R6.6 is the Xorg base-line
This commit is contained in:
Kaleb Keithley
253
mfb/mfbzerarc.c
Normal file
253
mfb/mfbzerarc.c
Normal file
@@ -0,0 +1,253 @@
|
||||
/************************************************************
|
||||
|
||||
Copyright 1989, 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.
|
||||
|
||||
********************************************************/
|
||||
|
||||
/* $Xorg: mfbzerarc.c,v 1.4 2001/02/09 02:05:19 xorgcvs Exp $ */
|
||||
|
||||
/* Derived from:
|
||||
* "Algorithm for drawing ellipses or hyperbolae with a digital plotter"
|
||||
* by M. L. V. Pitteway
|
||||
* The Computer Journal, November 1967, Volume 10, Number 3, pp. 282-289
|
||||
*/
|
||||
|
||||
#include "X.h"
|
||||
#include "Xprotostr.h"
|
||||
#include "miscstruct.h"
|
||||
#include "gcstruct.h"
|
||||
#include "pixmapstr.h"
|
||||
#include "scrnintstr.h"
|
||||
#include "mfb.h"
|
||||
#include "maskbits.h"
|
||||
#include "mizerarc.h"
|
||||
#include "mi.h"
|
||||
|
||||
/*
|
||||
* Note: LEFTMOST must be the bit leftmost in the actual screen
|
||||
* representation. This depends also on the IMAGE_BYTE_ORDER.
|
||||
* LONG2CHARS() takes care of the re-ordering as required. (DHD)
|
||||
*/
|
||||
#if (BITMAP_BIT_ORDER == MSBFirst)
|
||||
#define LEFTMOST ((PixelType) LONG2CHARS((1 << PLST)))
|
||||
#else
|
||||
#define LEFTMOST ((PixelType) LONG2CHARS(1))
|
||||
#endif
|
||||
|
||||
#define PixelateWhite(addr,yoff,xoff) \
|
||||
*mfbScanlineOffset(addr, (yoff)+((xoff)>>PWSH)) |= \
|
||||
SCRRIGHT (LEFTMOST, ((xoff) & PIM))
|
||||
#define PixelateBlack(addr,yoff,xoff) \
|
||||
*mfbScanlineOffset(addr, (yoff)+((xoff)>>PWSH)) &= \
|
||||
~(SCRRIGHT (LEFTMOST, ((xoff) & PIM)))
|
||||
|
||||
#define Pixelate(base,yoff,xoff) \
|
||||
{ \
|
||||
paddr = mfbScanlineOffset(base, (yoff) + ((xoff)>>PWSH)); \
|
||||
pmask = SCRRIGHT(LEFTMOST, (xoff) & PIM); \
|
||||
*paddr = (*paddr & ~pmask) | (pixel & pmask); \
|
||||
}
|
||||
|
||||
#define DoPix(bit,base,yoff,xoff) if (mask & bit) Pixelate(base,yoff,xoff);
|
||||
|
||||
static void
|
||||
mfbZeroArcSS(pDraw, pGC, arc)
|
||||
DrawablePtr pDraw;
|
||||
GCPtr pGC;
|
||||
xArc *arc;
|
||||
{
|
||||
miZeroArcRec info;
|
||||
Bool do360;
|
||||
register int x, y, a, b, d, mask;
|
||||
register int k1, k3, dx, dy;
|
||||
PixelType *addrl;
|
||||
PixelType *yorgl, *yorgol;
|
||||
PixelType pixel;
|
||||
int nlwidth, yoffset, dyoffset;
|
||||
PixelType pmask;
|
||||
register PixelType *paddr;
|
||||
|
||||
if (((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->rop ==
|
||||
RROP_BLACK)
|
||||
pixel = 0;
|
||||
else
|
||||
pixel = ~0;
|
||||
|
||||
mfbGetPixelWidthAndPointer(pDraw, nlwidth, addrl);
|
||||
do360 = miZeroArcSetup(arc, &info, TRUE);
|
||||
yorgl = addrl + ((info.yorg + pDraw->y) * nlwidth);
|
||||
yorgol = addrl + ((info.yorgo + pDraw->y) * nlwidth);
|
||||
info.xorg += pDraw->x;
|
||||
info.xorgo += pDraw->x;
|
||||
MIARCSETUP();
|
||||
yoffset = y ? nlwidth : 0;
|
||||
dyoffset = 0;
|
||||
mask = info.initialMask;
|
||||
if (!(arc->width & 1))
|
||||
{
|
||||
DoPix(2, yorgl, 0, info.xorgo);
|
||||
DoPix(8, yorgol, 0, info.xorgo);
|
||||
}
|
||||
if (!info.end.x || !info.end.y)
|
||||
{
|
||||
mask = info.end.mask;
|
||||
info.end = info.altend;
|
||||
}
|
||||
if (do360 && (arc->width == arc->height) && !(arc->width & 1))
|
||||
{
|
||||
int xoffset = nlwidth;
|
||||
PixelType *yorghl = mfbScanlineDeltaNoBankSwitch(yorgl, info.h, nlwidth);
|
||||
int xorghp = info.xorg + info.h;
|
||||
int xorghn = info.xorg - info.h;
|
||||
|
||||
if (pixel)
|
||||
{
|
||||
while (1)
|
||||
{
|
||||
PixelateWhite(yorgl, yoffset, info.xorg + x);
|
||||
PixelateWhite(yorgl, yoffset, info.xorg - x);
|
||||
PixelateWhite(yorgol, -yoffset, info.xorg - x);
|
||||
PixelateWhite(yorgol, -yoffset, info.xorg + x);
|
||||
if (a < 0)
|
||||
break;
|
||||
PixelateWhite(yorghl, -xoffset, xorghp - y);
|
||||
