qt5webengine: new package

This patch is based on works [1] and [2].

With this patch, one can run the Qt5 WebEngine quicknanobrowser sample
with the following options.

	BR2_TOOLCHAIN_BUILDROOT_LIBC="glibc" and
	BR2_TOOLCHAIN_BUILDROOT_CXX (Qt 5 needs a toolchain w/ wchar, NPTL, C++,
	dynamic library; for now it builds only with glibc)
	BR2_PACKAGE_LIBERATION (Qt needs at least one font)
	BR2_PACKAGE_QT5BASE_EXAMPLES (to install quicknanobrowser sample)
	BR2_PACKAGE_QT5BASE_GIF (do display gif)
	BR2_PACKAGE_QT5BASE_JPEG (do display jpeg)
	BR2_PACKAGE_QT5BASE_PNG (do display png)
	BR2_PACKAGE_QT5QUICKCONTROLS (needed by webengine)
	BR2_PACKAGE_QT5QUICKCONTROLS2 (needed by webengine)
	BR2_PACKAGE_QT5WEBENGINE (because it is what we want)

Qt WebEngine requires an Open(E)GL-capable backend. As an example, the
package rpi-userland must be enabled to build for a rpi.

	BR2_PACKAGE_RPI_USERLAND (to enable OpenGL ES backend)

To browse for HTTPS websites, please consider adding the following
options as well for SSL/TLS.

	BR2_PACKAGE_CA_CERT (for certificates)
	BR2_PACKAGE_NTPD (to sync date for certificates)

Since version 5.9, chromium requires udev at runtime (see note 4).

	BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV (input backend)

To run quicknanobrowser

	# cd /usr/lib/qt/examples/webengine/quicknanobrowser/
	# ./quicknanobrowser https://www.buildroot.org/

Note: The chromium.inc has been generated using the following command.

	( echo 'CHROMIUM_LICENSE_FILES = \' &&
	  cd output/build/qt5webengine-5.9.1/ && \
	  find "src/3rdparty/chromium/" -type f -iname "*LICENSE*" -o -iname "*COPYING*" -o -iname "*GPL*" | \
	  sed -e '/\.asm$/d' \
	      -e '/\.h$/d' \
	      -e '/\.c$/d' \
	      -e '/\.cc$/d' \
	      -e '/\.cpp$/d' \
	      -e '/\.pyc\?$/d' \
	      -e '/\.pl$/d' \
	      -e '/\.sha1$/d' \
	      -e '/\.patch$/d' \
	      -e '/licensecheck/d' \
	      -e 's,^,\t,' \
	      -e 's,$, \\,' | \
	  sort && \
	  echo '' ) >package/qt5/qt5webengine/chromium.inc

Note 2: Since 5.9.1, the chromium's copy of opus fails with neon [3].
Qt WebEngine can uses buildroot ffmpeg copy which compiles fine (using
qmake flag WEBENGINE_CONFIG+=use_system_ffmpeg). It implies selecting
the following options.

	BR2_PACKAGE_FFMPEG
	BR2_PACKAGE_OPUS
	BR2_PACKAGE_LIBVPX
	BR2_PACKAGE_WEBP
	BR2_PACKAGE_WEBP_DEMUX

	In file included from ../../3rdparty/chromium/third_party/opus/src/silk/arm/NSQ_neon.c:31:0:
	/home/gportay/src/buildroot/output-rpi3-qt5.9/host/lib/gcc/arm-buildroot-linux-gnueabihf/6.4.0/include/arm_neon.h:8997:1: error: inlining failed in call to always_inline ‘vld1q_s32’: target specific option mismatch
	 vld1q_s32 (const int32_t * __a)
	 ^~~~~~~~~
	../../3rdparty/chromium/third_party/opus/src/silk/arm/NSQ_neon.c:40:15: note: called from here
	     int32x4_t coef0 = vld1q_s32(coef32);
		       ^~~~~
	../../3rdparty/chromium/third_party/opus/src/silk/arm/NSQ_neon.c: At top level:
	cc1: warning: unrecognized command line option ‘-Wno-#pragma-messages’

Note 3: Version 5.6.2 causes a build issue while building chromium. The
build against this version is disabled until the release 5.6.3 is out.

