* Contains the Windows implementation of the platform-independant
* font package interface.
*
- * Copyright (c) 1995-1997 Sun Microsystems, Inc.
* 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.
#include "tkFont.h"
/*
- * The following structure represents Windows' implementation of a font.
+ * 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. */
- HFONT hFont; /* Windows information about font. */
+ 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. */
+ * 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 used as to map between the Tcl strings
- * that represent the system fonts and the numbers used by Windows.
+ * 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[] = {
{-1, NULL}
};
-/* CYGNUS LOCAL: Map magic windows font names into offsets into a
- NONCLIENTMETRICS structure. */
+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;
-static TkStateMap nonClientMap[] = {
- {Tk_Offset(NONCLIENTMETRICS, lfCaptionFont), "caption"},
- {Tk_Offset(NONCLIENTMETRICS, lfSmCaptionFont), "smcaption"},
- {Tk_Offset(NONCLIENTMETRICS, lfMenuFont), "menu"},
- {Tk_Offset(NONCLIENTMETRICS, lfStatusFont), "status"},
- {Tk_Offset(NONCLIENTMETRICS, lfMessageFont), "message"},
- {-1, NULL}
-};
+/*
+ * Information cached about the system at startup time.
+ */
+
+static Tcl_Encoding unicodeEncoding;
+static Tcl_Encoding systemEncoding;
+
+/*
+ * Procedures used only in this file.
+ */
-#define ABS(x) (((x) < 0) ? -(x) : (x))
+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);
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * TkpFontPkgInit --
+ *
+ * This procedure is called when an application is created. It
+ * initializes all the structures that are used by the
+ * platform-dependent code on a per application basis.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ *
+ * None.
+ *
+ *-------------------------------------------------------------------------
+ */
-static TkFont * AllocFont _ANSI_ARGS_((TkFont *tkFontPtr,
- Tk_Window tkwin, HFONT hFont));
-static char * GetProperty _ANSI_ARGS_((CONST TkFontAttributes *faPtr,
- CONST char *option));
-static int CALLBACK WinFontFamilyEnumProc _ANSI_ARGS_((ENUMLOGFONT *elfPtr,
- NEWTEXTMETRIC *ntmPtr, int fontType,
- LPARAM lParam));
+void
+TkpFontPkgInit(
+ TkMainInfo *mainPtr) /* The application being created. */
+{
+ unicodeEncoding = Tcl_GetEncoding(NULL, "unicode");
+ if (TkWinGetPlatformId() == 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.
+ */
-/* CYGNUS LOCAL: New static function. */
-static int FontChanged _ANSI_ARGS_((TkFontAttributes *faPtr));
+ systemEncoding = unicodeEncoding;
+ }
+}
\f
/*
*---------------------------------------------------------------------------
* the contents of the generic TkFont before calling TkpDeleteFont().
*
* Side effects:
- * None.
+ * Memory allocated.
*
*---------------------------------------------------------------------------
*/
TkFont *
-TkpGetNativeFont(tkwin, name)
- Tk_Window tkwin; /* For display where font will be used. */
- CONST char *name; /* Platform-specific font name. */
+TkpGetNativeFont(
+ Tk_Window tkwin, /* For display where font will be used. */
+ CONST char *name) /* Platform-specific font name. */
{
int object;
- HFONT hFont;
-
+ WinFont *fontPtr;
+
object = TkFindStateNum(NULL, NULL, systemMap, name);
if (object < 0) {
return NULL;
}
- hFont = GetStockObject(object);
- if (hFont == NULL) {
- panic("TkpGetNativeFont: can't allocate stock font");
- }
- return AllocFont(NULL, tkwin, hFont);
+ tkwin = (Tk_Window) ((TkWindow *) tkwin)->mainPtr->winPtr;
+ fontPtr = (WinFont *) ckalloc(sizeof(WinFont));
+ InitFont(tkwin, GetStockObject(object), 0, fontPtr);
+
+ return (TkFont *) fontPtr;
}
\f
/*
* the contents of the generic TkFont before calling TkpDeleteFont().
*
* Side effects:
- * None.
+ * Memory allocated.
