Fixed font size growing issue after successive calls. Closes #70

lib/context2d.js

@@ -68,14 +68,34 @@ var parseFont = exports.parseFont = function(str){
   // Invalid
   if (!captures) return;
 
+  // Cached
+  if (cache[str]) return cache[str];
+
   // Populate font object
   font.weight = captures[1] || 'normal';
   font.style = captures[2] || 'normal';
   font.size = parseFloat(captures[3]);
   font.unit = captures[4];
   font.family = captures[5];
+  
+  // TODO: dpi
+  // TODO: remaining unit conversion
+  switch (font.unit) {
+    case 'pt':
+      font.size /= .75;
+      break;
+    case 'in':
+      font.size *= 96;
+      break;
+    case 'mm':
+      font.size *= 96.0 / 25.4;
+      break;
+    case 'cm':
+      font.size *= 96.0 / 2.54;
+      break;
+  }
 
-  return font;
+  return cache[str] = font;
 };
 
 /**
@@ -186,30 +206,8 @@ Context2d.prototype.__defineGetter__('strokeStyle', function(){
 Context2d.prototype.__defineSetter__('font', function(val){
   if ('string' == typeof val) {
     var font;
-    if (font = cache[val] || parseFont(val)) {
+    if (font = parseFont(val)) {
       this.lastFontString = val;
-
-      // TODO: dpi
-      // TODO: remaining unit conversion
-      switch (font.unit) {
-        case 'pt':
-          font.size /= .75;
-          break;
-        case 'in':
-          font.size *= 96;
-          break;
-        case 'mm':
-          font.size *= 96.0 / 25.4;
-          break;
-        case 'cm':
-          font.size *= 96.0 / 2.54;
-          break;
-      }
-
-      // Cache font object
-      cache[val] = font;
-
-      // Set font
       this.setFont(
           font.weight
         , font.style

test/canvas.test.js

@@ -23,13 +23,13 @@ module.exports = {
         '20px Arial'
       , { size: 20, unit: 'px', family: 'Arial' }
       , '20pt Arial'
-      , { size: 20, unit: 'pt', family: 'Arial' }
+      , { size: 26.666666666666668, unit: 'pt', family: 'Arial' }
       , '20.5pt Arial'
-      , { size: 20.5, unit: 'pt', family: 'Arial' }
+      , { size: 27.333333333333332, unit: 'pt', family: 'Arial' }
       , '20% Arial'
       , { size: 20, unit: '%', family: 'Arial' }
       , '20mm Arial'
-      , { size: 20, unit: 'mm', family: 'Arial' }
+      , { size: 75.59055118110237, unit: 'mm', family: 'Arial' }
       , '20px serif'
       , { size: 20, unit: 'px', family: 'serif' }
       , '20px sans-serif'