// --------------------------------------------------------------------------------------------------------------------
// <copyright file="BitmapUtilities.cs" company="HandBrake Project (http://handbrake.fr)">
//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
//   Defines the BitmapUtilities type.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace HandBrakeWPF.Utilities
{
    using System;
    using System.Diagnostics;
    using System.Drawing;
    using System.Drawing.Imaging;
    using System.IO;
    using System.Runtime.InteropServices;
    using System.Windows.Media.Imaging;

    using HandBrake.Interop.Interop.Model.Preview;

    /// <summary>
    /// The bitmap utilities.
    /// </summary>
    public class BitmapUtilities
    {
        /// <summary>
        /// Convert a Bitmap to a BitmapImagetype.
        /// </summary>
        /// <param name="bitmap">
        /// The bitmap.
        /// </param>
        /// <returns>
        /// The <see cref="BitmapImage"/>.
        /// </returns>
        public static BitmapImage ConvertToBitmapImage(Bitmap bitmap)
        {
            // Create a Bitmap Image for display.
            using (var memoryStream = new MemoryStream())
            {
                try
                {
                    bitmap.Save(memoryStream, ImageFormat.Bmp);
                }
                finally
                {
                    bitmap.Dispose();
                }

                var wpfBitmap = new BitmapImage();
                wpfBitmap.BeginInit();
                wpfBitmap.CacheOption = BitmapCacheOption.OnLoad;
                wpfBitmap.StreamSource = memoryStream;
                wpfBitmap.EndInit();
                wpfBitmap.Freeze();

                return wpfBitmap;
            }
        }

        public static Bitmap ConvertByteArrayToBitmap(RawPreviewData previewData)
        {
            var bitmap = new Bitmap(previewData.Width, previewData.Height);

            BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, previewData.Width, previewData.Height), ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);

            IntPtr ptr = bitmapData.Scan0; // Pointer to the first pixel.
            for (int i = 0; i < previewData.Height; i++)
            {
                try
                {
                    Marshal.Copy(previewData.RawBitmapData, i * previewData.StrideWidth, ptr, previewData.StrideWidth);
                    ptr = IntPtr.Add(ptr, previewData.Width * 4);
                }
                catch (Exception exc)
                {
                    Debug.WriteLine(exc); // In theory, this will allow a partial image display if this happens. TODO add better logging of this.
                }
            }

            bitmap.UnlockBits(bitmapData);

            return bitmap;
        }
    }
}