From 17731169e9f1714f1d49af52f5fc4597cb789cb4 Mon Sep 17 00:00:00 2001
From: Niklas von Hertzen <niklasvh@gmail.com>
Date: Sat, 1 Feb 2014 20:03:23 +0200
Subject: [PATCH] Add support for single text-shadow

---
 src/nodecontainer.js    | 22 ++++++++++++++++++++++
 src/nodeparser.js       |  8 ++++++++
 src/renderers/canvas.js | 20 ++++++++++++++++++++
 tests/test.js           |  3 ++-
 4 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/nodecontainer.js b/src/nodecontainer.js
index d428048..529a862 100644
--- a/src/nodecontainer.js
+++ b/src/nodecontainer.js
@@ -216,6 +216,28 @@ NodeContainer.prototype.parseBackgroundRepeat = function(index) {
     return this.cssList("backgroundRepeat", index)[0];
 };
 
+NodeContainer.prototype.parseTextShadows = function() {
+    var textShadow = this.css("textShadow");
+    var results = [];
+
+    if (textShadow && textShadow !== 'none') {
+        var shadows = textShadow.match(this.TEXT_SHADOW_PROPERTY);
+        for (var i = 0; shadows && (i < shadows.length); i++) {
+            var s = shadows[i].match(this.TEXT_SHADOW_VALUES);
+            results.push({
+                color: s[0],
+                offsetX: s[1] ? s[1].replace('px', '') : 0,
+                offsetY: s[2] ? s[2].replace('px', '') : 0,
+                blur: s[3] ? s[3].replace('px', '') : 0
+            });
+        }
+    }
+    return results;
+};
+
+NodeContainer.prototype.TEXT_SHADOW_PROPERTY = /((rgba|rgb)\([^\)]+\)(\s-?\d+px){0,})/g;
+NodeContainer.prototype.TEXT_SHADOW_VALUES = /(-?\d+px)|(#.+)|(rgb\(.+\))|(rgba\(.+\))/g;
+
 function isPercentage(value) {
     return value.toString().indexOf("%") !== -1;
 }
diff --git a/src/nodeparser.js b/src/nodeparser.js
index 00a2732..8446e74 100644
--- a/src/nodeparser.js
+++ b/src/nodeparser.js
@@ -192,7 +192,15 @@ NodeParser.prototype.paintText = function(container) {
     var weight = container.parent.fontWeight();
     var size = container.parent.css('fontSize');
     var family = container.parent.css('fontFamily');
+    var shadows = container.parent.parseTextShadows();
+
     this.renderer.font(container.parent.css('color'), container.parent.css('fontStyle'), container.parent.css('fontVariant'), weight, size, family);
+    if (shadows.length) {
+        // TODO: support multiple text shadows
+        this.renderer.fontShadow(shadows[0].color, shadows[0].offsetX, shadows[0].offsetY, shadows[0].blur);
+    } else {
+        this.renderer.clearShadow();
+    }
 
     textList.map(this.parseTextBounds(container), this).forEach(function(bounds, index) {
         if (bounds) {
diff --git a/src/renderers/canvas.js b/src/renderers/canvas.js
index b7d1f52..dd13c23 100644
--- a/src/renderers/canvas.js
+++ b/src/renderers/canvas.js
@@ -5,6 +5,7 @@ function CanvasRenderer(width, height) {
     this.canvas.height = height;
     this.ctx = this.canvas.getContext("2d");
     this.ctx.textBaseline = "bottom";
+    this.variables = {};
     log("Initialized CanvasRenderer");
 }
 
@@ -48,10 +49,29 @@ CanvasRenderer.prototype.font = function(color, style, variant, weight, size, fa
     this.setFillStyle(color).font = [style, variant, weight, size, family].join(" ");
 };
 
+CanvasRenderer.prototype.fontShadow = function(color, offsetX, offsetY, blur) {
+    this.setVariable("shadowColor", color)
+        .setVariable("shadowOffsetY", offsetX)
+        .setVariable("shadowOffsetX", offsetY)
+        .setVariable("shadowBlur", blur);
+};
+
+CanvasRenderer.prototype.clearShadow = function() {
+    this.setVariable("shadowColor", "rgba(0,0,0,0)");
+};
+
 CanvasRenderer.prototype.setOpacity = function(opacity) {
     this.ctx.globalAlpha = opacity;
 };
 
+CanvasRenderer.prototype.setVariable = function(property, value) {
+    if (this.variables[property] !== value) {
+        this.variables[property] = this.ctx[property] = value;
+    }
+
+    return this;
+};
+
 CanvasRenderer.prototype.text = function(text, left, bottom) {
     this.ctx.fillText(text, left, bottom);
 };
diff --git a/tests/test.js b/tests/test.js
index 34fd3ca..8d52de6 100644
--- a/tests/test.js
+++ b/tests/test.js
@@ -11,7 +11,8 @@ var h2cSelector, h2cOptions;
 
     document.write(srcStart + '/tests/assets/jquery-1.6.2.js' + scrEnd);
     document.write(srcStart + '/tests/assets/jquery.plugin.html2canvas.js' + scrEnd);
-    var html2canvas = ['log', 'nodecontainer', 'stackingcontext', 'textcontainer', 'support', 'imagecontainer', 'imageloader', 'nodeparser', 'core', 'renderer', 'promise', 'renderers/canvas'], i;
+    var html2canvas = ['log', 'nodecontainer', 'stackingcontext', 'textcontainer', 'support', 'imagecontainer',
+        'imageloader', 'nodeparser', 'font', 'fontmetrics', 'core', 'renderer', 'promise', 'renderers/canvas'], i;
     for (i = 0; i < html2canvas.length; ++i) {
         document.write(srcStart + '/src/' + html2canvas[i] + '.js?' + Math.random() + scrEnd);
     }