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Delta encoding for motion within features

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Eric Fischer
2015-06-17 17:48:29 -07:00
parent 725ea71e57
commit 46626e4f08
3 changed files with 24 additions and 12 deletions
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tile.cc
+5 -2
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@@ -506,13 +506,16 @@ long long write_tile(char **geoms, char *metabase, char *stringpool, unsigned *f
serialize_byte(geomfile[j], t, &geompos[j], fname);
serialize_byte(geomfile[j], layer, &geompos[j], fname);
serialize_long_long(geomfile[j], metastart, &geompos[j], fname);
long long wx = 0, wy = 0;
for (unsigned u = 0; u < geom.size(); u++) {
serialize_byte(geomfile[j], geom[u].op, &geompos[j], fname);
if (geom[u].op != VT_CLOSEPATH) {
serialize_uint(geomfile[j], geom[u].x + sx, &geompos[j], fname);
serialize_uint(geomfile[j], geom[u].y + sy, &geompos[j], fname);
serialize_long_long(geomfile[j], geom[u].x + sx - wx, &geompos[j], fname);
serialize_long_long(geomfile[j], geom[u].y + sy - wy, &geompos[j], fname);
wx = geom[u].x + sx;
wy = geom[u].y + sy;
}
}