static void appendServerMapMousePosition(StringBuilder& url, Event* event)
{
if (!event->isMouseEvent())
return;
ASSERT(event->target());
Node* target = event->target()->toNode();
ASSERT(target);
if (!isHTMLImageElement(*target))
return;
HTMLImageElement& imageElement = toHTMLImageElement(*target);
if (!imageElement.isServerMap())
return;
LayoutObject* layoutObject = imageElement.layoutObject();
if (!layoutObject || !layoutObject->isBox())
return;
// The coordinates sent in the query string are relative to the height and
// width of the image element, ignoring CSS transform/zoom.
LayoutPoint mapPoint(layoutObject->absoluteToLocal(FloatPoint(toMouseEvent(event)->absoluteLocation()), UseTransforms));
// The origin (0,0) is at the upper left of the content area, inside the
// padding and border.
mapPoint -= toLayoutBox(layoutObject)->contentBoxOffset();
// CSS zoom is not reflected in the map coordinates.
float scaleFactor = 1 / layoutObject->style()->effectiveZoom();
mapPoint.scale(scaleFactor, scaleFactor);
// Negative coordinates are clamped to 0 such that clicks in the left and
// top padding/border areas receive an X or Y coordinate of 0.
IntPoint clampedPoint(roundedIntPoint(mapPoint));
clampedPoint.clampNegativeToZero();
url.append('?');
url.appendNumber(clampedPoint.x());
url.append(',');
url.appendNumber(clampedPoint.y());
}
static FloatPoint convertAbsoluteLocationForLayoutObjectFloat(const LayoutPoint& location, const LayoutObject& layoutObject)
{
return layoutObject.absoluteToLocal(FloatPoint(location), UseTransforms);
}
