QImage 图片分割、保存

QImage()
QImage(const QSize &size, QImage::Format format)
QImage(int width, int height, QImage::Format format)
QImage(uchar *data, int width, int height, QImage::Format format, QImageCleanupFunction cleanupFunction = nullptr, void *cleanupInfo = nullptr)
QImage(const uchar *data, int width, int height, QImage::Format format, QImageCleanupFunction cleanupFunction = nullptr, void *cleanupInfo = nullptr)
QImage(uchar *data, int width, int height, int bytesPerLine, QImage::Format format, QImageCleanupFunction cleanupFunction = nullptr, void *cleanupInfo = nullptr)
QImage(const uchar *data, int width, int height, int bytesPerLine, QImage::Format format, QImageCleanupFunction cleanupFunction = nullptr, void *cleanupInfo = nullptr)
QImage(const char *const [] xpm)
QImage(const QString &fileName, const char *format = nullptr)
QImage(const QImage &image)
QImage(QImage &&other)

QImage::Format format() const
QImage convertToFormat(QImage::Format format, Qt::ImageConversionFlags flags = Qt::AutoColor) const &
QImage convertToFormat(QImage::Format format, Qt::ImageConversionFlags flags = Qt::AutoColor) &&
QImage convertToFormat(QImage::Format format, const QVector<QRgb> &colorTable, Qt::ImageConversionFlags flags = Qt::AutoColor) const

bool load(const QString &fileName, const char *format = nullptr)
bool load(QIODevice *device, const char *format)
bool loadFromData(const uchar *data, int len, const char *format = nullptr)
bool loadFromData(const QByteArray &data, const char *format = nullptr)

uchar *bits()
const uchar *bits() const
int bytesPerLine() const
const uchar *constBits() const
const uchar *constScanLine(int i) const

QRgb color(int i) const
QVector<QRgb> colorTable() const
QRgb pixel(const QPoint &position) const
QRgb pixel(int x, int y) const

1.载入图片
2.切割图片
->2.1 设置切割属性：将图片切割为 n*m 个图片
->2.2 计算每个图片的rect，保存为rect列表
->2.3 利用copy(Rect)函数将指定区域图片copy出来，存储到切割列表中
3.显示图片
-> 按照rect列表显示切割后的图片
4.保存图片
-> 将切割后的图片存储到指定位置

image.cpp
image.h
image.ui

class image : public QWidget
{
    Q_OBJECT

public:
    explicit image(QWidget *parent = nullptr);
    ~image();
    //图片载入
    void imageLoad(const QString path);
    void imageLoad(const QString path, int &_width, int &_height);

    uchar* imageData();
	//图像切割
    void iamgeItems(int x, int y, QList<QImage> &imageList);
    void iamgeItems(int x, int y, QList<uchar*> &list);//uchar* 方便像素级的图像算法或者其他图像操作
    void iamgeItems(int x, int y, QVector<uchar*> & vector);
	//图像保存
    void imageSave();
    void imageSave(int index);
    void imageSave(int start,int end);
	//图像显示
    void imageShow();
    void imageShow(QList<QImage> &listImage);
    void imageShow(QList<uchar*> &listItems);
    void imageShow(QVector<uchar*> &VectorItems);
    static image* instance();
private:
    Ui::image *ui;
    QImage r_image;
    uchar * r_image_data;
    QList<QRect> _imageRects;
    QList<QImage> _imageList;
    QList<uchar*> _listItems;
    QVector<uchar*> _vectorItems;
};

//利用load方法载入图像
void image::imageLoad(const QString path)
{
    r_image.load(path);
}

void image::imageLoad(const QString path, int &_width, int &_height)
{
    r_image.load(path);
    _width = r_image.width();
    _height = r_image.height();
}

void image::iamgeItems(int x, int y, QList<QImage> &imageList)
{
    int r_width = r_image.width();
    int r_height =  r_image.height();
    int cellWidth = r_width / x;
    int cellHeight = r_height / y;
    qDebug() << r_width << " " <<  r_height << " " << cellWidth << " " << cellHeight;
    for(int i = 0 ;i < x; i++ )
    {
        for (int j = 0; j < y; j++) {
            QRect rect(i * cellWidth,j * cellHeight, cellWidth,cellHeight);
            qDebug() << rect.x() << " " <<  rect.y() << " " << rect.width() << " " << rect.height();
            _imageRects.push_back(rect);
            imageList.push_back(r_image.copy(rect));
        }
    }
    _imageList = imageList;
}

void image::imageSave()
{
    int i = 0;
    for(auto it : _imageList)
    {
        QString imageName = QString("image/%1.jpg").arg(i);
        it.save(imageName);
        i++;
    }
    qDebug() << "iamge save ok";
}

void image::imageSave(int index)
{
    _imageList.at(index).save(QString("image/%1.jpg").arg(index));
}

void image::imageShow()
{
    for(int i = 0 ;i < _imageList.size() ; i++)
    {
        QLabel * label = new QLabel(this);
        label->setGeometry(_imageRects.at(i));
        QPixmap pixmap(QPixmap::fromImage(_imageList.at(i)));
        label->setPixmap(pixmap);
        label->show();
    }
}

mainwindow.cpp
mainwindow.h
mainwindow.ui

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    void menuInit();
private:
    Ui::MainWindow *ui;
    void sltImportImage();
    void sltSpliteImage();
    void sltSaveImage();
    void sltcalcImage();
};

void MainWindow::menuInit()
{
    QAction* importImage = ui->menuBar->addAction(QString("导入图片"));
    QAction* spliteImage = ui->menuBar->addAction(QString("切割图片"));
    QAction* saveImage = ui->menuBar->addAction(QString("保存图片"));
    QAction* calcImage = ui->menuBar->addAction(QString("算法"));
    connect(importImage,&QAction::triggered,this,&MainWindow::sltImportImage);
    connect(spliteImage,&QAction::triggered,this,&MainWindow::sltSpliteImage);
    connect(saveImage,&QAction::triggered,this,&MainWindow::sltSaveImage);
    connect(calcImage,&QAction::triggered,this,&MainWindow::sltcalcImage);
}

void MainWindow::sltImportImage()
{
    QString imagePath = QFileDialog::getOpenFileName(this,"导入图片","./","*png *jpg");
    int imageWidth = 0,imageHeight = 0;
    ui->iamge->imageLoad(imagePath,imageWidth,imageHeight);
    ui->iamge->imageData();
    this->resize(imageWidth,imageHeight);
}

void MainWindow::sltSpliteImage()
{
    splite *_splite = new splite();
    _splite->show();
    connect(_splite,&splite::sign_spliteinfo,[=](int x,int y)
    {
        QList<QImage> imageItems;
        ui->iamge->iamgeItems(x,y,imageItems);
        ui->iamge->imageShow();
    });
}

void MainWindow::sltSaveImage()
{
    ui->iamge->imageSave();
}

void MainWindow::sltcalcImage()
{
	//设计中选择图像算法，注册对应图像算法，选择实现对应的图像算法
    //算法模块中，特意提供了将图像数据列表，方便算法操作。
    //近期会找一两个比较简单的图像算法来实现
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

splite::splite(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::splite)
{
    ui->setupUi(this);
    connect(ui->pushButton_right,&QPushButton::clicked,[=]()
    {
        emit sign_spliteinfo(ui->lineEdit_x->text().toInt(),ui->lineEdit_y->text().toInt());
        this->close();
    });
    connect(ui->pushButton_cancel,&QPushButton::clicked,[=]()
    {
        this->close();
    });
}