Décoder et encoder la texture à l'aide de System.Drawing

En utilisant Aspose.3D for .NET, les développeurs utilisent des encodeurs et des décodeurs d’image externes pour charger des textures ou enregistrer des textures dans différents formats d’image.

Implémenter un codec de texture à l’aide de System.Drawing

Utilisez la classe suivante pour définir les encodeurs de texture et le décodeur de texture:

using System;
using System.Collections.Generic;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using Aspose.ThreeD.Render;
using System.Runtime.InteropServices;

namespace Aspose.ThreeD
{
    /// <summary>
    /// Uses System.Drawing for encoding/decoding textures for Aspose.3D textures.
    /// </summary>
    public class GdiPlusCodec : ITextureCodec, ITextureDecoder
    {
        class GdiPlusEncoder : ITextureEncoder
        {
            public string FileExtension { get; }
            private ImageCodecInfo encoder;
            public GdiPlusEncoder(ImageCodecInfo encoder, string ext)
            {
                this.encoder = encoder;
                FileExtension = ext;
            }

            public void Encode(TextureData texture, Stream stream)
            {
                var bmp = ToBitmap(texture);
                bmp.Save(stream, encoder, null);
            }
        }
        /// <summary>
        /// Convert <see cref="TextureData"/> to <see cref="Bitmap"/>
        /// </summary>
        /// <param name="td"></param>
        /// <returns></returns>
        public static Bitmap ToBitmap(TextureData td)
        {
            using (var map = td.MapPixels(PixelMapMode.ReadOnly, Render.PixelFormat.A8R8G8B8))
            {
                var ret = new Bitmap(td.Width, td.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
                var bits = ret.LockBits(new Rectangle(0, 0, td.Width, td.Height), ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
                for (int y = 0; y < td.Height; y++)
                {
                    var srcOffset = y * map.Stride;
                    var destination = bits.Scan0 + y * bits.Stride;
                    Marshal.Copy(map.Data, srcOffset, destination, map.Stride);
                }
                ret.UnlockBits(bits);
                return ret;
            }
        }

        /// <summary>
        /// Convert <see cref="Bitmap"/> to <see cref="TextureData"/>
        /// </summary>
        /// <param name="img"></param>
        /// <param name="reverseY"></param>
        /// <returns></returns>
        public static TextureData ToTextureData(Bitmap img, bool reverseY)
        {
            var ret = new TextureData(img.Width, img.Height, Render.PixelFormat.A8R8G8B8);
            var bits = img.LockBits(new Rectangle(0, 0, img.Width, img.Height), ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            using (var map = ret.MapPixels(PixelMapMode.WriteOnly))
            {
                for (int y = 0; y < map.Height; y++)
                {
                    IntPtr srcPtr = bits.Scan0;
                    if(reverseY)
                        srcPtr += (map.Height - y - 1) * bits.Stride;
                    else
                        srcPtr += y * bits.Stride;
                    var dstOffset = y * map.Stride;
                    Marshal.Copy(srcPtr, map.Data, dstOffset, map.Stride);
                }
            }
            img.UnlockBits(bits);
            return ret;
        }
        /// <summary>
        /// Decode texture from stream, return null if failed to decode.
        /// </summary>
        /// <param name="stream">Texture data source stream</param>
        /// <param name="reverseY">Flip the texture</param>
        /// <returns>Decoded texture data or null if not supported.</returns>
        public TextureData Decode(Stream stream, bool reverseY)
        {
            using (var img = (Bitmap)Image.FromStream(stream))
            {
                var ret = ToTextureData(img, reverseY);
                return ret;
            }
        }
        /// <summary>
        /// Gets supported texture decoders.
        /// </summary>
        /// <returns></returns>
        public ITextureDecoder[] GetDecoders()
        {
            return new ITextureDecoder[] { this };
        }
        /// <summary>
        /// Gets supported texture encoders. 
        /// </summary>
        /// <returns></returns>
        public ITextureEncoder[] GetEncoders()
        {
            List<ITextureEncoder> ret = new List<ITextureEncoder>();
            foreach (var encoder in ImageCodecInfo.GetImageEncoders())
            {
                if (encoder.FilenameExtension == null)
                    continue;
                var exts = encoder.FilenameExtension.Split(';');
                foreach(var fileExt in exts)
                {
                    var ext = fileExt;
                    int p = ext.IndexOf('.');
                    if (p != -1)
                        ext = ext.Substring(p + 1);
                    ret.Add(new GdiPlusEncoder(encoder, ext.ToLowerInvariant()));
                }
            }
            return ret.ToArray();
        }
    }
}

Enregistrez-le dans Aspose.3D

Maintenant, enregistrons-le dans Aspsoe.3D:

    Aspose.ThreeD.Render.TextureCodec.RegisterCodec(new Aspose.ThreeD.GdiPlusCodec());

Lorsque ce codec a été enregistré, tous les formats d’image pris en charge par System.Drawing peuvent être utilisés dans TextureData.Save.