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#include <mbgl/style/layers/symbol_layer_impl.hpp>
#include <mbgl/util/logging.hpp>
namespace mbgl {
namespace style {
bool SymbolLayer::Impl::hasLayoutDifference(const Layer::Impl& other) const {
assert(other.type == LayerType::Symbol);
const auto& impl = static_cast<const style::SymbolLayer::Impl&>(other);
return filter != impl.filter ||
visibility != impl.visibility ||
layout != impl.layout ||
paint.hasDataDrivenPropertyDifference(impl.paint);
}
void SymbolLayer::Impl::populateFontStack(std::set<FontStack>& fontStack) const {
if (layout.get<TextField>().isUndefined()) {
return;
}
layout.get<TextFont>().match(
[&] (Undefined) {
fontStack.insert({"Open Sans Regular", "Arial Unicode MS Regular"});
},
[&] (const FontStack& constant) {
fontStack.insert(constant);
},
[&] (const auto& function) {
for (const auto& value : function.possibleOutputs()) {
if (value) {
fontStack.insert(*value);
} else {
Log::Warning(Event::ParseStyle, "Layer '%s' has an invalid value for text-font and will not render text. Output values must be contained as literals within the expression.", id.c_str());
break;
}
}
}
);
}
} // namespace style
} // namespace mbgl
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