void Canvas2DLayerBridge::didProcessTask()
{
TRACE_EVENT0("cc", "Canvas2DLayerBridge::didProcessTask");
ASSERT(m_isRegisteredTaskObserver);
// If m_renderTaskProcessedForCurrentFrame is already set to true,
// it means that rendering tasks are not synchronized with the compositor
// (i.e. not using requestAnimationFrame), so we are at risk of posting
// a multi-frame backlog to the GPU
if (m_renderingTaskCompletedForCurrentFrame) {
if (isAccelerated()) {
flushGpu();
if (!m_rateLimiter) {
m_rateLimiter = SharedContextRateLimiter::create(MaxCanvasAnimationBacklog);
}
} else {
flush();
}
}
if (m_rateLimiter) {
m_rateLimiter->tick();
}
m_renderingTaskCompletedForCurrentFrame = true;
unregisterTaskObserver();
}
double KeyframeAnimation::timeToNextService()
{
double t = AnimationBase::timeToNextService();
#if USE(ACCELERATED_COMPOSITING)
if (t != 0 || preActive())
return t;
// A return value of 0 means we need service. But if we only have accelerated animations we
// only need service at the end of the transition
HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
bool acceleratedPropertiesOnly = true;
for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
if (!animationOfPropertyIsAccelerated(*it) || !isAccelerated()) {
acceleratedPropertiesOnly = false;
break;
}
}
if (acceleratedPropertiesOnly) {
bool isLooping;
getTimeToNextEvent(t, isLooping);
}
#endif
return t;
}
bool Canvas2DLayerBridge::restoreSurface()
{
ASSERT(!m_destructionInProgress);
if (m_destructionInProgress)
return false;
ASSERT(isAccelerated() && !m_surface);
WebGraphicsContext3D* sharedContext = 0;
m_layer->clearTexture();
m_contextProvider = adoptPtr(Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
if (m_contextProvider)
sharedContext = m_contextProvider->context3d();
if (sharedContext && !sharedContext->isContextLost()) {
GrContext* grCtx = m_contextProvider->grContext();
bool surfaceIsAccelerated;
RefPtr<SkSurface> surface(createSkSurface(grCtx, m_size, m_msaaSampleCount, m_opacityMode, &surfaceIsAccelerated));
// Current paradigm does support switching from accelerated to non-accelerated, which would be tricky
// due to changes to the layer tree, which can only happen at specific times during the document lifecycle.
// Therefore, we can only accept the restored surface if it is accelerated.
if (surface.get() && surfaceIsAccelerated) {
m_surface = surface.release();
// FIXME: draw sad canvas picture into new buffer crbug.com/243842
}
}
return m_surface;
}
void Canvas2DLayerBridge::flushGpu()
{
TRACE_EVENT0("cc", "Canvas2DLayerBridge::flushGpu");
flush();
WebGraphicsContext3D* webContext = context();
if (isAccelerated() && webContext)
webContext->flush();
}
bool PlatformContextSkia::isNativeFontRenderingAllowed()
{
#if USE(SKIA_TEXT)
return false;
#else
if (isAccelerated())
return false;
return skia::SupportsPlatformPaint(m_canvas);
#endif
}
void Canvas2DLayerBridge::mailboxReleased(const WebExternalTextureMailbox& mailbox, bool lostResource)
{
ASSERT(isAccelerated());
bool contextLost = !m_surface || m_contextProvider->context3d()->isContextLost();
ASSERT(m_mailboxes.last().m_parentLayerBridge.get() == this);
// Mailboxes are typically released in FIFO order, so we iterate
// from the end of m_mailboxes.
auto releasedMailboxInfo = m_mailboxes.end();
auto firstMailbox = m_mailboxes.begin();
while (true) {
--releasedMailboxInfo;
if (nameEquals(releasedMailboxInfo->m_mailbox, mailbox)) {
break;
}
ASSERT(releasedMailboxInfo != firstMailbox);
}
if (!contextLost) {
// Invalidate texture state in case the compositor altered it since the copy-on-write.
if (releasedMailboxInfo->m_image) {
if (mailbox.validSyncToken) {
context()->waitSyncToken(mailbox.syncToken);
}
GrTexture* texture = releasedMailboxInfo->m_image->getTexture();
if (texture) {
if (lostResource) {
texture->abandon();
} else {
texture->textureParamsModified();
}
}
}
}
RefPtr<Canvas2DLayerBridge> selfRef;
if (m_destructionInProgress) {
// To avoid memory use after free, take a scoped self-reference
// to postpone destruction until the end of this function.
