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adjust max zoom level according to maximum allowed scale factor

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This commit is contained in:
Jindřich Makovička 2012-12-04 21:27:40 +01:00
parent a21b524586
commit ac6ca98a5b
1 changed files with 6 additions and 2 deletions
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6
OsmAnd/src/net/osmand/plus/SQLiteTileSource.java
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@ -45,6 +45,7 @@ public class SQLiteTileSource implements ITileSource {
final int margin = 1;
final int tileSize = 256;
final int minScaledSize = 8;
public SQLiteTileSource(File f, List<TileSourceTemplate> toFindUrl){
this.file = f;
@ -154,6 +155,9 @@ public class SQLiteTileSource implements ITileSource {
if (z < 17 && z >= 0)
baseZoom = 17 - (int)z; // sqlite base zoom, =11 for SRTM hillshade
maxZoom = 17; // Cheat to have tiles request even if zoom level not in sqlite
// decrease maxZoom if too much scaling would be required
while ((tileSize >> (maxZoom - baseZoom)) < minScaledSize)
maxZoom--;
z = db.compileStatement("SELECT maxzoom FROM info").simpleQueryForLong(); //$NON-NLS-1$
if (z < 17)
minZoom = 17 - (int)z;
@ -285,7 +289,7 @@ public class SQLiteTileSource implements ITileSource {
int offset_y= y - (base_ytile << n);
int flags = 0x020;
if (scaledSize < 8)
if (scaledSize < minScaledSize)
return null;
if (offset_x == 0)