[core] Don't upload the FrameHistory texture in frames where it's not changing

1 files changed, 6 insertions, 6 deletions

diff --git a/src/mbgl/renderer/frame_history.cpp b/src/mbgl/renderer/frame_history.cpp
index a933a9004a..35e246f488 100644
--- a/src/mbgl/renderer/frame_history.cpp
+++ b/src/mbgl/renderer/frame_history.cpp
@@ -39,15 +39,15 @@ void FrameHistory::record(const TimePoint& now, float zoom, const Duration& dura
     for (int16_t z = 0; z <= 255; z++) {
         std::chrono::duration<float> timeDiff = now - changeTimes[z];
         int32_t opacityChange = (duration == Milliseconds(0) ? 1 : (timeDiff / duration)) * 255;
-        if (z <= zoomIndex) {
-            opacities.data[z] = util::min(255, changeOpacities[z] + opacityChange);
-        } else {
-            opacities.data[z] = util::max(0, changeOpacities[z] - opacityChange);
+        uint8_t opacity = z <= zoomIndex
+            ? util::min(255, changeOpacities[z] + opacityChange)
+            : util::max(0, changeOpacities[z] - opacityChange);
+        if (opacities.data[z] != opacity) {
+            opacities.data[z] = opacity;
+            dirty = true;
         }
     }
 
-    dirty = true;
-
     if (zoomIndex != previousZoomIndex) {
         previousZoomIndex = zoomIndex;
         previousTime = now;