Qt5关于触摸屏的问题

我添加了函数后点击触摸屏，无论是单点还是多点都无法接收到事件，设备支持触摸屏并关联了tslib，tslib的test中可以进行多点触摸，但界面我接收不到触摸事件，函数如下图添加，这是怎么一回事？

这篇文章：Qt 4.8.6交叉编译环境配置不含tslib触摸屏库也许能够解决你的问题，你可以看下
除此之外, 这篇博客: 交叉编译Qt和tslib中的 Qt5 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:

因为Qt5.9.8支持C++11，所以编译器版本需要高于4.8以上，Xilinx Petalinux2015.2.1的GCC版本为4.9，支持，这里可以看到Qt对arm和arm64的支持，但是已经不支持powpc平台，所以T2080需要自己写mkspecs了，QorIQ-SDK-V2.0-20160527-yocto工具链的gcc版本4.9，理论上支持Qt5.9.8，arm的qmake.conf针对工具链修改，aarch64的默认的就是对的，

zc@ubuntu:~/fdk_develop/package/qt-everywhere-opensource-src-5.9.8$ ls -l qtbase/mkspecs/
total 252
...
drwxrwxr-x  2 zc zc 4096 Apr  9 04:52 linux-aarch64-gnu-g++
drwxrwxr-x  2 zc zc 4096 Apr  9 04:52 linux-arm-gnueabi-g++
...
zc@ubuntu:~/fdk_develop/package/qt-everywhere-opensource-src-5.9.8$ ls -l qtbase/mkspecs/linux-arm-gnueabi-g++/
total 8
-rw-rw-r-- 1 zc zc  766 Apr  9 04:52 qmake.conf
-rw-rw-r-- 1 zc zc 1998 Apr  9 04:52 qplatformdefs.h
zc@ubuntu:~/fdk_develop/package/qt-everywhere-opensource-src-5.9.8$ ls -l qtbase/mkspecs/linux-aarch64-gnu-g++/
total 8
-rw-rw-r-- 1 zc zc  766 Apr  9 04:52 qmake.conf
-rw-rw-r-- 1 zc zc 1998 Apr  9 04:52 qplatformdefs.h

编译，关于rpath，参考-L、-rpath和-rpath-link的区别，-mtdev和-xinput2选项，在help中可以找到这两个选项。mtdev包含了应用程序对多点触摸协议的支持，xinput2实现了Linux的输入子系统对多点触摸的支持。

make clean
./configure -prefix $cur_path/zynq-$PETALINUX_VER -opensource -release -pch -confirm-license -xplatform linux-arm-gnueabi-g++ -shared -iconv -qt-libpng -qt-libjpeg -no-opengl -no-cups -no-glib -no-dbus -no-rpath -no-sse2 -no-sse3 -no-ssse3 -no-sse4.1 -no-sse4.2 -no-avx -no-openssl
make -j4
make install

若要添加对tslib的支持?

-tslib \
-I tslib_install/include \
-L tslib_install/lib

可能会出现安装失败的情况，这不是错误，直接再编译目录下重新执行命令，可能是编译arm平台的qt有残留，所以编译失败，

$ cd qtmultimedia/
$ make clean && make -j8 && make install
$ cd qtlocation/
$ make clean && make -j8 && make install
$ make install