PixelateWhite(yorghl, -xoffset, xorghn + y);
|
||||
PixelateWhite(yorghl, xoffset, xorghn + y);
|
||||
PixelateWhite(yorghl, xoffset, xorghp - y);
|
||||
xoffset += nlwidth;
|
||||
MIARCCIRCLESTEP(yoffset += nlwidth;);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
while (1)
|
||||
{
|
||||
PixelateBlack(yorgl, yoffset, info.xorg + x);
|
||||
PixelateBlack(yorgl, yoffset, info.xorg - x);
|
||||
PixelateBlack(yorgol, -yoffset, info.xorg - x);
|
||||
PixelateBlack(yorgol, -yoffset, info.xorg + x);
|
||||
if (a < 0)
|
||||
break;
|
||||
PixelateBlack(yorghl, -xoffset, xorghp - y);
|
||||
PixelateBlack(yorghl, -xoffset, xorghn + y);
|
||||
PixelateBlack(yorghl, xoffset, xorghn + y);
|
||||
PixelateBlack(yorghl, xoffset, xorghp - y);
|
||||
xoffset += nlwidth;
|
||||
MIARCCIRCLESTEP(yoffset += nlwidth;);
|
||||
}
|
||||
}
|
||||
x = info.w;
|
||||
yoffset = info.h * nlwidth;
|
||||
}
|
||||
else if (do360)
|
||||
{
|
||||
while (y < info.h || x < info.w)
|
||||
{
|
||||
MIARCOCTANTSHIFT(dyoffset = nlwidth;);
|
||||
Pixelate(yorgl, yoffset, info.xorg + x);
|
||||
Pixelate(yorgl, yoffset, info.xorgo - x);
|
||||
Pixelate(yorgol, -yoffset, info.xorgo - x);
|
||||
Pixelate(yorgol, -yoffset, info.xorg + x);
|
||||
MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
while (y < info.h || x < info.w)
|
||||
{
|
||||
MIARCOCTANTSHIFT(dyoffset = nlwidth;);
|
||||
if ((x == info.start.x) || (y == info.start.y))
|
||||
{
|
||||
mask = info.start.mask;
|
||||
info.start = info.altstart;
|
||||
}
|
||||
DoPix(1, yorgl, yoffset, info.xorg + x);
|
||||
DoPix(2, yorgl, yoffset, info.xorgo - x);
|
||||
DoPix(4, yorgol, -yoffset, info.xorgo - x);
|
||||
DoPix(8, yorgol, -yoffset, info.xorg + x);
|
||||
if ((x == info.end.x) || (y == info.end.y))
|
||||
{
|
||||
mask = info.end.mask;
|
||||
info.end = info.altend;
|
||||
}
|
||||
MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
|
||||
}
|
||||
}
|
||||
if ((x == info.start.x) || (y == info.start.y))
|
||||
mask = info.start.mask;
|
||||
DoPix(1, yorgl, yoffset, info.xorg + x);
|
||||
DoPix(4, yorgol, -yoffset, info.xorgo - x);
|
||||
if (arc->height & 1)
|
||||
{
|
||||
DoPix(2, yorgl, yoffset, info.xorgo - x);
|
||||
DoPix(8, yorgol, -yoffset, info.xorg + x);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
mfbZeroPolyArcSS(pDraw, pGC, narcs, parcs)
|
||||
DrawablePtr pDraw;
|
||||
GCPtr pGC;
|
||||
int narcs;
|
||||
xArc *parcs;
|
||||
{
|
||||
register xArc *arc;
|
||||
register int i;
|
||||
BoxRec box;
|
||||
int x2, y2;
|
||||
RegionPtr cclip;
|
||||
|
||||
if (!pGC->planemask & 1)
|
||||
return;
|
||||
cclip = ((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->pCompositeClip;
|
||||
for (arc = parcs, i = narcs; --i >= 0; arc++)
|
||||
{
|
||||
if (miCanZeroArc(arc))
|
||||
{
|
||||
box.x1 = arc->x + pDraw->x;
|
||||
box.y1 = arc->y + pDraw->y;
|
||||
/*
|
||||
* Because box.x2 and box.y2 get truncated to 16 bits, and the
|
||||
* RECT_IN_REGION test treats the resulting number as a signed
|
||||
* integer, the RECT_IN_REGION test alone can go the wrong way.
|
||||
* This can result in a server crash because the rendering
|
||||
* routines in this file deal directly with cpu addresses
|
||||
* of pixels to be stored, and do not clip or otherwise check
|
||||
* that all such addresses are within their respective pixmaps.
|
||||
* So we only allow the RECT_IN_REGION test to be used for
|
||||
* values that can be expressed correctly in a signed short.
|
||||
*/
|
||||
x2 = box.x1 + (int)arc->width + 1;
|
||||
box.x2 = x2;
|
||||
y2 = box.y1 + (int)arc->height + 1;
|
||||
box.y2 = y2;
|
||||
if ( (x2 <= MAXSHORT) && (y2 <= MAXSHORT) &&
|
||||
(RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN) )
|
||||
mfbZeroArcSS(pDraw, pGC, arc);
|
||||
else
|
||||
miZeroPolyArc(pDraw, pGC, 1, arc);
|
||||
}
|
||||
else
|
||||
miPolyArc(pDraw, pGC, 1, arc);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user