hex8 and hex4 support and formatting about tinycolor HOT 4 OPEN

Thanks for the info. This will be a little tricky, since IE filters use the backwards hex8 format. But I think we can special case that in the toFilter function. I doubt that too many people are using hex8 right now (it was added mainly to support toFilter), so the risk of changing the semantics is probably not too big.

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If you'd like to contribute these changes, I'd be happy to accept a patch. Here's what would need to be done:

1. modify rgbaToHex to flip where transparency shows up:

   TinyColor/tinycolor.js

   Line 510 in 8cc9ee6

   function rgbaToHex(r, g, b, a) {

   .
2. Add an 'allow4Char' parameter to that function that behaves just like 'allow3Char' does here:

   TinyColor/tinycolor.js

   Line 500 in 8cc9ee6

   if (allow3Char && hex[0].charAt(0) == hex[0].charAt(1) && hex[1].charAt(0) == hex[1].charAt(1) && hex[2].charAt(0) == hex[2].charAt(1)) {

   .
3. Add the 'allow4Char' parameter to toHex8() and toHex8String(). We could consider renaming it to toHexAlpha or something.
4. Add some tests for these features:

   TinyColor/test/test.js

   Line 156 in 8cc9ee6

   equal (tinycolor("rgba 255 0 0 0.5").toHex8String(), "#80ff0000");

   .
5. We also should move the current logic in rgbaToHex into the toFilter function, since it's important the semantics stay the same for this.

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Does anyone know how to code this (I do not code myself!).

Cin cin

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This is closed by #136

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