[deb_xorg-server.git] / fb / fbarc.c

/*
 * 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 24:
                arc = fbArc24;
                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);
}
Commit	Line	Data
a09e091a JB	1	/*
	2	* Copyright © 1998 Keith Packard
	3	*
	4	* Permission to use, copy, modify, distribute, and sell this software and its
	5	* documentation for any purpose is hereby granted without fee, provided that
	6	* the above copyright notice appear in all copies and that both that
	7	* copyright notice and this permission notice appear in supporting
	8	* documentation, and that the name of Keith Packard not be used in
	9	* advertising or publicity pertaining to distribution of the software without
	10	* specific, written prior permission. Keith Packard makes no
	11	* representations about the suitability of this software for any purpose. It
	12	* is provided "as is" without express or implied warranty.
	13	*
	14	* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	15	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	16	* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	17	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	18	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	19	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	20	* PERFORMANCE OF THIS SOFTWARE.
	21	*/
	22
	23	#ifdef HAVE_DIX_CONFIG_H
	24	#include <dix-config.h>
	25	#endif
	26
	27	#include "fb.h"
	28	#include "mizerarc.h"
	29	#include <limits.h>
	30
	31	typedef void (FbArc) (FbBits dst,
	32	FbStride dstStride,
	33	int dstBpp,
	34	xArc * arc, int dx, int dy, FbBits and, FbBits xor);
	35
	36	void
	37	fbPolyArc(DrawablePtr pDrawable, GCPtr pGC, int narcs, xArc * parcs)
	38	{
	39	FbArc arc;
	40
	41	if (pGC->lineWidth == 0) {
	42	arc = 0;
	43	if (pGC->lineStyle == LineSolid && pGC->fillStyle == FillSolid) {
	44	switch (pDrawable->bitsPerPixel) {
	45	case 8:
	46	arc = fbArc8;
	47	break;
	48	case 16:
	49	arc = fbArc16;
	50	break;
	51	case 24:
	52	arc = fbArc24;
	53	break;
	54	case 32:
	55	arc = fbArc32;
	56	break;
	57	}
	58	}
	59	if (arc) {
	60	FbGCPrivPtr pPriv = fbGetGCPrivate(pGC);
	61	FbBits *dst;
	62	FbStride dstStride;
	63	int dstBpp;
	64	int dstXoff, dstYoff;
65	BoxRec box;
66	int x2, y2;
67	RegionPtr cclip;
68
69	#ifdef FB_ACCESS_WRAPPER
70	int wrapped = 1;
71	#endif
72
73	cclip = fbGetCompositeClip(pGC);
74	fbGetDrawable(pDrawable, dst, dstStride, dstBpp, dstXoff, dstYoff);
75	while (narcs--) {
76	if (miCanZeroArc(parcs)) {
77	box.x1 = parcs->x + pDrawable->x;
78	box.y1 = parcs->y + pDrawable->y;
79	/*
80	* Because box.x2 and box.y2 get truncated to 16 bits, and the
81	* RECT_IN_REGION test treats the resulting number as a signed
82	* integer, the RECT_IN_REGION test alone can go the wrong way.
83	* This can result in a server crash because the rendering
84	* routines in this file deal directly with cpu addresses
85	* of pixels to be stored, and do not clip or otherwise check
86	* that all such addresses are within their respective pixmaps.
87	* So we only allow the RECT_IN_REGION test to be used for
88	* values that can be expressed correctly in a signed short.
89	*/
90	x2 = box.x1 + (int) parcs->width + 1;
91	box.x2 = x2;
92	y2 = box.y1 + (int) parcs->height + 1;
93	box.y2 = y2;
94	if ((x2 <= SHRT_MAX) && (y2 <= SHRT_MAX) &&
95	(RegionContainsRect(cclip, &box) == rgnIN)) {
96	#ifdef FB_ACCESS_WRAPPER
97	if (!wrapped) {
98	fbPrepareAccess(pDrawable);
99	wrapped = 1;
100	}
101	#endif
102	(*arc) (dst, dstStride, dstBpp,
103	parcs, pDrawable->x + dstXoff,
104	pDrawable->y + dstYoff, pPriv->and, pPriv->xor);
105	}
106	else {
107	#ifdef FB_ACCESS_WRAPPER
108	if (wrapped) {
109	fbFinishAccess(pDrawable);
110	wrapped = 0;
111	}
112	#endif
113	miZeroPolyArc(pDrawable, pGC, 1, parcs);
114	}
115	}
116	else {
117	#ifdef FB_ACCESS_WRAPPER
118	if (wrapped) {
119	fbFinishAccess(pDrawable);
120	wrapped = 0;
121	}
122	#endif
123	miPolyArc(pDrawable, pGC, 1, parcs);
124	}
125	parcs++;
126	}
127	#ifdef FB_ACCESS_WRAPPER
128	if (wrapped) {
129	fbFinishAccess(pDrawable);
130	wrapped = 0;
131	}
132	#endif
133	}
134	else
135	miZeroPolyArc(pDrawable, pGC, narcs, parcs);
136	}
137	else
138	miPolyArc(pDrawable, pGC, narcs, parcs);
139	}