X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=lib%2Fgfxpoly%2Fpoly.c;h=7eb6509c62c745f1a9a09db2b8aeeda2342d91d7;hp=7036a61b59ad0dd5192d1f81c88dc48ae7979232;hb=83aa304f14f03d1a214817fa3af43dda74436415;hpb=f7e9e8a9616f1ecb26776369fda6807cf8821a68 diff --git a/lib/gfxpoly/poly.c b/lib/gfxpoly/poly.c index 7036a61..7eb6509 100644 --- a/lib/gfxpoly/poly.c +++ b/lib/gfxpoly/poly.c @@ -3,27 +3,31 @@ #include #include "../mem.h" #include "../types.h" -#include "../q.h" #include "../MD5.h" #include "poly.h" #include "active.h" #include "xrow.h" #include "wind.h" +#include "convert.h" +#include "heap.h" static gfxpoly_t*current_polygon = 0; void gfxpoly_fail(char*expr, char*file, int line, const char*function) { - if(!current_polygon) {fprintf(stderr, "error outside polygon\n");exit(1);} + if(!current_polygon) { + fprintf(stderr, "assert(%s) failed in %s in line %d: %s\n", expr, file, line, function); + exit(1); + } - void*md5 = init_md5(); - - edge_t* s = current_polygon->edges; - while(s) { - update_md5(md5, (unsigned char*)&s->a.x, sizeof(s->a.x)); - update_md5(md5, (unsigned char*)&s->a.y, sizeof(s->a.y)); - update_md5(md5, (unsigned char*)&s->b.x, sizeof(s->b.x)); - update_md5(md5, (unsigned char*)&s->b.y, sizeof(s->b.y)); - s = s->next; + void*md5 = initialize_md5(); + + int s,t; + gfxpolystroke_t*stroke = current_polygon->strokes; + for(;stroke;stroke=stroke->next) { + for(t=0;tnum_points;t++) { + update_md5(md5, (unsigned char*)&stroke->points[t].x, sizeof(stroke->points[t].x)); + update_md5(md5, (unsigned char*)&stroke->points[t].y, sizeof(stroke->points[t].y)); + } } unsigned char h[16]; char filename[32+4+1]; @@ -64,33 +68,24 @@ static void point_free(void*o) p->y = 0; free(p); } -static type_t point_type = { +type_t point_type = { equals: point_equals, hash: point_hash, dup: point_dup, free: point_free, }; -typedef struct _status { - int32_t y; - actlist_t*actlist; - heap_t*queue; - edge_t*output; - xrow_t*xrow; - windrule_t*windrule; - windcontext_t*context; - segment_t*ending_segments; -#ifdef CHECKS - dict_t*seen_crossings; //list of crossing we saw so far - dict_t*intersecting_segs; //list of segments intersecting in this scanline - dict_t*segs_with_point; //lists of segments that received a point in this scanline -#endif -} status_t; +typedef struct _event { + eventtype_t type; + point_t p; + segment_t*s1; + segment_t*s2; +} event_t; /* compare_events_simple differs from compare_events in that it schedules events from left to right regardless of type. It's only used in horizontal processing, in order to get an x-wise sorting of the current scanline */ -static int compare_events_simple(const void*_a,const void*_b) +static inline int compare_events_simple(const void*_a,const void*_b) { event_t* a = (event_t*)_a; event_t* b = (event_t*)_b; @@ -101,7 +96,7 @@ static int compare_events_simple(const void*_a,const void*_b) return 0; } -static int compare_events(const void*_a,const void*_b) +static inline int compare_events(const void*_a,const void*_b) { event_t* a = (event_t*)_a; event_t* b = (event_t*)_b; @@ -110,72 +105,98 @@ static int compare_events(const void*_a,const void*_b) /* we need to schedule end after intersect (so that a segment about to end has a chance to tear up a few other segs first) and start events after end (in order not to confuse the intersection check, which - assumes there's an actual y overlap between active segments)). + assumes there's an actual y overlap between active segments, and + because ending segments in the active list make it difficult to insert + starting segments at the right position)). Horizontal lines come last, because the only purpose they have is to create snapping coordinates for the segments (still) existing in this scanline. */ d = b->type - a->type; if(d) return d; - d = b->p.x - a->p.x; - return d; -} + return 0; -gfxpoly_t* gfxpoly_new(double gridsize) -{ - gfxpoly_t*p = (gfxpoly_t*)rfx_calloc(sizeof(gfxpoly_t)); - p->gridsize = gridsize; - return p; + /* I don't see any reason why we would need to order by x- at least as long + as we do horizontal lines in a seperate pass */ + //d = b->p.x - a->p.x; + //return d; } -void gfxpoly_destroy(gfxpoly_t*poly) + +#define COMPARE_EVENTS(x,y) (compare_events(x,y)>0) +#define COMPARE_EVENTS_SIMPLE(x,y) (compare_events_simple(x,y)>0) +HEAP_DEFINE(queue,event_t,COMPARE_EVENTS); +HEAP_DEFINE(hqueue,event_t,COMPARE_EVENTS_SIMPLE); + +typedef