void OSRWindow::Invalidate() {
if (!CefCurrentlyOn(TID_UI)) {
CefPostTask(TID_UI, base::Bind(&OSRWindow::Invalidate, this));
return;
}
// Don't post another task if the previous task is still pending.
if (render_task_pending_)
return;
render_task_pending_ = true;
// Render at 30fps.
static const int kRenderDelay = 1000 / 30;
CefPostDelayedTask(TID_UI, base::Bind(&OSRWindow::Render, this),
kRenderDelay);
}
void SetBrowserDpiSettings(CefRefPtr<CefBrowser> cefBrowser,
CefString autoZooming) {
// Setting zoom level immediately after browser was created
// won't work. We need to wait a moment before we can set it.
REQUIRE_UI_THREAD();
double oldZoomLevel = cefBrowser->GetHost()->GetZoomLevel();
double newZoomLevel = 0.0;
int dpix = 0;
int dpiy = 0;
GetSystemDpi(&dpix, &dpiy);
if (autoZooming.ToString() == "system_dpi") {
// Using only "dpix" value to calculate zoom level. All
// modern displays have equal horizontal/vertical resolution.
// Examples:
// dpix=96 zoom=0.0
// dpix=120 zoom=1.0
// dpix=144 zoom=2.0
// dpix=72 zoom=-1.0
newZoomLevel = (dpix - DEFAULT_DPIX) / 24;
} else {
// When atof() fails converting string to double, then
// 0.0 is returned.
newZoomLevel = atof(autoZooming.ToString().c_str());
}
if (oldZoomLevel != newZoomLevel) {
cefBrowser->GetHost()->SetZoomLevel(newZoomLevel);
if (cefBrowser->GetHost()->GetZoomLevel() != oldZoomLevel) {
// OK succes.
LOG_DEBUG << "Browser: SetBrowserDpiSettings: "
<< "DPI=" << dpix << " "
<< "zoom=" << cefBrowser->GetHost()->GetZoomLevel();
}
} else {
// This code block running can also be a result of executing
// SetZoomLevel(), as GetZoomLevel() didn't return the new
// value that was set. Documentation says that if SetZoomLevel
// is called on the UI thread, then GetZoomLevel should
// immediately return the same value that was set. Unfortunately
// this seems not to be true.
static bool already_logged = false;
if (!already_logged) {
already_logged = true;
// OK success.
LOG_DEBUG << "Browser: SetBrowserDpiSettings: "
<< "DPI=" << dpix << " "
<< "zoom=" << cefBrowser->GetHost()->GetZoomLevel();
}
}
// We need to check zooming constantly, during loading of pages.
// If we set zooming to 2.0 for localhost/ and then it navigates
// to google.com, then the zomming is back at 0.0 and needs to
// be set again.
CefPostDelayedTask(
TID_UI,
NewCefRunnableFunction(&SetBrowserDpiSettings, cefBrowser,
autoZooming),
50);
}
