在Qt中处理非常大的图像

本文介绍了在Qt中处理非常大的图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我无法让Qt处理超过10,000X10,000的图片。我处理的是大约2GB的巨大卫星图像。我考虑使用内存映射，但映像仍占用内存中的空间。

I can't get Qt to work on images beyond 10,000X10,000. I'm dealing with huge satellite images that are around 2GB each. I considered using memory mapping but the image still occupies space in memory.

QFile file("c://qt//a.ras"); file.open(QIODevice::ReadOnly); qint64 size = file.size(); uchar *img=file.map(0,size); QImage I(img,w,h,QImage::Format_ARGB32);

任何人都能告诉我一种更有效的方式来处理Qt中的大图片？

Can anyone tell me a more efficient way to deal with large images in Qt?

推荐答案

Qgraphicsview 和一组图像图块，视图处理所有的滚动和世界坐标为你。 然后你只需要将图像预先切成瓷砖或提前一段图像数据

Qgraphicsview and a set of image tiles, the view handles all the scrolling and world coords for you. Then you just have to either pre-chop the images into tiles in advance or pull a section of image data on the fly