Color[] An array that contains a copy of the requested pixel colors, represented by Color structs.
Retrieves a copy of the the pixel color data. The colors are represented by Color structs.
When you call this function, Unity converts the data to a float color representation.
A single call to this function is usually faster than multiple calls to GetPixel, especially for large textures. If a lower-precision representation is acceptable, GetPixels32 is faster and uses less memory because it does not perform integer-to-float conversions.
The returned array is a flattened 2D array, where the data appears row by row: the pixels are laid out left to right, bottom to top. The dimensions of the array are width * height of the texture.
获取像素颜色块。
该函数是上面的 GetPixels 的扩展版本；它不返回
整个 Mip 级别，而只返回从 x,y 开始的 blockWidth x blockHeight 区域。
该块受所使用的 Mipmap 级别的大小限制（必须引用 Mipmap 中的像素块）。返回数组的大小为 blockWidth*blockHeight。
注意：对于基于深度数据的 WebCamTexture 实例，此方法通过 Color.r 属性来返回深度值的数组。另请参阅：WebCamTexture.isDepth。