IntSize PageScaleConstraintsSet::mainFrameSize(int contentWidthIncludingScrollbar) const
{
// If there's no explicit minimum scale factor set, size the frame so that its width == content width
// so there's no horizontal scrolling at the minimum scale.
if (m_pageDefinedConstraints.minimumScale < finalConstraints().minimumScale
&& m_userAgentConstraints.minimumScale < finalConstraints().minimumScale
&& contentWidthIncludingScrollbar
&& m_viewSize.width()) {
// Special case where the contents are exactly as wide as the viewport to prevent an off-by-one due
// to floating point imprecision in the aspect ratio height calculation.
if (contentWidthIncludingScrollbar == m_viewSize.width())
return m_viewSize;
return expandedIntSize(FloatSize(
contentWidthIncludingScrollbar,
computeHeightByAspectRatio(contentWidthIncludingScrollbar, m_viewSize)));
}
// If there is a minimum scale (or there's no content size yet), the frame size should match the viewport
// size at minimum scale, since the viewport must always be contained by the frame.
FloatSize frameSize(m_viewSize);
frameSize.scale(1 / finalConstraints().minimumScale);
return expandedIntSize(frameSize);
}
void PageScaleConstraintsSet::didChangeContentsSize(IntSize contentsSize, float pageScaleFactor)
{
// If a large fixed-width element expanded the size of the document late in
// loading and our initial scale is not set (or set to be less than the last
// minimum scale), reset the page scale factor to the new initial scale.
if (contentsSize.width() > m_lastContentsWidth
&& pageScaleFactor == finalConstraints().minimumScale
&& computeConstraintsStack().initialScale < finalConstraints().minimumScale)
setNeedsReset(true);
m_constraintsDirty = true;
m_lastContentsWidth = contentsSize.width();
}
IntSize PageScaleConstraintsSet::mainFrameSize(const IntSize& contentsSize) const
{
// If there's no explicit minimum scale factor set, size the frame so that its width == content width
// so there's no horizontal scrolling at the minimum scale.
if (m_pageDefinedConstraints.minimumScale < finalConstraints().minimumScale
&& m_userAgentConstraints.minimumScale < finalConstraints().minimumScale
&& contentsSize.width()
&& m_viewSize.width())
return IntSize(contentsSize.width(), computeHeightByAspectRatio(contentsSize.width(), m_viewSize));
// If there is a minimum scale (or there's no content size yet), the frame size should match the viewport
// size at minimum scale, since the viewport must always be contained by the frame.
IntSize frameSize(m_viewSize);
frameSize.scale(1 / finalConstraints().minimumScale);
return frameSize;
}
IntSize PageScaleConstraintsSet::mainFrameSize() const
{
// The frame size should match the viewport size at minimum scale, since the
// viewport must always be contained by the frame.
FloatSize frameSize(m_viewSize);
frameSize.scale(1 / finalConstraints().minimumScale);
return expandedIntSize(frameSize);
}
