gui, feat: set background color to white.

Author: xicilion

fibjs/src/gui/cef/CefWebView.cpp

@@ -144,6 +144,8 @@ void CefWebView::open()
     gui_handler->browser_list_.push_back(this);
 
     CefBrowserSettings browser_settings;
+    browser_settings.background_color = CefColorSetARGB(255, 255, 255, 255);
+
     if (use_view) {
         static CefRefPtr<GuiBrowserViewDelegate> view_delegate;
         if (view_delegate == NULL)

test/cef_test.js

@@ -238,6 +238,7 @@ describe("cef", () => {
             var ret = win.dev.Page.captureScreenshot();
             try {
                 var img = gd.load(encoding.base64.decode(ret.data));
+                assert.equal(img.getPixel(1, 1), gd.rgb(255, 255, 255));
                 done();
             } catch (e) {
                 done(e);