From 827f34124d881008205f7f2579779eee5685996a Mon Sep 17 00:00:00 2001
From: shun-iwasawa <shun-iwasawa@users.noreply.github.com>
Date: Mar 08 2017 03:33:35 +0000
Subject: fix preview fx (#1073)


close #1072 

---

diff --git a/toonz/sources/toonz/previewfxmanager.cpp b/toonz/sources/toonz/previewfxmanager.cpp
index 0e0e647..9f4c5fc 100644
--- a/toonz/sources/toonz/previewfxmanager.cpp
+++ b/toonz/sources/toonz/previewfxmanager.cpp
@@ -994,8 +994,13 @@ void PreviewFxRenderPort::onRenderRasterStarted(
 
 void PreviewFxRenderPort::onRenderRasterCompleted(
     const RenderData &renderData) {
-  /*-- 計算の途中でキャンセルされた場合、結果を出さない --*/
-  if (renderData.m_info.m_isCanceled && *renderData.m_info.m_isCanceled) return;
+  /*-- Do not show the result if canceled while rendering --*/
+  if (renderData.m_info.m_isCanceled && *renderData.m_info.m_isCanceled) {
+    // set m_renderFailed to true in order to prevent updating
+    // m_overallRenderedRegion at PreviewFxInstance::onRenderFinished().
+    m_owner->m_renderFailed = true;
+    return;
+  }
 
   m_owner->onRenderRasterCompleted(renderData);
 }