/* $XFree86: xc/programs/Xserver/afb/afbzerarc.c,v 3.0 1996/08/18 01:45:59 dawes 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: afbzerarc.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 */ #include "X.h" #include "Xprotostr.h" #include "miscstruct.h" #include "gcstruct.h" #include "pixmapstr.h" #include "scrnintstr.h" #include "afb.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 = afbScanlineOffset(base, (yoff) + ((xoff)>>PWSH)); \ pmask = SCRRIGHT(LEFTMOST, (xoff) & PIM); \ for (de = 0; de < depthDst; de++, paddr += sizeDst) /* @@@ 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 afbZeroArcSS(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 sizeDst, depthDst; PixelType pmask; register PixelType *paddr; register unsigned char *rrops; rrops = ((afbPrivGC *)(pGC->devPrivates[afbGCPrivateIndex].ptr))->rrops; afbGetPixelWidthSizeDepthAndPointer(pDraw, nlwidth, sizeDst, depthDst, 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 = afbScanlineDeltaNoBankSwitch(yorgl, info.h, nlwidth); 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 += 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 afbZeroPolyArcSS(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) afbZeroArcSS(pDraw, pGC, arc); else miZeroPolyArc(pDraw, pGC, 1, arc); } else miPolyArc(pDraw, pGC, 1, arc); } }