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Keep the resolution constant as we drop features to make the tile fit

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Eric Fischer
2015-05-20 15:15:45 -07:00
parent 555ababd2e
commit 901f6a76b6
1 changed files with 6 additions and 2 deletions
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tile.cc
+6 -2
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@@ -443,7 +443,7 @@ long long write_tile(char **geoms, char *metabase, unsigned *file_bbox, int z, u
geom = remove_noop(geom, t); geom = remove_noop(geom, t);
} }
if (line_detail == detail) { /* only write out the next zoom once, even if we retry */ if (line_detail == detail && fraction == 1) { /* only write out the next zoom once, even if we retry */
if (geom.size() > 0 && z + 1 <= file_maxzoom) { if (geom.size() > 0 && z + 1 <= file_maxzoom) {
int j; int j;
for (j = 0; j < 4; j++) { for (j = 0; j < 4; j++) {
@@ -692,8 +692,12 @@ long long write_tile(char **geoms, char *metabase, unsigned *file_bbox, int z, u
} }
if (prevent['d' & 0xFF]) { if (prevent['d' & 0xFF]) {
fraction = fraction * 500000 / compressed.size(); // The 95% is a guess to avoid too many retries
// and probably actually varies based on how much duplicated metadata there is
fraction = fraction * 500000 / compressed.size() * 0.95;
fprintf(stderr, "Going to try keeping %0.2f%% of the features to make it fit\n", fraction * 100); fprintf(stderr, "Going to try keeping %0.2f%% of the features to make it fit\n", fraction * 100);
line_detail++; // to keep it the same when the loop decrements it
} }
} else { } else {
mbtiles_write_tile(outdb, z, tx, ty, compressed.data(), compressed.size()); mbtiles_write_tile(outdb, z, tx, ty, compressed.data(), compressed.size());