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-rw-r--r--cfb/cfbzerarc.c322
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diff --git a/cfb/cfbzerarc.c b/cfb/cfbzerarc.c
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-/************************************************************
-
-Copyright 1989, 1998 The Open Group
-
-Permission to use, copy, modify, distribute, and sell this software and its
-documentation for any purpose is hereby granted without fee, provided that
-the above copyright notice appear in all copies and that both that
-copyright notice and this permission notice appear in supporting
-documentation.
-
-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.
-
-********************************************************/
-
-
-/* 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
- */
-
-#ifdef HAVE_DIX_CONFIG_H
-#include <dix-config.h>
-#endif
-
-#include <limits.h>
-
-#include <X11/X.h>
-#include <X11/Xprotostr.h>
-#include "regionstr.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)(
- 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 */
- }
- RROP_UNDECLARE
-}
-
-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 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
- (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
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