using the * various screen fonts in fontPtr to draw multilingual characters. * Note: No bidirectional support. * * Results: * None. * * Side effects: * Information gets drawn on the screen. * Contents of fontPtr may be modified if more subfonts were loaded * in order to draw all the multilingual characters in the given * string. * *------------------------------------------------------------------------- */ static void MultiFontTextOut( HDC hdc, /* HDC to draw into. */ WinFont *fontPtr, /* Contains set of fonts to use when drawing * following string. */ CONST char *source, /* Potentially multilingual UTF-8 string. */ int numBytes, /* Length of string in bytes. */ int x, int y) /* Coordinates at which to place origin * * of string when drawing. */ { Tcl_UniChar ch; SIZE size; HFONT oldFont; FontFamily *familyPtr; Tcl_DString runString; CONST char *p, *end, *next; SubFont *lastSubFontPtr, *thisSubFontPtr; lastSubFontPtr = &fontPtr->subFontArray[0]; oldFont = SelectObject(hdc, lastSubFontPtr->hFont); end = source + numBytes; for (p = source; p < end; ) { next = p + Tcl_UtfToUniChar(p, &ch); thisSubFontPtr = FindSubFontForChar(fontPtr, ch); if (thisSubFontPtr != lastSubFontPtr) { if (p > source) { familyPtr = lastSubFontPtr->familyPtr; Tcl_UtfToExternalDString(familyPtr->encoding, source, p - source, &runString); (*familyPtr->textOutProc)(hdc, x, y, Tcl_DStringValue(&runString), Tcl_DStringLength(&runString) >> familyPtr->isWideFont); (*familyPtr->getTextExtentPoint32Proc)(hdc, Tcl_DStringValue(&runString), Tcl_DStringLength(&runString) >> familyPtr->isWideFont, &size); x += size.cx; Tcl_DStringFree(&runString); } lastSubFontPtr = thisSubFontPtr; source = p; SelectObject(hdc, lastSubFontPtr->hFont); } p = next; } if (p > source) { familyPtr = lastSubFontPtr->familyPtr; Tcl_UtfToExternalDString(familyPtr->encoding, source, p - source, &runString); (*familyPtr->textOutProc)(hdc, x, y, Tcl_DStringValue(&runString), Tcl_DStringLength(&runString) >> familyPtr->isWideFont); Tcl_DStringFree(&runString); } SelectObject(hdc, oldFont); } /* *--------------------------------------------------------------------------- * * InitFont -- * * Helper for TkpGetNativeFont() and TkpGetFontFromAttributes(). * Initializes the memory for a new WinFont that wraps the * platform-specific data. * * The caller is responsible for initializing the fields of the * WinFont that are used exclusively by the generic TkFont code, and * for releasing those fields before calling TkpDeleteFont(). * * Results: * Fills the WinFont structure. * * Side effects: * Memory allocated. * *--------------------------------------------------------------------------- */ static void InitFont( Tk_Window tkwin, /* Main window of interp in which font will * be used, for getting HDC. */ HFONT hFont, /* Windows token for font. */ int overstrike, /* The overstrike attribute of logfont used * to allocate this font. For some reason, * the TEXTMETRICs may contain incorrect info * in the tmStruckOut field. */ WinFont *fontPtr) /* Filled with information constructed from * the above arguments. */ { HDC hdc; HWND hwnd; HFONT oldFont; TEXTMETRIC tm; Window window; TkFontMetrics *fmPtr; Tcl_Encoding encoding; Tcl_DString faceString; TkFontAttributes *faPtr; char buf[LF_FACESIZE * sizeof(WCHAR)]; window = Tk_WindowId(tkwin); hwnd = (window == None) ? NULL : TkWinGetHWND(window); hdc = GetDC(hwnd); oldFont = SelectObject(hdc, hFont); GetTextMetrics(hdc, &tm); /* * On any version NT, there may fonts with international names. * Use the NT-only Unicode version of GetTextFace to get the font's * name. If we used the ANSI version on a non-internationalized * version of NT, we would get a font name with '?' replacing all * the international characters. * * On a non-internationalized verson of 95, fonts with international * names are not allowed, so the ANSI version of GetTextFace will work. * On an internationalized version of 95, there may be fonts with * international names; the ANSI version will work, fetching the * name in the international system code page. Can't use the Unicode * version of GetTextFace because it only exists under NT. */ if (platformId == VER_PLATFORM_WIN32_NT) { GetTextFaceW(hdc, LF_FACESIZE, (WCHAR *) buf); } else { GetTextFaceA(hdc, LF_FACESIZE, (char *) buf); } Tcl_ExternalToUtfDString(systemEncoding, buf, -1, &faceString); fontPtr->font.fid = (Font) fontPtr; faPtr = &fontPtr->font.fa; faPtr->family = Tk_GetUid(Tcl_DStringValue(&faceString)); faPtr->size = TkFontGetPoints(tkwin, -(tm.tmHeight - tm.tmInternalLeading)); faPtr->weight = (tm.tmWeight > FW_MEDIUM) ? TK_FW_BOLD : TK_FW_NORMAL; faPtr->slant = (tm.tmItalic != 0) ? TK_FS_ITALIC : TK_FS_ROMAN; faPtr->underline = (tm.tmUnderlined != 0) ? 