4017d31902
over to new system. Need to update documentation and address some remaining vestiges of old system such as CursorRec structure, fb "offman" structure, and FontRec privates.
260 lines
7.6 KiB
C
260 lines
7.6 KiB
C
/************************************************************
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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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/* 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 <limits.h>
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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 *)dixLookupPrivate(&pGC->devPrivates,
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mfbGetGCPrivateKey()))->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 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
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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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