2 Commits

Author	SHA1	Message	Date
Jonas Dreßler	f351cfa2f7	blur-effect: Use sigma value instead of blur radius ... Almost all implementations, including CSS [1] of gaussian blurs use the sigma/standard deviation value as the input parameter, even if they call that value "radius". Since using sigma is more correct mathematically and avoids confusion for people used to other blur implementations, use that parameter here, too. [1] https://www.w3.org/TR/filter-effects-1/#funcdef-filter-blur https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/991	2020-02-12 11:10:38 -03:00
Georges Basile Stavracas Neto	248eb7419e	Introduce ShellBlurEffect ... This is a moderately fast two-pass gaussian blur implementation. It downscales the framebuffer dynamically before applying the gaussian shader, which cuts down rendering time quite considerably. The blur shader takes 2 uniforms as input: the blur radius; and whether to blur vertically or horizontally. The blur radius is treated as an integer in C land to simplify calculations. The vertical parameter is treated as an integer by the shader simply due to Cogl not having proper boolean support in snippets. At last, brightness is also added to avoid needing to use an extra effect to achieve that. Brightness is applied in a different pipeline than blur, so we can control it more tightly. ShellBlurEffect also implements a "background" mode, where the contents beneath the actor are blurred, but not the actor itself. This mode is performance-heavy. Related: https://gitlab.gnome.org/GNOME/gnome-shell/issues/1848 https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/864	2020-01-08 15:59:15 -03:00