Java TGA加载器 [英] Java TGA loader

问题描述

我正在为java寻找一个小而免费的TGA图像加载类或库。
理想情况下，结果是BufferedImage。

I am looking for a small and free TGA image loading class or library for java. Ideally the result is a BufferedImage.

是的，我已经google了，但是大多数结果已经过时，或者是包含很多其他内容的相当大的库我不需要的东西。我正在寻找一些简单易读的TGA图像。

Yes, I have already googled, but most results are outdated, or are quite big libraries that contain a lot of other stuff i dont need. I am looking for something small and simple that reads just TGA images.

谢谢！

推荐答案

我们使用从某个开源项目复制的这个类来读取TGA文件。它真的很老了。它只能处理具有最基本编码的Targa文件。试一试。

We use this class copied from some open source project to read TGA files. It's really old. It can only handle Targa files with most basic encoding. Give it a try.

public class TargaReader
{
        public static Image getImage(String fileName) throws IOException
        {
                File f = new File(fileName);
                byte[] buf = new byte[(int)f.length()];
                BufferedInputStream bis = new BufferedInputStream(new FileInputStream(f));
                bis.read(buf);
                bis.close();
                return decode(buf);
        }

        private static int offset;

        private static int btoi(byte b)
        {
                int a = b;
                return (a<0?256+a:a);
        }

        private static int read(byte[] buf)
        {
                return btoi(buf[offset++]);
        }

        public static Image decode(byte[] buf) throws IOException
        {
                offset = 0;

                // Reading header
                for (int i=0;i<12;i++)
                        read(buf);
                int width = read(buf)+(read(buf)<<8);
                int height = read(buf)+(read(buf)<<8);
                read(buf);
                read(buf);

                // Reading data
                int n = width*height;
                int[] pixels = new int[n];
                int idx=0;

                while (n>0)
                {
                        int nb = read(buf);
                        if ((nb&0x80)==0)
                        {
                                for (int i=0;i<=nb;i++)
                                {
                                        int b = read(buf);
                                        int g = read(buf);
                                        int r = read(buf);
                                        pixels[idx++] = 0xff000000 | (r<<16) | (g<<8) | b;
                                }
                        }
                        else
                        {
                                nb &= 0x7f;
                                int b = read(buf);
                                int g = read(buf);
                                int r = read(buf);
                                int v = 0xff000000 | (r<<16) | (g<<8) | b;
                                for (int i=0;i<=nb;i++)
                                        pixels[idx++] = v;
                        }
                        n-=nb+1;
                }

                BufferedImage bimg = new BufferedImage(width,height,BufferedImage.TYPE_INT_ARGB);
                bimg.setRGB(0,0,width,height,pixels,0,width);
                return bimg;
        }
}

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