Add new Lua function to query size of an image

src/engine/openspaceengine.cpp

@@ -1738,6 +1738,7 @@ scripting::LuaLibrary OpenSpaceEngine::luaLibrary() {
             codegen::lua::RemoveTag,
             codegen::lua::DownloadFile,
             codegen::lua::CreateSingleColorImage,
+            codegen::lua::ImageSize,
             codegen::lua::SaveBase64File,
             codegen::lua::IsMaster,
             codegen::lua::Version,

src/engine/openspaceengine_lua.inl

@@ -34,6 +34,7 @@
 #include <ghoul/filesystem/cachemanager.h>
 #include <ghoul/filesystem/filesystem.h>
 #include <ghoul/glm.h>
+#include <ghoul/io/texture/texturereader.h>
 #include <ghoul/io/texture/texturewriter.h>
 #include <ghoul/logging/logmanager.h>
 #include <ghoul/lua/lua_helper.h>
@@ -209,6 +210,16 @@ namespace {
     return fileName;
 }
 
+/**
+ * This function returns the size in pixels of an image file.
+ *
+ * \param path The location of the image file for which the pixel size will be returned
+ * \return The size of the image in pixels
+ */
+[[codegen::luawrap]] glm::ivec2 imageSize(std::filesystem::path path) {
+    return ghoul::io::TextureReader::ref().imageSize(path);
+}
+
 /**
  * This function takes a base64 encoded data string, decodes it and saves the resulting
  * data to the provided filepath.