PassRefPtrWillBeRawPtr<DocumentFragment> VTTCue::createCueRenderingTree()
{
createVTTNodeTree();
RefPtrWillBeRawPtr<DocumentFragment> clonedFragment = DocumentFragment::create(document());
m_vttNodeTree->cloneChildNodes(clonedFragment.get());
return clonedFragment.release();
}
PassRefPtrWillBeRawPtr<DocumentFragment> VTTCue::getCueAsHTML()
{
createVTTNodeTree();
RefPtrWillBeRawPtr<DocumentFragment> clonedFragment = DocumentFragment::create(document());
copyVTTNodeToDOMTree(m_vttNodeTree.get(), clonedFragment.get());
return clonedFragment.release();
}
DocumentFragment* VTTCue::getCueAsHTML()
{
createVTTNodeTree();
DocumentFragment* clonedFragment = DocumentFragment::create(document());
copyVTTNodeToDOMTree(m_vttNodeTree.get(), clonedFragment);
return clonedFragment;
}
PassRefPtrWillBeRawPtr<VTTCueBox> VTTCue::getDisplayTree()
{
ASSERT(track() && track()->isRendered() && isActive());
if (!m_displayTree) {
m_displayTree = VTTCueBox::create(document(), this);
m_displayTree->appendChild(m_cueBackgroundBox);
}
ASSERT(m_displayTree->firstChild() == m_cueBackgroundBox);
if (!m_displayTreeShouldChange) {
// Apply updated user style overrides for text tracks when display tree doesn't change.
// This ensures that the track settings are refreshed when the video is
// replayed or when the user slides back to an already rendered track.
applyUserOverrideCSSProperties();
return m_displayTree;
}
createVTTNodeTree();
m_cueBackgroundBox->removeChildren();
m_vttNodeTree->cloneChildNodes(m_cueBackgroundBox.get());
VTTDisplayParameters displayParameters = calculateDisplayParameters();
m_displayTree->applyCSSProperties(displayParameters);
// Apply user override settings for text tracks
applyUserOverrideCSSProperties();
m_displayTreeShouldChange = false;
return m_displayTree;
}
VTTCueBox* VTTCue::getDisplayTree()
{
ASSERT(track() && track()->isRendered() && isActive());
if (!m_displayTree) {
m_displayTree = VTTCueBox::create(document());
m_displayTree->appendChild(m_cueBackgroundBox);
}
ASSERT(m_displayTree->firstChild() == m_cueBackgroundBox);
if (!m_displayTreeShouldChange) {
// Apply updated user style overrides for text tracks when display tree doesn't change.
// This ensures that the track settings are refreshed when the video is
// replayed or when the user slides back to an already rendered track.
applyUserOverrideCSSProperties();
return m_displayTree;
}
createVTTNodeTree();
m_cueBackgroundBox->removeChildren();
m_vttNodeTree->cloneChildNodes(m_cueBackgroundBox.get());
// TODO(philipj): The region identifier may be non-empty without there being
// a corresponding region, in which case this VTTCueBox will be added
// directly to the text track container in updateDisplay().
if (regionId().isEmpty()) {
VTTDisplayParameters displayParameters = calculateDisplayParameters();
m_displayTree->applyCSSProperties(displayParameters);
} else {
m_displayTree->setInlineStyleProperty(CSSPropertyPosition, CSSValueRelative);
}
// Apply user override settings for text tracks
applyUserOverrideCSSProperties();
m_displayTreeShouldChange = false;
return m_displayTree;
}
void VTTCue::calculateDisplayParameters()
{
createVTTNodeTree();
// Steps 10.2, 10.3
m_displayDirection = determineTextDirection(m_vttNodeTree.get());
if (m_displayDirection == CSSValueRtl)
UseCounter::count(document(), UseCounter::VTTCueRenderRtl);
// 10.4 If the text track cue writing direction is horizontal, then let
// block-flow be 'tb'. Otherwise, if the text track cue writing direction is
// vertical growing left, then let block-flow be 'lr'. Otherwise, the text
// track cue writing direction is vertical growing right; let block-flow be
// 'rl'.
// The above step is done through the writing direction static map.
