improve image resizing logic

[GoogleCodeExporter]

Right now, SpriteMe has some cool logic that automatically resizes
repeating images to promote spriting. For example, if you have two repeat-x
bg images, one with width 2 and another with width 5, SpriteMe will combine
those in a sprite with width 10. To do this, it makes the first bg image 5
times wider, and the second image 2 times wider.

The challenge is, what if there are images with width 2, 4, 5, 7, 10, and
16. It's probably best to create a sprite 20px wide, and just leave out the
7 and 16 images. This type of logic needs to be added. 

Original issue reported on code.google.com by stevesou...@gmail.com on 1 Sep 2009 at 5:38

[GoogleCodeExporter]

what about cropping the sprite to the size of the biggest image? that way you 
would
generate a 21px wide image [ Math.ceil(16/7)*7 ] and then crop it to 16px wide. 
I
think it should be the easiest/best solution..

Original comment by millerme...@gmail.com on 17 Sep 2009 at 6:27

[GoogleCodeExporter]

These are repeating images - so you can't crop them.

Original comment by stevesou...@gmail.com on 17 Sep 2009 at 6:52

[GoogleCodeExporter]

I wasn't thinking about images that can't be "stretched" since every time that 
I use
background-repeat is for images that can be stretched (like a gradient 
background..)

I think the kind of logic that you're trying to achieve (combining all sizes 
into the
same file) is impossible, because of prime numbers, and it can drastically 
increase
the file size...

Using your example (and keeping the same logic) I would recommend creating 3 
sprites
[2,5,10], [4,16] and [7]. - avoiding to repeat the 10px image and limiting the 
image
repeat to 5x.. since if you use the 20px wide you would have 10 2px images..

If the repeated image could be stretched (gradient background) the number of 
times
you repeat it shouldn't make a big differences in the file-size but if it's an 
icon
it will.

Original comment by millerme...@gmail.com on 17 Sep 2009 at 9:21

[GoogleCodeExporter]

We're not able to make any assumptions about the images. It's not just icons - 
Ive
created bg images that repeated but weren't stretchable (for example, 
spriteme.org.).

Original comment by stevesou...@gmail.com on 17 Sep 2009 at 10:05