bool PageViewportController::updateMinimumScaleToFit(bool userInitiatedUpdate)
{
if (m_viewportSize.isEmpty() || m_contentsSize.isEmpty())
return false;
bool currentlyScaledToFit = fuzzyCompare(m_effectiveScale, toViewportScale(m_minimumScaleToFit), 0.001);
float minimumScale = WebCore::computeMinimumScaleFactorForContentContained(m_rawAttributes, WebCore::roundedIntSize(m_viewportSize), WebCore::roundedIntSize(m_contentsSize), devicePixelRatio());
if (minimumScale <= 0)
return false;
if (!fuzzyCompare(minimumScale, m_minimumScaleToFit, 0.001)) {
m_minimumScaleToFit = minimumScale;
if (!hasSuspendedContent()) {
if (!m_hadUserInteraction || (userInitiatedUpdate && currentlyScaledToFit))
applyScaleAfterRenderingContents(toViewportScale(m_minimumScaleToFit));
else {
// Ensure the effective scale stays within bounds.
float boundedScale = innerBoundedViewportScale(m_effectiveScale);
if (!fuzzyCompare(boundedScale, m_effectiveScale, 0.001))
applyScaleAfterRenderingContents(boundedScale);
}
}
return true;
}
return false;
}
float PageViewportController::outerBoundedViewportScale(float viewportScale) const
{
if (m_allowsUserScaling) {
// Bounded by [0.1, 10.0] like the viewport meta code in WebCore.
float hardMin = toViewportScale(std::max<float>(0.1, 0.5 * m_minimumScaleToFit));
float hardMax = toViewportScale(std::min<float>(10, 2 * m_rawAttributes.maximumScale));
return clampTo(viewportScale, hardMin, hardMax);
}
return innerBoundedViewportScale(viewportScale);
}
void PageViewportController::pageTransitionViewportReady()
{
if (!m_rawAttributes.layoutSize.isEmpty()) {
m_hadUserInteraction = false;
ASSERT(m_rawAttributes.initialScale > 0);
applyScaleAfterRenderingContents(innerBoundedViewportScale(toViewportScale(m_rawAttributes.initialScale)));
}
// At this point we should already have received the first viewport arguments and the requested scroll
// position for the newly loaded page and sent our reactions to the web process. It's now safe to tell
// the web process to start rendering the new page contents and possibly re-use the current tiles.
// This assumes that all messages have been handled in order and that nothing has been pushed back on the event loop.
m_webPageProxy->commitPageTransitionViewport();
}
void PageViewportController::resumeContent()
{
if (!m_rawAttributes.layoutSize.isEmpty() && m_rawAttributes.initialScale > 0) {
m_hadUserInteraction = false;
m_client->setContentsScale(innerBoundedViewportScale(toViewportScale(m_rawAttributes.initialScale)), /* isInitialScale */ true);
m_rawAttributes.initialScale = -1; // Mark used.
}
m_client->didResumeContent();
if (!m_hasSuspendedContent)
return;
m_hasSuspendedContent = false;
m_webPageProxy->resumeActiveDOMObjectsAndAnimations();
}