// 10.5 Determine the value of maximum size for cue as per the appropriate
// rules from the following list:
int maximumSize = m_textPosition;
if ((m_writingDirection == Horizontal && m_cueAlignment == Start && m_displayDirection == CSSValueLtr)
|| (m_writingDirection == Horizontal && m_cueAlignment == End && m_displayDirection == CSSValueRtl)
|| (m_writingDirection == Horizontal && m_cueAlignment == Left)
|| (m_writingDirection == VerticalGrowingLeft && (m_cueAlignment == Start || m_cueAlignment == Left))
|| (m_writingDirection == VerticalGrowingRight && (m_cueAlignment == Start || m_cueAlignment == Left))) {
maximumSize = 100 - m_textPosition;
} else if ((m_writingDirection == Horizontal && m_cueAlignment == End && m_displayDirection == CSSValueLtr)
|| (m_writingDirection == Horizontal && m_cueAlignment == Start && m_displayDirection == CSSValueRtl)
|| (m_writingDirection == Horizontal && m_cueAlignment == Right)
|| (m_writingDirection == VerticalGrowingLeft && (m_cueAlignment == End || m_cueAlignment == Right))
|| (m_writingDirection == VerticalGrowingRight && (m_cueAlignment == End || m_cueAlignment == Right))) {
maximumSize = m_textPosition;
} else if (m_cueAlignment == Middle) {
maximumSize = m_textPosition <= 50 ? m_textPosition : (100 - m_textPosition);
maximumSize = maximumSize * 2;
} else {
ASSERT_NOT_REACHED();
}
// 10.6 If the text track cue size is less than maximum size, then let size
// be text track cue size. Otherwise, let size be maximum size.
m_displaySize = std::min(m_cueSize, maximumSize);
// FIXME: Understand why step 10.7 is missing (just a copy/paste error?)
// Could be done within a spec implementation check - http://crbug.com/301580
// 10.8 Determine the value of x-position or y-position for cue as per the
// appropriate rules from the following list:
if (m_writingDirection == Horizontal) {
switch (m_cueAlignment) {
case Start:
if (m_displayDirection == CSSValueLtr)
m_displayPosition.first = m_textPosition;
else
m_displayPosition.first = 100 - m_textPosition - m_displaySize;
break;
case End:
if (m_displayDirection == CSSValueRtl)
m_displayPosition.first = 100 - m_textPosition;
else
m_displayPosition.first = m_textPosition - m_displaySize;
break;
case Left:
if (m_displayDirection == CSSValueLtr)
m_displayPosition.first = m_textPosition;
else
m_displayPosition.first = 100 - m_textPosition;
break;
case Right:
if (m_displayDirection == CSSValueLtr)
m_displayPosition.first = m_textPosition - m_displaySize;
else
m_displayPosition.first = 100 - m_textPosition - m_displaySize;
break;
case Middle:
if (m_displayDirection == CSSValueLtr)
m_displayPosition.first = m_textPosition - m_displaySize / 2;
else
m_displayPosition.first = 100 - m_textPosition - m_displaySize / 2;
break;
default:
ASSERT_NOT_REACHED();
}
} else {
// Cases for m_writingDirection being VerticalGrowing{Left|Right}
switch (m_cueAlignment) {
case Start:
case Left:
m_displayPosition.second = m_textPosition;
break;
case End:
case Right:
m_displayPosition.second = m_textPosition - m_displaySize;
break;
case Middle:
m_displayPosition.second = m_textPosition - m_displaySize / 2;
break;
default:
ASSERT_NOT_REACHED();
}
}
// A text track cue has a text track cue computed line position whose value
// is defined in terms of the other aspects of the cue.
m_computedLinePosition = calculateComputedLinePosition();
// 10.9 Determine the value of whichever of x-position or y-position is not
// yet calculated for cue as per the appropriate rules from the following
// list:
if (m_snapToLines && m_displayPosition.second == undefinedPosition && m_writingDirection == Horizontal)
m_displayPosition.second = 0;
if (!m_snapToLines && m_displayPosition.second == undefinedPosition && m_writingDirection == Horizontal)
m_displayPosition.second = m_computedLinePosition;
if (m_snapToLines && m_displayPosition.first == undefinedPosition
&& (m_writingDirection == VerticalGrowingLeft || m_writingDirection == VerticalGrowingRight))
m_displayPosition.first = 0;
if (!m_snapToLines && (m_writingDirection == VerticalGrowingLeft || m_writingDirection == VerticalGrowingRight))
m_displayPosition.first = m_computedLinePosition;
}
