qt5.0 release版终于在2012/12/19出来了

看了下源码，模块化做得很不错，很多东西都从原来的qtbase里抽出来，变成单独模块，依赖关系变得很明确

然后就抽了点时间(到年底了，事情也蛮多的)做了下移植工作

qt5.0可能刚出来，很多移植的东西没加进去，所以如果要移植到自己的开发板上，那就要做点移植的工作了

我的编译选项

./configure -v -prefix /qt5.0 -xplatform linux-mips-g++ -confirm-license -release -shared -opensource -nomake demos -nomake examples \

-qt-sql-sqlite \

-no-openvg \

-no-eglfs

其中-xplatform linux-mips-g++就是交叉编译要找的目录

最原始的代码里是没有linux-mips-g++这个目录的

所以要自己添加

创建linux-mips-g++在qtbase/mkspecs下

然后添加文件qmake.conf

MAKEFILE_GENERATOR = UNIX

CONFIG += incremental gdb_dwarf_index

QMAKE_INCREMENTAL_STYLE = sublib

include(../common/linux.conf)

include(../common/gcc-base-unix.conf)

include(../common/g++-unix.conf)

# modifications to g++.conf

QMAKE_CC = mipsel-linux-gcc

QMAKE_CXX = mipsel-linux-g++

QMAKE_CFLAGS += -mips32

QMAKE_CXXFLAGS += -mips32

QMAKE_LINK = mipsel-linux-g++

QMAKE_LINK_SHLIB = mipsel-linux-g++

# modifications to linux.conf

QMAKE_AR = mipsel-linux-ar cqs

QMAKE_OBJCOPY = mipsel-linux-objcopy

QMAKE_STRIP = mipsel-linux-strip

load(qt_config)

就可以了

然后执行编译选项，然后make,make install就可以了

之后就是重点，写图形插件，就是将qt生成的图片的buffer copy到板子sdk提供的fb接口上

qt5对比qt4对于插件的改动还是蛮大的，至少目录结构改了

qt4是在plugins/gfxdrivers下

qt5则在plugins/platforms下

那么就进入plugins/platforms下

自己创建个目录，写工程文件和继承对应的插件类，进行扩展(看过很多开源代码，大部分都是这种设计模式，一来你增加功能只需要添加代码就可以，二来这种结构在运行时加载，你可以随时切换，大家设计自己的工程时不妨考虑这种设计模式)

1.创建xxx.json文件(xxx就是你自定义命名)

{

"Keys": [ "xxx"]

}

2.创建main.cpp

#include

#include "qxxxintegration.h"

QT_BEGIN_NAMESPACE

class QxxxIntegrationPlugin : public QPlatformIntegrationPlugin

{

Q_OBJECT

Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.1" FILE "bcm.json")

public:

QPlatformIntegration *create(const QString&, const QStringList&);

};

QPlatformIntegration * QxxxIntegrationPlugin::create(const QString& system, const QStringList& paramList)

{

Q_UNUSED(paramList);

if (system.toLower() == "xxx")

return new QxxxIntegration(paramList);

return 0;

}

QT_END_NAMESPACE

#include "main.moc"

3.qxxxintegration.h(这里和后面都用linuxfb里的例子)

#ifndef QLINUXFBINTEGRATION_H

#define QLINUXFBINTEGRATION_H

#include

QT_BEGIN_NAMESPACE

class QLinuxFbIntegrationPrivate;

class QAbstractEventDispatcher;

class QLinuxFbScreen;

class QLinuxFbIntegration : public QPlatformIntegration

{

public:

QLinuxFbIntegration(const QStringList ¶mList);

~QLinuxFbIntegration();

bool hasCapability(QPlatformIntegration::Capability cap) const;

QPlatformPixmap *createPlatformPixmap(QPlatformPixmap::PixelType type) const;

QPlatformWindow *createPlatformWindow(QWindow *window) const;

QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const;

QAbstractEventDispatcher *guiThreadEventDispatcher() const;

QList screens() const;

QPlatformFontDatabase *fontDatabase() const;

private:

QLinuxFbScreen *m_primaryScreen;

QPlatformFontDatabase *m_fontDb;

QAbstractEventDispatcher *m_eventDispatcher;

};

QT_END_NAMESPACE

#endif // QLINUXFBINTEGRATION_H

4.qxxxintegration.cpp

#include "qlinuxfbintegration.h"

#include "qlinuxfbscreen.h"

#include

#include

#include

#include

#include

#include

#include

QT_BEGIN_NAMESPACE

QLinuxFbIntegration::QLinuxFbIntegration(const QStringList ¶mList)

: m_fontDb(new QGenericUnixFontDatabase()),

m_eventDispatcher(createUnixEventDispatcher())

{

QGuiApplicationPrivate::instance()->setEventDispatcher(m_eventDispatcher);

m_primaryScreen = new QLinuxFbScreen;

if (m_primaryScreen->initialize(paramList))

screenAdded(m_primaryScreen);

