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

From: <bugzilla@jessica.w3.org>
Date: Tue, 01 May 2012 23:01:30 +0000
To: public-css-bugzilla@w3.org
Message-Id: <E1SPM4Y-0005Sx-55@jessica.w3.org>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=16406

--- Comment #4 from Dirk Schulze <dschulze@adobe.com> 2012-05-01 23:01:29 UTC ---
Based on the comments on [1] so far I modified the text to:

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

              <p>
                UAs might just support two-dimensional transformations as a
subset of this
                specification. In this case <a
href="#three-d-transform-functions">three-dimensional
                transforms</a> and the properties 'transform-style',
                'perspective', 'perspective-origin' and 'backface-visibility'
must not be supported. 
                Section <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.
Section
                <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>).
              </p>

              <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">

              <div class="example">
                <p>
                  Authors can easily provide a fallback for UAs without 3D
support. The following
                  example has two property definitions for 'transform'. The
first one consists of
                  two two-dimensional transform functions. The second one has a
two-dimensional and
                  a three-dimensional transform function.
                </p>
                <pre>div {
    transform: scale(2) rotate(45deg);
    transform: scale(2) rotate3d(0, 0, 1, 45deg);
}</pre>

                <p>
                  For a UA with 3D support, the second definition will override
the first one. For
                  a UA without 3D support, the second definition is invalid and
it falls back to the
                  first definition.
                </p>
              </div>
""

[1] http://lists.w3.org/Archives/Public/public-fx/2012AprJun/0089.html

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Received on Tuesday, 1 May 2012 23:01:33 GMT

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