struct _status { + int32_t y; + actlist_t*actlist; + queue_t queue; + xrow_t*xrow; + windrule_t*windrule; + windcontext_t*context; + segment_t*ending_segments; + + gfxpolystroke_t*strokes; +#ifdef CHECKS + dict_t*seen_crossings; //list of crossing we saw so far + dict_t*intersecting_segs; //list of segments intersecting in this scanline + dict_t*segs_with_point; //lists of segments that received a point in this scanline +#endif +} status_t; + + +int gfxpoly_num_segments(gfxpoly_t*poly) { - edge_t* s = poly->edges; - while(s) { - edge_t*next = s->next; - free(s); - s = next; + gfxpolystroke_t*stroke = poly->strokes; + int count = 0; + for(;stroke;stroke=stroke->next) { + count++; } - free(poly); + return count; } int gfxpoly_size(gfxpoly_t*poly) { - edge_t* s = poly->edges; - int t=0; - while(s) { - s = s->next;t++; + int s,t; + int edges = 0; + gfxpolystroke_t*stroke = poly->strokes; + for(;stroke;stroke=stroke->next) { + edges += stroke->num_points-1; } - return t; + return edges; } char gfxpoly_check(gfxpoly_t*poly) { - edge_t* s = poly->edges; + current_polygon = poly; 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; + int s,t; + gfxpolystroke_t*stroke = poly->strokes; + for(;stroke;stroke=stroke->next) { + /* In order to not confuse the fill/wind logic, existing segments must have + a non-zero edge style */ + assert(stroke->fs); + + /* put all the segments into dictionaries so that we can check + that the endpoint multiplicity is two */ + for(s=0;snum_points;s++) { + point_t p = stroke->points[s]; + int num = (s>=1 && snum_points-1)?2:1; // mid points are two points (start+end) + if(!dict_contains(d, &p)) { + dict_put(d, &p, (void*)(ptroff_t)num); + } else { + int count = (ptroff_t)dict_lookup(d, &p); + dict_del(d, &p); + count+=num; + dict_put(d, &p, (void*)(ptroff_t)count); + } + } } 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); + fprintf(stderr, "Point (%d,%d) occurs %d times\n", p->x, p->y, count); dict_destroy(d); - return 0; + assert(count%2 == 0); } } dict_destroy(d); @@ -184,77 +205,97 @@ char gfxpoly_check(gfxpoly_t*poly) void gfxpoly_dump(gfxpoly_t*poly) { - edge_t* s = poly->edges; + int s,t; double g = poly->gridsize; - while(s) { - 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; + fprintf(stderr, "polyon %p (gridsize: %f)\n", poly, poly->gridsize); + gfxpolystroke_t*stroke = poly->strokes; + for(;stroke;stroke=stroke->next) { + fprintf(stderr, "%11p", stroke); + if(stroke->dir==DIR_UP) { + for(s=stroke->num_points-1;s>=1;s--) { + point_t a = stroke->points[s]; + point_t b = stroke->points[s-1]; + fprintf(stderr, "%s (%f,%f) -> (%f,%f)%s%s\n", s!=stroke->num_points-1?" ":"", a.x*g, a.y*g, b.x*g, b.y*g, + s==1?"]":"", a.y==b.y?"H":""); + } + } else { + for(s=0;snum_points-1;s++) { + point_t a = stroke->points[s]; + point_t b = stroke->points[s+1]; + fprintf(stderr, "%s (%f,%f) -> (%f,%f)%s%s\n", s?" ":"", a.x*g, a.y*g, b.x*g, b.y*g, + s==stroke->num_points-2?"]":"", a.y==b.y?"H":""); + } + } } } -gfxpoly_t* gfxpoly_save(gfxpoly_t*poly, const char*filename) +void gfxpoly_save(gfxpoly_t*poly, const char*filename) { FILE*fi = fopen(filename, "wb"); fprintf(fi, "%% gridsize %f\n", poly->gridsize); fprintf(fi, "%% begin\n"); - edge_t* s = poly->edges; - while(s) { - fprintf(fi, "%g setgray\n", s->b.y < s->a.y ? 0.7 : 0); - fprintf(fi, "%d %d moveto\n", s->a.x, s->a.y); - fprintf(fi, "%d %d lineto\n", s->b.x, s->b.y); - fprintf(fi, "stroke\n"); - s = s->next; + int s,t; + gfxpolystroke_t*stroke = poly->strokes; + for(;stroke;stroke=stroke->next) { + fprintf(fi, "%g setgray\n", stroke->dir==DIR_UP ? 0.7 : 0); + point_t p = stroke->points[0]; + fprintf(fi, "%d %d moveto\n", p.x, p.y); + for(s=1;snum_points;s++) { + p = stroke->points[s]; + fprintf(fi, "%d %d lineto\n", p.x, p.y); + } + fprintf(fi, "stroke\n"); } fprintf(fi, "showpage\n"); fclose(fi); } -inline static event_t event_new() +inline static event_t* event_new() { - event_t e; - memset(&e, 0, sizeof(e)); + event_t*e = rfx_calloc(sizeof(event_t)); return e; } +inline static void event_free(event_t*e) +{ + free(e); +} static void event_dump(event_t*e) { if(e->type == EVENT_HORIZONTAL) { - fprintf(stderr, "Horizontal [%d] (%d,%d) -> (%d,%d)\n", e->s1->nr, e->s1->a.x, e->s1->a.y, e->s1->b.x, e->s1->b.y); + fprintf(stderr, "Horizontal [%d] (%d,%d) -> (%d,%d)\n", (int)e->s1->nr, e->s1->a.x, e->s1->a.y, e->s1->b.x, e->s1->b.y); } else