Add API for reading and decoding graphical texture files

Add a framework for reading and decoding stored graphical texture file
formats. Includes decoders for the PKM and KTX formats.

This is basically the same texture file reading that was added to
qtdeclarative for 5.11, but has been refactored to be independent of
the scenegraph and opengl.

Task-number: QTBUG-67026
Change-Id: I87d8117550d8a2112f4f58c03e9ac6b3249cbc5a
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

6 files changed, 109 insertions, 1 deletions

diff --git a/tests/auto/gui/util/qtexturefilereader/qtexturefilereader.pro b/tests/auto/gui/util/qtexturefilereader/qtexturefilereader.pro
new file mode 100644
index 0000000000..43951fe722
--- /dev/null
+++ b/tests/auto/gui/util/qtexturefilereader/qtexturefilereader.pro
@@ -0,0 +1,5 @@
+CONFIG += testcase
+QT += testlib gui-private
+SOURCES += tst_qtexturefilereader.cpp
+TARGET = tst_qtexturefilereader
+RESOURCES += qtexturefilereader.qrc
diff --git a/tests/auto/gui/util/qtexturefilereader/qtexturefilereader.qrc b/tests/auto/gui/util/qtexturefilereader/qtexturefilereader.qrc
new file mode 100644
index 0000000000..74f33d57ad
--- /dev/null
+++ b/tests/auto/gui/util/qtexturefilereader/qtexturefilereader.qrc
@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>texturefiles/car.ktx</file>
+        <file>texturefiles/pattern.pkm</file>
+    </qresource>
+</RCC>
diff --git a/tests/auto/gui/util/qtexturefilereader/texturefiles/car.ktx b/tests/auto/gui/util/qtexturefilereader/texturefiles/car.ktx
new file mode 100644
index 0000000000..2aefdd306b
--- /dev/null
+++ b/tests/auto/gui/util/qtexturefilereader/texturefiles/car.ktx
diff --git a/tests/auto/gui/util/qtexturefilereader/texturefiles/pattern.pkm b/tests/auto/gui/util/qtexturefilereader/texturefiles/pattern.pkm
new file mode 100644
index 0000000000..d986e89b2d
--- /dev/null
+++ b/tests/auto/gui/util/qtexturefilereader/texturefiles/pattern.pkm
diff --git a/tests/auto/gui/util/qtexturefilereader/tst_qtexturefilereader.cpp b/tests/auto/gui/util/qtexturefilereader/tst_qtexturefilereader.cpp
new file mode 100644
index 0000000000..f480184067
--- /dev/null
+++ b/tests/auto/gui/util/qtexturefilereader/tst_qtexturefilereader.cpp
@@ -0,0 +1,97 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qtexturefilereader_p.h>
+#include <QtTest>
+
+class tst_qtexturefilereader : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void checkHandlers_data();
+    void checkHandlers();
+};
+
+void tst_qtexturefilereader::checkHandlers_data()
+{
+    QTest::addColumn<QString>("fileName");
+    QTest::addColumn<QSize>("size");
+    QTest::addColumn<quint32>("glFormat");
+    QTest::addColumn<quint32>("glInternalFormat");
+    // todo: glBaseInternalFormat
+    QTest::addColumn<int>("levels");
+    QTest::addColumn<int>("dataOffset");
+    QTest::addColumn<int>("dataLength");
+
+    QTest::addRow("pattern.pkm") << QStringLiteral(":/texturefiles/pattern.pkm")
+                                 << QSize(64, 64)
+                                 << quint32(0x0)
+                                 << quint32(0x8d64)
+                                 << 1
+                                 << 16
+                                 << 2048;
+
+    QTest::addRow("car.ktx") << QStringLiteral(":/texturefiles/car.ktx")
+                             << QSize(146, 80)
+                             << quint32(0x0)
+                             << quint32(0x9278)
+                             << 1
+                             << 68
+                             << 11840;
+}
+
+void tst_qtexturefilereader::checkHandlers()
+{
+    QFETCH(QString, fileName);
+    QFETCH(QSize, size);
+    QFETCH(quint32, glFormat);
+    QFETCH(quint32, glInternalFormat);
+    QFETCH(int, levels);
+    QFETCH(int, dataOffset);
+    QFETCH(int, dataLength);
+
+    QFile f(fileName);
+    QVERIFY(f.open(QIODevice::ReadOnly));
+    QTextureFileReader r(&f, fileName);
+    QVERIFY(r.canRead());
+
+    QTextureFileData tex = r.read();
+    QVERIFY(!tex.isNull());
+    QVERIFY(tex.isValid());
+    QCOMPARE(tex.size(), size);
+    QCOMPARE(tex.glFormat(), glFormat);
+    QCOMPARE(tex.glInternalFormat(), glInternalFormat);
+    QCOMPARE(tex.numLevels(), levels);
+    QCOMPARE(tex.dataOffset(), dataOffset);
+    QCOMPARE(tex.dataLength(), dataLength);
+}
+
+QTEST_MAIN(tst_qtexturefilereader)
+
+#include "tst_qtexturefilereader.moc"
diff --git a/tests/auto/gui/util/util.pro b/tests/auto/gui/util/util.pro
index 940e892e5f..2789ffb55d 100644
--- a/tests/auto/gui/util/util.pro
+++ b/tests/auto/gui/util/util.pro
@@ -10,4 +10,4 @@ SUBDIRS= \
     qshadergraphloader \
     qshadernodes \
     qshadernodesloader \
-
+    qtexturefilereader