Android: Don't include Apache code under LGPLv2 license

The code which extracts style assets for the Android style
is licensed under the Apache license, which is not compatible
with LGPLv2.1. It is, however, compatible with LGPLv3. This
means that the Android platform plugin cannot be LGPLv2.1
as long as this code is included.

To minimize licensing confusion, we default to only providing
LGPLv3 for Android. If you want to build a LGPLv2.1-compatible
library, you can add -no-android-style-assets to the
configuration. This will in turn enable the LGPLv2.1 in
the configure output, and it will disable the extraction
code in the platform plugin.

Running the Android style with an LGPLv2.1-compatible platform
plugin will work, but it will look horrible.

[ChangeLog][Android] Default open-source license for
Qt for Android is now LGPLv3. For compatibility with the LGPLv2.1
license, add "-no-android-style-assets" to your configuration.

Change-Id: I6c7b52140f38138520871fa7c69debbb4ee90e6c
Task-number: QTBUG-41365
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Christian Stromme <christian.stromme@digia.com>

7 files changed, 154 insertions, 24 deletions

diff --git a/configure b/configure
index efcfd7b3bf..74ff31eb04 100755
--- a/configure
+++ b/configure
@@ -627,6 +627,7 @@ CFG_PPS=auto
 CFG_QNX_IMF=auto
 CFG_LGMON=auto
 CFG_SYSTEM_PROXIES=no
+CFG_ANDROID_STYLE_ASSETS=yes
 
 # Target architecture
 CFG_ARCH=
@@ -2144,6 +2145,13 @@ while [ "$#" -gt 0 ]; do
     android-toolchain-version)
         CFG_DEFAULT_ANDROID_NDK_TOOLCHAIN_VERSION="$VAL"
         ;;
+    android-style-assets)
+        if [ "$VAL" = "yes" ] || [ "$VAL" = "no" ]; then
+            CFG_ANDROID_STYLE_ASSETS="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
     l*)  # -lfoo
         if [ "$VAL" = "yes" ]; then
             L_FLAGS="$L_FLAGS -l\"${VAR#l}\""
@@ -2565,6 +2573,14 @@ Android options:
 
     -android-toolchain-version ..... Sets the android toolchain version
                                      (default $CFG_DEFAULT_ANDROID_NDK_TOOLCHAIN_VERSION)
+
+    -no-android-style-assets ....... Do not compile in the code which automatically extracts
+                                     style assets from the run-time device. Setting this will
+                                     make the Android style behave incorrectly, but will enable
+                                     compatibility with the LGPL2.1 license.
+ *  -android-style-assets .......... Compile the code which automatically extracts style assets
+                                     from the run-time device. This option will make the
+                                     Android platform plugin incompatible with the LGPL2.1.
 EOF
 
    exit 0
@@ -2826,11 +2842,20 @@ fi
 
 if [ "$Edition" = "OpenSource" ]; then
     while true; do
-        echo "You are licensed to use this software under the terms of"
-        echo "the Lesser GNU General Public License (LGPL) versions 2.1."
-        echo "You are also licensed to use this software under the terms of"
-        echo "the GNU Lesser General Public License (LGPL) versions 3."
-        affix="either"
+        if [ "$CFG_ANDROID_STYLE_ASSETS" = "no" ] || [ "$XPLATFORM_ANDROID" = "no" ]; then
+            echo "You are licensed to use this software under the terms of"
+            echo "the Lesser GNU General Public License (LGPL) versions 2.1."
+            echo "You are also licensed to use this software under the terms of"
+            echo "the GNU Lesser General Public License (LGPL) versions 3."
+            affix="either"
+            showLGPL2="yes"
+        else
+            echo "You are licensed to use this software under the terms of"
+            echo "the GNU Lesser General Public License (LGPL) versions 3."
+            showLGPL2="no"
+            affix="the"
+        fi
+
         echo
         if [ "$OPT_CONFIRM_LICENSE" = "yes" ]; then
             echo "You have already accepted the terms of the $EditionString license."
@@ -2839,7 +2864,9 @@ if [ "$Edition" = "OpenSource" ]; then
             if [ -f "$relpath/LICENSE.LGPLv3" ]; then
                 echo "Type '3' to view the GNU Lesser General Public License version 3."
             fi
-            echo "Type 'L' to view the Lesser GNU General Public License version 2.1."
+            if [ "$showLGPL2" = "yes" ]; then
+                echo "Type 'L' to view the Lesser GNU General Public License version 2.1."
+            fi
             echo "Type 'yes' to accept this license offer."
             echo "Type 'no' to decline this license offer."
             echo
@@ -2855,7 +2882,7 @@ if [ "$Edition" = "OpenSource" ]; then
             exit 1
         elif [ "$acceptance" = "3" ]; then
             more "$relpath/LICENSE.LGPLv3"
-        elif [ "$acceptance" = "L" ]; then
+        elif [ "$acceptance" = "L" ] && [ "$showLGPL2" = "yes" ]; then
             more "$relpath/LICENSE.LGPLv21"
         fi
     done
@@ -3167,6 +3194,9 @@ if [ "$XPLATFORM_ANDROID" = "yes" ] ; then
     esac
     QMAKE_CONF_COMPILER=$CFG_DEFAULT_ANDROID_NDK_ROOT/toolchains/$ANDROID_NDK_TOOLS_PREFIX-$CFG_DEFAULT_ANDROID_NDK_TOOLCHAIN_VERSION/prebuilt/$CFG_DEFAULT_ANDROID_NDK_HOST/bin/$ANDROID_NDK_TOOLS_PREFIX-g++
     TEST_COMPILER="$QMAKE_CONF_COMPILER --sysroot=$CFG_DEFAULT_ANDROID_NDK_ROOT/platforms/$CFG_DEFAULT_ANDROID_PLATFORM/$ANDROID_PLATFORM_ARCH/"
+    if [ "$CFG_ANDROID_STYLE_ASSETS" = "yes" ]; then
+        QMAKE_CONFIG="$QMAKE_CONFIG android-style-assets"
+    fi
 fi
 
