德尔福的默认JPEG库是极其缓慢。如何提高它的性能?我需要更快的保存和加载JPEG图像。
我只测试了Jpeg.TJPEGImage
你可以使用的libjpeg或libJpegTurbo。后者无疑是非常快的。
从单位:
{
libJPEG Header conversion by Steffen Xonna. (21-03-2008)
http://www.dev-center.de/index.php?cat=header&file=libjpeg
Below you find an copy from the original libJPEG header.
/* jpeglib.h
*
* Copyright (C) 1991-1998, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file defines the application interface for the JPEG library.
* Most applications using the library need only include this file,
* and perhaps jerror.h if they want to know the exact error codes.
*/
}
我们有一个JPEG解压缩,将解压缩超过每秒350万像素(超过700万像素,如果在代码重新标记)。同时提取每秒超过3000缩略图。这不包括读取压缩代码到内存中的时间。看看www.instantimage.com。也很扎实,将解压许多JPEG图像的微软Windows软件不会。