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我正在寻找将图像从 GPU 下载到文件的最快方法，以便稍后在同一个应用程序中加载（因此不一定是 PNG，例如）。

但是我注意到，当我直接使用 DeflaterStream 时，它比带有 DeflaterStream 的 ImageIO 慢得多（因此使用 ImageIO.write(deflaterstream) ）。

难道我做错了什么？还是 ImageIO 只是经过高度优化/比最快的 GZIP 压缩更好？

  glBindTexture(GL_TEXTURE_2D, textureId);

        int bpp = 4; // Assuming a 32-bit display with a byte each for red, green, blue, and alpha.
        ByteBuffer buffer = BufferUtils.createByteBuffer(SAVE_WIDTH * SAVE_HEIGHT * bpp);
        glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA8, GL_UNSIGNED_BYTE, buffer );

//        File file = new File("saves/s-" + layer + ".png"); // The file to save to.
        String format = "png"; // Example: "PNG" or "JPG"
//        BufferedImage image = new BufferedImage(SAVE_WIDTH, SAVE_HEIGHT, BufferedImage.TYPE_INT_ARGB);

        try {
            FileOutputStream bOut = new FileOutputStream("saves/p-"+ layer + ".gz");
            DeflaterOutputStream  gzipOut = new DeflaterOutputStream (bOut, new Deflater(Deflater.BEST_SPEED));
            //buffer.flip();
            System.out.println("Bytes remaining " + buffer.remaining());
            while (buffer.hasRemaining()) gzipOut.write(buffer.get());
            gzipOut.close();
            bOut.close();
        } catch (IOException ex) {
            Logger.getLogger(SaveStateManager.class.getName()).log(Level.SEVERE, null, ex);
        }
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1 回答 1

1

压缩总是很昂贵，但你可以通过

OutputStream bOut = new BufferedOutputStream(new FileOutputStream("saves/p-" + layer + ".gz"));
DeflaterOutputStream defOut = new DeflaterOutputStream(bOut, new Deflater(Deflater.BEST_SPEED));
//buffer.flip();
byte[] bytes = new byte[1024];
while (buffer.hasRemaining()) {
    int len = Math.min(buffer.remaining(), bytes.length);
    buffer.get(bytes, 0, len);
    defOut.write(bytes, 0, len);
}
defOut.close();
于 2013-01-09T13:27:10.493 回答