GUI: sample editor keybinds

works

src/gui/sampleUtil.h

@@ -0,0 +1,31 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define SAMPLE_OP_BEGIN \
+  unsigned int start=0; \
+  unsigned int end=sample->samples; \
+  if (sampleSelStart!=-1 && sampleSelEnd!=-1 && sampleSelStart!=sampleSelEnd) { \
+    start=sampleSelStart; \
+    end=sampleSelEnd; \
+    if (start>end) { \
+      start^=end; \
+      end^=start; \
+      start^=end; \
+    } \
+  }