Add animated_image[] formspec element (#9258)

src/gui/guiAnimatedImage.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "irrlichttypes_extrabloated.h"
+#include "util/string.h"
+
+class ISimpleTextureSource;
+
+class GUIAnimatedImage : public gui::IGUIElement {
+public:
+	GUIAnimatedImage(gui::IGUIEnvironment *env, gui::IGUIElement *parent, s32 id,
+			const core::rect<s32> &rectangle, const std::string &name,
+			ISimpleTextureSource *tsrc);
+
+	virtual void draw() override;
+
+private:
+	std::string m_name;
+	ISimpleTextureSource *m_tsrc;
+
+	video::ITexture *m_texture;
+	u64 m_global_time;
+	s32 m_frame_idx;
+	s32 m_frame_count;
+	u64 m_frame_duration;
+	u64 m_frame_time;
+};