X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fcanvas%2Futils.cc;h=2c8905b331a0233c97fc12836a07ae2dd7ad23e3;hb=22b07e0233a29d9633ffa825a79503befaf2e16e;hp=be509cdbe8172abd7f3dd83839148f7661a35754;hpb=b02ea3d435282d397e4f05d514b030352af6a36e;p=ardour.git diff --git a/libs/canvas/utils.cc b/libs/canvas/utils.cc index be509cdbe8..2c8905b331 100644 --- a/libs/canvas/utils.cc +++ b/libs/canvas/utils.cc @@ -21,127 +21,11 @@ #include #include #include -#include "canvas/utils.h" - -using std::max; -using std::min; - -void -ArdourCanvas::color_to_hsv (Color color, double& h, double& s, double& v) -{ - double r, g, b, a; - double cmax; - double cmin; - double delta; - - color_to_rgba (color, r, g, b, a); - - if (r > g) { - cmax = max (r, b); - } else { - cmax = max (g, b); - } - - if (r < g) { - cmin = min (r, b); - } else { - cmin = min (g, b); - } - - v = cmax; - - delta = cmax - cmin; - - if (cmax == 0) { - // r = g = b == 0 ... v is undefined, s = 0 - s = 0.0; - h = -1.0; - } - - if (delta != 0.0) { - if (cmax == r) { - h = fmod ((g - b)/delta, 6.0); - } else if (cmax == g) { - h = ((b - r)/delta) + 2; - } else { - h = ((r - g)/delta) + 4; - } - - h *= 60.0; - } - - if (delta == 0 || cmax == 0) { - s = 0; - } else { - s = delta / cmax; - } - -} - -ArdourCanvas::Color -ArdourCanvas::hsv_to_color (double h, double s, double v, double a) -{ - s = min (1.0, max (0.0, s)); - v = min (1.0, max (0.0, v)); - - if (s == 0) { - // achromatic (grey) - return rgba_to_color (v, v, v, a); - } - - h = min (360.0, max (0.0, h)); - - double c = v * s; - double x = c * (1.0 - fabs(fmod(h / 60.0, 2) - 1.0)); - double m = v - c; - if (h >= 0.0 && h < 60.0) { - return rgba_to_color (c + m, x + m, m, a); - } else if (h >= 60.0 && h < 120.0) { - return rgba_to_color (x + m, c + m, m, a); - } else if (h >= 120.0 && h < 180.0) { - return rgba_to_color (m, c + m, x + m, a); - } else if (h >= 180.0 && h < 240.0) { - return rgba_to_color (m, x + m, c + m, a); - } else if (h >= 240.0 && h < 300.0) { - return rgba_to_color (x + m, m, c + m, a); - } else if (h >= 300.0 && h < 360.0) { - return rgba_to_color (c + m, m, x + m, a); - } - return rgba_to_color (m, m, m, a); -} - -void -ArdourCanvas::color_to_rgba (Color color, double& r, double& g, double& b, double& a) -{ - r = ((color >> 24) & 0xff) / 255.0; - g = ((color >> 16) & 0xff) / 255.0; - b = ((color >> 8) & 0xff) / 255.0; - a = ((color >> 0) & 0xff) / 255.0; -} - -ArdourCanvas::Color -ArdourCanvas::rgba_to_color (double r, double g, double b, double a) -{ - /* clamp to [0 .. 1] range */ - - r = min (1.0, max (0.0, r)); - g = min (1.0, max (0.0, g)); - b = min (1.0, max (0.0, b)); - a = min (1.0, max (0.0, a)); - - /* convert to [0..255] range */ - - unsigned int rc, gc, bc, ac; - rc = rint (r * 255.0); - gc = rint (g * 255.0); - bc = rint (b * 255.0); - ac = rint (a * 255.0); - - /* build-an-integer */ +#include "canvas/utils.h" - return (rc << 24) | (gc << 16) | (bc << 8) | ac; -} +using namespace std; +using namespace ArdourCanvas; void ArdourCanvas::set_source_rgba (Cairo::RefPtr context, Color color) @@ -203,14 +87,14 @@ ArdourCanvas::distance_to_segment_squared (Duple const & p, Duple const & p1, Du at = p1; t = 0.0; return ((dp1x * dp1x) + (dp1y * dp1y)); - } + } // Project a line from p to the segment [p1,p2]. By considering the line // extending the segment, parameterized as p1 + (t * (p2 - p1)), - // we find projection of point p onto the line. + // we find projection of point p onto the line. // It falls where t = [(p - p1) . (p2 - p1)] / |p2 - p1|^2 - + t = ((dp1x * dx) + (dp1y * dy)) / segLenSquared; if (t < kEpsilon) { @@ -253,49 +137,3 @@ ArdourCanvas::distance_to_segment_squared (Duple const & p, Duple const & p1, Du return ((dpqx * dpqx) + (dpqy * dpqy)); } -// Inverse of sRGB "gamma" function. -static inline double -inv_gam_sRGB (double c) -{ - if (c <= 0.04045) { - return c/12.92; - } else { - return pow(((c+0.055)/(1.055)),2.4); - } -} - -// sRGB "gamma" function -static inline int -gam_sRGB(double v) -{ - if (v <= 0.0031308) { - v *= 12.92; - } else { - v = 1.055 * pow (v, 1.0 / 2.4) - 0.055; - } - return int (v*255+.5); -} - -static double -luminance (uint32_t c) -{ - // sRGB luminance(Y) values - const double rY = 0.212655; - const double gY = 0.715158; - const double bY = 0.072187; - - double r, g, b, a; - - ArdourCanvas::color_to_rgba (c, r, g, b, a); - - return (gam_sRGB (rY*inv_gam_sRGB(r) + gY*inv_gam_sRGB(g) + bY*inv_gam_sRGB(b))) / 255.0; -} - -uint32_t -ArdourCanvas::contrasting_text_color (uint32_t c) -{ - static const uint32_t white = ArdourCanvas::rgba_to_color (1.0, 1.0, 1.0, 1.0); - static const uint32_t black = ArdourCanvas::rgba_to_color (0.0, 0.0, 0.0, 1.0); - - return (luminance (c) < 0.50) ? white : black; -}