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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "VTTRegion.h"
#if ENABLE(VIDEO_TRACK)
#include "DOMRect.h"
#include "DOMTokenList.h"
#include "ElementChildIterator.h"
#include "HTMLDivElement.h"
#include "HTMLParserIdioms.h"
#include "Logging.h"
#include "RenderElement.h"
#include "VTTCue.h"
#include "VTTScanner.h"
#include "WebVTTParser.h"
#include <wtf/MathExtras.h>
namespace WebCore {
// The default values are defined within the WebVTT Regions Spec.
// https://dvcs.w3.org/hg/text-tracks/raw-file/default/608toVTT/region.html
// Default region line-height (vh units)
static const float lineHeight = 5.33;
// Default scrolling animation time period (s).
static const Seconds scrollTime { 433_ms };
VTTRegion::VTTRegion(ScriptExecutionContext& context)
: ContextDestructionObserver(&context)
, m_id(emptyString())
, m_scrollTimer(*this, &VTTRegion::scrollTimerFired)
{
}
VTTRegion::~VTTRegion() = default;
void VTTRegion::setTrack(TextTrack* track)
{
m_track = track;
}
void VTTRegion::setId(const String& id)
{
m_id = id;
}
ExceptionOr<void> VTTRegion::setWidth(double value)
{
if (!(value >= 0 && value <= 100))
return Exception { IndexSizeError };
m_width = value;
return { };
}
ExceptionOr<void> VTTRegion::setLines(int value)
{
if (value < 0)
return Exception { IndexSizeError };
m_lines = value;
return { };
}
ExceptionOr<void> VTTRegion::setRegionAnchorX(double value)
{
if (!(value >= 0 && value <= 100))
return Exception { IndexSizeError };
m_regionAnchor.setX(value);
return { };
}
ExceptionOr<void> VTTRegion::setRegionAnchorY(double value)
{
if (!(value >= 0 && value <= 100))
return Exception { IndexSizeError };
m_regionAnchor.setY(value);
return { };
}
ExceptionOr<void> VTTRegion::setViewportAnchorX(double value)
{
if (!(value >= 0 && value <= 100))
return Exception { IndexSizeError };
m_viewportAnchor.setX(value);
return { };
}
ExceptionOr<void> VTTRegion::setViewportAnchorY(double value)
{
if (!(value >= 0 && value <= 100))
return Exception { IndexSizeError };
m_viewportAnchor.setY(value);
return { };
}
static const AtomicString& upKeyword()
{
static NeverDestroyed<const AtomicString> upKeyword("up", AtomicString::ConstructFromLiteral);
return upKeyword;
}
const AtomicString& VTTRegion::scroll() const
{
return m_scroll ? upKeyword() : emptyAtom();
}
ExceptionOr<void> VTTRegion::setScroll(const AtomicString& value)
{
if (value.isEmpty()) {
m_scroll = false;
return { };
}
if (value == upKeyword()) {
m_scroll = true;
return { };
}
return Exception { SyntaxError };
}
void VTTRegion::updateParametersFromRegion(const VTTRegion& other)
{
m_lines = other.m_lines;
m_width = other.m_width;
m_regionAnchor = other.m_regionAnchor;
m_viewportAnchor = other.m_viewportAnchor;
m_scroll = other.m_scroll;
}
void VTTRegion::setRegionSettings(const String& inputString)
{
m_settings = inputString;
VTTScanner input(inputString);
while (!input.isAtEnd()) {
input.skipWhile<WebVTTParser::isValidSettingDelimiter>();
if (input.isAtEnd())
break;
// Scan the name part.
