void
GxExpose(Engine *engine, Drauing *drawing, int *xy)
{
XEngine *xeng = (XEngine *)engine;
GpBox damage;
if (!drawing || !xeng->w) return;
/* xy=0 to redraw all, otherwise x0,y0,x1,y1 */
if (xy) {
GpXYMap *map = &engine->devMap;
damage.xmin= (xy[0]-map->x.offset)/map->x.scale;
damage.xmax= (xy[2]-map->x.offset)/map->x.scale;
damage.ymax= (xy[1]-map->y.offset)/map->y.scale;
damage.ymin= (xy[3]-map->y.offset)/map->y.scale;
} else {
damage.xmin = xeng->swapped.viewport.xmin;
damage.xmax = xeng->swapped.viewport.xmax;
damage.ymin = xeng->swapped.viewport.ymin;
damage.ymax = xeng->swapped.viewport.ymax;
}
if (engine->damaged) {
GpSwallow(&engine->damage, &damage);
} else {
engine->damage = damage;
engine->damaged = 1;
}
GdSetDrawing(drawing);
GpPreempt(engine);
GdDraw(1);
GpPreempt(0); /* not correct if damaged during a preempt... */
GdSetDrawing(0);
}
int GhSetPlotter(int number)
{
if (number<0 || number>=GH_NDEVS) return 1;
if (currentDevice>=0) {
if (ghDevices[currentDevice].display) {
GdSetDrawing(ghDevices[currentDevice].drawing);
GhBeforeWait();
GpDeactivate(ghDevices[currentDevice].display);
}
if (ghDevices[currentDevice].hcp)
GpDeactivate(ghDevices[currentDevice].hcp);
}
if (hcpDefault) GpDeactivate(hcpDefault);
currentDevice= number;
if (ghDevices[number].display) GpActivate(ghDevices[number].display);
return GdSetDrawing(ghDevices[number].drawing);
}
