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| 1 /* | |
| 2 * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. | |
| 3 * Copyright (C) 2012 Google Inc. | |
| 4 * All rights reserved. | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions | |
| 8 * are met: | |
| 9 * 1. Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * 2. Redistributions in binary form must reproduce the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer in the | |
| 13 * documentation and/or other materials provided with the distribution. | |
| 14 * | |
| 15 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "core/layout/LayoutTextTrackContainer.h" | |
| 29 | |
| 30 #include "core/frame/DeprecatedScheduleStyleRecalcDuringLayout.h" | |
| 31 #include "core/layout/LayoutVideo.h" | |
| 32 | |
| 33 namespace blink { | |
| 34 | |
| 35 LayoutTextTrackContainer::LayoutTextTrackContainer(Element* element) | |
| 36 : LayoutBlockFlow(element), m_fontSize(0) {} | |
| 37 | |
| 38 void LayoutTextTrackContainer::layout() { | |
| 39 LayoutBlockFlow::layout(); | |
| 40 if (style()->display() == EDisplay::kNone) | |
| 41 return; | |
| 42 | |
| 43 DeprecatedScheduleStyleRecalcDuringLayout marker( | |
| 44 node()->document().lifecycle()); | |
| 45 | |
| 46 LayoutObject* mediaLayoutObject = parent(); | |
| 47 if (!mediaLayoutObject || !mediaLayoutObject->isVideo()) | |
| 48 return; | |
| 49 if (updateSizes(toLayoutVideo(*mediaLayoutObject))) | |
| 50 toElement(node())->setInlineStyleProperty( | |
| 51 CSSPropertyFontSize, m_fontSize, CSSPrimitiveValue::UnitType::Pixels); | |
| 52 } | |
| 53 | |
| 54 bool LayoutTextTrackContainer::updateSizes( | |
| 55 const LayoutVideo& videoLayoutObject) { | |
| 56 // FIXME: The video size is used to calculate the font size (a workaround | |
| 57 // for lack of per-spec vh/vw support) but the whole media element is used | |
| 58 // for cue rendering. This is inconsistent. See also the somewhat related | |
| 59 // spec bug: https://www.w3.org/Bugs/Public/show_bug.cgi?id=28105 | |
| 60 LayoutSize videoSize = videoLayoutObject.replacedContentRect().size(); | |
| 61 | |
| 62 float smallestDimension = | |
| 63 std::min(videoSize.height().toFloat(), videoSize.width().toFloat()); | |
| 64 | |
| 65 float fontSize = smallestDimension * 0.05f; | |
| 66 | |
| 67 // Avoid excessive FP precision issue. | |
| 68 // C11 5.2.4.2.2:9 requires assignment and cast to remove extra precision, but | |
| 69 // the behavior is currently not portable. fontSize may have precision higher | |
| 70 // than m_fontSize thus straight comparison can fail despite they cast to the | |
| 71 // same float value. | |
| 72 volatile float& currentFontSize = m_fontSize; | |
| 73 float oldFontSize = currentFontSize; | |
| 74 currentFontSize = fontSize; | |
| 75 return currentFontSize != oldFontSize; | |
| 76 } | |
| 77 | |
| 78 } // namespace blink | |
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Chromium Code Reviews
Issue 2803243002:
Use a ResizeObserver to determine default font-size for text tracks (Closed)
