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Diffstat (limited to 'ilbm/ilbmzerarc.c')
| -rw-r--r-- | ilbm/ilbmzerarc.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/ilbm/ilbmzerarc.c b/ilbm/ilbmzerarc.c new file mode 100644 index 000000000..9bdf22155 --- /dev/null +++ b/ilbm/ilbmzerarc.c @@ -0,0 +1,210 @@ +/* $XFree86: xc/programs/Xserver/ilbm/ilbmzerarc.c,v 3.1 1998/03/20 21:08:04 hohndel Exp $ */ +/************************************************************ + +Copyright (c) 1989 X Consortium + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +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 +X CONSORTIUM 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 X Consortium 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 X Consortium. + +********************************************************/ + +/* $XConsortium: ilbmzerarc.c,v 5.19 94/04/17 20:28:37 dpw 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 + */ + +/* Modified jun 95 by Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be) + to use interleaved bitplanes instead of normal bitplanes */ + +#include "X.h" +#include "Xprotostr.h" +#include "miscstruct.h" +#include "gcstruct.h" +#include "pixmapstr.h" +#include "scrnintstr.h" +#include "ilbm.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 Pixelate(base,yoff,xoff) \ +{ \ + paddr = ilbmScanlineOffset(base, (yoff) + ((xoff)>>PWSH)); \ + pmask = SCRRIGHT(LEFTMOST, (xoff) & PIM); \ + for (de = 0; de < depthDst; de++, paddr += nlwidth) /* @@@ NEXT PLANE @@@ */ \ + switch (rrops[de]) { \ + case RROP_BLACK: \ + *paddr &= ~pmask; \ + break; \ + case RROP_WHITE: \ + *paddr |= pmask; \ + break; \ + case RROP_INVERT: \ + *paddr ^= pmask; \ + break; \ + case RROP_NOP: \ + break; \ + } \ +} + +#define DoPix(bit,base,yoff,xoff) if (mask & bit) Pixelate(base,yoff,xoff); + +static void +ilbmZeroArcSS(pDraw, pGC, arc) + DrawablePtr pDraw; + GCPtr pGC; + xArc *arc; +{ + miZeroArcRec info; + Bool do360; + register int de; + 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; + int auxDst, depthDst; + PixelType pmask; + register PixelType *paddr; + register unsigned char *rrops; + + rrops = ((ilbmPrivGC *)(pGC->devPrivates[ilbmGCPrivateIndex].ptr))->rrops; + + ilbmGetPixelWidthAuxDepthAndPointer(pDraw, nlwidth, auxDst, depthDst, + addrl); + do360 = miZeroArcSetup(arc, &info, TRUE); + yorgl = addrl + ((info.yorg + pDraw->y) * auxDst); + yorgol = addrl + ((info.yorgo + pDraw->y) * auxDst); + info.xorg += pDraw->x; + info.xorgo += pDraw->x; + MIARCSETUP(); + yoffset = y ? auxDst : 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 = auxDst; + PixelType *yorghl = ilbmScanlineDeltaNoBankSwitch(yorgl, info.h, auxDst); + int xorghp = info.xorg + info.h; + int xorghn = info.xorg - info.h; + + while (1) { + Pixelate(yorgl, yoffset, info.xorg + x); + Pixelate(yorgl, yoffset, info.xorg - x); + Pixelate(yorgol, -yoffset, info.xorg - x); + Pixelate(yorgol, -yoffset, info.xorg + x); + if (a < 0) + break; + Pixelate(yorghl, -xoffset, xorghp - y); + Pixelate(yorghl, -xoffset, xorghn + y); + Pixelate(yorghl, xoffset, xorghn + y); + Pixelate(yorghl, xoffset, xorghp - y); + xoffset += auxDst; + MIARCCIRCLESTEP(yoffset += auxDst;); + } + x = info.w; + yoffset = info.h * auxDst; + } else if (do360) { + while (y < info.h || x < info.w) { + MIARCOCTANTSHIFT(dyoffset = auxDst;); + 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 += auxDst;); + } + } else { + while (y < info.h || x < info.w) { + MIARCOCTANTSHIFT(dyoffset = auxDst;); + 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 += auxDst;); + } + } + 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 +ilbmZeroPolyArcSS(pDraw, pGC, narcs, parcs) + DrawablePtr pDraw; + GCPtr pGC; + int narcs; + xArc *parcs; +{ + register xArc *arc; + register int i; + BoxRec box; + RegionPtr cclip; + + cclip = pGC->pCompositeClip; + for (arc = parcs, i = narcs; --i >= 0; arc++) { + if (miCanZeroArc(arc)) { + box.x1 = arc->x + pDraw->x; + box.y1 = arc->y + pDraw->y; + box.x2 = box.x1 + (int)arc->width + 1; + box.y2 = box.y1 + (int)arc->height + 1; + if (RECT_IN_REGION(pDraw->pScreen, cclip, &box) == rgnIN) + ilbmZeroArcSS(pDraw, pGC, arc); + else + miZeroPolyArc(pDraw, pGC, 1, arc); + } else + miPolyArc(pDraw, pGC, 1, arc); + } +} |