FormSpec: 9-slice images, animated_images, and fgimg_middle (#12453)

* FormSpec: 9-slice images and animated_images

* Add fgimg_middle; clean up code

* Address issues, add tests

* Fix stupid error; bump formspec version

* Re-add image[] elements without a size

1 files changed, 19 insertions, 6 deletions

diff --git a/src/gui/guiAnimatedImage.h b/src/gui/guiAnimatedImage.h
index f8e6a506e..885aedece 100644
--- a/src/gui/guiAnimatedImage.h
+++ b/src/gui/guiAnimatedImage.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "irrlichttypes_extrabloated.h"
+#include <algorithm>
 #include <string>
 
 class ISimpleTextureSource;
@@ -8,21 +9,33 @@ 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 &texture_name,
-		s32 frame_count, s32 frame_duration, ISimpleTextureSource *tsrc);
+		s32 id, const core::rect<s32> &rectangle);
 
 	virtual void draw() override;
 
-	void setFrameIndex(s32 frame);
+	void setTexture(video::ITexture *texture) { m_texture = texture; };
+	video::ITexture *getTexture() const { return m_texture; };
+
+	void setMiddleRect(const core::rect<s32> &middle) { m_middle = middle; };
+	core::rect<s32> getMiddleRect() const { return m_middle; };
+
+	void setFrameDuration(u64 duration) { m_frame_duration = duration; };
+	u64 getFrameDuration() const { return m_frame_duration; };
+
+	void setFrameCount(s32 count) { m_frame_count = std::max(count, 1); };
+	s32 getFrameCount() const { return m_frame_count; };
+
+	void setFrameIndex(s32 frame) { m_frame_idx = std::max(frame, 0); };
 	s32 getFrameIndex() const { return m_frame_idx; };
 
 private:
-	ISimpleTextureSource *m_tsrc;
-
 	video::ITexture *m_texture = nullptr;
+
 	u64 m_global_time = 0;
 	s32 m_frame_idx = 0;
 	s32 m_frame_count = 1;
-	u64 m_frame_duration = 1;
+	u64 m_frame_duration = 0;
 	u64 m_frame_time = 0;
+
+	core::rect<s32> m_middle;
 };