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, 5 insertions, 5 deletions

diff --git a/src/gui/guiButtonImage.h b/src/gui/guiButtonImage.h
index 59a25b4f0..554934518 100644
--- a/src/gui/guiButtonImage.h
+++ b/src/gui/guiButtonImage.h
@@ -21,6 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "guiButton.h"
 #include "IGUIButton.h"
+#include "guiAnimatedImage.h"
 
 using namespace irr;
 
@@ -32,12 +33,11 @@ public:
 			s32 id, core::rect<s32> rectangle, ISimpleTextureSource *tsrc,
 			bool noclip = false);
 
-	void setForegroundImage(video::ITexture *image = nullptr);
+	void setForegroundImage(video::ITexture *image = nullptr,
+			const core::rect<s32> &middle = core::rect<s32>());
 
 	//! Set element properties from a StyleSpec
-	virtual void setFromStyle(const StyleSpec& style) override;
-
-	virtual void setScaleImage(bool scaleImage=true) override;
+	virtual void setFromStyle(const StyleSpec &style) override;
 
 	//! Do not drop returned handle
 	static GUIButtonImage *addButton(gui::IGUIEnvironment *environment,
@@ -47,5 +47,5 @@ public:
 
 private:
 	video::ITexture *m_foreground_image = nullptr;
-	gui::IGUIImage *m_image;
+	GUIAnimatedImage *m_image;
 };