selfRef = this;
}
// The destruction of 'releasedMailboxInfo' will:
// 1) Release the self reference held by the mailboxInfo, which may trigger
// the self-destruction of this Canvas2DLayerBridge
// 2) Release the SkImage, which will return the texture to skia's scratch
// texture pool.
m_mailboxes.remove(releasedMailboxInfo);
}
double ImplicitAnimation::timeToNextService()
{
double t = AnimationBase::timeToNextService();
#if USE(ACCELERATED_COMPOSITING)
if (t != 0 || preActive())
return t;
// A return value of 0 means we need service. But if this is an accelerated animation we
// only need service at the end of the transition.
if (animationOfPropertyIsAccelerated(m_animatingProperty) && isAccelerated()) {
bool isLooping;
getTimeToNextEvent(t, isLooping);
}
#endif
return t;
}
double KeyframeAnimation::timeToNextService()
{
double t = AnimationBase::timeToNextService();
if (t != 0 || preActive())
return t;
// A return value of 0 means we need service. But if we only have accelerated animations we
// only need service at the end of the transition
bool acceleratedPropertiesOnly = true;
for (auto propertyID : m_keyframes.properties()) {
if (!CSSPropertyAnimation::animationOfPropertyIsAccelerated(propertyID) || !isAccelerated()) {
acceleratedPropertiesOnly = false;
break;
}
}
if (acceleratedPropertiesOnly) {
bool isLooping;
getTimeToNextEvent(t, isLooping);
}
return t;
}
bool Canvas2DLayerBridge::prepareMailbox(WebExternalTextureMailbox* outMailbox, WebExternalBitmap* bitmap)
{
ASSERT(isAccelerated());
if (m_destructionInProgress) {
// It can be hit in the following sequence.
// 1. Canvas draws something.
// 2. The compositor begins the frame.
// 3. Javascript makes a context be lost.
// 4. Here.
return false;
}
if (bitmap) {
// Using accelerated 2d canvas with software renderer, which
// should only happen in tests that use fake graphics contexts
// or in Android WebView in software mode. In this case, we do
// not care about producing any results for this canvas.
skipQueuedDrawCommands();
m_lastImageId = 0;
return false;
}
if (!checkSurfaceValid())
return false;
WebGraphicsContext3D* webContext = context();
RefPtr<SkImage> image = newImageSnapshot(PreferAcceleration);
// Early exit if canvas was not drawn to since last prepareMailbox
GLenum filter = m_filterQuality == kNone_SkFilterQuality ? GL_NEAREST : GL_LINEAR;
if (image->uniqueID() == m_lastImageId && filter == m_lastFilter)
return false;
m_lastImageId = image->uniqueID();
m_lastFilter = filter;
{
MailboxInfo tmp;
tmp.m_image = image;
tmp.m_parentLayerBridge = this;
m_mailboxes.prepend(tmp);
}
MailboxInfo& mailboxInfo = m_mailboxes.first();
mailboxInfo.m_mailbox.nearestNeighbor = filter == GL_NEAREST;
GrContext* grContext = m_contextProvider->grContext();
if (!grContext)
return true; // for testing: skip gl stuff when using a mock graphics context.
// Need to flush skia's internal queue because texture is about to be accessed directly
grContext->flush();
ASSERT(image->getTexture());
// Because of texture sharing with the compositor, we must invalidate
// the state cached in skia so that the deferred copy on write
// in SkSurface_Gpu does not make any false assumptions.
mailboxInfo.m_image->getTexture()->textureParamsModified();
webContext->bindTexture(GL_TEXTURE_2D, mailboxInfo.m_image->getTexture()->getTextureHandle());
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
webContext->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Re-use the texture's existing mailbox, if there is one.
if (image->getTexture()->getCustomData()) {
ASSERT(image->getTexture()->getCustomData()->size() == sizeof(mailboxInfo.m_mailbox.name));
memcpy(&mailboxInfo.m_mailbox.name[0], image->getTexture()->getCustomData()->data(), sizeof(mailboxInfo.m_mailbox.name));
} else {
context()->genMailboxCHROMIUM(mailboxInfo.m_mailbox.name);
RefPtr<SkData> mailboxNameData = adoptRef(SkData::NewWithCopy(&mailboxInfo.m_mailbox.name[0], sizeof(mailboxInfo.m_mailbox.name)));
image->getTexture()->setCustomData(mailboxNameData.get());
webContext->produceTextureCHROMIUM(GL_TEXTURE_2D, mailboxInfo.m_mailbox.name);
}
if (isHidden()) {
// With hidden canvases, we release the SkImage immediately because
// there is no need for animations to be double buffered.
