//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="Pixels"
// Project: StgSharp
// AuthorGroup: Nitload Space
// Copyright (c) Nitload Space. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;

namespace StgSharp.Graphics
{
    public interface IPixel
    {

        public float Red { get; set; }

        public float Green { get; set; }

        public float Blue { get; set; }

        public float Alpha { get; set; }

        internal int Size { get; }

    }

    [StructLayout(LayoutKind.Explicit, Size = 32)]
    public unsafe struct Pixel32RGBA : IPixel
    {

        [FieldOffset(0)] private unsafe fixed byte data[4];
        [FieldOffset(0)] private readonly int mask;

        public readonly int Size => 4;

        public override bool Equals(object obj)
        {
            return obj is not null && obj is Pixel32RGBA pixel && this == pixel;
        }

        public override readonly int GetHashCode()
        {
            return mask.GetHashCode();
        }

        public static bool operator !=(Pixel32RGBA left, Pixel32RGBA right)
        {
            return !(left == right);
        }

        public static bool operator ==(Pixel32RGBA left, Pixel32RGBA right)
        {
            return left.mask == right.mask;
        }

        float IPixel.Alpha
        {
            get => data[3] / 256;
            set => data[3] = (byte)(value * 256);
        }

        float IPixel.Blue
        {
            get => data[2] / 256;
            set => data[2] = (byte)(value * 256);
        }

        float IPixel.Green
        {
            get => data[1] / 256;
            set => data[1] = (byte)(value * 256);
        }

        float IPixel.Red
        {
            get => data[0] / 256;
            set => data[0] = (byte)(value * 256);
        }

    }
}