259 lines
7.7 KiB
C
259 lines
7.7 KiB
C
/* $XFree86: xc/programs/Xserver/mfb/mfbzerarc.c,v 3.7 2002/09/27 01:57:47 dawes Exp $ */
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/************************************************************
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Copyright 1989, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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********************************************************/
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/* $Xorg: mfbzerarc.c,v 1.4 2001/02/09 02:05:19 xorgcvs Exp $ */
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/* Derived from:
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* "Algorithm for drawing ellipses or hyperbolae with a digital plotter"
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* by M. L. V. Pitteway
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* The Computer Journal, November 1967, Volume 10, Number 3, pp. 282-289
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xprotostr.h>
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#include "regionstr.h"
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#include "gcstruct.h"
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#include "pixmapstr.h"
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#include "scrnintstr.h"
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#include "mfb.h"
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#include "maskbits.h"
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#include "mizerarc.h"
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#include "mi.h"
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/*
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* Note: LEFTMOST must be the bit leftmost in the actual screen
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* representation. This depends also on the IMAGE_BYTE_ORDER.
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* LONG2CHARS() takes care of the re-ordering as required. (DHD)
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*/
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#if (BITMAP_BIT_ORDER == MSBFirst)
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#define LEFTMOST ((PixelType) LONG2CHARS(((MfbBits)1 << PLST)))
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#else
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#define LEFTMOST ((PixelType) LONG2CHARS(1))
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#endif
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#define PixelateWhite(addr,yoff,xoff) \
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*mfbScanlineOffset(addr, (yoff)+((xoff)>>PWSH)) |= \
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SCRRIGHT (LEFTMOST, ((xoff) & PIM))
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#define PixelateBlack(addr,yoff,xoff) \
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*mfbScanlineOffset(addr, (yoff)+((xoff)>>PWSH)) &= \
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~(SCRRIGHT (LEFTMOST, ((xoff) & PIM)))
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#define Pixelate(base,yoff,xoff) \
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{ \
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paddr = mfbScanlineOffset(base, (yoff) + ((xoff)>>PWSH)); \
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pmask = SCRRIGHT(LEFTMOST, (xoff) & PIM); \
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*paddr = (*paddr & ~pmask) | (pixel & pmask); \
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}
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#define DoPix(bit,base,yoff,xoff) if (mask & bit) Pixelate(base,yoff,xoff);
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static void
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mfbZeroArcSS(
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DrawablePtr pDraw,
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GCPtr pGC,
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xArc *arc)
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{
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miZeroArcRec info;
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Bool do360;
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register int x, y, a, b, d, mask;
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register int k1, k3, dx, dy;
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PixelType *addrl;
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PixelType *yorgl, *yorgol;
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PixelType pixel;
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int nlwidth, yoffset, dyoffset;
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PixelType pmask;
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register PixelType *paddr;
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if (((mfbPrivGC *)(pGC->devPrivates[mfbGCPrivateIndex].ptr))->rop ==
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RROP_BLACK)
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pixel = 0;
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else
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pixel = ~0;
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mfbGetPixelWidthAndPointer(pDraw, nlwidth, addrl);
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do360 = miZeroArcSetup(arc, &info, TRUE);
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yorgl = addrl + ((info.yorg + pDraw->y) * nlwidth);
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yorgol = addrl + ((info.yorgo + pDraw->y) * nlwidth);
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info.xorg += pDraw->x;
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info.xorgo += pDraw->x;
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MIARCSETUP();
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yoffset = y ? nlwidth : 0;
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dyoffset = 0;
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mask = info.initialMask;
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if (!(arc->width & 1))
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{
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DoPix(2, yorgl, 0, info.xorgo);
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DoPix(8, yorgol, 0, info.xorgo);
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}
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if (!info.end.x || !info.end.y)
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{
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mask = info.end.mask;
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info.end = info.altend;
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}
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if (do360 && (arc->width == arc->height) && !(arc->width & 1))
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{
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int xoffset = nlwidth;
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PixelType *yorghl = mfbScanlineDeltaNoBankSwitch(yorgl, info.h, nlwidth);
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int xorghp = info.xorg + info.h;
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int xorghn = info.xorg - info.h;
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if (pixel)
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{
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while (1)
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{
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PixelateWhite(yorgl, yoffset, info.xorg + x);
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PixelateWhite(yorgl, yoffset, info.xorg - x);
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PixelateWhite(yorgol, -yoffset, info.xorg - x);
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PixelateWhite(yorgol, -yoffset, info.xorg + x);
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if (a < 0)
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break;
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PixelateWhite(yorghl, -xoffset, xorghp - y);
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PixelateWhite(yorghl, -xoffset, xorghn + y);
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PixelateWhite(yorghl, xoffset, xorghn + y);
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PixelateWhite(yorghl, xoffset, xorghp - y);
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xoffset += nlwidth;
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MIARCCIRCLESTEP(yoffset += nlwidth;);
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}
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}
