/// <summary>
/// 获取图片
/// from和cache分开的逻辑可以实现加载本地文件但保存到内核cache
/// 或者加载dll文件但放到临时cache
/// 但是当不写明cache时，会根据from来对应出一个默认cache
/// </summary>
/// <param name="name"></param>
/// <param name="from">来源</param>
/// <param name="cache">保存到什么地方</param>
/// <returns></returns>
internal static Texture2D GetImage(string name, GraphicsFrom from, CacheKeep cache)
{
if (name == "")
{
return null;
}
Texture2D t = null;
//任意目录
if ((from & GraphicsFrom.Other) > 0)
{
t = getCache(name, cache);
if (t != null)
return t;
t = Texture2D.FromStream(GameMain.Instance.Device, RWExternal.GetFileStream(name));
if (t != null)
{
saveCache(name, t, cache);
return t;
}
return null; //对于other，不要执行后续逻辑
}
//data目录
if ((from & GraphicsFrom.File) > 0)
{
string localName = "data\\" + name;
t = getCache(localName, cache);
if (t != null)
return t;
t = Texture2D.FromStream(GameMain.Instance.Device, RWExternal.GetFileStream(localName));
if (t != null)
{
saveCache(name, t, cache);
return t;
}
}
if ((from & GraphicsFrom.Own) > 0)
{
t = getCache(name, cache);
if (t != null)
return t;
t = Texture2D.FromStream(GameMain.Instance.Device, mainDll.GetStream(name));
if (t != null)
{
saveCache(name, t, cache);
return t;
}
}
return null;
}
private static Dictionary<string, Texture2D> getDict(CacheKeep cache)
{
switch (cache)
{
case CacheKeep.Intern:
return internalRes;
case CacheKeep.Extern:
return externalRes;
case CacheKeep.Temp:
default:
return tempRes;
}
}
private static void saveCache(string name, Texture2D t, CacheKeep cache)
{
if (t == null)
{
return;
}
getDict(cache).Add(name, t);
}
private static Texture2D getCache(string name, CacheKeep cache)
{
Texture2D t = null;
if (getDict(cache).TryGetValue(name, out t))
{
return t;
}
return null;
}