lowercase rgba_to_string res for hex

src/color.cc

@@ -242,7 +242,7 @@ rgba_create(uint32_t rgba) {
 void
 rgba_to_string(rgba_t rgba, char *buf) {
   if (1 == rgba.a) {
-    sprintf(buf, "#%.2X%.2X%.2X"
+    sprintf(buf, "#%.2x%.2x%.2x"
       , (int) (rgba.r * 255)
       , (int) (rgba.g * 255)
       , (int) (rgba.b * 255));

test/canvas.test.js

@@ -92,7 +92,10 @@ module.exports = {
       assert.equal('#80c880', ctx[prop], prop + ' rgba(128, 200, 128, 1) -> #80c880, got ' + ctx[prop]);
 
       ctx[prop] = 'rgba(128,80,0,0.5)';
-      assert.equal('rgba(128, 80, 0, 0.5)', ctx[prop], prop + ' rgba(128,80,0,0.5) -> rgba(128, 80, 0, 0.5), got ' + ctx[prop]);
+      assert.equal('rgba(128, 80, 0, 0.50)', ctx[prop], prop + ' rgba(128,80,0,0.5) -> rgba(128, 80, 0, 0.5), got ' + ctx[prop]);
+
+      ctx[prop] = 'rgba(128,80,0,0.75)';
+      assert.equal('rgba(128, 80, 0, 0.75)', ctx[prop], prop + ' rgba(128,80,0,0.75) -> rgba(128, 80, 0, 0.75), got ' + ctx[prop]);
 
       if ('shadowColor' == prop) return;