[Cocos2D中]如何从GlSurfaceView创建位图 [英] [Cocos2d]How to Create bitmap from GlSurfaceView

问题描述

我如何采取屏幕快照Glsurfaceview的在cocos2d。我尝试使用下面的code GLsurfaceView

How can I take screen shot of Glsurfaceview in Cocos2d. I tried with following code using GLsurfaceView

    GlsurfaceView glv=CCDirector.sharedDirector().getOpenGLView();
    glv.setDrawingCacheEnabled(true);
    Bitmap bitmap=glv.getDrawingCache();

但它返回透明的形象。

but it return transparent image.

推荐答案

我是从这个 anddev论坛的问题我连着code随着这个​​希望有人会发现这是很有帮助的。

I got answer from this anddev forum question I attached code along with this hope somebody will find this helpful

请把里面的渲染器类的OnDraw方法将此code内启动。

Please Put this code inside renderer class onDraw Method inside starting.

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

    /*  remember, that OpenGL bitmap is incompatible with 
        Android bitmap and so, some correction need.
     */   
    for(int i=0; i<h; i++)
    {         
        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-i-1)*w+j]=pix1;
        }
    }              
    Bitmap sb=Bitmap.createBitmap(bt, w, h, true);
    return sb;
}

public static void SavePNG(int x, int y, int w, int h, String name, GL10 gl)
{
    Bitmap bmp=SavePixels(x,y,w,h,gl);
    try
    {
        FileOutputStream fos=new FileOutputStream("/sdcard/my_app/"+name);
        bmp.compress(CompressFormat.PNG, 100, fos);
        try
        {
            fos.flush();
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try
        {
            fos.close();
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    catch (FileNotFoundException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }              
}

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