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LibGfx: Use gamma-corrected interpolation for color gradients

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Switch over to gamma-aware interpolation. This causes color gradients
to not look so dark in the middle. SIMD optimized code is provided for
sse1 enabled builds.

Fixes #1342.
This commit is contained in:
Sahan Fernando 2020-11-17 02:35:41 +11:00 • committed by Andreas Kling
parent 7042490e41
commit 1b9a85e4f1
3 changed files with 165 additions and 21 deletions
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8
Libraries/LibGfx/Color.h
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@ -89,10 +89,10 @@ public:
static constexpr Color from_rgb(unsigned rgb) { return Color(rgb | 0xff000000); }
static constexpr Color from_rgba(unsigned rgba) { return Color(rgba); }
u8 red() const { return (m_value >> 16) & 0xff; }
u8 green() const { return (m_value >> 8) & 0xff; }
u8 blue() const { return m_value & 0xff; }
u8 alpha() const { return (m_value >> 24) & 0xff; }
constexpr u8 red() const { return (m_value >> 16) & 0xff; }
constexpr u8 green() const { return (m_value >> 8) & 0xff; }
constexpr u8 blue() const { return m_value & 0xff; }
constexpr u8 alpha() const { return (m_value >> 24) & 0xff; }
void set_alpha(u8 value)
{