InfoMagic Source Code 1993 July/THE_SOURCE_CODE_CD_ROM.iso/X/mit/server/dix/glyphcurs.c

C/C++ Source or Header | 1991-06-26 | 5.0 KB | 176 lines

/************************************************************************
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

************************************************************************/

/* $XConsortium: glyphcurs.c,v 5.7 91/06/26 14:04:24 rws Exp $ */

#include "X.h"
#include "Xmd.h"
#include "Xproto.h"
#include "misc.h"
#include "fontstruct.h"
#include "dixfontstr.h"
#include "scrnintstr.h"
#include "gcstruct.h"
#include "resource.h"
#include "dix.h"
#include "cursorstr.h"
#include "opaque.h"
#include "servermd.h"


/*
    get the bits out of the font in a portable way.  to avoid
dealing with padding and such-like, we draw the glyph into
a bitmap, then read the bits out with GetImage, which
uses server-natural format.
    since all screens return the same bitmap format, we'll just use
the first one we find.
    the character origin lines up with the hotspot in the
cursor metrics.
*/

int
ServerBitsFromGlyph(pfont, ch, cm, ppbits)
    FontPtr    pfont;
    unsigned short ch;
    register CursorMetricPtr cm;
    unsigned char **ppbits;
{
    register ScreenPtr pScreen;
    register GCPtr pGC;
    xRectangle rect;
    PixmapPtr ppix;
    long nby;
    unsigned char *pbits;
    XID gcval[3];
    unsigned char char2b[2];

    /* turn glyph index into a protocol-format char2b */
    char2b[0] = (unsigned char)(ch >> 8);
    char2b[1] = (unsigned char)(ch & 0xff);

    pScreen = screenInfo.screens[0];
    nby = PixmapBytePad(cm->width, 1) * (long)cm->height;
    pbits = (unsigned char *)xalloc(nby);
    if (!pbits)
    return BadAlloc;
    /* zeroing the (pad) bits seems to help some ddx cursor handling */
    bzero((char *)pbits, nby);

    ppix = (PixmapPtr)(*pScreen->CreatePixmap)(pScreen, cm->width,
                           cm->height, 1);
    pGC = GetScratchGC(1, pScreen);
    if (!ppix || !pGC)
    {
    if (ppix)
        (*pScreen->DestroyPixmap)(ppix);
    if (pGC)
        FreeScratchGC(pGC);
    xfree(pbits);
    return BadAlloc;
    }

    rect.x = 0;
    rect.y = 0;
    rect.width = cm->width;
    rect.height = cm->height;

    /* fill the pixmap with 0 */
    gcval[0] = GXcopy;
    gcval[1] = 0;
    gcval[2] = (XID)pfont;
    DoChangeGC(pGC, GCFunction | GCForeground | GCFont, gcval, 1);
    ValidateGC((DrawablePtr)ppix, pGC);
    (*pGC->ops->PolyFillRect)(ppix, pGC, 1, &rect);

    /* draw the glyph */
    gcval[0] = 1;
    DoChangeGC(pGC, GCForeground, gcval, 0);
    ValidateGC((DrawablePtr)ppix, pGC);
    (*pGC->ops->PolyText16)(ppix, pGC, cm->xhot, cm->yhot, 1, char2b);
    (*pScreen->GetImage)(ppix, 0, 0, cm->width, cm->height,
             ZPixmap, 1, pbits);
    *ppbits = pbits;
    FreeScratchGC(pGC);
    (*pScreen->DestroyPixmap)(ppix);
    return Success;
}


Bool
CursorMetricsFromGlyph( pfont, ch, cm)
    register FontPtr     pfont;
    unsigned        ch;
    register CursorMetricPtr cm;
{
    CharInfoPtr     pci;
    int            nglyphs;
    CARD8        chs[2];
    FontEncoding    encoding;

    chs[0] = ch >> 8;
    chs[1] = ch;
    encoding = (FONTLASTROW(pfont) == 0) ? Linear16Bit : TwoD16Bit;
    if (encoding == Linear16Bit)
    {
    if (ch < pfont->info.firstCol || pfont->info.lastCol < ch)
        return FALSE;
    }
    else
    {
    if (chs[0] < pfont->info.firstRow || pfont->info.lastRow < chs[0])
        return FALSE;
    if (chs[1] < pfont->info.firstCol || pfont->info.lastCol < chs[1])
        return FALSE;
    }
    (*pfont->get_glyphs) (pfont, 1, chs, encoding, &nglyphs, &pci);
    if (nglyphs == 0)
    return FALSE;
    cm->width = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
    cm->height = pci->metrics.descent + pci->metrics.ascent;
    if (pci->metrics.leftSideBearing > 0)
    {
    cm->width += pci->metrics.leftSideBearing;
    cm->xhot = 0;
    }
    else
    {
    cm->xhot = -pci->metrics.leftSideBearing;
    if (pci->metrics.rightSideBearing < 0)
        cm->width -= pci->metrics.rightSideBearing;
    }
    if (pci->metrics.ascent < 0)
    {
    cm->height -= pci->metrics.ascent;
    cm->yhot = 0;
    }
    else
    {
    cm->yhot = pci->metrics.ascent;
    if (pci->metrics.descent < 0)
        cm->height -= pci->metrics.descent;
    }
    return TRUE;
}