QImage plugins should report supported mime types

Introduces the methods QImageReader::supportedMimeTypes and
QImageWriter::supportedMimeTypes which corresponds to the similar
supportedImageFormats methods, except they return lists of MIME types.

Task-number: QTBUG-28177
Change-Id: Ibb0e264a12eaf972a8bfd6bd891dcd9f89efd085
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp b/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp
index 10d850ccb8..24f0da7da8 100644
--- a/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp
+++ b/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp
@@ -94,6 +94,7 @@ private slots:
     void multiWordNamedColorXPM();
 
     void supportedFormats();
+    void supportedMimeTypes();
 
     void readFromDevice_data();
     void readFromDevice();
@@ -570,6 +571,26 @@ void tst_QImageReader::supportedFormats()
     QCOMPARE(formatSet.size(), formats.size());
 }
 
+void tst_QImageReader::supportedMimeTypes()
+{
+    QList<QByteArray> mimeTypes = QImageReader::supportedMimeTypes();
+    QList<QByteArray> sortedMimeTypes = mimeTypes;
+    qSort(sortedMimeTypes);
+
+    // check that the list is sorted
+    QCOMPARE(mimeTypes, sortedMimeTypes);
+
+    QSet<QByteArray> mimeTypeSet;
+    foreach (QByteArray mimeType, mimeTypes)
+        mimeTypeSet << mimeType;
+
+    // check the list as a minimum contains image/bmp
+    QVERIFY(mimeTypeSet.contains("image/bmp"));
+
+    // check that the list does not contain duplicates
+    QCOMPARE(mimeTypeSet.size(), mimeTypes.size());
+}
+
 void tst_QImageReader::setBackgroundColor_data()
 {
     QTest::addColumn<QString>("fileName");