*
*---------------------------------------------------------------------------
*/
+
TkFont *
-TkpGetFontFromAttributes(tkFontPtr, tkwin, faPtr)
- TkFont *tkFontPtr; /* If non-NULL, store the information in
+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. */
+ Tk_Window tkwin, /* For display where font will be used. */
+ CONST TkFontAttributes *faPtr)
+ /* Set of attributes to match. */
{
- int offset;
- LOGFONT lf;
+ int i, j;
+ HDC hdc;
+ HWND hwnd;
HFONT hFont;
Window window;
- HWND hwnd;
- HDC hdc;
-
- /* CYGNUS LOCAL: Magic handling for fonts in the windows-* family. */
- if (faPtr->family != NULL
- && strncmp(faPtr->family, "windows-", 8) == 0
- && (offset = TkFindStateNum(NULL, NULL, nonClientMap,
- faPtr->family + 8)) >= 0) {
- NONCLIENTMETRICS ncm;
-
- ncm.cbSize = sizeof(ncm);
- if (! SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(ncm),
- (void *) &ncm, 0)) {
- panic("TkpGetFontFromAttributes: SystemParametersInfo failed");
- }
-
- lf = *(LOGFONT *)((char *) &ncm + offset);
- } else {
- window = Tk_WindowId(((TkWindow *) tkwin)->mainPtr->winPtr);
- hwnd = (window == None) ? NULL : TkWinGetHWND(window);
-
- hdc = GetDC(hwnd);
- lf.lfHeight = -faPtr->pointsize;
- if (lf.lfHeight < 0) {
- lf.lfHeight = MulDiv(lf.lfHeight,
- 254 * WidthOfScreen(Tk_Screen(tkwin)),
- 720 * WidthMMOfScreen(Tk_Screen(tkwin)));
+ 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;
}
- 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_DEFAULT_PRECIS;
- lf.lfClipPrecision = CLIP_DEFAULT_PRECIS;
- lf.lfQuality = DEFAULT_QUALITY;
- lf.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;
- if (faPtr->family == NULL) {
- lf.lfFaceName[0] = '\0';
- } else {
- lstrcpyn(lf.lfFaceName, faPtr->family, sizeof(lf.lfFaceName));
+ 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;
+ }
+ }
+ }
}
- ReleaseDC(hwnd, hdc);
+ }
- /*
- * Replace the standard X and Mac family names with the names that
- * Windows likes.
- */
+ found:
+ ReleaseDC(hwnd, hdc);
- if ((stricmp(lf.lfFaceName, "Times") == 0)
- || (stricmp(lf.lfFaceName, "New York") == 0)) {
- strcpy(lf.lfFaceName, "Times New Roman");
- } else if ((stricmp(lf.lfFaceName, "Courier") == 0)
- || (stricmp(lf.lfFaceName, "Monaco") == 0)) {
- strcpy(lf.lfFaceName, "Courier New");
- } else if ((stricmp(lf.lfFaceName, "Helvetica") == 0)
- || (stricmp(lf.lfFaceName, "Geneva") == 0)) {
- strcpy(lf.lfFaceName, "Arial");
- }
+ 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);
- hFont = CreateFontIndirect(&lf);
- if (hFont == NULL) {
- hFont = GetStockObject(SYSTEM_FONT);
- if (hFont == NULL) {
- panic("TkpGetFontFromAttributes: cannot get system font");
- }
- }
- return AllocFont(tkFontPtr, tkwin, hFont);
+ return (TkFont *) fontPtr;
}
\f
/*
*/
void
-TkpDeleteFont(tkFontPtr)
- TkFont *tkFontPtr; /* Token of font to be deleted. */
+TkpDeleteFont(
+ TkFont *tkFontPtr) /* Token of font to be deleted. */
{
WinFont *fontPtr;
fontPtr = (WinFont *) tkFontPtr;
- DeleteObject(fontPtr->hFont);
- ckfree((char *) fontPtr);
+ ReleaseFont(fontPtr);
}
\f
/*
*---------------------------------------------------------------------------
*
- * TkpGetFontFamilies, WinFontEnumFamilyProc --
+ * TkpGetFontFamilies, WinFontFamilyEnumProc --
*
* Return information about the font families that are available
* on the display of the given window.