1 : 0; faPtr->overstrike = overstrike; fmPtr = &fontPtr->font.fm; fmPtr->ascent = tm.tmAscent; fmPtr->descent = tm.tmDescent; fmPtr->maxWidth = tm.tmMaxCharWidth; fmPtr->fixed = !(tm.tmPitchAndFamily & TMPF_FIXED_PITCH); fontPtr->hwnd = hwnd; fontPtr->pixelSize = tm.tmHeight - tm.tmInternalLeading; fontPtr->numSubFonts = 1; fontPtr->subFontArray = fontPtr->staticSubFonts; InitSubFont(hdc, hFont, 1, &fontPtr->subFontArray[0]); encoding = fontPtr->subFontArray[0].familyPtr->encoding; if (encoding == unicodeEncoding) { GetCharWidthW(hdc, 0, BASE_CHARS - 1, fontPtr->widths); } else { GetCharWidthA(hdc, 0, BASE_CHARS - 1, fontPtr->widths); } Tcl_DStringFree(&faceString); SelectObject(hdc, oldFont); ReleaseDC(hwnd, hdc); } /* *------------------------------------------------------------------------- * * ReleaseFont -- * * Called to release the windows-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( WinFont *fontPtr) /* The font to delete. */ { int i; for (i = 0; i < fontPtr->numSubFonts; i++) { ReleaseSubFont(&fontPtr->subFontArray[i]); } if (fontPtr->subFontArray != fontPtr->staticSubFonts) { ckfree((char *) fontPtr->subFontArray); } } /* *------------------------------------------------------------------------- * * InitSubFont -- * * Wrap a screen font and load the FontFamily that represents * it. Used to prepare a SubFont so that characters can be mapped * from UTF-8 to the charset of the font. * * Results: * The subFontPtr is filled with information about the font. * * Side effects: * None. * *------------------------------------------------------------------------- */ static void InitSubFont( HDC hdc, /* HDC in which font can be selected. */ HFONT hFont, /* The screen font. */ int base, /* Non-zero if this SubFont is being used * as the base font for a font object. */ SubFont *subFontPtr) /* Filled with SubFont constructed from * above attributes. */ { subFontPtr->hFont = hFont; subFontPtr->familyPtr = AllocFontFamily(hdc, hFont, base); subFontPtr->fontMap = subFontPtr->familyPtr->fontMap; } /* *------------------------------------------------------------------------- * * ReleaseSubFont -- * * Called to release the contents of a SubFont. The caller is * responsible for freeing the memory used by the SubFont itself. * * Results: * None. * * Side effects: * Memory and resources are freed. * *--------------------------------------------------------------------------- */ static void ReleaseSubFont( SubFont *subFontPtr) /* The SubFont to delete. */ { DeleteObject(subFontPtr->hFont); FreeFontFamily(subFontPtr->familyPtr); } /* *------------------------------------------------------------------------- * * AllocFontFamily -- * * Find the FontFamily structure associated with the given font * name. The information should be stored by the caller in a * SubFont and used when determining if that SubFont supports a * character. * * Cannot use the string name used to construct the font as the * key, because the capitalization may not be canonical. Therefore * use the face name actually retrieved from the font metrics as * the key. * * Results: * A pointer to a FontFamily. The reference count in the FontFamily * is automatically incremented. When the SubFont is released, the * reference count is decremented. When no SubFont is using this * FontFamily, it may be deleted. * * Side effects: * A new FontFamily structure will be allocated if this font family * has not been seen. TrueType character existence metrics are * loaded into the FontFamily structure. * *------------------------------------------------------------------------- */ static FontFamily * AllocFontFamily( HDC hdc, /* HDC in which font can be selected. */ HFONT hFont, /* Screen font whose FontFamily is to be * returned. */ int base) /* Non-zero if this font family is to be * used in the base font of a font object. */ { Tk_Uid faceName; FontFamily *familyPtr; Tcl_DString faceString; Tcl_Encoding encoding; char buf[LF_FACESIZE * sizeof(WCHAR)]; ThreadSpecificData *tsdPtr = (ThreadSpecificData *) Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); hFont = SelectObject(hdc, hFont); if (platformId == VER_PLATFORM_WIN32_NT) { GetTextFaceW(hdc, LF_FACESIZE, (WCHAR *) buf); } else { GetTextFaceA(hdc, LF_FACESIZE, (char *) buf); } Tcl_ExternalToUtfDString(systemEncoding, buf, -1, &faceString); faceName = Tk_GetUid(Tcl_DStringValue(&faceString)); Tcl_DStringFree(&faceString); hFont = SelectObject(hdc, hFont); familyPtr = tsdPtr->fontFamilyList; for ( ; familyPtr != NULL; familyPtr = familyPtr->nextPtr) { if (familyPtr->faceName == faceName) { familyPtr->refCount++; return familyPtr; } } familyPtr = (FontFamily *) ckalloc(sizeof(FontFamily)); memset(familyPtr, 0, sizeof(FontFamily)); familyPtr->nextPtr = tsdPtr->fontFamilyList; tsdPtr->fontFamilyList = familyPtr; /* * Set key for this FontFamily. */ familyPtr->faceName = faceName; /* * An initial refCount of 2 means that FontFamily information will * persist even when the SubFont that loaded the FontFamily is released. * Change it to 1 to cause FontFamilies to be unloaded when not in use. */ familyPtr->refCount = 2; familyPtr->segCount = LoadFontRanges(hdc, hFont, &familyPtr->startCount, &familyPtr->endCount, &familyPtr->isSymbolFont); encoding = NULL; if (familyPtr->isSymbolFont != 0) { /* * Symbol fonts are handled specially. For instance, Unicode 0393 * (GREEK CAPITAL GAMMA) must be mapped to Symbol character 0047 * (GREEK CAPITAL GAMMA), because the Symbol font doesn't have a * GREEK CAPITAL GAMMA at location 0393. If Tk interpreted the * Symbol font using the Unicode encoding, it would decide that * the Symbol font has no GREEK CAPITAL GAMMA, because the Symbol * encoding (of course) reports that character 0393 doesn't exist. * * With non-symbol Windows fonts, such as Times New Roman, if the * font has a GREEK CAPITAL GAMMA, it will be found in the correct * Unicode location (0393); the GREEK CAPITAL GAMMA will not be off * hiding at some other location. */ encoding = Tcl_GetEncoding(NULL, faceName); } if (encoding == NULL) { encoding = Tcl_GetEncoding(NULL, "unicode"); familyPtr->textOutProc = (BOOL (WINAPI *)(HDC, int, int, TCHAR *, int)) TextOutW; familyPtr->getTextExtentPoint32Proc = (BOOL (WINAPI *)(HDC, TCHAR *, int, LPSIZE)) GetTextExtentPoint32W; familyPtr->isWideFont = 1; } else { familyPtr->textOutProc = (BOOL (WINAPI *)(HDC, int, int, TCHAR *, int)) TextOutA; familyPtr->getTextExtentPoint32Proc = (BOOL (WINAPI *)(HDC, TCHAR *, int, LPSIZE)) GetTextExtentPoint32A; familyPtr->isWideFont = 0; } familyPtr->encoding = encoding; return familyPtr; } /* *------------------------------------------------------------------------- * * FreeFontFamily -- * * Called to free a FontFamily when the SubFont is finished using it. * Frees the contents of the FontFamily and the memory used by the * FontFamily itself. * * Results: * None. * * Side effects: * None. * *------------------------------------------------------------------------- */ static void FreeFontFamily( FontFamily *familyPtr) /* The FontFamily to delete. */ { int i; FontFamily **familyPtrPtr; ThreadSpecificData *tsdPtr = (ThreadSpecificData *) Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); if (familyPtr == NULL) { return; } familyPtr->refCount--; if (familyPtr->refCount > 0) { return; } for (i = 0; i < FONTMAP_PAGES; i++) { if (familyPtr->fontMap[i] != NULL) { ckfree(familyPtr->fontMap[i]); } } if (familyPtr->startCount != NULL) { ckfree((char *) familyPtr->startCount); } if (familyPtr->endCount != NULL) { ckfree((char *) familyPtr->endCount); } if (familyPtr->encoding != unicodeEncoding) { Tcl_FreeEncoding(familyPtr->encoding); } /* * Delete from list. */ for (familyPtrPtr = &tsdPtr->fontFamilyList; ; ) { if (*familyPtrPtr == familyPtr) { *familyPtrPtr = familyPtr->nextPtr; break; } familyPtrPtr = &(*familyPtrPtr)->nextPtr; } ckfree((char *) familyPtr); } /* *------------------------------------------------------------------------- * * FindSubFontForChar -- * * Determine which screen font is necessary to use to display the * given character. If the font object does not have a screen font * that can display the character, another screen font may be loaded * into the font object, following a set of preferred fallback rules. * * Results: * The return value is the SubFont to use to display the given * character. * * Side effects: * The contents of fontPtr are modified to cache the results * of the lookup and remember any SubFonts that were dynamically * loaded. * *------------------------------------------------------------------------- */ static SubFont * FindSubFontForChar( WinFont *fontPtr, /* The font object with which the character * will be displayed. */ int ch) /* The Unicode character to be displayed. */ { HDC hdc; int i, j, k; CanUse canUse; char **aliases, **anyFallbacks; char ***fontFallbacks; char *fallbackName; SubFont *subFontPtr; Tcl_DString ds; if (ch < BASE_CHARS) { return &fontPtr->subFontArray[0]; } for (i = 0; i < fontPtr->numSubFonts; i++) { if (FontMapLookup(&fontPtr->subFontArray[i], ch)) { return &fontPtr->subFontArray[i]; } } /* * Keep track of all face names that we check, so we don't check some * name multiple times if it can be reached by multiple paths. */ Tcl_DStringInit(&ds); hdc = GetDC(fontPtr->hwnd); aliases = TkFontGetAliasList(fontPtr->font.fa.family); fontFallbacks = TkFontGetFallbacks(); for (i = 0; fontFallbacks[i] != NULL; i++) { for (j = 0; fontFallbacks[i][j] != NULL; j++) { fallbackName = fontFallbacks[i][j]; if (strcasecmp(fallbackName, fontPtr->font.fa.family) == 0) { /* * If the base font has a fallback... */ goto tryfallbacks; } else if (aliases != NULL) { /* * Or if an alias for the base font has a fallback... */ for (k = 0; aliases[k] != NULL; k++) { if (strcasecmp(aliases[k], fallbackName) == 0) { goto tryfallbacks; } } } } continue; /* * ...then see if we can use one of the fallbacks, or an * alias for one of the fallbacks. */ tryfallbacks: for (j = 0; fontFallbacks[i][j] != NULL; j++) { fallbackName = fontFallbacks[i][j]; subFontPtr = CanUseFallbackWithAliases(hdc, fontPtr, fallbackName, ch, &ds); if (subFontPtr != NULL) { goto end; } } } /* * See if we can use something from the global fallback list. */ anyFallbacks = TkFontGetGlobalClass(); for (i = 0; anyFallbacks[i] != NULL; i++) { fallbackName = anyFallbacks[i]; subFontPtr = CanUseFallbackWithAliases(hdc, fontPtr, fallbackName, ch, &ds); if (subFontPtr != NULL) { goto end; } } /* * Try all face names available in the whole system until we * find one that can be used. */ canUse.hdc = hdc; canUse.fontPtr = fontPtr; canUse.nameTriedPtr = &ds; canUse.ch = ch; canUse.subFontPtr = NULL; if (platformId == VER_PLATFORM_WIN32_NT) { EnumFontFamiliesW(hdc, NULL, (FONTENUMPROCW) WinFontCanUseProc, (LPARAM) &canUse); } else { EnumFontFamiliesA(hdc, NULL, (FONTENUMPROCA) WinFontCanUseProc, (LPARAM) &canUse); } subFontPtr = canUse.subFontPtr; end: Tcl_DStringFree(&ds); if (subFontPtr == NULL) { /* * No font can display this character. We will use the base font * and have it display the "unknown" character. */ subFontPtr = &fontPtr->subFontArray[0]; FontMapInsert(subFontPtr, ch); } ReleaseDC(fontPtr->hwnd, hdc); return subFontPtr; } static int CALLBACK WinFontCanUseProc( ENUMLOGFONT *lfPtr, /* Logical-font data. */ NEWTEXTMETRIC *tmPtr, /* Physical-font data (not used). */ int fontType, /* Type of font (not used). */ LPARAM lParam) /* Result object to hold result. */ { int ch; HDC hdc; WinFont *fontPtr; CanUse *canUsePtr; char *fallbackName; SubFont *subFontPtr; Tcl_DString faceString; Tcl_DString *nameTriedPtr; canUsePtr = (CanUse *) lParam; ch = canUsePtr->ch; hdc = canUsePtr->hdc; fontPtr = canUsePtr->fontPtr; nameTriedPtr = canUsePtr->nameTriedPtr; fallbackName = lfPtr->elfLogFont.lfFaceName; Tcl_ExternalToUtfDString(systemEncoding, fallbackName, -1, &faceString); fallbackName = Tcl_DStringValue(&faceString); if (SeenName(fallbackName, nameTriedPtr) == 0) { subFontPtr = CanUseFallback(hdc, fontPtr, fallbackName, ch); if (subFontPtr != NULL) { canUsePtr->subFontPtr = subFontPtr; Tcl_DStringFree(&faceString); return 0; } } Tcl_DStringFree(&faceString); return 1; } /* *------------------------------------------------------------------------- * * FontMapLookup -- * * See if the screen font can display the given character. * * Results: * The return value is 0 if the screen font cannot display the * character, non-zero otherwise. * * Side effects: * New pages are added to the font mapping cache whenever the * character belongs to a page that hasn't been seen before. * When a page is loaded, information about all the characters on * that page is stored, not just for the single character in * question. * *------------------------------------------------------------------------- */ static int FontMapLookup( SubFont *subFontPtr, /* Contains font mapping cache to be queried * and possibly updated. */ int ch) /* Character to be tested. */ { int row, bitOffset; row = ch >> FONTMAP_SHIFT; if (subFontPtr->fontMap[row] == NULL) { FontMapLoadPage(subFontPtr, row); } bitOffset = ch & (FONTMAP_BITSPERPAGE - 1); return (subFontPtr->fontMap[row][bitOffset >> 3] >> (bitOffset & 7)) & 1; } /* *------------------------------------------------------------------------- * * FontMapInsert -- * * Tell the font mapping cache that the given screen font should be * used to display the specified character. This is called when no * font on the system can be be found that can display that * character; we lie to the font and tell it that it can display * the character, otherwise we would end up re-searching the entire * fallback hierarchy every time that character was seen. * * Results: * None. * * Side effects: * New pages are added to the font mapping cache whenever the * character belongs to a page that hasn't been seen before. * When a page is loaded, information about all the characters on * that page is stored, not just for the single character in * question. * *------------------------------------------------------------------------- */ static void FontMapInsert( SubFont *subFontPtr, /* Contains font mapping cache to be * updated. */ int ch) /* Character to be added to cache. */ { int row, bitOffset; row = ch >> FONTMAP_SHIFT; if (subFontPtr->fontMap[row] == NULL) { FontMapLoadPage(subFontPtr, row); } bitOffset = ch & (FONTMAP_BITSPERPAGE - 1); subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7); } /* *------------------------------------------------------------------------- * * FontMapLoadPage -- * * Load information about all the characters on a given page. * This information consists of one bit per character that indicates * whether the associated HFONT can (1) or cannot (0) display the * characters on the page. * * Results: * None. * * Side effects: * Mempry allocated. * *------------------------------------------------------------------------- */ static void FontMapLoadPage( SubFont *subFontPtr, /* Contains font mapping cache to be * updated. */ int row) /* Index of the page to be loaded into * the cache. */ { FontFamily *familyPtr; Tcl_Encoding encoding; char src[TCL_UTF_MAX], buf[16]; USHORT *startCount, *endCount; int i, j, bitOffset, end, segCount; subFontPtr->fontMap[row] = (char *) ckalloc(FONTMAP_BITSPERPAGE / 8); memset(subFontPtr->fontMap[row], 0, FONTMAP_BITSPERPAGE / 8); familyPtr = subFontPtr->familyPtr; encoding = familyPtr->encoding; if (familyPtr->encoding == unicodeEncoding) { /* * Font is Unicode. Few fonts are going to have all characters, so * examine the TrueType character existence metrics to determine * what characters actually exist in this font. */ segCount = familyPtr->segCount; startCount = familyPtr->startCount; endCount = familyPtr->endCount; j = 0; end = (row + 1) << FONTMAP_SHIFT; for (i = row << FONTMAP_SHIFT; i < end; i++) { for ( ; j < segCount; j++) { if (endCount[j] >= i) { if (startCount[j] <= i) { bitOffset = i & (FONTMAP_BITSPERPAGE - 1); subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7); } break; } } } } else if (familyPtr->isSymbolFont) { /* * Assume that a symbol font with a known encoding has all the * characters that its encoding claims it supports. * * The test for "encoding == unicodeEncoding" * must occur before this case, to catch all symbol fonts (such * as {Comic Sans MS} or Wingdings) for which we don't have * encoding information; those symbol fonts are treated as if * they were in the Unicode encoding and their symbolic * character existence metrics are treated as if they were Unicode * character existence metrics. This way, although we don't know * the proper Unicode -> symbol font mapping, we can install the * symbol font as the base font and access its glyphs. */ end = (row + 1) << FONTMAP_SHIFT; for (i = row << FONTMAP_SHIFT; i < end; i++) { if (Tcl_UtfToExternal(NULL, encoding, src, Tcl_UniCharToUtf(i, src), TCL_ENCODING_STOPONERROR, NULL, buf, sizeof(buf), NULL, NULL, NULL) != TCL_OK) { continue; } bitOffset = i & (FONTMAP_BITSPERPAGE - 1); subFontPtr->fontMap[row][bitOffset >> 3] |= 1 << (bitOffset & 7); } } } /* *--------------------------------------------------------------------------- * * CanUseFallbackWithAliases -- * * Helper function for FindSubFontForChar. Determine if the * specified face name (or an alias of the specified face name) * can be used to construct a screen font that can display the * given character. * * Results: * See CanUseFallback(). * * Side effects: * If the name and/or one of its aliases was rejected, the * rejected string is recorded in nameTriedPtr so that it won't * be tried again. * *--------------------------------------------------------------------------- */ static SubFont * CanUseFallbackWithAliases( HDC hdc, /* HDC in which font can be selected. */ WinFont *fontPtr, /* The font object that will own the new * screen font. */ char *faceName, /* Desired face name for new screen font. */ int ch, /* The Unicode character that the new * screen font must be able to display. */ Tcl_DString *nameTriedPtr) /* Records face names that have already * been tried. It is possible for the same * face name to be queried multiple times when * trying to find a suitable screen font. */ { int i; char **aliases; SubFont *subFontPtr; if (SeenName(faceName, nameTriedPtr) == 0) { subFontPtr = CanUseFallback(hdc, fontPtr, faceName, ch); if (subFontPtr != NULL) { return subFontPtr; } } aliases = TkFontGetAliasList(faceName); if (aliases != NULL) { for (i = 0; aliases[i] != NULL; i++) { if (SeenName(aliases[i], nameTriedPtr) == 0) { subFontPtr = CanUseFallback(hdc, fontPtr, aliases[i], ch); if (subFontPtr != NULL) { return subFontPtr; } } } } return NULL; } /* *--------------------------------------------------------------------------- * * SeenName -- * * Used to determine we have already tried and rejected the given * face name when looking for a screen font that can support some * Unicode character. * * Results: * The return value is 0 if this face name has not already been seen, * non-zero otherwise. