Getting a higher quality image from QWebPage
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I'm creating an image capture utility to allow uses to download snapshots of the charts and graphs that our web application generates. I've used the "Framecapture":http://qt-project.org/doc/qt-5.0/qtwebkitexamples/webkitwidgets-framecapture.html example application as a starting point.
It works well, but the image quality is too low for our needs. I need to be able to created higher resolution images.
My understanding from reading the "QWebPage documentation":http://qt-project.org/doc/qt-5.1/qtwebkit/qwebpage.html#details is that I need to increase the pixel density ratio in the Viewports Attributes.
Unfortunately, I cannot figure out how to do that. Seems like I might need to do something with the X11 server that QWebPage talks to to get the Viewports Attributes, but I'm not a real expert in any of this stuff, so am having a hard time figuring it out.
Could somebody please give me some pointers?
The code that I'm using is basically like this:
@QWebPage m_page;
m_page.mainFrame()->load(url);
m_page.mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
m_page.mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
m_page.setViewportSize(1200,800);
QImage image(m_page.mainFrame()->contentsSize(), QImage::Format_ARGB32_Premultiplied);
image.fill(Qt::transparent);
QPainter painter(&image);
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setRenderHint(QPainter::TextAntialiasing, true);
painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
m_page.mainFrame()->documentElement().render(&painter);
painter.end();
image.save(fileName);@
