From 60544ac56f13132ef24ce38024627a127f7f15f0 Mon Sep 17 00:00:00 2001
From: Hugues Ross <hugues.ross@gmail.com>
Date: Sun, 26 Jan 2020 14:35:26 -0500
Subject: Add 9-slice background support to button formspec elements (#9290)

---
 src/gui/guiButton.cpp | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'src/gui/guiButton.cpp')

diff --git a/src/gui/guiButton.cpp b/src/gui/guiButton.cpp
index f7a0af2d9..4c16ee237 100644
--- a/src/gui/guiButton.cpp
+++ b/src/gui/guiButton.cpp
@@ -307,10 +307,25 @@ void GUIButton::draw()
 			}
 		}
 
-		driver->draw2DImage(ButtonImages[(u32)imageState].Texture,
-				ScaleImage? AbsoluteRect : core::rect<s32>(pos, sourceRect.getSize()),
-				sourceRect, &AbsoluteClippingRect,
-				0, UseAlphaChannel);
+		// PATCH
+		video::ITexture* texture = ButtonImages[(u32)imageState].Texture;
+		if (BgMiddle.getArea() == 0) {
+			driver->draw2DImage(texture,
+					ScaleImage? AbsoluteRect : core::rect<s32>(pos, sourceRect.getSize()),
+					sourceRect, &AbsoluteClippingRect,
+					0, UseAlphaChannel);
+		} else {
+			core::rect<s32> middle = BgMiddle;
+			// `-x` is interpreted as `w - x`
+			if (middle.LowerRightCorner.X < 0)
+				middle.LowerRightCorner.X += texture->getOriginalSize().Width;
+			if (middle.LowerRightCorner.Y < 0)
+				middle.LowerRightCorner.Y += texture->getOriginalSize().Height;
+			draw2DImage9Slice(driver, texture,
+					ScaleImage ? AbsoluteRect : core::rect<s32>(pos, sourceRect.getSize()),
+					middle, &AbsoluteClippingRect);
+		}
+		// END PATCH
 	}
 
 	if (SpriteBank)
@@ -804,5 +819,6 @@ void GUIButton::setFromStyle(const StyleSpec& style, ISimpleTextureSource *tsrc)
 					Environment->getVideoDriver(), pressed_texture, geom.X, geom.Y));
 		setScaleImage(true);
 	}
+	BgMiddle = style.getRect(StyleSpec::BGIMG_MIDDLE, BgMiddle);
 }
 // END PATCH
-- 
cgit v1.2.3