xref: /xsrc/external/mit/xorg-server/dist/dix/glyphcurs.c

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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
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#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include "misc.h"
#include <X11/fonts/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(FontPtr pfont, unsigned ch, CursorMetricPtr cm, unsigned char **ppbits)
{
    ScreenPtr pScreen;
    GCPtr pGC;
    xRectangle rect;
    PixmapPtr ppix;
    long nby;
    char *pbits;
    ChangeGCVal 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 = BitmapBytePad(cm->width) * (long)cm->height;
    pbits = (char *)xalloc(nby);
    if (!pbits)
	return BadAlloc;
    /* zeroing the (pad) bits seems to help some ddx cursor handling */
    bzero(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].val = GXcopy;
    gcval[1].val = 0;
    gcval[2].ptr = (pointer)pfont;
    dixChangeGC(NullClient, pGC, GCFunction | GCForeground | GCFont,
		NULL, gcval);
    ValidateGC((DrawablePtr)ppix, pGC);
    (*pGC->ops->PolyFillRect)((DrawablePtr)ppix, pGC, 1, &rect);

    /* draw the glyph */
    gcval[0].val = 1;
    dixChangeGC(NullClient, pGC, GCForeground, NULL, gcval);
    ValidateGC((DrawablePtr)ppix, pGC);
    (*pGC->ops->PolyText16)((DrawablePtr)ppix, pGC, cm->xhot, cm->yhot,
			    1, (unsigned short *)char2b);
    (*pScreen->GetImage)((DrawablePtr)ppix, 0, 0, cm->width, cm->height,
			 XYPixmap, 1, pbits);
    *ppbits = (unsigned char *)pbits;
    FreeScratchGC(pGC);
    (*pScreen->DestroyPixmap)(ppix);
    return Success;
}


Bool
CursorMetricsFromGlyph(FontPtr pfont, unsigned ch, CursorMetricPtr cm)
{
    CharInfoPtr 	pci;
    unsigned long	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;
}