ref: b76e8ecc732cb311ceee6fd6c807b7e784d3fe31
dir: /sys/src/ape/X11/cmd/X/cfb/cfbbresd.c/
/***********************************************************
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.
******************************************************************/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <X11/X.h>
#include "misc.h"
#include "cfb.h"
#include "cfbmskbits.h"
#include "miline.h"
/* Dashed bresenham line */
void
cfbBresD(rrops,
pdashIndex, pDash, numInDashList, pdashOffset, isDoubleDash,
addrl, nlwidth,
signdx, signdy, axis, x1, y1, e, e1, e2, len)
cfbRRopPtr rrops;
int *pdashIndex; /* current dash */
unsigned char *pDash; /* dash list */
int numInDashList; /* total length of dash list */
int *pdashOffset; /* offset into current dash */
int isDoubleDash;
CfbBits *addrl; /* 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 */
{
#ifdef PIXEL_ADDR
register PixelType *addrp;
#endif
register int e3 = e2-e1;
int dashIndex;
int dashOffset;
int dashRemaining;
CfbBits xorFg, andFg, xorBg, andBg;
Bool isCopy;
int thisDash;
#if PSZ == 24
CfbBits xorPiQxlFg[3], andPiQxlFg[3], xorPiQxlBg[3], andPiQxlBg[3];
char *addrb;
int signdx3, signdy3;
#endif
dashOffset = *pdashOffset;
dashIndex = *pdashIndex;
isCopy = (rrops[0].rop == GXcopy && rrops[1].rop == GXcopy);
#if PSZ == 24
xorFg = rrops[0].xor & 0xffffff;
andFg = rrops[0].and & 0xffffff;
xorBg = rrops[1].xor & 0xffffff;
andBg = rrops[1].and & 0xffffff;
xorPiQxlFg[0] = xorFg | (xorFg << 24);
xorPiQxlFg[1] = (xorFg >> 8) | (xorFg << 16);
xorPiQxlFg[2] = (xorFg >> 16) | (xorFg << 8);
andPiQxlFg[0] = andFg | (andFg << 24);
andPiQxlFg[1] = (andFg >> 8) | (andFg << 16);
andPiQxlFg[2] = (andFg >> 16) | (andFg << 8);
xorPiQxlBg[0] = xorBg | (xorBg << 24);
xorPiQxlBg[1] = (xorBg >> 8) | (xorBg << 16);
xorPiQxlBg[2] = (xorBg >> 16) | (xorBg << 8);
andPiQxlBg[0] = andBg | (andBg << 24);
andPiQxlBg[1] = (andBg >> 8) | (andBg << 16);
andPiQxlBg[2] = (andFg >> 16) | (andBg << 8);
#else
xorFg = rrops[0].xor;
andFg = rrops[0].and;
xorBg = rrops[1].xor;
andBg = rrops[1].and;
#endif
dashRemaining = pDash[dashIndex] - dashOffset;
if ((thisDash = dashRemaining) >= len)
{
thisDash = len;
dashRemaining -= len;
}
e = e-e1; /* to make looping easier */
#define BresStep(minor,major) {if ((e += e1) >= 0) { e += e3; minor; } major;}
#define NextDash {\
dashIndex++; \
if (dashIndex == numInDashList) \
dashIndex = 0; \
dashRemaining = pDash[dashIndex]; \
if ((thisDash = dashRemaining) >= len) \
{ \
dashRemaining -= len; \
thisDash = len; \
} \
}
#ifdef PIXEL_ADDR
#if PSZ == 24
#define Loop(store) while (thisDash--) {\
store; \
BresStep(addrb+=signdy3,addrb+=signdx3) \
}
/* point to first point */
nlwidth <<= PWSH;
addrp = (PixelType *)(addrl) + (y1 * nlwidth);
addrb = (char *)addrp + x1 * 3;
#else
#define Loop(store) while (thisDash--) {\
store; \
BresStep(addrp+=signdy,addrp+=signdx) \
}
/* point to first point */
nlwidth <<= PWSH;
addrp = (PixelType *)(addrl) + (y1 * nlwidth) + x1;
#endif
signdy *= nlwidth;
#if PSZ == 24
signdx3 = signdx * 3;
signdy3 = signdy * sizeof (CfbBits);
#endif
if (axis == Y_AXIS)
{
int t;
t = signdx;
signdx = signdy;
signdy = t;
#if PSZ == 24
t = signdx3;
signdx3 = signdy3;
signdy3 = t;
#endif
}
if (isCopy)
{
#if PSZ == 24
#define body_copy(pix) { \
addrp = (PixelType *)((unsigned long)addrb & ~0x03); \
switch((unsigned long)addrb & 3){ \
case 0: \
*addrp = (*addrp & 0xFF000000)|((pix)[0] & 0xFFFFFF); \
break; \
case 1: \
*addrp = (*addrp & 0xFF)|((pix)[2] & 0xFFFFFF00); \
break; \
case 3: \