mailboxInfo.m_image.clear();
} else {
// FIXME: We'd rather insert a syncpoint than perform a flush here,
// but currentlythe canvas will flicker if we don't flush here.
webContext->flush();
// mailboxInfo.m_mailbox.syncPoint = webContext->insertSyncPoint();
}
webContext->bindTexture(GL_TEXTURE_2D, 0);
// Because we are changing the texture binding without going through skia,
// we must dirty the context.
grContext->resetContext(kTextureBinding_GrGLBackendState);
*outMailbox = mailboxInfo.m_mailbox;
return true;
}
void CanvasRenderingContext2D::drawTextInternal(
const String& text,
double x,
double y,
CanvasRenderingContext2DState::PaintType paintType,
double* maxWidth) {
// The style resolution required for fonts is not available in frame-less
// documents.
if (!canvas()->document().frame())
return;
// accessFont needs the style to be up to date, but updating style can cause
// script to run, (e.g. due to autofocus) which can free the canvas (set size
// to 0, for example), so update style before grabbing the drawingCanvas.
canvas()->document().updateStyleAndLayoutTreeForNode(canvas());
SkCanvas* c = drawingCanvas();
if (!c)
return;
if (!std::isfinite(x) || !std::isfinite(y))
return;
if (maxWidth && (!std::isfinite(*maxWidth) || *maxWidth <= 0))
return;
// Currently, SkPictureImageFilter does not support subpixel text
// anti-aliasing, which is expected when !creationAttributes().alpha(), so we
// need to fall out of display list mode when drawing text to an opaque
// canvas. crbug.com/583809
if (!creationAttributes().alpha() && !isAccelerated())
canvas()->disableDeferral(
DisableDeferralReasonSubPixelTextAntiAliasingSupport);
const Font& font = accessFont();
font.getFontDescription().setSubpixelAscentDescent(true);
const SimpleFontData* fontData = font.primaryFont();
DCHECK(fontData);
if (!fontData)
return;
const FontMetrics& fontMetrics = fontData->getFontMetrics();
// FIXME: Need to turn off font smoothing.
const ComputedStyle* computedStyle = 0;
TextDirection direction =
toTextDirection(state().getDirection(), canvas(), &computedStyle);
bool isRTL = direction == RTL;
bool override =
computedStyle ? isOverride(computedStyle->unicodeBidi()) : false;
TextRun textRun(text, 0, 0, TextRun::AllowTrailingExpansion, direction,
override);
textRun.setNormalizeSpace(true);
// Draw the item text at the correct point.
FloatPoint location(x, y + getFontBaseline(fontMetrics));
double fontWidth = font.width(textRun);
bool useMaxWidth = (maxWidth && *maxWidth < fontWidth);
double width = useMaxWidth ? *maxWidth : fontWidth;
TextAlign align = state().getTextAlign();
if (align == StartTextAlign)
align = isRTL ? RightTextAlign : LeftTextAlign;
else if (align == EndTextAlign)
align = isRTL ? LeftTextAlign : RightTextAlign;
switch (align) {
case CenterTextAlign:
location.setX(location.x() - width / 2);
break;
case RightTextAlign:
location.setX(location.x() - width);
break;
default:
break;
}
// The slop built in to this mask rect matches the heuristic used in
// FontCGWin.cpp for GDI text.
TextRunPaintInfo textRunPaintInfo(textRun);
textRunPaintInfo.bounds =
FloatRect(location.x() - fontMetrics.height() / 2,
location.y() - fontMetrics.ascent() - fontMetrics.lineGap(),
width + fontMetrics.height(), fontMetrics.lineSpacing());
if (paintType == CanvasRenderingContext2DState::StrokePaintType)
inflateStrokeRect(textRunPaintInfo.bounds);
CanvasRenderingContext2DAutoRestoreSkCanvas stateRestorer(this);
if (useMaxWidth) {
drawingCanvas()->save();
drawingCanvas()->translate(location.x(), location.y());
// We draw when fontWidth is 0 so compositing operations (eg, a "copy" op)
// still work.
drawingCanvas()->scale((fontWidth > 0 ? (width / fontWidth) : 0), 1);
location = FloatPoint();
}
draw(
[&font, this, &textRunPaintInfo, &location](
SkCanvas* c, const SkPaint* paint) // draw lambda
{
font.drawBidiText(c, textRunPaintInfo, location,
Font::UseFallbackIfFontNotReady, cDeviceScaleFactor,
*paint);
},
[](const SkIRect& rect) // overdraw test lambda
{ return false; },
textRunPaintInfo.bounds, paintType);
}