diff options
Diffstat (limited to 'unix/tkUnixFont.c')
| -rw-r--r-- | unix/tkUnixFont.c | 475 |
1 files changed, 391 insertions, 84 deletions
diff --git a/unix/tkUnixFont.c b/unix/tkUnixFont.c index d97723b..62f594b 100644 --- a/unix/tkUnixFont.c +++ b/unix/tkUnixFont.c @@ -9,7 +9,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tkUnixFont.c,v 1.33 2007/02/28 09:23:30 dkf Exp $ + * RCS: @(#) $Id: tkUnixFont.c,v 1.43 2010/12/02 11:38:29 dkf Exp $ */ #include "tkUnixInt.h" @@ -21,7 +21,7 @@ * The preferred font encodings. */ -static CONST char *encodingList[] = { +static const char *const encodingList[] = { "iso8859-1", "jis0208", "jis0212", NULL }; @@ -139,9 +139,9 @@ typedef struct UnixFont { */ typedef struct EncodingAlias { - char *realName; /* The real name of the encoding to load if + const char *realName; /* The real name of the encoding to load if * the provided name matched the pattern. */ - char *aliasPattern; /* Pattern for encoding name, of the form that + const char *aliasPattern; /* Pattern for encoding name, of the form that * is acceptable to Tcl_StringMatch. */ } EncodingAlias; @@ -207,31 +207,31 @@ static void FontPkgCleanup(ClientData clientData); static FontFamily * AllocFontFamily(Display *display, XFontStruct *fontStructPtr, int base); static SubFont * CanUseFallback(UnixFont *fontPtr, - CONST char *fallbackName, int ch, + const char *fallbackName, int ch, SubFont **fixSubFontPtrPtr); static SubFont * CanUseFallbackWithAliases(UnixFont *fontPtr, - char *fallbackName, int ch, + const char *fallbackName, int ch, Tcl_DString *nameTriedPtr, SubFont **fixSubFontPtrPtr); -static int ControlUtfProc(ClientData clientData, CONST char *src, +static int ControlUtfProc(ClientData clientData, const char *src, int srcLen, int flags, Tcl_EncodingState*statePtr, char *dst, int dstLen, int *srcReadPtr, int *dstWrotePtr, int *dstCharsPtr); static XFontStruct * CreateClosestFont(Tk_Window tkwin, - CONST TkFontAttributes *faPtr, - CONST TkXLFDAttributes *xaPtr); + const TkFontAttributes *faPtr, + const TkXLFDAttributes *xaPtr); static SubFont * FindSubFontForChar(UnixFont *fontPtr, int ch, SubFont **fixSubFontPtrPtr); static void FontMapInsert(SubFont *subFontPtr, int ch); static void FontMapLoadPage(SubFont *subFontPtr, int row); static int FontMapLookup(SubFont *subFontPtr, int ch); static void FreeFontFamily(FontFamily *afPtr); -static CONST char * GetEncodingAlias(CONST char *name); +static const char * GetEncodingAlias(const char *name); static int GetFontAttributes(Display *display, XFontStruct *fontStructPtr, FontAttributes *faPtr); static XFontStruct * GetScreenFont(Display *display, FontAttributes *wantPtr, char **nameList, - int bestIdx[], unsigned int bestScore[]); + int bestIdx[], unsigned bestScore[]); static XFontStruct * GetSystemFont(Display *display); static int IdentifySymbolEncodings(FontAttributes *faPtr); static void InitFont(Tk_Window tkwin, XFontStruct *fontStructPtr, @@ -239,21 +239,21 @@ static void InitFont(Tk_Window tkwin, XFontStruct *fontStructPtr, static void InitSubFont(Display *display, XFontStruct *fontStructPtr, int base, SubFont *subFontPtr); -static char ** ListFonts(Display *display, CONST char *faceName, +static char ** ListFonts(Display *display, const char *faceName, int *numNamesPtr); -static char ** ListFontOrAlias(Display *display, CONST char*faceName, +static char ** ListFontOrAlias(Display *display, const char*faceName, int *numNamesPtr); -static unsigned int RankAttributes(FontAttributes *wantPtr, +static unsigned RankAttributes(FontAttributes *wantPtr, FontAttributes *gotPtr); static void ReleaseFont(UnixFont *fontPtr); static void ReleaseSubFont(Display *display, SubFont *subFontPtr); -static int SeenName(CONST char *name, Tcl_DString *dsPtr); +static int SeenName(const char *name, Tcl_DString *dsPtr); #ifndef WORDS_BIGENDIAN -static int Ucs2beToUtfProc(ClientData clientData, CONST char*src, +static int Ucs2beToUtfProc(ClientData clientData, const char*src, int srcLen, int flags, Tcl_EncodingState*statePtr, char *dst, int dstLen, int *srcReadPtr, int *dstWrotePtr, int *dstCharsPtr); -static int UtfToUcs2beProc(ClientData clientData, CONST char*src, +static int UtfToUcs2beProc(ClientData clientData, const char*src, int srcLen, int flags, Tcl_EncodingState*statePtr, char *dst, int dstLen, int *srcReadPtr, int *dstWrotePtr, int *dstCharsPtr); @@ -281,7 +281,7 @@ static void FontPkgCleanup( ClientData clientData) { - ThreadSpecificData *tsdPtr = (ThreadSpecificData *) + ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); if (tsdPtr->controlFamily.encoding != NULL) { @@ -320,7 +320,7 @@ void TkpFontPkgInit( TkMainInfo *mainPtr) /* The application being created. */ { - ThreadSpecificData *tsdPtr = (ThreadSpecificData *) + ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); Tcl_EncodingType type; SubFont dummy; @@ -382,7 +382,7 @@ TkpFontPkgInit( static int ControlUtfProc( ClientData clientData, /* Not used. */ - CONST char *src, /* Source string in UTF-8. */ + const char *src, /* Source string in UTF-8. */ int srcLen, /* Source string length in bytes. */ int flags, /* Conversion control flags. */ Tcl_EncodingState *statePtr,/* Place for conversion routine to store state @@ -406,7 +406,7 @@ ControlUtfProc( * correspond to the bytes stored in the * output buffer. */ { - CONST char *srcStart, *srcEnd; + const char *srcStart, *srcEnd; char *dstStart, *dstEnd; Tcl_UniChar ch; int result; @@ -475,7 +475,7 @@ ControlUtfProc( static int Ucs2beToUtfProc( ClientData clientData, /* Not used. */ - CONST char *src, /* Source string in Unicode. */ + const char *src, /* Source string in Unicode. */ int srcLen, /* Source string length in bytes. */ int flags, /* Conversion control flags. */ Tcl_EncodingState *statePtr,/* Place for conversion routine to store state @@ -499,7 +499,7 @@ Ucs2beToUtfProc( * correspond to the bytes stored in the * output buffer. */ { - CONST char *srcStart, *srcEnd; + const char *srcStart, *srcEnd; char *dstEnd, *dstStart; int result, numChars; @@ -558,7 +558,7 @@ static int UtfToUcs2beProc( ClientData clientData, /* TableEncodingData that specifies * encoding. */ - CONST char *src, /* Source string in UTF-8. */ + const char *src, /* Source string in UTF-8. */ int srcLen, /* Source string length in bytes. */ int flags, /* Conversion control flags. */ Tcl_EncodingState *statePtr,/* Place for conversion routine to store state @@ -582,7 +582,7 @@ UtfToUcs2beProc( * correspond to the bytes stored in the * output buffer. */ { - CONST char *srcStart, *srcEnd, *srcClose, *dstStart, *dstEnd; + const char *srcStart, *srcEnd, *srcClose, *dstStart, *dstEnd; int result, numChars; Tcl_UniChar ch; @@ -658,12 +658,12 @@ UtfToUcs2beProc( TkFont * TkpGetNativeFont( Tk_Window tkwin, /* For display where font will be used. */ - CONST char *name) /* Platform-specific font name. */ + const char *name) /* Platform-specific