1 files changed, 14 insertions, 2 deletions
diff --git a/src/mbgl/map/transform_state.cpp b/src/mbgl/map/transform_state.cpp
index bbf7e22b31..d1a320beae 100644
--- a/src/mbgl/map/transform_state.cpp
+++ b/src/mbgl/map/transform_state.cpp
@@ -132,7 +132,7 @@ double TransformState::getZoom() const {
     return scaleZoom(scale);
 }
 
-int32_t TransformState::getIntegerZoom() const {
+uint8_t TransformState::getIntegerZoom() const {
     return getZoom();
 }
 
@@ -358,7 +358,7 @@ void TransformState::setLatLngZoom(const LatLng& latLng, double zoom) {
         constrained = bounds->constrain(latLng);
     }
 
-    double newScale = zoomScale(zoom);
+    double newScale = util::clamp(zoomScale(zoom), min_scale, max_scale);
     const double newWorldSize = newScale * util::tileSize;
     Bc = newWorldSize / util::DEGREES_MAX;
     Cc = newWorldSize / util::M2PI;
@@ -385,4 +385,16 @@ void TransformState::setScalePoint(const double newScale, const ScreenCoordinate
     Cc = Projection::worldSize(scale) / util::M2PI;
 }
 
+float TransformState::getCameraToTileDistance(const UnwrappedTileID& tileID) const {
+    mat4 projectionMatrix;
+    getProjMatrix(projectionMatrix);
+    mat4 tileProjectionMatrix;
+    matrixFor(tileProjectionMatrix, tileID);
+    matrix::multiply(tileProjectionMatrix, projectionMatrix, tileProjectionMatrix);
+    vec4 tileCenter = {{util::tileSize / 2, util::tileSize / 2, 0, 1}};
+    vec4 projectedCenter;
+    matrix::transformMat4(projectedCenter, tileCenter, tileProjectionMatrix);
+    return projectedCenter[3];
+}
+
 } // namespace mbgl