*
* Results:
- * interp->result is modified to hold a list of all the available
+ * Modifies interp's result object to hold a list of all the available
* font families.
*
* Side effects:
*/
void
-TkpGetFontFamilies(interp, tkwin)
- Tcl_Interp *interp; /* Interp to hold result. */
- Tk_Window tkwin; /* For display to query. */
+TkpGetFontFamilies(
+ Tcl_Interp *interp, /* Interp to hold result. */
+ Tk_Window tkwin) /* For display to query. */
{
- Window window;
- HWND hwnd;
HDC hdc;
+ HWND hwnd;
+ Window window;
- window = Tk_WindowId(tkwin);
- hwnd = (window == (Window) NULL) ? NULL : TkWinGetHWND(window);
-
- hdc = GetDC(hwnd);
- EnumFontFamilies(hdc, NULL, (FONTENUMPROC) WinFontFamilyEnumProc,
- (LPARAM) interp);
+ 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 (TkWinGetPlatformId() == VER_PLATFORM_WIN32_NT) {
+ EnumFontFamiliesW(hdc, NULL, (FONTENUMPROCW) WinFontFamilyEnumProc,
+ (LPARAM) interp);
+ } else {
+ EnumFontFamiliesA(hdc, NULL, (FONTENUMPROCA) WinFontFamilyEnumProc,
+ (LPARAM) interp);
+ }
ReleaseDC(hwnd, hdc);
}
-/* ARGSUSED */
-
static int CALLBACK
-WinFontFamilyEnumProc(elfPtr, ntmPtr, fontType, lParam)
- ENUMLOGFONT *elfPtr; /* Logical-font data. */
- NEWTEXTMETRIC *ntmPtr; /* Physical-font data (not used). */
- int fontType; /* Type of font (not used). */
- LPARAM lParam; /* Interp to hold result. */
+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;
- Tcl_AppendElement(interp, elfPtr->elfLogFont.lfFaceName);
+ 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;
}
\f
/*
+ *-------------------------------------------------------------------------
+ *
+ * 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);
+ }
+}
+\f
+/*
*---------------------------------------------------------------------------
*
* Tk_MeasureChars --
*
- * Determine the number of characters from the string that will fit
+ * 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 characters from source that
+ * 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.
*
*---------------------------------------------------------------------------
*/
+
int
-Tk_MeasureChars(tkfont, source, numChars, maxLength, flags, lengthPtr)
- Tk_Font tkfont; /* Font in which characters will be drawn. */
- CONST char *source; /* Characters to be displayed. Need not be
+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 numChars; /* Maximum number of characters to consider
+ 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
+ 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:
+ 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
+ int *lengthPtr) /* Filled with x-location just after the
* terminating character. */
{
- WinFont *fontPtr;
HDC hdc;
- HFONT hFont;
- int curX, curIdx;
+ 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);
- hFont = SelectObject(hdc, fontPtr->hFont);
+ lastSubFontPtr = &fontPtr->subFontArray[0];
+ oldFont = SelectObject(hdc, lastSubFontPtr->hFont);
- if (numChars == 0) {
+ if (numBytes == 0) {
curX = 0;
- curIdx = 0;
- } else if (maxLength <= 0) {
+ curByte = 0;
+ } else if (maxLength < 0) {
+ Tcl_UniChar ch;
SIZE size;
-
- GetTextExtentPoint32(hdc, source, numChars, &size);
- curX = size.cx;
- curIdx = numChars;
+ 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 {
- int max;
- int *partials;
+ Tcl_UniChar ch;
SIZE size;
-
- partials = (int *) ckalloc(numChars * sizeof (int));
- GetTextExtentExPoint(hdc, source, numChars, maxLength, &max,
- partials, &size);
-
- if ((flags & TK_WHOLE_WORDS) && max < numChars) {
- int sawSpace;
- int i;
-
- sawSpace = 0;
- i = max;
- while (i >= 0 && !isspace(source[i])) {
- --i;
- }
- while (i >= 0 && isspace(source[i])) {
- sawSpace = 1;
- --i;
- }
+ char buf[16];
+ FontFamily *familyPtr;
+ SubFont *thisSubFontPtr;
+ CONST char *term, *end, *p, *next;
+ int newX, termX, sawNonSpace, dstWrote;
- /*
- * If a space char was not found, and the flag for forcing
- * at least on (or more) chars to be drawn is false, then
- * set MAX to zero so no text is drawn. Otherwise, if a
- * space was found, set max to be one char past the space.
