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Draft: New "Wet" blend modes

Przemysław Gołąb (SirPigeonz) requested to merge pigeonz/krita:pigeonz/feature/wet-alpha-modes into master

I'm working on new type of blend modes that blend strokes Alpha channel with existing strokes nicely, but still allow layering of color channels. The main use case for those "Wet" modes is for creating smooth glazes using brush opacity. It can help with painting both digital style and for simulating behavior of some real life mediums in their yet undried state, like color markers, watercolor, or thick paints based on transparent mediums like oils or acrylics.

Video presentation: https://www.youtube.com/watch?v=ZkFKSoauyUU&list=PLBsW9BZAF-HzKARk-FoGGE83WRICALRdv

Comparison to Normal, Greater modes. image

Krita Artists post: https://krita-artists.org/t/wet-alpha-new-blending-mode/58272

Test Plan

To test it. Select a brush that uses opacity with sensor input, or lower Opacity setting of the brush. Then select blend modes with "Wet" at the beginning of the name. Main mode is "Wet Normal". Then paint few intersecting separate strokes and some strokes with different color on top.

Wet Parallel, Wet Multiply and others were made for testing purposes. They should probably be generated using templates, just like KoCompositeOpGeneric.h are.

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.

Reminder: the reviewer is responsible for merging the patch, this is to ensure at the least two people can build the patch. In case a patch breaks the build, both the author and the reviewer should be contacted to fix the build. If this is not possible, the commits shall be reverted, and a notification with the reasoning and any relevant logs shall be sent to the mailing list, kimageshop@kde.org.

Edited by Emmet O'Neill

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