如何在Android中将opengl纹理转换回位图? [英] How do you convert opengl texture back to bitmap in android?

问题描述

我想将图像过滤器应用于我的图像，并使用

I wanted to apply image-filter to my image and used android HelloEffects sample

它将图像数据从位图转换为纹理.
应用图像滤镜效果后，我想以jpeg格式恢复图像，但是不知道该怎么做.

It converts the image data from bitmap to texture.
After applying the image filter effect, I'd like to get the image back in jpeg format, but don't know how to do that.

推荐答案

我以类似的方式做到了这一点，

I did this in one way like ,

1. 我使用glreadpixles()方法将纹理图像转换为位图

1. I converted the texture image into bitmap using glreadpixles() method

然后我将位图保存到sd卡

I then saved the bitmap to the sd card

纹理到位图代码

public static Bitmap SavePixels(int x, int y, int w, int h){
    int b[]=new int[w*(y+h)];
    int bt[]=new int[w*h];
    IntBuffer ib = IntBuffer.wrap(b);
    ib.position(0);
    GLES20.glReadPixels(0, 0, w, h, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);

    for(int i=0, k=0; i<h; i++, k++)
    {//remember, that OpenGL bitmap is incompatible with Android bitmap
        //and so, some correction need.
        for(int j=0; j<w; j++)
        {
            int pix=b[i*w+j];
            int pb=(pix>>16)&0xff;
            int pr=(pix<<16)&0x00ff0000;
            int pix1=(pix&0xff00ff00) | pr | pb;
            bt[(h-k-1)*w+j]=pix1;
        }
    }

    Bitmap sb=Bitmap.createBitmap(bt, w, h, Bitmap.Config.ARGB_8888);
    return sb;
}

位图到内部存储代码，

 public  static void saveImage(Bitmap finalBitmap) {

    File myDir=new File("/sdcard/saved_images");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete ();
    try {
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

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