if(e->type == EVENT_START) { - fprintf(stderr, "event: segment [%d] starts at (%d,%d)\n", e->s1->nr, e->p.x, e->p.y); + fprintf(stderr, "event: segment [%d] starts at (%d,%d)\n", (int)e->s1->nr, e->p.x, e->p.y); } else if(e->type == EVENT_END) { - fprintf(stderr, "event: segment [%d] ends at (%d,%d)\n", e->s1->nr, e->p.x, e->p.y); + fprintf(stderr, "event: segment [%d] ends at (%d,%d)\n", (int)e->s1->nr, e->p.x, e->p.y); } else if(e->type == EVENT_CROSS) { - fprintf(stderr, "event: segment [%d] and [%d] intersect at (%d,%d)\n", e->s1->nr, e->s2->nr, e->p.x, e->p.y); - } else if(e->type == EVENT_CORNER) { - fprintf(stderr, "event: segment [%d] ends, segment [%d] starts, at (%d,%d)\n", e->s1->nr, e->s2->nr, e->p.x, e->p.y); + fprintf(stderr, "event: segment [%d] and [%d] intersect at (%d,%d)\n", (int)e->s1->nr, (int)e->s2->nr, e->p.x, e->p.y); } else { assert(0); } } -static inline max32(int32_t v1, int32_t v2) {return v1>v2?v1:v2;} -static inline min32(int32_t v1, int32_t v2) {return v1v2?v1:v2;} +static inline int32_t min32(int32_t v1, int32_t v2) {return v1(%d,%d) ", s->nr, s->a.x, s->a.y, s->b.x, s->b.y); - fprintf(stderr, " dx:%d dy:%d k:%f dx/dy=%f\n", s->delta.x, s->delta.y, s->k, - (double)s->delta.x / s->delta.y); + fprintf(stderr, "[%d] (%d,%d)->(%d,%d) ", (int)s->nr, s->a.x, s->a.y, s->b.x, s->b.y); + fprintf(stderr, " dx:%d dy:%d k:%f dx/dy=%f fs=%p\n", s->delta.x, s->delta.y, s->k, + (double)s->delta.x / s->delta.y, s->fs); } -static void segment_init(segment_t*s, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int polygon_nr) +static void segment_init(segment_t*s, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int polygon_nr, segment_dir_t dir) { - if(y1dir = DIR_DOWN; - } else if(y1>y2) { - int32_t x = x1;x1=x2;x2=x; - int32_t y = y1;y1=y2;y2=y; - s->dir = DIR_UP; + s->dir = dir; + if(y1!=y2) { + assert(y1dir = DIR_UP; if(x1>x2) { s->dir = DIR_DOWN; @@ -275,13 +316,15 @@ static void segment_init(segment_t*s, int32_t x1, int32_t y1, int32_t x2, int32_ s->pos = s->a; s->polygon_nr = polygon_nr; -#define XDEBUG -#ifdef XDEBUG static int segment_count=0; s->nr = segment_count++; -#endif #ifdef CHECKS + /* notice: on some systems (with some compilers), for the line + (1073741823,-1073741824)->(1073741823,1073741823) + we get LINE_EQ(s->a, s) == 1. + That's why we now clamp to 26 bit. + */ assert(LINE_EQ(s->a, s) == 0); assert(LINE_EQ(s->b, s) == 0); @@ -299,45 +342,84 @@ static void segment_init(segment_t*s, int32_t x1, int32_t y1, int32_t x2, int32_ assert(LINE_EQ(p, s) >= 0); #endif +#ifndef DONT_REMEMBER_CROSSINGS dict_init2(&s->scheduled_crossings, &ptr_type, 0); +#endif } -static segment_t* segment_new(int32_t x1, int32_t y1, int32_t x2, int32_t y2, int polygon_nr) +static segment_t* segment_new(point_t a, point_t b, int polygon_nr, segment_dir_t dir) { segment_t*s = (segment_t*)rfx_calloc(sizeof(segment_t)); - segment_init(s, x1, y1, x2, y2, polygon_nr); + segment_init(s, a.x, a.y, b.x, b.y, polygon_nr, dir); return s; } -static void segment_destroy(segment_t*s) +static void segment_clear(segment_t*s) { +#ifndef DONT_REMEMBER_CROSSINGS dict_clear(&s->scheduled_crossings); +#endif +} +static void segment_destroy(segment_t*s) +{ + segment_clear(s); free(s); } -static void gfxpoly_enqueue(edge_t*list, heap_t*queue, int polygon_nr) +static void advance_stroke(queue_t*queue, hqueue_t*hqueue, gfxpolystroke_t*stroke, int polygon_nr, int pos) { - edge_t*l; - for(l=list;l;l=l->next) { - if(l->a.x == l->b.x && - l->a.y == l->b.y) { - 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, polygon_nr); + if(!stroke) + return; + segment_t*s = 0; + /* we need to queue multiple segments at once because we need to process start events + before horizontal events */ + while(pos < stroke->num_points-1) { + assert(stroke->points[pos].y <= stroke->points[pos+1].y); + s = segment_new(stroke->points[pos], stroke->points[pos+1], polygon_nr, stroke->dir); + s->fs = stroke->fs; + pos++; + s->stroke = 0; + s->stroke_pos = 0; #ifdef DEBUG - if(l->tmp) - s->nr = l->tmp; - fprintf(stderr, "[%d] (%d,%d) -> (%d,%d) %s\n", - s->nr, s->a.x, s->a.y, s->b.x, s->b.y, - s->dir==DIR_UP?"up":"down"); -#endif - event_t e = event_new(); - e.type = s->delta.y ? EVENT_START : EVENT_HORIZONTAL; - e.p = s->a; - e.s1 = s; - e.s2 = 0; - heap_put(queue, &e); + /*if(l->tmp) + s->nr = l->tmp;*/ + fprintf(stderr, "[%d] (%d,%d) -> (%d,%d) %s (stroke %p, %d more to come)\n", + s->nr, s->a.x, s->a.y, s->b.x, s->b.y, + s->dir==DIR_UP?"up":"down", stroke, stroke->num_points - 1 - pos); +#endif + event_t* e = event_new(); + e->type = s->delta.y ? EVENT_START : EVENT_HORIZONTAL; + e->p = s->a; + e->s1 = s; + e->s2 = 0; + + if(queue) queue_put(queue, e); + else hqueue_put(hqueue, e); + + if(e->type != EVENT_HORIZONTAL) { + break; + } + } + if(s) { + s->stroke = stroke; + s->stroke_pos = pos; + } +} + +static void gfxpoly_enqueue(gfxpoly_t*p, queue_t*queue, hqueue_t*hqueue, int polygon_nr) +{ + int t; + gfxpolystroke_t*stroke = p->strokes; + for(;stroke;stroke=stroke->next) { + assert(stroke->num_points > 1); + +#ifdef CHECKS + int s; + for(s=0;snum_points-1;s++) { + assert(stroke->points[s].y <= stroke->points[s+1].y); + } +#endif + advance_stroke(queue, hqueue, stroke, polygon_nr, 0); } } @@ -345,12 +427,12 @@ static void schedule_endpoint(status_t*status, segment_t*s) { // schedule end point of segment assert(s->b.y > status->y); - event_t e; - e.type = EVENT_END; - e.p = s->b; - e.s1 = s; - e.s2 = 0; - heap_put(status->queue, &e); + event_t*e = event_new(); + e->type = EVENT_END; + e->p = s->b; + e->s1 = s; + e->s2 = 0; + queue_put(&status->queue, e); } static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) @@ -358,7 +440,6 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) /* the code that's required (and the checks you can perform) before it can be said with 100% certainty that we indeed have a valid crossing amazes me every time. -mk */ - #ifdef CHECKS assert(s1!=s2); assert(s1->right == s2); @@ -383,15 +464,25 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) #endif if(s1->maxx <= s2->minx) { +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: bounding boxes don't intersect\n", s1->nr, s2->nr); +#endif /* bounding boxes don't intersect */ return; } - if(dict_contains(&s1->scheduled_crossings, s2)) { +#ifndef DONT_REMEMBER_CROSSINGS + if(dict_contains(&s1->scheduled_crossings, (void*)(ptroff_t)s2->nr)) { /* FIXME: this whole segment hashing thing is really slow */ - //fprintf(stderr, "Encountered crossing between [%d] and [%d] twice\n", s1->nr, s2->nr); +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: we already scheduled this intersection\n", s1->nr, s2->nr); +// DICT_ITERATE_KEY(&s1->scheduled_crossings, void*, x) { +// fprintf(stderr, "[%d]<->[%d]\n", s1->nr, (int)(ptroff_t)x); +// } +#endif return; // we already know about this one } +#endif double det = (double)s1->delta.x*s2->delta.y - (double)s1->delta.y*s2->delta.x; if(!det) { @@ -402,20 +493,15 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) #endif return; } else { +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: they are parallel to each other\n", s1->nr, s2->nr); +#endif /* lines are parallel */ return; } } + double asign2 = LINE_EQ(s1->a, s2); - double bsign2 = LINE_EQ(s1->b, s2); - if(asign2<0 && bsign2<0) { - // segment1 is completely to the left of segment2 - return; - } - if(asign2>0 && bsign2>0) { - // segment2 is completely to the left of segment1 - return; - } if(asign2==0) { // segment1 touches segment2 in a single point (ignored) #ifdef DEBUG @@ -423,6 +509,7 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) #endif return; } + double bsign2 = LINE_EQ(s1->b, s2); if(bsign2==0) { // segment1 touches segment2 in a single point (ignored) #ifdef DEBUG @@ -430,16 +517,26 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) #endif return; } - double asign1 = LINE_EQ(s2->a, s1); - double bsign1 = LINE_EQ(s2->b, s1); - if(asign1<0 && bsign1<0) { + + if(asign2<0 && bsign2<0) { // segment1 is completely to the left of segment2 +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: [%d] is completely to the left of [%d]\n", s1->nr, s2->nr, s1->nr, s2->nr); +#endif return; } - if(asign1>0 && bsign1>0) { - // segment2 is completely to the left of segment1 + if(asign2>0 && bsign2>0) { + // segment1 is completely to the right of segment2 +#ifndef DONT_REMEMBER_CROSSINGS + assert(0); +#endif +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: [%d] is completely to the left of [%d]\n", s1->nr, s2->nr, s2->nr, s1->nr); +#endif return; } + + double asign1 = LINE_EQ(s2->a, s1); if(asign1==0) { // segment2 touches segment1 in a single point (ignored) #ifdef DEBUG @@ -447,6 +544,7 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) #endif