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/*
* Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2012 Google 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "core/layout/LayoutTextTrackContainer.h"
#include "core/frame/DeprecatedScheduleStyleRecalcDuringLayout.h"
#include "core/layout/LayoutVideo.h"
namespace blink {
LayoutTextTrackContainer::LayoutTextTrackContainer(Element* element)
: LayoutBlockFlow(element), m_fontSize(0) {}
void LayoutTextTrackContainer::layout() {
LayoutBlockFlow::layout();
if (style()->display() == EDisplay::None)
return;
DeprecatedScheduleStyleRecalcDuringLayout marker(
node()->document().lifecycle());
LayoutObject* mediaLayoutObject = parent();
if (!mediaLayoutObject || !mediaLayoutObject->isVideo())
return;
if (updateSizes(toLayoutVideo(*mediaLayoutObject)))
toElement(node())->setInlineStyleProperty(
CSSPropertyFontSize, m_fontSize, CSSPrimitiveValue::UnitType::Pixels);
}
bool LayoutTextTrackContainer::updateSizes(
const LayoutVideo& videoLayoutObject) {
// FIXME: The video size is used to calculate the font size (a workaround
// for lack of per-spec vh/vw support) but the whole media element is used
// for cue rendering. This is inconsistent. See also the somewhat related
// spec bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=28105
LayoutSize videoSize = videoLayoutObject.replacedContentRect().size();
float smallestDimension =
std::min(videoSize.height().toFloat(), videoSize.width().toFloat());
float fontSize = smallestDimension * 0.05f;
// Avoid excessive FP precision issue.
// C11 5.2.4.2.2:9 requires assignment and cast to remove extra precision, but
// the behavior is currently not portable. fontSize may have precision higher
// than m_fontSize thus straight comparison can fail despite they cast to the
// same float value.
volatile float& currentFontSize = m_fontSize;
float oldFontSize = currentFontSize;
currentFontSize = fontSize;
return currentFontSize != oldFontSize;
}
} // namespace blink
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