gtk2/gdk/linux-fb/miwideline.c
Elliot Lee 98bacfb792 Bugfixorama
Bugfixorama
2000-08-09 17:26:29 +00:00

2106 lines
48 KiB
C

/* $TOG: miwideline.c /main/60 1998/03/07 17:40:23 kaleb $ */
/*
Copyright 1988, 1998 The Open Group
All Rights Reserved.
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.
*/
/* $XFree86: xc/programs/Xserver/mi/miwideline.c,v 1.7 1999/10/13 22:33:13 dawes Exp $ */
/* Author: Keith Packard, MIT X Consortium */
/*
* Mostly integer wideline code. Uses a technique similar to
* bresenham zero-width lines, except walks an X edge
*/
#include <stdio.h>
#ifdef _XOPEN_SOURCE
#include <math.h>
#else
#define _XOPEN_SOURCE /* to get prototype for hypot on some systems */
#include <math.h>
#undef _XOPEN_SOURCE
#endif
#include "mi.h"
#include "miwideline.h"
#ifdef ICEILTEMPDECL
ICEILTEMPDECL
#endif
static void
miLineArc (GdkDrawable *pDraw, GdkGC *pGC, GdkColor *pixel, SpanDataPtr spanData,
LineFacePtr leftFace, LineFacePtr rightFace, double xorg, double yorg, gboolean isInt);
/*
* spans-based polygon filler
*/
void
miFillPolyHelper (pDrawable, pGC, pixel, spanData, y, overall_height,
left, right, left_count, right_count)
GdkDrawable* pDrawable;
GdkGC* pGC;
GdkColor *pixel;
SpanDataPtr spanData;
int y; /* start y coordinate */
int overall_height; /* height of entire segment */
PolyEdgePtr left, right;
int left_count, right_count;
{
register int left_x = 0, left_e = 0;
int left_stepx = 0;
int left_signdx = 0;
int left_dy = 0, left_dx = 0;
register int right_x = 0, right_e = 0;
int right_stepx = 0;
int right_signdx = 0;
int right_dy = 0, right_dx = 0;
int height = 0;
int left_height = 0, right_height = 0;
register GdkRectangle* ppt;
GdkRectangle* pptInit;
GdkColor oldPixel;
int xorg;
Spans spanRec;
left_height = 0;
right_height = 0;
if (!spanData)
{
pptInit = (GdkRectangle*) ALLOCATE_LOCAL (overall_height * sizeof(*ppt));
if (!pptInit)
return;
ppt = pptInit;
oldPixel = GDK_GC_FBDATA(pGC)->values.foreground;
if (pixel->pixel != oldPixel.pixel)
{
gdk_gc_set_foreground(pGC, pixel);
}
}
else
{
spanRec.points = (GdkRectangle*) g_malloc (overall_height * sizeof (*ppt));
if (!spanRec.points)
return;
ppt = spanRec.points;
}
xorg = 0;
while ((left_count || left_height) &&
(right_count || right_height))
{
MIPOLYRELOADLEFT
MIPOLYRELOADRIGHT
height = left_height;
if (height > right_height)
height = right_height;
left_height -= height;
right_height -= height;
while (--height >= 0)
{
if (right_x >= left_x)
{
ppt->y = y;
ppt->x = left_x + xorg;
ppt->width = right_x - left_x + 1;
ppt->height = 1;
ppt++;
}
y++;
MIPOLYSTEPLEFT
MIPOLYSTEPRIGHT
}
}
if (!spanData)
{
gdk_fb_fill_spans(pDrawable, pGC, pptInit, ppt - pptInit);
DEALLOCATE_LOCAL (pptInit);
if (pixel->pixel != oldPixel.pixel)
{
gdk_gc_set_foreground(pGC, &oldPixel);
}
}
else
{
spanRec.count = ppt - spanRec.points;
AppendSpanGroup (pGC, pixel, &spanRec, spanData)
}
}
static void
miFillRectPolyHelper (pDrawable, pGC, pixel, spanData, x, y, w, h)
GdkDrawable* pDrawable;
GdkGC* pGC;
GdkColor* pixel;
SpanDataPtr spanData;
int x, y, w, h;
{
register GdkRectangle* ppt;
GdkColor oldPixel;
Spans spanRec;
GdkRectangle rect;
if (!spanData)
{
rect.x = x;
rect.y = y;
rect.width = w;
rect.height = h;
oldPixel = GDK_GC_FBDATA(pGC)->values.foreground;
if (pixel->pixel != oldPixel.pixel)
{
gdk_gc_set_foreground(pGC, pixel);
}
gdk_fb_fill_spans(pDrawable, pGC, &rect, 1);
if (pixel->pixel != oldPixel.pixel)
{
gdk_gc_set_foreground(pGC, &oldPixel);
}
}
else
{
spanRec.points = (GdkRectangle*) g_malloc (h * sizeof (*ppt));
if (!spanRec.points)
return;
ppt = spanRec.points;
while (h--)
{
ppt->x = x;
ppt->y = y;
ppt->width = w;
ppt->height = 1;
ppt++;
y++;
}
spanRec.count = ppt - spanRec.points;
AppendSpanGroup (pGC, pixel, &spanRec, spanData)
}
}
/* static */ int
miPolyBuildEdge (x0, y0, k, dx, dy, xi, yi, left, edge)
double x0, y0;
double k; /* x0 * dy - y0 * dx */
register int dx, dy;
int xi, yi;
int left;
register PolyEdgePtr edge;
{
int x, y, e;
int xady;
if (dy < 0)
{
dy = -dy;
dx = -dx;
k = -k;
}
#ifdef NOTDEF
{
double realk, kerror;
realk = x0 * dy - y0 * dx;
kerror = Fabs (realk - k);
if (kerror > .1)
printf ("realk: %g k: %g\n", realk, k);
}
#endif
y = ICEIL (y0);
xady = ICEIL (k) + y * dx;
if (xady <= 0)
x = - (-xady / dy) - 1;
else
x = (xady - 1) / dy;
e = xady - x * dy;
if (dx >= 0)
{
edge->signdx = 1;
edge->stepx = dx / dy;
edge->dx = dx % dy;
}
else
{
edge->signdx = -1;
edge->stepx = - (-dx / dy);
edge->dx = -dx % dy;
e = dy - e + 1;
}
edge->dy = dy;
edge->x = x + left + xi;
edge->e = e - dy; /* bias to compare against 0 instead of dy */
return y + yi;
}
#define StepAround(v, incr, max) (((v) + (incr) < 0) ? (max - 1) : ((v) + (incr) == max) ? 0 : ((v) + (incr)))
/* static */ int
miPolyBuildPoly (vertices, slopes, count, xi, yi, left, right, pnleft, pnright, h)
register PolyVertexPtr vertices;
register PolySlopePtr slopes;
int count;
int xi, yi;
PolyEdgePtr left, right;
int *pnleft, *pnright;
int *h;
{
int top, bottom;
double miny, maxy;
register int i;
int j;
int clockwise;
int slopeoff;
register int s;
register int nright, nleft;
int y, lasty = 0, bottomy, topy = 0;
/* find the top of the polygon */
maxy = miny = vertices[0].y;
bottom = top = 0;
