From ea98da4a74d654b83cb333071f045ea9989b03ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20T=C5=AFma?= <tumic@cbox.cz>
Date: Sun, 10 Dec 2023 15:16:23 +0100
Subject: [PATCH] Added overzoom description

---
 README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README.md b/README.md
index 2316023..58920a2 100644
--- a/README.md
+++ b/README.md
@@ -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.