/* $XFree86: xc/programs/Xserver/cfb/cfbzerarc.c,v 3.2 2001/01/17 22:36:37 dawes Exp $ */ /************************************************************ Copyright 1989, 1998 The Open Group All Rights Reserved. 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: cfbzerarc.c,v 1.3 2000/08/17 19:48:15 cpqbld 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 "cfb.h" #include "cfbmskbits.h" #include "mizerarc.h" #include "cfbrrop.h" #include "mi.h" #ifdef PIXEL_ADDR static void RROP_NAME(cfbZeroArcSS8) (pDraw, pGC, arc) DrawablePtr pDraw; GCPtr pGC; xArc *arc; { miZeroArcRec info; Bool do360; register int x; PixelType *addrp; register PixelType *yorgp, *yorgop; #if PSZ == 24 int xorg, xorg3, xorgo, xorgo3; register int xtmp; #endif RROP_DECLARE register int yoffset; int npwidth, dyoffset; register int y, a, b, d, mask; register int k1, k3, dx, dy; cfbGetPixelWidthAndPointer(pDraw,npwidth, addrp) RROP_FETCH_GC (pGC); do360 = miZeroArcSetup(arc, &info, TRUE); yorgp = addrp + ((info.yorg + pDraw->y) * npwidth); yorgop = addrp + ((info.yorgo + pDraw->y) * npwidth); info.xorg += pDraw->x; info.xorgo += pDraw->x; #if PSZ == 24 xorg = info.xorg; xorg3 = xorg * 3; info.xorg = (info.xorg * 3) >> 2; xorgo = info.xorgo; xorgo3 = xorgo * 3; info.xorgo = (info.xorgo * 3) >> 2; #endif MIARCSETUP(); yoffset = y ? npwidth : 0; dyoffset = 0; mask = info.initialMask; if (!(arc->width & 1)) { #if PSZ == 24 if (mask & 2) RROP_SOLID24((yorgp + info.xorgo), xorgo); if (mask & 8) RROP_SOLID24((yorgop + info.xorgo), xorgo); #else if (mask & 2) RROP_SOLID((yorgp + info.xorgo)); if (mask & 8) RROP_SOLID((yorgop + info.xorgo)); #endif /* PSZ == 24 */ } if (!info.end.x || !info.end.y) { mask = info.end.mask; info.end = info.altend; } if (do360 && (arc->width == arc->height) && !(arc->width & 1)) { register int xoffset = npwidth; #if PSZ == 24 PixelType *yorghb = yorgp + (info.h * npwidth); register int tmp1, tmp2, tmp1_3, tmp2_3; tmp1 = xorg + info.h; tmp1_3 = tmp1 * 3; tmp2 = xorg - info.h; tmp2_3 = tmp2 * 3; while (1) { xtmp = (xorg3 + x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorg + x); RROP_SOLID24(yorgop - yoffset + xtmp, xorg + x); xtmp = (xorg3 - x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorg - x); RROP_SOLID24(yorgop - yoffset + xtmp, xorg - x); if (a < 0) break; xtmp = (tmp1_3 - y * 3) >> 2; RROP_SOLID24(yorghb - xoffset + xtmp, tmp1 - y); RROP_SOLID24(yorghb + xoffset + xtmp, tmp1 - y); xtmp = (tmp2_3 + y * 3) >> 2; RROP_SOLID24(yorghb - xoffset + xtmp, tmp2 + y); RROP_SOLID24(yorghb + xoffset + xtmp, tmp2 + y); xoffset += npwidth; MIARCCIRCLESTEP(yoffset += npwidth;); } #else PixelType *yorghb = yorgp + (info.h * npwidth) + info.xorg; PixelType *yorgohb = yorghb - info.h; yorgp += info.xorg; yorgop += info.xorg; yorghb += info.h; while (1) { RROP_SOLID(yorgp + yoffset + x); RROP_SOLID(yorgp + yoffset - x); RROP_SOLID(yorgop - yoffset - x); RROP_SOLID(yorgop - yoffset + x); if (a < 0) break; RROP_SOLID(yorghb - xoffset - y); RROP_SOLID(yorgohb - xoffset + y); RROP_SOLID(yorgohb + xoffset + y); RROP_SOLID(yorghb + xoffset - y); xoffset += npwidth; MIARCCIRCLESTEP(yoffset += npwidth;); } yorgp -= info.xorg; yorgop -= info.xorg; #endif /* PSZ == 24 */ x = info.w; yoffset = info.h * npwidth; } else if (do360) { while (y < info.h || x < info.w) { MIARCOCTANTSHIFT(dyoffset = npwidth;); #if PSZ == 24 xtmp = (xorg3 + x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorg + x); RROP_SOLID24(yorgop - yoffset + xtmp, xorg + x); xtmp = (xorgo3 - x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorgo - x); RROP_SOLID24(yorgop - yoffset + xtmp, xorgo - x); #else RROP_SOLID(yorgp + yoffset + info.xorg + x); RROP_SOLID(yorgp + yoffset + info.xorgo - x); RROP_SOLID(yorgop - yoffset + info.xorgo - x); RROP_SOLID(yorgop - yoffset + info.xorg + x); #endif MIARCSTEP(yoffset += dyoffset;, yoffset += npwidth;); } } else { while (y < info.h || x < info.w) { MIARCOCTANTSHIFT(dyoffset = npwidth;); if ((x == info.start.x) || (y == info.start.y)) { mask = info.start.mask; info.start = info.altstart; } #if PSZ == 24 if (mask & 1){ xtmp = (xorg3 + x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorg + x); } if (mask & 2){ xtmp = (xorgo3 - x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorgo - x); } if (mask & 4){ xtmp = (xorgo3 - x * 3) >> 2; RROP_SOLID24(yorgop - yoffset + xtmp, xorgo - x); } if (mask & 8){ xtmp = (xorg3 + x * 3) >> 2; RROP_SOLID24(yorgop - yoffset + xtmp, xorg + x); } #else if (mask & 1) RROP_SOLID(yorgp + yoffset + info.xorg + x); if (mask & 2) RROP_SOLID(yorgp + yoffset + info.xorgo - x); if (mask & 4) RROP_SOLID(yorgop - yoffset + info.xorgo - x); if (mask & 8) RROP_SOLID(yorgop - yoffset + info.xorg + x); #endif /* PSZ == 24 */ if ((x == info.end.x) || (y == info.end.y)) { mask = info.end.mask; info.end = info.altend; } MIARCSTEP(yoffset += dyoffset;, yoffset += npwidth;); } } if ((x == info.start.x) || (y == info.start.y)) mask = info.start.mask; #if PSZ == 24 if (mask & 1){ xtmp = (xorg3 + x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorg + x); } if (mask & 4){ xtmp = (xorgo3 - x * 3) >> 2; RROP_SOLID24(yorgop - yoffset + xtmp, xorgo - x); } #else if (mask & 1) RROP_SOLID(yorgp + yoffset + info.xorg + x); if (mask & 4) RROP_SOLID(yorgop - yoffset + info.xorgo - x); #endif /* PSZ == 24 */ if (arc->height & 1) { #if PSZ == 24 if (mask & 2){ xtmp = (xorgo3 - x * 3) >> 2; RROP_SOLID24(yorgp + yoffset + xtmp, xorgo - x); } if (mask & 8){ xtmp = (xorg3 + x * 3) >> 2; RROP_SOLID24(yorgop - yoffset + xtmp, xorg + x); } #else if (mask & 2) RROP_SOLID(yorgp + yoffset + info.xorgo - x); if (mask & 8) RROP_SOLID(yorgop - yoffset + info.xorg + x); #endif /* PSZ == 24 */ } } void RROP_NAME (cfbZeroPolyArcSS8) (pDraw, pGC, narcs, parcs) register DrawablePtr pDraw; GCPtr pGC; int narcs; xArc *parcs; { register xArc *arc; register int i; BoxRec box; int x2, y2; RegionPtr cclip; cclip = cfbGetCompositeClip(pGC); 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) ) RROP_NAME (cfbZeroArcSS8) (pDraw, pGC, arc); else miZeroPolyArc(pDraw, pGC, 1, arc); } else miPolyArc(pDraw, pGC, 1, arc); } } #endif