From 61fced375a202dbf48ceb22153c2976d91ad989b Mon Sep 17 00:00:00 2001
From: Tang HaiXiang <tanghaixiang@uniontech.com>
Date: Mon, 06 Jul 2020 14:27:49 +0800
Subject: [PATCH] Fix gif parsing error for large images

A very large GIF image resulted in cropping of image updates, due to
the handler trying to protect against very large values.

Increase that size from 200 to 16384, which is also the value used
in the withinSizeLimit method.

Fixes: QTBUG-85340
Pick-to: 5.15
Change-Id: I70888d76b378ee4f49694e90d7d753fae817ff2a
Reviewed-by: Lu YaNing <luyaning@uniontech.com>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
---

diff --git a/src/plugins/imageformats/gif/qgifhandler.cpp b/src/plugins/imageformats/gif/qgifhandler.cpp
index b6322f0..23a768e 100644
--- a/src/plugins/imageformats/gif/qgifhandler.cpp
+++ b/src/plugins/imageformats/gif/qgifhandler.cpp
@@ -342,9 +342,9 @@
 
                 // disbelieve ridiculous logical screen sizes,
                 // unless the image frames are also large.
-                if (swidth/10 > qMax(newwidth,200))
+                if (swidth/10 > qMax(newwidth,16384))
                     swidth = -1;
-                if (sheight/10 > qMax(newheight,200))
+                if (sheight/10 > qMax(newheight,16384))
                     sheight = -1;
 
                 if (swidth <= 0)