Note 4: Here is trace when udev does not run

	# cd /usr/lib/qt/examples/webengine/quicknanobrowser
	# ./quicknanobrowser
	QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
	Unable to query physical screen size, defaulting to 100 dpi.
	To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
	[0101/000248.161973:WARNING:resource_bundle_qt.cpp(114)] locale_file_path.empty() for locale
	[0101/000248.384693:WARNING:resource_bundle_qt.cpp(114)] locale_file_path.empty() for locale
	[202:223:0101/000248.484954:FATAL:udev_loader.cc(38)] Check failed: false.
	#0 0x0000742b93de <unknown>
	#1 0x0000742c3c38 <unknown>
	#2 0x000073e1e1aa <unknown>
	#3 0x000073e1d96e <unknown>
	#4 0x000073e1defa <unknown>
	#5 0x000074af6364 <unknown>
	#6 0x000074302878 <unknown>
	#7 0x0000742c8fee <unknown>
	#8 0x0000742c9f44 <unknown>
	#9 0x0000742ca21e <unknown>
	#10 0x0000742cac4c <unknown>
	#11 0x0000742c87b2 <unknown>
	#12 0x0000742da4f6 <unknown>
	#13 0x000073ed9d38 <unknown>
	#14 0x000073eda03c <unknown>
	#15 0x0000742e9aec <unknown>
	#16 0x0000742e71dc <unknown>

	Aborted

Note 5: On rpi and depending on what is insinde the .config, more GPU
memory should be allocated to run properly qt samples.

	#0 0x0000742c63de <unknown>
	#1 0x0000742d0c38 <unknown>
	#2 0x0000749d7bde <unknown>
	#3 0x0000749e3c70 <unknown>
	#4 0x00007530227c <unknown>
	#5 0x000075302480 <unknown>
	#6 0x0000752fb1e4 <unknown>
	#7 0x00007430f878 <unknown>
	#8 0x0000742d5fee <unknown>
	#9 0x0000742d6f44 <unknown>
	#10 0x0000742d721e <unknown>
	#11 0x0000742d7ad6 <unknown>
	#12 0x0000742d57b2 <unknown>
	#13 0x0000742e74f6 <unknown>
	#14 0x0000742f6a74 <unknown>
	#15 0x0000742f41dc <unknown>

	Received signal 6
	#0 0x0000742c63de <unknown>
	#1 0x0000742c66a0 <unknown>
	#2 0x0000725b5d10 <unknown>
	[end of stack trace]
	qml: Render process exited with code 256 (abnormal exit)

	# mount /dev/mmcblk0p1 /mnt
	# sed '/^gpu_mem_/s,=.*,=200,' -i /mnt/config.txt
	# umount /mnt

Note 6: The first patch fixes a build issue when samples are compiled
without the support of printing [4]. This patch is already merged in
branch 5.9 [5] and concerns only 5.9.1.

	085c2c52 Always compile QWebEnginePage::print

It fixes the error below.

	.obj/browsermainwindow.o: In function `BrowserMainWindow::printRequested(QWebEnginePage*)': browsermainwindow.cpp:(.text+0x2cc0): undefined reference to `QWebEnginePage::print(QPrinter*, QWebEngineCallback<bool> const&)'

The second patch loads both libEGL and libGLESv2 symbols implicitly
instead of loading them with explicitly using hard-coded locations. It
fixes a bug when providers of lib*GL does not create libraries named
libEGL.so.1 and libGLESv2.s2 [6]. This patch is already merged in branch
5.9 [7].

	d4c621f6 Load libEGL and libGLES2 symbols implicitly

It fixes the error below.

	[327:347:1221/085837:ERROR:surface_factory_qt.cpp(68)] Failed to load /usr/lib/libGLESv2.so.2: /usr/lib/libGLESv2.so.2: cannot open shared object file: No such file or directory

[1]: http://lists.busybox.net/pipermail/buildroot/2015-July/132010.html
[2]: https://patchwork.ozlabs.org/patch/640633/
[3]: https://patchwork.ozlabs.org/patch/791332/
[4]: https://bugreports.qt.io/browse/QTBUG-61510
[5]: https://codereview.qt-project.org/#/c/198041/
[6]: https://bugreports.qt.io/browse/QTBUG-57761
[7]: https://codereview.qt-project.org/#/c/199554/

Cc: Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
Cc: Julien Corjon <corjon.j@ecagroup.com>
Signed-off-by: Gaël PORTAY <gael.portay@savoirfairelinux.com>
[Arnout:
 - move more dependencies to _ARCH_DEPENDS;
 - mention all toolchain dependencies in the comments]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