for (i = 1; i < count; i++)
{
if (vertices[i].y < miny)
{
top = i;
miny = vertices[i].y;
}
if (vertices[i].y >= maxy)
{
bottom = i;
maxy = vertices[i].y;
}
}
clockwise = 1;
slopeoff = 0;
i = top;
j = StepAround (top, -1, count);
if (slopes[j].dy * slopes[i].dx > slopes[i].dy * slopes[j].dx)
{
clockwise = -1;
slopeoff = -1;
}
bottomy = ICEIL (maxy) + yi;
nright = 0;
s = StepAround (top, slopeoff, count);
i = top;
while (i != bottom)
{
if (slopes[s].dy != 0)
{
y = miPolyBuildEdge (vertices[i].x, vertices[i].y,
slopes[s].k,
slopes[s].dx, slopes[s].dy,
xi, yi, 0,
&right[nright]);
if (nright != 0)
right[nright-1].height = y - lasty;
else
topy = y;
nright++;
lasty = y;
}
i = StepAround (i, clockwise, count);
s = StepAround (s, clockwise, count);
}
if (nright != 0)
right[nright-1].height = bottomy - lasty;
if (slopeoff == 0)
slopeoff = -1;
else
slopeoff = 0;
nleft = 0;
s = StepAround (top, slopeoff, count);
i = top;
while (i != bottom)
{
if (slopes[s].dy != 0)
{
y = miPolyBuildEdge (vertices[i].x, vertices[i].y,
slopes[s].k,
slopes[s].dx, slopes[s].dy, xi, yi, 1,
&left[nleft]);
if (nleft != 0)
left[nleft-1].height = y - lasty;
nleft++;
lasty = y;
}
i = StepAround (i, -clockwise, count);
s = StepAround (s, -clockwise, count);
}
if (nleft != 0)
left[nleft-1].height = bottomy - lasty;
*pnleft = nleft;
*pnright = nright;
*h = bottomy - topy;
return topy;
}
static void
miLineOnePoint (pDrawable, pGC, pixel, spanData, x, y)
GdkDrawable* pDrawable;
GdkGC* pGC;
GdkColor* pixel;
SpanDataPtr spanData;
int x, y;
{
GdkColor oldPixel;
GdkRectangle rect;
MILINESETPIXEL (pDrawable, pGC, pixel, oldPixel);
rect.width = 1;
rect.height = 1;
gdk_fb_fill_spans(pDrawable, pGC, &rect, 1);
MILINERESETPIXEL (pDrawable, pGC, pixel, oldPixel);
}
static void
miLineJoin (GdkDrawable *pDrawable, GdkGC *pGC, GdkColor *pixel, SpanDataPtr spanData, LineFacePtr pLeft, LineFacePtr pRight)
{
double mx, my;
double denom = 0.0;
PolyVertexRec vertices[4];
PolySlopeRec slopes[4];
int edgecount;
PolyEdgeRec left[4], right[4];
int nleft, nright;
int y, height;
int swapslopes;
int joinStyle = GDK_GC_FBDATA(pGC)->values.join_style;
int lw = GDK_GC_FBDATA(pGC)->values.line_width;
if (lw == 1 && !spanData) {
/* Lines going in the same direction have no join */
if (pLeft->dx >= 0 == pRight->dx <= 0)
return;
if (joinStyle != GDK_JOIN_ROUND) {
denom = - pLeft->dx * (double)pRight->dy + pRight->dx * (double)pLeft->dy;
if (denom == 0)
return; /* no join to draw */
}
if (joinStyle != GDK_JOIN_MITER) {
miLineOnePoint (pDrawable, pGC, pixel, spanData, pLeft->x, pLeft->y);
return;
}
} else {
if (joinStyle == GDK_JOIN_ROUND)
{
miLineArc(pDrawable, pGC, pixel, spanData,
pLeft, pRight,
(double)0.0, (double)0.0, TRUE);
return;
}
denom = - pLeft->dx * (double)pRight->dy + pRight->dx * (double)pLeft->dy;
if (denom == 0.0)
return; /* no join to draw */
}
swapslopes = 0;
if (denom > 0)
{
pLeft->xa = -pLeft->xa;
pLeft->ya = -pLeft->ya;
pLeft->dx = -pLeft->dx;
pLeft->dy = -pLeft->dy;
}
else
{
swapslopes = 1;
pRight->xa = -pRight->xa;
pRight->ya = -pRight->ya;
pRight->dx = -pRight->dx;
pRight->dy = -pRight->dy;
}
vertices[0].x = pRight->xa;
vertices[0].y = pRight->ya;
slopes[0].dx = -pRight->dy;
slopes[0].dy = pRight->dx;
slopes[0].k = 0;
vertices[1].x = 0;
vertices[1].y = 0;
slopes[1].dx = pLeft->dy;
slopes[1].dy = -pLeft->dx;
slopes[1].k = 0;
vertices[2].x = pLeft->xa;
vertices[2].y = pLeft->ya;
if (joinStyle == GDK_JOIN_MITER)
{
my = (pLeft->dy * (pRight->xa * pRight->dy - pRight->ya * pRight->dx) -
pRight->dy * (pLeft->xa * pLeft->dy - pLeft->ya * pLeft->dx )) /
denom;
if (pLeft->dy != 0)
{
mx = pLeft->xa + (my - pLeft->ya) *
(double) pLeft->dx / (double) pLeft->dy;
}
else
{
mx = pRight->xa + (my - pRight->ya) *
(double) pRight->dx / (double) pRight->dy;
}
/* check miter limit */
if ((mx * mx + my * my) * 4 > SQSECANT * lw * lw)
joinStyle = GDK_JOIN_BEVEL;
}
if (joinStyle == GDK_JOIN_MITER)
{
slopes[2].dx = pLeft->dx;
slopes[2].dy = pLeft->dy;
slopes[2].k = pLeft->k;
if (swapslopes)
{
slopes[2].dx = -slopes[2].dx;
slopes[2].dy = -slopes[2].dy;
slopes[2].k = -slopes[2].k;
}
vertices[3].x = mx;
vertices[3].y = my;
slopes[3].dx = pRight->dx;
slopes[3].dy = pRight->dy;
slopes[3].k = pRight->k;
if (swapslopes)
{
slopes[3].dx = -slopes[3].dx;
slopes[3].dy = -slopes[3].dy;
slopes[3].k = -slopes[3].k;
}
edgecount = 4;
}
else
{
double scale, dx, dy, adx, ady;
adx = dx = pRight->xa - pLeft->xa;
ady = dy = pRight->ya - pLeft->ya;
if (adx < 0)
adx = -adx;
if (ady < 0)
ady = -ady;
scale = ady;
if (adx > ady)
scale = adx;
slopes[2].dx = (dx * 65536) / scale;
slopes[2].dy = (dy * 65536) / scale;
slopes[2].k = ((pLeft->xa + pRight->xa) * slopes[2].dy -
(pLeft->ya + pRight->ya) * slopes[2].dx) / 2.0;
edgecount = 3;
}
y = miPolyBuildPoly (vertices, slopes, edgecount, pLeft->x, pLeft->y,
left, right, &nleft, &nright, &height);
miFillPolyHelper (pDrawable, pGC, pixel, spanData, y, height, left, right, nleft, nright);
}
static int
miLineArcI (pDraw, pGC, xorg, yorg, points, widths)
GdkDrawable* pDraw;
GdkGC* pGC;
int xorg, yorg;
GdkRectangle* points;
{
register GdkRectangle* tpts, *bpts;
register int x, y, e, ex, slw;
tpts = points;
slw = GDK_GC_FBDATA(pGC)->values.line_width;
if (slw == 1)
{
tpts->x = xorg;
