stk/Tk/win/tkWinFont.c

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1999-02-02 06:13:40 -05:00
/*
* tkWinFont.c --
*
* 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.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkWinFont.c 1.20 97/05/14 15:45:30
*/
#include "tkWinInt.h"
#include "tkFont.h"
/*
* The following structure represents Windows' implementation of a font.
*/
typedef struct WinFont {
TkFont font; /* Stuff used by generic font package. Must
* be first in structure. */
HFONT hFont; /* Windows information about font. */
HWND hwnd; /* Toplevel window of application that owns
* this font, used for getting HDC. */
} WinFont;
/*
* The following structure is used as to map between the Tcl strings
* that represent the system fonts and the numbers used by Windows.
*/
static TkStateMap systemMap[] = {
{ANSI_FIXED_FONT, "ansifixed"},
{ANSI_VAR_FONT, "ansi"},
{DEVICE_DEFAULT_FONT, "device"},
{OEM_FIXED_FONT, "oemfixed"},
{SYSTEM_FIXED_FONT, "systemfixed"},
{SYSTEM_FONT, "system"},
{-1, NULL}
};
#define ABS(x) (((x) < 0) ? -(x) : (x))
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));
/*
*---------------------------------------------------------------------------
*
* TkpGetNativeFont --
*
* Map a platform-specific native font name to a TkFont.
*
* Results:
* The return value is a pointer to a TkFont that represents the
* native font. If a native font by the given name could not be
* found, the return value is NULL.
*
* Every call to this procedure returns a new TkFont structure,
* even if the name has already been seen before. The caller should
* call TkpDeleteFont() when the font is no longer needed.
*
* The caller is responsible for initializing the memory associated
* with the generic TkFont when this function returns and releasing
* the contents of the generic TkFont before calling TkpDeleteFont().
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
TkFont *
TkpGetNativeFont(tkwin, name)
Tk_Window tkwin; /* For display where font will be used. */
CONST char *name; /* Platform-specific font name. */
{
int object;
HFONT hFont;
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);
}
/*
*---------------------------------------------------------------------------
*
* TkpGetFontFromAttributes --
*
* Given a desired set of attributes for a font, find a font with
* the closest matching attributes.
*
* Results:
* The return value is a pointer to a TkFont that represents the
* font with the desired attributes. If a font with the desired
* attributes could not be constructed, some other font will be
* substituted automatically. NULL is never returned.
*
* Every call to this procedure returns a new TkFont structure,
* even if the specified attributes have already been seen before.
* The caller should call TkpDeleteFont() to free the platform-
* specific data when the font is no longer needed.
*
* The caller is responsible for initializing the memory associated
* with the generic TkFont when this function returns and releasing
* the contents of the generic TkFont before calling TkpDeleteFont().
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
TkFont *
TkpGetFontFromAttributes(tkFontPtr, tkwin, faPtr)
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. */
{
LOGFONT lf;
HFONT hFont;
Window window;
HWND hwnd;
HDC hdc;
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)));
}
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));
}
ReleaseDC(hwnd, hdc);
/*
* Replace the standard X and Mac family names with the names that
* Windows likes.
*/
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 = CreateFontIndirect(&lf);
if (hFont == NULL) {
hFont = GetStockObject(SYSTEM_FONT);
if (hFont == NULL) {
panic("TkpGetFontFromAttributes: cannot get system font");
}
}
return AllocFont(tkFontPtr, tkwin, hFont);
}
/*
*---------------------------------------------------------------------------
*
* TkpDeleteFont --
*
* Called to release a font allocated by TkpGetNativeFont() or
* TkpGetFontFromAttributes(). The caller should have already
* released the fields of the TkFont that are used exclusively by
* the generic TkFont code.
*
* Results:
* None.
*
* Side effects:
* TkFont is deallocated.
*
*---------------------------------------------------------------------------
*/
void
TkpDeleteFont(tkFontPtr)
TkFont *tkFontPtr; /* Token of font to be deleted. */
{
WinFont *fontPtr;
fontPtr = (WinFont *) tkFontPtr;
DeleteObject(fontPtr->hFont);
ckfree((char *) fontPtr);
}
/*
*---------------------------------------------------------------------------
*
* TkpGetFontFamilies, WinFontEnumFamilyProc --
*
* 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
* font families.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
void
TkpGetFontFamilies(interp, tkwin)
Tcl_Interp *interp; /* Interp to hold result. */
Tk_Window tkwin; /* For display to query. */
{
Window window;
HWND hwnd;
HDC hdc;
window = Tk_WindowId(tkwin);
hwnd = (window == (Window) NULL) ? NULL : TkWinGetHWND(window);
hdc = GetDC(hwnd);
#ifdef STk_CODE
Tcl_AppendResult(interp, "(", NULL);
#endif
EnumFontFamilies(hdc, NULL, (FONTENUMPROC) WinFontFamilyEnumProc,
(LPARAM) interp);
#ifdef STk_CODE
Tcl_AppendResult(interp, ")", NULL);
#endif
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. */
{
Tcl_Interp *interp;
interp = (Tcl_Interp *) lParam;
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#ifdef STk_CODE
Tcl_AppendResult(interp, " \"", elfPtr->elfLogFont.lfFaceName, "\"", NULL);
#else
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Tcl_AppendElement(interp, elfPtr->elfLogFont.lfFaceName);
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#endif
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return 1;
}
/*
*---------------------------------------------------------------------------
*
* Tk_MeasureChars --
*
* Determine the number of characters from the string that will fit
* in the given horizontal span. The measurement is done under the
* assumption that Tk_DrawChars() will be used to actually display
* the characters.
