//
// This file is licensed under the MIT X11 open source license.
// http://www.opensource.org/licenses/mit-license.php
//
// Authors: Aaron Bockover <abockover@novell.com>
//
// Copyright 2009 Novell, Inc.
//
var MtkColor = {
//
// Format Conversions
//
FromInt: function (value, is_argb) {
var c = value;
if (c <= 0xffffff) {
c = (c << 8) | 0xff;
is_argb = false;
} else if (c <= 0xfffffff) {
c = (c << 4) | 0xf;
is_argb = false;
}
return is_argb
? { a: (c >> 24) & 0xff,
r: (c >> 16) & 0xff,
g: (c >> 8) & 0xff,
b: (c >> 0) & 0xff }
: { r: (c >> 24) & 0xff,
g: (c >> 16) & 0xff,
b: (c >> 8) & 0xff,
a: (c >> 0) & 0xff };
},
ReadChannel: function (hi_c, lo_c) {
var hi = parseInt (hi_c, 16);
var lo = hi;
if (isNaN (hi) || hi < 0 || hi > 0xff) {
return Number.NaN;
}
if (lo_c) {
lo = parseInt (lo_c, 16);
if (isNaN (lo) || lo < 0 || lo > 0xff) {
return Number.NaN;
}
}
return (hi << 4) | lo;
},
FromString: function (str, is_argb) {
var err_color = { r: 0, g: 0, b: 0, a: 0xff };
if (typeof str != "string") {
return err_color;
}
if (str.charAt (0) == '#') {
switch (str.length) {
case 4: // #rgb
color = [
MtkColor.ReadChannel (str.charAt (1)),
MtkColor.ReadChannel (str.charAt (2)),
MtkColor.ReadChannel (str.charAt (3)),
0xff
];
break;
case 5: // #rgba
color = [
MtkColor.ReadChannel (str.charAt (1)),
MtkColor.ReadChannel (str.charAt (2)),
MtkColor.ReadChannel (str.charAt (3)),
MtkColor.ReadChannel (str.charAt (4))
];
break;
case 7: // #rrggbb
color = [
MtkColor.ReadChannel (str.charAt (1), str.charAt (2)),
MtkColor.ReadChannel (str.charAt (3), str.charAt (4)),
MtkColor.ReadChannel (str.charAt (5), str.charAt (6)),
0xff
];
break;
case 9: // #rrggbbaa
color = [
MtkColor.ReadChannel (str.charAt (1), str.charAt (2)),
MtkColor.ReadChannel (str.charAt (3), str.charAt (4)),
MtkColor.ReadChannel (str.charAt (5), str.charAt (6)),
MtkColor.ReadChannel (str.charAt (7), str.charAt (8))
];
break;
default:
return err_color;
}
} else if (str.length >= 10 && str.charAt (0) == 'r' &&
str.charAt (1) == 'g' && str.charAt (2) == 'b') {
var color = null;
var tok = "";
var channel = 0;
for (var i = 3; i < str.length; i++) {
var c = str.charAt (i);
if (!color) {
if (c == '(') {
color = [];
}
} else if (c == ',' || c == ')') {
color[channel++] = parseInt (tok);
tok = "";
if (c == ')') {
break;
}
} else if (c != ' ' && c != '\t') {
tok += c;
}
}
color.push (0xff);
is_argb = false;
}
for (var i = 0; i < 4; i++) {
if (isNaN (color[i])) {
return err_color;
}
}
return is_argb
? { r: color[1], g: color[2], b: color[3], a: color[0] }
: { r: color[0], g: color[1], b: color[2], a: color[3] };
},
ToString: function (color) {
if (typeof color == "number") {
color = MtkColor.FromInt (color);
} else if (!color || typeof color.r != "number" || typeof color.g != "number" ||
typeof color.b != "number") {
return "#000";
}
var c_a = typeof color.a != "number" ? 0xff : color.a;
var r = color.r.toString (16); if (r.length < 2) r = "0" + r;
var g = color.g.toString (16); if (g.length < 2) g = "0" + g;
var b = color.b.toString (16); if (b.length < 2) b = "0" + b;
var a = c_a.toString (16); if (a.length < 2) a = "0" + a;
if (r.charAt (0) == r.charAt (1) &&
g.charAt (0) == g.charAt (1) &&
b.charAt (0) == b.charAt (1) &&
a.charAt (0) == a.charAt (1)) {
r = r.charAt (0);
g = g.charAt (0);
b = b.charAt (0);
a = a.charAt (0);
}
var color = "#";
if (a != "ff" && a != "f") {
color += a;
}
color += r + g + b;
return color;
},
//
// Shading/Value Adjustment
//
SetOpacity: function (c, a) {
return { r: c.r, g: c.g, b: c.b, a: a };
},
Clamp: function (x, lo, hi) (x > hi) ? hi : (x < lo ? lo : x),
Mix: function (ca, cb, k) {
var alpha_a = typeof ca.alpha == "number" ? ca.a : 0xff;
var alpha_b = typeof cb.alpha == "number" ? cb.a : 0xff;
return {
r: MtkColor.Clamp (k * ca.r + (1.0 - k) * cb.r, 0, 0xff),
g: MtkColor.Clamp (k * ca.g + (1.0 - k) * cb.g, 0, 0xff),
b: MtkColor.Clamp (k * ca.b + (1.0 - k) * cb.b, 0, 0xff),
a: MtkColor.Clamp (k * ca.a + (1.0 - k) * cb.a, 0, 0xff),
};
},
Shade: function (color, k) {
if (k == 1.0) {
return color;
}
var alpha = (typeof color.a == "number") ? color.a : 0xff;
var hls = MtkColor.RgbToHls (color.r, color.g, color.b);
var rgb = MtkColor.HlsToRgb (hls[0], hls[1] * k, hls[2] * k);
return { r: rgb[0], g: rgb[1], b: rgb[2], a: alpha };
},
ShadeDelta: 0.05,
Lighter: function (color) MtkColor.Shade (color, 1 + MtkColor.ShadeDelta),
Darker: function (color) MtkColor.Shade (color, 1 - MtkColor.ShadeDelta),
RgbToHls: function (r, g, b) {
var min, max, delta;
var h = 0, l, s = 0;
if (r > g) {
max = r > b ? r : b;
min = g < b ? g : b;
} else {
max = g > b ? g : b;
min = r < b ? r : b;
}
l = (max + min) / 2;
if (max == min) {
return [h, l, s];
}
s = l <= 0.5
? (max - min) / (max + min)
: (max - min) / (2 - max - min);
delta = max - min;
if (r == max) h = (g - b) / delta;
else if (g == max) h = 2 + (b - r) / delta;
else if (b == max) h = 4 + (r - g) / delta;
if ((h *= 60) < 0.0) {
h += 360;
}
return [h, l, s];
},
HlsToRgb: function (h, l, s) {
var h_angle = [h + 120, h, h - 120];
var rgb = [l, l, l];
var m2 = l <= 0.5
? l * (1 + s)
: l + s - l * s;
var m1 = 2 * l - m2;
for (var i = 0; s != 0 && i < 3; i++) {
h = h_angle[i];
while (h > 360) h -= 360;
while (h < 0) h += 360;
if (h < 60) rgb[i] = m1 + (m2 - m1) * h / 60;
else if (h < 180) rgb[i] = m2;
else if (h < 240) rgb[i] = m1 + (m2 - m1) * (240 - h) / 60;
else rgb[i] = m1;
}
for (var i = 0; i < 3; i++) {
rgb[i] = MtkColor.Clamp (Math.round (rgb[i]), 0, 0xff);
}
return rgb;
}
};
) is private.