font name. */ { UnixFont *fontPtr; XFontStruct *fontStructPtr; FontAttributes fa; - CONST char *p; + const char *p; int hasSpace, dashes, hasWild; /* @@ -765,7 +765,7 @@ TkpGetFontFromAttributes( * will be released. If NULL, a new TkFont * structure is allocated. */ Tk_Window tkwin, /* For display where font will be used. */ - CONST TkFontAttributes *faPtr) + const TkFontAttributes *faPtr) /* Set of attributes to match. */ { UnixFont *fontPtr; @@ -847,8 +847,6 @@ TkpGetFontFamilies( Tcl_HashSearch search; Tcl_Obj *resultPtr, *strPtr; - resultPtr = Tcl_GetObjResult(interp); - Tcl_InitHashTable(&familyTable, TCL_STRING_KEYS); nameList = ListFonts(Tk_Display(tkwin), "*", &numNames); for (i = 0; i < numNames; i++) { @@ -876,11 +874,13 @@ TkpGetFontFamilies( XFreeFontNames(nameList); hPtr = Tcl_FirstHashEntry(&familyTable, &search); + resultPtr = Tcl_NewObj(); while (hPtr != NULL) { strPtr = Tcl_NewStringObj(Tcl_GetHashKey(&familyTable, hPtr), -1); Tcl_ListObjAppendElement(NULL, resultPtr, strPtr); hPtr = Tcl_NextHashEntry(&search); } + Tcl_SetObjResult(interp, resultPtr); Tcl_DeleteHashTable(&familyTable); } @@ -913,7 +913,7 @@ TkpGetSubFonts( UnixFont *fontPtr; FontFamily *familyPtr; - resultPtr = Tcl_GetObjResult(interp); + resultPtr = Tcl_NewObj(); fontPtr = (UnixFont *) tkfont; for (i = 0; i < fontPtr->numSubFonts; i++) { familyPtr = fontPtr->subFontArray[i].familyPtr; @@ -924,6 +924,7 @@ TkpGetSubFonts( listPtr = Tcl_NewListObj(3, objv); Tcl_ListObjAppendElement(NULL, resultPtr, listPtr); } + Tcl_SetObjResult(interp, resultPtr); } /* @@ -960,6 +961,7 @@ TkpGetFontAttrsForChar( SubFont *thisSubFontPtr = FindSubFontForChar(fontPtr, c, &lastSubFontPtr); /* Pointer to the subfont to use for the given * character */ + GetFontAttributes(Tk_Display(tkwin), thisSubFontPtr->fontStructPtr, &atts); *faPtr = atts.fa; } @@ -988,7 +990,7 @@ TkpGetFontAttrsForChar( 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 + 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. */ @@ -1027,7 +1029,7 @@ Tk_MeasureChars( curX = 0; curByte = 0; } else if (maxLength < 0) { - CONST char *p, *end, *next; + const char *p, *end, *next; Tcl_UniChar ch; SubFont *thisSubFontPtr; FontFamily *familyPtr; @@ -1080,11 +1082,11 @@ Tk_MeasureChars( Tcl_DStringFree(&runString); curByte = numBytes; } else { - CONST char *p, *end, *next, *term; + const char *p, *end, *next, *term; int newX, termX, sawNonSpace, dstWrote; Tcl_UniChar ch; FontFamily *familyPtr; - char buf[16]; + XChar2b buf[8]; /* * How many chars will fit in the space allotted? This first version @@ -1106,14 +1108,14 @@ Tk_MeasureChars( } else { lastSubFontPtr = FindSubFontForChar(fontPtr, ch, NULL); familyPtr = lastSubFontPtr->familyPtr; - Tcl_UtfToExternal(NULL, familyPtr->encoding, p, next - p, - 0, NULL, buf, sizeof(buf), NULL, &dstWrote, NULL); + Tcl_UtfToExternal(NULL, familyPtr->encoding, p, next - p, 0, NULL, + (char *)&buf[0].byte1, sizeof(buf), NULL, &dstWrote, NULL); if (familyPtr->isTwoByteFont) { newX += XTextWidth16(lastSubFontPtr->fontStructPtr, - (XChar2b *) buf, dstWrote >> 1); + buf, dstWrote >> 1); } else { - newX += XTextWidth(lastSubFontPtr->fontStructPtr, buf, - dstWrote); + newX += XTextWidth(lastSubFontPtr->fontStructPtr, + (char *)&buf[0].byte1, dstWrote); } } if (newX > maxLength) { @@ -1202,7 +1204,7 @@ Tk_MeasureChars( int TkpMeasureCharsInContext( Tk_Font tkfont, /* Font in which characters will be drawn. */ - CONST