diff options
Diffstat (limited to 'mfb/mfbbresd.c')
| -rw-r--r-- | mfb/mfbbresd.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/mfb/mfbbresd.c b/mfb/mfbbresd.c new file mode 100644 index 000000000..f71070773 --- /dev/null +++ b/mfb/mfbbresd.c @@ -0,0 +1,204 @@ +/*********************************************************** + +Copyright 1987, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + + +Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Digital not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +******************************************************************/ +/* $Xorg: mfbbresd.c,v 1.4 2001/02/09 02:05:18 xorgcvs Exp $ */ +#include "X.h" +#include "misc.h" +#include "mfb.h" +#include "maskbits.h" +#include "miline.h" + +/* Dashed bresenham line */ + +#define StepDash\ + if (!--dashRemaining) { \ + if (++ dashIndex == numInDashList) \ + dashIndex = 0; \ + dashRemaining = pDash[dashIndex]; \ + rop = fgrop; \ + if (dashIndex & 1) \ + rop = bgrop; \ + } + +void +mfbBresD(fgrop, bgrop, + pdashIndex, pDash, numInDashList, pdashOffset, isDoubleDash, + addrlbase, nlwidth, + signdx, signdy, axis, x1, y1, e, e1, e2, len) +int fgrop, bgrop; +int *pdashIndex; /* current dash */ +unsigned char *pDash; /* dash list */ +int numInDashList; /* total length of dash list */ +int *pdashOffset; /* offset into current dash */ +int isDoubleDash; +PixelType *addrlbase; /* pointer to base of bitmap */ +int nlwidth; /* width in longwords of bitmap */ +int signdx, signdy; /* signs of directions */ +int axis; /* major axis (Y_AXIS or X_AXIS) */ +int x1, y1; /* initial point */ +register int e; /* error accumulator */ +register int e1; /* bresenham increments */ +int e2; +int len; /* length of line */ +{ + register int yinc; /* increment to next scanline, in bytes */ + register PixelType *addrl; + register int e3 = e2-e1; + register unsigned long bit; + PixelType leftbit = mask[0]; /* leftmost bit to process in new word */ + PixelType rightbit = mask[PPW-1]; /* rightmost bit to process in new word */ + int dashIndex; + int dashOffset; + int dashRemaining; + int rop; + + dashOffset = *pdashOffset; + dashIndex = *pdashIndex; + dashRemaining = pDash[dashIndex] - dashOffset; + rop = fgrop; + if (!isDoubleDash) + bgrop = -1; + if (dashIndex & 1) + rop = bgrop; + + /* point to longword containing first point */ + addrl = mfbScanline(addrlbase, x1, y1, nlwidth); + yinc = signdy * nlwidth; + e = e-e1; /* to make looping easier */ + bit = mask[x1 & PIM]; + if (axis == X_AXIS) + { + if (signdx > 0) + { + while(len--) + { + if (rop == RROP_BLACK) + *addrl &= ~bit; + else if (rop == RROP_WHITE) + *addrl |= bit; + else if (rop == RROP_INVERT) + *addrl ^= bit; + e += e1; + if (e >= 0) + { + mfbScanlineInc(addrl, yinc); + e += e3; + } + bit = SCRRIGHT(bit,1); + if (!bit) { bit = leftbit;addrl ++; } + StepDash + } + } + else + { + while(len--) + { + if (rop == RROP_BLACK) + *addrl &= ~bit; + else if (rop == RROP_WHITE) + *addrl |= bit; + else if (rop == RROP_INVERT) + *addrl ^= bit; + e += e1; + if (e >= 0) + { + mfbScanlineInc(addrl, yinc); + e += e3; + } + bit = SCRLEFT(bit,1); + if (!bit) { bit = rightbit;addrl --; } + StepDash + } + } + } /* if X_AXIS */ + else + { + if (signdx > 0) + { + while(len--) + { + if (rop == RROP_BLACK) + *addrl &= ~bit; + else if (rop == RROP_WHITE) + *addrl |= bit; + else if (rop == RROP_INVERT) + *addrl ^= bit; + e += e1; + if (e >= 0) + { + bit = SCRRIGHT(bit,1); + if (!bit) { bit = leftbit;addrl ++; } + e += e3; + } + mfbScanlineInc(addrl, yinc); + StepDash + } + } + else + { + while(len--) + { + if (rop == RROP_BLACK) + *addrl &= ~bit; + else if (rop == RROP_WHITE) + *addrl |= bit; + else if (rop == RROP_INVERT) + *addrl ^= bit; + e += e1; + if (e >= 0) + { + bit = SCRLEFT(bit,1); + if (!bit) { bit = rightbit;addrl --; } + e += e3; + } + mfbScanlineInc(addrl, yinc); + StepDash + } + } + } /* else Y_AXIS */ + *pdashIndex = dashIndex; + *pdashOffset = pDash[dashIndex] - dashRemaining; +} |