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Re: [css-background] "background-repeat:round;" and aspect ratio

From: fantasai <fantasai.lists@inkedblade.net>
Date: Mon, 19 Jul 2010 12:46:48 -0700
Message-ID: <4C44ABA8.7040700@inkedblade.net>
To: Brian Manthos <brianman@microsoft.com>
CC: "www-style@w3.org" <www-style@w3.org>
On 07/16/2010 11:39 AM, Brian Manthos wrote:
> Assume (for simplicity):
> 1. Image referenced via background-image has intrinsic width, height(, aspect ratio)
> 2. Element upon which the style is applied is larger than the image in both dimensions, and larger than 10px by 20px
>
> Scenarios:
> a. background-repeat:round  repeat; background-size: auto auto;
> b. background-repeat:repeat round ; background-size: auto auto;

These two will preserve aspect ratio, because there is a constraint
on one dimension but not on the other.

> c. background-repeat:round  round ; background-size: auto auto;

This will not preserve aspect ratio.

> d. background-repeat:round  repeat; background-size: 10px auto;

This will preserve aspect ratio because there is only a constraint
on the horizontal dimension, not the vertical one.

> e. background-repeat:repeat round ; background-size: 10px auto;
> f. background-repeat:round  round ; background-size: 10px auto;
> g. background-repeat:round  repeat; background-size: auto 20px;

These will not preserve aspect ratio because there are constraints
on both dimensions.

> h. background-repeat:repeat round ; background-size: auto 20px;

This will preserve aspect ratio because there are no constraints
on the horizontal dimension.

> i. background-repeat:round  round ; background-size: auto 20px;
> j. background-repeat:round  repeat; background-size: 10px 20px;
> k. background-repeat:repeat round ; background-size: 10px 20px;
> l. background-repeat:round  round ; background-size: 10px 20px;

These will not preserve aspect ratio because there are constraints
on both dimensions.

> Which of those preserves the image's intrinsic aspect ratio?

See above.

> Which of those preserves a 1:2 aspect ratio?

None, afaict, unless the image's own aspect ratio is 1:2.

> Which of those ignores aspect ratio when applying round (dimensions
> are "rounded" independently after a pre-rounded size is computed)?

jkl ignore the images aspect ratio. The others try to respect it,
but will not preserve it exactly.

~fantasai
Received on Monday, 19 July 2010 19:47:24 GMT

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