Re: How does Pipmak.getimage work?

[Christian W. <cwa...@gm...>]

> Am I correct in assuming that the decompressed image in RAM would be  
> the same filesize as a BMP version of the same image?

Probably. 4 bytes per pixel for an RGBA image, 3 bytes per pixel for  
an RGB image, plus maybe 100 bytes of header information per image.  
Pipmak keeps in memory the pixel data of all images that are in use as  
RGBA node backgrounds (for insideness testing) and hotspot maps, plus  
the last-used 20 MB worth of pixel data of currently unused images (to  
speed up loading of already visited nodes). Not all images that are  
currently being displayed are necessarily kept in memory (by Pipmak at  
least, your OpenGL driver may do it anyway), since they are displayed  
from video memory. Pixel data is loaded from disk whenever it is  
needed and not already in memory. In addition, the Lua-accessible  
image objects (whether their pixel data is in memory or not) are  
cached separately until Lua garbage-collects them.

  -Christian