[core] Add changes to respect minzoom and maxzoom

This adds only the changes made in
https://github.com/mapbox/mapbox-gl-native/pull/5828 to address the
issue where the style zoom levels were not respected when deciding
when to render a layer.

src/mbgl/style/layer_impl.cpp

@@ -11,9 +11,12 @@ bool Layer::Impl::hasRenderPass(RenderPass pass) const {
     return bool(passes & pass);
 }
 
-bool Layer::Impl::needsRendering() const {
-    return passes != RenderPass::None && visibility != VisibilityType::None;
-}
+bool Layer::Impl::needsRendering(float zoom) const {
+        return passes != RenderPass::None
+        && visibility != VisibilityType::None
+        && minZoom <= zoom
+        && maxZoom >= zoom;
+    }
 
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layer_impl.hpp

@@ -59,7 +59,7 @@ public:
     bool hasRenderPass(RenderPass) const;
 
     // Checks whether this layer can be rendered.
-    bool needsRendering() const;
+    bool needsRendering(float zoom) const;
 
     virtual float getQueryRadius() const { return 0; }
     virtual bool queryIntersectsGeometry(

src/mbgl/style/style.cpp

@@ -212,7 +212,7 @@ void Style::recalculate(float z, const TimePoint& timePoint, MapMode mode) {
         hasPendingTransitions |= layer->baseImpl->recalculate(parameters);
 
         Source* source = getSource(layer->baseImpl->source);
-        if (source && layer->baseImpl->needsRendering()) {
+        if (source && layer->baseImpl->needsRendering(z)) {
             source->enabled = true;
             if (!source->loaded && !source->isLoading()) {
                 source->load(fileSource);