void
APZCCallbackHelper::UpdateSubFrame(nsIContent* aContent,
FrameMetrics& aMetrics)
{
// Precondition checks
MOZ_ASSERT(aContent);
if (aMetrics.mScrollId == FrameMetrics::NULL_SCROLL_ID) {
return;
}
nsCOMPtr<nsIDOMWindowUtils> utils = GetDOMWindowUtils(aContent);
if (!utils) {
return;
}
// We currently do not support zooming arbitrary subframes. They can only
// be scrolled, so here we only have to set the scroll position and displayport.
nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.mScrollId);
CSSPoint actualScrollOffset = ScrollFrameTo(sf, aMetrics.mScrollOffset);
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aContent);
if (element) {
MaybeAlignAndClampDisplayPort(aMetrics, actualScrollOffset);
utils->SetDisplayPortForElement(aMetrics.mDisplayPort.x,
aMetrics.mDisplayPort.y,
aMetrics.mDisplayPort.width,
aMetrics.mDisplayPort.height,
element);
}
aMetrics.mScrollOffset = actualScrollOffset;
}
already_AddRefed<nsIDOMWindowUtils>
APZCCallbackHelper::GetDOMWindowUtils(const nsIContent* aContent)
{
nsCOMPtr<nsIDOMWindowUtils> utils;
nsIDocument* doc = aContent->GetCurrentDoc();
if (doc) {
utils = GetDOMWindowUtils(doc);
}
return utils.forget();
}
bool
APZCCallbackHelper::GetScrollIdentifiers(const nsIContent* aContent,
uint32_t* aPresShellIdOut,
FrameMetrics::ViewID* aViewIdOut)
{
if (!aContent || !nsLayoutUtils::FindIDFor(aContent, aViewIdOut)) {
return false;
}
nsCOMPtr<nsIDOMWindowUtils> utils = GetDOMWindowUtils(aContent);
return utils && (utils->GetPresShellId(aPresShellIdOut) == NS_OK);
}
void
APZCCallbackHelper::UpdateSubFrame(nsIContent* aContent,
FrameMetrics& aMetrics)
{
// Precondition checks
MOZ_ASSERT(aContent);
MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());
if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
return;
}
nsCOMPtr<nsIDOMWindowUtils> utils = GetDOMWindowUtils(aContent);
if (!utils) {
return;
}
// We currently do not support zooming arbitrary subframes. They can only
// be scrolled, so here we only have to set the scroll position and displayport.
nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.GetScrollId());
bool scrollUpdated = false;
CSSPoint actualScrollOffset = ScrollFrameTo(sf, aMetrics.GetScrollOffset(), scrollUpdated);
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aContent);
if (element) {
if (scrollUpdated) {
AdjustDisplayPortForScrollDelta(aMetrics, actualScrollOffset);
} else {
RecenterDisplayPort(aMetrics);
}
gfx::IntSize alignment = gfxPrefs::LayersTilesEnabled()
? gfx::IntSize(gfxPrefs::LayersTileWidth(), gfxPrefs::LayersTileHeight()) :
gfx::IntSize(0, 0);
LayerMargin margins = aMetrics.GetDisplayPortMargins();
utils->SetDisplayPortMarginsForElement(margins.left,
margins.top,
margins.right,
margins.bottom,
alignment.width,
alignment.height,
element, 0);
CSSRect baseCSS = aMetrics.CalculateCompositedRectInCssPixels();
nsRect base(baseCSS.x * nsPresContext::AppUnitsPerCSSPixel(),
baseCSS.y * nsPresContext::AppUnitsPerCSSPixel(),
baseCSS.width * nsPresContext::AppUnitsPerCSSPixel(),
baseCSS.height * nsPresContext::AppUnitsPerCSSPixel());
nsLayoutUtils::SetDisplayPortBaseIfNotSet(aContent, base);
}
aMetrics.SetScrollOffset(actualScrollOffset);
}
void
APZCCallbackHelper::UpdateSubFrame(nsIContent* aContent,
FrameMetrics& aMetrics)
{
// Precondition checks
MOZ_ASSERT(aContent);
MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());
// We don't currently support zooming for subframes, so nothing extra
// needs to be done beyond the tasks common to this and UpdateRootFrame.
ScrollFrame(aContent, aMetrics);
if (nsCOMPtr<nsIDOMWindowUtils> utils = GetDOMWindowUtils(aContent)) {
SetDisplayPortMargins(utils, aContent, aMetrics);
}
}
void
APZCCallbackHandler::RequestContentRepaint(const FrameMetrics& aFrameMetrics)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aFrameMetrics.GetScrollId() != FrameMetrics::NULL_SCROLL_ID);
if (aFrameMetrics.GetIsRoot()) {
nsIDOMWindowUtils* utils = GetDOMWindowUtils();
if (utils && APZCCallbackHelper::HasValidPresShellId(utils, aFrameMetrics)) {
FrameMetrics metrics = aFrameMetrics;
APZCCallbackHelper::UpdateRootFrame(utils, metrics);
}
} else {
// aFrameMetrics.mIsRoot is false, so we are trying to update a subframe.
// This requires special handling.
nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(aFrameMetrics.GetScrollId());
if (content) {
FrameMetrics newSubFrameMetrics(aFrameMetrics);
APZCCallbackHelper::UpdateSubFrame(content, newSubFrameMetrics);
}
}
}