petalinux2018.2的gcc版本7.2.1，这个版本编译不过，大家还是不要挣扎了，用petalinux2018.3的gcc版本7.3.1

In file included from items/qquickitem_p.h:64:0,
                 from items/qquickwindow.cpp:45:
items/qquickclipnode_p.h:57:30: error: comdat-local function called by void QQuickWindowIncubationController::incubate() outside its comdat
 class Q_QUICK_PRIVATE_EXPORT QQuickDefaultClipNode : public QSGClipNode
                              ^~~~~~~~~~~~~~~~~~~~~
_ZN32QQuickWindowIncubationController28incubatingObjectCountChangedEi.part.85/24483 (virtual void QQuickWindowIncubationController::incubatingObjectCountChanged(int)) @0x1007aba7b0
  Type: function definition analyzed
  Visibility: comdat_group:_ZN32QQuickWindowIncubationController28incubatingObjectCountChangedEi artificial
  Same comdat group as: _ZN32QQuickWindowIncubationController28incubatingObjectCountChangedEi/16405
  References: 
  Referring: 
  Availability: local
  First run: 1
  Function flags: body local icf_merged split_part
  Called by: _ZN32QQuickWindowIncubationController8incubateEv.part.86/24484 (1.00 per call) _ZN32QQuickWindowIncubationController28incubatingObjectCountChangedEi/16405 (0.24 per call) 
  Calls: _ZN7QObject10startTimerEiN2Qt9TimerTypeE/23783 (0.37 per call) 
items/qquickclipnode_p.h:57:30: internal compiler error: verify_cgraph_node failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.linaro.org> for instructions.
Makefile:67514: recipe for target '.obj/qquickwindow.o' failed
make[3]: *** [.obj/qquickwindow.o] Error 1
make[3]: Leaving directory '/home/qe/program/qt-everywhere-opensource-src-5.9.6/qtdeclarative/src/quick'
Makefile:118: recipe for target 'sub-quick-install_subtargets-ordered' failed
make[2]: *** [sub-quick-install_subtargets-ordered] Error 2
make[2]: Leaving directory '/home/qe/program/qt-everywhere-opensource-src-5.9.6/qtdeclarative/src'
Makefile:59: recipe for target 'sub-src-install_subtargets' failed
make[1]: *** [sub-src-install_subtargets] Error 2
make[1]: Leaving directory '/home/qe/program/qt-everywhere-opensource-src-5.9.6/qtdeclarative'
Makefile:346: recipe for target 'module-qtdeclarative-install_subtargets' failed
make: *** [module-qtdeclarative-install_subtargets] Error 2

海思平台的fb使用需要先初始化mpp框架，首先在load3531.sh中需要配置显存，

insmod hifb.ko video="hifb:vram0_size:20000,vram1_size:7200,vram2_size:3240,vram3_size:3240,\
                vram4_size:7200,vram5_size:128,vram6_size:128" softcursor="off" u32VcmpBufNum=2\
                apszLayerMmzNames="mmzname0","mmzname1",,"graphics",,"mmzname0"

参考sample_hifb.c文件，打开HDMI接口，设置屏幕分辨率、屏幕起始坐标。程序运行后会自动结束，添加如下代码使程序在后台一直运行，然后在后台运行sample_hifb程序，再运行Qt 程序。

if (pstInfo->ctrlkey == 0)
{
	while(1)
		sleep(5);
}

hifb叠加可以将qt的GUI与海思的MPI分离，在视频层上叠加上图形层，需要修改linuxfb，再设置QT界面透明显示，
(1) 修改qt-everywhere-opensource-src-5.5.1/qtbase/src/plugins/platforms/linuxfb/qlinuxfbscreen.cpp

    for (int i = 0; i < rects.size(); i++)
    {
    // -
        //mBlitter->drawImage(rects[i], *mScreenImage, rects[i]);
    // +
    mBlitter->setCompositionMode(QPainter::CompositionMode_Source);
    mBlitter->drawImage(rects[i], *mScreenImage, rects[i]);
    mBlitter->setCompositionMode(QPainter::CompositionMode_SourceOver);
    }

(2) 修改qtbase\src\platformsupport\fbconvenience\qfbscreen.cpp

// -
//mCompositePainter->fillRect(rect, Qt::black);
//+
mCompositePainter->setCompositionMode(QPainter::CompositionMode_Source);
mCompositePainter->fillRect(rect, Qt::transparent);
mCompositePainter->setCompositionMode(QPainter::CompositionMode_SourceOver);

(3) 修改qt程序

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowFlags(Qt::CustomizeWindowHint);
}

海思平台可能会出现安装失败的情况，可能是编译其他平台有残留，

$ cd qtimageformats/src/plugins/imageformats/tiff/
$ make clean && make -j8 && make install
$ cd qtimageformats/src/plugins/imageformats/webp/
$ make clean && make -j8 && make install
$ cd qtmultimedia/
$ make clean && make -j8 && make install
$ cd qtlocation/
$ make clean && make -j8 && make install
$ make install

setAttribute(Qt::WA_AcceptTouchEvents,true);也已添加
看了下发现接收到了鼠标移动的事件，为什么会接收不到触摸屏事件，触摸屏事件应该是先被接收的吧