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Added overzoom description

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Martin Tůma 2023-12-10 15:16:23 +01:00
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commit ea98da4a74
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@ -34,6 +34,17 @@ reader.read(&image);
```
you will get 1024x1024px tiles with a pixel ratio of 2 (= HiDPI tiles).
Since version 2.7 tile "overzoom" is supported. If you set *format* to
"$zoom;$overzoom":
```cpp
QPixmap pm;
pm.loadFromData(tileData, QByteArray::number(zoom) + ';' +
QByteArray::number(overzoom));
```
you will get (512<<overzoom)x(512<<overzoom)px tiles with a pixel ratio of 1.
When overzoom is combined with setScaledSize(), the base size is the overzoomed
tile size.
For a sample code see the [pbf2png](https://github.com/tumic0/pbf2png)
conversion utility.