#include <memory.h>
#include <math.h>
#include "../mem.h"
+#include "../types.h"
#include "../q.h"
#include "poly.h"
#include "active.h"
#include "xrow.h"
+#include "wind.h"
//#define DEBUG
//#undef assert
typedef struct _status {
int y;
+ int num_polygons;
actlist_t*actlist;
heap_t*queue;
edge_t*output;
xrow_t*xrow;
+ windrule_t*windrule;
#ifdef DEBUG
dict_t*seen_crossings; //list of crossing we saw so far
dict_t*intersecting_segs; //list of segments intersecting in this scanline
return 0;
}
-gfxpoly_t* gfxpoly_new()
+gfxpoly_t* gfxpoly_new(double gridsize)
{
- return 0;
+ gfxpoly_t*p = (gfxpoly_t*)rfx_calloc(sizeof(gfxpoly_t));
+ p->gridsize = gridsize;
+ return p;
}
void gfxpoly_destroy(gfxpoly_t*poly)
{
- edge_t* s = poly;
+ edge_t* s = poly->edges;
while(s) {
edge_t*next = s->next;
free(s);
s = next;
}
+ free(poly);
+}
+char gfxpoly_check(gfxpoly_t*poly)
+{
+ edge_t* s = poly->edges;
+ dict_t*d = dict_new2(&point_type);
+ while(s) {
+ if(!dict_contains(d, &s->a)) {
+ dict_put(d, &s->a, (void*)(ptroff_t)1);
+ } else {
+ int count = (ptroff_t)dict_lookup(d, &s->a);
+ dict_del(d, &s->a);
+ count++;
+ dict_put(d, &s->a, (void*)(ptroff_t)count);
+ }
+ if(!dict_contains(d, &s->b)) {
+ dict_put(d, &s->b, (void*)(ptroff_t)1);
+ } else {
+ int count = (ptroff_t)dict_lookup(d, &s->b);
+ dict_del(d, &s->b);
+ count++;
+ dict_put(d, &s->b, (void*)(ptroff_t)count);
+ }
+ s = s->next;
+ }
+ DICT_ITERATE_ITEMS(d, point_t*, p, void*, c) {
+ int count = (ptroff_t)c;
+ if(count&1) {
+ fprintf(stderr, "Point (%f,%f) occurs %d times\n", p->x*poly->gridsize, p->y*poly->gridsize, count);
+ return 0;
+ }
+ }
+ return 1;
}
void gfxpoly_dump(gfxpoly_t*poly)
{
- edge_t* s = (edge_t*)poly;
+ edge_t* s = poly->edges;
+ double g = poly->gridsize;
while(s) {
- fprintf(stderr, "(%d,%d) -> (%d,%d)\n", s->a.x, s->a.y, s->b.x, s->b.y);
+ fprintf(stderr, "(%f,%f) -> (%f,%f)\n", s->a.x*g, s->a.y*g, s->b.x*g, s->b.y*g);
s = s->next;
}
}
static inline max32(int32_t v1, int32_t v2) {return v1>v2?v1:v2;}
static inline min32(int32_t v1, int32_t v2) {return v1<v2?v1:v2;}
-void segment_init(segment_t*s, int x1, int y1, int x2, int y2)
+void segment_init(segment_t*s, int x1, int y1, int x2, int y2, windstate_t windstate, int polygon_nr)
{
if(y1<y2) {
s->dir = DIR_DOWN;
s->delta.x = x2-x1;
s->delta.y = y2-y1;
s->pos = s->a;
- s->new_point.y = y1-1;
+ s->polygon_nr = polygon_nr;
#define XDEBUG
#ifdef XDEBUG
static int segment_count=0;
dict_init2(&s->scheduled_crossings, &ptr_type, 0);
}
-segment_t* segment_new(int32_t x1, int32_t y1, int32_t x2, int32_t y2)
+segment_t* segment_new(int32_t x1, int32_t y1, int32_t x2, int32_t y2, windstate_t initial, int polygon_nr)
{
segment_t*s = (segment_t*)rfx_calloc(sizeof(segment_t));
- segment_init(s, x1, y1, x2, y2);
+ segment_init(s, x1, y1, x2, y2, initial, polygon_nr);
return s;
}
void segment_destroy(segment_t*s)
free(s);
}
-void gfxpoly_enqueue(edge_t*list, heap_t*queue)
+void gfxpoly_enqueue(edge_t*list, heap_t*queue, windstate_t initial, int polygon_nr)
{
edge_t*l;
for(l=list;l;l=l->next) {
fprintf(stderr, "Warning: intersector input contains zero-length segments\n");
continue;
}
- segment_t*s = segment_new(l->a.x, l->a.y, l->b.x, l->b.y);
+ segment_t*s = segment_new(l->a.x, l->a.y, l->b.x, l->b.y, initial, polygon_nr);
#ifdef DEBUG
fprintf(stderr, "[%d] (%d,%d) -> (%d,%d) %s\n",
s->nr, s->a.x, s->a.y, s->b.x, s->b.y,
return box;
}
-void insert_point_into_segment(status_t*status, segment_t*s, point_t p)
-{
- edge_t*e = malloc(sizeof(edge_t));
- e->a = s->pos;
- e->b = p;
- assert(e->a.y != e->b.y);
- e->next = status->output;
- status->output = e;
-}
-void mark_point_in_segment(status_t*status, segment_t*s, point_t p)
+static void insert_point_into_segment(status_t*status, segment_t*s, point_t p)
{
-#ifdef DEBUG
- if(s->pos.x == p.x && s->pos.y == p.y) {
- fprintf(stderr, "Error: tried to add (%d,%d) to segment [%d] twice\n", p.x, p.y, s->nr);
- }
-#endif
assert(s->pos.x != p.x || s->pos.y != p.y);
+
#ifdef DEBUG
- fprintf(stderr, "[%d] gets extra point (%d,%d)\n", s->nr, p.x, p.y);
if(!dict_contains(status->segs_with_point, s))
dict_put(status->segs_with_point, s, 0);
