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, 13 insertions, 0 deletions

diff --git a/tests/auto/qimagereader/tst_qimagereader.cpp b/tests/auto/qimagereader/tst_qimagereader.cpp
index 18900b4..1403280 100644
--- a/tests/auto/qimagereader/tst_qimagereader.cpp
+++ b/tests/auto/qimagereader/tst_qimagereader.cpp
@@ -136,6 +136,7 @@ private slots:
 
 #if defined QTEST_HAVE_GIF
     void gifHandlerBugs();
+    void animatedGif();
 #endif
 
     void readCorruptImage_data();
@@ -671,6 +672,18 @@ void tst_QImageReader::gifHandlerBugs()
         QCOMPARE(im1.convertToFormat(QImage::Format_ARGB32), im2.convertToFormat(QImage::Format_ARGB32));
     }
 }
+
+void tst_QImageReader::animatedGif()
+{
+    QImageReader io(prefix + "qt.gif");
+    QImage image= io.read();
+    int i=0;
+    while(!image.isNull()){
+        QString frameName = QString(prefix + "qt%1.gif").arg(++i);
+        QCOMPARE(image, QImage(frameName));
+        image=io.read();
+    }
+}
 #endif
 
 class Server : public QObject