 if [ "$XPLATFORM_SYMBIAN_SBSV2" = "no" ]; then
diff --git a/header.LGPL3 b/header.LGPL3
new file mode 100644
index 0000000000..d58f2fe2b2
--- /dev/null
+++ b/header.LGPL3
@@ -0,0 +1,28 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the FOO module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
diff --git a/src/android/jar/src/org/qtproject/qt5/android/ExtractStyle.java b/src/android/jar/src/org/qtproject/qt5/android/ExtractStyle.java
index 06b3dab0df..0eda08c9d9 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/ExtractStyle.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/ExtractStyle.java
@@ -761,6 +761,9 @@ public class ExtractStyle {
     private JSONObject getJsonChunkInfo(int[] chunkData) throws JSONException
     {
         JSONObject jsonRect = new JSONObject();
+        if (chunkData == null)
+            return jsonRect;
+
         jsonRect.put("xdivs", getJsonArray(chunkData, 3, chunkData[0]));
         jsonRect.put("ydivs", getJsonArray(chunkData, 3 + chunkData[0], chunkData[1]));
         jsonRect.put("colors", getJsonArray(chunkData, 3 + chunkData[0] + chunkData[1], chunkData[2]));
diff --git a/src/plugins/platforms/android/android.pro b/src/plugins/platforms/android/android.pro
index ffbad08c10..f55bc40a55 100644
--- a/src/plugins/platforms/android/android.pro
+++ b/src/plugins/platforms/android/android.pro
@@ -50,7 +50,6 @@ SOURCES += $$PWD/androidplatformplugin.cpp \
            $$PWD/qandroidplatformbackingstore.cpp \
            $$PWD/qandroidplatformopenglcontext.cpp \
            $$PWD/qandroidplatformforeignwindow.cpp \
-           $$PWD/extract.cpp \
            $$PWD/qandroideventdispatcher.cpp
 
 HEADERS += $$PWD/qandroidplatformintegration.h \
@@ -80,6 +79,9 @@ HEADERS += $$PWD/qandroidplatformintegration.h \
            $$PWD/qandroidplatformforeignwindow.h \
            $$PWD/qandroideventdispatcher.h
 
