Added path preservation support to Context2d::{stroke,fill}()

src/CanvasRenderingContext2d.cc

@@ -1144,9 +1144,15 @@ Context2d::Arc(const Arguments &args) {
 void
 Context2d::fill(bool preserve) {
   setSourceRGBA(state->fill);
-  hasShadow()
-    ? shadow(cairo_fill)
-    : cairo_fill(_context);
+  if (preserve) {
+    hasShadow()
+      ? shadow(cairo_fill_preserve)
+      : cairo_fill_preserve(_context);
+  } else {
+    hasShadow()
+      ? shadow(cairo_fill)
+      : cairo_fill(_context);
+  }
 }
 
 /*
@@ -1156,9 +1162,15 @@ Context2d::fill(bool preserve) {
 void
 Context2d::stroke(bool preserve) {
   setSourceRGBA(state->stroke);
-  hasShadow()
-    ? shadow(cairo_stroke)
-    : cairo_stroke(_context);
+  if (preserve) {
+    hasShadow()
+      ? shadow(cairo_stroke_preserve)
+      : cairo_stroke_preserve(_context);
+  } else {
+    hasShadow()
+      ? shadow(cairo_stroke)
+      : cairo_stroke(_context);
+  }
 }
 
 /*

test/public/tests.js

@@ -1012,3 +1012,20 @@ tests['shadowBlur stroke()'] = function(ctx){
   
   ctx.strokeRect(150,150,20,20);
 };
+
+tests['shadowBlur globalAlpha'] = function(ctx){
+  ctx.lineTo(0,0);
+  ctx.lineTo(50,0);
+  ctx.lineTo(50,150);
+  ctx.stroke();
+
+  ctx.lineWidth = 5;
+  ctx.globalAlpha = 0.3;
+  ctx.shadowColor = '#00c';
+  ctx.shadowBlur = 2;
+  ctx.shadowOffsetX = 8;
+  ctx.shadowOffsetY = 8;
+
+  ctx.lineTo(0,150);
+  ctx.stroke();
+};