// Copyright © 2010-2017 The CefSharp Authors. All rights reserved.

//

// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Runtime.InteropServices;

using CefSharp.Structs;

namespace CefSharp.OffScreen

{

public class BitmapBuffer

{

private const int BytesPerPixel = 4;

private const PixelFormat Format = PixelFormat.Format32bppPArgb;

private byte[] buffer;

/// <summary>

/// Number of bytes

/// </summary>

public int NumberOfBytes { get; private set; }

/// <summary>

/// Width

/// </summary>

public int Width { get; private set; }

/// <summary>

/// Height

/// </summary>

public int Height { get; private set; }

/// <summary>

/// Dirty Rect - unified region containing th

/// </summary>

public Rect DirtyRect { get; private set; }

public object BitmapLock { get; private set; }

public BitmapBuffer(object bitmapLock)

{

BitmapLock = bitmapLock;

}

public byte[] Buffer

{

get { return buffer; }

}

//TODO: May need to Pin the buffer in memory using GCHandle.Alloc(this.buffer, GCHandleType.Pinned);

private void ResizeBuffer(int width, int height)

{

if (buffer == null || width != Width || height != Height)

{

//No of Pixels (width * height) * BytesPerPixel

NumberOfBytes = width * height * BytesPerPixel;

buffer = new byte[NumberOfBytes];

Width = width;

Height = height;

}

}

public void UpdateBuffer(int width, int height, IntPtr buffer, Rect dirtyRect)

{

lock (BitmapLock)

{

DirtyRect = dirtyRect;

ResizeBuffer(width, height);

Marshal.Copy(buffer, this.buffer, 0, NumberOfBytes);

}

}

public Bitmap CreateBitmap()

{

lock (BitmapLock)

{

if (Width == 0 || Height == 0 || buffer.Length == 0)

{

return null;

}

var bitmap = new Bitmap(Width, Height, Format);

var bitmapData = bitmap.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.WriteOnly, Format);

Marshal.Copy(Buffer, 0, bitmapData.Scan0, NumberOfBytes);

bitmap.UnlockBits(bitmapData);

return bitmap;

}

}

}

}