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static int SeenName( CONST char *name, /* The name to check. */ Tcl_DString *dsPtr) /* Contains names that have already been * seen. */ { CONST char *seen, *end; seen = Tcl_DStringValue(dsPtr); end = seen + Tcl_DStringLength(dsPtr); while (seen < end) { if (strcasecmp(seen, name) == 0) { return 1; } seen += strlen(seen) + 1; } Tcl_DStringAppend(dsPtr, (char *) name, (int) (strlen(name) + 1)); return 0; } /* *------------------------------------------------------------------------- * * CanUseFallback -- * * If the specified screen font has not already been loaded into * the font object, determine if it can display the given character. * * Results: * The return value is a pointer to a newly allocated SubFont, owned * by the font object. This SubFont can be used to display the given * character. The SubFont represents the screen font with the base set * of font attributes from the font object, but using the specified * font name. NULL is returned if the font object already holds * a reference to the specified physical font or if the specified * physical font cannot display the given character. * * Side effects: * The font object's subFontArray is updated to contain a reference * to the newly allocated SubFont. * *------------------------------------------------------------------------- */ static SubFont * CanUseFallback( HDC hdc, /* HDC in which font can be selected. */ WinFont *fontPtr, /* The font object that will own the new * screen font. */ char *faceName, /* Desired face name for new screen font. */ int ch) /* The Unicode character that the new * screen font must be able to display. */ { int i; HFONT hFont; SubFont subFont; if (FamilyExists(hdc, faceName) == 0) { return NULL; } /* * Skip all fonts we've already used. */ for (i = 0; i < fontPtr->numSubFonts; i++) { if (faceName == fontPtr->subFontArray[i].familyPtr->faceName) { return NULL; } } /* * Load this font and see if it has the desired character. */ hFont = GetScreenFont(&fontPtr->font.fa, faceName, fontPtr->pixelSize); InitSubFont(hdc, hFont, 0, &subFont); if (((ch < 256) && (subFont.familyPtr->isSymbolFont)) || (FontMapLookup(&subFont, ch) == 0)) { /* * Don't use a symbol font as a fallback font for characters below * 256. */ ReleaseSubFont(&subFont); return NULL; } if (fontPtr->numSubFonts >= SUBFONT_SPACE) { SubFont *newPtr; newPtr = (SubFont *) ckalloc(sizeof(SubFont) * (fontPtr->numSubFonts + 1)); memcpy((char *) newPtr, fontPtr->subFontArray, fontPtr->numSubFonts * sizeof(SubFont)); if (fontPtr->subFontArray != fontPtr->staticSubFonts) { ckfree((char *) fontPtr->subFontArray); } fontPtr->subFontArray = newPtr; } fontPtr->subFontArray[fontPtr->numSubFonts] = subFont; fontPtr->numSubFonts++; return &fontPtr->subFontArray[fontPtr->numSubFonts - 1]; } /* *--------------------------------------------------------------------------- * * GetScreenFont -- * * Given the name and other attributes, construct an HFONT. * This is where all the alias and fallback substitution bottoms * out. * * Results: * The screen font that corresponds to the attributes. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static HFONT GetScreenFont( CONST TkFontAttributes *faPtr, /* Desired font attributes for new HFONT. */ CONST char *faceName, /* Overrides font family specified in font * attributes. */ int pixelSize) /* Overrides size specified in font * attributes. */ { Tcl_DString ds; HFONT hFont; LOGFONTW lf; lf.lfHeight = -pixelSize; lf.lfWidth = 0; lf.lfEscapement = 0; lf.lfOrientation = 0; lf.lfWeight = (faPtr->weight == TK_FW_NORMAL) ? FW_NORMAL : FW_BOLD; lf.lfItalic = faPtr->slant; lf.lfUnderline = faPtr->underline; lf.lfStrikeOut = faPtr->overstrike; lf.lfCharSet = DEFAULT_CHARSET; lf.lfOutPrecision = OUT_TT_PRECIS; lf.lfClipPrecision = CLIP_DEFAULT_PRECIS; lf.lfQuality = DEFAULT_QUALITY; lf.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE; Tcl_UtfToExternalDString(systemEncoding, faceName, -1, &ds); if (platformId == VER_PLATFORM_WIN32_NT) { Tcl_UniChar *src, *dst; src = (Tcl_UniChar *) Tcl_DStringValue(&ds); dst = (Tcl_UniChar *) lf.lfFaceName; while (*src != '\0') { *dst++ = *src++; } *dst = '\0'; hFont = CreateFontIndirectW(&lf); } else { strcpy((char *) lf.lfFaceName, Tcl_DStringValue(&ds)); hFont = CreateFontIndirectA((LOGFONTA *) &lf); } Tcl_DStringFree(&ds); return hFont; } /* *------------------------------------------------------------------------- * * FamilyExists, FamilyOrAliasExists, WinFontExistsProc -- * * Determines if any physical screen font exists on the system with * the given family name. If the family exists, then it should be * possible