gtk/gdk/linux-fb/midash.c
Matthias Clasen 6de551b504 Fix many sparse warnings. (#157253, Kjartan Maraas.
2004-11-10  Matthias Clasen  <mclasen@redhat.com>

	* gdk/linux-fb/*: Fix many sparse warnings.  (#157253,
	Kjartan Maraas.
2004-11-10 13:30:55 +00:00

311 lines
7.3 KiB
C

/***********************************************************
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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.
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************/
/* $TOG: midash.c /main/14 1998/02/09 14:46:34 kaleb $ */
#include <config.h>
#include "mi.h"
static miDashPtr
CheckDashStorage(miDashPtr *ppseg, int nseg, int *pnsegMax);
/* return a list of DashRec. there will be an extra
entry at the end holding the last point of the polyline.
this means that the code that actually draws dashes can
get a pair of points for every dash. only the point in the last
dash record is useful; the other fields are not used.
nseg is the number of segments, not the number of points.
example:
dash1.start
dash2.start
dash3.start
last-point
defines a list of segments
(dash1.pt, dash2.pt)
(dash2.pt, dash3.pt)
(dash3.pt, last-point)
and nseg == 3.
NOTE:
EVEN_DASH == ~ODD_DASH
NOTE ALSO:
miDashLines may return 0 segments, going from pt[0] to pt[0] with one dash.
*/
enum { EVEN_DASH=0, ODD_DASH=1 };
#define sign(x) ((x)>0)?1:( ((x)<0)?-1:0 )
miDashPtr
miDashLine(int npt, GdkPoint *ppt, unsigned int nDash,
unsigned char *pDash, unsigned int offset, int *pnseg)
{
GdkPoint pt1, pt2;
int lenCur; /* npt used from this dash */
int lenMax; /* npt in this dash */
int iDash = 0; /* index of current dash */
int which; /* EVEN_DASH or ODD_DASH */
miDashPtr pseg; /* list of dash segments */
miDashPtr psegBase; /* start of list */
int nseg = 0; /* number of dashes so far */
int nsegMax = 0; /* num segs we can fit in this list */
int x, y, len;
int adx, ady, signdx, signdy;
int du, dv, e1, e2, e, base_e = 0;
lenCur = offset;
which = EVEN_DASH;
while(lenCur >= pDash[iDash])
{
lenCur -= pDash[iDash];
iDash++;
if (iDash >= nDash)
iDash = 0;
which = ~which;
}
lenMax = pDash[iDash];
psegBase = (miDashPtr)NULL;
pt2 = ppt[0]; /* just in case there is only one point */
while(--npt)
{
if (PtEqual(ppt[0], ppt[1]))
{
ppt++;
continue; /* no duplicated points in polyline */
}
pt1 = *ppt++;
pt2 = *ppt;
adx = pt2.x - pt1.x;
ady = pt2.y - pt1.y;
signdx = sign(adx);
signdy = sign(ady);
adx = abs(adx);
ady = abs(ady);
if (adx > ady)
{
du = adx;
dv = ady;
len = adx;
}
else
{
du = ady;
dv = adx;
len = ady;
}
e1 = dv * 2;
e2 = e1 - 2*du;
e = e1 - du;
x = pt1.x;
y = pt1.y;
nseg++;
pseg = CheckDashStorage(&psegBase, nseg, &nsegMax);
if (!pseg)
return (miDashPtr)NULL;
pseg->pt = pt1;
pseg->e1 = e1;
pseg->e2 = e2;
base_e = pseg->e = e;
pseg->which = which;
pseg->newLine = 1;
while (len--)
{
if (adx > ady)
{
/* X_AXIS */
if (((signdx > 0) && (e < 0)) ||
((signdx <=0) && (e <=0))
)
{
e += e1;
}
else
{
y += signdy;
e += e2;
}
x += signdx;
}
else
{
/* Y_AXIS */
if (((signdx > 0) && (e < 0)) ||
((signdx <=0) && (e <=0))
)
{
e +=e1;
}
else
{
x += signdx;
e += e2;
}
y += signdy;
}
lenCur++;
if (lenCur >= lenMax && (len || npt <= 1))
{
nseg++;
pseg = CheckDashStorage(&psegBase, nseg, &nsegMax);
if (!pseg)
return (miDashPtr)NULL;
pseg->pt.x = x;
pseg->pt.y = y;
pseg->e1 = e1;
pseg->e2 = e2;
pseg->e = e;
which = ~which;
pseg->which = which;
pseg->newLine = 0;
/* move on to next dash */
iDash++;
if (iDash >= nDash)
iDash = 0;
lenMax = pDash[iDash];
lenCur = 0;
}
} /* while len-- */
} /* while --npt */
if (lenCur == 0 && nseg != 0)
{
nseg--;
which = ~which;
}
*pnseg = nseg;
pseg = CheckDashStorage(&psegBase, nseg+1, &nsegMax);
if (!pseg)
return (miDashPtr)NULL;
pseg->pt = pt2;
pseg->e = base_e;
pseg->which = which;
pseg->newLine = 0;
return psegBase;
}
#define NSEGDELTA 16
/* returns a pointer to the pseg[nseg-1], growing the storage as
necessary. this interface seems unnecessarily cumbersome.
*/
static miDashPtr
CheckDashStorage(miDashPtr *ppseg, int nseg, int *pnsegMax)
#if 0
miDashPtr *ppseg; /* base pointer */
int nseg; /* number of segment we want to write to */
int *pnsegMax; /* size (in segments) of list so far */
#endif
{
if (nseg > *pnsegMax)
{
miDashPtr newppseg;
*pnsegMax += NSEGDELTA;
newppseg = (miDashPtr)g_realloc(*ppseg,
(*pnsegMax)*sizeof(miDashRec));
if (!newppseg)
{
g_free(*ppseg);
return (miDashPtr)NULL;
}
*ppseg = newppseg;
}
return(*ppseg+(nseg-1));
}
void
miStepDash (int dist, int *pDashIndex, unsigned char *pDash,
int numInDashList, int *pDashOffset)
#if 0
int dist; /* distance to step */
int *pDashIndex; /* current dash */
unsigned char *pDash; /* dash list */
int numInDashList; /* total length of dash list */
int *pDashOffset; /* offset into current dash */
#endif
{
int dashIndex, dashOffset;
int totallen;
int i;
dashIndex = *pDashIndex;
dashOffset = *pDashOffset;
if (dist < pDash[dashIndex] - dashOffset)
{
*pDashOffset = dashOffset + dist;
return;
}
dist -= pDash[dashIndex] - dashOffset;
if (++dashIndex == numInDashList)
dashIndex = 0;
totallen = 0;
for (i = 0; i < numInDashList; i++)
totallen += pDash[i];
if (totallen <= dist)
dist = dist % totallen;
while (dist >= pDash[dashIndex])
{
dist -= pDash[dashIndex];
if (++dashIndex == numInDashList)
dashIndex = 0;
}
*pDashIndex = dashIndex;
*pDashOffset = dist;
}