1/*
2 * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "core/html/HTMLVideoElement.h"
28
29#include "bindings/core/v8/ExceptionState.h"
30#include "core/CSSPropertyNames.h"
31#include "core/HTMLNames.h"
32#include "core/dom/Attribute.h"
33#include "core/dom/Document.h"
34#include "core/dom/ExceptionCode.h"
35#include "core/dom/shadow/ShadowRoot.h"
36#include "core/frame/Settings.h"
37#include "core/html/HTMLImageLoader.h"
38#include "core/html/canvas/CanvasRenderingContext.h"
39#include "core/html/parser/HTMLParserIdioms.h"
40#include "core/rendering/RenderImage.h"
41#include "core/rendering/RenderVideo.h"
42#include "platform/UserGestureIndicator.h"
43#include "platform/graphics/GraphicsContext.h"
44#include "platform/graphics/gpu/Extensions3DUtil.h"
45#include "public/platform/WebCanvas.h"
46#include "public/platform/WebGraphicsContext3D.h"
47
48namespace blink {
49
50using namespace HTMLNames;
51
52inline HTMLVideoElement::HTMLVideoElement(Document& document)
53    : HTMLMediaElement(videoTag, document)
54{
55    if (document.settings())
56        m_defaultPosterURL = AtomicString(document.settings()->defaultVideoPosterURL());
57}
58
59PassRefPtrWillBeRawPtr<HTMLVideoElement> HTMLVideoElement::create(Document& document)
60{
61    RefPtrWillBeRawPtr<HTMLVideoElement> video = adoptRefWillBeNoop(new HTMLVideoElement(document));
62    video->ensureUserAgentShadowRoot();
63    video->suspendIfNeeded();
64    return video.release();
65}
66
67void HTMLVideoElement::trace(Visitor* visitor)
68{
69    visitor->trace(m_imageLoader);
70    HTMLMediaElement::trace(visitor);
71}
72
73bool HTMLVideoElement::rendererIsNeeded(const RenderStyle& style)
74{
75    return HTMLElement::rendererIsNeeded(style);
76}
77
78RenderObject* HTMLVideoElement::createRenderer(RenderStyle*)
79{
80    return new RenderVideo(this);
81}
82
83void HTMLVideoElement::attach(const AttachContext& context)
84{
85    HTMLMediaElement::attach(context);
86
87    updateDisplayState();
88    if (shouldDisplayPosterImage()) {
89        if (!m_imageLoader)
90            m_imageLoader = HTMLImageLoader::create(this);
91        m_imageLoader->updateFromElement();
92        if (renderer())
93            toRenderImage(renderer())->imageResource()->setImageResource(m_imageLoader->image());
94    }
95}
96
97void HTMLVideoElement::collectStyleForPresentationAttribute(const QualifiedName& name, const AtomicString& value, MutableStylePropertySet* style)
98{
99    if (name == widthAttr)
100        addHTMLLengthToStyle(style, CSSPropertyWidth, value);
101    else if (name == heightAttr)
102        addHTMLLengthToStyle(style, CSSPropertyHeight, value);
103    else
104        HTMLMediaElement::collectStyleForPresentationAttribute(name, value, style);
105}
106
107bool HTMLVideoElement::isPresentationAttribute(const QualifiedName& name) const
108{
109    if (name == widthAttr || name == heightAttr)
110        return true;
111    return HTMLMediaElement::isPresentationAttribute(name);
112}
113
114void HTMLVideoElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
115{
116    if (name == posterAttr) {
117        // Force a poster recalc by setting m_displayMode to Unknown directly before calling updateDisplayState.
118        HTMLMediaElement::setDisplayMode(Unknown);
119        updateDisplayState();
120        if (shouldDisplayPosterImage()) {
121            if (!m_imageLoader)
122                m_imageLoader = HTMLImageLoader::create(this);
123            m_imageLoader->updateFromElement(ImageLoader::UpdateIgnorePreviousError);
124        } else {
125            if (renderer())
126                toRenderImage(renderer())->imageResource()->setImageResource(0);
127        }
128        // Notify the player when the poster image URL changes.
129        if (webMediaPlayer())
130            webMediaPlayer()->setPoster(posterImageURL());
131    } else {
132        HTMLMediaElement::parseAttribute(name, value);
133    }
134}
135
136bool HTMLVideoElement::supportsFullscreen() const
137{
138    if (!document().page())
139        return false;
140
141    if (!webMediaPlayer())
142        return false;
143
144    return true;
145}
146
147unsigned HTMLVideoElement::videoWidth() const
148{
149    if (!webMediaPlayer())
150        return 0;
151    return webMediaPlayer()->naturalSize().width;
152}
153
154unsigned HTMLVideoElement::videoHeight() const
155{
156    if (!webMediaPlayer())
157        return 0;
158    return webMediaPlayer()->naturalSize().height;
159}
160
161bool HTMLVideoElement::isURLAttribute(const Attribute& attribute) const
162{
163    return attribute.name() == posterAttr || HTMLMediaElement::isURLAttribute(attribute);
164}
165
166const AtomicString HTMLVideoElement::imageSourceURL() const
167{
168    const AtomicString& url = getAttribute(posterAttr);
169    if (!stripLeadingAndTrailingHTMLSpaces(url).isEmpty())
170        return url;
171    return m_defaultPosterURL;
172}
173
174void HTMLVideoElement::setDisplayMode(DisplayMode mode)
175{
176    DisplayMode oldMode = displayMode();
177    KURL poster = posterImageURL();
178
179    if (!poster.isEmpty()) {
180        // We have a poster path, but only show it until the user triggers display by playing or seeking and the
181        // media engine has something to display.
