void
APZCCallbackHelper::UpdateRootFrame(nsIDOMWindowUtils* aUtils,
FrameMetrics& aMetrics)
{
// Precondition checks
MOZ_ASSERT(aUtils);
if (aMetrics.mScrollId == FrameMetrics::NULL_SCROLL_ID) {
return;
}
// Set the scroll port size, which determines the scroll range. For example if
// a 500-pixel document is shown in a 100-pixel frame, the scroll port length would
// be 100, and gecko would limit the maximum scroll offset to 400 (so as to prevent
// overscroll). Note that if the content here was zoomed to 2x, the document would
// be 1000 pixels long but the frame would still be 100 pixels, and so the maximum
// scroll range would be 900. Therefore this calculation depends on the zoom applied
// to the content relative to the container.
CSSSize scrollPort = aMetrics.CalculateCompositedRectInCssPixels().Size();
aUtils->SetScrollPositionClampingScrollPortSize(scrollPort.width, scrollPort.height);
// Scroll the window to the desired spot
nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.mScrollId);
CSSPoint actualScrollOffset = ScrollFrameTo(sf, aMetrics.mScrollOffset);
// Correct the display port due to the difference between mScrollOffset and the
// actual scroll offset, possibly align it to tile boundaries (if tiled layers are
// enabled), and clamp it to the scrollable rect.
MaybeAlignAndClampDisplayPort(aMetrics, actualScrollOffset);
aMetrics.mScrollOffset = actualScrollOffset;
// The mZoom variable on the frame metrics stores the CSS-to-screen scale for this
// frame. This scale includes all of the (cumulative) resolutions set on the presShells
// from the root down to this frame. However, when setting the resolution, we only
// want the piece of the resolution that corresponds to this presShell, rather than
// all of the cumulative stuff, so we need to divide out the parent resolutions.
// Finally, we multiply by a ScreenToLayerScale of 1.0f because the goal here is to
// take the async zoom calculated by the APZC and tell gecko about it (turning it into
// a "sync" zoom) which will update the resolution at which the layer is painted.
mozilla::layers::ParentLayerToLayerScale presShellResolution =
aMetrics.mZoom
/ aMetrics.mDevPixelsPerCSSPixel
/ aMetrics.GetParentResolution()
* ScreenToLayerScale(1.0f);
aUtils->SetResolution(presShellResolution.scale, presShellResolution.scale);
// Finally, we set the displayport.
nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(aMetrics.mScrollId);
if (!content) {
return;
}
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(content);
if (!element) {
return;
}
aUtils->SetDisplayPortForElement(aMetrics.mDisplayPort.x,
aMetrics.mDisplayPort.y,
aMetrics.mDisplayPort.width,
aMetrics.mDisplayPort.height,
element);
}
template<class ContainerT> void
ContainerRender(ContainerT* aContainer,
LayerManagerComposite* aManager,
const nsIntRect& aClipRect)
{
/**
* Setup our temporary surface for rendering the contents of this container.
*/
RefPtr<CompositingRenderTarget> surface;
Compositor* compositor = aManager->GetCompositor();
RefPtr<CompositingRenderTarget> previousTarget = compositor->GetCurrentRenderTarget();
nsIntRect visibleRect = aContainer->GetEffectiveVisibleRegion().GetBounds();
aContainer->mSupportsComponentAlphaChildren = false;
float opacity = aContainer->GetEffectiveOpacity();
bool needsSurface = aContainer->UseIntermediateSurface();
if (needsSurface) {
SurfaceInitMode mode = INIT_MODE_CLEAR;
bool surfaceCopyNeeded = false;
gfx::IntRect surfaceRect = gfx::IntRect(visibleRect.x, visibleRect.y,
visibleRect.width, visibleRect.height);
gfx::IntPoint sourcePoint = gfx::IntPoint(visibleRect.x, visibleRect.y);
// we're about to create a framebuffer backed by textures to use as an intermediate
// surface. What to do if its size (as given by framebufferRect) would exceed the
// maximum texture size supported by the GL? The present code chooses the compromise
// of just clamping the framebuffer's size to the max supported size.
// This gives us a lower resolution rendering of the intermediate surface (children layers).
