gtk2/gdk/linux-fb/mizerline.c
Federico Mena Quintero 80581c3011 Fixes #136082 and #135265, patch by Morten Welinder.
2004-03-05  Federico Mena Quintero  <federico@ximian.com>

	Fixes #136082 and #135265, patch by Morten Welinder.

	* configure.in: Use AC_SYS_LARGEFILE.

	* */*.c: #include <config.h>
2004-03-06 03:38:59 +00:00

333 lines
8.5 KiB
C

/* $XFree86: xc/programs/Xserver/mi/mizerline.c,v 3.4 1999/10/14 04:43:16 dawes Exp $ */
/***********************************************************
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in this Software without prior written authorization from The Open Group.
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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Permission to use, copy, modify, and distribute this software and its
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provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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******************************************************************/
/* $TOG: mizerline.c /main/18 1998/02/09 14:49:45 kaleb $ */
#include <config.h>
#include "mi.h"
#include "miline.h"
/* Draw lineSolid, fillStyle-independent zero width lines.
*
* Must keep X and Y coordinates in "ints" at least until after they're
* translated and clipped to accomodate CoordModePrevious lines with very
* large coordinates.
*
* Draws the same pixels regardless of sign(dx) or sign(dy).
*
* Ken Whaley
*
*/
/* largest positive value that can fit into a component of a point.
* Assumes that the point structure is {type x, y;} where type is
* a signed type.
*/
#define MAX_COORDINATE ((1 << (((sizeof(GdkPoint) >> 1) << 3) - 1)) - 1)
#define MI_OUTPUT_POINT(xx, yy)\
{\
if ( !new_span && yy == current_y)\
{\
if (xx < spans->x)\
spans->x = xx;\
spans->width++; \
}\
else\
{\
++Nspans;\
++spans;\
spans->x = xx;\
spans->y = yy;\
spans->width = 1; \
current_y = yy;\
new_span = FALSE;\
}\
}
void
miZeroLine(pDraw, pGC, mode, npt, pptInit)
GdkDrawable* pDraw;
GdkGC* pGC;
int mode; /* Origin or Previous */
int npt; /* number of points */
GdkPoint* pptInit;
{
int Nspans, current_y = 0;
GdkPoint* ppt;
GdkSpan* pspanInit, *spans;
int list_len;
int xleft, ytop, xright, ybottom;
int new_x1, new_y1, new_x2, new_y2;
int x = 0, y = 0, x1, y1, x2, y2, xstart, ystart;
int oc1, oc2;
int result;
int pt1_clipped, pt2_clipped = 0;
gboolean new_span;
int signdx, signdy;
int clipdx, clipdy;
int width, height;
int adx, ady;
int octant;
unsigned int bias = miGetZeroLineBias();
int e, e1, e2, e3; /* Bresenham error terms */
int length; /* length of lines == # of pixels on major axis */
xleft = 0;
ytop = 0;
xright = GDK_DRAWABLE_FBDATA(pDraw)->width - 1;
ybottom = GDK_DRAWABLE_FBDATA(pDraw)->height - 1;
/* it doesn't matter whether we're in drawable or screen coordinates,
* FillSpans simply cannot take starting coordinates outside of the
* range of a GdkPoint component.
*/
/* since we're clipping to the drawable's boundaries & coordinate
* space boundaries, we're guaranteed that the larger of width/height
* is the longest span we'll need to output
*/
width = xright - xleft + 1;
height = ybottom - ytop + 1;
list_len = (height >= width) ? height : width;
pspanInit = (GdkSpan*)ALLOCATE_LOCAL(list_len * sizeof(GdkSpan));
if (!pspanInit)
return;
Nspans = 0;
new_span = TRUE;
spans = pspanInit - 1;
ppt = pptInit;
xstart = ppt->x;
