From 164ad3375379f261fe3abed23846b39c3e798a9b Mon Sep 17 00:00:00 2001
From: Thomas Goyne <plorkyeran@aegisub.org>
Date: Mon, 12 May 2014 08:02:56 -0700
Subject: [PATCH] Fix RTL painting of the subtitles grid

wx comes very close to just making it work automatically, but it doesn't
translate the origin to the top-right corner and wxBufferedPaintDC
doesn't handle RTL at all, so reimplement it with some hacks.

Closes #1354.
---
 src/base_grid.cpp | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/base_grid.cpp b/src/base_grid.cpp
index 89ddb004a..a36902ffa 100644
--- a/src/base_grid.cpp
+++ b/src/base_grid.cpp
@@ -59,6 +59,39 @@
 #include <wx/scrolbar.h>
 #include <wx/sizer.h>
 
+namespace {
+#ifdef __WXMSW__
+class PaintDC : public wxBufferedDC {
+    wxPaintDC dc;
+
+public:
+    PaintDC(wxWindow *window) : dc(window) {
+		dc.SetLayoutDirection(wxLayout_LeftToRight);
+		Init(&dc, window->GetClientSize(), 0);
+		if (window->GetLayoutDirection() == wxLayout_RightToLeft) {
+			SetLayoutDirection(wxLayout_RightToLeft);
+			SetLogicalOrigin(GetSize().GetWidth(), 0);
+		}
+	}
+
+    ~PaintDC() {
+		SetLayoutDirection(wxLayout_LeftToRight);
+		SetLogicalOrigin(0, 0);
+		UnMask();
+	}
+
+	void Clear() {
+		auto origin = GetLogicalOrigin();
+		SetLogicalOrigin(0, 0);
+		wxBufferedDC::Clear();
+		SetLogicalOrigin(origin.x, origin.y);
+	}
+};
+#else
+typedef wxAutoBufferedPaintDC PaintDC;
+#endif
+}
+
 enum {
 	GRID_SCROLLBAR = 1730,
 	MENU_SHOW_COL = 1250 // Needs 15 IDs after this
@@ -279,7 +312,7 @@ void BaseGrid::OnPaint(wxPaintEvent &) {
 	GetClientSize(&w,&h);
 	w -= scrollBar->GetSize().GetWidth();
 
-	wxAutoBufferedPaintDC dc(this);
+	PaintDC dc(this);
 	dc.SetFont(font);
 
 	dc.SetBackground(row_colors.Default);