R6.6 is the Xorg base-line
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Kaleb Keithley
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dix/glyphcurs.c
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197
dix/glyphcurs.c
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/************************************************************************
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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************************************************************************/
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/* $Xorg: glyphcurs.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */
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#include "misc.h"
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#include "fontstruct.h"
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#include "dixfontstr.h"
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#include "scrnintstr.h"
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#include "gcstruct.h"
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#include "resource.h"
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#include "dix.h"
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#include "cursorstr.h"
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#include "opaque.h"
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#include "servermd.h"
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/*
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get the bits out of the font in a portable way. to avoid
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dealing with padding and such-like, we draw the glyph into
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a bitmap, then read the bits out with GetImage, which
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uses server-natural format.
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since all screens return the same bitmap format, we'll just use
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the first one we find.
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the character origin lines up with the hotspot in the
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cursor metrics.
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*/
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int
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ServerBitsFromGlyph(pfont, ch, cm, ppbits)
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FontPtr pfont;
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unsigned int ch;
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register CursorMetricPtr cm;
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unsigned char **ppbits;
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{
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register ScreenPtr pScreen;
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register GCPtr pGC;
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xRectangle rect;
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PixmapPtr ppix;
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long nby;
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char *pbits;
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ChangeGCVal gcval[3];
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unsigned char char2b[2];
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/* turn glyph index into a protocol-format char2b */
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char2b[0] = (unsigned char)(ch >> 8);
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char2b[1] = (unsigned char)(ch & 0xff);
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pScreen = screenInfo.screens[0];
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nby = BitmapBytePad(cm->width) * (long)cm->height;
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pbits = (char *)xalloc(nby);
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if (!pbits)
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return BadAlloc;
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/* zeroing the (pad) bits seems to help some ddx cursor handling */
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bzero(pbits, nby);
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ppix = (PixmapPtr)(*pScreen->CreatePixmap)(pScreen, cm->width,
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cm->height, 1);
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pGC = GetScratchGC(1, pScreen);
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if (!ppix || !pGC)
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{
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if (ppix)
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(*pScreen->DestroyPixmap)(ppix);
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if (pGC)
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FreeScratchGC(pGC);
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xfree(pbits);
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return BadAlloc;
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}
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rect.x = 0;
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rect.y = 0;
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rect.width = cm->width;
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rect.height = cm->height;
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/* fill the pixmap with 0 */
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gcval[0].val = GXcopy;
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gcval[1].val = 0;
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gcval[2].ptr = (pointer)pfont;
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dixChangeGC(NullClient, pGC, GCFunction | GCForeground | GCFont,
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NULL, gcval);
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ValidateGC((DrawablePtr)ppix, pGC);
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(*pGC->ops->PolyFillRect)((DrawablePtr)ppix, pGC, 1, &rect);
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/* draw the glyph */
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gcval[0].val = 1;
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dixChangeGC(NullClient, pGC, GCForeground, NULL, gcval);
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ValidateGC((DrawablePtr)ppix, pGC);
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(*pGC->ops->PolyText16)((DrawablePtr)ppix, pGC, cm->xhot, cm->yhot,
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1, (unsigned short *)char2b);
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(*pScreen->GetImage)((DrawablePtr)ppix, 0, 0, cm->width, cm->height,
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XYPixmap, 1, pbits);
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*ppbits = (unsigned char *)pbits;
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FreeScratchGC(pGC);
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(*pScreen->DestroyPixmap)(ppix);
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return Success;
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}
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Bool
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CursorMetricsFromGlyph( pfont, ch, cm)
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register FontPtr pfont;
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unsigned ch;
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register CursorMetricPtr cm;
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{
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CharInfoPtr pci;
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unsigned long nglyphs;
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CARD8 chs[2];
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FontEncoding encoding;
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chs[0] = ch >> 8;
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chs[1] = ch;
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encoding = (FONTLASTROW(pfont) == 0) ? Linear16Bit : TwoD16Bit;
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if (encoding == Linear16Bit)
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{
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if (ch < pfont->info.firstCol || pfont->info.lastCol < ch)
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return FALSE;
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}
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else
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{
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if (chs[0] < pfont->info.firstRow || pfont->info.lastRow < chs[0])
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return FALSE;
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if (chs[1] < pfont->info.firstCol || pfont->info.lastCol < chs[1])
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return FALSE;
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}
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(*pfont->get_glyphs) (pfont, 1, chs, encoding, &nglyphs, &pci);
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if (nglyphs == 0)
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return FALSE;
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cm->width = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
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cm->height = pci->metrics.descent + pci->metrics.ascent;
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if (pci->metrics.leftSideBearing > 0)
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{
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cm->width += pci->metrics.leftSideBearing;
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cm->xhot = 0;
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}
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else
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{
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cm->xhot = -pci->metrics.leftSideBearing;
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if (pci->metrics.rightSideBearing < 0)
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cm->width -= pci->metrics.rightSideBearing;
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}
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if (pci->metrics.ascent < 0)
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{
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cm->height -= pci->metrics.ascent;
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cm->yhot = 0;
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}
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else
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{
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cm->yhot = pci->metrics.ascent;
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if (pci->metrics.descent < 0)
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cm->height -= pci->metrics.descent;
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}
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return TRUE;
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}
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