From 230611991cf21a844e461178ddce133fa39f098f Mon Sep 17 00:00:00 2001
From: Tj Holowaychuk <tj@vision-media.ca>
Date: Thu, 30 Sep 2010 11:02:15 -0700
Subject: [PATCH 1/4] Added globalAlpha getter/setter

---
 src/context2d.cc | 22 ++++++++++++++++++++++
 src/context2d.h  |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/src/context2d.cc b/src/context2d.cc
index 52ec7b4..f82e9b6 100644
--- a/src/context2d.cc
+++ b/src/context2d.cc
@@ -100,6 +100,7 @@ Context2d::Initialize(Handle<Object> target) {
   NODE_SET_PROTOTYPE_METHOD(t, "arc", Arc);
   NODE_SET_PROTOTYPE_METHOD(t, "setFillRGBA", SetFillRGBA);
   NODE_SET_PROTOTYPE_METHOD(t, "setStrokeRGBA", SetStrokeRGBA);
+  proto->SetAccessor(String::NewSymbol("globalAlpha"), GetGlobalAlpha, SetGlobalAlpha);
   proto->SetAccessor(String::NewSymbol("miterLimit"), GetMiterLimit, SetMiterLimit);
   proto->SetAccessor(String::NewSymbol("lineWidth"), GetLineWidth, SetLineWidth);
   proto->SetAccessor(String::NewSymbol("lineCap"), GetLineCap, SetLineCap);
@@ -128,6 +129,7 @@ Context2d::Context2d(Canvas *canvas): ObjectWrap() {
   _canvas = canvas;
   _context = cairo_create(canvas->getSurface());
   cairo_set_line_width(_context, 1);
+  globalAlpha = NULL;
   RGBA(fill,0,0,0,1);
   RGBA(stroke,0,0,0,1);
 }
@@ -140,6 +142,26 @@ Context2d::~Context2d() {
   cairo_destroy(_context);
 }
 
+/*
+ * Get global alpha.
+ */
+
+Handle<Value>
+Context2d::GetGlobalAlpha(Local<String> prop, const AccessorInfo &info) {
+  Context2d *context = ObjectWrap::Unwrap<Context2d>(info.This());
+  return Number::New(context->globalAlpha);
+}
+
+/*
+ * Set global alpha.
+ */
+
+void
+Context2d::SetGlobalAlpha(Local<String> prop, Local<Value> val, const AccessorInfo &info) {
+  Context2d *context = ObjectWrap::Unwrap<Context2d>(info.This());
+  context->globalAlpha = val->NumberValue();
+}
+
 /*
  * Get miter limit.
  */
diff --git a/src/context2d.h b/src/context2d.h
index 7249a8f..b9c3695 100644
--- a/src/context2d.h
+++ b/src/context2d.h
@@ -18,6 +18,7 @@ class Context2d: public node::ObjectWrap {
   public:
     rgba_t fill;
     rgba_t stroke;
+    float globalAlpha;
     static void Initialize(Handle<Object> target);
     static Handle<Value> New(const Arguments &args);
     static Handle<Value> Save(const Arguments &args);
@@ -40,10 +41,12 @@ class Context2d: public node::ObjectWrap {
     static Handle<Value> ClearRect(const Arguments &args);
     static Handle<Value> Rect(const Arguments &args);
     static Handle<Value> Arc(const Arguments &args);
+    static Handle<Value> GetGlobalAlpha(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetMiterLimit(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetLineCap(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetLineJoin(Local<String> prop, const AccessorInfo &info);
     static Handle<Value> GetLineWidth(Local<String> prop, const AccessorInfo &info);
+    static void SetGlobalAlpha(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     static void SetMiterLimit(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     static void SetLineCap(Local<String> prop, Local<Value> val, const AccessorInfo &info);
     static void SetLineJoin(Local<String> prop, Local<Value> val, const AccessorInfo &info);

From e0bed743abe142e4b610f1476e3dfe46c1dfd903 Mon Sep 17 00:00:00 2001
From: Tj Holowaychuk <tj@vision-media.ca>
Date: Thu, 30 Sep 2010 11:05:06 -0700
Subject: [PATCH 2/4] Implemented globalAlpha

---
 src/context2d.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/context2d.cc b/src/context2d.cc
index f82e9b6..e2a2704 100644
--- a/src/context2d.cc
+++ b/src/context2d.cc
@@ -32,7 +32,7 @@ using namespace node;
     , C.r \
     , C.g \
     , C.b \
-    , C.a);
+    , context->globalAlpha == -1 ? C.a : context->globalAlpha);
 
 /*
  * Rectangle arg assertions.
@@ -129,7 +129,7 @@ Context2d::Context2d(Canvas *canvas): ObjectWrap() {
   _canvas = canvas;
   _context = cairo_create(canvas->getSurface());
   cairo_set_line_width(_context, 1);
-  globalAlpha = NULL;
+  globalAlpha = -1;
   RGBA(fill,0,0,0,1);
   RGBA(stroke,0,0,0,1);
 }

From 489700330f87d96136d20c6d755544078d2e0799 Mon Sep 17 00:00:00 2001
From: Tj Holowaychuk <tj@vision-media.ca>
Date: Thu, 30 Sep 2010 11:06:16 -0700
Subject: [PATCH 3/4] Added globalAlpha test

---
 test/canvas.test.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/test/canvas.test.js b/test/canvas.test.js
index a203a00..52266d4 100644
--- a/test/canvas.test.js
+++ b/test/canvas.test.js
@@ -339,5 +339,25 @@ module.exports = {
       , path
       , 'fc8bbf2cf6ae2d85fcf526103200e844'
       , 'Context2d#save() / resetore() failed');
+  },
+  
+  'test Context2d#globalAlpha=': function(assert){
+    var canvas = new Canvas(200, 200)
+      , ctx = canvas.getContext('2d')
+      , path = __dirname + '/images/globalAlpha.png';
+
+    ctx.fillRect(0,0,50,50);
+    ctx.translate(15,15);
+    ctx.globalAlpha = 0.6;
+    ctx.fillStyle = 'red';
+    ctx.fillRect(0,0,20,20);
+    ctx.fillStyle = 'yellow';
+    ctx.fillRect(0,0,10,10);
+    
+    assertChecksum(
+        canvas
+      , path
+      , 'd8365233f2beb420ba18ff78dc6d7405'
+      , 'Context2d#globalAlpha= failed');
   }
 }
\ No newline at end of file

From b8528640be4180a35bdf8d3003039a41548f43a6 Mon Sep 17 00:00:00 2001
From: Tj Holowaychuk <tj@vision-media.ca>
Date: Thu, 30 Sep 2010 11:08:23 -0700
Subject: [PATCH 4/4] Added globalAlpha getter assertion

---
 test/canvas.test.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/canvas.test.js b/test/canvas.test.js
index 52266d4..00cf731 100644
--- a/test/canvas.test.js
+++ b/test/canvas.test.js
@@ -349,6 +349,7 @@ module.exports = {
     ctx.fillRect(0,0,50,50);
     ctx.translate(15,15);
     ctx.globalAlpha = 0.6;
+    assert.equal(0.6, ctx.globalAlpha.toFixed(1));
     ctx.fillStyle = 'red';
     ctx.fillRect(0,0,20,20);
     ctx.fillStyle = 'yellow';