NoiseEffect.java 文件源码

public NoiseEffect(Bitmap bitmap, int grainFPS, float scale) {
    super(bitmap, 0, 0);
    shader = new BitmapShader(bitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
    matrix = new Matrix();

    shader.setLocalMatrix(matrix);
    paint.setShader(shader);
    paint.setAlpha(144);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
    lastGrainOffset = System.currentTimeMillis();
    this.grainFPS = grainFPS;
    this.scale=scale;
}