From cd42a8b9f38f62816e5418aecdebc63c7faefae0 Mon Sep 17 00:00:00 2001
From: tildearrow <tildearrow@protonmail.com>
Date: Sun, 13 Mar 2022 02:36:52 -0500
Subject: [PATCH] GUI: implement flip

---
 src/gui/gui.cpp | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 2220299f8..3b77476d6 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -3330,6 +3330,31 @@ void FurnaceGUI::doFlip() {
   finishSelection();
   prepareUndo(GUI_UNDO_PATTERN_FLIP);
 
+  DivPattern patBuffer;
+  int iCoarse=selStart.xCoarse;
+  int iFine=selStart.xFine;
+  int ord=e->getOrder();
+  for (; iCoarse<=selEnd.xCoarse; iCoarse++) {
+    if (!e->song.chanShow[iCoarse]) continue;
+    DivPattern* pat=e->song.pat[iCoarse].getPattern(e->song.orders.ord[iCoarse][ord],true);
+    for (; iFine<3+e->song.pat[iCoarse].effectRows*2 && (iCoarse<selEnd.xCoarse || iFine<=selEnd.xFine); iFine++) {
+      maskOut(iFine);
+      for (int j=selStart.y; j<=selEnd.y; j++) {
+        if (iFine==0) {
+          patBuffer.data[j][0]=pat->data[j][0];
+        }
+        patBuffer.data[j][iFine+1]=pat->data[j][iFine+1];
+      }
+      for (int j=selStart.y; j<=selEnd.y; j++) {
+        if (iFine==0) {
+          pat->data[j][0]=patBuffer.data[selEnd.y-j+selStart.y][0];
+        }
+        pat->data[j][iFine+1]=patBuffer.data[selEnd.y-j+selStart.y][iFine+1];
+      }
+    }
+    iFine=0;
+  }
+
   makeUndo(GUI_UNDO_PATTERN_FLIP);
 }