From 5c9c05ebe74fee16b8c84416fed754a507bb3fbf Mon Sep 17 00:00:00 2001
From: David Capello <davidcapello@gmail.com>
Date: Thu, 27 Nov 2014 23:48:53 -0300
Subject: [PATCH] Fix problems because excessive zoom out

* Crash when the checked background is too small
* Infinite loop to draw the grid
---
 src/app/ui/editor/editor.cpp | 2 ++
 src/app/util/render.cpp      | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/src/app/ui/editor/editor.cpp b/src/app/ui/editor/editor.cpp
index 3affe2a0a..623bed330 100644
--- a/src/app/ui/editor/editor.cpp
+++ b/src/app/ui/editor/editor.cpp
@@ -666,6 +666,8 @@ void Editor::drawGrid(Graphics* g, const gfx::Rect& spriteBounds, const Rect& gr
 
   // Convert the "grid" rectangle to screen coordinates
   grid = editorToScreen(grid);
+  if (grid.w < 1 || grid.h < 1)
+    return;
 
   // Adjust for client area
   gfx::Rect bounds = getBounds();
diff --git a/src/app/util/render.cpp b/src/app/util/render.cpp
index 51cba6c5e..152941183 100644
--- a/src/app/util/render.cpp
+++ b/src/app/util/render.cpp
@@ -613,6 +613,9 @@ void RenderEngine::renderCheckedBackground(Image* image,
   if (tile_w < zoom.apply(1)) tile_w = zoom.apply(1);
   if (tile_h < zoom.apply(1)) tile_h = zoom.apply(1);
 
+  if (tile_w < 1) tile_w = 1;
+  if (tile_h < 1) tile_h = 1;
+
   // Tile position (u,v) is the number of tile we start in (source_x,source_y) coordinate
   u = (source_x / tile_w);
   v = (source_y / tile_h);