to construct some physical screen font with that family * name. * * Results: * The return value is 0 if the specified font family does not exist, * non-zero otherwise. * * Side effects: * None. * *------------------------------------------------------------------------- */ static int FamilyExists( HDC hdc, /* HDC in which font family will be used. */ CONST char *faceName) /* Font family to query. */ { int result; Tcl_DString faceString; /* * Just immediately rule out the following fonts, because they look so * ugly on windows. The caller's fallback mechanism will cause the * corresponding appropriate TrueType fonts to be selected. */ if (strcasecmp(faceName, "Courier") == 0) { return 0; } if (strcasecmp(faceName, "Times") == 0) { return 0; } if (strcasecmp(faceName, "Helvetica") == 0) { return 0; } Tcl_UtfToExternalDString(systemEncoding, faceName, -1, &faceString); /* * If the family exists, WinFontExistProc() will be called and * EnumFontFamilies() will return whatever WinFontExistProc() returns. * If the family doesn't exist, EnumFontFamilies() will just return a * non-zero value. */ if (platformId == VER_PLATFORM_WIN32_NT) { result = EnumFontFamiliesW(hdc, (WCHAR *) Tcl_DStringValue(&faceString), (FONTENUMPROCW) WinFontExistProc, 0); } else { result = EnumFontFamiliesA(hdc, (char *) Tcl_DStringValue(&faceString), (FONTENUMPROCA) WinFontExistProc, 0); } Tcl_DStringFree(&faceString); return (result == 0); } static char * FamilyOrAliasExists( HDC hdc, CONST char *faceName) { char **aliases; int i; if (FamilyExists(hdc, faceName) != 0) { return (char *) faceName; } aliases = TkFontGetAliasList(faceName); if (aliases != NULL) { for (i = 0; aliases[i] != NULL; i++) { if (FamilyExists(hdc, aliases[i]) != 0) { return aliases[i]; } } } return NULL; } static int CALLBACK WinFontExistProc( ENUMLOGFONT *lfPtr, /* Logical-font data. */ NEWTEXTMETRIC *tmPtr, /* Physical-font data (not used). */ int fontType, /* Type of font (not used). */ LPARAM lParam) /* EnumFontData to hold result. */ { return 0; } /* * The following data structures are used when querying a TrueType font file * to determine which characters the font supports. */ #pragma pack(1) /* Structures are byte aligned in file. */ #define CMAPHEX 0x636d6170 /* Key for character map resource. */ typedef struct CMAPTABLE { USHORT version; /* Table version number (0). */ USHORT numTables; /* Number of encoding tables following. */ } CMAPTABLE; typedef struct ENCODINGTABLE { USHORT platform; /* Platform for which data is targeted. * 3 means data is for Windows. */ USHORT encoding; /* How characters in font are encoded. * 1 means that the following subtable is * keyed based on Unicode. */ ULONG offset; /* Byte offset from beginning of CMAPTABLE * to the subtable for this encoding. */ } ENCODINGTABLE; typedef struct ANYTABLE { USHORT format; /* Format number. */ USHORT length; /* The actual length in bytes of this * subtable. */ USHORT version; /* Version number (starts at 0). */ } ANYTABLE; typedef struct BYTETABLE { USHORT format; /* Format number is set to 0. */ USHORT length; /* The actual length in bytes of this * subtable. */ USHORT version; /* Version number (starts at 0). */ BYTE glyphIdArray[256]; /* Array that maps up to 256 single-byte char * codes to glyph indices. */ } BYTETABLE; typedef struct SUBHEADER { USHORT firstCode; /* First valid low byte for subHeader. */ USHORT entryCount; /* Number valid low bytes for subHeader. */ SHORT idDelta; /* Constant adder to get base glyph index. */ USHORT idRangeOffset; /* Byte offset from here to appropriate * glyphIndexArray. */ } SUBHEADER; typedef struct HIBYTETABLE { USHORT format; /* Format number is set to 2. */ USHORT length; /* The actual length in bytes of this * subtable. */ USHORT version; /* Version number (starts at 0). */ USHORT subHeaderKeys[256]; /* Maps high bytes to subHeaders: value is * subHeader index * 8. */ #if 0 SUBHEADER subHeaders[]; /* Variable-length array of SUBHEADERs. */ USHORT glyphIndexArray[]; /* Variable-length array containing subarrays * used for mapping the low byte of 2-byte * characters. */ #endif } HIBYTETABLE; typedef struct SEGMENTTABLE { USHORT format; /* Format number is set to 4. */ USHORT length; /* The actual length in bytes of this * subtable. */ USHORT version; /* Version number (starts at 0). */ USHORT segCountX2; /* 2 x segCount. */ USHORT searchRange; /* 2 x (2**floor(log2(segCount))). */ USHORT entrySelector; /* log2(searchRange/2). */ USHORT rangeShift; /* 2 x segCount - searchRange. */ #if 0 USHORT endCount[segCount] /* End characterCode for each segment. */ USHORT reservedPad; /* Set to 0. */ USHORT startCount[segCount];/* Start character code for each segment. */ USHORT idDelta[segCount]; /* Delta