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