Index: Source/core/html/track/TextTrackContainer.cpp |
diff --git a/Source/core/html/track/TextTrackContainer.cpp b/Source/core/html/track/TextTrackContainer.cpp |
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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. |
+ * 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 "core/html/track/TextTrackContainer.h" |
+ |
+#include "core/html/HTMLVideoElement.h" |
+#include "core/html/track/CueTimeline.h" |
+#include "core/layout/LayoutTextTrackContainer.h" |
+#include "core/layout/LayoutVideo.h" |
+ |
+namespace blink { |
+ |
+TextTrackContainer::TextTrackContainer(Document& document) |
+ : HTMLDivElement(document) |
+ , m_fontSize(0) |
+{ |
+} |
+ |
+PassRefPtrWillBeRawPtr<TextTrackContainer> TextTrackContainer::create(Document& document) |
+{ |
+ RefPtrWillBeRawPtr<TextTrackContainer> element = adoptRefWillBeNoop(new TextTrackContainer(document)); |
+ element->setShadowPseudoId(AtomicString("-webkit-media-text-track-container", AtomicString::ConstructFromLiteral)); |
+ element->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone); |
+ return element.release(); |
+} |
+ |
+LayoutObject* TextTrackContainer::createLayoutObject(const LayoutStyle&) |
+{ |
+ return new LayoutTextTrackContainer(this); |
+} |
+ |
+void TextTrackContainer::updateDisplay(HTMLMediaElement& mediaElement) |
+{ |
+ if (!mediaElement.closedCaptionsVisible()) { |
+ removeChildren(); |
+ return; |
+ } |
+ |
+ // 1. If the media element is an audio element, or is another playback |
+ // mechanism with no rendering area, abort these steps. There is nothing to |
+ // render. |
+ if (isHTMLAudioElement(mediaElement)) |
+ return; |
+ |
+ // 2. Let video be the media element or other playback mechanism. |
+ HTMLVideoElement& video = toHTMLVideoElement(mediaElement); |
+ |
+ // 3. Let output be an empty list of absolutely positioned CSS block boxes. |
+ |
+ // 4. If the user agent is exposing a user interface for video, add to |
+ // output one or more completely transparent positioned CSS block boxes that |
+ // cover the same region as the user interface. |
+ |
+ // 5. If the last time these rules were run, the user agent was not exposing |
+ // a user interface for video, but now it is, let reset be true. Otherwise, |
+ // let reset be false. |
+ |
+ // There is nothing to be done explicitly for 4th and 5th steps, as |
+ // everything is handled through CSS. The caption box is on top of the |
+ // controls box, in a container set with the -webkit-box display property. |
+ |
+ // 6. Let tracks be the subset of video's list of text tracks that have as |
+ // their rules for updating the text track rendering these rules for |
+ // updating the display of WebVTT text tracks, and whose text track mode is |
+ // showing or showing by default. |
+ // 7. Let cues be an empty list of text track cues. |
+ // 8. For each track track in tracks, append to cues all the cues from |
+ // track's list of cues that have their text track cue active flag set. |
+ CueList activeCues = video.cueTimeline().currentlyActiveCues(); |
+ |
+ // 9. If reset is false, then, for each text track cue cue in cues: if cue's |
+ // text track cue display state has a set of CSS boxes, then add those boxes |
+ // to output, and remove cue from cues. |
+ |
+ // There is nothing explicitly to be done here, as all the caching occurs |
+ // within the TextTrackCue instance itself. If parameters of the cue change, |
+ // the display tree is cleared. |
+ |
+ // 10. For each text track cue cue in cues that has not yet had |
+ // corresponding CSS boxes added to output, in text track cue order, run the |
+ // following substeps: |
+ for (size_t i = 0; i < activeCues.size(); ++i) { |
+ TextTrackCue* cue = activeCues[i].data(); |
+ |
+ ASSERT(cue->isActive()); |
+ if (!cue->track() || !cue->track()->isRendered() || !cue->isActive()) |
+ continue; |
+ |
+ cue->updateDisplay(*this); |
+ } |
+ |
+ // 11. Return output. |
+ if (hasChildren()) |
+ removeInlineStyleProperty(CSSPropertyDisplay); |
+ else |
+ setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone); |
+} |
+ |
+void TextTrackContainer::updateSizes(LayoutObject* mediaElementLayoutObject) |
+{ |
+ if (!document().isActive()) |
+ return; |
+ |
+ if (!mediaElementLayoutObject || !mediaElementLayoutObject->isVideo()) |
+ return; |
+ |
+ // 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 |
+ IntSize videoSize = toLayoutVideo(mediaElementLayoutObject)->videoBox().size(); |
+ |
+ if (m_videoSize == videoSize) |
+ return; |
+ m_videoSize = videoSize; |
+ |
+ float smallestDimension = std::min(m_videoSize.height(), m_videoSize.width()); |
+ |
+ float fontSize = smallestDimension * 0.05f; |
+ if (fontSize != m_fontSize) { |
+ m_fontSize = fontSize; |
+ setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX); |
+ } |
+} |
+ |
+} // namespace blink |