From 6ecdcec101af9aa56afee69da99eb1686ee67dfb Mon Sep 17 00:00:00 2001
From: Tj Holowaychuk <tj@vision-media.ca>
Date: Thu, 30 Sep 2010 13:27:33 -0700
Subject: [PATCH] Added Gradient#AddColorStopRGBA()

---
 src/canvas.h     | 18 ++++++++++++++++++
 src/context2d.cc | 22 ++--------------------
 src/gradient.cc  | 16 ++++++++++++++--
 src/gradient.h   |  4 +++-
 4 files changed, 37 insertions(+), 23 deletions(-)

diff --git a/src/canvas.h b/src/canvas.h
index 104080e..f359be5 100644
--- a/src/canvas.h
+++ b/src/canvas.h
@@ -13,6 +13,24 @@
 #include <node_object_wrap.h>
 #include <cairo.h>
 
+/*
+ * RGBA arg assertions.
+ */
+
+#define RGBA_ARGS(N) \
+  if (!args[N]->IsNumber()) \
+    return ThrowException(Exception::TypeError(String::New("r required"))); \
+  if (!args[N+1]->IsNumber()) \
+    return ThrowException(Exception::TypeError(String::New("g required"))); \
+  if (!args[N+2]->IsNumber()) \
+    return ThrowException(Exception::TypeError(String::New("b required"))); \
+  if (!args[N+3]->IsNumber()) \
+    return ThrowException(Exception::TypeError(String::New("alpha required"))); \
+  float r = args[N]->Int32Value(); \
+  float g = args[N+1]->Int32Value(); \
+  float b = args[N+2]->Int32Value(); \
+  float a = args[N+3]->NumberValue();
+
 using namespace v8;
 
 class Canvas: public node::ObjectWrap {
diff --git a/src/context2d.cc b/src/context2d.cc
index c318918..45b0bb0 100644
--- a/src/context2d.cc
+++ b/src/context2d.cc
@@ -48,24 +48,6 @@ using namespace node;
   int width = args[2]->Int32Value(); \
   int height = args[3]->Int32Value();
 
-/*
- * RGBA arg assertions.
- */
-
-#define RGBA_ARGS \
-  if (!args[0]->IsNumber()) \
-    return ThrowException(Exception::TypeError(String::New("r required"))); \
-  if (!args[1]->IsNumber()) \
-    return ThrowException(Exception::TypeError(String::New("g required"))); \
-  if (!args[2]->IsNumber()) \
-    return ThrowException(Exception::TypeError(String::New("b required"))); \
-  if (!args[3]->IsNumber()) \
-    return ThrowException(Exception::TypeError(String::New("alpha required"))); \
-  float r = args[0]->Int32Value(); \
-  float g = args[1]->Int32Value(); \
-  float b = args[2]->Int32Value(); \
-  float a = args[3]->NumberValue();
-
 /*
  * Initialize Context2d.
  */
@@ -344,7 +326,7 @@ Context2d::SetLineCap(Local<String> prop, Local<Value> val, const AccessorInfo &
 Handle<Value>
 Context2d::SetFillRGBA(const Arguments &args) {
   HandleScope scope;
-  RGBA_ARGS;
+  RGBA_ARGS(0);
   Context2d *context = ObjectWrap::Unwrap<Context2d>(args.This());
   RGBA(context->fill,r,g,b,a);
   return Undefined();
@@ -357,7 +339,7 @@ Context2d::SetFillRGBA(const Arguments &args) {
 Handle<Value>
 Context2d::SetStrokeRGBA(const Arguments &args) {
   HandleScope scope;
-  RGBA_ARGS;
+  RGBA_ARGS(0);
   Context2d *context = ObjectWrap::Unwrap<Context2d>(args.This());
   RGBA(context->stroke,r,g,b,a);
   return Undefined();
diff --git a/src/gradient.cc b/src/gradient.cc
index a2cff54..645f73e 100644
--- a/src/gradient.cc
+++ b/src/gradient.cc
@@ -15,6 +15,7 @@ Gradient::Initialize(Handle<Object> target) {
   t->InstanceTemplate()->SetInternalFieldCount(1);
   t->SetClassName(String::NewSymbol("CanvasGradient"));
 
+  NODE_SET_PROTOTYPE_METHOD(t, "addColorStopRGBA", AddColorStopRGBA);
   target->Set(String::NewSymbol("CanvasGradient"), t->GetFunction());
 }
 
@@ -49,12 +50,23 @@ Gradient::New(const Arguments &args) {
   return ThrowException(Exception::TypeError(String::New("invalid arguments")));
 }
 
+Handle<Value>
+Gradient::AddColorStopRGBA(const Arguments &args) {
+  HandleScope scope;
+  if (!args[0]->IsNumber()) \
+    return ThrowException(Exception::TypeError(String::New("offset required"))); \
+  RGBA_ARGS(1);
+  Gradient *grad = ObjectWrap::Unwrap<Gradient>(args.This());
+  cairo_pattern_add_color_stop_rgba(grad->getPattern(), args[0]->NumberValue(), r, g, b, a);
+  return Undefined();
+}
+
 Gradient::Gradient(double x0, double y0, double x1, double y1):
   _x0(x0), _y0(y0), _x1(x1), _y1(y1) {
-  _grad = cairo_pattern_create_linear(x0, y0, x1, y1);
+  _pattern = cairo_pattern_create_linear(x0, y0, x1, y1);
 }
 
 Gradient::Gradient(double x0, double y0, double r0, double x1, double y1, double r1):
   _x0(x0), _y0(y0), _x1(x1), _y1(y1), _r0(r0), _r1(r1) {
-  _grad = cairo_pattern_create_radial(x0, y0, r0, x1, y1, r1);
+  _pattern = cairo_pattern_create_radial(x0, y0, r0, x1, y1, r1);
 }
diff --git a/src/gradient.h b/src/gradient.h
index 8a79015..097d779 100644
--- a/src/gradient.h
+++ b/src/gradient.h
@@ -16,12 +16,14 @@ class Gradient: public node::ObjectWrap {
   public:
     static void Initialize(Handle<Object> target);
     static Handle<Value> New(const Arguments &args);
+    static Handle<Value> AddColorStopRGBA(const Arguments &args);
     Gradient(double x0, double y0, double x1, double y1);
     Gradient(double x0, double y0, double r0, double x1, double y1, double r1);
+    inline cairo_pattern_t *getPattern(){ return _pattern; }
 
   private:
     double _x0, _y0, _x1, _y1, _r0, _r1;
-    cairo_pattern_t *_grad;
+    cairo_pattern_t *_pattern;
 };
 
 #endif
\ No newline at end of file