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use ardour canvas HSV instead of custom HSL.

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This commit is contained in:
Robin Gareus 2015-06-13 17:16:40 +02:00
parent b9d564ba43
commit 26b8be87cb
1 changed files with 4 additions and 22 deletions
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26
libs/canvas/wave_view.cc
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@ -363,23 +363,6 @@ struct ImageSet {
#ifndef NO_SPECTRUM
static float hue2rgb(const float p, const float q, float t) {
if (t < 0.f) t += 1.f;
if (t > 1.f) t -= 1.f;
if (t < 1.f/6.f) return p + (q - p) * 6.f * t;
if (t < 1.f/2.f) return q;
if (t < 2.f/3.f) return p + (q - p) * (2.f/3.f - t) * 6.f;
return p;
}
static void hsl2rgb(float c[3], const float hue, const float sat, const float lum) {
const float cq = lum < 0.5 ? lum * (1 + sat) : lum + sat - lum * sat;
const float cp = 2.f * lum - cq;
c[0] = hue2rgb (cp, cq, hue + 1.f/3.f);
c[1] = hue2rgb (cp, cq, hue);
c[2] = hue2rgb (cp, cq, hue - 1.f/3.f);
}
void
WaveView::draw_spectrum (Cairo::RefPtr<Cairo::ImageSurface>& image, int width, boost::shared_ptr<WaveViewThreadRequest> req) const
{
@ -418,12 +401,11 @@ WaveView::draw_spectrum (Cairo::RefPtr<Cairo::ImageSurface>& image, int width, b
if (level < -range) continue;
const float pk = level > 0.0 ? 1.0 : (range + level) / range;
float clr[3];
hsl2rgb (clr, .70 - .72 * pk, .9, .3 + pk * .4);
const double yy = i * ypb;
context->set_source_rgba (clr[0], clr[1], clr[2], .3 + pk * .2);
// center "0dB" peak around red, hue "0"
Color c = hsva_to_color (252 - 260 * pk, .9, .3 + pk * .4);
set_source_rgba (context, c);
context->rectangle (x0 - .5, yy - .5, x1 - x0, 1);
context->fill ();
}