| /* |
| * 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& m_fontSize = this->m_fontSize; |
| float oldFontSize = m_fontSize; |
| m_fontSize = fontSize; |
| return m_fontSize != oldFontSize; |
| } |
| |
| } // namespace blink |