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Add unit test for line_is_too_small

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This commit is contained in:
Erica Fischer
2025-04-25 13:40:49 -07:00
parent a84864e795
commit 82e8d96ea6
4 changed files with 33 additions and 23 deletions
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clip.cpp
+23
View File
@@ -2469,3 +2469,26 @@ drawvec fix_polygon(const drawvec &geom, bool use_winding, bool reverse_winding)
return out;
}
bool line_is_too_small(drawvec const &geometry, int z, int detail) {
if (geometry.size() == 0) {
return true;
}
long long x = 0, y = 0;
for (auto &g : geometry) {
if (g.op == VT_MOVETO) {
x = std::llround((double) g.x / (1LL << (32 - detail - z)));
y = std::llround((double) g.y / (1LL << (32 - detail - z)));
} else {
long long xx = std::llround((double) g.x / (1LL << (32 - detail - z)));
long long yy = std::llround((double) g.y / (1LL << (32 - detail - z)));
if (xx != x || yy != y) {
return false;
}
}
}
return true;
}
geometry.hpp
+1
View File
@@ -172,5 +172,6 @@ void get_quadkey_bounds(long long xmin, long long ymin, long long xmax, long lon
unsigned long long *start, unsigned long long *end);
clipbbox parse_clip_poly(std::string arg);
bool line_is_too_small(drawvec const &geometry, int z, int detail);
#endif
tile.cpp
-23
View File
@@ -1551,29 +1551,6 @@ bool find_feature_to_accumulate_onto(std::vector<std::shared_ptr<serial_feature>
return false;
}
static bool line_is_too_small(drawvec const &geometry, int z, int detail) {
if (geometry.size() == 0) {
return true;
}
long long x = 0, y = 0;
for (auto &g : geometry) {
if (g.op == VT_MOVETO) {
x = std::llround((double) g.x / (1LL << (32 - detail - z)));
y = std::llround((double) g.y / (1LL << (32 - detail - z)));
} else {
long long xx = std::llround((double) g.x / (1LL << (32 - detail - z)));
long long yy = std::llround((double) g.y / (1LL << (32 - detail - z)));
if (xx != x || yy != y) {
return false;
}
}
}
return true;
}
// Keep only a sample of 100K extents for feature dropping,
// to avoid spending lots of memory on a complete list when there are
// hundreds of millions of features.
unit.cpp
+9
View File
@@ -152,3 +152,12 @@ TEST_CASE("mvt_geometry bbox") {
REQUIRE(start == 0x1c84fc0000000000);
REQUIRE(end == 0x1c84ffffffffffff);
}
TEST_CASE("line_is_too_small") {
drawvec dv;
dv.emplace_back(VT_MOVETO, 4243099709, 2683872952);
dv.emplace_back(VT_LINETO, 4243102487, 2683873977);
dv.emplace_back(VT_MOVETO, -51867587, 2683872952);
dv.emplace_back(VT_LINETO, -51864809, 2683873977);
REQUIRE(line_is_too_small(dv, 0, 10));
}