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sync code with last improvements from OpenBSD

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purplerain 2023-08-28 05:57:34 +00:00
commit 88965415ff
Signed by: purplerain
GPG key ID: F42C07F07E2E35B7
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xserver/fb/fbarc.c Normal file
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/*
* Copyright © 1998 Keith Packard
*
* 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, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "fb.h"
#include "mizerarc.h"
#include <limits.h>
typedef void (*FbArc) (FbBits * dst,
FbStride dstStride,
int dstBpp,
xArc * arc, int dx, int dy, FbBits and, FbBits xor);
void
fbPolyArc(DrawablePtr pDrawable, GCPtr pGC, int narcs, xArc * parcs)
{
FbArc arc;
if (pGC->lineWidth == 0) {
arc = 0;
if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid) {
switch (pDrawable->bitsPerPixel) {
case 8:
arc = fbArc8;
break;
case 16:
arc = fbArc16;
break;
case 32:
arc = fbArc32;
break;
}
}
if (arc) {
FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
FbBits *dst;
FbStride dstStride;
int dstBpp;
int dstXoff, dstYoff;
BoxRec box;
int x2, y2;
RegionPtr cclip;
#ifdef FB_ACCESS_WRAPPER
int wrapped = 1;
#endif
cclip = fbGetCompositeClip(pGC);
fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
while (narcs--) {
if (miCanZeroArc(parcs)) {
box.x1 = parcs->x + pDrawable->x;
box.y1 = parcs->y + pDrawable->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) parcs->width + 1;
box.x2 = x2;
y2 = box.y1 + (int) parcs->height + 1;
box.y2 = y2;
if ((x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
(RegionContainsRect(cclip, &box) == rgnIN)) {
#ifdef FB_ACCESS_WRAPPER
if (!wrapped) {
fbPrepareAccess(pDrawable);
wrapped = 1;
}
#endif
(*arc) (dst, dstStride, dstBpp,
parcs, pDrawable->x + dstXoff,
pDrawable->y + dstYoff, pPriv->and, pPriv->xor);
}
else {
#ifdef FB_ACCESS_WRAPPER
if (wrapped) {
fbFinishAccess(pDrawable);
wrapped = 0;
}
#endif
miZeroPolyArc(pDrawable, pGC, 1, parcs);
}
}
else {
#ifdef FB_ACCESS_WRAPPER
if (wrapped) {
fbFinishAccess(pDrawable);
wrapped = 0;
}
#endif
miPolyArc(pDrawable, pGC, 1, parcs);
}
parcs++;
}
#ifdef FB_ACCESS_WRAPPER
if (wrapped) {
fbFinishAccess(pDrawable);
wrapped = 0;
}
#endif
}
else
miZeroPolyArc(pDrawable, pGC, narcs, parcs);
}
else
miPolyArc(pDrawable, pGC, narcs, parcs);
}