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Annotation of researchv9/X11/src/X.V11R1/server/ddx/mfb/mfbhrzvert.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: /* $Header: mfbhrzvert.c,v 1.8 87/09/11 07:48:42 toddb Exp $ */
        !            25: #include "X.h"
        !            26: 
        !            27: #include "gc.h"
        !            28: #include "window.h"
        !            29: #include "pixmap.h"
        !            30: #include "region.h"
        !            31: 
        !            32: #include "mfb.h"
        !            33: #include "maskbits.h"
        !            34: 
        !            35: /* horizontal solid line
        !            36:    abs(len) > 1
        !            37: */
        !            38: mfbHorzS(rop, addrl, nlwidth, x1, y1, len)
        !            39: int rop;               /* a reduced rasterop */
        !            40: register int *addrl;   /* pointer to base of bitmap */
        !            41: register int nlwidth;  /* width in longwords of bitmap */
        !            42: int x1;                        /* initial point */ 
        !            43: int y1;
        !            44: int len;               /* length of line */
        !            45: {
        !            46:     register int startmask;
        !            47:     register int endmask;
        !            48:     register int nlmiddle;
        !            49: 
        !            50: 
        !            51:     /* force the line to go left to right
        !            52:        but don't draw the last point
        !            53:     */
        !            54:     if (len < 0)
        !            55:     {
        !            56:        x1 += len;
        !            57:        x1 += 1;
        !            58:        len = -len;
        !            59:     }
        !            60: 
        !            61:     addrl = addrl + (y1 * nlwidth) + (x1 >> 5);
        !            62: 
        !            63:     /* all bits inside same longword */
        !            64:     if ( ((x1 & 0x1f) + len) < 32)
        !            65:     {
        !            66:        maskpartialbits(x1, len, startmask);
        !            67:         if (rop == RROP_BLACK)
        !            68:         {
        !            69:            *addrl &= ~startmask;
        !            70:         }
        !            71:         else if (rop == RROP_WHITE)
        !            72:         {
        !            73:            *addrl |= startmask;
        !            74:         }
        !            75:         else if (rop == RROP_INVERT)
        !            76:         {
        !            77:            *addrl ^= startmask;
        !            78:         }
        !            79:     }
        !            80:     else
        !            81:     {
        !            82:        maskbits(x1, len, startmask, endmask, nlmiddle);
        !            83:         if (rop == RROP_BLACK)
        !            84:         {
        !            85:            if (startmask)
        !            86:                *addrl++ &= ~startmask;
        !            87:            while (nlmiddle--)
        !            88:                *addrl++ = 0x0;
        !            89:            if (endmask)
        !            90:                *addrl &= ~endmask;
        !            91:         }
        !            92:         else if (rop == RROP_WHITE)
        !            93:         {
        !            94:            if (startmask)
        !            95:                *addrl++ |= startmask;
        !            96:            while (nlmiddle--)
        !            97:                *addrl++ = 0xffffffff;
        !            98:            if (endmask)
        !            99:                *addrl |= endmask;
        !           100:         }
        !           101:         else if (rop == RROP_INVERT)
        !           102:         {
        !           103:            if (startmask)
        !           104:                *addrl++ ^= startmask;
        !           105:            while (nlmiddle--)
        !           106:                *addrl++ ^= 0xffffffff;
        !           107:            if (endmask)
        !           108:                *addrl ^= endmask;
        !           109:         }
        !           110:     }
        !           111: }
        !           112: 
        !           113: /* vertical solid line
        !           114:    this uses do loops because pcc (Ultrix 1.2, bsd 4.2) generates
        !           115:    better code.  sigh.  we know that len will never be 0 or 1, so
        !           116:    it's OK to use it.
        !           117: */
        !           118: 
        !           119: mfbVertS(rop, addrl, nlwidth, x1, y1, len)
        !           120: int rop;               /* a reduced rasterop */
        !           121: register int *addrl;   /* pointer to base of bitmap */
        !           122: register int nlwidth;  /* width in longwords of bitmap */
        !           123: int x1, y1;            /* initial point */
        !           124: register int len;      /* length of line */
        !           125: {
        !           126:     register int bitmask;
        !           127: 
        !           128:     addrl = addrl + (y1 * nlwidth) + (x1 >> 5);
        !           129: 
        !           130:     if (len < 0)
        !           131:     {
        !           132:        nlwidth = -nlwidth;
        !           133:        len = -len;
        !           134:     }
        !           135:  
        !           136:     if (rop == RROP_BLACK)
        !           137:     {
        !           138:        bitmask = rmask[x1&0x1f];
        !           139:        do
        !           140:        {
        !           141:            *addrl &= bitmask;
        !           142:            addrl += nlwidth;
        !           143:        }
        !           144:        while (--len);
        !           145:     }
        !           146:     else if (rop == RROP_WHITE)
        !           147:     {
        !           148:        bitmask = mask[x1&0x1f];
        !           149:        do
        !           150:        {
        !           151:            *addrl |= bitmask;
        !           152:            addrl += nlwidth;
        !           153:        }
        !           154:        while (--len);
        !           155:     }
        !           156:     else if (rop == RROP_INVERT)
        !           157:     {
        !           158:        bitmask = mask[x1&0x1f];
        !           159:        do
        !           160:        {
        !           161:            *addrl ^= bitmask;
        !           162:            addrl += nlwidth;
        !           163:        }
        !           164:        while (--len);
        !           165:     }
        !           166: }
        !           167: 

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