return; } + double bsign1 = LINE_EQ(s2->b, s1); if(asign2==0) { // segment2 touches segment1 in a single point (ignored) #ifdef DEBUG @@ -455,6 +553,34 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) return; } + if(asign1<0 && bsign1<0) { + // segment2 is completely to the left of segment1 +#ifndef DONT_REMEMBER_CROSSINGS + assert(0); +#endif +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: [%d] is completely to the left of [%d]\n", s1->nr, s2->nr, s1->nr, s2->nr); +#endif + return; + } + if(asign1>0 && bsign1>0) { + // segment2 is completely to the right of segment1 +#ifdef DEBUG + fprintf(stderr, "[%d] doesn't intersect with [%d] because: [%d] is completely to the left of [%d]\n", s1->nr, s2->nr, s2->nr, s1->nr); +#endif + return; + } + +#ifdef DONT_REMEMBER_CROSSINGS + /* s2 crosses s1 from *left* to *right*. This is a crossing we already processed- + there's not way s2 would be to the left of s1 otherwise */ + if(asign1<0 && bsign1>0) return; + if(asign2>0 && bsign2<0) return; +#endif + + assert(!(asign1<0 && bsign1>0)); + assert(!(asign2>0 && bsign2<0)); + /* TODO: should we precompute these? */ double la = (double)s1->a.x*(double)s1->b.y - (double)s1->a.y*(double)s1->b.x; double lb = (double)s2->a.x*(double)s2->b.y - (double)s2->a.y*(double)s2->b.x; @@ -471,24 +597,28 @@ static void schedule_crossing(status_t*status, segment_t*s1, segment_t*s2) point_t pair; pair.x = s1->nr; pair.y = s2->nr; +#ifndef DONT_REMEMBER_CROSSINGS assert(!dict_contains(status->seen_crossings, &pair)); dict_put(status->seen_crossings, &pair, 0); #endif +#endif #ifdef DEBUG fprintf(stderr, "schedule crossing between [%d] and [%d] at (%d,%d)\n", s1->nr, s2->nr, p.x, p.y); #endif +#ifndef DONT_REMEMBER_CROSSINGS /* we insert into each other's intersection history because these segments might switch places and we still want to look them up quickly after they did */ - dict_put(&s1->scheduled_crossings, s2, 0); - dict_put(&s2->scheduled_crossings, s1, 0); - - event_t e = event_new(); - e.type = EVENT_CROSS; - e.p = p; - e.s1 = s1; - e.s2 = s2; - heap_put(status->queue, &e); + dict_put(&s1->scheduled_crossings, (void*)(ptroff_t)(s2->nr), 0); + dict_put(&s2->scheduled_crossings, (void*)(ptroff_t)(s1->nr), 0); +#endif + + event_t* e = event_new(); + e->type = EVENT_CROSS; + e->p = p; + e->s1 = s1; + e->s2 = s2; + queue_put(&status->queue, e); return; } @@ -529,7 +659,6 @@ static inline box_t box_new(int32_t x, int32_t y) return box; } - static void insert_point_into_segment(status_t*status, segment_t*s, point_t p) { assert(s->pos.x != p.x || s->pos.y != p.y); @@ -545,17 +674,40 @@ static void insert_point_into_segment(status_t*status, segment_t*s, point_t p) fprintf(stderr, "[%d] receives next point (%d,%d)->(%d,%d) (drawing)\n", s->nr, s->pos.x, s->pos.y, p.x, p.y); #endif + edgestyle_t*fs = s->fs_out; + segment_dir_t dir = s->wind.is_filled?DIR_DOWN:DIR_UP; + // omit horizontal lines if(s->pos.y != p.y) { - edge_t*e = rfx_calloc(sizeof(edge_t)); -#ifdef DEBUG - e->tmp = s->nr; -#endif - e->a = s->pos; - e->b = p; - assert(e->a.y != e->b.y); - e->next = status->output; - status->output = e; + point_t a = s->pos; + point_t b = p; + assert(a.y != b.y); + + gfxpolystroke_t*stroke = status->strokes; + /* find a stoke to attach this segment to. It has to have an endpoint + matching our start point, and a matching edgestyle */ + while(stroke) { + point_t p = stroke->points[stroke->num_points-1]; + if(p.x == a.x && p.y == a.y && stroke->fs == fs && stroke->dir == dir) + break; + stroke = stroke->next; + } + if(!stroke) { + stroke = rfx_calloc(sizeof(gfxpolystroke_t)); + stroke->dir = dir; + stroke->fs = fs; + stroke->next = status->strokes; + status->strokes = stroke; + stroke->points_size = 2; + stroke->points = rfx_calloc(sizeof(point_t)*stroke->points_size); + stroke->points[0] = a; + stroke->num_points = 1; + } else if(stroke->num_points == stroke->points_size) { + assert(stroke->fs); + stroke->points_size *= 2; + stroke->points = rfx_realloc(stroke->points, sizeof(point_t)*stroke->points_size); + } + stroke->points[stroke->num_points++] = b; } } else { #ifdef DEBUG @@ -596,7 +748,6 @@ static void segrange_test_segment_min(segrange_t*range, segment_t*seg, int32_t y /* we need to calculate the xpos anew (and can't use start coordinate or intersection coordinate), because we need the xpos exactly at the end of this scanline. - TODO: might be faster