目前使用GPUImage和GLSurfaceView实现了一个滤镜相机的效果，但是当后置摄像头切换到前置摄像头后，前置画面不能全屏，这个问题很困恼。
查看了GPUImage的源码，在TextureRotationUtil类中，根据旋转角度会得到一个8位的数组，现在想请问这8位的数字各代表什么意思？
TextureRotationUtil类的源码如下：

public class TextureRotationUtil { public static final float TEXTURE_NO_ROTATION[] = { 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, }; public static final float TEXTURE_ROTATED_90[] = { 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, }; public static final float TEXTURE_ROTATED_180[] = { 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, }; public static final float TEXTURE_ROTATED_270[] = { 0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, }; private TextureRotationUtil() { } public static float[] getRotation(final Rotation rotation, final boolean flipHorizontal, final boolean flipVertical) { float[] rotatedTex; switch (rotation) { case ROTATION_90: rotatedTex = TEXTURE_ROTATED_90; break; case ROTATION_180: rotatedTex = TEXTURE_ROTATED_180; break; case ROTATION_270: rotatedTex = TEXTURE_ROTATED_270; break; case NORMAL: default: rotatedTex = TEXTURE_NO_ROTATION; break; } if (flipHorizontal) { rotatedTex = new float[]{ flip(rotatedTex[0]), rotatedTex[1], flip(rotatedTex[2]), rotatedTex[3], flip(rotatedTex[4]), rotatedTex[5], flip(rotatedTex[6]), rotatedTex[7], }; } if (flipVertical) { rotatedTex = new float[]{ rotatedTex[0], flip(rotatedTex[1]), rotatedTex[2], flip(rotatedTex[3]), rotatedTex[4], flip(rotatedTex[5]), rotatedTex[6], flip(rotatedTex[7]), }; } return rotatedTex; } private static float flip(final float i) { if (i == 0.0f) { return 1.0f; } return 0.0f; } }