// See bug 827170 for a discussion.
int32_t maxTextureSize = compositor->GetMaxTextureSize();
surfaceRect.width = std::min(maxTextureSize, surfaceRect.width);
surfaceRect.height = std::min(maxTextureSize, surfaceRect.height);
if (aContainer->GetEffectiveVisibleRegion().GetNumRects() == 1 &&
(aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE))
{
// don't need a background, we're going to paint all opaque stuff
aContainer->mSupportsComponentAlphaChildren = true;
mode = INIT_MODE_NONE;
} else {
const gfx3DMatrix& transform3D = aContainer->GetEffectiveTransform();
gfxMatrix transform;
// If we have an opaque ancestor layer, then we can be sure that
// all the pixels we draw into are either opaque already or will be
// covered by something opaque. Otherwise copying up the background is
// not safe.
if (HasOpaqueAncestorLayer(aContainer) &&
transform3D.Is2D(&transform) && !transform.HasNonIntegerTranslation()) {
surfaceCopyNeeded = gfxPlatform::ComponentAlphaEnabled();
sourcePoint.x += transform.x0;
sourcePoint.y += transform.y0;
aContainer->mSupportsComponentAlphaChildren
= gfxPlatform::ComponentAlphaEnabled();
}
}
sourcePoint -= compositor->GetCurrentRenderTarget()->GetOrigin();
if (surfaceCopyNeeded) {
surface = compositor->CreateRenderTargetFromSource(surfaceRect, previousTarget, sourcePoint);
} else {
surface = compositor->CreateRenderTarget(surfaceRect, mode);
}
if (!surface) {
return;
}
compositor->SetRenderTarget(surface);
} else {
surface = previousTarget;
aContainer->mSupportsComponentAlphaChildren = (aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE) ||
(aContainer->GetParent() && aContainer->GetParent()->SupportsComponentAlphaChildren());
}
nsAutoTArray<Layer*, 12> children;
aContainer->SortChildrenBy3DZOrder(children);
/**
* Render this container's contents.
*/
for (uint32_t i = 0; i < children.Length(); i++) {
LayerComposite* layerToRender = static_cast<LayerComposite*>(children.ElementAt(i)->ImplData());
if (layerToRender->GetLayer()->GetEffectiveVisibleRegion().IsEmpty() &&
!layerToRender->GetLayer()->AsContainerLayer()) {
continue;
}
if (i + 1 < children.Length() &&
layerToRender->GetLayer()->GetEffectiveTransform().IsIdentity()) {
LayerComposite* nextLayer = static_cast<LayerComposite*>(children.ElementAt(i + 1)->ImplData());
nsIntRect nextLayerOpaqueRect;
if (nextLayer && nextLayer->GetLayer()) {
nextLayerOpaqueRect = GetOpaqueRect(nextLayer->GetLayer());
}
if (!nextLayerOpaqueRect.IsEmpty()) {
nsIntRegion visibleRegion;
visibleRegion.Sub(layerToRender->GetShadowVisibleRegion(), nextLayerOpaqueRect);
layerToRender->SetShadowVisibleRegion(visibleRegion);
if (visibleRegion.IsEmpty()) {
continue;
}
}
}
nsIntRect clipRect = layerToRender->GetLayer()->
CalculateScissorRect(aClipRect, &aManager->GetWorldTransform());
if (clipRect.IsEmpty()) {
continue;
}
if (layerToRender->HasLayerBeenComposited()) {
// Composer2D will compose this layer so skip GPU composition
// this time & reset composition flag for next composition phase
layerToRender->SetLayerComposited(false);
} else {
layerToRender->RenderLayer(clipRect);
}
// invariant: our GL context should be current here, I don't think we can
// assert it though
}
if (needsSurface) {
// Unbind the current surface and rebind the previous one.
