diff options
Diffstat (limited to 'dgl/src/Color.cpp')
| -rw-r--r-- | dgl/src/Color.cpp | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/dgl/src/Color.cpp b/dgl/src/Color.cpp index 2ea9819f..4965c902 100644 --- a/dgl/src/Color.cpp +++ b/dgl/src/Color.cpp @@ -16,7 +16,9 @@ #include "../Color.hpp" +#if !defined(HAVE_DCAIRO) #include "nanovg/nanovg.h" +#endif START_NAMESPACE_DGL @@ -105,7 +107,36 @@ Color::Color(const Color& color1, const Color& color2, float u) noexcept Color Color::fromHSL(float hue, float saturation, float lightness, float alpha) { +#if defined(HAVE_DGL) return nvgHSLA(hue, saturation, lightness, static_cast<uchar>(getFixedRange(alpha)*255.0f)); +#else + float m1, m2; + Color col; + hue = fmodf(hue, 1.0f); + if (hue < 0.0f) hue += 1.0f; + fixRange(saturation); + fixRange(lightness); + m2 = lightness <= 0.5f ? (lightness * (1 + saturation)) : (lightness + saturation - lightness * saturation); + m1 = 2 * lightness - m2; + auto hue_ = [](float h, float m1, float m2) -> float + { + if (h < 0) h += 1; + if (h > 1) h -= 1; + if (h < 1.0f/6.0f) + return m1 + (m2 - m1) * h * 6.0f; + else if (h < 3.0f/6.0f) + return m2; + else if (h < 4.0f/6.0f) + return m1 + (m2 - m1) * (2.0f/3.0f - h) * 6.0f; + return m1; + }; + col.red = hue_(hue + 1.0f/3.0f, m1, m2); + col.green = hue_(hue, m1, m2); + col.blue = hue_(hue - 1.0f/3.0f, m1, m2); + col.alpha = alpha; + col.fixBounds(); + return col; +#endif } Color Color::fromHTML(const char* rgb, float alpha) @@ -224,6 +255,7 @@ void Color::fixBounds() noexcept // ----------------------------------------------------------------------- +#if !defined(HAVE_DCAIRO) Color::Color(const NVGcolor& c) noexcept : red(c.r), green(c.g), blue(c.b), alpha(c.a) { @@ -239,6 +271,7 @@ Color::operator NVGcolor() const noexcept nc.a = alpha; return nc; } +#endif // ----------------------------------------------------------------------- |