Fixes the gif plugin's rendering for some animated gif files.

In the case of optimized animated gifs, we don't want to discard
the contents of the previous frame, this is handled if needed in the
disposal process.

Task-number: 247365
Reviewed-by: Samuel

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/imageformats/gif/qgifhandler.cpp b/src/plugins/imageformats/gif/qgifhandler.cpp
index de985d8736..0f6a34995a 100644
--- a/src/plugins/imageformats/gif/qgifhandler.cpp
+++ b/src/plugins/imageformats/gif/qgifhandler.cpp
@@ -234,7 +234,7 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
 
 #define LM(l, m) (((m)<<8)|l)
     digress = false;
-    int initial = length;
+    const int initial = length;
     while (!digress && length) {
         length--;
         unsigned char ch=*buffer++;
@@ -333,7 +333,7 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
                     sheight = newtop + newheight;
 
                 QImage::Format format = trans_index >= 0 ? QImage::Format_ARGB32 : QImage::Format_RGB32;
-                if (image->isNull() || (image->size() != QSize(swidth, sheight)) || image->format() != format) {
+                if (image->isNull()) {
                     (*image) = QImage(swidth, sheight, format);
                     memset(image->bits(), 0, image->numBytes());