bug 794038 pt 0.9 - provide an unscaledDevicePixelsPerCSSPixel attribute on nsIBaseWindow to expose the default device-pix/css-pix ratio. r=roc

2012-10-16 20:41:19 +01:00
parent 2cc6c5e41e
commit 80e3bb06d8
7 changed files with 63 additions and 2 deletions
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -4933,6 +4933,23 @@ nsDocShell::Destroy()
    return NS_OK;
 }

+NS_IMETHODIMP
+nsDocShell::GetUnscaledDevicePixelsPerCSSPixel(double *aScale)
+{
+    if (mParentWidget) {
+        *aScale = mParentWidget->GetDefaultScale();
+        return NS_OK;
+    }
+
+    nsCOMPtr<nsIBaseWindow> ownerWindow(do_QueryInterface(mTreeOwner));
+    if (ownerWindow) {
+        return ownerWindow->GetUnscaledDevicePixelsPerCSSPixel(aScale);
+    }
+
+    *aScale = 1.0;
+    return NS_OK;
+}
+
 NS_IMETHODIMP
 nsDocShell::SetPosition(int32_t x, int32_t y)
 {