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Bug 564815 - Implement window.devicePixelRatio [r=jst, sr=sicking]

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--HG--
extra : rebase_source : 392c6636fabe2a3ec519abd03ef1b1cf44ba464e
This commit is contained in:
Matt Brubeck 2012-08-22 13:17:26 -07:00
parent 1be60a7fb4
commit dd28aab718
3 changed files with 25 additions and 12 deletions
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14
dom/base/nsDOMWindowUtils.cpp
View File

@ -1439,17 +1439,9 @@ nsDOMWindowUtils::FindElementWithViewId(nsViewID aID,
NS_IMETHODIMP
nsDOMWindowUtils::GetScreenPixelsPerCSSPixel(float* aScreenPixels)
{
*aScreenPixels = 1;
if (!nsContentUtils::IsCallerTrustedForRead())
return NS_ERROR_DOM_SECURITY_ERR;
nsPresContext* presContext = GetPresContext();
if (!presContext)
return NS_OK;
*aScreenPixels = float(nsPresContext::AppUnitsPerCSSPixel())/
presContext->AppUnitsPerDevPixel();
return NS_OK;
nsCOMPtr<nsPIDOMWindow> window = do_QueryReferent(mWindow);
NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
return window->GetDevicePixelRatio(aScreenPixels);
}
NS_IMETHODIMP

20
dom/base/nsGlobalWindow.cpp
View File

@ -3866,6 +3866,26 @@ nsGlobalWindow::GetMozInnerScreenY(float* aScreenY)
return NS_OK;
}
NS_IMETHODIMP
nsGlobalWindow::GetDevicePixelRatio(float* aRatio)
{
FORWARD_TO_OUTER(GetDevicePixelRatio, (aRatio), NS_ERROR_NOT_INITIALIZED);
*aRatio = 1.0;
if (!mDocShell)
return NS_OK;
nsCOMPtr<nsPresContext> presContext;
mDocShell->GetPresContext(getter_AddRefs(presContext));
if (!presContext)
return NS_OK;
*aRatio = float(nsPresContext::AppUnitsPerCSSPixel())/
presContext->AppUnitsPerDevPixel();
return NS_OK;
}
NS_IMETHODIMP
nsGlobalWindow::GetMozPaintCount(uint64_t* aResult)
{

3
dom/interfaces/base/nsIDOMWindow.idl
View File

@ -32,7 +32,7 @@ interface nsIDOMMozURLProperty : nsISupports
* @see <http://www.whatwg.org/html/#window>
*/
[scriptable, uuid(A1AF6CD9-C6E7-4037-99F8-DBCA1B03E345)]
[scriptable, uuid(afeb6529-06f1-47e8-98c6-c7bfadb4c1ff)]
interface nsIDOMWindow : nsISupports
{
// the current browsing context
@ -375,6 +375,7 @@ interface nsIDOMWindow : nsISupports
readonly attribute float mozInnerScreenX;
readonly attribute float mozInnerScreenY;
readonly attribute float devicePixelRatio;
/* The maximum offset that the window can be scrolled to
(i.e., the document width/height minus the scrollport width/height) */