+android-style-assets: SOURCES += $$PWD/extract.cpp
+else: SOURCES += $$PWD/extract-dummy.cpp
+
 #Non-standard install directory, QTBUG-29859
 DESTDIR = $$DESTDIR/android
 target.path = $${target.path}/android
diff --git a/src/plugins/platforms/android/extract-dummy.cpp b/src/plugins/platforms/android/extract-dummy.cpp
new file mode 100644
index 0000000000..86ac554531
--- /dev/null
+++ b/src/plugins/platforms/android/extract-dummy.cpp
@@ -0,0 +1,55 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <jni.h>
+#include <extract.h>
+
+extern "C" JNIEXPORT jintArray JNICALL Java_org_qtproject_qt5_android_ExtractStyle_extractNativeChunkInfo(JNIEnv *, jobject, Res_png_9patch*)
+{
+    return 0;
+}
+
+extern "C" JNIEXPORT jintArray JNICALL Java_org_qtproject_qt5_android_ExtractStyle_extractChunkInfo(JNIEnv *, jobject, jbyteArray)
+{
+        return 0;
+}
+
+extern "C" JNIEXPORT jintArray JNICALL Java_org_qtproject_qt5_android_ExtractStyle_extractNativeChunkInfo20(JNIEnv *, jobject, long)
+{
+    return 0;
+}
+
+extern "C" JNIEXPORT jintArray JNICALL Java_org_qtproject_qt5_android_ExtractStyle_extractChunkInfo20(JNIEnv *, jobject, jbyteArray)
+{
+    return 0;
+}
diff --git a/src/plugins/platforms/android/extract.cpp b/src/plugins/platforms/android/extract.cpp
index b778264573..15a48d2601 100644
--- a/src/plugins/platforms/android/extract.cpp
+++ b/src/plugins/platforms/android/extract.cpp
@@ -5,27 +5,22 @@
 **
 ** This file is part of the plugins of the Qt Toolkit.
 **
-** $QT_BEGIN_LICENSE:LGPL21$
+** $QT_BEGIN_LICENSE:LGPL3$
 ** 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
+** 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 or version 3 as published by the Free
-** Software Foundation and appearing in the file LICENSE.LGPLv21 and
-** LICENSE.LGPLv3 included in the packaging of this file. Please review the
-** following information to ensure the GNU Lesser General Public License
-** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
-** 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.
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
 **
 ** $QT_END_LICENSE$
 **
diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index be692f98c2..99ecc7b2de 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -1331,6 +1331,12 @@ void Configure::parseCmdLine()
             dictionary[ "ANDROID_NDK_TOOLCHAIN_VERSION" ] = configCmdLine.at(i);
         }
 
+        else if (configCmdLine.at(i) == "-no-android-style-assets") {
+            dictionary[ "ANDROID_STYLE_ASSETS" ] = "no";
+        } else if (configCmdLine.at(i) == "-android-style-assets") {
+            dictionary[ "ANDROID_STYLE_ASSETS" ] = "yes";
+        }
+
         else {
             dictionary[ "DONE" ] = "error";
             cout << "Unknown option " << configCmdLine.at(i) << endl;
@@ -1693,6 +1699,7 @@ void Configure::applySpecSpecifics()
         dictionary[ "REDUCE_RELOCATIONS" ]  = "yes";
         dictionary[ "QT_GETIFADDRS" ]       = "no";
         dictionary[ "QT_XKBCOMMON" ]        = "no";
+        dictionary["ANDROID_STYLE_ASSETS"]  = "yes";
     }
 }
 
@@ -3355,6 +3362,9 @@ void Configure::generateQConfigPri()
         if (dictionary["DIRECTWRITE"] == "yes")
             configStream << " directwrite";
 
+        if (dictionary["ANDROID_STYLE_ASSETS"] == "yes")
+            configStream << " android-style-assets";
+
         // ### For compatibility only, should be removed later.
         configStream << " qpa";
 
@@ -4219,11 +4229,17 @@ bool Configure::showLicense(QString orgLicenseFile)
         return true;
     }
 
+    bool showLgpl2 = true;
     QString licenseFile = orgLicenseFile;
     QString theLicense;
     if (dictionary["EDITION"] == "OpenSource" || dictionary["EDITION"] == "Snapshot") {
-        theLicense = "GNU Lesser General Public License (LGPL) version 2.1"
-                     "\nor the GNU Lesser General Public License (LGPL) version 3";
+        if (platform() != ANDROID || dictionary["ANDROID_STYLE_ASSETS"] == "no") {
+            theLicense = "GNU Lesser General Public License (LGPL) version 2.1"
+                         "\nor the GNU Lesser General Public License (LGPL) version 3";
+        } else {
+            theLicense = "GNU Lesser General Public License (LGPL) version 3";
+            showLgpl2 = false;
+        }
     } else {
         // the first line of the license file tells us which license it is
         QFile file(licenseFile);
@@ -4241,7 +4257,8 @@ bool Configure::showLicense(QString orgLicenseFile)
              << endl;
         if (dictionary["EDITION"] == "OpenSource" || dictionary["EDITION"] == "Snapshot") {
             cout << "Type '3' to view the Lesser GNU General Public License version 3 (LGPLv3)." << endl;
-            cout << "Type 'L' to view the Lesser GNU General Public License version 2.1 (LGPLv2.1)." << endl;
+            if (showLgpl2)
+                cout << "Type 'L' to view the Lesser GNU General Public License version 2.1 (LGPLv2.1)." << endl;
         } else {
             cout << "Type '?' to view the " << theLicense << "." << endl;
         }