xserver/dix/glyphcurs.c

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

Copyright 1987, 1998  The Open Group

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in this Software without prior written authorization from The Open Group.

Copyright 1987 by Digital Equipment Corporation, Maynard, 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 name of Digital 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
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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;
    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];
    pbits = calloc(BitmapBytePad(cm->width), cm->height);
    if (!pbits)
        return BadAlloc;

    ppix = (PixmapPtr) (*pScreen->CreatePixmap) (pScreen, cm->width,
                                                 cm->height, 1,
                                                 CREATE_PIXMAP_USAGE_SCRATCH);
    pGC = GetScratchGC(1, pScreen);
    if (!ppix || !pGC) {
        if (ppix)
            (*pScreen->DestroyPixmap) (ppix);
        if (pGC)
            FreeScratchGC(pGC);
        free(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 = (void *) pfont;
    ChangeGC(NullClient, pGC, GCFunction | GCForeground | GCFont, gcval);
    ValidateGC((DrawablePtr) ppix, pGC);
    (*pGC->ops->PolyFillRect) ((DrawablePtr) ppix, pGC, 1, &rect);

    /* draw the glyph */
    gcval[0].val = 1;
    ChangeGC(NullClient, pGC, GCForeground, 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;
}