char *source, /* UTF-8 string to be displayed. Need not be + const char *source, /* UTF-8 string to be displayed. Need not be * '\0' terminated. */ int numBytes, /* Maximum number of bytes to consider from * source string in all. */ @@ -1255,7 +1257,7 @@ Tk_DrawChars( 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 + 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 @@ -1266,22 +1268,20 @@ Tk_DrawChars( int x, int y) /* Coordinates at which to place origin of * string when drawing. */ { - UnixFont *fontPtr; + UnixFont *fontPtr = (UnixFont *) tkfont; SubFont *thisSubFontPtr, *lastSubFontPtr; Tcl_DString runString; - CONST char *p, *end, *next; + const char *p, *end, *next; int xStart, needWidth, window_width, do_width; Tcl_UniChar ch; FontFamily *familyPtr; #ifdef TK_DRAW_CHAR_XWINDOW_CHECK int rx, ry; - unsigned int width, height, border_width, depth; + unsigned width, height, border_width, depth; Drawable root; #endif - fontPtr = (UnixFont *) tkfont; lastSubFontPtr = &fontPtr->subFontArray[0]; - xStart = x; #ifdef TK_DRAW_CHAR_XWINDOW_CHECK @@ -1394,7 +1394,7 @@ TkpDrawCharsInContext( 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 + 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 @@ -1443,9 +1443,9 @@ TkpDrawCharsInContext( static XFontStruct * CreateClosestFont( Tk_Window tkwin, /* For display where font will be used. */ - CONST TkFontAttributes *faPtr, + const TkFontAttributes *faPtr, /* Set of generic attributes to match. */ - CONST TkXLFDAttributes *xaPtr) + const TkXLFDAttributes *xaPtr) /* Set of X-specific attributes to match. */ { FontAttributes want; @@ -1453,7 +1453,7 @@ CreateClosestFont( int numNames, nameIdx, bestIdx[2]; Display *display; XFontStruct *fontStructPtr; - unsigned int bestScore[2]; + unsigned bestScore[2]; want.fa = *faPtr; want.xa = *xaPtr; @@ -1483,9 +1483,9 @@ CreateClosestFont( nameList = ListFontOrAlias(display, want.fa.family, &numNames); if (numNames == 0) { - char ***fontFallbacks; + const char *const *const *fontFallbacks; int i, j; - char *fallback; + const char *fallback; fontFallbacks = TkFontGetFallbacks(); for (i = 0; fontFallbacks[i] != NULL; i++) { @@ -1515,12 +1515,12 @@ CreateClosestFont( found: bestIdx[0] = -1; bestIdx[1] = -1; - bestScore[0] = (unsigned int) -1; - bestScore[1] = (unsigned int) -1; + bestScore[0] = (unsigned) -1; + bestScore[1] = (unsigned) -1; for (nameIdx = 0; nameIdx < numNames; nameIdx++) { FontAttributes got; int scalable; - unsigned int score; + unsigned score; if (TkFontParseXLFD(nameList[nameIdx], &got.fa, &got.xa) != TCL_OK) { continue; @@ -1576,7 +1576,7 @@ InitFont( UnixFont *fontPtr) /* Filled with information constructed from * the above arguments. */ { - ThreadSpecificData *tsdPtr = (ThreadSpecificData *) + ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); unsigned long value; int minHi, maxHi, minLo, maxLo, fixed, width, limit, i, n; @@ -1829,7 +1829,7 @@ AllocFontFamily( FontFamily *familyPtr; FontAttributes fa; Tcl_Encoding encoding; - ThreadSpecificData *tsdPtr = (ThreadSpecificData *) + ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); GetFontAttributes(display, fontStructPtr, &fa); @@ -1903,7 +1903,7 @@ FreeFontFamily( FontFamily *familyPtr) /* The FontFamily to delete. */ { FontFamily **familyPtrPtr; - ThreadSpecificData *tsdPtr = (ThreadSpecificData *) + ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); int i; @@ -1969,7 +1969,11 @@ FindSubFontForChar( { int