Testlib: Format QRegion in QCOMPARE

Output regions as a compact list of rectangles:
QRegion(2 rectangles, 50x200+100+200, 200x50+10+10)

Change-Id: I62e42bd30897a1d31b28e0cbd6afe7fa8ecf2664
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/testlib/qtest_gui.h b/src/testlib/qtest_gui.h
index 5027aea732..d0d56e7bd0 100644
--- a/src/testlib/qtest_gui.h
+++ b/src/testlib/qtest_gui.h
@@ -58,6 +58,7 @@
 #include <QtGui/qcolor.h>
 #include <QtGui/qpixmap.h>
 #include <QtGui/qimage.h>
+#include <QtGui/qregion.h>
 
 #ifdef QT_WIDGETS_LIB
 #include <QtGui/qicon.h>
@@ -82,6 +83,39 @@ template<> inline char *toString(const QColor &color)
     return qstrdup(color.name().toLocal8Bit().constData());
 }
 
+template<> inline char *toString(const QRegion &region)
+{
+    QByteArray result = "QRegion(";
+    if (region.isNull()) {
+        result += "null";
+    } else if (region.isEmpty()) {
+        result += "empty";
+    } else {
+        const QVector<QRect> &rects = region.rects();
+        const int rectCount = rects.size();
+        if (rectCount > 1) {
+            result += QByteArray::number(rectCount);
+            result += " rectangles, ";
+        }
+        for (int i = 0; i < rectCount; ++i) {
+            if (i)
+                result += ", ";
+            const QRect &r = rects.at(i);
+            result += QByteArray::number(r.width());
+            result += 'x';
+            result += QByteArray::number(r.height());
+            if (r.x() >= 0)
+                result += '+';
+            result += QByteArray::number(r.x());
+            if (r.y() >= 0)
+                result += '+';
+            result += QByteArray::number(r.y());
+        }
+    }
+    result += ')';
+    return qstrdup(result.constData());
+}
+
 inline bool qCompare(QIcon const &t1, QIcon const &t2, const char *actual, const char *expected,
                     const char *file, int line)
 {