Android OpenGL Screenshot

Question

I\'ve searched a lot about taking screenshot of my OpenGL object on Android and come up with this solution. It worked great but in my case I have camera view and opengl view

Answer 1

I used following method and worked like a champ.

public static Bitmap SavePixels(int x, int y, int w, int h, GL10 gl)
{  
     int b[]=new int[w*(y+h)];
     int bt[]=new int[w*h];
     IntBuffer ib=IntBuffer.wrap(b);
     ib.position(0);
     gl.glReadPixels(x, 0, w, y+h, GL10.GL_RGBA, GL10.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;
}

You just need to call

YourClass.SavePixels(0,0,width,height,gl);

I hope this will work for you...

Thanks, Midhun

Answer 2

The solution you mentioned is using a Bitmap.Config.RGB_565 which doesn't support alpha channels.

Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);

Instead you should use Bitmap.Config.ARGB_8888 or Bitmap.Config.ARGB_4444.