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LibWeb: Add BorderRadiusCornerClipper

This is a helper class for clipping the corners off a element.

This works in a similar way to how (outline) borders are painted.

The steps are:
  1. A small bitmap that fits only the corners is allocated
  2. The corners are painted into the bitmap
  3. The existing pixels (where the corners will be painted)
     are copied using the (inverse) corner bitmap as a mask
     (done before the element is painted)
  4. The element is painted
  5. The areas outside the corner radii are restored

Like with the borders, this only requires allocation on the first
paint.
This commit is contained in:
MacDue 2022-06-15 21:15:29 +01:00 committed by Linus Groh
parent 4dfbbd5965
commit 830632407f
3 changed files with 155 additions and 0 deletions

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@ -289,6 +289,7 @@ set(SOURCES
Page/Page.cpp
Painting/BackgroundPainting.cpp
Painting/BorderPainting.cpp
Painting/BorderRadiusCornerClipper.cpp
Painting/ButtonPaintable.cpp
Painting/CanvasPaintable.cpp
Painting/CheckBoxPaintable.cpp