xorg-server-1.4/dix/glyphcurs.c

   1 /************************************************************************
   2
   3 Copyright 1987, 1998  The Open Group
   4
   5 Permission to use, copy, modify, distribute, and sell this software and its
   6 documentation for any purpose is hereby granted without fee, provided that
   7 the above copyright notice appear in all copies and that both that
   8 copyright notice and this permission notice appear in supporting
   9 documentation.
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies or substantial portions of the Software.
  13
  14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20
  21 Except as contained in this notice, the name of The Open Group shall not be
  22 used in advertising or otherwise to promote the sale, use or other dealings
  23 in this Software without prior written authorization from The Open Group.
  24
  25
  26 Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
  27
  28                         All Rights Reserved
  29
  30 Permission to use, copy, modify, and distribute this software and its
  31 documentation for any purpose and without fee is hereby granted,
  32 provided that the above copyright notice appear in all copies and that
  33 both that copyright notice and this permission notice appear in
  34 supporting documentation, and that the name of Digital not be
  35 used in advertising or publicity pertaining to distribution of the
  36 software without specific, written prior permission.
  37
  38 DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
  39 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
  40 DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
  41 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  42 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  43 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  44 SOFTWARE.
  45
  46 ************************************************************************/
  47
  48
  49 #ifdef HAVE_DIX_CONFIG_H
  50 #include <dix-config.h>
  51 #endif
  52
  53 #include "misc.h"
  54 #include <X11/fonts/fontstruct.h>
  55 #include "dixfontstr.h"
  56 #include "scrnintstr.h"
  57 #include "gcstruct.h"
  58 #include "resource.h"
  59 #include "dix.h"
  60 #include "cursorstr.h"
  61 #include "opaque.h"
  62 #include "servermd.h"
  63
  64
  65 /*
  66     get the bits out of the font in a portable way.  to avoid
  67 dealing with padding and such-like, we draw the glyph into
  68 a bitmap, then read the bits out with GetImage, which
  69 uses server-natural format.
  70     since all screens return the same bitmap format, we'll just use
  71 the first one we find.
  72     the character origin lines up with the hotspot in the
  73 cursor metrics.
  74 */
  75
  76 int
  77 ServerBitsFromGlyph(FontPtr pfont, unsigned ch, CursorMetricPtr cm, unsigned char **ppbits)
  78 {
  79     ScreenPtr pScreen;
  80     GCPtr pGC;
  81     xRectangle rect;
  82     PixmapPtr ppix;
  83     long nby;
  84     char *pbits;
  85     ChangeGCVal gcval[3];
  86     unsigned char char2b[2];
  87
  88     /* turn glyph index into a protocol-format char2b */
  89     char2b[0] = (unsigned char)(ch >> 8);
  90     char2b[1] = (unsigned char)(ch & 0xff);
  91
  92     pScreen = screenInfo.screens[0];
  93     nby = BitmapBytePad(cm->width) * (long)cm->height;
  94     pbits = (char *)xalloc(nby);
  95     if (!pbits)
  96         return BadAlloc;
  97     /* zeroing the (pad) bits seems to help some ddx cursor handling */
  98     bzero(pbits, nby);
  99
 100     ppix = (PixmapPtr)(*pScreen->CreatePixmap)(pScreen, cm->width,
 101                                                cm->height, 1);
 102     pGC = GetScratchGC(1, pScreen);
 103     if (!ppix || !pGC)
 104     {
 105         if (ppix)
 106             (*pScreen->DestroyPixmap)(ppix);
 107         if (pGC)
 108             FreeScratchGC(pGC);
 109         xfree(pbits);
 110         return BadAlloc;
 111     }
 112
 113     rect.x = 0;
 114     rect.y = 0;
 115     rect.width = cm->width;
 116     rect.height = cm->height;
 117
 118     /* fill the pixmap with 0 */
 119     gcval[0].val = GXcopy;
 120     gcval[1].val = 0;
 121     gcval[2].ptr = (pointer)pfont;
 122     dixChangeGC(NullClient, pGC, GCFunction | GCForeground | GCFont,
 123                 NULL, gcval);
 124     ValidateGC((DrawablePtr)ppix, pGC);
 125     (*pGC->ops->PolyFillRect)((DrawablePtr)ppix, pGC, 1, &rect);
 126
 127     /* draw the glyph */
 128     gcval[0].val = 1;
 129     dixChangeGC(NullClient, pGC, GCForeground, NULL, gcval);
 130     ValidateGC((DrawablePtr)ppix, pGC);
 131     (*pGC->ops->PolyText16)((DrawablePtr)ppix, pGC, cm->xhot, cm->yhot,
 132                             1, (unsigned short *)char2b);
 133     (*pScreen->GetImage)((DrawablePtr)ppix, 0, 0, cm->width, cm->height,
 134                          XYPixmap, 1, pbits);
 135     *ppbits = (unsigned char *)pbits;
 136     FreeScratchGC(pGC);
 137     (*pScreen->DestroyPixmap)(ppix);
 138     return Success;
 139 }
 140
 141
 142 Bool
 143 CursorMetricsFromGlyph(FontPtr pfont, unsigned ch, CursorMetricPtr cm)
 144 {
 145     CharInfoPtr         pci;
 146     unsigned long       nglyphs;
 147     CARD8               chs[2];
 148     FontEncoding        encoding;
 149
 150     chs[0] = ch >> 8;
 151     chs[1] = ch;
 152     encoding = (FONTLASTROW(pfont) == 0) ? Linear16Bit : TwoD16Bit;
 153     if (encoding == Linear16Bit)
 154     {
 155         if (ch < pfont->info.firstCol || pfont->info.lastCol < ch)
 156             return FALSE;
 157     }
 158     else
 159     {
 160         if (chs[0] < pfont->info.firstRow || pfont->info.lastRow < chs[0])
 161             return FALSE;
 162         if (chs[1] < pfont->info.firstCol || pfont->info.lastCol < chs[1])
 163             return FALSE;
 164     }
 165     (*pfont->get_glyphs) (pfont, 1, chs, encoding, &nglyphs, &pci);
 166     if (nglyphs == 0)
 167         return FALSE;
 168     cm->width = pci->metrics.rightSideBearing - pci->metrics.leftSideBearing;
 169     cm->height = pci->metrics.descent + pci->metrics.ascent;
 170     if (pci->metrics.leftSideBearing > 0)
 171     {
 172         cm->width += pci->metrics.leftSideBearing;
 173         cm->xhot = 0;
 174     }
 175     else
 176     {
 177         cm->xhot = -pci->metrics.leftSideBearing;
 178         if (pci->metrics.rightSideBearing < 0)
 179             cm->width -= pci->metrics.rightSideBearing;
 180     }
 181     if (pci->metrics.ascent < 0)
 182     {
 183         cm->height -= pci->metrics.ascent;
 184         cm->yhot = 0;
 185     }
 186     else
 187     {
 188         cm->yhot = pci->metrics.ascent;
 189         if (pci->metrics.descent < 0)
 190             cm->height -= pci->metrics.descent;
 191     }
 192     return TRUE;
 193 }