i, j, k, numNames; Tk_Uid faceName; - char *fallback, **aliases, **nameList, **anyFallbacks, ***fontFallbacks; + const char *fallback; + const char *const *aliases; + char **nameList; + const char *const *anyFallbacks; + const char *const *const *fontFallbacks; SubFont *subFontPtr; Tcl_DString ds; @@ -2206,7 +2210,7 @@ FontMapLoadPage( Tcl_Encoding encoding; XFontStruct *fontStructPtr; XCharStruct *widths; - ThreadSpecificData *tsdPtr = (ThreadSpecificData *) + ThreadSpecificData *tsdPtr = Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData)); subFontPtr->fontMap[row] = (char *) ckalloc(FONTMAP_BITSPERPAGE / 8); @@ -2287,7 +2291,7 @@ static SubFont * CanUseFallbackWithAliases( UnixFont *fontPtr, /* The font object that will own the new * screen font. */ - char *faceName, /* Desired face name for new screen font. */ + const char *faceName, /* Desired face name for new screen font. */ int ch, /* The Unicode character that the new screen * font must be able to display. */ Tcl_DString *nameTriedPtr, /* Records face names that have already been @@ -2298,7 +2302,7 @@ CanUseFallbackWithAliases( * reallocate our subfont table. */ { SubFont *subFontPtr; - char **aliases; + const char *const *aliases; int i; if (SeenName(faceName, nameTriedPtr) == 0) { @@ -2343,11 +2347,11 @@ CanUseFallbackWithAliases( static int SeenName( - CONST char *name, /* The name to check. */ + const char *name, /* The name to check. */ Tcl_DString *dsPtr) /* Contains names that have already been * seen. */ { - CONST char *seen, *end; + const char *seen, *end; seen = Tcl_DStringValue(dsPtr); end = seen + Tcl_DStringLength(dsPtr); @@ -2357,7 +2361,7 @@ SeenName( } seen += strlen(seen) + 1; } - Tcl_DStringAppend(dsPtr, (char *) name, (int) (strlen(name) + 1)); + Tcl_DStringAppend(dsPtr, name, (int) (strlen(name) + 1)); return 0; } @@ -2392,7 +2396,7 @@ static SubFont * CanUseFallback( UnixFont *fontPtr, /* The font object that will own the new * screen font. */ - CONST char *faceName, /* Desired face name for new screen font. */ + const char *faceName, /* Desired face name for new screen font. */ int ch, /* The Unicode character that the new screen * font must be able to display. */ SubFont **fixSubFontPtrPtr) /* Subfont reference to fix up if we @@ -2400,9 +2404,11 @@ CanUseFallback( { int i, nameIdx, numNames, srcLen, numEncodings, bestIdx[2]; Tk_Uid hateFoundry; - CONST char *charset, *hateCharset; - unsigned int bestScore[2]; - char **nameList, **nameListOrig, src[TCL_UTF_MAX]; + const char *charset, *hateCharset; + unsigned bestScore[2]; + char **nameList; + char **nameListOrig; + char src[TCL_UTF_MAX]; FontAttributes want, got; Display *display; SubFont subFont; @@ -2450,13 +2456,13 @@ CanUseFallback( retry: bestIdx[0] = -1; bestIdx[1] = -1; - bestScore[0] = (unsigned int) -1; - bestScore[1] = (unsigned int) -1; + bestScore[0] = (unsigned) -1; + bestScore[1] = (unsigned) -1; for (nameIdx = 0; nameIdx < numNames; nameIdx++) { Tcl_Encoding encoding; char dst[16]; int scalable, srcRead, dstWrote; - unsigned int score; + unsigned score; if (nameList[nameIdx] == NULL) { continue; @@ -2624,12 +2630,12 @@ CanUseFallback( *--------------------------------------------------------------------------- */ -static unsigned int +static unsigned RankAttributes( FontAttributes *wantPtr, /* The desired attributes. */ FontAttributes *gotPtr) /* The attributes we have to live with. */ { - unsigned int penalty; + unsigned