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SVG: Make QGradients use ComponentInterpolation

Sharaf Zaman requested to merge szaman/krita:fix-svg-pre-multiplied into master

QGradient uses pre-multiplied colors to compute gradient which isn't correct as per the SVG specifications. This patch uses an Internal Method to switch to simple component interpolation.

Test Plan

I've added two new test cases.

Formalities Checklist

  • I confirmed this builds.
  • I confirmed Krita ran and the relevant functions work.
  • I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!)
  • I made sure my commits build individually and have good descriptions as per KDE guidelines.
  • I made sure my code conforms to the standards set in the HACKING file.
  • I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.

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