- */
-
- if ((i < 0) && !(flags & TK_AT_LEAST_ONE)) {
- max = 0;
- } else if (sawSpace) {
- max = i + 1;
+ /*
+ * 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), NULL, &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;
}
-
- }
- if (max == 0) {
- curX = 0;
- } else {
- curX = partials[max - 1];
+ next += Tcl_UtfToUniChar(next, &ch);
+ if ((ch < 256) && isspace(ch)) {
+ if (sawNonSpace) {
+ term = p;
+ termX = curX;
+ sawNonSpace = 0;
+ }
+ } else {
+ sawNonSpace = 1;
+ }
}
- if (((flags & TK_PARTIAL_OK) && max < numChars && curX < maxLength)
- || ((flags & TK_AT_LEAST_ONE) && max == 0 && numChars > 0)) {
- /* CYGNUS LOCAL - BUG ALERT - We have to pass the bogus length, and
- the dummyMax parameter, because without them the call crashes on
- NT/J Service Pack 3 and less. This is documented in the
- Microsoft Knowledge Base. */
-
- int dummyMax;
+ /*
+ * 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)) {
/*
- * We want to include the first character that didn't
- * quite fit. Call the function again to include the
- * width of the extra character.
- */
-
- GetTextExtentExPoint(hdc, source, max + 1, INT_MAX, &dummyMax,
- partials, &size);
- curX = partials[max];
- ++max;
-
- }
-
- ckfree((char *) partials);
- curIdx = max;
+ * 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, hFont);
+ SelectObject(hdc, oldFont);
ReleaseDC(fontPtr->hwnd, hdc);
*lengthPtr = curX;
- return curIdx;
+ return curByte;
}
\f
/*
*/
void
-Tk_DrawChars(display, drawable, gc, tkfont, source, numChars, x, y)
- Display *display; /* Display on which to draw. */
- Drawable drawable; /* Window or pixmap in which to draw. */
- GC gc; /* Graphics context for drawing characters. */
- Tk_Font tkfont; /* Font in which characters will be drawn;
+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; /* Characters to be displayed. Need not be
+ 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 numChars; /* Number of characters in string. */
- int x, y; /* Coordinates at which to place origin of
+ int numBytes, /* Number of bytes in string. */
+ int x, int y) /* Coordinates at which to place origin of
* string when drawing. */
{
HDC dc;
- HFONT hFont;
- TkWinDCState state;
WinFont *fontPtr;
+ TkWinDCState state;
fontPtr = (WinFont *) gc->font;
display->request++;
SetBrushOrgEx(dc, gc->ts_x_origin, gc->ts_y_origin, NULL);
oldBrush = SelectObject(dc, stipple);
- SetTextAlign(dcMem, TA_LEFT | TA_TOP);
+ SetTextAlign(dcMem, TA_LEFT | TA_BASELINE);
SetTextColor(dcMem, gc->foreground);
SetBkMode(dcMem, TRANSPARENT);
SetBkColor(dcMem, RGB(0, 0, 0));
- hFont = SelectObject(dcMem, fontPtr->hFont);
-
/*
* Compute the bounding box and create a compatible bitmap.
