using System;
using UnityEngine;

namespace PWCommon1
{
	[Serializable]
	public class UBrush
	{
		private float[] m_Strength;

		private Texture2D m_Brush;

		private const int MIN_BRUSH_SIZE = 3;

		public int Size { get; private set; }

		public bool Load(Texture2D brushTex, int size)
		{
			if (m_Brush == brushTex && size == Size && m_Strength != null)
			{
				return true;
			}
			if (brushTex != null)
			{
				float num = size;
				Size = size;
				m_Strength = new float[Size * Size];
				if (Size > 3)
				{
					for (int i = 0; i < Size; i++)
					{
						for (int j = 0; j < Size; j++)
						{
							m_Strength[i * Size + j] = brushTex.GetPixelBilinear(((float)j + 0.5f) / num, (float)i / num).a;
						}
					}
				}
				else
				{
					for (int k = 0; k < m_Strength.Length; k++)
					{
						m_Strength[k] = 1f;
					}
				}
				m_Brush = brushTex;
				return true;
			}
			m_Strength = new float[1];
			m_Strength[0] = 1f;
			Size = 1;
			return false;
		}

		public float GetStrengthAtCoords(int ix, int iy)
		{
			ix = Mathf.Clamp(ix, 0, Size - 1);
			iy = Mathf.Clamp(iy, 0, Size - 1);
			return m_Strength[iy * Size + ix];
		}
	}
}