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/*
 * Copyright (c) 2006-2014, openmetaverse.org
 * All rights reserved.
 *
 * - Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Neither the name of the openmetaverse.org nor the names
 *   of its contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using OpenMetaverse;
using OpenMetaverse.Imaging;

namespace OpenMetaverse.Assets
{
    /// <summary>
    /// Represents a texture
    /// </summary>
    public class AssetTexture : Asset
    {
        /// <summary>Override the base classes AssetType</summary>
        public override AssetType AssetType { get { return AssetType.Texture; } }

        /// <summary>A <seealso cref="ManagedImage"/> object containing image data</summary>
        public ManagedImage Image;

        /// <summary></summary>
        public OpenJPEG.J2KLayerInfo[] LayerInfo;

        /// <summary></summary>
        public int Components;

        /// <summary>Initializes a new instance of an AssetTexture object</summary>
        public AssetTexture() { }

        /// <summary>
        /// Initializes a new instance of an AssetTexture object
        /// </summary>
        /// <param name="assetID">A unique <see cref="UUID"/> specific to this asset</param>
        /// <param name="assetData">A byte array containing the raw asset data</param>
        public AssetTexture(UUID assetID, byte[] assetData) : base(assetID, assetData) { }

        /// <summary>
        /// Initializes a new instance of an AssetTexture object
        /// </summary>
        /// <param name="image">A <seealso cref="ManagedImage"/> object containing texture data</param>
        public AssetTexture(ManagedImage image)
        {
            Image = image;
            Components = 0;
            if ((Image.Channels & ManagedImage.ImageChannels.Color) != 0)
                Components += 3;
            if ((Image.Channels & ManagedImage.ImageChannels.Gray) != 0)
                ++Components;
            if ((Image.Channels & ManagedImage.ImageChannels.Bump) != 0)
                ++Components;
            if ((Image.Channels & ManagedImage.ImageChannels.Alpha) != 0)
                ++Components;
        }

        /// <summary>
        /// Populates the <seealso cref="AssetData"/> byte array with a JPEG2000
        /// encoded image created from the data in <seealso cref="Image"/>
        /// </summary>
        public override void Encode()
        {
            AssetData = OpenJPEG.Encode(Image);
        }

        /// <summary>
        /// Decodes the JPEG2000 data in <code>AssetData</code> to the
        /// <seealso cref="ManagedImage"/> object <seealso cref="Image"/>
        /// </summary>
        /// <returns>True if the decoding was successful, otherwise false</returns>
        public override bool Decode()
        {
            if (AssetData != null && AssetData.Length > 0)
            {
                this.Components = 0;

                if (OpenJPEG.DecodeToImage(AssetData, out Image))
                {
                    if ((Image.Channels & ManagedImage.ImageChannels.Color) != 0)
                        Components += 3;
                    if ((Image.Channels & ManagedImage.ImageChannels.Gray) != 0)
                        ++Components;
                    if ((Image.Channels & ManagedImage.ImageChannels.Bump) != 0)
                        ++Components;
                    if ((Image.Channels & ManagedImage.ImageChannels.Alpha) != 0)
                        ++Components;

                    return true;
                }
            }

            return false;
        }

        /// <summary>
        /// Decodes the begin and end byte positions for each quality layer in
        /// the image
        /// </summary>
        /// <returns></returns>
        public bool DecodeLayerBoundaries()
        {
            return OpenJPEG.DecodeLayerBoundaries(AssetData, out LayerInfo, out Components);
        }
    }
}