From 6e8713e25c12f0a7212e22ef5ccd6fa2d8ad93ae Mon Sep 17 00:00:00 2001
From: "Gregory.Shrago" <gregory.shrago@jetbrains.com>
Date: Tue, 30 Jun 2015 17:23:38 +0300
Subject: [PATCH] Wallpaper: do not eat cpu cycles if not configured

---
 .../intellij/openapi/wm/impl/IdeBackgroundUtil.java  |  4 ++--
 .../com/intellij/openapi/wm/impl/PaintersHelper.java | 12 +++++++++++-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/platform/platform-impl/src/com/intellij/openapi/wm/impl/IdeBackgroundUtil.java b/platform/platform-impl/src/com/intellij/openapi/wm/impl/IdeBackgroundUtil.java
index 021e7e76a3eb..2a1607e3655c 100644
--- a/platform/platform-impl/src/com/intellij/openapi/wm/impl/IdeBackgroundUtil.java
+++ b/platform/platform-impl/src/com/intellij/openapi/wm/impl/IdeBackgroundUtil.java
@@ -57,11 +57,11 @@ public class IdeBackgroundUtil {
   }
 
   public static void initEditorPainters(@NotNull PaintersHelper painters) {
-    painters.addPainter(PaintersHelper.newWallpaperPainter("idea.wallpaper.editor"), null);
+    PaintersHelper.initWallpaperPainter("idea.wallpaper.editor", painters);
   }
 
   public static void initFramePainters(@NotNull PaintersHelper painters) {
-    painters.addPainter(PaintersHelper.newWallpaperPainter("idea.wallpaper.ide"), null);
+    PaintersHelper.initWallpaperPainter("idea.wallpaper.ide", painters);
 
     ApplicationInfoEx appInfo = ApplicationInfoEx.getInstanceEx();
     String path = UIUtil.isUnderDarcula()? appInfo.getEditorBackgroundImageUrl() : null;
diff --git a/platform/platform-impl/src/com/intellij/openapi/wm/impl/PaintersHelper.java b/platform/platform-impl/src/com/intellij/openapi/wm/impl/PaintersHelper.java
index 264d9d6c71fb..dc56e5fa9715 100644
--- a/platform/platform-impl/src/com/intellij/openapi/wm/impl/PaintersHelper.java
+++ b/platform/platform-impl/src/com/intellij/openapi/wm/impl/PaintersHelper.java
@@ -120,7 +120,17 @@ final class PaintersHelper implements Painter.Listener {
     TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, BOTTOM_RIGHT
   }
 
-  public static AbstractPainter newWallpaperPainter(final String propertyName) {
+  public static void initWallpaperPainter(@NotNull String propertyName, @NotNull PaintersHelper painters) {
+    String value = System.getProperty(propertyName);
+    if (value == null && !new File(PathManager.getConfigPath(), propertyName + ".png").exists()) {
+      // property not set & there's no default
+      return;
+    }
+    ImagePainter painter = (ImagePainter)newWallpaperPainter(propertyName);
+    painters.addPainter(painter, null);
+  }
+
+  private static AbstractPainter newWallpaperPainter(@NotNull final String propertyName) {
     return new ImagePainter() {
       Image image;
       float alpha;