[core] Implement image expression (#15877)

* [core] Bump gl-js version
* [core] Implement image expression
* [core] Use new image expression
* [core] Coerce image expression to / from string
* [core] Serialize evaluated image
* [core] Pass available images to layout
* [core] Pass images to evaluation context
* [core] Set available flag value based on image availability
* [core] Allow image coercion to boolean to indicate image availability
* [core] Coalesce image expression
* [core] Add image expression to next build system
* [core] Align serialization format and evaluated type with gl-js
* [core] Add images to expression evaluation method
* [core] Add support for Image expression to expression test runner
* [core] Unskip image expression tests
* [core] Update unit tests
* [core] Use image expression in annotation manager
* [core] Add string to ImageExpression conversion
* [core] Add image expression to expression dsl
* [core] Convert tokens for implicitly created Image literal
* [core] Fix clang format
* [core] Split generated style code lines that are over 120 characters
* [core] Add unit test for image expression equality
* [core] Add image property expression evaluation unit test
* [core] Unskip image expression render test
* [core] Skip 'in' expression tests
* [core] Ignore fill-pattern/update-feature-state render test
* [core] Rename Image::serialize to Image::toValue

1 files changed, 3 insertions, 3 deletions

diff --git a/include/mbgl/style/layers/background_layer.hpp b/include/mbgl/style/layers/background_layer.hpp
index ebdce35d0f..bc9d5222fd 100644
--- a/include/mbgl/style/layers/background_layer.hpp
+++ b/include/mbgl/style/layers/background_layer.hpp
@@ -40,9 +40,9 @@ public:
     void setBackgroundOpacityTransition(const TransitionOptions&);
     TransitionOptions getBackgroundOpacityTransition() const;
 
-    static PropertyValue<std::string> getDefaultBackgroundPattern();
-    const PropertyValue<std::string>& getBackgroundPattern() const;
-    void setBackgroundPattern(const PropertyValue<std::string>&);
+    static PropertyValue<expression::Image> getDefaultBackgroundPattern();
+    const PropertyValue<expression::Image>& getBackgroundPattern() const;
+    void setBackgroundPattern(const PropertyValue<expression::Image>&);
     void setBackgroundPatternTransition(const TransitionOptions&);
     TransitionOptions getBackgroundPatternTransition() const;