在 DirectX 中仅加载纹理的一部分？
如果我有一个纹理文件，如何使用定义的矩形（上、左、下、右）仅加载它的一部分？
从技术上讲，是否可以只读取我想要加载的部分，而保持纹理的其余部分不变？
If I have a texture file how would I be able to load up only a part of it using a defined rect (top, left, bottom, right)?
Is it technically possibly to only read in the parts I want to load while leaving the rest of the texture untouched?
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您到底想实现什么目标。仅将文件的一小部分加载到包含所有文件的单个纹理中非常简单。不过，您可能需要编写自己的图像解析器。
如果您想将部分图像加载到与原始图像大小相同的纹理中（即仅更新您所在的区域），那么这也相对简单。您可以使用要更新的区域的矩形来锁定Rcts。不过，您仍然需要编写自己的图像解析器。
就我个人而言，在这种情况下，我更喜欢使用自己的纹理格式，该格式已经是我想要的格式......
What exactly are you trying to achieve. Its pretty simple to load up only a small part of a file into a single texture that encompasses it all. You'll probably need to write your own image parser, though.
If you want to load a partial image into a texture thats the same size as the original image (ie only update the area you are after) then this is relaitvely simple as well. You can LockRcts with a rect that is the area you want you update. You'll still need to write your own image parser though.
Personally in situations like this I prefer to use my own texture format that is already in the format I'm after ...
查看 D3DXCreateTextureFromFileEx：http://msdn。 microsoft.com/en-us/library/bb172802%28v=VS.85%29.aspx
否则，将您需要的数据部分加载到内存中，创建一个空纹理并锁定它并复制数据。
Look at D3DXCreateTextureFromFileEx: http://msdn.microsoft.com/en-us/library/bb172802%28v=VS.85%29.aspx
Otherwise, load the portion of the data you require yourself into memory, create an empty texture and lock it and copy the data.