#endif
- if(s->new_point.y != p.y) {
- s->new_point = p;
+
+ assert(s->fs_out_ok);
+ if(s->fs_out) {
+#ifdef DEBUG
+ fprintf(stderr, "[%d] receives next point (%d,%d) (drawing)\n", s->nr, p.x, p.y);
+#endif
+ // omit horizontal lines
+ if(s->pos.y != p.y) {
+ edge_t*e = malloc(sizeof(edge_t));
+ e->a = s->pos;
+ e->b = p;
+ assert(e->a.y != e->b.y);
+ e->next = status->output;
+ status->output = e;
+ }
+ } else {
+#ifdef DEBUG
+ fprintf(stderr, "[%d] receives next point (%d,%d) (omitting)\n", s->nr, p.x, p.y);
+#endif
}
- s->new_pos = p;
+ s->pos = p;
}
/* possible optimizations:
I \ I \ -------
+ \ + \
*/
-static void mark_points_in_positively_sloped_segments(status_t*status, int32_t y)
+static void add_points_to_positively_sloped_segments(status_t*status, int32_t y)
{
int t;
for(t=0;t<status->xrow->num;t++) {
double d1 = LINE_EQ(box.right1, seg);
double d2 = LINE_EQ(box.right2, seg);
if(d1>=0 || d2>=0) {
- mark_point_in_segment(status, seg, box.right2);
+ insert_point_into_segment(status, seg, box.right2);
} else {
break;
}
| I | /I /
| /+ |/ + /
*/
-static void mark_points_in_negatively_sloped_segments(status_t*status, int32_t y)
+static void add_points_to_negatively_sloped_segments(status_t*status, int32_t y)
{
int t;
for(t=status->xrow->num-1;t>=0;t--) {
double d1 = LINE_EQ(box.left1, seg);
double d2 = LINE_EQ(box.left2, seg);
if(d1<0 || d2<0) {
- mark_point_in_segment(status, seg, box.right2);
+ insert_point_into_segment(status, seg, box.right2);
} else {
break;
}
}
}
-static void add_points(status_t*status)
+static void recalculate_windings(status_t*status)
{
/* TODO: we could use some clever second linked list structure so that we
- only need to process points which we know we marked */
- int t;
+ only need to process points we know we marked */
+
segment_t*s = actlist_leftmost(status->actlist);
+ segment_t*last = 0;
while(s) {
- if(s->new_point.y == status->y) {
- insert_point_into_segment(status, s, s->new_point);
- s->pos = s->new_pos;
- }
+ windstate_t wind = last?last->wind:status->windrule->start(status->num_polygons);
+ s->wind = status->windrule->add(wind, s->fs, s->dir, s->polygon_nr);
+ s->fs_out = status->windrule->diff(&wind, &s->wind);
+ s->fs_out_ok = 1;
+#ifdef DEBUG
+ fprintf(stderr, "[%d] %s/%d/%s/%s ", s->nr, s->dir==DIR_UP?"up":"down", s->wind.wind_nr, s->wind.is_filled?"fill":"nofill", s->fs_out?"draw":"omit");
+#endif
+ last = s;
s = actlist_right(status->actlist, s);
}
+#ifdef DEBUG
+ fprintf(stderr, "\n");
+#endif
+
}
void intersect_with_horizontal(status_t*status, segment_t*h)
schedule_crossing(status, left, s);
if(right)
schedule_crossing(status, s, right);
-
schedule_endpoint(status, e->s1);
break;
}
case EVENT_CROSS: {
- // exchange two (or more) segments
+ // exchange two segments
+#ifdef DEBUG
+ event_dump(e);
+#endif
if(actlist_right(status->actlist, e->s1) == e->s2 &&
actlist_left(status->actlist, e->s2) == e->s1) {
exchange_two(status, e);
}
#endif
-edge_t* gfxpoly_process(edge_t*poly)
+gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule)
{
heap_t* queue = heap_new(sizeof(event_t), compare_events);
- gfxpoly_enqueue(poly, queue);
+
+ gfxpoly_enqueue(poly->edges, queue, windrule->start(1), /*polygon nr*/0);
+
status_t status;
memset(&status, 0, sizeof(status_t));
+ status.num_polygons = 1;
status.queue = queue;
+ status.windrule = windrule;
status.actlist = actlist_new();
#ifdef DEBUG
status.seen_crossings = dict_new2(&point_type);
- gfxpoly_dump(poly);
#endif
status.xrow = xrow_new();
} while(e && status.y == e->p.y);
xrow_sort(status.xrow);
- mark_points_in_positively_sloped_segments(&status, status.y);
- mark_points_in_negatively_sloped_segments(&status, status.y);
- add_points(&status);
+ add_points_to_positively_sloped_segments(&status, status.y);
+ add_points_to_negatively_sloped_segments(&status, status.y);
+ recalculate_windings(&status);
#ifdef DEBUG
check_status(&status);
dict_destroy(status.intersecting_segs);
heap_destroy(queue);
xrow_destroy(status.xrow);
- return status.output;
+ gfxpoly_t*p = gfxpoly_new(poly->gridsize);
+ p->edges = status.output;
+ return p;
}
git.asbjorn.biz / swftools.git / blobdiff