94 lines
2 KiB
C++
94 lines
2 KiB
C++
//#define use_int32
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#include <emscripten.h>
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#include "clipper.hpp"
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typedef unsigned char Uint8;
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typedef unsigned short Uint16;
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typedef unsigned int Uint32;
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typedef int int32;
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Uint8 *mem = 0;
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extern "C" {
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extern void polygon(Uint32 points, Uint32 inners);
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extern void point(Uint32 x, Uint32 y);
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}
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struct length16 {
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Uint16 length;
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};
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struct point32 {
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int32 x;
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int32 y;
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};
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__attribute__ ((export_name("mem_get")))
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Uint32 mem_get(Uint32 size) {
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return (Uint32)malloc(size);
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}
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__attribute__ ((export_name("mem_clr")))
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void mem_clr(Uint32 loc) {
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free((void *)loc);
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}
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__attribute__ ((export_name("poly_offset")))
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Uint32 poly_offset(Uint32 memat, Uint32 polys, float offset) {
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using namespace ClipperLib;
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Paths ins(polys);
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Paths outs;
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Uint32 pos = memat;
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Uint16 poly = 0;
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while (poly < polys) {
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struct length16 *ls = (struct length16 *)(mem + pos);
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Uint16 points = ls->length;
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// polygon(points, 0);
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pos += 2;
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while (points-- > 0) {
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struct point32 *ip = (struct point32 *)(mem + pos);
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pos += 8;
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ins[poly] << IntPoint(ip->x, ip->y);
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// point(ip->x, ip->y);
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}
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poly++;
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}
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// clean and simplify polygons
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// Paths cleans, simples;
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// CleanPolygons(ins, cleans, 250);
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// SimplifyPolygons(cleans, simples, pftNonZero);
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// ins = simples;
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ClipperOffset co;
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co.AddPaths(ins, jtMiter, etClosedPolygon);
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co.Execute(outs, offset);
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Uint32 resat = pos;
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for (Path po : outs) {
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// polygon(po.size(), 1);
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struct length16 *ls = (struct length16 *)(mem + pos);
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ls->length = po.size();
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pos += 2;
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for (IntPoint pt : po) {
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// point(pt.X, pt.Y);
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struct point32 *ip = (struct point32 *)(mem + pos);
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ip->x = (int)pt.X;
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ip->y = (int)pt.Y;
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pos += 8;
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}
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}
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// null terminate
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struct length16 *ls = (struct length16 *)(mem + pos);
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ls->length = 0;
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co.Clear();
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return resat;
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}
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