tpts->y = yorg;
tpts->width = 1;
tpts->height = 1;
return 1;
}
bpts = tpts + slw;
y = (slw >> 1) + 1;
if (slw & 1)
e = - ((y << 2) + 3);
else
e = - (y << 3);
ex = -4;
x = 0;
while (y)
{
e += (y << 3) - 4;
while (e >= 0)
{
x++;
e += (ex = -((x << 3) + 4));
}
y--;
slw = (x << 1) + 1;
if ((e == ex) && (slw > 1))
slw--;
tpts->x = xorg - x;
tpts->y = yorg - y;
tpts->width = slw;
tpts->height = 1;
tpts++;
if ((y != 0) && ((slw > 1) || (e != ex)))
{
bpts--;
bpts->x = xorg - x;
bpts->y = yorg + y;
bpts->height = 1;
bpts->width = slw;
}
}
return (GDK_GC_FBDATA(pGC)->values.line_width);
}
#define CLIPSTEPEDGE(edgey,edge,edgeleft) \
if (ybase == edgey) \
{ \
if (edgeleft) \
{ \
if (edge->x > xcl) \
xcl = edge->x; \
} \
else \
{ \
if (edge->x < xcr) \
xcr = edge->x; \
} \
edgey++; \
edge->x += edge->stepx; \
edge->e += edge->dx; \
if (edge->e > 0) \
{ \
edge->x += edge->signdx; \
edge->e -= edge->dy; \
} \
}
static int
miLineArcD (pDraw, pGC, xorg, yorg, points, widths,
edge1, edgey1, edgeleft1, edge2, edgey2, edgeleft2)
GdkDrawable* pDraw;
GdkGC* pGC;
double xorg, yorg;
GdkRectangle* points;
PolyEdgePtr edge1, edge2;
int edgey1, edgey2;
gboolean edgeleft1, edgeleft2;
{
register GdkRectangle* pts;
double radius, x0, y0, el, er, yk, xlk, xrk, k;
int xbase, ybase, y, boty, xl, xr, xcl, xcr;
int ymin, ymax;
gboolean edge1IsMin, edge2IsMin;
int ymin1, ymin2;
pts = points;
xbase = floor(xorg);
x0 = xorg - xbase;
ybase = ICEIL (yorg);
y0 = yorg - ybase;
xlk = x0 + x0 + 1.0;
xrk = x0 + x0 - 1.0;
yk = y0 + y0 - 1.0;
radius = ((double)GDK_GC_FBDATA(pGC)->values.line_width) / 2.0;
y = floor(radius - y0 + 1.0);
ybase -= y;
ymin = ybase;
ymax = 65536;
edge1IsMin = FALSE;
ymin1 = edgey1;
if (edge1->dy >= 0)
{
if (!edge1->dy)
{
if (edgeleft1)
edge1IsMin = TRUE;
else
ymax = edgey1;
edgey1 = 65536;
}
else
{
if ((edge1->signdx < 0) == edgeleft1)
edge1IsMin = TRUE;
}
}
edge2IsMin = FALSE;
ymin2 = edgey2;
if (edge2->dy >= 0)
{
if (!edge2->dy)
{
if (edgeleft2)
edge2IsMin = TRUE;
else
ymax = edgey2;
edgey2 = 65536;
}
else
{
if ((edge2->signdx < 0) == edgeleft2)
edge2IsMin = TRUE;
}
}
if (edge1IsMin)
{
ymin = ymin1;
if (edge2IsMin && ymin1 > ymin2)
ymin = ymin2;
} else if (edge2IsMin)
ymin = ymin2;
el = radius * radius - ((y + y0) * (y + y0)) - (x0 * x0);
er = el + xrk;
xl = 1;
xr = 0;
if (x0 < 0.5)
{
xl = 0;
el -= xlk;
}
boty = (y0 < -0.5) ? 1 : 0;
if (ybase + y - boty > ymax)
boty = ymax - ybase - y;
while (y > boty)
{
k = (y << 1) + yk;
er += k;
while (er > 0.0)
{
xr++;
er += xrk - (xr << 1);
}
el += k;
while (el >= 0.0)
{
xl--;
el += (xl << 1) - xlk;
}
y--;
ybase++;
if (ybase < ymin)
continue;
xcl = xl + xbase;
xcr = xr + xbase;
CLIPSTEPEDGE(edgey1, edge1, edgeleft1);
CLIPSTEPEDGE(edgey2, edge2, edgeleft2);
if (xcr >= xcl)
{
pts->x = xcl;
pts->y = ybase;
pts->width = xcr - xcl + 1;
pts->height = 1;
pts++;
}
}
er = xrk - (xr << 1) - er;
el = (xl << 1) - xlk - el;
boty = floor(-y0 - radius + 1.0);
if (ybase + y - boty > ymax)
boty = ymax - ybase - y;
while (y > boty)
{
k = (y << 1) + yk;
er -= k;
while ((er >= 0.0) && (xr >= 0))
{
xr--;
er += xrk - (xr << 1);
}
el -= k;
while ((el > 0.0) && (xl <= 0))
{
xl++;
el += (xl << 1) - xlk;
}
y--;
ybase++;
if (ybase < ymin)
continue;
xcl = xl + xbase;
xcr = xr + xbase;
CLIPSTEPEDGE(edgey1, edge1, edgeleft1);
CLIPSTEPEDGE(edgey2, edge2, edgeleft2);
if (xcr >= xcl)
{
pts->x = xcl;
pts->y = ybase;
pts->width = xcr - xcl + 1;
pts->height = 1;
pts++;
}
}
return (pts - points);
}
int
miRoundJoinFace (face, edge, leftEdge)
register LineFacePtr face;
register PolyEdgePtr edge;
gboolean *leftEdge;
{
int y;
int dx, dy;
double xa, ya;
gboolean left;
dx = -face->dy;
dy = face->dx;
xa = face->xa;
ya = face->ya;
left = 1;
if (ya > 0)
{
ya = 0.0;
xa = 0.0;
}
if (dy < 0 || (dy == 0 && dx > 0))
{
dx = -dx;
dy = -dy;
left = !left;
}
if (dx == 0 && dy == 0)
dy = 1;
if (dy == 0)
{
y = ICEIL (face->ya) + face->y;
edge->x = -32767;
edge->stepx = 0;
edge->signdx = 0;
edge->e = -1;
edge->dy = 0;
edge->dx = 0;
edge->height = 0;
}
else
{
y = miPolyBuildEdge (xa, ya, 0.0, dx, dy, face->x, face->y, !left, edge);
edge->height = 32767;
}
*leftEdge = !left;
return y;
}
void
miRoundJoinClip (pLeft, pRight, edge1, edge2, y1, y2, left1, left2)
register LineFacePtr pLeft, pRight;
PolyEdgePtr edge1, edge2;
int *y1, *y2;
gboolean *left1, *left2;
{
double denom;
denom = - pLeft->dx * (double)pRight->dy + pRight->dx * (double)pLeft->dy;
if (denom >= 0)
{
pLeft->xa = -pLeft->xa;
pLeft->ya = -pLeft->ya;
}
else
{
pRight->xa = -pRight->xa;
pRight->ya = -pRight->ya;
}
*y1 = miRoundJoinFace (pLeft, edge1, left1);
*y2 = miRoundJoinFace (pRight, edge2, left2);
}
int
miRoundCapClip (face, isInt, edge, leftEdge)
register LineFacePtr face;
gboolean isInt;
register PolyEdgePtr edge;
gboolean *leftEdge;
{
int y;
register int dx, dy;
double xa, ya, k;
gboolean left;
dx = -face->dy;
dy = face->dx;
xa = face->xa;
ya = face->ya;
k = 0.0;
if (!isInt)
k = face->k;
left = 1;
if (dy < 0 || (dy == 0 && dx > 0))
{
dx = -dx;
dy = -dy;
xa = -xa;
ya = -ya;
left = !left;
}
if (dx == 0 && dy == 0)
dy = 1;
if (dy == 0)
{
y = ICEIL (face->ya) + face->y;
edge->x = -32767;
edge->stepx = 0;
edge->signdx = 0;
edge->e = -1;
edge->dy = 0;
edge->dx = 0;
