Function interpolateGradient

src/gui/SpectrumWidget.cpp:753–762

Interpolate a normalized value t (0–1) through the given gradient stops.

// Interpolate a normalized value t (0–1) through the given gradient stops.
static QRgb interpolateGradient(float t, const WfGradientStop* stops, int n)
{
    int i = 0;
    while (i < n - 2 && stops[i + 1].pos < t) ++i;
    const float seg = (t - stops[i].pos) / (stops[i + 1].pos - stops[i].pos);
    const int r = static_cast<int>(stops[i].r + seg * (stops[i + 1].r - stops[i].r));
    const int g = static_cast<int>(stops[i].g + seg * (stops[i + 1].g - stops[i].g));
    const int b = static_cast<int>(stops[i].b + seg * (stops[i + 1].b - stops[i].b));
    return qRgb(qBound(0, r, 255), qBound(0, g, 255), qBound(0, b, 255));
}

#ifdef AETHER_GPU_SPECTRUM
static bool qtSoftwareOpenGlRequested()