Add Image::mipmap to support mipmapping of images.

[ChangeLog][QtQuick] New feature: Image.mipmap

Task-number: QTBUG-19961

Change-Id: I13acb2408d5b126790adaf9d324ad4beda1e3646
Reviewed-by: Michael Brasser <michael.brasser@live.com>

4 files changed, 78 insertions, 0 deletions

diff --git a/tests/auto/quick/scenegraph/data/mipmap_large.png b/tests/auto/quick/scenegraph/data/mipmap_large.png
new file mode 100644
index 0000000000..9cb0fc7de1
--- /dev/null
+++ b/tests/auto/quick/scenegraph/data/mipmap_large.png
diff --git a/tests/auto/quick/scenegraph/data/mipmap_small.png b/tests/auto/quick/scenegraph/data/mipmap_small.png
new file mode 100644
index 0000000000..dc5216fb6c
--- /dev/null
+++ b/tests/auto/quick/scenegraph/data/mipmap_small.png
diff --git a/tests/auto/quick/scenegraph/data/render_Mipmap.qml b/tests/auto/quick/scenegraph/data/render_Mipmap.qml
new file mode 100644
index 0000000000..0a6195fc1f
--- /dev/null
+++ b/tests/auto/quick/scenegraph/data/render_Mipmap.qml
@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.3
+
+/*
+    The test verifies that scaled down mipmapped images contains
+    colors from all pixels.
+
+    #samples: 2
+                 PixelPos     R    G    B    Error-tolerance
+    #final:        0   0     0.33 0.33 0.33        0.1
+    #final:        1   0     0.33 0.33 0.33        0.1
+*/
+
+RenderTestBase
+{
+    Image {
+        x: 0
+        y: 0
+        transformOrigin: Item.TopLeft
+        source: "mipmap_small.png"
+        mipmap: true
+        smooth: false
+        scale: 1 / width;
+    }
+
+    Image {
+        x: 1
+        y: 0
+        transformOrigin: Item.TopLeft
+        source: "mipmap_large.png"
+        mipmap: true
+        smooth: false
+        scale: 1 / width;
+    }
+
+    onEnterFinalStage: finalStageComplete = true;
+}
diff --git a/tests/auto/quick/scenegraph/tst_scenegraph.cpp b/tests/auto/quick/scenegraph/tst_scenegraph.cpp
index 780d5a97db..af5acde5f3 100644
--- a/tests/auto/quick/scenegraph/tst_scenegraph.cpp
+++ b/tests/auto/quick/scenegraph/tst_scenegraph.cpp
@@ -326,6 +326,7 @@ void tst_SceneGraph::render_data()
           << "data/render_BreakOpacityBatch.qml"
           << "data/render_OutOfFloatRange.qml"
           << "data/render_StackingOrder.qml"
+          << "data/render_Mipmap.qml"
         ;
 
     QRegExp sampleCount("#samples: *(\\d+)");