Skia Graphics

Discussion in 'NZ Computing' started by Lawrence D'Oliveiro, Oct 14, 2010.

  1. Another company that Google acquired in order to open-source its code
    <http://code.google.com/p/skia/>.

    “Skia†was the code name for Apple’s old QuickDraw GX project from the early
    1990s. And there was a Mike Reed involved with that as well. Coincidence?

    Other similarities, from a quick look over the docs
    <http://skia.googlecode.com/svn/trunk/docs/html/index.html>:
    * 3x3 matrices with perspective distortions. Even the option to use “fixedâ€
    and “fract†instead of floating-point (I suppose embedded applications don’t
    necessarily have floating-point hardware universally available—yet).
    * SkDescriptor looks just like the old “collections†from the GX Printing
    Manager.
    * SkPaint looks like a combination of (parts of) the old gxInk and gxStyle
    objects.

    Differences:
    * Not really a retained-mode API, by the looks of things.
    * No support for non-RGB colour spaces like XYZ, YUV and CMYK.
    * They’ve added support for gradients.
    * Blur filtering. But SVG supports more filter types than this.
    * Not sure if the pixel operations are the same: Skia offers the usual
    Porter-Duff operators, while GX had a much more intricate system.
    * Paths can have both quadratic (as in GX) and cubic Bézier segments.
    * Low-level access to scan-line conversion, by the looks of things:
    SkBlitter, SkScan.
     
    Lawrence D'Oliveiro, Oct 14, 2010
    #1
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