edge->height = 0;
}
else
{
y = miPolyBuildEdge (xa, ya, k, dx, dy, face->x, face->y, !left, edge);
edge->height = 32767;
}
*leftEdge = !left;
return y;
}
static void
miLineArc (pDraw, pGC, pixel, spanData, leftFace, rightFace, xorg, yorg, isInt)
GdkDrawable* pDraw;
register GdkGC* pGC;
GdkColor* pixel;
SpanDataPtr spanData;
register LineFacePtr leftFace, rightFace;
double xorg, yorg;
gboolean isInt;
{
GdkRectangle* points;
int xorgi = 0, yorgi = 0;
GdkColor oldPixel;
Spans spanRec;
int n;
PolyEdgeRec edge1, edge2;
int edgey1, edgey2;
gboolean edgeleft1, edgeleft2;
if (isInt)
{
xorgi = leftFace ? leftFace->x : rightFace->x;
yorgi = leftFace ? leftFace->y : rightFace->y;
}
edgey1 = 65536;
edgey2 = 65536;
edge1.x = 0; /* not used, keep memory checkers happy */
edge1.dy = -1;
edge2.x = 0; /* not used, keep memory checkers happy */
edge2.dy = -1;
edgeleft1 = FALSE;
edgeleft2 = FALSE;
if (((GDK_GC_FBDATA(pGC)->values.line_style != GDK_LINE_SOLID || GDK_GC_FBDATA(pGC)->values.line_width > 2) &&
(GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND && GDK_GC_FBDATA(pGC)->values.join_style != GDK_JOIN_ROUND)) ||
(GDK_GC_FBDATA(pGC)->values.join_style == GDK_JOIN_ROUND && GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_BUTT))
{
if (isInt)
{
xorg = (double) xorgi;
yorg = (double) yorgi;
}
if (leftFace && rightFace)
{
miRoundJoinClip (leftFace, rightFace, &edge1, &edge2,
&edgey1, &edgey2, &edgeleft1, &edgeleft2);
}
else if (leftFace)
{
edgey1 = miRoundCapClip (leftFace, isInt, &edge1, &edgeleft1);
}
else if (rightFace)
{
edgey2 = miRoundCapClip (rightFace, isInt, &edge2, &edgeleft2);
}
isInt = FALSE;
}
if (!spanData)
{
points = (GdkRectangle*)ALLOCATE_LOCAL(sizeof(GdkRectangle) * GDK_GC_FBDATA(pGC)->values.line_width);
if (!points)
return;
oldPixel = GDK_GC_FBDATA(pGC)->values.foreground;
if (pixel->pixel != oldPixel.pixel)
{
gdk_gc_set_foreground(pGC, pixel);
}
}
else
{
points = (GdkRectangle*) g_malloc (GDK_GC_FBDATA(pGC)->values.line_width * sizeof (GdkRectangle));
if (!points)
return;
spanRec.points = points;
}
if (isInt)
n = miLineArcI(pDraw, pGC, xorgi, yorgi, points);
else
n = miLineArcD(pDraw, pGC, xorg, yorg, points,
&edge1, edgey1, edgeleft1,
&edge2, edgey2, edgeleft2);
if (!spanData)
{
gdk_fb_fill_spans(pDraw, pGC, points, n);
DEALLOCATE_LOCAL(points);
if (pixel->pixel != oldPixel.pixel)
{
gdk_gc_set_foreground(pGC, &oldPixel);
}
}
else
{
spanRec.count = n;
AppendSpanGroup (pGC, pixel, &spanRec, spanData)
}
}
void
miLineProjectingCap (pDrawable, pGC, pixel, spanData, face, isLeft, xorg, yorg, isInt)
GdkDrawable* pDrawable;
register GdkGC* pGC;
GdkColor *pixel;
SpanDataPtr spanData;
register LineFacePtr face;
gboolean isLeft;
double xorg, yorg;
gboolean isInt;
{
int xorgi = 0, yorgi = 0;
int lw;
PolyEdgeRec lefts[2], rights[2];
int lefty, righty, topy, bottomy;
PolyEdgePtr left, right;
PolyEdgePtr top, bottom;
double xa,ya;
double k;
double xap, yap;
int dx, dy;
double projectXoff, projectYoff;
double maxy;
int finaly;
if (isInt)
{
xorgi = face->x;
yorgi = face->y;
}
lw = GDK_GC_FBDATA(pGC)->values.line_width;
dx = face->dx;
dy = face->dy;
k = face->k;
if (dy == 0)
{
lefts[0].height = lw;
lefts[0].x = xorgi;
if (isLeft)
lefts[0].x -= (lw >> 1);
lefts[0].stepx = 0;
lefts[0].signdx = 1;
lefts[0].e = -lw;
lefts[0].dx = 0;
lefts[0].dy = lw;
rights[0].height = lw;
rights[0].x = xorgi;
if (!isLeft)
rights[0].x += ((lw + 1) >> 1);
rights[0].stepx = 0;
rights[0].signdx = 1;
rights[0].e = -lw;
rights[0].dx = 0;
rights[0].dy = lw;
miFillPolyHelper (pDrawable, pGC, pixel, spanData, yorgi - (lw >> 1), lw,
lefts, rights, 1, 1);
}
else if (dx == 0)
{
topy = yorgi;
bottomy = yorgi + dy;
if (isLeft)
topy -= (lw >> 1);
else
bottomy += (lw >> 1);
lefts[0].height = bottomy - topy;
lefts[0].x = xorgi - (lw >> 1);
lefts[0].stepx = 0;
lefts[0].signdx = 1;
lefts[0].e = -dy;
lefts[0].dx = dx;
lefts[0].dy = dy;
rights[0].height = bottomy - topy;
rights[0].x = lefts[0].x + (lw-1);
rights[0].stepx = 0;
rights[0].signdx = 1;
rights[0].e = -dy;
rights[0].dx = dx;
rights[0].dy = dy;
miFillPolyHelper (pDrawable, pGC, pixel, spanData, topy, bottomy - topy, lefts, rights, 1, 1);
}
else
{
xa = face->xa;
ya = face->ya;
projectXoff = -ya;
projectYoff = xa;
if (dx < 0)
{
right = &rights[1];
left = &lefts[0];
top = &rights[0];
bottom = &lefts[1];
}
else
{
right = &rights[0];
left = &lefts[1];
top = &lefts[0];
bottom = &rights[1];
}
if (isLeft)
{
righty = miPolyBuildEdge (xa, ya,
k, dx, dy, xorgi, yorgi, 0, right);
xa = -xa;
ya = -ya;
k = -k;
lefty = miPolyBuildEdge (xa - projectXoff, ya - projectYoff,
k, dx, dy, xorgi, yorgi, 1, left);
if (dx > 0)
{
ya = -ya;
xa = -xa;
}
xap = xa - projectXoff;
yap = ya - projectYoff;
topy = miPolyBuildEdge (xap, yap, xap * dx + yap * dy,
-dy, dx, xorgi, yorgi, dx > 0, top);
bottomy = miPolyBuildEdge (xa, ya,
0.0, -dy, dx, xorgi, yorgi, dx < 0, bottom);
maxy = -ya;
}
else
{
righty = miPolyBuildEdge (xa - projectXoff, ya - projectYoff,
k, dx, dy, xorgi, yorgi, 0, right);
xa = -xa;
ya = -ya;
k = -k;
lefty = miPolyBuildEdge (xa, ya,
k, dx, dy, xorgi, yorgi, 1, left);
if (dx > 0)
{
ya = -ya;
xa = -xa;
}
xap = xa - projectXoff;
yap = ya - projectYoff;
topy = miPolyBuildEdge (xa, ya, 0.0, -dy, dx, xorgi, xorgi, dx > 0, top);
