image sizes

the underminer · Post by **the underminer** » Fri May 19, 2006 4:13 am

I want some clarity here, people. In theory, luaplayer should be able to handle 512x512 images. I found out earlier that 512 width is not supported, but it now seems that the height can't be greater than 272 either.
I tried the windows version of luaplayer and it gave me an invalid image size error with this code: Image.createEmpty(64, 320). Can anyone tell me if this also occurs on the psp? And what are the actual restrictions? I'm not sure what resolutions are supported

Gary13579 · Post by **Gary13579** » Fri May 19, 2006 6:00 am

In the PSP LuaPlayer, it won't allow you to load an image over 512x512 pixels (the loadImage function in graphics.c checks and returns null if it didn't load, the Lua function then spits out an error on a debug screen).
I don't think I've ever tried an image bigger then 272 on LuaPlayer though...

Hmm... it would be interesting to make a LuaPlayer that uses OSLib as it's image functions. It should speed up many many programs and would support images bigger then 512x512.

Altair · Post by **Altair** » Sat May 20, 2006 7:31 am

How come nobody knows this and i keep telling everybody?

Lua can handle bigger images than 512x512. I myself use 1000x1000 images. There is one catch it has to be in JPG format. Also it shouldn't be to big a filesize (ok so two catches). The biggest i use is 58 kB. I haven't tested the limits, but maybe Shine can tell us?

be2003 · Post by **be2003** » Sat May 20, 2006 8:47 am

512x512 is the max for Image.createEmpty not Image.load and if your version is up to date it should be no issue...

Gary13579 · Post by **Gary13579** » Sat May 20, 2006 8:55 am

Image.load calls the C function loadImage, does it not? That then checks to see if the image is a PNG. If it is, it calls loadPngImage.
This code is right in graphics.cpp...

Code: Select all

	if &#40;width > 512 || height > 512&#41; &#123;
		free&#40;image&#41;;
		fclose&#40;fp&#41;;
		png_destroy_read_struct&#40;&png_ptr, png_infopp_NULL, png_infopp_NULL&#41;;
		return NULL;
	&#125;

the underminer · Post by **the underminer** » Sat May 20, 2006 4:47 pm

I used this really old windows version by lumo. I'll try some newer versions

the underminer · Post by **the underminer** » Sat May 20, 2006 4:57 pm

Yes!, it works with the 0.14 windows version I found on luaplayer.org

Shine · Post by **Shine** » Mon May 22, 2006 8:16 pm

Altair wrote:Lua can handle bigger images than 512x512. I myself use 1000x1000 images. There is one catch it has to be in JPG format. Also it shouldn't be to big a filesize (ok so two catches). The biggest i use is 58 kB. I haven't tested the limits, but maybe Shine can tell us?

Maybe this is possible, but then it is a bug, because it would lead to undefined results when trying to blit it. But it's already on my TODO list to hide all this hardware related stuff and allow images as big as you have memory.

Altair · Post by **Altair** » Tue May 23, 2006 6:23 am

Nope it works perfectly, no troubles with it what so ever!