for all character in segment. */ USHORT idRangeOffset[segCount]; /* Offsets into glyphIdArray or 0. */ USHORT glyphIdArray[] /* Glyph index array. */ #endif } SEGMENTTABLE; typedef struct TRIMMEDTABLE { USHORT format; /* Format number is set to 6. */ USHORT length; /* The actual length in bytes of this * subtable. */ USHORT version; /* Version number (starts at 0). */ USHORT firstCode; /* First character code of subrange. */ USHORT entryCount; /* Number of character codes in subrange. */ #if 0 USHORT glyphIdArray[]; /* Array of glyph index values for character codes in the range. */ #endif } TRIMMEDTABLE; typedef union SUBTABLE { ANYTABLE any; BYTETABLE byte; HIBYTETABLE hiByte; SEGMENTTABLE segment; TRIMMEDTABLE trimmed; } SUBTABLE; #pragma pack() /* *------------------------------------------------------------------------- * * LoadFontRanges -- * * Given an HFONT, get the information about the characters that * this font can display. * * Results: * If the font has no Unicode character information, the return value * is 0 and *startCountPtr and *endCountPtr are filled with NULL. * Otherwise, *startCountPtr and *endCountPtr are set to pointers to * arrays of TrueType character existence information and the return * value is the length of the arrays (the two arrays are always the * same length as each other). * * Side effects: * None. * *------------------------------------------------------------------------- */ static int LoadFontRanges( HDC hdc, /* HDC into which font can be selected. */ HFONT hFont, /* HFONT to query. */ USHORT **startCountPtr, /* Filled with malloced pointer to * character range information. */ USHORT **endCountPtr, /* Filled with malloced pointer to * character range information. */ int *symbolPtr) { int n, i, swapped, offset, cbData, segCount; DWORD cmapKey; USHORT *startCount, *endCount; CMAPTABLE cmapTable; ENCODINGTABLE encTable; SUBTABLE subTable; char *s; segCount = 0; startCount = NULL; endCount = NULL; *symbolPtr = 0; hFont = SelectObject(hdc, hFont); i = 0; s = (char *) &i; *s = '\1'; swapped = 0; if (i == 1) { swapped = 1; } cmapKey = CMAPHEX; if (swapped) { SwapLong(&cmapKey); } n = GetFontData(hdc, cmapKey, 0, &cmapTable, sizeof(cmapTable)); if (n != GDI_ERROR) { if (swapped) { SwapShort(&cmapTable.numTables); } for (i = 0; i < cmapTable.numTables; i++) { offset = sizeof(cmapTable) + i * sizeof(encTable); GetFontData(hdc, cmapKey, offset, &encTable, sizeof(encTable)); if (swapped) { SwapShort(&encTable.platform); SwapShort(&encTable.encoding); SwapLong(&encTable.offset); } if (encTable.platform != 3) { /* * Not Microsoft encoding. */ continue; } if (encTable.encoding == 0) { *symbolPtr = 1; } else if (encTable.encoding != 1) { continue; } GetFontData(hdc, cmapKey, encTable.offset, &subTable, sizeof(subTable)); if (swapped) { SwapShort(&subTable.any.format); } if (subTable.any.format == 4) { if (swapped) { SwapShort(&subTable.segment.segCountX2); } segCount = subTable.segment.segCountX2 / 2; cbData = segCount * sizeof(USHORT); startCount = (USHORT *) ckalloc(cbData); endCount = (USHORT *) ckalloc(cbData); offset = encTable.offset + sizeof(subTable.segment); GetFontData(hdc, cmapKey, offset, endCount, cbData); offset += cbData + sizeof(USHORT); GetFontData(hdc, cmapKey, offset, startCount, cbData); if (swapped) { for (i = 0; i < segCount; i++) { SwapShort(&endCount[i]); SwapShort(&startCount[i]); } } if (*symbolPtr != 0) { /* * Empirically determined: When a symbol font is * loaded, the character existence metrics obtained * from the system are mildly wrong. If the real range * of the symbol font is from 0020 to 00FE, then the * metrics are reported as F020 to F0FE. When we load * a symbol font, we must fix the character existence * metrics. */ for (i = 0; i < segCount; i++) { if ((startCount[i] & 0xff00) == 0xf000) { startCount[i] &= 0xff; } if ((endCount[i] & 0xff00) == 0xf000) { endCount[i] &= 0xff; } } } } } } SelectObject(hdc, hFont); *startCountPtr = startCount; *endCountPtr = endCount; return segCount; } /* *------------------------------------------------------------------------- * * SwapShort, SwapLong -- * * Helper functions to convert the data loaded from TrueType font * files to Intel byte ordering. * * Results: * Bytes of input value are swapped and stored back in argument. * * Side effects: * None. * *------------------------------------------------------------------------- */ static void SwapShort(PUSHORT p) { *p = (SHORT)(HIBYTE(*p) + (LOBYTE(*p) << 8)); } static void SwapLong(PULONG p) { ULONG temp; temp = (LONG) ((BYTE) *p); temp <<= 8; *p >>=8; temp += (LONG) ((BYTE) *p); temp <<= 8; *p >>=8; temp += (LONG) ((BYTE) *p); temp <<= 8; *p >>=8; temp += (LONG) ((BYTE) *p); *p = temp; }