182        // Don't show the poster if there is a seek operation or
183        // the video has restarted because of loop attribute
184        if (mode == Video && oldMode == Poster && !hasAvailableVideoFrame())
185            mode = PosterWaitingForVideo;
186    }
187
188    HTMLMediaElement::setDisplayMode(mode);
189
190    if (renderer() && displayMode() != oldMode)
191        renderer()->updateFromElement();
192}
193
194void HTMLVideoElement::updateDisplayState()
195{
196    if (posterImageURL().isEmpty())
197        setDisplayMode(Video);
198    else if (displayMode() < Poster)
199        setDisplayMode(Poster);
200}
201
202void HTMLVideoElement::paintCurrentFrameInContext(GraphicsContext* context, const IntRect& destRect) const
203{
204    if (!webMediaPlayer())
205        return;
206
207    WebCanvas* canvas = context->canvas();
208    SkXfermode::Mode mode = WebCoreCompositeToSkiaComposite(context->compositeOperation(), context->blendModeOperation());
209    webMediaPlayer()->paint(canvas, destRect, context->getNormalizedAlpha(), mode);
210}
211
212bool HTMLVideoElement::copyVideoTextureToPlatformTexture(WebGraphicsContext3D* context, Platform3DObject texture, GLint level, GLenum internalFormat, GLenum type, bool premultiplyAlpha, bool flipY)
213{
214    if (!webMediaPlayer())
215        return false;
216
217    if (!Extensions3DUtil::canUseCopyTextureCHROMIUM(internalFormat, type, level))
218        return false;
219
220    return webMediaPlayer()->copyVideoTextureToPlatformTexture(context, texture, level, internalFormat, type, premultiplyAlpha, flipY);
221}
222
223bool HTMLVideoElement::hasAvailableVideoFrame() const
224{
225    if (!webMediaPlayer())
226        return false;
227
228    return webMediaPlayer()->hasVideo() && webMediaPlayer()->readyState() >= blink::WebMediaPlayer::ReadyStateHaveCurrentData;
229}
230
231void HTMLVideoElement::webkitEnterFullscreen(ExceptionState& exceptionState)
232{
233    if (isFullscreen())
234        return;
235
236    if (!supportsFullscreen()) {
237        exceptionState.throwDOMException(InvalidStateError, "This element does not support fullscreen mode.");
238        return;
239    }
240
241    enterFullscreen();
242}
243
244void HTMLVideoElement::webkitExitFullscreen()
245{
246    if (isFullscreen())
247        exitFullscreen();
248}
249
250bool HTMLVideoElement::webkitSupportsFullscreen()
251{
252    return supportsFullscreen();
253}
254
255bool HTMLVideoElement::webkitDisplayingFullscreen()
256{
257    return isFullscreen();
258}
259
260void HTMLVideoElement::didMoveToNewDocument(Document& oldDocument)
261{
262    if (m_imageLoader)
263        m_imageLoader->elementDidMoveToNewDocument();
264    HTMLMediaElement::didMoveToNewDocument(oldDocument);
265}
266
267unsigned HTMLVideoElement::webkitDecodedFrameCount() const
268{
269    if (!webMediaPlayer())
270        return 0;
271
272    return webMediaPlayer()->decodedFrameCount();
273}
274
275unsigned HTMLVideoElement::webkitDroppedFrameCount() const
276{
277    if (!webMediaPlayer())
278        return 0;
279
280    return webMediaPlayer()->droppedFrameCount();
281}
282
283KURL HTMLVideoElement::posterImageURL() const
284{
285    String url = stripLeadingAndTrailingHTMLSpaces(imageSourceURL());
286    if (url.isEmpty())
287        return KURL();
288    return document().completeURL(url);
289}
290
291KURL HTMLVideoElement::mediaPlayerPosterURL()
292{
293    return posterImageURL();
294}
295
296PassRefPtr<Image> HTMLVideoElement::getSourceImageForCanvas(SourceImageMode mode, SourceImageStatus* status) const
297{
298    if (!hasAvailableVideoFrame()) {
299        *status = InvalidSourceImageStatus;
300        return nullptr;
301    }
302
303    IntSize intrinsicSize(videoWidth(), videoHeight());
304    OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(intrinsicSize);
305    if (!imageBuffer) {
306        *status = InvalidSourceImageStatus;
307        return nullptr;
308    }
309
310    paintCurrentFrameInContext(imageBuffer->context(), IntRect(IntPoint(0, 0), intrinsicSize));
311
312    *status = NormalSourceImageStatus;
313    return imageBuffer->copyImage(mode == CopySourceImageIfVolatile ? CopyBackingStore : DontCopyBackingStore, Unscaled);
314}
315
316bool HTMLVideoElement::wouldTaintOrigin(SecurityOrigin* destinationSecurityOrigin) const
317{
318    return !hasSingleSecurityOrigin() || (!(webMediaPlayer() && webMediaPlayer()->didPassCORSAccessCheck()) && destinationSecurityOrigin->taintsCanvas(currentSrc()));
319}
320
321FloatSize HTMLVideoElement::sourceSize() const
322{
323    return FloatSize(videoWidth(), videoHeight());
324}
325
326}
327