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[Bug 16406] Add section about just supporting the 2D part

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Date: Thu, 26 Apr 2012 04:31:59 +0000
To: public-css-bugzilla@w3.org
Message-Id: <E1SNGN5-0005ZM-Rb@jessica.w3.org>

--- Comment #1 from Dirk Schulze <dschulze@adobe.com> 2012-04-26 04:31:58 UTC ---
I suggest the following wording:

<h2 id="#two-dimensional-subset">Two Dimensional Subset</h2>

UAs might just support two-dimensional transformations as subset of this
specification. In this case <a
href="#three-d-transform-functions">three-dimensional transforms</a> must not
be supported. The properties 'transform-style', 'perspective',
'perspective-origin' and 'backface-visibility' don't contribute to the
rendering and must be ignored. The section about <a
href="#transform-3d-rendering">3D Transform Rendering</a> does not apply.
Matrix decomposing uses the technique taken from the "unmatrix" method in
"Graphics Gems II, edited by Jim Arvo", simplified for the 2D case. The section
about <a href="#mathematical-description">Mathematical Description of Transform
Functions</a> is still effective but can be reduced by using a 3x3
transformation matrix where <em>a</em> equals <em>m11</em>, <em>b</em> equals
<em>m12</em>, <em>c</em> equals <em>m21</em>, <em>d</em> equals <em>m22</em>,
<em>e</em> equals <em>m41</em> and <em>f</em> equals <em>m42</em> (see <a
href="#MatrixDefined">A 2D 3x2 matrix with six parameter</a>).

<img src="3x3matrix.png" alt="3x3 matrix" title="\begin{bmatrix} a & c & e \\ b
& d & f \\ 0 & 0 & 1 \end{bmatrix}" width="82" height="79">

Any thoughts?

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Received on Thursday, 26 April 2012 04:32:02 UTC

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