bottomy = miPolyBuildEdge (xap, yap, xap * dx + yap * dy,
-dy, dx, xorgi, xorgi, dx < 0, bottom);
maxy = -ya + projectYoff;
}
finaly = ICEIL(maxy) + yorgi;
if (dx < 0)
{
left->height = bottomy - lefty;
right->height = finaly - righty;
top->height = righty - topy;
}
else
{
right->height = bottomy - righty;
left->height = finaly - lefty;
top->height = lefty - topy;
}
bottom->height = finaly - bottomy;
miFillPolyHelper (pDrawable, pGC, pixel, spanData, topy,
bottom->height + bottomy - topy, lefts, rights, 2, 2);
}
}
static void
miWideSegment (GdkDrawable *pDrawable, GdkGC *pGC, GdkColor *pixel, SpanDataPtr spanData,
int x1, int y1, int x2, int y2, gboolean projectLeft, gboolean projectRight, LineFacePtr leftFace, LineFacePtr rightFace)
{
double l, L, r;
double xa, ya;
double projectXoff = 0.0, projectYoff = 0.0;
double k;
double maxy;
int x, y;
int dx, dy;
int finaly;
PolyEdgePtr left, right;
PolyEdgePtr top, bottom;
int lefty, righty, topy, bottomy;
int signdx;
PolyEdgeRec lefts[2], rights[2];
LineFacePtr tface;
int lw = GDK_GC_FBDATA(pGC)->values.line_width;
g_assert(leftFace);
/* draw top-to-bottom always */
if (y2 < y1 || (y2 == y1 && x2 < x1))
{
x = x1;
x1 = x2;
x2 = x;
y = y1;
y1 = y2;
y2 = y;
x = projectLeft;
projectLeft = projectRight;
projectRight = x;
tface = leftFace;
leftFace = rightFace;
rightFace = tface;
}
dy = y2 - y1;
signdx = 1;
dx = x2 - x1;
if (dx < 0)
signdx = -1;
g_assert(leftFace);
leftFace->x = x1;
leftFace->y = y1;
leftFace->dx = dx;
leftFace->dy = dy;
rightFace->x = x2;
rightFace->y = y2;
rightFace->dx = -dx;
rightFace->dy = -dy;
if (dy == 0)
{
rightFace->xa = 0;
rightFace->ya = (double) lw / 2.0;
rightFace->k = -(double) (lw * dx) / 2.0;
leftFace->xa = 0;
leftFace->ya = -rightFace->ya;
leftFace->k = rightFace->k;
x = x1;
if (projectLeft)
x -= (lw >> 1);
y = y1 - (lw >> 1);
dx = x2 - x;
if (projectRight)
dx += ((lw + 1) >> 1);
dy = lw;
miFillRectPolyHelper (pDrawable, pGC, pixel, spanData,
x, y, dx, dy);
}
else if (dx == 0)
{
leftFace->xa = (double) lw / 2.0;
leftFace->ya = 0;
leftFace->k = (double) (lw * dy) / 2.0;
rightFace->xa = -leftFace->xa;
rightFace->ya = 0;
rightFace->k = leftFace->k;
y = y1;
if (projectLeft)
y -= lw >> 1;
x = x1 - (lw >> 1);
dy = y2 - y;
if (projectRight)
dy += ((lw + 1) >> 1);
dx = lw;
miFillRectPolyHelper (pDrawable, pGC, pixel, spanData,
x, y, dx, dy);
}
else
{
l = ((double) lw) / 2.0;
L = hypot ((double) dx, (double) dy);
if (dx < 0)
{
right = &rights[1];
left = &lefts[0];
top = &rights[0];
bottom = &lefts[1];
}
else
{
right = &rights[0];
left = &lefts[1];
top = &lefts[0];
bottom = &rights[1];
}
r = l / L;
/* coord of upper bound at integral y */
ya = -r * dx;
xa = r * dy;
if (projectLeft | projectRight)
{
projectXoff = -ya;
projectYoff = xa;
}
/* xa * dy - ya * dx */
k = l * L;
leftFace->xa = xa;
leftFace->ya = ya;
leftFace->k = k;
rightFace->xa = -xa;
rightFace->ya = -ya;
rightFace->k = k;
if (projectLeft)
righty = miPolyBuildEdge (xa - projectXoff, ya - projectYoff,
k, dx, dy, x1, y1, 0, right);
else
righty = miPolyBuildEdge (xa, ya,
k, dx, dy, x1, y1, 0, right);
/* coord of lower bound at integral y */
ya = -ya;
xa = -xa;
/* xa * dy - ya * dx */
k = - k;
if (projectLeft)
lefty = miPolyBuildEdge (xa - projectXoff, ya - projectYoff,
k, dx, dy, x1, y1, 1, left);
else
lefty = miPolyBuildEdge (xa, ya,
k, dx, dy, x1, y1, 1, left);
/* coord of top face at integral y */
if (signdx > 0)
{
ya = -ya;
xa = -xa;
}
if (projectLeft)
{
double xap = xa - projectXoff;
double yap = ya - projectYoff;
topy = miPolyBuildEdge (xap, yap, xap * dx + yap * dy,
-dy, dx, x1, y1, dx > 0, top);
}
else
topy = miPolyBuildEdge (xa, ya, 0.0, -dy, dx, x1, y1, dx > 0, top);
/* coord of bottom face at integral y */
if (projectRight)
{
double xap = xa + projectXoff;
double yap = ya + projectYoff;
bottomy = miPolyBuildEdge (xap, yap, xap * dx + yap * dy,
-dy, dx, x2, y2, dx < 0, bottom);
maxy = -ya + projectYoff;
}
else
{
bottomy = miPolyBuildEdge (xa, ya,
0.0, -dy, dx, x2, y2, dx < 0, bottom);
maxy = -ya;
}
finaly = ICEIL (maxy) + y2;
if (dx < 0)
{
left->height = bottomy - lefty;
right->height = finaly - righty;
top->height = righty - topy;
}
else
{
right->height = bottomy - righty;
left->height = finaly - lefty;
top->height = lefty - topy;
}
bottom->height = finaly - bottomy;
miFillPolyHelper (pDrawable, pGC, pixel, spanData, topy,
bottom->height + bottomy - topy, lefts, rights, 2, 2);
}
}
SpanDataPtr
miSetupSpanData (pGC, spanData, npt)
register GdkGC* pGC;
SpanDataPtr spanData;
int npt;
{
if ((npt < 3 && GDK_GC_FBDATA(pGC)->values.cap_style != GDK_CAP_ROUND) || miSpansEasyRop(GDK_GC_FBDATA(pGC)->alu))
return (SpanDataPtr) NULL;
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH)
miInitSpanGroup (&spanData->bgGroup);
miInitSpanGroup (&spanData->fgGroup);
return spanData;
}
void
miCleanupSpanData (pDrawable, pGC, spanData)
GdkDrawable* pDrawable;
GdkGC* pGC;
SpanDataPtr spanData;
{
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH)
{
GdkColor oldPixel, pixel;
pixel = GDK_GC_FBDATA(pGC)->values.background;
oldPixel = GDK_GC_FBDATA(pGC)->values.foreground;
if (pixel.pixel != oldPixel.pixel)
gdk_gc_set_foreground(pGC, &pixel);
miFillUniqueSpanGroup (pDrawable, pGC, &spanData->bgGroup);
