188080501 / jqqmlimage Goto Github PK
View Code? Open in Web Editor NEWQML中Image控件升级版,利用预解码和预读取,提升图片加载速度
QML中Image控件升级版,利用预解码和预读取,提升图片加载速度
上面几行代码不是已经把data转成image并且赋值给_image 了吗?为什么又要重新load一次?这个地方没看懂。
测试QML里面的图片路径可不可以改成相对路径呢,另外这个最低支持到那个Qt版本呢
就是我想在QML 从本地文件夹不断获取图片显示 如何实现呢
const auto &&headData = jqicFile.read( sizeof( ImageInformationHead ) );
memcpy( &imageInformationHead, headData.constData(), sizeof( ImageInformationHead ) );
这两行代码可以简化为
jqicFile.read( reinterpret_cast<char*>( &imageInformationHead ), sizeof( ImageInformationHead ) );
实现类似placement new的效果,就地读取数据,节约一次memcpy的开销。
另外,我本来想着是否可以考虑使用QDataStream本身的序列化功能,但查询文档后得知,QImage序列化时是根据图像原始类型,保存为png或bmp。而如果要自己指定格式,则需要通过QBuffer+QImageIOHandler+QImageIOPlugin才行,这样的话反没手动处理来的简便了
能给个c++调用的demo吗?qml的不怎么用,不大明白
本地环境:qt5.7 无法直接运行
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