#1: I think so, the libpng source seem to support it. But you could also use a different (loss less) format for the palette conversion (gif, bmp), and then convert it back to rgb(a) afterwards. irfanview could possible do most of the work (with some plugins).
#2: Yes I will add support for textures in LDCad, biggest issue for me with that is how to keep the 'normal' rendering at the current speed.
Thinking about libpng, you could probably make a relatively easy c++ program using libpng to convert a png to one using the nearest LDraw colors without having to use all kinds of tools.
#2: Yes I will add support for textures in LDCad, biggest issue for me with that is how to keep the 'normal' rendering at the current speed.
Thinking about libpng, you could probably make a relatively easy c++ program using libpng to convert a png to one using the nearest LDraw colors without having to use all kinds of tools.