RegionSetting name = scanSettingName(input);
// Verify that we're looking at a ':'.
if (name == None || !input.scan(':')) {
input.skipUntil<isHTMLSpace<UChar>>();
continue;
}
// Scan the value part.
parseSettingValue(name, input);
}
}
VTTRegion::RegionSetting VTTRegion::scanSettingName(VTTScanner& input)
{
if (input.scan("id"))
return Id;
if (input.scan("lines"))
return Lines;
if (input.scan("width"))
return Width;
if (input.scan("viewportanchor"))
return ViewportAnchor;
if (input.scan("regionanchor"))
return RegionAnchor;
if (input.scan("scroll"))
return Scroll;
return None;
}
static inline bool parsedEntireRun(const VTTScanner& input, const VTTScanner::Run& run)
{
return input.isAt(run.end());
}
void VTTRegion::parseSettingValue(RegionSetting setting, VTTScanner& input)
{
VTTScanner::Run valueRun = input.collectUntil<isHTMLSpace<UChar>>();
switch (setting) {
case Id: {
String stringValue = input.extractString(valueRun);
if (stringValue.find("-->") == notFound)
m_id = stringValue;
break;
}
case Width: {
float floatWidth;
if (WebVTTParser::parseFloatPercentageValue(input, floatWidth) && parsedEntireRun(input, valueRun))
m_width = floatWidth;
else
LOG(Media, "VTTRegion::parseSettingValue, invalid Width");
break;
}
case Lines: {
int number;
if (input.scanDigits(number) && parsedEntireRun(input, valueRun))
m_lines = number;
else
LOG(Media, "VTTRegion::parseSettingValue, invalid Height");
break;
}
case RegionAnchor: {
FloatPoint anchor;
if (WebVTTParser::parseFloatPercentageValuePair(input, ',', anchor) && parsedEntireRun(input, valueRun))
m_regionAnchor = anchor;
else
LOG(Media, "VTTRegion::parseSettingValue, invalid RegionAnchor");
break;
}
case ViewportAnchor: {
FloatPoint anchor;
if (WebVTTParser::parseFloatPercentageValuePair(input, ',', anchor) && parsedEntireRun(input, valueRun))
m_viewportAnchor = anchor;
else
LOG(Media, "VTTRegion::parseSettingValue, invalid ViewportAnchor");
break;
}
case Scroll:
if (input.scanRun(valueRun, upKeyword()))
m_scroll = true;
else
LOG(Media, "VTTRegion::parseSettingValue, invalid Scroll");
break;
case None:
break;
}
input.skipRun(valueRun);
}
const AtomicString& VTTRegion::textTrackCueContainerScrollingClass()
{
static NeverDestroyed<const AtomicString> trackRegionCueContainerScrollingClass("scrolling", AtomicString::ConstructFromLiteral);
return trackRegionCueContainerScrollingClass;
}
const AtomicString& VTTRegion::textTrackCueContainerShadowPseudoId()
{
static NeverDestroyed<const AtomicString> trackRegionCueContainerPseudoId("-webkit-media-text-track-region-container", AtomicString::ConstructFromLiteral);
return trackRegionCueContainerPseudoId;
}
const AtomicString& VTTRegion::textTrackRegionShadowPseudoId()
{
static NeverDestroyed<const AtomicString> trackRegionShadowPseudoId("-webkit-media-text-track-region", AtomicString::ConstructFromLiteral);
return trackRegionShadowPseudoId;
}
void VTTRegion::appendTextTrackCueBox(Ref<VTTCueBox>&& displayBox)
{
ASSERT(m_cueContainer);
if (m_cueContainer->contains(displayBox.ptr()))
return;
m_cueContainer->appendChild(displayBox);
displayLastTextTrackCueBox();
}
void VTTRegion::displayLastTextTrackCueBox()
{
ASSERT(m_cueContainer);
// The container needs to be rendered, if it is not empty and the region is not currently scrolling.
if (!m_cueContainer->renderer() || !m_cueContainer->hasChildNodes() || m_scrollTimer.isActive())
return;
// If it's a scrolling region, add the scrolling class.
if (isScrollingRegion())
m_cueContainer->classList().add(textTrackCueContainerScrollingClass());
float regionBottom = m_regionDisplayTree->getBoundingClientRect()->bottom();
// Find first cue that is not entirely displayed and scroll it upwards.