1 files changed, 246 insertions, 0 deletions

diff --git a/package/qt5/qt5webengine/5.9.1/0001-Always-compile-QWebEnginePage-print.patch b/package/qt5/qt5webengine/5.9.1/0001-Always-compile-QWebEnginePage-print.patch
new file mode 100644
index 0000000000..5e863231ac
--- /dev/null
+++ b/package/qt5/qt5webengine/5.9.1/0001-Always-compile-QWebEnginePage-print.patch
@@ -0,0 +1,246 @@
+From 085c2c529473bbe9dd7c8c5698a45053520cc423 Mon Sep 17 00:00:00 2001
+From: =?utf-8?q?J=C3=BCri=20Valdmann?= <juri.valdmann@qt.io>
+Date: Tue, 20 Jun 2017 15:36:43 +0200
+Subject: [PATCH 1/1] Always compile QWebEnginePage::print
+
+- Remove two out of five layers of ifdefs around and inside this method.
+- Now always compiled but will yield an error if printing is disabled.
+- Remove printing-related ifdefs from demobrowser.
+
+Task-number: QTBUG-61510
+Change-Id: I79781189d3d3fb62db0a2216b2b989e3fa1d1f86
+Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
+Reviewed-by: Rolf Eike Beer <eb@emlix.com>
+Upstream-Status: Merged
+Signed-off-by: Gaël PORTAY <gael.portay@savoirfairelinux.com>
+---
+ examples/webenginewidgets/demobrowser/browsermainwindow.cpp | 12 ------------
+ examples/webenginewidgets/demobrowser/browsermainwindow.h   |  6 ------
+ examples/webenginewidgets/demobrowser/printtopdfdialog.cpp  |  7 -------
+ src/webenginewidgets/api/qwebenginepage.cpp                 | 10 ++--------
+ src/webenginewidgets/api/qwebenginepage.h                   |  8 --------
+ 5 files changed, 2 insertions(+), 41 deletions(-)
+
+diff --git a/examples/webenginewidgets/demobrowser/browsermainwindow.cpp b/examples/webenginewidgets/demobrowser/browsermainwindow.cpp
+index 327d7a9d..14d49f7f 100644
+--- a/examples/webenginewidgets/demobrowser/browsermainwindow.cpp
++++ b/examples/webenginewidgets/demobrowser/browsermainwindow.cpp
+@@ -109,9 +109,7 @@ BrowserMainWindow::BrowserMainWindow(QWidget *parent, Qt::WindowFlags flags)
+     , m_historyForward(0)
+     , m_stop(0)
+     , m_reload(0)
+-#ifndef QT_NO_PRINTER
+     , m_currentPrinter(nullptr)
+-#endif
+ {
+     setToolButtonStyle(Qt::ToolButtonFollowStyle);
+     setAttribute(Qt::WA_DeleteOnClose, true);
+@@ -312,9 +310,7 @@ void BrowserMainWindow::setupMenu()
+ #if defined(QWEBENGINEPAGE_PRINT)
+     fileMenu->addAction(tr("P&rint Preview..."), this, SLOT(slotFilePrintPreview()));
+ #endif
+-#ifndef QT_NO_PRINTER
+     fileMenu->addAction(tr("&Print..."), this, SLOT(slotFilePrint()), QKeySequence::Print);
+-#endif
+     fileMenu->addAction(tr("&Print to PDF..."), this, SLOT(slotFilePrintToPDF()));
+     fileMenu->addSeparator();
+ 
+@@ -702,23 +698,19 @@ void BrowserMainWindow::slotFileOpen()
+ 
+ void BrowserMainWindow::slotFilePrintPreview()
+ {
+-#ifndef QT_NO_PRINTPREVIEWDIALOG
+     if (!currentTab())
+         return;
+     QPrintPreviewDialog *dialog = new QPrintPreviewDialog(this);
+     connect(dialog, SIGNAL(paintRequested(QPrinter*)),
+             currentTab(), SLOT(print(QPrinter*)));
+     dialog->exec();
+-#endif
+ }
+ 
+ void BrowserMainWindow::slotFilePrint()
+ {
+-#ifndef QT_NO_PRINTER
+     if (!currentTab())
+         return;
