Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/apps/camera/bower_components/font-fit/font-fit.js

@@ -0,0 +1,132 @@
+;(function(define){define(function(require,exports,module){
+'use strict';
+
+/**
+ * Simple logger.
+ *
+ * @return {Function}
+ */
+var debug = 0 ? console.log.bind(console) : function(){};
+
+/**
+ * Global canvas cache.
+ *
+ * @type {Object}
+ */
+var cache = {};
+
+/**
+ * Default min/max font-size.
+ *
+ * @type {Number}
+ */
+var MIN = 16;
+var MAX = 24;
+
+/**
+ * The number of pixels to subtract from
+ * the given `config.space` to ensure
+ * HTML text doesn't overflow container.
+ *
+ * Ideally we would use 1px, but in some
+ * cases italicised text in canvas is ~2px
+ * longer than the same text in HTML.
+ *
+ * http://bugzil.la/1126391
+ *
+ * @type {Number}
+ */
+var BUFFER = 3;
+
+/**
+ * Get the font-size that closest fits
+ * the given space with the given font.
+ *
+ * Config:
+ *
+ *   - {String} `text` The text string
+ *   - {String} `font` Font shorthand string
+ *   - {Number} `space` Width (px) to fit the text into
+ *   - {Number} `min` Min font-size (px) (optional)
+ *   - {Number} `max` Max font-size (px) (optional)
+ *
+ * @param  {Object} config
+ * @return {Object} {fontSize,overflowing,textWidth}
+ */
+module.exports = function(config) {
+  debug('font fit', config);
+  var space = config.space - BUFFER;
+  var min = config.min || MIN;
+  var max = config.max || MAX;
+  var text = trim(config.text);
+  var fontSize = max;
+  var textWidth;
+  var font;
+
+  do {
+    font = config.font.replace(/\d+px/, fontSize + 'px');
+    textWidth = getTextWidth(text, font);
+  } while (textWidth > space && fontSize !== min && fontSize--);
+
+  return {
+    textWidth: textWidth,
+    fontSize: fontSize,
+    overflowing: textWidth > space
+  };
+};
+
+/**
+ * Get the width of the given text
+ * with the given font style.
+ *
+ * @param  {String} text
+ * @param  {String} font (CSS shorthand)
+ * @return {Number} (px)
+ */
+function getTextWidth(text, font) {
+  var ctx = getCanvasContext(font);
+  var width = ctx.measureText(text).width;
+  debug('got text width', width);
+  return width;
+}
+
+/**
+ * Get a canvas context configured
+ * to the given font style.
+ *
+ * @param  {String} font
+ * @return {CanvasRenderingContext2D}
+ */
+function getCanvasContext(font) {
+  debug('get canvas context', font);
+
+  var cached = cache[font];
+  if (cached) { return cached; }
+
+  var canvas = document.createElement('canvas');
+  canvas.setAttribute('moz-opaque', 'true');
+  canvas.setAttribute('width', '1px');
+  canvas.setAttribute('height', '1px');
+  debug('created canvas', canvas);
+
+  var ctx = canvas.getContext('2d', { willReadFrequently: true });
+  ctx.font = font;
+
+  return cache[font] = ctx;
+}
+
+/**
+ * Trim leading, trailing
+ * and excess whitespace.
+ *
+ * @param  {String} text
+ * @return {String}
+ */
+function trim(text) {
+  return text.replace(/\s+/g, ' ').trim();
+}
+
+});})(typeof define=='function'&&define.amd?define
+:(function(n,w){'use strict';return typeof module=='object'?function(c){
+c(require,exports,module);}:function(c){var m={exports:{}};c(function(n){
+return w[n];},m.exports,m);w[n]=m.exports;};})('font-fit',this));