miFreeSpanGroup (&spanData->bgGroup);
if (pixel.pixel != oldPixel.pixel)
gdk_gc_set_foreground(pGC, &oldPixel);
}
miFillUniqueSpanGroup (pDrawable, pGC, &spanData->fgGroup);
miFreeSpanGroup (&spanData->fgGroup);
}
void
miWideLine (pDrawable, pGC, mode, npt, pPts)
GdkDrawable* pDrawable;
register GdkGC* pGC;
int mode;
register int npt;
register GdkPoint* pPts;
{
int x1, y1, x2, y2;
SpanDataRec spanDataRec;
SpanDataPtr spanData;
GdkColor pixel;
gboolean projectLeft, projectRight;
LineFaceRec leftFace, rightFace, prevRightFace;
LineFaceRec firstFace;
register int first;
gboolean somethingDrawn = FALSE;
gboolean selfJoin;
spanData = miSetupSpanData (pGC, &spanDataRec, npt);
pixel = GDK_GC_FBDATA(pGC)->values.foreground;
x2 = pPts->x;
y2 = pPts->y;
first = TRUE;
selfJoin = FALSE;
if (npt > 1)
{
if (0 /* mode == CoordModePrevious*/)
{
int nptTmp;
GdkPoint* pPtsTmp;
x1 = x2;
y1 = y2;
nptTmp = npt;
pPtsTmp = pPts + 1;
while (--nptTmp)
{
x1 += pPtsTmp->x;
y1 += pPtsTmp->y;
++pPtsTmp;
}
if (x2 == x1 && y2 == y1)
selfJoin = TRUE;
}
else if (x2 == pPts[npt-1].x && y2 == pPts[npt-1].y)
{
selfJoin = TRUE;
}
}
projectLeft = GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING && !selfJoin;
projectRight = FALSE;
while (--npt)
{
x1 = x2;
y1 = y2;
++pPts;
x2 = pPts->x;
y2 = pPts->y;
if (0 /* mode == CoordModePrevious */)
{
x2 += x1;
y2 += y1;
}
if (x1 != x2 || y1 != y2)
{
somethingDrawn = TRUE;
if (npt == 1 && GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING && !selfJoin)
projectRight = TRUE;
miWideSegment (pDrawable, pGC, &pixel, spanData, x1, y1, x2, y2,
projectLeft, projectRight, &leftFace, &rightFace);
if (first)
{
if (selfJoin)
firstFace = leftFace;
else if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
{
if (GDK_GC_FBDATA(pGC)->values.line_width == 1 && !spanData)
miLineOnePoint (pDrawable, pGC, &pixel, spanData, x1, y1);
else
miLineArc (pDrawable, pGC, &pixel, spanData,
&leftFace, (LineFacePtr) NULL,
(double)0.0, (double)0.0,
TRUE);
}
}
else
{
miLineJoin (pDrawable, pGC, &pixel, spanData, &leftFace,
&prevRightFace);
}
prevRightFace = rightFace;
first = FALSE;
projectLeft = FALSE;
}
if (npt == 1 && somethingDrawn)
{
if (selfJoin)
miLineJoin (pDrawable, pGC, &pixel, spanData, &firstFace,
&rightFace);
else if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
{
if (GDK_GC_FBDATA(pGC)->values.line_width == 1 && !spanData)
miLineOnePoint (pDrawable, pGC, &pixel, spanData, x2, y2);
else
miLineArc (pDrawable, pGC, &pixel, spanData,
(LineFacePtr) NULL, &rightFace,
(double)0.0, (double)0.0,
TRUE);
}
}
}
/* handle crock where all points are coincedent */
if (!somethingDrawn)
{
projectLeft = GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING;
miWideSegment (pDrawable, pGC, &pixel, spanData,
x2, y2, x2, y2, projectLeft, projectLeft,
&leftFace, &rightFace);
if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
{
miLineArc (pDrawable, pGC, &pixel, spanData,
&leftFace, (LineFacePtr) NULL,
(double)0.0, (double)0.0,
TRUE);
rightFace.dx = -1; /* sleezy hack to make it work */
miLineArc (pDrawable, pGC, &pixel, spanData,
(LineFacePtr) NULL, &rightFace,
(double)0.0, (double)0.0,
TRUE);
}
}
if (spanData)
miCleanupSpanData (pDrawable, pGC, spanData);
}
#define V_TOP 0
#define V_RIGHT 1
#define V_BOTTOM 2
#define V_LEFT 3
static void
miWideDashSegment (pDrawable, pGC, spanData, pDashOffset, pDashIndex,
x1, y1, x2, y2, projectLeft, projectRight, leftFace, rightFace)
GdkDrawable* pDrawable;
register GdkGC* pGC;
int *pDashOffset, *pDashIndex;
SpanDataPtr spanData;
int x1, y1, x2, y2;
gboolean projectLeft, projectRight;
LineFacePtr leftFace, rightFace;
{
int dashIndex, dashRemain;
unsigned char *pDash;
double L, l;
double k;
PolyVertexRec vertices[4];
PolyVertexRec saveRight, saveBottom;
PolySlopeRec slopes[4];
PolyEdgeRec left[2], right[2];
LineFaceRec lcapFace, rcapFace;
int nleft, nright;
int h;
int y;
int dy, dx;
GdkColor pixel;
double LRemain;
double r;
double rdx, rdy;
double dashDx, dashDy;
double saveK = 0.0;
gboolean first = TRUE;
double lcenterx, lcentery, rcenterx = 0.0, rcentery = 0.0;
GdkColor fgPixel, bgPixel;
dx = x2 - x1;
dy = y2 - y1;
dashIndex = *pDashIndex;
pDash = GDK_GC_FBDATA(pGC)->dash_list;
dashRemain = pDash[dashIndex] - *pDashOffset;
fgPixel = GDK_GC_FBDATA(pGC)->values.foreground;
bgPixel = GDK_GC_FBDATA(pGC)->values.background;
if (GDK_GC_FBDATA(pGC)->values.fill == GDK_OPAQUE_STIPPLED ||
GDK_GC_FBDATA(pGC)->values.fill == GDK_TILED)
{
bgPixel = fgPixel;
}
l = ((double) GDK_GC_FBDATA(pGC)->values.line_width) / 2.0;
if (dx == 0)
{
L = dy;
rdx = 0;
rdy = l;
if (dy < 0)
{
L = -dy;
rdy = -l;
}
}
else if (dy == 0)
{
L = dx;
rdx = l;
rdy = 0;
if (dx < 0)
{
L = -dx;
rdx = -l;
}
}
else
{
L = hypot ((double) dx, (double) dy);
r = l / L;
rdx = r * dx;
rdy = r * dy;
}
k = l * L;
LRemain = L;
/* All position comments are relative to a line with dx and dy > 0,
* but the code does not depend on this */
/* top */
slopes[V_TOP].dx = dx;
slopes[V_TOP].dy = dy;
slopes[V_TOP].k = k;
/* right */
slopes[V_RIGHT].dx = -dy;
slopes[V_RIGHT].dy = dx;
slopes[V_RIGHT].k = 0;
/* bottom */
slopes[V_BOTTOM].dx = -dx;
slopes[V_BOTTOM].dy = -dy;
slopes[V_BOTTOM].k = k;
/* left */
