Qt实用技巧：使用Qt加载超大图片的耗时测试

2022-05-31 583

版权

本文内容由阿里云实名注册用户自发贡献，版权归原作者所有，阿里云开发者社区不拥有其著作权，亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容，填写侵权投诉表单进行举报，一经查实，本社区将立刻删除涉嫌侵权内容。

简介： Qt实用技巧：使用Qt加载超大图片的耗时测试

若该文为原创文章，未经允许不得转载

原博主博客地址：https://blog.csdn.net/qq21497936

原博主博客导航：https://blog.csdn.net/qq21497936/article/details/102478062

本文章博客地址：https://blog.csdn.net/qq21497936/article/details/85042037

各位读者，知识无穷而人力有穷，要么改需求，要么找专业人士，要么自己研究

红胖子(红模仿)的博文大全：开发技术集合（包含Qt实用技术、树莓派、三维、OpenCV、OpenGL、ffmpeg、OSG、单片机、软硬结合等等）持续更新中…（点击传送门）

Qt开发专栏：实用技巧（点击传送门）

需求

某机器人项目中，需要加载构建的地图，此处仅测试直接加载图片的时间。

测试代码

QString path;
path = "./map/1.png";
QFileInfo fileInfo;
fileInfo.setFile(path);
qDebug() << __FILE__ << __LINE__ << "Load file:" << path << " size:" << fileInfo.size();
qDebug() << __FILE__ << __LINE__ << "QImage start load, " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
if(!_image.load(path))
{
    qDebug() << __FILE__ << __LINE__ << "Failed to QImage load path:" << path;
}
qDebug() << __FILE__ << __LINE__ << "QImage end load,   " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
qDebug() << __FILE__ << __LINE__ << "QPixmap start load," 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
if(!_pixmap.load(path))
{
    qDebug() << __FILE__ << __LINE__ << "Failed to QPixmap load path:" << path;
}
qDebug() << __FILE__ << __LINE__ << "QPixmap end load,  " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
path = "./map/2.png";
fileInfo.setFile(path);
qDebug() << __FILE__ << __LINE__ << "Load file:" << path << " size:" << fileInfo.size();
qDebug() << __FILE__ << __LINE__ << "QImage start load, " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
if(!_image.load(path))
{
    qDebug() << __FILE__ << __LINE__ << "Failed to QImage load path:" << path;
}
qDebug() << __FILE__ << __LINE__ << "QImage end load,   " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
qDebug() << __FILE__ << __LINE__ << "QPixmap start load," 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
if(!_pixmap.load(path))
{
    qDebug() << __FILE__ << __LINE__ << "Failed to QPixmap load path:" << path;
}
qDebug() << __FILE__ << __LINE__ << "QPixmap end load,  " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
path = "./map/3.pgm";
fileInfo.setFile(path);
qDebug() << __FILE__ << __LINE__ << "Load file:" << path << " size:" << fileInfo.size();
qDebug() << __FILE__ << __LINE__ << "QImage start load, " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
if(!_image.load(path))
{
    qDebug() << __FILE__ << __LINE__ << "Failed to QImage load path:" << path;
}
qDebug() << __FILE__ << __LINE__ << "QImage end load,   " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
qDebug() << __FILE__ << __LINE__ << "QPixmap start load," 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");
if(!_pixmap.load(path))
{
    qDebug() << __FILE__ << __LINE__ << "Failed to QPixmap load path:" << path;
}
qDebug() << __FILE__ << __LINE__ << "QPixmap end load,  " 
         << QDateTime::currentDateTime().toString("hh:MM:ss:zzz");