penalty; penalty = 0; if (gotPtr->xa.foundry != wantPtr->xa.foundry) { @@ -2676,7 +2682,7 @@ RankAttributes( } if (gotPtr->xa.charset != wantPtr->xa.charset) { int i; - CONST char *gotAlias, *wantAlias; + const char *gotAlias, *wantAlias; penalty += 65000; gotAlias = GetEncodingAlias(gotPtr->xa.charset); @@ -2721,7 +2727,7 @@ GetScreenFont( char **nameList, /* Array of XLFDs. */ int bestIdx[2], /* Indices into above array for XLFD of best * bitmapped and best scalable font. */ - unsigned int bestScore[2]) /* Scores of best bitmapped and best scalable + unsigned bestScore[2]) /* Scores of best bitmapped and best scalable * font. XLFD corresponding to lowest score * will be constructed. */ { @@ -2890,7 +2896,7 @@ GetFontAttributes( static char ** ListFonts( Display *display, /* Display to query. */ - CONST char *faceName, /* Desired face name, or "*" for all. */ + const char *faceName, /* Desired face name, or "*" for all. */ int *numNamesPtr) /* Filled with length of returned array, or 0 * if no names were found. */ { @@ -2903,11 +2909,12 @@ ListFonts( static char ** ListFontOrAlias( Display *display, /* Display to query. */ - CONST char *faceName, /* Desired face name, or "*" for all. */ + const char *faceName, /* Desired face name, or "*" for all. */ int *numNamesPtr) /* Filled with length of returned array, or 0 * if no names were found. */ { - char **nameList, **aliases; + char **nameList; + const char *const *aliases; int i; nameList = ListFonts(display, faceName, numNamesPtr); @@ -2956,7 +2963,8 @@ IdentifySymbolEncodings( FontAttributes *faPtr) { int i, j; - char **aliases, **symbolClass; + const char *const *aliases; + const char *const *symbolClass; symbolClass = TkFontGetSymbolClass(); for (i = 0; symbolClass[i] != NULL; i++) { @@ -2995,14 +3003,14 @@ IdentifySymbolEncodings( *--------------------------------------------------------------------------- */ -static CONST char * +static const char * GetEncodingAlias( - CONST char *name) /* The name to look up. */ + const char *name) /* The name to look up. */ { EncodingAlias *aliasPtr; for (aliasPtr = encodingAliases; aliasPtr->aliasPattern != NULL; ) { - if (Tcl_StringMatch((char *) name, aliasPtr->aliasPattern)) { + if (Tcl_StringMatch(name, aliasPtr->aliasPattern)) { return aliasPtr->realName; } aliasPtr++; @@ -3011,6 +3019,305 @@ GetEncodingAlias( } /* + *--------------------------------------------------------------------------- + * + * TkDrawAngledChars -- + * + * Draw some characters at an angle. This is awkward here because we have + * no reliable way of drawing any characters at an angle in classic X11; + * we have to draw on a Pixmap which is converted to an XImage (from + * helper function GetImageOfText), rotate the image (hokey code!) onto + * another XImage (from helper function InitDestImage), and then use the + * rotated image as a mask when drawing. This is pretty awful; improved + * versions are welcomed! + * + * Results: + * None. + * + * Side effects: + * Target drawable is updated. + * + *--------------------------------------------------------------------------- + */ + +static inline XImage * +GetImageOfText( + Display *display, /* Display on which to draw. */ + Drawable drawable, /* Window or pixmap in which to draw. */ + Tk_Font tkfont, /* Font in which characters will be drawn. */ + 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 *realWidthPtr, int *realHeightPtr) +{ + int width, height; + TkFont *fontPtr = (TkFont *) tkfont; + Pixmap bitmap; + GC bitmapGC; + XGCValues values; + XImage *image; + + (void) Tk_MeasureChars(tkfont, source, numBytes, -1, 0, &width); + height = fontPtr->fm.ascent + fontPtr->fm.descent; + + bitmap = Tk_GetPixmap(display, drawable, width, height, 1); + values.graphics_exposures = False; + values.foreground = BlackPixel(display, DefaultScreen(display)); + bitmapGC = XCreateGC(display, bitmap, GCGraphicsExposures|GCForeground, + &values); + XFillRectangle(display, bitmap, bitmapGC, 0, 0, width, height); + + values.font = Tk_FontId(tkfont); + values.foreground = WhitePixel(display, DefaultScreen(display)); + values.background = BlackPixel(display, DefaultScreen(display)); + XChangeGC(display, bitmapGC, GCFont|GCForeground|GCBackground, &values); + Tk_DrawChars(display, bitmap, bitmapGC, tkfont, source, numBytes, 0, + fontPtr->fm.ascent); + XFreeGC(display, bitmapGC); + + image = XGetImage(display, bitmap, 0, 0, width, height, AllPlanes, + ZPixmap); + Tk_FreePixmap(display, bitmap); + + *realWidthPtr = width; + *realHeightPtr = height; + return image; +} + +static inline XImage * +InitDestImage( + Display *display, + Drawable drawable, + int width, + int height, + Pixmap *bitmapPtr) +{ + Pixmap bitmap; + XImage *image; + GC bitmapGC; + XGCValues values; + + bitmap = Tk_GetPixmap(display, drawable, width, height, 1); + values.graphics_exposures = False; + values.foreground = BlackPixel(display, DefaultScreen(display)); + bitmapGC = XCreateGC(display, bitmap, GCGraphicsExposures|GCForeground, + &values); + XFillRectangle(display, bitmap, bitmapGC, 0, 0, width, height); + XFreeGC(display, bitmapGC); + + image = XGetImage(display, bitmap, 0, 0, width, height, AllPlanes, + ZPixmap); + *bitmapPtr = bitmap; + return image; +} + +void +TkDrawAngledChars( + Display *display, /* Display on which to draw. */ + Drawable drawable, /* Window or pixmap in which to draw. */ + GC gc, /* Graphics context for drawing characters. */ + Tk_Font tkfont, /* Font in which characters will be drawn; + * must be the same as font used in GC. */ + const char *source, /* UTF-8 string to be displayed. Need not be + * '\0' terminated. All Tk meta-characters + * (tabs, control characters, and newlines) + * should be stripped out of the string that + * is passed to this function. If they are not + * stripped out, they will be displayed as + * regular printing characters. */ + int numBytes, /* Number of bytes in string. */ + double x, double y, + double angle) +{ + if (angle == 0.0) { + Tk_DrawChars(display, drawable, gc, tkfont, source, numBytes, x, y); + } else { + double sinA = sin(angle * PI/180.0), cosA = cos(angle * PI/180.0); + int bufHeight, bufWidth, srcWidth, srcHeight, i, j, dx, dy; + Pixmap buf; + XImage *srcImage = GetImageOfText(display, drawable, tkfont, source, + numBytes, &srcWidth, &srcHeight); + XImage *dstImage; + enum {Q0=1,R1,Q1,R2,Q2,R3,Q3} quadrant; + GC bwgc, cpgc; + XGCValues values; + int ascent = ((TkFont *) tkfont)->fm.ascent; + + /* + * First, work out what quadrant we are operating in. We also handle + * the rectilinear rotations as special cases. Conceptually, there's + * also R0 (angle == 0.0) but that has been already handled as a + * special case above. + * + * R1 + * Q1 | Q0 + * | + * R2 ----+---- R0 + * | + * Q2 | Q3 + * R3 + */ + + if (angle < 90.0) { + quadrant = Q0; + } else if (angle == 90.0) { + quadrant = R1; + } else if (angle < 