Check browser support on SpinViewer

[jongmoon]

Description

It's difficult to check if spinviewer is available. It's better to give a chance to check available. for example firing exception.

[jongmoon]

1. Need feature detection for background-size style.

• for example, Android 4.3 does not support background-size.
  

2. IE version must be larger than 8

[jongmoon]

Feature Tested

• Galaxy S2 2.3.6, Default Browser
  • background-size feature: true
  • working: true
    • But It needs es5-shim files to makes axes work!

<script src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.1.5/es5-shim.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.1.5/es5-sham.js"></script>

• Galaxy S3 4.0.4 , Default Browser
  • true
  • true
• Galaxy S4 4.2.2 , Default Browser
  • true
  • true
• Windows 7, IE8
  • false
  • false
• Galaxy S6 5.0.2, Default Browser
  • Mozilla/5.0 (Linux;Android 5.0.2;SAMSUNG SM-G920S Build/LRX22G) AppleWebkit/537.36(KHTML, like Gecko) SamsungBrowser/3.0 Chrome/38.0.2125.102 Mobile Safari/537.36
  • true
  • true
• Galaxy A8 5.1.1, Default Browser (4.0)
  • 
  • true
  • true
• Galaxy S6 Edge 5.0.2, Default Browser <-- Issue
  • Mozilla/5.0 (Linux;Android 5.0.2;SAMSUNG SM-G925S Build/LRX22G) AppleWebkit/537.36(KHTML, like Gecko) SamsungBrowser/3.0 Chrome/38.0.2125.102 Mobile Safari/537.36
  • true
  • false <-- not working

[jongmoon]

It's related with pixel of jpeg image on Galaxy S6 Edge (Default Browser 3.0).

To tell the conclusion first,

• If image is jpeg
• and image pixel is more than 3.7 megapixels (3,686,760)

Samsung Browser 3 (on S6 Edge - SM-G925S) cannot calculate size of image.

I tested following cases.

• 640 x 15360 (X) - it was first image that I found odd action.
• 630 x 15120 (X) - resize above original image
• 500 x 12000 (x)
• 400 x 9600 (x)
• 320 x 7680 (o)
• 333 x 8000 (o)
• 375 x 9000 (o)
• 388 x 9300 (o)
• 394 x 9450 (x)
• 391 x 9375 (x)
• 393 × 9425 (x)
• 392 × 9412 (x)
• 392 × 9406 (x)
• 392 × 9403 (o)
• 392 × 9404 (o)
• 392 × 9405 (o) <-- Max size that works OK
• 15360 × 640 (x) <-- rotate 90',
• 1280 × 7680 (x) <-- width * 2, height / 2
• 780 × 4680 (o) <-- resize above. it works OK
• 785 × 4710 (x)
• 640 x 15360 (o) PNG converted

[jongmoon]

I think it is not proper to limit that browser because it can be used other case on that browser.

So let's make documentation for this issue.

[jongmoon]

Guide for this

• https://github.com/naver/egjs-view360/wiki/Browser-Coverage-and-Exception-Handling