*addrp = (*addrp & 0xFFFFFF)|((pix)[0] & 0xFF000000); \
*(addrp+1) = (*(addrp+1) & 0xFFFF0000)|((pix)[1] & 0xFFFF); \
break; \
case 2: \
*addrp = (*addrp & 0xFFFF)|((pix)[1] & 0xFFFF0000); \
*(addrp+1) = (*(addrp+1) & 0xFFFFFF00)|((pix)[2] & 0xFF); \
break; \
} \
}
#endif /* PSZ == 24 */
for (;;)
{
len -= thisDash;
if (dashIndex & 1) {
if (isDoubleDash) {
#if PSZ == 24
Loop(body_copy(xorPiQxlBg))
#else
Loop(*addrp = xorBg)
#endif
} else {
Loop(;)
}
} else {
#if PSZ == 24
Loop(body_copy(xorPiQxlFg))
#else
Loop(*addrp = xorFg)
#endif
}
if (!len)
break;
NextDash
}
#undef body_copy
}
else
{
#define body_set(and, xor) { \
addrp = (PixelType *)((unsigned long)addrb & ~0x03); \
switch((unsigned long)addrb & 3){ \
case 0: \
*addrp = (*addrp & ((and)[0]|0xFF000000)) ^ ((xor)[0] & 0xFFFFFF); \
break; \
case 1: \
*addrp = (*addrp & ((and)[2]|0xFF)) ^ ((xor)[2] & 0xFFFFFF00); \
break; \
case 3: \
*addrp = (*addrp & ((and)[0]|0xFFFFFF)) ^ ((xor)[0] & 0xFF000000); \
*(addrp+1)=(*(addrp+1)&((and)[1]|0xFFFF0000)) ^ ((xor)[1]&0xFFFF); \
break; \
case 2: \
*addrp = (*addrp & ((and)[1]|0xFFFF)) ^ ((xor)[1] & 0xFFFF0000); \
*(addrp+1)=(*(addrp+1)&((and)[2]|0xFFFFFF00)) ^ ((xor)[2] & 0xFF); \
break; \
} \
}
for (;;)
{
len -= thisDash;
if (dashIndex & 1) {
if (isDoubleDash) {
#if PSZ == 24
Loop(body_set(andPiQxlBg, xorPiQxlBg))
#else
Loop(*addrp = DoRRop(*addrp,andBg, xorBg))
#endif
} else {
Loop(;)
}
} else {
#if PSZ == 24
Loop(body_set(andPiQxlFg, xorPiQxlFg))
#else
Loop(*addrp = DoRRop(*addrp,andFg, xorFg))
#endif
}
if (!len)
break;
NextDash
}
#undef body_set
}
#else /* !PIXEL_ADDR */
{
register CfbBits tmp;
CfbBits startbit, bit;
/* point to longword containing first point */
#if PSZ == 24
addrl = (addrl + (y1 * nlwidth) + ((x1*3) >> 2);
#else
addrl = (addrl + (y1 * nlwidth) + (x1 >> PWSH));
#endif
signdy = signdy * nlwidth;
if (signdx > 0)
startbit = cfbmask[0];
else
#if PSZ == 24
startbit = cfbmask[(PPW-1)<<1];
bit = cfbmask[(x1 & 3)<<1];
#else
startbit = cfbmask[PPW-1];
bit = cfbmask[x1 & PIM];
#endif
#if PSZ == 24
#define X_Loop(store) while(thisDash--) {\
store; \
BresStep(addrl += signdy, \
if (signdx > 0) \
bit = SCRRIGHT(bit,1); \
else \
bit = SCRLEFT(bit,1); \
if (!bit) \
{ \
bit = startbit; \
addrl += signdx; \
}) \
}
#define Y_Loop(store) while(thisDash--) {\
store; \
BresStep(if (signdx > 0) \
bit = SCRRIGHT(bit,1); \
else \
bit = SCRLEFT(bit,1); \
if (!bit) \
{ \
bit = startbit; \
addrl += signdx; \
}, \
addrl += signdy) \
}
#else
#define X_Loop(store) while(thisDash--) {\
store; \
BresStep(addrl += signdy, \
if (signdx > 0) \
bit = SCRRIGHT(bit,1); \
else \
bit = SCRLEFT(bit,1); \
if (!bit) \
{ \
bit = startbit; \
addrl += signdx; \
}) \
}
#define Y_Loop(store) while(thisDash--) {\
store; \
BresStep(if (signdx > 0) \
bit = SCRRIGHT(bit,1); \
else \
bit = SCRLEFT(bit,1); \
if (!bit) \
{ \
bit = startbit; \
addrl += signdx; \
}, \
addrl += signdy) \
}
#endif
if (axis == X_AXIS)
{
for (;;)
{
len -= thisDash;
if (dashIndex & 1) {
if (isDoubleDash) {
X_Loop(*addrl = DoMaskRRop(*addrl, andBg, xorBg, bit));
} else {
X_Loop(;)
}
} else {
X_Loop(*addrl = DoMaskRRop(*addrl, andFg, xorFg, bit));
}
if (!len)
break;
NextDash
}
} /* if X_AXIS */
else
{
for (;;)
{
len -= thisDash;
if (dashIndex & 1) {
if (isDoubleDash) {
Y_Loop(*addrl = DoMaskRRop(*addrl, andBg, xorBg, bit));
} else {
Y_Loop(;)
}
} else {
Y_Loop(*addrl = DoMaskRRop(*addrl, andFg, xorFg, bit));
}
if (!len)
break;
NextDash
}
} /* else Y_AXIS */
}
#endif
*pdashIndex = dashIndex;
*pdashOffset = pDash[dashIndex] - dashRemaining;
}