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else
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{
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while (1)
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{
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PixelateBlack(yorgl, yoffset, info.xorg + x);
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PixelateBlack(yorgl, yoffset, info.xorg - x);
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PixelateBlack(yorgol, -yoffset, info.xorg - x);
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PixelateBlack(yorgol, -yoffset, info.xorg + x);
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if (a < 0)
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break;
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PixelateBlack(yorghl, -xoffset, xorghp - y);
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PixelateBlack(yorghl, -xoffset, xorghn + y);
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PixelateBlack(yorghl, xoffset, xorghn + y);
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PixelateBlack(yorghl, xoffset, xorghp - y);
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xoffset += nlwidth;
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MIARCCIRCLESTEP(yoffset += nlwidth;);
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}
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}
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x = info.w;
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yoffset = info.h * nlwidth;
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}
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else if (do360)
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{
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while (y < info.h || x < info.w)
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{
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MIARCOCTANTSHIFT(dyoffset = nlwidth;);
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Pixelate(yorgl, yoffset, info.xorg + x);
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Pixelate(yorgl, yoffset, info.xorgo - x);
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Pixelate(yorgol, -yoffset, info.xorgo - x);
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Pixelate(yorgol, -yoffset, info.xorg + x);
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MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
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}
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}
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else
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{
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while (y < info.h || x < info.w)
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{
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MIARCOCTANTSHIFT(dyoffset = nlwidth;);
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if ((x == info.start.x) || (y == info.start.y))
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{
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mask = info.start.mask;
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info.start = info.altstart;
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}
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DoPix(1, yorgl, yoffset, info.xorg + x);
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DoPix(2, yorgl, yoffset, info.xorgo - x);
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DoPix(4, yorgol, -yoffset, info.xorgo - x);
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DoPix(8, yorgol, -yoffset, info.xorg + x);
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if ((x == info.end.x) || (y == info.end.y))
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{
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mask = info.end.mask;
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info.end = info.altend;
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}
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MIARCSTEP(yoffset += dyoffset;, yoffset += nlwidth;);
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}
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}
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if ((x == info.start.x) || (y == info.start.y))
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mask = info.start.mask;
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DoPix(1, yorgl, yoffset, info.xorg + x);
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DoPix(4, yorgol, -yoffset, info.xorgo - x);
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if (arc->height & 1)
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{
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DoPix(2, yorgl, yoffset, info.xorgo - x);
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DoPix(8, yorgol, -yoffset, info.xorg + x);
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}
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}
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void
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mfbZeroPolyArcSS(pDraw, pGC, narcs, parcs)
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DrawablePtr pDraw;
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GCPtr pGC;
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int narcs;
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xArc *parcs;
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{
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register xArc *arc;
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register int i;
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BoxRec box;
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int x2, y2;
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RegionPtr cclip;
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if (!(pGC->planemask & 1))
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return;
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cclip = pGC->pCompositeClip;
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for (arc = parcs, i = narcs; --i >= 0; arc++)
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{
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if (miCanZeroArc(arc))
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{
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box.x1 = arc->x + pDraw->x;
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box.y1 = arc->y + pDraw->y;
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/*
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* Because box.x2 and box.y2 get truncated to 16 bits, and the
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* RECT_IN_REGION test treats the resulting number as a signed
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* integer, the RECT_IN_REGION test alone can go the wrong way.
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* This can result in a server crash because the rendering
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* routines in this file deal directly with cpu addresses
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* of pixels to be stored, and do not clip or otherwise check
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* that all such addresses are within their respective pixmaps.
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* So we only allow the RECT_IN_REGION test to be used for
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* values that can be expressed correctly in a signed short.
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*/
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x2 = box.x1 + (int)arc->width + 1;
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box.x2 = x2;
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y2 = box.y1 + (int)arc->height + 1;
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box.y2 = y2;
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if ( (x2 <= MAXSHORT) && (y2 <= MAXSHORT) &&
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(RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN) )
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mfbZeroArcSS(pDraw, pGC, arc);
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else
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miZeroPolyArc(pDraw, pGC, 1, arc);
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}
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else
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miPolyArc(pDraw, pGC, 1, arc);
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}
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}
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