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-rw-r--r--src/mbgl/map/zoom_history.hpp37
1 files changed, 21 insertions, 16 deletions
diff --git a/src/mbgl/map/zoom_history.hpp b/src/mbgl/map/zoom_history.hpp
index 697e28573c..ddec53e6af 100644
--- a/src/mbgl/map/zoom_history.hpp
+++ b/src/mbgl/map/zoom_history.hpp
@@ -8,34 +8,39 @@ namespace mbgl {
struct ZoomHistory {
float lastZoom;
+ float lastFloorZoom;
float lastIntegerZoom;
TimePoint lastIntegerZoomTime;
bool first = true;
bool update(float z, const TimePoint& now) {
constexpr TimePoint zero = TimePoint(Duration::zero());
+ const float floorZ = std::floor(z);
+
if (first) {
first = false;
- lastIntegerZoom = std::floor(z);
+ lastIntegerZoom = floorZ;
lastIntegerZoomTime = zero;
lastZoom = z;
+ lastFloorZoom = floorZ;
+ return true;
+ }
+
+ if (lastFloorZoom > floorZ) {
+ lastIntegerZoom = floorZ + 1;
+ lastIntegerZoomTime = now == Clock::time_point::max() ? zero : now;
+ } else if (lastFloorZoom < floorZ || lastIntegerZoom != floorZ) {
+ lastIntegerZoom = floorZ;
+ lastIntegerZoomTime = now == Clock::time_point::max() ? zero : now;
+ }
+
+ if (z != lastZoom) {
+ lastZoom = z;
+ lastFloorZoom = floorZ;
return true;
- } else {
- if (std::floor(lastZoom) < std::floor(z)) {
- lastIntegerZoom = std::floor(z);
- lastIntegerZoomTime = now == Clock::time_point::max() ? zero : now;
- } else if (std::floor(lastZoom) > std::floor(z)) {
- lastIntegerZoom = std::floor(z + 1);
- lastIntegerZoomTime = now == Clock::time_point::max() ? zero : now;
- }
-
- if (z != lastZoom) {
- lastZoom = z;
- return true;
- }
-
- return false;
}
+
+ return false;
}
};