slopes[V_LEFT].dx = dy;
slopes[V_LEFT].dy = -dx;
slopes[V_LEFT].k = 0;
/* preload the start coordinates */
vertices[V_RIGHT].x = vertices[V_TOP].x = rdy;
vertices[V_RIGHT].y = vertices[V_TOP].y = -rdx;
vertices[V_BOTTOM].x = vertices[V_LEFT].x = -rdy;
vertices[V_BOTTOM].y = vertices[V_LEFT].y = rdx;
if (projectLeft)
{
vertices[V_TOP].x -= rdx;
vertices[V_TOP].y -= rdy;
vertices[V_LEFT].x -= rdx;
vertices[V_LEFT].y -= rdy;
slopes[V_LEFT].k = rdx * dx + rdy * dy;
}
lcenterx = x1;
lcentery = y1;
if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
{
lcapFace.dx = dx;
lcapFace.dy = dy;
lcapFace.x = x1;
lcapFace.y = y1;
rcapFace.dx = -dx;
rcapFace.dy = -dy;
rcapFace.x = x1;
rcapFace.y = y1;
}
while (LRemain > dashRemain)
{
dashDx = (dashRemain * dx) / L;
dashDy = (dashRemain * dy) / L;
rcenterx = lcenterx + dashDx;
rcentery = lcentery + dashDy;
vertices[V_RIGHT].x += dashDx;
vertices[V_RIGHT].y += dashDy;
vertices[V_BOTTOM].x += dashDx;
vertices[V_BOTTOM].y += dashDy;
slopes[V_RIGHT].k = vertices[V_RIGHT].x * dx + vertices[V_RIGHT].y * dy;
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH || !(dashIndex & 1))
{
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_ON_OFF_DASH &&
GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING)
{
saveRight = vertices[V_RIGHT];
saveBottom = vertices[V_BOTTOM];
saveK = slopes[V_RIGHT].k;
if (!first)
{
vertices[V_TOP].x -= rdx;
vertices[V_TOP].y -= rdy;
vertices[V_LEFT].x -= rdx;
vertices[V_LEFT].y -= rdy;
slopes[V_LEFT].k = vertices[V_LEFT].x *
slopes[V_LEFT].dy -
vertices[V_LEFT].y *
slopes[V_LEFT].dx;
}
vertices[V_RIGHT].x += rdx;
vertices[V_RIGHT].y += rdy;
vertices[V_BOTTOM].x += rdx;
vertices[V_BOTTOM].y += rdy;
slopes[V_RIGHT].k = vertices[V_RIGHT].x *
slopes[V_RIGHT].dy -
vertices[V_RIGHT].y *
slopes[V_RIGHT].dx;
}
y = miPolyBuildPoly (vertices, slopes, 4, x1, y1,
left, right, &nleft, &nright, &h);
pixel = (dashIndex & 1) ? bgPixel : fgPixel;
miFillPolyHelper (pDrawable, pGC, &pixel, spanData, y, h, left, right, nleft, nright);
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_ON_OFF_DASH)
{
switch (GDK_GC_FBDATA(pGC)->values.cap_style)
{
case GDK_CAP_PROJECTING:
vertices[V_BOTTOM] = saveBottom;
vertices[V_RIGHT] = saveRight;
slopes[V_RIGHT].k = saveK;
break;
case GDK_CAP_ROUND:
if (!first)
{
if (dx < 0)
{
lcapFace.xa = -vertices[V_LEFT].x;
lcapFace.ya = -vertices[V_LEFT].y;
lcapFace.k = slopes[V_LEFT].k;
}
else
{
lcapFace.xa = vertices[V_TOP].x;
lcapFace.ya = vertices[V_TOP].y;
lcapFace.k = -slopes[V_LEFT].k;
}
miLineArc (pDrawable, pGC, &pixel, spanData,
&lcapFace, (LineFacePtr) NULL,
lcenterx, lcentery, FALSE);
}
if (dx < 0)
{
rcapFace.xa = vertices[V_BOTTOM].x;
rcapFace.ya = vertices[V_BOTTOM].y;
rcapFace.k = slopes[V_RIGHT].k;
}
else
{
rcapFace.xa = -vertices[V_RIGHT].x;
rcapFace.ya = -vertices[V_RIGHT].y;
rcapFace.k = -slopes[V_RIGHT].k;
}
miLineArc (pDrawable, pGC, &pixel, spanData,
(LineFacePtr) NULL, &rcapFace,
rcenterx, rcentery, FALSE);
break;
default:
break;
}
}
}
LRemain -= dashRemain;
++dashIndex;
if (dashIndex == GDK_GC_FBDATA(pGC)->dash_list_len)
dashIndex = 0;
dashRemain = pDash[dashIndex];
lcenterx = rcenterx;
lcentery = rcentery;
vertices[V_TOP] = vertices[V_RIGHT];
vertices[V_LEFT] = vertices[V_BOTTOM];
slopes[V_LEFT].k = -slopes[V_RIGHT].k;
first = FALSE;
}
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH || !(dashIndex & 1))
{
vertices[V_TOP].x -= dx;
vertices[V_TOP].y -= dy;
vertices[V_LEFT].x -= dx;
vertices[V_LEFT].y -= dy;
vertices[V_RIGHT].x = rdy;
vertices[V_RIGHT].y = -rdx;
vertices[V_BOTTOM].x = -rdy;
vertices[V_BOTTOM].y = rdx;
if (projectRight)
{
vertices[V_RIGHT].x += rdx;
vertices[V_RIGHT].y += rdy;
vertices[V_BOTTOM].x += rdx;
vertices[V_BOTTOM].y += rdy;
slopes[V_RIGHT].k = vertices[V_RIGHT].x *
slopes[V_RIGHT].dy -
vertices[V_RIGHT].y *
slopes[V_RIGHT].dx;
}
else
slopes[V_RIGHT].k = 0;
if (!first && GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_ON_OFF_DASH &&
GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING)
{
vertices[V_TOP].x -= rdx;
vertices[V_TOP].y -= rdy;
vertices[V_LEFT].x -= rdx;
vertices[V_LEFT].y -= rdy;
slopes[V_LEFT].k = vertices[V_LEFT].x *
slopes[V_LEFT].dy -
vertices[V_LEFT].y *
slopes[V_LEFT].dx;
}
else
slopes[V_LEFT].k += dx * dx + dy * dy;
y = miPolyBuildPoly (vertices, slopes, 4, x2, y2,
left, right, &nleft, &nright, &h);
pixel = (dashIndex & 1) ? GDK_GC_FBDATA(pGC)->values.background : GDK_GC_FBDATA(pGC)->values.foreground;
miFillPolyHelper (pDrawable, pGC, &pixel, spanData, y, h, left, right, nleft, nright);
if (!first && GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_ON_OFF_DASH &&
GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
{
lcapFace.x = x2;
lcapFace.y = y2;
if (dx < 0)
{
lcapFace.xa = -vertices[V_LEFT].x;
lcapFace.ya = -vertices[V_LEFT].y;
lcapFace.k = slopes[V_LEFT].k;
}
else
{
lcapFace.xa = vertices[V_TOP].x;
lcapFace.ya = vertices[V_TOP].y;
lcapFace.k = -slopes[V_LEFT].k;
}
miLineArc (pDrawable, pGC, &pixel, spanData,
&lcapFace, (LineFacePtr) NULL,
rcenterx, rcentery, FALSE);
}
}
dashRemain = ((double) dashRemain) - LRemain;
if (dashRemain == 0)
{
dashIndex++;
if (dashIndex == GDK_GC_FBDATA(pGC)->dash_list_len)
dashIndex = 0;
dashRemain = pDash[dashIndex];
