[Webkit-unassigned] [Bug 38953] New: CSSMatrix value attributes (m11-m44) should be transposed (?)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=38953

           Summary: CSSMatrix value attributes (m11-m44) should be
                    transposed (?)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bckenny at gmail.com


With Bug 38337 fixed, WebKitCSSMatrix is acting like a column-major matrix under multiplication. In that notation, the translation elements should be in the right-hand column, e.g. the x translation component would be in row 1, column 4 of the transformation matrix.

In recent nightlies (post http://trac.webkit.org/changeset/58584), the notation hasn't changed, still implying a row-major matrix:

var matrix = (new WebKitCSSMatrix()).translate(5);
matrix.m14; // 0
matrix.m41; // 5

The current 3D transform spec and WebKitCSSMatrix documentation give m<row><column>. The current preamble to TransformationMatrix.cpp makes this seem like a WON'T FIX issue -- that it just has to made clear that they are m<column><row> -- but maybe this is just an implementation note and not about exposing to Javascript.

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