android - 我如何从andengine中的Sprite获取像素的颜色/alpha？

Question

如何在不创建任何额外位图的情况下从 andengine 中的 Sprite 获取像素的颜色/alpha？

Answer 1

我用这个函数解决了这个问题

private void loadObjectsMask()
    {
        InputStream in = null;
        Bitmap maskForObjects=null;
        try {
            final BitmapFactory.Options decodeOptions = new BitmapFactory.Options();
            decodeOptions.inPreferredConfig = Bitmap.Config.ARGB_4444;
            in = GameActivity.this.getAssets().open("images/" + BACKGROUND_PATH + getObjectImgFile());
            maskForObjects = BitmapFactory.decodeStream(in, null, decodeOptions);
        } catch (final IOException e) {

        } finally {
            StreamUtils.close(in);
        }
        if (maskForObjects != null)
        {
            objectsMask=new byte[maskForObjects.getWidth()][maskForObjects.getHeight()];
            for(int pw=0;pw<maskForObjects.getWidth();++pw)
            {
                for(int ph=0;ph<maskForObjects.getHeight();++ph)
                {
                    objectsMask[pw][ph]=(byte)(Color.alpha(maskForObjects.getPixel(pw, ph))==0?0:1);
                }
            }
            maskForObjects.recycle();
            System.out.printf("Bitmap size %d %d\n", maskForObjects.getWidth(),maskForObjects.getHeight());
        }
        else System.out.printf("Bitmap size error\n");
    }