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Annotation of researchv9/X11/src/X.V11R1/server/dix/glyphcurs.c, revision 1.1

1.1     ! root        1: /************************************************************************
        !             2: Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
        !             3: and the Massachusetts Institute of Technology, Cambridge, Massachusetts.
        !             4: 
        !             5:                         All Rights Reserved
        !             6: 
        !             7: Permission to use, copy, modify, and distribute this software and its 
        !             8: documentation for any purpose and without fee is hereby granted, 
        !             9: provided that the above copyright notice appear in all copies and that
        !            10: both that copyright notice and this permission notice appear in 
        !            11: supporting documentation, and that the names of Digital or MIT not be
        !            12: used in advertising or publicity pertaining to distribution of the
        !            13: software without specific, written prior permission.  
        !            14: 
        !            15: DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            16: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            17: DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            18: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            19: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            20: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            21: SOFTWARE.
        !            22: 
        !            23: ************************************************************************/
        !            24: 
        !            25: /* $Header: glyphcurs.c,v 1.8 87/09/07 18:54:49 rws Exp $ */
        !            26: 
        !            27: #include "X.h"
        !            28: #include "Xmd.h"
        !            29: #include "Xproto.h"
        !            30: #include "dixfontstr.h"
        !            31: #include "fontstruct.h"
        !            32: #include "scrnintstr.h"
        !            33: #include "gcstruct.h"
        !            34: #include "resource.h"
        !            35: #include "dix.h"
        !            36: #include "cursorstr.h"
        !            37: #include "misc.h"
        !            38: #include "opaque.h"
        !            39: #include "servermd.h"
        !            40: 
        !            41: 
        !            42: /*
        !            43:     get the bits out of the font in a portable way.  to avoid
        !            44: dealing with padding and such-like, we draw the glyph into
        !            45: a bitmap, then read the bits out with GetImage, which
        !            46: uses server-natural format.
        !            47:     since all screens return the same bitmap format, we'll just use
        !            48: the first one we find.
        !            49:     if the font isn't there, it's probably been sent from
        !            50: the mask part of CreateGlyphCursor, so we return a bitmap
        !            51: filled with 1s.
        !            52:     the character origin lines up with the hotspot in the
        !            53: cursor metrics.
        !            54: */
        !            55: 
        !            56: int
        !            57: ServerBitsFromGlyph(fontID, pfont, ch, cm, ppbits)
        !            58:     XID                fontID;
        !            59:     FontPtr    pfont;
        !            60:     unsigned short ch;
        !            61:     register CursorMetricPtr cm;
        !            62:     unsigned char **ppbits;
        !            63: {
        !            64:     register ScreenPtr pScreen;
        !            65:     register GCPtr pGC;
        !            66:     xRectangle rect;
        !            67:     PixmapPtr ppix;
        !            68:     int nby;
        !            69:     unsigned char *pbits;
        !            70:     int gcval[3];
        !            71:     unsigned char char2b[2];
        !            72: 
        !            73:     /* this takes in a short, which needs to be made into a char2b 
        !            74:        the msb of the short is byte1, the lsb is byte2
        !            75:        this is the way a short is on the 68000 anyway.  not a whole lot
        !            76:     of time here, so just do it always to cut down on extra flags in the
        !            77:     compilation.  the glyph access code might turn this all back into
        !            78:     a short; this routine takes a short for the beneffit of application
        !            79:     writers using a linear cursor font, so they don't have to think
        !            80:     about 2-byte characters.
        !            81:        sigh.
        !            82:     */
        !            83:     char2b[0] = (unsigned char)(ch >> 8);
        !            84:     char2b[1] = (unsigned char)(ch & 0xff);
        !            85: 
        !            86:     pScreen = &screenInfo.screen[0];
        !            87:     nby = PixmapBytePad(cm->width, 1) * cm->height;
        !            88:     pbits = (unsigned char *)Xalloc(nby);
        !            89:     if (!pbits)
        !            90:        return BadAlloc;
        !            91: 
        !            92:     ppix = (PixmapPtr)(*pScreen->CreatePixmap)(pScreen, cm->width,
        !            93:                                               cm->height, 1);
        !            94:     if (!ppix)
        !            95:     {
        !            96:        Xfree(pbits);
        !            97:        return BadAlloc;
        !            98:     }
        !            99:     pGC = GetScratchGC(1, pScreen);
        !           100: 
        !           101:     rect.x = 0;
        !           102:     rect.y = 0;
        !           103:     rect.width = cm->width;
        !           104:     rect.height = cm->height;
        !           105: 
        !           106:     if (!pfont)
        !           107:     {
        !           108:        /* fill the pixmap with 1 */
        !           109:        gcval[0] = GXcopy;
        !           110:        gcval[1] = 1;
        !           111:        DoChangeGC(pGC, GCFunction | GCForeground, gcval, 0);
        !           112:        ValidateGC(ppix, pGC);
        !           113:        (*pGC->PolyFillRect)(ppix, pGC, 1, &rect);
        !           114:     }
        !           115:     else
        !           116:     {
        !           117:        /* fill the pixmap with 0 */
        !           118:        gcval[0] = GXcopy;
        !           119:        gcval[1] = 0;
        !           120:        gcval[2] = fontID;
        !           121:        DoChangeGC(pGC, GCFunction | GCForeground | GCFont, gcval, 0);
        !           122:        ValidateGC(ppix, pGC);
        !           123:        (*pGC->PolyFillRect)(ppix, pGC, 1, &rect);
        !           124: 
        !           125:        /* draw the glyph */
        !           126:        gcval[0] = 1;
        !           127:        DoChangeGC(pGC, GCForeground, gcval, 0);
        !           128:        ValidateGC(ppix, pGC);
        !           129:        (*pGC->PolyText16)(ppix, pGC, cm->xhot, cm->yhot, 1, char2b);
        !           130:     }
        !           131:     (*pScreen->GetImage)(ppix, 0, 0, cm->width, cm->height,
        !           132:                         ZPixmap, 0xffffffff, pbits);
        !           133:     *ppbits = pbits;
        !           134:     FreeScratchGC(pGC);
        !           135:     (*pScreen->DestroyPixmap)(ppix);
        !           136:     return Success;
        !           137: }
        !           138: 
        !           139: 
        !           140: Bool
        !           141: CursorMetricsFromGlyph( pfont, ch, cm)
        !           142:     register FontPtr   pfont;
        !           143:     int                ch;
        !           144:     register CursorMetricPtr cm;
        !           145: {
        !           146:     register CharInfoPtr       pci = ADDRXTHISCHARINFO(pfont, ch);
        !           147: 
        !           148:     if (   ch < pfont->pFI->chFirst
        !           149:        || ch >= pfont->pFI->chFirst + n1dChars(pfont->pFI))
        !           150:     {
        !           151:        cm->width = 0;
        !           152:        cm->height = 0;
        !           153:        cm->xhot = 0;
        !           154:        cm->yhot = 0;
        !           155:        return FALSE;
        !           156:     }
        !           157:     cm->xhot = - pci->metrics.leftSideBearing;
        !           158:     cm->yhot =   pci->metrics.ascent;
        !           159:     cm->width = pci->metrics.rightSideBearing + cm->xhot;
        !           160:     cm->height = pci->metrics.descent + cm->yhot;
        !           161: 
        !           162:     return TRUE;
        !           163: }
        !           164: 
        !           165: 
        !           166: 

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