File _service:tar_git:0007-Don-t-decode-all-images-on-shell-activation-if-decod.patch of Package xulrunner-qt5

From 99e5da5d69b1dfbd8ae728e8dd40af416c59d094 Mon Sep 17 00:00:00 2001
From: Piotr Tworek <piotr.tworek@jollamobile.com>
Date: Fri, 3 Jul 2015 14:12:32 +0200
Subject: [PATCH 07/15] Don't decode all images on shell activation if
 decodeondraw is enabled. Fixes JB#25287

Currently if the page contains a lot images in nsDocument::mImageTracker
they will be all decoded when nsDocument::SetImageLockingState(true).
This seems to be an unwanted behaviour when image.mem.decodeondraw pref
is enabled. In such case the images should be decoded just before being
painted. Since some of the images may not be even visible, we don't want to
waste memory for the decoded data.

The original fix for the problem disabled image locking completely.
Unfortunately this cused regressions on pages like jolla.com/tablet (see
JB#30305).

Signed-off-by: Raine Makelainen <raine.makelainen@jolla.com>
---
 dom/base/nsDocument.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 47f611e..c45d949 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -10580,7 +10580,9 @@ PLDHashOperator LockEnumerator(imgIRequest* aKey,
                                void*    userArg)
 {
   aKey->LockImage();
-  aKey->RequestDecode();
+  if (!Preferences::GetBool("image.mem.decodeondraw", false)) {
+    aKey->RequestDecode();
+  }
   return PL_DHASH_NEXT;
 }
 
-- 
2.1.4