[Webkit-unassigned] [Bug 143748] New: textPath layout performance improvement (Part 2)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143748

            Bug ID: 143748
           Summary: textPath layout performance improvement (Part 2)
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: zimmermann at kde.org

We could improve textPath layout performance by supporting a new path traversing mode. The new mode should take a vector of lengths and should return a vector of arrow vectors (position and normal angle). The input vector of lengths represents the distance from the beginning of the path to each character should be displayed. The output vector of arrow vectors represents the physical character display points and angles (which are needed for rotating the characters).

This will require changing SVGTextLayoutEngine to calculate the lengths of the characters on the path first and then passing all of them to the path traversal function. Instead of traversing the path for every length, we are going to get the required point and angle from the vector of arrow vectors.

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