QBitmap和QPixmap的区别

#include "widget.h"
#include "ui_widget.h"
#include<QPainter>
#include<QBitmap>
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::paintEvent(QPaintEvent *)
{
    QPainter p(this);

    //QPixmap 图片背景白色
    p.drawPixmap(0,0,QPixmap(":/new/prefix1/image/小路飞.jpg"));
    //QBitmap图片背景白色
     p.drawPixmap(200,0,QBitmap(":/new/prefix1/image/小路飞.jpg"));

     //QPixmap 图片背景透明
     QPixmap pixmap;
     pixmap.load(":/new/prefix1/image/透明路飞.png");
     p.drawPixmap(0,200,pixmap);

     //QBitmap图片背景透明
     QBitmap bitmap;
     bitmap.load(":/new/prefix1/image/透明路飞.png");
      p.drawPixmap(800,200,bitmap);



}