Hi, On Mon, 2008-09-29 at 12:10 +0200, Samuel wrote: > I have been at the GIMP IRC channel and they told me that C is faster > than Python if I want many pixel ops. I wrote a test plugin in Python > which copies a layer pixel per pixel to another one and it needs > several minutes for a vga picture. > I put it here: > http://pastebin.com/m1e61c74a What you are doing there is quite ineffecient. Your plug-in does not allocate a tile cache. And since you are reading a pixel from one tile, then writing a pixel to another tile, the tiles have to be re-requested from the core over and over again. There are several ways you can improve this: (1) Use a tile-cache with two tiles: gimp.tile_cache_ntiles(2). (2) Change your access pattern to iterate over the layer tile-by-tile instead of doing it row-by-row. If you want to keep row-by-row access, then you should increase your tile cache further so that it can hold 2 rows of tiles. (3) Instead of reading and writing single pixels, you could read and write arrays of pixels. For example rows of GIMP_TILE_WIDTH. This would reduce the overhead you have to do for each pixel. Sven _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