180.0) { + quadrant = Q1; + } else if (angle == 180.0) { + quadrant = R2; + } else if (angle < 270.0) { + quadrant = Q2; + } else if (angle == 270.0) { + quadrant = R3; + } else { + quadrant = Q3; + } + + if (srcImage == NULL) { + return; + } + bufWidth = srcWidth*fabs(cosA) + srcHeight*fabs(sinA); + bufHeight = srcHeight*fabs(cosA) + srcWidth*fabs(sinA); + dstImage = InitDestImage(display, drawable, bufWidth,bufHeight, &buf); + if (dstImage == NULL) { + Tk_FreePixmap(display, buf); + XDestroyImage(srcImage); + return; + } + + /* + * Do the rotation, setting or resetting pixels in the destination + * image dependent on whether the corresponding pixel (after rotation + * to source image space) is set. + */ + + for (i=0 ; i<srcWidth ; i++) { + for (j=0 ; j<srcHeight ; j++) { + switch (quadrant) { + case Q0: + dx = ROUND16(i*cosA + j*sinA); + dy = ROUND16(j*cosA + (srcWidth - i)*sinA); + break; + case R1: + dx = j; + dy = srcWidth - i; + break; + case Q1: + dx = ROUND16((i - srcWidth)*cosA + j*sinA); + dy = ROUND16((srcWidth-i)*sinA + (j-srcHeight)*cosA); + break; + case R2: + dx = srcWidth - i; + dy = srcHeight - j; + break; + case Q2: + dx = ROUND16((i-srcWidth)*cosA + (j-srcHeight)*sinA); + dy = ROUND16((j - srcHeight)*cosA - i*sinA); + break; + case R3: + dx = srcHeight - j; + dy = i; + break; + default: + dx = ROUND16(i*cosA + (j - srcHeight)*sinA); + dy = ROUND16(j*cosA - i*sinA); + } + + if (dx < 0 || dy < 0 || dx >= bufWidth || dy >= bufHeight) { + continue; + } + XPutPixel(dstImage, dx, dy, + XGetPixel(dstImage,dx,dy) | XGetPixel(srcImage,i,j)); + } + } + XDestroyImage(srcImage); + + /* + * Schlep the data back to the Xserver. + */ + + values.function = GXcopy; + values.foreground = WhitePixel(display, DefaultScreen(display)); + values.background = BlackPixel(display, DefaultScreen(display)); + bwgc = XCreateGC(display, buf, GCFunction|GCForeground|GCBackground, + &values); + XPutImage(display, buf, bwgc, dstImage, 0,0, 0,0, bufWidth,bufHeight); + XFreeGC(display, bwgc); + XDestroyImage(dstImage); + + /* + * Calculate where we want to draw the text. + */ + + switch (quadrant) { + case Q0: + dx = x; + dy = y - srcWidth*sinA; + break; + case R1: + dx = x; + dy = y - srcWidth; + break; + case Q1: + dx = x + srcWidth*cosA; + dy = y + srcHeight*cosA - srcWidth*sinA; + break; + case R2: + dx = x - srcWidth; + dy = y - srcHeight; + break; + case Q2: + dx = x + srcWidth*cosA + srcHeight*sinA; + dy = y + srcHeight*cosA; + break; + case R3: + dx = x - srcHeight; + dy = y; + break; + default: + dx = x + srcHeight*sinA; + dy = y; + } + + /* + * Apply a correction to deal with the fact that we aren't told to + * draw from our top-left corner but rather from the left-end of our + * baseline. + */ + + dx -= ascent*sinA; + dy -= ascent*cosA; + + /* + * Transfer the text to the screen. This is done by using it as a mask + * and then drawing through that mask with the original drawing color. + */ + + values.function = GXcopy; + values.fill_style = FillSolid; + values.clip_mask = buf; + values.clip_x_origin = dx; + values.clip_y_origin = dy; + cpgc = XCreateGC(display, drawable, + GCFunction|GCFillStyle|GCClipMask|GCClipXOrigin|GCClipYOrigin, + &values); + XCopyGC(display, gc, GCForeground, cpgc); + XFillRectangle(display, drawable, cpgc, dx, dy, bufWidth, + bufHeight); + XFreeGC(display, cpgc); + + Tk_FreePixmap(display, buf); + return; + } +} + +/* * Local Variables: * mode: c * c-basic-offset: 4 |