local boxblur = require'boxblur'
Fast box blur algorithm for bgra8 and g8 pixel formats. The implementation is based on the moving-average technique, resulting in constant time for any blur radius, making it suitable for full-screen animated blurs.
Speed is 70 fps @ full HD per pass for the color variant, and 300 fps per pass for the grayscale variant, measured on a CPU with a single-threaded passmark score of around 2000.
API
boxblur.new(img, max_radius, [passes], [format]) -> blur |
create a blur object for a bitmap |
boxblur.new(w, h, format, max_radius, [passes]) -> blur |
create a blur object for painting on |
blur:blur([radius], [passes]) -> bmp |
blur img (returns a bitmap) |
blur:repaint() |
override with painting code |
blur:invalidate() |
tell blur that the source image changed |
A blur object holds all the temporary buffers necessary for blurring the same image multiple times using a different radius without allocating new memory each time. Each call to blur() returns a potentially different bitmap object which contains the blurred image.
Last updated:
4 years ago
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