to use XPOS_COMPARE here (see also _max) */ double x = XPOS(seg, y); if(!range->segmin || xxmin) { @@ -652,7 +803,7 @@ static void add_points_to_positively_sloped_segments(status_t*status, int32_t y, //break; } } - seg = actlist_right(status->actlist, seg); + seg = seg->right; } } segrange_test_segment_min(range, first, y); @@ -691,7 +842,7 @@ static void add_points_to_negatively_sloped_segments(status_t*status, int32_t y, //break; } } - seg = actlist_left(status->actlist, seg); + seg = seg->left; } } segrange_test_segment_min(range, last, y); @@ -721,6 +872,7 @@ static void add_points_to_ending_segments(status_t*status, int32_t y) if(status->xrow->num == 1) { // shortcut + assert(seg->b.x == status->xrow->x[0]); point_t p = {status->xrow->x[0], y}; insert_point_into_segment(status, seg, p); } else { @@ -779,7 +931,7 @@ static void recalculate_windings(status_t*status, segrange_t*range) s = range->segmin; #endif #ifdef CHECKS - /* test sanity: check that we don't have changed segments + /* test sanity: verify that we don't have changed segments outside of the given range */ s = actlist_leftmost(status->actlist); while(s && s!=range->segmin) { @@ -792,13 +944,13 @@ static void recalculate_windings(status_t*status, segrange_t*range) s = s->left; } /* in check mode, go through the whole interval so we can test - that all polygons where the fillstyle changed also have seg->changed=1 */ + that all polygons where the edgestyle changed also have seg->changed=1 */ s = actlist_leftmost(status->actlist); end = 0; #endif if(end) - end = actlist_right(status->actlist, end); + end = end->right; while(s!=end) { #ifndef CHECKS if(s->changed) @@ -807,19 +959,20 @@ static void recalculate_windings(status_t*status, segrange_t*range) segment_t* left = actlist_left(status->actlist, s); windstate_t wind = left?left->wind:status->windrule->start(status->context); s->wind = status->windrule->add(status->context, wind, s->fs, s->dir, s->polygon_nr); - fillstyle_t*fs_old = s->fs_out; + edgestyle_t*fs_old = s->fs_out; s->fs_out = status->windrule->diff(&wind, &s->wind); +#ifdef DEBUG + fprintf(stderr, "[%d] dir=%s wind=%d wind.filled=%s fs_old/new=%s/%s %s\n", s->nr, s->dir==DIR_UP?"up":"down", s->wind.wind_nr, s->wind.is_filled?"fill":"nofill", + fs_old?"draw":"omit", s->fs_out?"draw":"omit", + fs_old!=s->fs_out?"CHANGED":""); +#endif assert(!(!s->changed && fs_old!=s->fs_out)); s->changed = 0; #ifdef CHECKS s->fs_out_ok = 1; #endif -#ifdef DEBUG - fprintf(stderr, "[%d] %s/%d/%s/%s %s\n", s->nr, s->dir==DIR_UP?"up":"down", s->wind.wind_nr, s->wind.is_filled?"fill":"nofill", s->fs_out?"draw":"omit", - fs_old!=s->fs_out?"CHANGED":""); -#endif } s = s->right; } @@ -869,11 +1022,13 @@ static void event_apply(status_t*status, event_t*e) { switch(e->type) { case EVENT_HORIZONTAL: { + segment_t*s = e->s1; #ifdef DEBUG event_dump(e); #endif - intersect_with_horizontal(status, e->s1); - segment_destroy(e->s1);e->s1=0; + intersect_with_horizontal(status, s); + advance_stroke(&status->queue, 0, s->stroke, s->polygon_nr, s->stroke_pos); + segment_destroy(s);e->s1=0; break; } case EVENT_END: { @@ -888,14 +1043,16 @@ static void event_apply(status_t*status, event_t*e) assert(!dict_contains(status->intersecting_segs, s)); assert(!dict_contains(status->segs_with_point, s)); #endif - segment_t*left = actlist_left(status->actlist, s); - segment_t*right = actlist_right(status->actlist, s); + segment_t*left = s->left; + segment_t*right = s->right; actlist_delete(status->actlist, s); if(left && right) schedule_crossing(status, left, right); + /* schedule segment for xrow handling */ s->left = 0; s->right = status->ending_segments; status->ending_segments = s; + advance_stroke(&status->queue, 0, s->stroke, s->polygon_nr, s->stroke_pos); break; } case EVENT_START: { @@ -906,13 +1063,13 @@ static void event_apply(status_t*status, event_t*e) segment_t*s = e->s1; assert(e->p.x == s->a.x && e->p.y == s->a.y); actlist_insert(status->actlist, s->a, s->b, s); - segment_t*left = actlist_left(status->actlist, s); - segment_t*right = actlist_right(status->actlist, s); + segment_t*left = s->left; + segment_t*right = s->right; if(left) schedule_crossing(status, left, s); if(right) schedule_crossing(status, s, right); - schedule_endpoint(status, e->s1); + schedule_endpoint(status, s); break; } case EVENT_CROSS: { @@ -920,25 +1077,30 @@ static void event_apply(status_t*status, event_t*e) #ifdef