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Annotation of researchv9/X11/src/X.V11R1/server/ddx/cfb/cfbmisc.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: #include "X.h"
        !            26: #include "misc.h"
        !            27: #include "cursor.h"
        !            28: #include "screenint.h"
        !            29: 
        !            30: #include "cfb.h"
        !            31: 
        !            32: void cfbQueryBestSize(class, pwidth, pheight)
        !            33: int class;
        !            34: short *pwidth;
        !            35: short *pheight;
        !            36: {
        !            37:     unsigned width, test;
        !            38: 
        !            39:     switch(class)
        !            40:     {
        !            41:       case CursorShape:
        !            42:          *pwidth = 16;
        !            43:          *pheight = 16;
        !            44:          break;
        !            45:       case TileShape:
        !            46:       case StippleShape:
        !            47:          width = *pwidth;
        !            48:          /* Return the closes power of two not less than what they gave me */
        !            49:          test = 0x80000000;
        !            50:          /* Find the highest 1 bit in the width given */
        !            51:          while(!(test & width))
        !            52:             test >>= 1;
        !            53:          /* If their number is greater than that, bump up to the next
        !            54:           *  power of two */
        !            55:          if((test - 1) & width)
        !            56:             test <<= 1;
        !            57:          *pwidth = test;
        !            58:          /* We don't care what height they use */
        !            59:          break;
        !            60:     }
        !            61: }
        !            62: 

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