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#include <Vlib.h>
void
VdbeExposeBuffer(Viewport * v, GC gc)
{
XdbeSwapInfo si;
si.swap_window = v->win;
si.swap_action = XdbeUntouched;
XdbeSwapBuffers ( v->dpy, &si, 1 );
v->lastPixel = 0xffffffff;
}
void
VdbeDrawLine(Viewport *v, int x1, int y1, int x2, int y2,
Color color)
{
Drawable d;
d = (Drawable) v->dbeDrawable;
if (color != v->lastPixel) {
XSetForeground (v->dpy, v->gc, color);
v->lastPixel = color;
}
XDrawLine (v->dpy, d, v->gc, x1, y1, x2, y2);
}
void
VdbeFillRectangle(Viewport *v,
int x, int y, int w, int h, Color color)
{
Drawable d;
if (color != UnchangedColor) {
d = (Drawable) v->dbeDrawable;
if (color != v->lastPixel) {
XSetForeground (v->dpy, v->gc, color);
v->lastPixel = color;
}
XFillRectangle(v->dpy, d, v->gc, x, y, w, h);
}
}
void
VdbeDrawSegments(Viewport * v, Segment * seg, int nseg, Color color)
{
int i;
Drawable d;
Display *dpy = v->dpy;
GC gc = v->gc;
if ( nseg > 1024 ) {
printf("nseg > 1024; only the first 1024 will be used.\n");
nseg = 1024;
}
d = (Drawable) v->dbeDrawable;
if (color != v->lastPixel) {
XSetForeground (dpy, gc, color);
v->lastPixel = color;
}
XDrawSegments (dpy, d, gc, seg, nseg);
}
void
VdbeFillPolygon(Viewport * v, Window win, GC gc, VPolygon * poly)
{
VPoint *p;
XPoint xpt[VmaxVP], *lastpt;
register int i, k;
Drawable d;
Color c;
Display *dpy = v->dpy;
GC xgc = v->gc;
d = (Drawable) v->dbeDrawable;
if (poly == (VPolygon *) NULL)
return;
k = 0;
lastpt = &xpt[0];
c = VComputePolygonColor(v, poly);
if (c != v->lastPixel) {
XSetForeground (dpy, xgc, c);
v->lastPixel = c;
}
for ((i = 0, p = poly->vertex); i < poly->numVtces; (++i, ++p)) {
if (v->flags & VPPerspective && p->z != 0.0) {
xpt[k].x = (v->Middl.x + (int) (v->Scale.x * p->x / p->z)) >> 2;
xpt[k].y = (v->Middl.y - (int) (v->Scale.y * p->y / p->z)) >> 2;
}
else {
xpt[k].x = (v->Middl.x + (int) (v->Scale.x * p->x)) >> 2;
xpt[k].y = (v->Middl.y - (int) (v->Scale.y * p->y)) >> 2;
}
#ifdef COLLAPSEUNUSEDPOINTS
if (k == 0 || !(xpt[k].x == lastpt->x && xpt[k].y == lastpt->y))
lastpt = &xpt[k++];
#else
++k;
#endif
}
if (k > 0) {
#ifdef COLLAPSEUNUSEDPOINTS
if (k == 1) {
XDrawPoint(dpy, d, xgc, xpt[0].x, xpt[0].y);
}
else if (k == 2) {
XDrawLine(dpy, d, xgc, xpt[0].x, xpt[0].y,
xpt[1].x, xpt[1].y);
}
else
#endif
XFillPolygon(dpy, d, xgc, xpt, k, Convex, CoordModeOrigin);
}
}
void
VdbeSetClipRect(Viewport *v, int x1, int y1,
int x2, int y2)
{
XRectangle rect[1];
if (x2 == -1 && y2 == -1) {
XSetClipMask(v->dpy, v->gc, None);
}
else {
rect[0].x = x1;
rect[0].y = y1;
rect[0].width = x2 - x1 + 1;
rect[0].height = y2 - y1 + 1;
XSetClipRectangles(v->dpy, v->gc, 0,
0, rect, 1, YXBanded);
}
}
void
VdbeClose(Viewport *v)
{
}
Status
VdbeAllocColor(Viewport *v, Colormap colormap, XColor *c)
{
Status result;
result = XAllocColor (v->dpy, colormap, c);
return result;
}
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