+     printRequested(currentTab()->page());
+-#endif
+ }
+ 
+ void BrowserMainWindow::slotHandlePdfPrinted(const QByteArray& result)
+@@ -751,7 +743,6 @@ void BrowserMainWindow::slotFilePrintToPDF()
+     currentTab()->page()->printToPdf(invoke(this, &BrowserMainWindow::slotHandlePdfPrinted), dialog->pageLayout());
+ }
+ 
+-#ifndef QT_NO_PRINTER
+ void BrowserMainWindow::slotHandlePagePrinted(bool result)
+ {
+     Q_UNUSED(result);
+@@ -763,7 +754,6 @@ void BrowserMainWindow::slotHandlePagePrinted(bool result)
+ 
+ void BrowserMainWindow::printRequested(QWebEnginePage *page)
+ {
+-#ifndef QT_NO_PRINTDIALOG
+     if (m_currentPrinter)
+         return;
+     m_currentPrinter = new QPrinter();
+@@ -774,9 +764,7 @@ void BrowserMainWindow::printRequested(QWebEnginePage *page)
+         return;
+     }
+     page->print(m_currentPrinter, invoke(this, &BrowserMainWindow::slotHandlePagePrinted));
+-#endif
+ }
+-#endif
+ 
+ void BrowserMainWindow::slotPrivateBrowsing()
+ {
+diff --git a/examples/webenginewidgets/demobrowser/browsermainwindow.h b/examples/webenginewidgets/demobrowser/browsermainwindow.h
+index 91e1c1d2..5bbbb292 100644
+--- a/examples/webenginewidgets/demobrowser/browsermainwindow.h
++++ b/examples/webenginewidgets/demobrowser/browsermainwindow.h
+@@ -56,9 +56,7 @@
+ #include <QtCore/QUrl>
+ 
+ QT_BEGIN_NAMESPACE
+-#ifndef QT_NO_PRINTER
+ class QPrinter;
+-#endif
+ class QWebEnginePage;
+ QT_END_NAMESPACE
+ 
+@@ -142,10 +140,8 @@ private slots:
+     void slotSwapFocus();
+     void slotHandlePdfPrinted(const QByteArray&);
+ 
+-#ifndef QT_NO_PRINTER
+     void slotHandlePagePrinted(bool result);
+     void printRequested(QWebEnginePage *page);
+-#endif
+     void geometryChangeRequested(const QRect &geometry);
+     void updateToolbarActionText(bool visible);
+     void updateBookmarksToolbarActionText(bool visible);
+@@ -180,9 +176,7 @@ private:
+     QAction *m_restoreLastSession;
+     QAction *m_addBookmark;
+ 
+-#ifndef QT_NO_PRINTER
+     QPrinter *m_currentPrinter;
+-#endif
+ 
+     QIcon m_reloadIcon;
+     QIcon m_stopIcon;
+diff --git a/examples/webenginewidgets/demobrowser/printtopdfdialog.cpp b/examples/webenginewidgets/demobrowser/printtopdfdialog.cpp
+index 0f3b1765..50a8bb91 100644
+--- a/examples/webenginewidgets/demobrowser/printtopdfdialog.cpp
++++ b/examples/webenginewidgets/demobrowser/printtopdfdialog.cpp
+@@ -52,10 +52,8 @@
+ #include "ui_printtopdfdialog.h"
+ 
+ #include <QtCore/QDir>
+-#ifndef QT_NO_PRINTER
+ #include <QtPrintSupport/QPageSetupDialog>
+ #include <QtPrintSupport/QPrinter>
+-#endif // QT_NO_PRINTER
+ #include <QtWidgets/QFileDialog>
+ 
+ PrintToPdfDialog::PrintToPdfDialog(const QString &filePath, QWidget *parent) :
+@@ -66,11 +64,8 @@ PrintToPdfDialog::PrintToPdfDialog(const QString &filePath, QWidget *parent) :
+     ui->setupUi(this);
+     setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+     connect(ui->chooseFilePathButton, &QToolButton::clicked, this, &PrintToPdfDialog::onChooseFilePathButtonClicked);
+-#ifndef QT_NO_PRINTER
+     connect(ui->choosePageLayoutButton, &QToolButton::clicked, this, &PrintToPdfDialog::onChoosePageLayoutButtonClicked);
