using System;
using System.Globalization;
using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using StardewModdingAPI.Framework.Exceptions;
using StardewModdingAPI.Framework.Reflection;
using StardewValley;
namespace StardewModdingAPI.Framework.ContentManagers
{
/// <summary>A content manager which handles reading files from a SMAPI mod folder with support for unpacked files.</summary>
internal class ModContentManager : BaseContentManager
{
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="name">A name for the mod manager. Not guaranteed to be unique.</param>
/// <param name="serviceProvider">The service provider to use to locate services.</param>
/// <param name="rootDirectory">The root directory to search for content.</param>
/// <param name="currentCulture">The current culture for which to localise content.</param>
/// <param name="coordinator">The central coordinator which manages content managers.</param>
/// <param name="monitor">Encapsulates monitoring and logging.</param>
/// <param name="reflection">Simplifies access to private code.</param>
/// <param name="onDisposing">A callback to invoke when the content manager is being disposed.</param>
public ModContentManager(string name, IServiceProvider serviceProvider, string rootDirectory, CultureInfo currentCulture, ContentCoordinator coordinator, IMonitor monitor, Reflector reflection, Action<BaseContentManager> onDisposing)
: base(name, serviceProvider, rootDirectory, currentCulture, coordinator, monitor, reflection, onDisposing, isModFolder: true) { }
/// <summary>Load an asset that has been processed by the content pipeline.</summary>
/// <typeparam name="T">The type of asset to load.</typeparam>
/// <param name="assetName">The asset path relative to the loader root directory, not including the <c>.xnb</c> extension.</param>
/// <param name="language">The language code for which to load content.</param>
public override T Load<T>(string assetName, LanguageCode language)
{
assetName = this.AssertAndNormaliseAssetName(assetName);
// get from cache
if (this.IsLoaded(assetName))
return base.Load<T>(assetName, language);
// get managed asset
if (this.Coordinator.TryParseManagedAssetKey(assetName, out string contentManagerID, out string relativePath))
{
if (contentManagerID != this.Name)
{
T data = this.Coordinator.LoadAndCloneManagedAsset<T>(assetName, contentManagerID, relativePath, language);
this.Inject(assetName, data);
return data;
}
return this.LoadManagedAsset<T>(assetName, contentManagerID, relativePath, language);
}
throw new NotSupportedException("Can't load content folder asset from a mod content manager.");
}
/// <summary>Create a new content manager for temporary use.</summary>
public override LocalizedContentManager CreateTemporary()
{
throw new NotSupportedException("Can't create a temporary mod content manager.");
}
/*********
** Private methods
*********/
/// <summary>Get whether an asset has already been loaded.</summary>
/// <param name="normalisedAssetName">The normalised asset name.</param>
protected override bool IsNormalisedKeyLoaded(string normalisedAssetName)
{
return this.Cache.ContainsKey(normalisedAssetName);
}
/// <summary>Load a managed mod asset.</summary>
/// <typeparam name="T">The type of asset to load.</typeparam>
/// <param name="internalKey">The internal asset key.</param>
/// <param name="contentManagerID">The unique name for the content manager which should load this asset.</param>
/// <param name="relativePath">The relative path within the mod folder.</param>
/// <param name="language">The language code for which to load content.</param>
private T LoadManagedAsset<T>(string internalKey, string contentManagerID, string relativePath, LanguageCode language)
{
SContentLoadException GetContentError(string reasonPhrase) => new SContentLoadException($"Failed loading asset '{relativePath}' from {contentManagerID}: {reasonPhrase}");
try
{
// get file
FileInfo file = this.GetModFile(relativePath);
if (!file.Exists)
throw GetContentError("the specified path doesn't exist.");
// load content