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPainting) {
nsRefPtr<gfxImageSurface> surf = surface->Dump(aManager->GetCompositor());
WriteSnapshotToDumpFile(aContainer, surf);
}
#endif
compositor->SetRenderTarget(previousTarget);
EffectChain effectChain;
LayerManagerComposite::AutoAddMaskEffect autoMaskEffect(aContainer->GetMaskLayer(),
effectChain,
!aContainer->GetTransform().CanDraw2D());
effectChain.mPrimaryEffect = new EffectRenderTarget(surface);
gfx::Matrix4x4 transform;
ToMatrix4x4(aContainer->GetEffectiveTransform(), transform);
gfx::Rect rect(visibleRect.x, visibleRect.y, visibleRect.width, visibleRect.height);
gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
aManager->GetCompositor()->DrawQuad(rect, clipRect, effectChain, opacity,
transform);
}
if (aContainer->GetFrameMetrics().IsScrollable()) {
gfx::Matrix4x4 transform;
ToMatrix4x4(aContainer->GetEffectiveTransform(), transform);
const FrameMetrics& frame = aContainer->GetFrameMetrics();
LayerRect layerBounds = ScreenRect(frame.mCompositionBounds) * ScreenToLayerScale(1.0);
gfx::Rect rect(layerBounds.x, layerBounds.y, layerBounds.width, layerBounds.height);
gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
aManager->GetCompositor()->DrawDiagnostics(DIAGNOSTIC_CONTAINER,
rect, clipRect,
transform);
}
}
void
APZCCallbackHelper::UpdateRootFrame(nsIDOMWindowUtils* aUtils,
FrameMetrics& aMetrics)
{
// Precondition checks
MOZ_ASSERT(aUtils);
MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());
if (aMetrics.GetScrollId() == FrameMetrics::NULL_SCROLL_ID) {
return;
}
// Set the scroll port size, which determines the scroll range. For example if
// a 500-pixel document is shown in a 100-pixel frame, the scroll port length would
// be 100, and gecko would limit the maximum scroll offset to 400 (so as to prevent
// overscroll). Note that if the content here was zoomed to 2x, the document would
// be 1000 pixels long but the frame would still be 100 pixels, and so the maximum
// scroll range would be 900. Therefore this calculation depends on the zoom applied
// to the content relative to the container.
CSSSize scrollPort = aMetrics.CalculateCompositedSizeInCssPixels();
aUtils->SetScrollPositionClampingScrollPortSize(scrollPort.width, scrollPort.height);
// Scroll the window to the desired spot
nsIScrollableFrame* sf = nsLayoutUtils::FindScrollableFrameFor(aMetrics.GetScrollId());
bool scrollUpdated = false;
CSSPoint actualScrollOffset = ScrollFrameTo(sf, aMetrics.GetScrollOffset(), scrollUpdated);
if (scrollUpdated) {
// Correct the display port due to the difference between mScrollOffset and the
// actual scroll offset.
AdjustDisplayPortForScrollDelta(aMetrics, actualScrollOffset);
} else {
// For whatever reason we couldn't update the scroll offset on the scroll frame,
// which means the data APZ used for its displayport calculation is stale. Fall
// back to a sane default behaviour. Note that we don't tile-align the recentered
// displayport because tile-alignment depends on the scroll position, and the
// scroll position here is out of our control. See bug 966507 comment 21 for a
// more detailed explanation.
RecenterDisplayPort(aMetrics);
}
aMetrics.SetScrollOffset(actualScrollOffset);
// The mZoom variable on the frame metrics stores the CSS-to-screen scale for this
// frame. This scale includes all of the (cumulative) resolutions set on the presShells
// from the root down to this frame. However, when setting the resolution, we only
// want the piece of the resolution that corresponds to this presShell, rather than
// all of the cumulative stuff, so we need to divide out the parent resolutions.
// Finally, we multiply by a ScreenToLayerScale of 1.0f because the goal here is to
// take the async zoom calculated by the APZC and tell gecko about it (turning it into
// a "sync" zoom) which will update the resolution at which the layer is painted.
ParentLayerToLayerScale presShellResolution =
aMetrics.GetZoom()
/ aMetrics.mDevPixelsPerCSSPixel
/ aMetrics.GetParentResolution()
* ScreenToLayerScale(1.0f);
aUtils->SetResolution(presShellResolution.scale, presShellResolution.scale);
// Finally, we set the displayport.
nsCOMPtr<nsIContent> content = nsLayoutUtils::FindContentFor(aMetrics.GetScrollId());
if (!content) {
return;
}
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(content);
if (!element) {
return;
}
gfx::IntSize alignment = gfxPrefs::LayersTilesEnabled()
? gfx::IntSize(gfxPrefs::LayersTileWidth(), gfxPrefs::LayersTileHeight()) :
gfx::IntSize(0, 0);
LayerMargin margins = aMetrics.GetDisplayPortMargins();
aUtils->SetDisplayPortMarginsForElement(margins.left,
margins.top,
margins.right,
margins.bottom,
alignment.width,
alignment.height,
element, 0);
CSSRect baseCSS = aMetrics.CalculateCompositedRectInCssPixels();
nsRect base(baseCSS.x * nsPresContext::AppUnitsPerCSSPixel(),
baseCSS.y * nsPresContext::AppUnitsPerCSSPixel(),
baseCSS.width * nsPresContext::AppUnitsPerCSSPixel(),
baseCSS.height * nsPresContext::AppUnitsPerCSSPixel());
nsLayoutUtils::SetDisplayPortBaseIfNotSet(content, base);
}