DEBUG event_dump(e); #endif - if(actlist_right(status->actlist, e->s1) == e->s2 && - actlist_left(status->actlist, e->s2) == e->s1) { + if(e->s1->right == e->s2) { + assert(e->s2->left == e->s1); exchange_two(status, e); } else { + assert(e->s2->left != e->s1); #ifdef DEBUG fprintf(stderr, "Ignore this crossing ([%d] not next to [%d])\n", e->s1->nr, e->s2->nr); #endif +#ifndef DONT_REMEMBER_CROSSINGS /* ignore this crossing for now (there are some line segments in between). it'll get rescheduled as soon as the "obstacles" are gone */ - char del1 = dict_del(&e->s1->scheduled_crossings, e->s2); - char del2 = dict_del(&e->s2->scheduled_crossings, e->s1); + char del1 = dict_del(&e->s1->scheduled_crossings, (void*)(ptroff_t)e->s2->nr); + char del2 = dict_del(&e->s2->scheduled_crossings, (void*)(ptroff_t)e->s1->nr); assert(del1 && del2); +#endif #ifdef CHECKS point_t pair; pair.x = e->s1->nr; pair.y = e->s2->nr; +#ifndef DONT_REMEMBER_CROSSINGS assert(dict_contains(status->seen_crossings, &pair)); dict_del(status->seen_crossings, &pair); #endif +#endif } } } @@ -952,7 +1114,7 @@ static void check_status(status_t*status) s->pos.y != s->b.y) && !dict_contains(status->segs_with_point, s)) { fprintf(stderr, "Error: segment [%d] (%sslope) intersects in scanline %d, but it didn't receive a point\n", - s->nr, + SEGNR(s), s->delta.x<0?"-":"+", status->y); assert(0); @@ -974,127 +1136,180 @@ static void add_horizontals(gfxpoly_t*poly, windrule_t*windrule, windcontext_t*c #ifdef DEBUG fprintf(stderr, "========================================================================\n"); #endif - heap_t* queue = heap_new(sizeof(event_t), compare_events_simple); - gfxpoly_enqueue(poly->edges, queue, 0); + hqueue_t hqueue; + hqueue_init(&hqueue); + gfxpoly_enqueue(poly, 0, &hqueue, 0); actlist_t* actlist = actlist_new(); - - event_t*e = heap_chopmax(queue); + + event_t*e = hqueue_get(&hqueue); while(e) { int32_t y = e->p.y; int32_t x = 0; - char fill = 0; #ifdef DEBUG - fprintf(stderr, "----------------------------------- %d\n", y); + fprintf(stderr, "HORIZONTALS ----------------------------------- %d\n", y); actlist_dump(actlist, y-1); #endif #ifdef CHECKS actlist_verify(actlist, y-1); #endif + edgestyle_t*fill = 0; + char dir_up = 0; + char dir_down = 0; + do { + assert(e->s1->fs); if(fill && x != e->p.x) { + assert(!dir_up || !dir_down); + assert(dir_up || dir_down); #ifdef DEBUG fprintf(stderr, "%d) draw horizontal line from %d to %d\n", y, x, e->p.x); #endif assert(xp.x); - edge_t*l= malloc(sizeof(edge_t)); - l->a.y = l->b.y = y; - /* TODO: strictly speaking we need to draw from low x to high x so that left/right fillstyles add up - (because the horizontal line's fill style controls the area *below* the line) + + gfxpolystroke_t*stroke = rfx_calloc(sizeof(gfxpolystroke_t)); + stroke->next = poly->strokes; + poly->strokes = stroke; + + stroke->num_points = 2; + stroke->points = malloc(sizeof(point_t)*2); + stroke->dir = dir_up?DIR_UP:DIR_DOWN; + stroke->fs = fill; + point_t a,b; + a.y = b.y = y; + /* we draw from low x to high x so that left/right fillstyles add up + (because the horizontal line's fill style controls the area *below* the line) */ - l->a.x = x; - l->b.x = e->p.x; - l->next = poly->edges; - poly->edges = l; + a.x = e->p.x; + b.x = x; + stroke->points[0] = a; + stroke->points[1] = b; #ifdef CHECKS /* the output should always be intersection free polygons, so check this horizontal - line isn't hacking through any segments in the active list */ - segment_t* start = actlist_find(actlist, l->a, l->a); - segment_t* s = actlist_find(actlist, l->b, l->b); + line isn't puncturing any segments in the active list */ + segment_t* start = actlist_find(actlist, b, b); + segment_t* s = actlist_find(actlist, a, a); while(s!