switch (file.Extension.ToLower())
{
// XNB file
case ".xnb":
return base.Load<T>(relativePath, language);
// unpacked map
case ".tbin":
throw GetContentError($"can't read unpacked map file directly from the underlying content manager. It must be loaded through the mod's {typeof(IModHelper)}.{nameof(IModHelper.Content)} helper.");
// unpacked image
case ".png":
// validate
if (typeof(T) != typeof(Texture2D))
throw GetContentError($"can't read file with extension '{file.Extension}' as type '{typeof(T)}'; must be type '{typeof(Texture2D)}'.");
// fetch & cache
using (FileStream stream = File.OpenRead(file.FullName))
{
Texture2D texture = Texture2D.FromStream(Game1.graphics.GraphicsDevice, stream);
texture = this.PremultiplyTransparency(texture);
this.Inject(internalKey, texture);
return (T)(object)texture;
}
default:
throw GetContentError($"unknown file extension '{file.Extension}'; must be one of '.png', '.tbin', or '.xnb'.");
}
}
catch (Exception ex) when (!(ex is SContentLoadException))
{
if (ex.GetInnermostException() is DllNotFoundException dllEx && dllEx.Message == "libgdiplus.dylib")
throw GetContentError("couldn't find libgdiplus, which is needed to load mod images. Make sure Mono is installed and you're running the game through the normal launcher.");
throw new SContentLoadException($"The content manager failed loading content asset '{relativePath}' from {contentManagerID}.", ex);
}
}
/// <summary>Get a file from the mod folder.</summary>
/// <param name="path">The asset path relative to the content folder.</param>
private FileInfo GetModFile(string path)
{
// try exact match
FileInfo file = new FileInfo(Path.Combine(this.FullRootDirectory, path));
// try with default extension
if (!file.Exists && file.Extension.ToLower() != ".xnb")
{
FileInfo result = new FileInfo(file.FullName + ".xnb");
if (result.Exists)
file = result;
}
return file;
}
/// <summary>Premultiply a texture's alpha values to avoid transparency issues in the game. This is only possible if the game isn't currently drawing.</summary>
/// <param name="texture">The texture to premultiply.</param>
/// <returns>Returns a premultiplied texture.</returns>
/// <remarks>Based on <a href="https://gist.github.com/Layoric/6255384">code by Layoric</a>.</remarks>
private Texture2D PremultiplyTransparency(Texture2D texture)
{
// validate
if (Context.IsInDrawLoop)
throw new NotSupportedException("Can't load a PNG file while the game is drawing to the screen. Make sure you load content outside the draw loop.");
// process texture
SpriteBatch spriteBatch = Game1.spriteBatch;
GraphicsDevice gpu = Game1.graphics.GraphicsDevice;
using (RenderTarget2D renderTarget = new RenderTarget2D(Game1.graphics.GraphicsDevice, texture.Width, texture.Height))
{
// create blank render target to premultiply
gpu.SetRenderTarget(renderTarget);
gpu.Clear(Color.Black);
// multiply each color by the source alpha, and write just the color values into the final texture
spriteBatch.Begin(SpriteSortMode.Immediate, new BlendState
{
ColorDestinationBlend = Blend.Zero,
ColorWriteChannels = ColorWriteChannels.Red | ColorWriteChannels.Green | ColorWriteChannels.Blue,
AlphaDestinationBlend = Blend.Zero,
AlphaSourceBlend = Blend.SourceAlpha,
ColorSourceBlend = Blend.SourceAlpha
});
spriteBatch.Draw(texture, texture.Bounds, Color.White);
spriteBatch.End();
// copy the alpha values from the source texture into the final one without multiplying them
spriteBatch.Begin(SpriteSortMode.Immediate, new BlendState
{
ColorWriteChannels = ColorWriteChannels.Alpha,
AlphaDestinationBlend = Blend.Zero,
ColorDestinationBlend = Blend.Zero,
AlphaSourceBlend = Blend.One,
ColorSourceBlend = Blend.One
});
spriteBatch.Draw(texture, texture.Bounds, Color.White);
spriteBatch.End();
// release GPU
gpu.SetRenderTarget(null);
// extract premultiplied data
Color[] data = new Color[texture.Width * texture.Height];
renderTarget.GetData(data);
// unset texture from GPU to regain control
gpu.Textures[0] = null;
// update texture with premultiplied data
texture.SetData(data);
}
return texture;
}
}
}