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blur-effect: Use sigma value instead of blur radius

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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
This commit is contained in:
Jonas Dreßler 2020-02-10 15:34:57 +01:00 • committed by Georges Basile Stavracas Neto
parent d26bb38be9
commit f351cfa2f7
3 changed files with 43 additions and 44 deletions
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6
src/shell-blur-effect.h
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@ -42,9 +42,9 @@ G_DECLARE_FINAL_TYPE (ShellBlurEffect, shell_blur_effect, SHELL, BLUR_EFFECT, Cl
ShellBlurEffect *shell_blur_effect_new (void);
int shell_blur_effect_get_blur_radius (ShellBlurEffect *self);
void shell_blur_effect_set_blur_radius (ShellBlurEffect *self,
int radius);
int shell_blur_effect_get_sigma (ShellBlurEffect *self);
void shell_blur_effect_set_sigma (ShellBlurEffect *self,
int sigma);
float shell_blur_effect_get_brightness (ShellBlurEffect *self);
void shell_blur_effect_set_brightness (ShellBlurEffect *self,