Fix save_png definition / New UISprite function

src/client/luafunctions.cpp

@@ -621,6 +621,7 @@ void Client::registerLuaFunctions()
     g_lua.bindClassMemberFunction<UISprite>("clearSprite", &UISprite::clearSprite);
     g_lua.bindClassMemberFunction<UISprite>("getSpriteId", &UISprite::getSpriteId);
     g_lua.bindClassMemberFunction<UISprite>("setSpriteColor", &UISprite::setSpriteColor);
+    g_lua.bindClassMemberFunction<UISprite>("hasSprite", &UISprite::hasSprite);
 
     g_lua.registerClass<UICreature, UIWidget>();
     g_lua.bindClassStaticFunction<UICreature>("create", []{ return UICreaturePtr(new UICreature); } );

src/client/uisprite.h

@@ -41,6 +41,8 @@ public:
     bool isSpriteVisible() { return m_spriteVisible; }
     void setSpriteVisible(bool visible) { m_spriteVisible = visible; }
 
+    bool hasSprite() { return m_sprite != nullptr; }
+
 protected:
     void onStyleApply(const std::string& styleName, const OTMLNodePtr& styleNode);
 

src/framework/graphics/apngloader.h

@@ -40,7 +40,7 @@ struct apng_data {
 
 // returns -1 on error, 0 on success
 int load_apng(std::stringstream& file, struct apng_data *apng);
-void save_png(std::stringstream& file, int width, int height, int channels, unsigned char *pixels);
+void save_png(std::stringstream& file, unsigned int width, unsigned int height, int channels, unsigned char *pixels);
 void free_apng(struct apng_data *apng);
 
 #endif