*
* Results:
* The return value is the number of characters from source that
* fit into the span that extends from 0 to maxLength. *lengthPtr is
* filled with the x-coordinate of the right edge of the last
* character that did fit.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
int
Tk_MeasureChars(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
* '\0' terminated. */
int numChars; /* Maximum number of characters to consider
* from source string. */
int maxLength; /* If > 0, maxLength specifies the longest
* permissible line length; don't consider any
* character that would cross this
* x-position. If <= 0, then line length is
* unbounded and the flags argument is
* ignored. */
int flags; /* Various flag bits OR-ed together:
* TK_PARTIAL_OK means include the last char
* which only partially fit on this line.
* TK_WHOLE_WORDS means stop on a word
* boundary, if possible.
* TK_AT_LEAST_ONE means return at least one
* character even if no characters fit. */
int *lengthPtr; /* Filled with x-location just after the
* terminating character. */
{
WinFont *fontPtr;
HDC hdc;
HFONT hFont;
int curX, curIdx;
fontPtr = (WinFont *) tkfont;
hdc = GetDC(fontPtr->hwnd);
hFont = SelectObject(hdc, fontPtr->hFont);
if (numChars == 0) {
curX = 0;
curIdx = 0;
} else if (maxLength <= 0) {
SIZE size;
GetTextExtentPoint32(hdc, source, numChars, &size);
curX = size.cx;
curIdx = numChars;
} else {
int max;
int *partials;
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;
}
/*
* 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;
}
}
if (max == 0) {
curX = 0;
} else {
curX = partials[max - 1];
}
if (((flags & TK_PARTIAL_OK) && max < numChars && curX < maxLength)
|| ((flags & TK_AT_LEAST_ONE) && max == 0 && numChars > 0)) {
/*
* 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, 0, NULL, partials,
&size);
curX = partials[max];
++max;
}
ckfree((char *) partials);
curIdx = max;
}
SelectObject(hdc, hFont);
ReleaseDC(fontPtr->hwnd, hdc);
*lengthPtr = curX;
return curIdx;
}
/*
*---------------------------------------------------------------------------
*
* Tk_DrawChars --
*
* Draw a string of characters on the screen.
*
* Results:
* None.
*
* Side effects:
* Information gets drawn on the screen.
*
*---------------------------------------------------------------------------
*/
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;
* must be the same as font used in GC. */
CONST char *source; /* Characters 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
* string when drawing. */
{
HDC dc;
HFONT hFont;
TkWinDCState state;
WinFont *fontPtr;
fontPtr = (WinFont *) gc->font;
display->request++;
if (drawable == None) {
return;
}
dc = TkWinGetDrawableDC(display, drawable, &state);
SetROP2(dc, tkpWinRopModes[gc->function]);
if ((gc->fill_style == FillStippled
|| gc->fill_style == FillOpaqueStippled)
&& gc->stipple != None) {
TkWinDrawable *twdPtr = (TkWinDrawable *)gc->stipple;
HBRUSH oldBrush, stipple;
HBITMAP oldBitmap, bitmap;
HDC dcMem;
TEXTMETRIC tm;
SIZE size;
if (twdPtr->type != TWD_BITMAP) {
panic("unexpected drawable type in stipple");
}
/*
* Select stipple pattern into destination dc.
*/
dcMem = CreateCompatibleDC(dc);
stipple = CreatePatternBrush(twdPtr->bitmap.handle);
SetBrushOrgEx(dc, gc->ts_x_origin, gc->ts_y_origin, NULL);
oldBrush = SelectObject(dc, stipple);
SetTextAlign(dcMem, TA_LEFT | TA_TOP);
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);
GetTextMetrics(dcMem, &tm);
size.cx -= tm.tmOverhang;
bitmap = CreateCompatibleBitmap(dc, size.cx, size.cy);
oldBitmap = SelectObject(dcMem, bitmap);
/*
* The following code is tricky because fonts are rendered in multiple
* colors. First we draw onto a black background and copy the white
* bits. Then we draw onto a white background and copy the black bits.
* Both the foreground and background bits of the font are ANDed with
* the stipple pattern as they are copied.
*/
PatBlt(dcMem, 0, 0, size.cx, size.cy, BLACKNESS);
TextOut(dcMem, 0, 0, source, numChars);
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);
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);
SelectObject(dc, oldBrush);
DeleteObject(stipple);
} else {
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);
}
TkWinReleaseDrawableDC(drawable, dc, &state);
}
/*
*---------------------------------------------------------------------------
*
* AllocFont --
*
* Helper for TkpGetNativeFont() and TkpGetFontFromAttributes().
* Allocates and intializes the memory for a new TkFont that
* wraps the platform-specific data.
*
* Results:
* Returns pointer to newly constructed TkFont.
*
* The caller is responsible for initializing the fields of the
* TkFont that are used exclusively by the generic TkFont code, and
* for releasing those fields before calling TkpDeleteFont().
*
* 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. */
{
HWND hwnd;
WinFont *fontPtr;
HDC hdc;
TEXTMETRIC tm;
Window window;
char buf[LF_FACESIZE];
TkFontAttributes *faPtr;
if (tkFontPtr != NULL) {
fontPtr = (WinFont *) tkFontPtr;
DeleteObject(fontPtr->hFont);
} else {
fontPtr = (WinFont *) ckalloc(sizeof(WinFont));
}
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);
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->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);
hFont = SelectObject(hdc, hFont);
ReleaseDC(hwnd, hdc);
fontPtr->hFont = hFont;
fontPtr->hwnd = hwnd;
return (TkFont *) fontPtr;
}