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| author | Mustafa Quraish <mustafaq9@gmail.com> | 2021-09-02 17:50:06 -0400 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2021-09-03 01:51:05 +0200 |
| commit | 882d57326c39a0268587c75009a45ffeeb14b36f (patch) | |
| tree | 602132a05cc03a5c14fd61956302c0dd5904b7ae /Userland/Libraries | |
| parent | ca6c9be94cd1e62467803c108aba81fa98e9bf97 (diff) | |
| download | serenity-882d57326c39a0268587c75009a45ffeeb14b36f.zip | |
LibGfx/Color: Use luminosity to compute grayscale value
Issue #9758 discusses this.
Diffstat (limited to 'Userland/Libraries')
| -rw-r--r-- | Userland/Libraries/LibGfx/Color.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Userland/Libraries/LibGfx/Color.h b/Userland/Libraries/LibGfx/Color.h index ab459e6284..ba9d52feec 100644 --- a/Userland/Libraries/LibGfx/Color.h +++ b/Userland/Libraries/LibGfx/Color.h @@ -221,9 +221,14 @@ public: alpha() * other.alpha() / 255); } + constexpr u8 luminosity() const + { + return (red() * 0.2126f + green() * 0.7152f + blue() * 0.0722f); + } + constexpr Color to_grayscale() const { - int gray = (red() + green() + blue()) / 3; + auto gray = luminosity(); return Color(gray, gray, gray, alpha()); } |