=start) { assert(s->a.y == y || s->b.y == y); s = s->left; } #endif } - segment_t*left = 0; - segment_t*s = e->s1; - windstate_t before,after; + segment_t*s = e->s1; + + segment_t*left = 0; switch(e->type) { case EVENT_START: { assert(e->p.x == s->a.x && e->p.y == s->a.y); actlist_insert(actlist, s->a, s->b, s); - event_t e; - e.type = EVENT_END; - e.p = s->b; - e.s1 = s; - e.s2 = 0; - heap_put(queue, &e); + event_t* e = event_new(); + e->type = EVENT_END; + e->p = s->b; + e->s1 = s; + e->s2 = 0; + hqueue_put(&hqueue, e); left = actlist_left(actlist, s); - - before = left?left->wind:windrule->start(context); - after = s->wind = windrule->add(context, before, s->fs, s->dir, s->polygon_nr); + if(e->s1->dir==DIR_UP) + dir_up^=1; + else + dir_down^=1; break; } case EVENT_END: { left = actlist_left(actlist, s); actlist_delete(actlist, s); - - before = s->wind; - after = left?left->wind:windrule->start(context); + advance_stroke(0, &hqueue, s->stroke, s->polygon_nr, s->stroke_pos); + if(e->s1->dir==DIR_DOWN) + dir_up^=1; + else + dir_down^=1; break; } default: assert(0); } x = e->p.x; - fill ^= 1;//(before.is_filled != after.is_filled); + + fill = fill?0:&edgestyle_default; +#if 0 + if(windrule==&windrule_evenodd) { + if(!!fill != !!fill2) { + segment_dump(s); + event_dump(e); + printf("at y=%d x=%d (hline:%p)\n", e->p.y, x, old_fill); + if(e->type==EVENT_END) { + printf(" %9p\n", s->fs); + printf(" |\n"); + } + printf(" %3d %c%2d \n", before1.is_filled, e->type==EVENT_END?'|':' ', after1.is_filled); + printf("%12p -----+----- %p\n", old_fill, fill2); + printf(" %3d %c%2d \n", before2.is_filled, e->type==EVENT_START?'|':' ', after2.is_filled); + if(e->type==EVENT_START) { + printf(" |\n"); + printf(" %9p\n", s->fs); + } + } + assert(!!fill == !!fill2); + } +#endif + #ifdef DEBUG - fprintf(stderr, "%d) event=%s[%d] left:[%d] x:%d before:%d after:%d\n", + fprintf(stderr, "%d) event=%s[%d] left:[%d] x:%d\n", y, e->type==EVENT_START?"start":"end", s->nr, left?left->nr:-1, - x, - before.is_filled, after.is_filled); + x); #endif if(e->type == EVENT_END) segment_destroy(s); - free(e); - e = heap_chopmax(queue); + event_free(e); + e = hqueue_get(&hqueue); } while(e && y == e->p.y); - assert(!fill); // check that polygon is not bleeding +#ifdef CHECKS + edgestyle_t*bleeding = fill; + assert(!bleeding); +#endif } + actlist_destroy(actlist); - heap_destroy(queue); + hqueue_destroy(&hqueue); } -gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule, windcontext_t*context) +gfxpoly_t* gfxpoly_process(gfxpoly_t*poly1, gfxpoly_t*poly2, windrule_t*windrule, windcontext_t*context) { - current_polygon = poly; - heap_t* queue = heap_new(sizeof(event_t), compare_events); - - gfxpoly_enqueue(poly->edges, queue, /*polygon nr*/0); + current_polygon = poly1; status_t status; memset(&status, 0, sizeof(status_t)); - status.queue = queue; + queue_init(&status.queue); + gfxpoly_enqueue(poly1, &status.queue, 0, /*polygon nr*/0); + if(poly2) { + assert(poly1->gridsize == poly2->gridsize); + gfxpoly_enqueue(poly2, &status.queue, 0, /*polygon nr*/1); + } + status.windrule = windrule; status.context = context; status.actlist = actlist_new(); + #ifdef CHECKS status.seen_crossings = dict_new2(&point_type); + int32_t lasty=-0x80000000; #endif status.xrow = xrow_new(); - event_t*e = heap_chopmax(queue); + event_t*e = queue_get(&status.queue); while(e) { + assert(e->s1->fs); status.y = e->p.y; #ifdef CHECKS + assert(status.y>=lasty); + lasty = status.y; status.intersecting_segs = dict_new2(&ptr_type); status.segs_with_point = dict_new2(&ptr_type); #endif @@ -1110,8 +1325,8 @@ gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule, windcontext_t*co do { xrow_add(status.xrow, e->p.x); event_apply(&status, e); - free(e); - e = heap_chopmax(queue); + event_free(e); + e = queue_get(&status.queue); } while(e && status.y == e->p.y); xrow_sort(status.xrow); @@ -1135,12 +1350,34 @@ gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule, windcontext_t*co dict_destroy(status.seen_crossings); #endif actlist_destroy(status.actlist); - heap_destroy(queue); + queue_destroy(&status.queue); xrow_destroy(status.xrow); - gfxpoly_t*p = gfxpoly_new(poly->gridsize); - p->edges = status.output; + gfxpoly_t*p = (gfxpoly_t*)malloc(sizeof(gfxpoly_t)); + p->gridsize = poly1->gridsize; + p->strokes = status.strokes; + +#ifdef CHECKS + /* we only add segments with non-empty edgestyles to strokes in + recalculate_windings, but better safe than sorry */ + gfxpolystroke_t*stroke = p->strokes; + while(stroke) { + assert(stroke->fs); + stroke = stroke->next; + } +#endif add_horizontals(p, &windrule_evenodd, context); // output is always even/odd + //add_horizontals(p, windrule, context); return p; } + +static windcontext_t twopolygons = {2}; +gfxpoly_t* gfxpoly_intersect(gfxpoly_t*p1, gfxpoly_t*p2) +{ + return gfxpoly_process(p1, p2, &windrule_intersect, &twopolygons); +} +gfxpoly_t* gfxpoly_union(gfxpoly_t*p1, gfxpoly_t*p2) +{ + return gfxpoly_process(p1, p2, &windrule_union, &twopolygons); +}