*/
- GetTextExtentPoint(dcMem, source, numChars, &size);
+ GetTextExtentPoint(dcMem, source, numBytes, &size);
GetTextMetrics(dcMem, &tm);
size.cx -= tm.tmOverhang;
bitmap = CreateCompatibleBitmap(dc, size.cx, size.cy);
*/
PatBlt(dcMem, 0, 0, size.cx, size.cy, BLACKNESS);
- TextOut(dcMem, 0, 0, source, numChars);
+ 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);
- TextOut(dcMem, 0, 0, source, numChars);
+ 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, hFont);
SelectObject(dcMem, oldBitmap);
DeleteObject(bitmap);
DeleteDC(dcMem);
SetTextAlign(dc, TA_LEFT | TA_BASELINE);
SetTextColor(dc, gc->foreground);
SetBkMode(dc, TRANSPARENT);
- hFont = SelectObject(dc, fontPtr->hFont);
- TextOut(dc, x, y, source, numChars);
- SelectObject(dc, hFont);
+ MultiFontTextOut(dc, fontPtr, source, numBytes, x, y);
}
TkWinReleaseDrawableDC(drawable, dc, &state);
}
\f
/*
- *---------------------------------------------------------------------------
+ *-------------------------------------------------------------------------
*
- * AllocFont --
+ * MultiFontTextOut --
*
- * Helper for TkpGetNativeFont() and TkpGetFontFromAttributes().
- * Allocates and intializes the memory for a new TkFont that
- * wraps the platform-specific data.
+ * Helper function for Tk_DrawChars. Draws characters, using the
+ * various screen fonts in fontPtr to draw multilingual characters.
+ * Note: No bidirectional support.
*
* Results:
- * Returns pointer to newly constructed TkFont.
+ * 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);
+}
+\f
+/*
+ *---------------------------------------------------------------------------
+ *
+ * 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
- * TkFont that are used exclusively by the generic TkFont code, and
+ * 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 TkFont *
-AllocFont(tkFontPtr, tkwin, hFont)
- 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. */
- HFONT hFont; /* Windows information about font. */
+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. */
{
- HWND hwnd;
- WinFont *fontPtr;
HDC hdc;
+ HWND hwnd;
+ HFONT oldFont;
TEXTMETRIC tm;
Window window;
- char buf[LF_FACESIZE];
+ 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);
- if (tkFontPtr != NULL) {
- fontPtr = (WinFont *) tkFontPtr;
- DeleteObject(fontPtr->hFont);
+ /*
+ * 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 (TkWinGetPlatformId() == VER_PLATFORM_WIN32_NT) {
+ GetTextFaceW(hdc, LF_FACESIZE, (WCHAR *) buf);
} else {
- fontPtr = (WinFont *) ckalloc(sizeof(WinFont));
+ GetTextFaceA(hdc, LF_FACESIZE, (char *) buf);
}
-
- window = Tk_WindowId(((TkWindow *) tkwin)->mainPtr->winPtr);
- hwnd = (window == None) ? NULL : TkWinGetHWND(window);
-
- hdc = GetDC(hwnd);
- hFont = SelectObject(hdc, hFont);
- GetTextFace(hdc, sizeof(buf), buf);
- GetTextMetrics(hdc, &tm);
+ Tcl_ExternalToUtfDString(systemEncoding, buf, -1, &faceString);
fontPtr->font.fid = (Font) fontPtr;
- faPtr = &fontPtr->font.fa;
- faPtr->family = Tk_GetUid(buf);
- faPtr->pointsize = MulDiv(tm.tmHeight - tm.tmInternalLeading,
- 720 * WidthMMOfScreen(Tk_Screen(tkwin)),
- 254 * WidthOfScreen(Tk_Screen(tkwin)));
+ 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 = (tm.tmStruckOut != 0) ? 1 : 0;
-
- fontPtr->font.fm.ascent = tm.tmAscent;
- fontPtr->font.fm.descent = tm.tmDescent;
- fontPtr->font.fm.maxWidth = tm.tmMaxCharWidth;
- fontPtr->font.fm.fixed = !(tm.tmPitchAndFamily & TMPF_FIXED_PITCH);
+ 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);
- hFont = SelectObject(hdc, hFont);
+ SelectObject(hdc, oldFont);
ReleaseDC(hwnd, hdc);
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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;
- fontPtr->hFont = hFont;
- fontPtr->hwnd = hwnd;
-
- return (TkFont *) fontPtr;
+ for (i = 0; i < fontPtr->numSubFonts; i++) {
+ ReleaseSubFont(&fontPtr->subFontArray[i]);
+ }
+ if (fontPtr->subFontArray != fontPtr->staticSubFonts) {
+ ckfree((char *) fontPtr->subFontArray);
+ }
}
\f
-/* CYGNUS LOCAL: This function is called when one of the non client
- metrics changes. We don't expect this to happen very often, so we
- always try to update all the known fonts. */
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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.