}

QLinuxFbIntegration::~QLinuxFbIntegration()

{

delete m_primaryScreen;

}

bool QLinuxFbIntegration::hasCapability(QPlatformIntegration::Capability cap) const

{

switch (cap) {

case ThreadedPixmaps: return true;

default: return QPlatformIntegration::hasCapability(cap);

}

}

QPlatformPixmap *QLinuxFbIntegration::createPlatformPixmap(QPlatformPixmap::PixelType type) const

{

return new QRasterPlatformPixmap(type);

}

QPlatformBackingStore *QLinuxFbIntegration::createPlatformBackingStore(QWindow *window) const

{

return new QFbBackingStore(window);

}

QPlatformWindow *QLinuxFbIntegration::createPlatformWindow(QWindow *window) const

{

return new QFbWindow(window);

}

QAbstractEventDispatcher *QLinuxFbIntegration::guiThreadEventDispatcher() const

{

return m_eventDispatcher;

}

QList QLinuxFbIntegration::screens() const

{

QList list;

list.append(m_primaryScreen);

return list;

}

QPlatformFontDatabase *QLinuxFbIntegration::fontDatabase() const

{

return m_fontDb;

}

QT_END_NAMESPACE

5.qxxxscreen.h(这个我针对linuxfbscreen.h删改过的)

#ifndef QLINUXFBSCREEN_H

#define QLINUXFBSCREEN_H

#include

QT_BEGIN_NAMESPACE

class QPainter;

class QFbCursor;

class QLinuxFbScreen : public QFbScreen

{

Q_OBJECT

public:

QLinuxFbScreen();

~QLinuxFbScreen();

bool initialize(const QStringList &args);

public slots:

QRegion doRedraw();

private:

QImage mFbScreenImage;

int mBytesPerLine;

QPainter *mBlitter;

};

QT_END_NAMESPACE

#endif // QLINUXFBSCREEN_H

6.qxxxscreen.cpp

#include "qlinuxfbscreen.h"

#include

#include

#include // overrides QT_OPEN

#include

#include

#include

#include

#include

#include "bcminterface.h"

QT_BEGIN_NAMESPACE

#define WIDTH_FB 1440

#define HEIGHT_FB 1080

#define BYTESPERLINE (4 * WIDTH_FB)

#define DEPTH_FB (4 * 8)

#define DPI (72)

#define ROUND_PI ((double)25.4)

QLinuxFbScreen::QLinuxFbScreen()

: mBlitter(0)

{

InitBCMInterface(WIDTH_FB, HEIGHT_FB);

}

QLinuxFbScreen::~QLinuxFbScreen()

{

delete mBlitter;

}

static uchar* pBuffer = NULL;

static int nSize = 0;

bool QLinuxFbScreen::initialize(const QStringList &args)

{

#if 1

mDepth = DEPTH_FB;//determineDepth(vinfo);

mBytesPerLine = BYTESPERLINE;//finfo.line_length;

mGeometry = QRect(0, 0, WIDTH_FB, HEIGHT_FB);//determineGeometry(vinfo, userGeometry);

mFormat = QImage::Format_ARGB32;//determineFormat(vinfo, mDepth);

//printf("[GUM], format: %d, %d, \n", mFormat, QImage::Format_ARGB32_Premultiplied, __FILE__, __FUNCTION__, __LINE__);

mPhysicalSize = QSize(qRound(WIDTH_FB * ROUND_PI / DPI), qRound(HEIGHT_FB * ROUND_PI / DPI));//determinePhysicalSize(vinfo, userMmSize, mGeometry.size());

#endif

nSize = (WIDTH_FB * HEIGHT_FB * 4);

pBuffer = (uchar*)GetBcmBuffer(&nSize);

memset(pBuffer, 0, nSize);

QFbScreen::initializeCompositor();

mFbScreenImage = QImage(pBuffer, mGeometry.width(), mGeometry.height(), mBytesPerLine, mFormat);

mCursor = new QFbCursor(this);

return true;

}

QRegion QLinuxFbScreen::doRedraw()

{

QRegion touched = QFbScreen::doRedraw();

if (touched.isEmpty())

{

return touched;

}

if (!mBlitter)

mBlitter = new QPainter(&mFbScreenImage);

QVector rects = touched.rects();

for (int i = 0; i < rects.size(); i++)

mBlitter->drawImage(rects[i], *mScreenImage, rects[i]);

return touched;

}

QT_END_NAMESPACE

主要是继承了QFbScreen，要设一下成员变量的值

其中mDepth、mGeometry、mFormat、mPhysicalSize要设一下

然后初始化QFbScreen::initializeCompositor();

mCursor = new QFbCursor(this);

将你sdk上对应fb的指针传给mFbScreenImage对象，就是pBuffer的值，不同sdk有不同的做法，这里就不详说了

最后doredraw是由qt去调，进行绘画

我这里用了test/manual/qlayout作为测试例子

执行qlayout -platform xxx

结果如下