Re: [Tuxmath-devel] Prerendered PNG cache for SVG sprites

[Tim H. <ho...@wu...>]

Hi Wenyuan,

That's great! I really look forward to checking it out, when I return to more 
convenient internet access in late June. (This was written from 2.4km 
elevation.)

Best,
--Tim


On Wednesday, June 09, 2010 02:19:19 am Wenyuan Guo wrote:
> Hi all,
> 
> I have updated our Git repository, master branch with an improved version
> of SVG sprite loader. It caches prerendered PNG versions of SVG sprites on
> harddisk, and I'm happy to report that it greatly improves the initial
> loading time as well as delay in switching between fullscreen and windowed
> mode in-game! No new cache files will be generated as long as the user
> doesn't change the resolution of his/her desktop. Please try it out if you
> have time!
> 
> The modification is entirely transparent to other parts of the program and
> the function signatures and usages are completely unchanged.
> 
> One difficulty I had was I had intended to use BMP files as cache, since
> SDL has native "save" functions into that format. But it turns out that
> SDL's saveBMP doesn't support alpha transparency, causing scrambled
> sprites. After a good amount of googling, to my surprise, tuxpaint has a
> function to save SDL surfaces into PNG format! So in my implementation I
> have "borrowed" that function (after modifying it a bit to support alpha
> channel) and
> everything's fine :D! Maybe that part can eventually to be factored out in
> the common?
> 
> Cheers
> Wenyuan