ystart = ppt->y;
/* x2, y2, oc2 copied to x1, y1, oc1 at top of loop to simplify
* iteration logic
*/
x2 = xstart;
y2 = ystart;
oc2 = 0;
MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom);
while (--npt > 0)
{
if (Nspans > 0)
gdk_fb_fill_spans(pDraw, pGC, pspanInit, Nspans, FALSE);
Nspans = 0;
new_span = TRUE;
spans = pspanInit - 1;
x1 = x2;
y1 = y2;
oc1 = oc2;
++ppt;
x2 = ppt->x;
y2 = ppt->y;
oc2 = 0;
MIOUTCODES(oc2, x2, y2, xleft, ytop, xright, ybottom);
CalcLineDeltas(x1, y1, x2, y2, adx, ady, signdx, signdy, 1, 1, octant);
if (adx > ady)
{
e1 = ady << 1;
e2 = e1 - (adx << 1);
e = e1 - adx;
length = adx; /* don't draw endpoint in main loop */
FIXUP_ERROR(e, octant, bias);
new_x1 = x1;
new_y1 = y1;
new_x2 = x2;
new_y2 = y2;
pt1_clipped = 0;
pt2_clipped = 0;
if ((oc1 | oc2) != 0)
{
result = miZeroClipLine(xleft, ytop, xright, ybottom,
&new_x1, &new_y1, &new_x2, &new_y2,
adx, ady,
&pt1_clipped, &pt2_clipped,
octant, bias, oc1, oc2);
if (result == -1)
continue;
length = abs(new_x2 - new_x1);
/* if we've clipped the endpoint, always draw the full length
* of the segment, because then the capstyle doesn't matter
*/
if (pt2_clipped)
length++;
if (pt1_clipped)
{
/* must calculate new error terms */
clipdx = abs(new_x1 - x1);
clipdy = abs(new_y1 - y1);
e += (clipdy * e2) + ((clipdx - clipdy) * e1);
}
}
/* draw the segment */
x = new_x1;
y = new_y1;
e3 = e2 - e1;
e = e - e1;
while (length--)
{
MI_OUTPUT_POINT(x, y);
e += e1;
if (e >= 0)
{
y += signdy;
e += e3;
}
x += signdx;
}
}
else /* Y major line */
{
e1 = adx << 1;
e2 = e1 - (ady << 1);
e = e1 - ady;
length = ady; /* don't draw endpoint in main loop */
SetYMajorOctant(octant);
FIXUP_ERROR(e, octant, bias);
new_x1 = x1;
new_y1 = y1;
new_x2 = x2;
new_y2 = y2;
pt1_clipped = 0;
pt2_clipped = 0;
if ((oc1 | oc2) != 0)
{
result = miZeroClipLine(xleft, ytop, xright, ybottom,
&new_x1, &new_y1, &new_x2, &new_y2,
adx, ady,
&pt1_clipped, &pt2_clipped,
octant, bias, oc1, oc2);
if (result == -1)
continue;
length = abs(new_y2 - new_y1);
/* if we've clipped the endpoint, always draw the full length
* of the segment, because then the capstyle doesn't matter
*/
if (pt2_clipped)
length++;
if (pt1_clipped)
{
/* must calculate new error terms */
clipdx = abs(new_x1 - x1);
clipdy = abs(new_y1 - y1);
e += (clipdx * e2) + ((clipdy - clipdx) * e1);
}
}
/* draw the segment */
x = new_x1;
y = new_y1;
e3 = e2 - e1;
e = e - e1;
while (length--)
{
MI_OUTPUT_POINT(x, y);
e += e1;
if (e >= 0)
{
x += signdx;
e += e3;
}
y += signdy;
}
}
}
/* only do the capnotlast check on the last segment
* and only if the endpoint wasn't clipped. And then, if the last
* point is the same as the first point, do not draw it, unless the
* line is degenerate
*/
if ( (! pt2_clipped) && (GDK_GC_FBDATA(pGC)->values.cap_style != GDK_CAP_NOT_LAST) &&
(((xstart != x2) || (ystart != y2)) || (ppt == pptInit + 1)))
{
MI_OUTPUT_POINT(x, y);
}
if (Nspans > 0)
gdk_fb_fill_spans(pDraw, pGC, pspanInit, Nspans, FALSE);
DEALLOCATE_LOCAL(pspanInit);
}
void
miZeroDashLine(dst, pgc, mode, nptInit, pptInit)
GdkDrawable* dst;
GdkGC* pgc;
int mode;
int nptInit; /* number of points in polyline */
GdkPoint *pptInit; /* points in the polyline */
{
/* XXX kludge until real zero-width dash code is written */
GDK_GC_FBDATA(pgc)->values.line_width = 1;
miWideDash (dst, pgc, mode, nptInit, pptInit);
GDK_GC_FBDATA(pgc)->values.line_width = 0;
}