src: fix shadowing warnings

Renames a few variables and parameters to avoid shadowing names.

Author: zbjornson

src/CanvasRenderingContext2d.cc

@@ -745,8 +745,8 @@ NAN_METHOD(Context2d::GetImageData) {
   Local<Int32> shHandle = Nan::New(sh);
   Local<Value> argv[argc] = { clampedArray, swHandle, shHandle };
 
-  Local<Function> constructor = Nan::GetFunction(Nan::New(ImageData::constructor)).ToLocalChecked();
-  Local<Object> instance = Nan::NewInstance(constructor, argc, argv).ToLocalChecked();
+  Local<Function> ctor = Nan::GetFunction(Nan::New(ImageData::constructor)).ToLocalChecked();
+  Local<Object> instance = Nan::NewInstance(ctor, argc, argv).ToLocalChecked();
 
   info.GetReturnValue().Set(instance);
 }

src/backend/Backend.cc

@@ -16,9 +16,9 @@ Backend::~Backend()
 }
 
 
-void Backend::setCanvas(Canvas* canvas)
+void Backend::setCanvas(Canvas* _canvas)
 {
-	this->canvas = canvas;
+	this->canvas = _canvas;
 }
 
 
@@ -53,19 +53,19 @@ int Backend::getWidth()
 {
 	return this->width;
 }
-void Backend::setWidth(int width)
+void Backend::setWidth(int width_)
 {
-	this->width = width;
+	this->width = width_;
 	this->recreateSurface();
 }
 
 int Backend::getHeight()
 {
 	return this->height;
 }
-void Backend::setHeight(int height)
+void Backend::setHeight(int height_)
 {
-	this->height = height;
+	this->height = height_;
 	this->recreateSurface();
 }
 

src/toBuffer.cc

@@ -9,7 +9,7 @@
  */
 
 cairo_status_t
-toBuffer(void *c, const uint8_t *data, unsigned len) {
+toBuffer(void *c, const uint8_t *odata, unsigned len) {
   closure_t *closure = (closure_t *) c;
 
   if (closure->len + len > closure->max_len) {
@@ -26,7 +26,7 @@ toBuffer(void *c, const uint8_t *data, unsigned len) {
     closure->max_len = max;
   }
 
-  memcpy(closure->data + closure->len, data, len);
+  memcpy(closure->data + closure->len, odata, len);
   closure->len += len;
 
   return CAIRO_STATUS_SUCCESS;