+-#else
+     ui->choosePageLayoutButton->hide();
+-#endif // QT_NO_PRINTER
+     updatePageLayoutLabel();
+     setFilePath(filePath);
+ }
+@@ -82,7 +77,6 @@ PrintToPdfDialog::~PrintToPdfDialog()
+ 
+ void PrintToPdfDialog::onChoosePageLayoutButtonClicked()
+ {
+-#ifndef QT_NO_PRINTER
+     QPrinter printer;
+     printer.setPageLayout(currentPageLayout);
+ 
+@@ -92,7 +86,6 @@ void PrintToPdfDialog::onChoosePageLayoutButtonClicked()
+     currentPageLayout.setPageSize(printer.pageLayout().pageSize());
+     currentPageLayout.setOrientation(printer.pageLayout().orientation());
+     updatePageLayoutLabel();
+-#endif // QT_NO_PRINTER
+ }
+ 
+ void PrintToPdfDialog::onChooseFilePathButtonClicked()
+diff --git a/src/webenginewidgets/api/qwebenginepage.cpp b/src/webenginewidgets/api/qwebenginepage.cpp
+index 2cdb0116..6042b9fd 100644
+--- a/src/webenginewidgets/api/qwebenginepage.cpp
++++ b/src/webenginewidgets/api/qwebenginepage.cpp
+@@ -80,11 +80,9 @@
+ #include <QMenu>
+ #include <QMessageBox>
+ #include <QMimeData>
+-#if defined(QT_PRINTSUPPORT_LIB)
+-#ifndef QT_NO_PRINTER
++#ifdef ENABLE_PRINTING
+ #include <QPrinter>
+-#endif //QT_NO_PRINTER
+-#endif //QT_PRINTSUPPORT_LIB
++#endif
+ #include <QStandardPaths>
+ #include <QStyle>
+ #include <QTimer>
+@@ -2051,8 +2049,6 @@ void QWebEnginePage::printToPdf(const QWebEngineCallback<const QByteArray&> &res
+ #endif // if defined(ENABLE_PDF)
+ }
+ 
+-#if defined(QT_PRINTSUPPORT_LIB)
+-#ifndef QT_NO_PRINTER
+ /*!
+     \fn void QWebEnginePage::print(QPrinter *printer, FunctorOrLambda resultCallback)
+     Renders the current content of the page into a temporary PDF document, then prints it using \a printer.
+@@ -2089,8 +2085,6 @@ void QWebEnginePage::print(QPrinter *printer, const QWebEngineCallback<bool> &re
+     d->m_callbacks.invokeDirectly(resultCallback, false);
+ #endif // if defined(ENABLE_PDF)
+ }
+-#endif // if defined(QT_NO_PRINTER)
+-#endif // if defined(QT_PRINTSUPPORT_LIB)
+ 
+ /*!
+     \since 5.7
+diff --git a/src/webenginewidgets/api/qwebenginepage.h b/src/webenginewidgets/api/qwebenginepage.h
+index c7d5a19e..5619639c 100644
+--- a/src/webenginewidgets/api/qwebenginepage.h
++++ b/src/webenginewidgets/api/qwebenginepage.h
+@@ -55,11 +55,7 @@
+ 
+ QT_BEGIN_NAMESPACE
+ class QMenu;
+-#if defined(QT_PRINTSUPPORT_LIB)
+-#ifndef QT_NO_PRINTER
+ class QPrinter;
+-#endif // QT_NO_PRINTER
+-#endif // QT_PRINTSUPPORT_LIB
+ 
+ class QWebChannel;
+ class QWebEngineContextMenuData;
+@@ -294,15 +290,11 @@ public:
+     void printToPdf(const QWebEngineCallback<const QByteArray&> &resultCallback, const QPageLayout &layout = QPageLayout(QPageSize(QPageSize::A4), QPageLayout::Portrait, QMarginsF()));
+ #endif
+ 
+-#if defined(QT_PRINTSUPPORT_LIB)
+-#ifndef QT_NO_PRINTER
+ #ifdef Q_QDOC
+     void print(QPrinter *printer, FunctorOrLambda resultCallback);
+ #else
+     void print(QPrinter *printer, const QWebEngineCallback<bool> &resultCallback);
+ #endif // QDOC
+-#endif // QT_NO_PRINTER
+-#endif // QT_PRINTSUPPORT_LIB
+ 
+     const QWebEngineContextMenuData &contextMenuData() const;
+ 
+-- 
+2.13.2
+