This function does a slow pixel copy and should not be used intensively.
It can be used to prepare a complex static image from several others, but
if you need this kind of feature in real-time you'd better use
RenderTexture.
If sourceRect is empty, the whole image is copied. If applyAlpha is set
to true, the transparency of source pixels is applied. If it is false,
the pixels are copied unchanged with their alpha value.
Copy pixels from another image onto this one.
This function does a slow pixel copy and should not be used intensively. It can be used to prepare a complex static image from several others, but if you need this kind of feature in real-time you'd better use RenderTexture.
If sourceRect is empty, the whole image is copied. If applyAlpha is set to true, the transparency of source pixels is applied. If it is false, the pixels are copied unchanged with their alpha value.