+ *
+ *-------------------------------------------------------------------------
+ */
-void
-TkWinNCMetricsChanged(tkwin)
- Tk_Window tkwin;
+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. */
{
- TkUpdateFonts(tkwin, FontChanged);
+ subFontPtr->hFont = hFont;
+ subFontPtr->familyPtr = AllocFontFamily(hdc, hFont, base);
+ subFontPtr->fontMap = subFontPtr->familyPtr->fontMap;
}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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.
+ *
+ *---------------------------------------------------------------------------
+ */
-/* This function returns non-zero when passed a font in a magic
- Windows non client font. */
+static void
+ReleaseSubFont(
+ SubFont *subFontPtr) /* The SubFont to delete. */
+{
+ DeleteObject(subFontPtr->hFont);
+ FreeFontFamily(subFontPtr->familyPtr);
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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 int
-FontChanged(faPtr)
- TkFontAttributes *faPtr;
+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. */
{
- return (faPtr->family != NULL
- && strncmp(faPtr->family, "windows-", 8) == 0
- && TkFindStateNum(NULL, NULL, nonClientMap,
- faPtr->family + 8) >= 0);
+ 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 (TkWinGetPlatformId() == 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;
}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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);
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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 (TkWinGetPlatformId() == 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;
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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;
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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);
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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);
+ }
+ }
+}
+\f
+/*
+ *---------------------------------------------------------------------------
+ *
+ * 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;
+}
+\f
+/*
+ *---------------------------------------------------------------------------
+ *
+ * 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;
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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];
+}
+\f
+/*
+ *---------------------------------------------------------------------------
+ *
+ * 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 (TkWinGetPlatformId() == VER_PLATFORM_WIN32_NT) {
+ Tcl_UniChar *src, *dst;
+
+ /*
+ * We can only store up to LF_FACESIZE wide characters
+ */
+ if (Tcl_DStringLength(&ds) >= (LF_FACESIZE * sizeof(WCHAR))) {
+ Tcl_DStringSetLength(&ds, LF_FACESIZE);
+ }
+ src = (Tcl_UniChar *) Tcl_DStringValue(&ds);
+ dst = (Tcl_UniChar *) lf.lfFaceName;
+ while (*src != '\0') {
+ *dst++ = *src++;
+ }
+ *dst = '\0';
+ hFont = CreateFontIndirectW(&lf);
+ } else {
+ /*
+ * We can only store up to LF_FACESIZE characters
+ */
+ if (Tcl_DStringLength(&ds) >= LF_FACESIZE) {
+ Tcl_DStringSetLength(&ds, LF_FACESIZE);
+ }
+ strcpy((char *) lf.lfFaceName, Tcl_DStringValue(&ds));
+ hFont = CreateFontIndirectA((LOGFONTA *) &lf);
+ }
+ Tcl_DStringFree(&ds);
+ return hFont;
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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 (TkWinGetPlatformId() == 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;
+}
+\f
+/*
+ * 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.
+ *
+ * Symbol fonts should only use the symbol encoding
+ * for 8-bit characters [note Bug: 2406]
+ */
+
+ for (i = 0; i < segCount; i++) {
+ if (((startCount[i] & 0xff00) == 0xf000)
+ && ((endCount[i] & 0xff00) == 0xf000)) {
+ startCount[i] &= 0xff;
+ endCount[i] &= 0xff;
+ }
+ }
+ }
+ }
+ }
+ }
+ SelectObject(hdc, hFont);
+
+ *startCountPtr = startCount;
+ *endCountPtr = endCount;
+ return segCount;
+}
+\f
+/*
+ *-------------------------------------------------------------------------
+ *
+ * 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;
+}
+
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