void CheckerboardEvent::LogInfo(RendertraceProperty aProperty,
const TimeStamp& aTimestamp,
const CSSRect& aRect,
const std::string& aExtraInfo,
const MonitorAutoLock& aProofOfLock) {
MOZ_ASSERT(mRecordTrace);
if (mRendertraceInfo.tellp() >= LOG_LENGTH_LIMIT) {
// The log is already long enough, don't put more things into it. We'll
// append a truncation message when this event ends.
return;
}
// The log is consumed by the page at
// http://people.mozilla.org/~kgupta/rendertrace.html and will move to
// about:checkerboard in bug 1238042. The format is not formally specced, but
// an informal description can be found at
// https://github.com/staktrace/rendertrace/blob/master/index.html#L30
mRendertraceInfo << "RENDERTRACE "
<< (aTimestamp - mOriginTime).ToMilliseconds() << " rect "
<< sColors[aProperty] << " " << aRect.X() << " " << aRect.Y()
<< " " << aRect.Width() << " " << aRect.Height() << " "
<< "// " << sDescriptions[aProperty] << aExtraInfo
<< std::endl;
}
CSSRect CalculateRectToZoomTo(const RefPtr<dom::Document>& aRootContentDocument,
const CSSPoint& aPoint) {
// Ensure the layout information we get is up-to-date.
aRootContentDocument->FlushPendingNotifications(FlushType::Layout);
// An empty rect as return value is interpreted as "zoom out".
const CSSRect zoomOut;
nsCOMPtr<nsIPresShell> shell = aRootContentDocument->GetShell();
if (!shell) {
return zoomOut;
}
nsIScrollableFrame* rootScrollFrame = shell->GetRootScrollFrameAsScrollable();
if (!rootScrollFrame) {
return zoomOut;
}
nsCOMPtr<dom::Element> element = ElementFromPoint(shell, aPoint);
if (!element) {
return zoomOut;
}
while (element && !ShouldZoomToElement(element)) {
element = element->GetParentElement();
}
if (!element) {
return zoomOut;
}
FrameMetrics metrics =
nsLayoutUtils::CalculateBasicFrameMetrics(rootScrollFrame);
CSSRect compositedArea(
CSSPoint::FromAppUnits(shell->GetVisualViewportOffset()),
metrics.CalculateCompositedSizeInCssPixels());
const CSSCoord margin = 15;
CSSRect rect =
nsLayoutUtils::GetBoundingContentRect(element, rootScrollFrame);
// If the element is taller than the visible area of the page scale
// the height of the |rect| so that it has the same aspect ratio as
// the root frame. The clipped |rect| is centered on the y value of
// the touch point. This allows tall narrow elements to be zoomed.
if (!rect.IsEmpty() && compositedArea.Width() > 0.0f) {
const float widthRatio = rect.Width() / compositedArea.Width();
float targetHeight = compositedArea.Height() * widthRatio;
if (widthRatio < 0.9 && targetHeight < rect.Height()) {
const CSSPoint scrollPoint =
CSSPoint::FromAppUnits(rootScrollFrame->GetScrollPosition());
float newY = aPoint.y + scrollPoint.y - (targetHeight * 0.5f);
if ((newY + targetHeight) > rect.YMost()) {
rect.MoveByY(rect.Height() - targetHeight);
} else if (newY > rect.Y()) {
rect.MoveToY(newY);
}
rect.SetHeight(targetHeight);
}
}
rect = CSSRect(std::max(metrics.GetScrollableRect().X(), rect.X() - margin),
rect.Y(), rect.Width() + 2 * margin, rect.Height());
// Constrict the rect to the screen's right edge
rect.SetWidth(
std::min(rect.Width(), metrics.GetScrollableRect().XMost() - rect.X()));
// If the rect is already taking up most of the visible area and is
// stretching the width of the page, then we want to zoom out instead.
if (IsRectZoomedIn(rect, compositedArea)) {
return zoomOut;
}
CSSRect rounded(rect);
rounded.Round();
// If the block we're zooming to is really tall, and the user double-tapped
// more than a screenful of height from the top of it, then adjust the
// y-coordinate so that we center the actual point the user double-tapped
// upon. This prevents flying to the top of the page when double-tapping
// to zoom in (bug 761721). The 1.2 multiplier is just a little fuzz to
// compensate for 'rect' including horizontal margins but not vertical ones.
CSSCoord cssTapY = metrics.GetScrollOffset().y + aPoint.y;
if ((rect.Height() > rounded.Height()) &&
(cssTapY > rounded.Y() + (rounded.Height() * 1.2))) {
rounded.MoveToY(cssTapY - (rounded.Height() / 2));
}
return rounded;
}