}
leftFace->x = x1;
leftFace->y = y1;
leftFace->dx = dx;
leftFace->dy = dy;
leftFace->xa = rdy;
leftFace->ya = -rdx;
leftFace->k = k;
rightFace->x = x2;
rightFace->y = y2;
rightFace->dx = -dx;
rightFace->dy = -dy;
rightFace->xa = -rdy;
rightFace->ya = rdx;
rightFace->k = k;
*pDashIndex = dashIndex;
*pDashOffset = pDash[dashIndex] - dashRemain;
}
void
miWideDash (pDrawable, pGC, mode, npt, pPts)
GdkDrawable* pDrawable;
register GdkGC* pGC;
int mode;
register int npt;
register GdkPoint* pPts;
{
int x1, y1, x2, y2;
GdkColor pixel;
gboolean projectLeft, projectRight;
LineFaceRec leftFace, rightFace, prevRightFace;
LineFaceRec firstFace;
int first;
int dashIndex, dashOffset;
register int prevDashIndex;
SpanDataRec spanDataRec;
SpanDataPtr spanData;
gboolean somethingDrawn = FALSE;
gboolean selfJoin;
gboolean endIsFg = FALSE, startIsFg = FALSE;
gboolean firstIsFg = FALSE, prevIsFg = FALSE;
#ifndef XFree86Server
/* XXX backward compatibility */
if (GDK_GC_FBDATA(pGC)->values.line_width == 0)
{
miZeroDashLine (pDrawable, pGC, mode, npt, pPts);
return;
}
#endif
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH &&
(GDK_GC_FBDATA(pGC)->values.fill == GDK_OPAQUE_STIPPLED || GDK_GC_FBDATA(pGC)->values.fill == GDK_TILED))
{
miWideLine (pDrawable, pGC, mode, npt, pPts);
return;
}
if (npt == 0)
return;
spanData = miSetupSpanData (pGC, &spanDataRec, npt);
x2 = pPts->x;
y2 = pPts->y;
first = TRUE;
selfJoin = FALSE;
if (0 /* mode == CoordModePrevious */)
{
int nptTmp;
GdkPoint* pPtsTmp;
x1 = x2;
y1 = y2;
nptTmp = npt;
pPtsTmp = pPts + 1;
while (--nptTmp)
{
x1 += pPtsTmp->x;
y1 += pPtsTmp->y;
++pPtsTmp;
}
if (x2 == x1 && y2 == y1)
selfJoin = TRUE;
}
else if (x2 == pPts[npt-1].x && y2 == pPts[npt-1].y)
{
selfJoin = TRUE;
}
projectLeft = GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING && !selfJoin;
projectRight = FALSE;
dashIndex = 0;
dashOffset = 0;
miStepDash (GDK_GC_FBDATA(pGC)->dash_offset, &dashIndex,
GDK_GC_FBDATA(pGC)->dash_list, (int)GDK_GC_FBDATA(pGC)->dash_list_len, &dashOffset);
while (--npt)
{
x1 = x2;
y1 = y2;
++pPts;
x2 = pPts->x;
y2 = pPts->y;
if (0 /* mode == CoordModePrevious */)
{
x2 += x1;
y2 += y1;
}
if (x1 != x2 || y1 != y2)
{
somethingDrawn = TRUE;
if (npt == 1 && GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING &&
(!selfJoin || !firstIsFg))
projectRight = TRUE;
prevDashIndex = dashIndex;
miWideDashSegment (pDrawable, pGC, spanData, &dashOffset, &dashIndex,
x1, y1, x2, y2,
projectLeft, projectRight, &leftFace, &rightFace);
startIsFg = !(prevDashIndex & 1);
endIsFg = (dashIndex & 1) ^ (dashOffset != 0);
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH || startIsFg)
{
pixel = startIsFg ? GDK_GC_FBDATA(pGC)->values.foreground : GDK_GC_FBDATA(pGC)->values.background;
if (first || (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_ON_OFF_DASH && !prevIsFg))
{
if (first && selfJoin)
{
firstFace = leftFace;
firstIsFg = startIsFg;
}
else if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
miLineArc (pDrawable, pGC, &pixel, spanData,
&leftFace, (LineFacePtr) NULL,
(double)0.0, (double)0.0, TRUE);
}
else
{
miLineJoin (pDrawable, pGC, &pixel, spanData, &leftFace,
&prevRightFace);
}
}
prevRightFace = rightFace;
prevIsFg = endIsFg;
first = FALSE;
projectLeft = FALSE;
}
if (npt == 1 && somethingDrawn)
{
if (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH || endIsFg)
{
pixel = endIsFg ? GDK_GC_FBDATA(pGC)->values.foreground : GDK_GC_FBDATA(pGC)->values.background;
if (selfJoin && (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH || firstIsFg))
{
miLineJoin (pDrawable, pGC, &pixel, spanData, &firstFace,
&rightFace);
}
else
{
if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
miLineArc (pDrawable, pGC, &pixel, spanData,
(LineFacePtr) NULL, &rightFace,
(double)0.0, (double)0.0, TRUE);
}
}
else
{
/* glue a cap to the start of the line if
* we're OnOffDash and ended on odd dash
*/
if (selfJoin && firstIsFg)
{
pixel = GDK_GC_FBDATA(pGC)->values.foreground;
if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_PROJECTING)
miLineProjectingCap (pDrawable, pGC, &pixel, spanData,
&firstFace, TRUE,
(double)0.0, (double)0.0, TRUE);
else if (GDK_GC_FBDATA(pGC)->values.cap_style == GDK_CAP_ROUND)
miLineArc (pDrawable, pGC, &pixel, spanData,
&firstFace, (LineFacePtr) NULL,
(double)0.0, (double)0.0, TRUE);
}
}
}
}
/* handle crock where all points are coincident */
if (!somethingDrawn && (GDK_GC_FBDATA(pGC)->values.line_style == GDK_LINE_DOUBLE_DASH || !(dashIndex & 1)))
{
/* not the same as endIsFg computation above */
pixel = (dashIndex & 1) ? GDK_GC_FBDATA(pGC)->values.background : GDK_GC_FBDATA(pGC)->values.foreground;
switch (GDK_GC_FBDATA(pGC)->values.cap_style) {
case GDK_CAP_ROUND:
miLineArc (pDrawable, pGC, &pixel, spanData,
(LineFacePtr) NULL, (LineFacePtr) NULL,
(double)x2, (double)y2,
FALSE);
break;
case GDK_CAP_PROJECTING:
x1 = GDK_GC_FBDATA(pGC)->values.line_width;
miFillRectPolyHelper (pDrawable, pGC, &pixel, spanData,
x2 - (x1 >> 1), y2 - (x1 >> 1), x1, x1);
break;
default:
break;
}
}
if (spanData)
miCleanupSpanData (pDrawable, pGC, spanData);
}
/* these are stubs to allow old ddx miValidateGCs to work without change */
void
miMiter()
{
}
void
miNotMiter()
{
}