for (auto& child : childrenOfType<Element>(*m_cueContainer)) {
auto rect = child.getBoundingClientRect();
float childTop = rect->top();
float childBottom = rect->bottom();
if (regionBottom >= childBottom)
continue;
float height = childBottom - childTop;
m_currentTop -= std::min(height, childBottom - regionBottom);
m_cueContainer->setInlineStyleProperty(CSSPropertyTop, m_currentTop, CSSPrimitiveValue::CSS_PX);
startTimer();
break;
}
}
void VTTRegion::willRemoveTextTrackCueBox(VTTCueBox* box)
{
LOG(Media, "VTTRegion::willRemoveTextTrackCueBox");
ASSERT(m_cueContainer->contains(box));
double boxHeight = box->getBoundingClientRect()->bottom() - box->getBoundingClientRect()->top();
m_cueContainer->classList().remove(textTrackCueContainerScrollingClass());
m_currentTop += boxHeight;
m_cueContainer->setInlineStyleProperty(CSSPropertyTop, m_currentTop, CSSPrimitiveValue::CSS_PX);
}
HTMLDivElement& VTTRegion::getDisplayTree()
{
if (!m_regionDisplayTree) {
m_regionDisplayTree = HTMLDivElement::create(downcast<Document>(*m_scriptExecutionContext));
prepareRegionDisplayTree();
}
return *m_regionDisplayTree;
}
void VTTRegion::prepareRegionDisplayTree()
{
ASSERT(m_regionDisplayTree);
// 7.2 Prepare region CSS boxes
// FIXME: Change the code below to use viewport units when
// http://crbug/244618 is fixed.
// Let regionWidth be the text track region width.
// Let width be 'regionWidth vw' ('vw' is a CSS unit)
m_regionDisplayTree->setInlineStyleProperty(CSSPropertyWidth, m_width, CSSPrimitiveValue::CSS_PERCENTAGE);
// Let lineHeight be '0.0533vh' ('vh' is a CSS unit) and regionHeight be
// the text track region height. Let height be 'lineHeight' multiplied
// by regionHeight.
double height = lineHeight * m_lines;
m_regionDisplayTree->setInlineStyleProperty(CSSPropertyHeight, height, CSSPrimitiveValue::CSS_VH);
// Let viewportAnchorX be the x dimension of the text track region viewport
// anchor and regionAnchorX be the x dimension of the text track region
// anchor. Let leftOffset be regionAnchorX multiplied by width divided by
// 100.0. Let left be leftOffset subtracted from 'viewportAnchorX vw'.
double leftOffset = m_regionAnchor.x() * m_width / 100;
m_regionDisplayTree->setInlineStyleProperty(CSSPropertyLeft, m_viewportAnchor.x() - leftOffset, CSSPrimitiveValue::CSS_PERCENTAGE);
// Let viewportAnchorY be the y dimension of the text track region viewport
// anchor and regionAnchorY be the y dimension of the text track region
// anchor. Let topOffset be regionAnchorY multiplied by height divided by
// 100.0. Let top be topOffset subtracted from 'viewportAnchorY vh'.
double topOffset = m_regionAnchor.y() * height / 100;
m_regionDisplayTree->setInlineStyleProperty(CSSPropertyTop, m_viewportAnchor.y() - topOffset, CSSPrimitiveValue::CSS_PERCENTAGE);
// The cue container is used to wrap the cues and it is the object which is
// gradually scrolled out as multiple cues are appended to the region.
m_cueContainer = HTMLDivElement::create(downcast<Document>(*m_scriptExecutionContext));
m_cueContainer->setInlineStyleProperty(CSSPropertyTop, 0.0f, CSSPrimitiveValue::CSS_PX);
m_cueContainer->setPseudo(textTrackCueContainerShadowPseudoId());
m_regionDisplayTree->appendChild(*m_cueContainer);
// 7.5 Every WebVTT region object is initialised with the following CSS
m_regionDisplayTree->setPseudo(textTrackRegionShadowPseudoId());
}
void VTTRegion::startTimer()
{
LOG(Media, "VTTRegion::startTimer");
if (m_scrollTimer.isActive())
return;
Seconds duration = isScrollingRegion() ? scrollTime : 0_s;
m_scrollTimer.startOneShot(duration);
}
void VTTRegion::stopTimer()
{
LOG(Media, "VTTRegion::stopTimer");
if (m_scrollTimer.isActive())
m_scrollTimer.stop();
}
void VTTRegion::scrollTimerFired()
{
LOG(Media, "VTTRegion::scrollTimerFired");
stopTimer();
displayLastTextTrackCueBox();
}
} // namespace WebCore
#endif