[cairo-bugs] [Bug 29521] Incorrect radial gradients when focus is outside of outermost circle

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Oct 12 13:15:03 PDT 2010


Andrea Canciani <ranma42 at gmail.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #10 from Andrea Canciani <ranma42 at gmail.com> 2010-10-12 13:15:00 PDT ---
This commit in pixman introduces the PDF radial gradients.
Most cairo backends now correctly use them, the other ones
will be fixed soon.

commit 1ca715ed1e6914e9bd9f050065e827d7a9e2efc9
Author: Andrea Canciani <ranma42 at gmail.com>
Date:   Sun Aug 15 09:07:33 2010 +0200

    Draw radial gradients with PDF semantics

    Change radial gradient computations and definition to reflect the
    radial gradients in PDF specifications (see section,
    Type 3 (Radial) Shadings of the PDF Reference Manual).

    Instead of having a valid interpolation parameter value for every
    point of the plane, define it only for points withing the area
    covered by the family of circles generated by interpolating or
    extrapolating the start and end circles.

    Points outside this area are now transparent black (rgba 0 0 0 0).
    Points within this area have the color assiciated with the maximum
    value of the interpolation parameter in that point (if multiple
    solutions exist within the range specified by the extend mode).

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