CE-Programming
Missing Clipping Variant of gfx_RotatedTransparentSprite_NoClip
There is no clipping variant for the function gfx_RotatedTransparentSprite_NoClip. I tried alternatives but they all failed, so maybe there could be a function like gfx_RotatedTransparentSprite, like how there is gfx_Rectangle for gfx_Rectangle_NoClip.
This is really hard and would be really slow sadly enough. The main suggestion is to use gfx_RotateSprite and then use gfx_TransparentSprite to display the clipped version for now. We will consider this function, but not many people are writing optimized assembly these days.
I have recently implemented a clipping version of
gfx_Rotated(Transparent)Sprite_NoClip, which runs at the same speed as the un-clipped routine plus a constant overhead of ~100 clock cycles.
The main thing we are debating now is determining how to deal with the cut corners of the square sprite-texture. Currently, all the sprite rotations routines cut the corners. It would be possible to fix this so the entire square is rendered which would require the rendering area to be twice as large, meaning it would run at half the speed in the worst case.
Another consideration is that gfx_Rotated(Transparent)Sprite_NoClip would be required to cut corners by default for API compatibility reasons. Otherwise the additional uncut pixels could potentially be written off-screen in older programs.
For the return value, I suppose returning the unclipped size would be fine.
One way to prevent corners from being cutoff is to pass in a larger sprite with extra padding.