[cc] Initial checkin of cc-frame-viewer

tools/cc-frame-viewer/src/base/color.js

+/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+'use strict';
+
+base.exportTo('base', function() {
+  function Color(opt_r, opt_g, opt_b, opt_a) {
+    this.r = Math.floor(opt_r) || 0;
+    this.g = Math.floor(opt_g) || 0;
+    this.b = Math.floor(opt_b) || 0;
+    this.a = opt_a;
+  }
+
+  Color.fromString = function(str) {
+    var tmp;
+    var values;
+    if (str.substr(0, 4) == 'rgb(') {
+      tmp = str.substr(4, str.length - 5);
+      values = tmp.split(',').map(function(v) {
+        return v.replace(/^\s+/, '', 'g');
+      });
+      if (values.length != 3)
+        throw new Error('Malformatted rgb-expression');
+      return new Color(
+        parseInt(values[0]),
+        parseInt(values[1]),
+        parseInt(values[2]));
+    } else if (str.substr(0, 4) == 'rgba(') {
+      tmp = str.substr(5, str.length - 6);
+      values = tmp.split(',').map(function(v) {
+        return v.replace(/^\s+/, '', 'g');
+      });
+      if (values.length != 3)
+        throw new Error('Malformatted rgb-expression');
+      return new Color(
+        parseInt(values[0]),
+        parseInt(values[1]),
+        parseInt(values[2]),
+        parseFloat(values[3]));
+    } else if (str[0] == '#' && str.length == 7) {
+      return new Color(
+        parseInt(str.substr(1, 2), 16),
+        parseInt(str.substr(3, 2), 16),
+        parseInt(str.substr(5, 2), 16));
+    } else {
+      throw new Error('Unrecognized string format.');
+    }
+  };
+
+  Color.lerp = function(a, b, percent) {
+    if (a.a !== undefined && b.a !== undefined)
+      return Color.lerpRGBA(a, b, percent);
+    return Color.lerpRGB(a, b, percent);
+  }
+  Color.lerpRGB = function(a, b, percent) {
+    return new Color(
+      ((b.r - a.r) * percent) + a.r,
+      ((b.g - a.g) * percent) + a.g,
+      ((b.b - a.b) * percent) + a.b);
+  }
+
+  Color.lerpRGBA = function(a, b, percent) {
+    return new Color(
+      ((b.r - a.r) * percent) + a.r,
+      ((b.g - a.g) * percent) + a.g,
+      ((b.b - a.b) * percent) + a.b,
+      ((b.a - a.a) * percent) + a.a);
+  }
+
+  Color.prototype = {
+    brighten: function(opt_k) {
+      var k;
+      k = opt_k || 0.45;
+
+      return new Color(
+        Math.min(255, this.r + Math.floor(this.r * k)),
+        Math.min(255, this.g + Math.floor(this.g * k)),
+        Math.min(255, this.b + Math.floor(this.b * k)));
+    },
+
+    toString: function() {
+      if (this.a !== undefined) {
+        return 'rgba(' +
+            this.r + ',' + this.g + ',' +
+            this.b + ',' + this.a + ')';
+      }
+      return 'rgb(' + this.r + ',' + this.g + ',' + this.b + ')';
+    }
+  };
+
+  return {
+    Color: Color,
+  }
+});
+