Make zoomLevel refer to a default 256^2 tile size

Currently the zoomLevel is the power of 2 reflecting how many tiles
are in a map edge.

This means that two plugins with two different tileSize will show a
map of different size at the same zoomLevel.

With this patch the zoomLevel is "normalized" upon a tileSize of 256,
regardless of the tile size in use.
In this way, the new 256 based zoom level can be a consistent parameter
also for plugins that are not tile based.

CameraCapabilities therefore now offers two new methods,
m[in,ax]imumZoomLevelAt256, that return the respective value for
the normalized 256^2 tilesize.

It also gets a setTileSize, which is currently not used as all our
plugins use a tile size of 256 (which is the camera capabilities
default tilesize value).

Change-Id: Ib12092fd14faf7fc85f8be5fb799dbd5496b760b
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/location/maps/qgeocameracapabilities_p.h b/src/location/maps/qgeocameracapabilities_p.h
index 4e498b1d..7de6ece0 100644
--- a/src/location/maps/qgeocameracapabilities_p.h
+++ b/src/location/maps/qgeocameracapabilities_p.h
@@ -65,11 +65,16 @@ public:
 
     QGeoCameraCapabilities &operator = (const QGeoCameraCapabilities &other);
 
+    void setTileSize(int tileSize);
+    int tileSize() const;
+
     void setMinimumZoomLevel(double minimumZoomLevel);
     double minimumZoomLevel() const;
+    double minimumZoomLevelAt256() const;
 
     void setMaximumZoomLevel(double maximumZoomLevel);
     double maximumZoomLevel() const;
+    double maximumZoomLevelAt256() const;
 
     void setSupportsBearing(bool supportsBearing);
     bool supportsBearing() const;