float
LayerManagerComposite::ComputeRenderIntegrity()
{
// We only ever have incomplete rendering when progressive tiles are enabled.
Layer* root = GetRoot();
if (!gfxPlatform::GetPlatform()->UseProgressivePaint() || !root) {
return 1.f;
}
FrameMetrics rootMetrics = LayerMetricsWrapper::TopmostScrollableMetrics(root);
if (!rootMetrics.IsScrollable()) {
// The root may not have any scrollable metrics, in which case rootMetrics
// will just be an empty FrameMetrics. Instead use the actual metrics from
// the root layer.
rootMetrics = LayerMetricsWrapper(root).Metrics();
}
ParentLayerIntRect bounds = RoundedToInt(rootMetrics.GetCompositionBounds());
IntRect screenRect(bounds.x,
bounds.y,
bounds.width,
bounds.height);
float lowPrecisionMultiplier = 1.0f;
float highPrecisionMultiplier = 1.0f;
#ifdef MOZ_WIDGET_ANDROID
// Use the transform on the primary scrollable layer and its FrameMetrics
// to find out how much of the viewport the current displayport covers
nsTArray<Layer*> rootScrollableLayers;
GetRootScrollableLayers(rootScrollableLayers);
if (rootScrollableLayers.Length() > 0) {
// This is derived from the code in
// AsyncCompositionManager::TransformScrollableLayer
Layer* rootScrollable = rootScrollableLayers[0];
const FrameMetrics& metrics = LayerMetricsWrapper::TopmostScrollableMetrics(rootScrollable);
Matrix4x4 transform = rootScrollable->GetEffectiveTransform();
transform.PostScale(metrics.GetPresShellResolution(), metrics.GetPresShellResolution(), 1);
// Clip the screen rect to the document bounds
Rect documentBounds =
transform.TransformBounds(Rect(metrics.GetScrollableRect().x - metrics.GetScrollOffset().x,
metrics.GetScrollableRect().y - metrics.GetScrollOffset().y,
metrics.GetScrollableRect().width,
metrics.GetScrollableRect().height));
documentBounds.RoundOut();
screenRect = screenRect.Intersect(IntRect(documentBounds.x, documentBounds.y,
documentBounds.width, documentBounds.height));
// If the screen rect is empty, the user has scrolled entirely into
// over-scroll and so we can be considered to have full integrity.
if (screenRect.IsEmpty()) {
return 1.0f;
}
// Work out how much of the critical display-port covers the screen
bool hasLowPrecision = false;
if (!metrics.GetCriticalDisplayPort().IsEmpty()) {
hasLowPrecision = true;
highPrecisionMultiplier =
GetDisplayportCoverage(metrics.GetCriticalDisplayPort(), transform, screenRect);
}
// Work out how much of the display-port covers the screen
if (!metrics.GetDisplayPort().IsEmpty()) {
if (hasLowPrecision) {
lowPrecisionMultiplier =
GetDisplayportCoverage(metrics.GetDisplayPort(), transform, screenRect);
} else {
lowPrecisionMultiplier = highPrecisionMultiplier =
GetDisplayportCoverage(metrics.GetDisplayPort(), transform, screenRect);
}
}
}
// If none of the screen is covered, we have zero integrity.
if (highPrecisionMultiplier <= 0.0f && lowPrecisionMultiplier <= 0.0f) {
return 0.0f;
}
#endif // MOZ_WIDGET_ANDROID
nsIntRegion screenRegion(screenRect);
nsIntRegion lowPrecisionScreenRegion(screenRect);
Matrix4x4 transform;
ComputeRenderIntegrityInternal(root, screenRegion,
lowPrecisionScreenRegion, transform);
if (!screenRegion.IsEqual(screenRect)) {
// Calculate the area of the region. All rects in an nsRegion are
// non-overlapping.
float screenArea = screenRect.width * screenRect.height;
float highPrecisionIntegrity = screenRegion.Area() / screenArea;
float lowPrecisionIntegrity = 1.f;
if (!lowPrecisionScreenRegion.IsEqual(screenRect)) {
lowPrecisionIntegrity = lowPrecisionScreenRegion.Area() / screenArea;
}
return ((highPrecisionIntegrity * highPrecisionMultiplier) +
(lowPrecisionIntegrity * lowPrecisionMultiplier)) / 2;
}
return 1.f;
}
/* static */ void
LayerManagerComposite::ComputeRenderIntegrityInternal(Layer* aLayer,
nsIntRegion& aScreenRegion,
nsIntRegion& aLowPrecisionScreenRegion,
const Matrix4x4& aTransform)
{
if (aLayer->GetOpacity() <= 0.f ||
(aScreenRegion.IsEmpty() && aLowPrecisionScreenRegion.IsEmpty())) {
return;
}
// If the layer's a container, recurse into all of its children
ContainerLayer* container = aLayer->AsContainerLayer();
if (container) {
// Accumulate the transform of intermediate surfaces
Matrix4x4 transform = aTransform;
if (container->UseIntermediateSurface()) {
transform = aLayer->GetEffectiveTransform();
transform = aTransform * transform;
}
for (Layer* child = aLayer->GetFirstChild(); child;
child = child->GetNextSibling()) {
ComputeRenderIntegrityInternal(child, aScreenRegion, aLowPrecisionScreenRegion, transform);
}
return;
}
// Only painted layers can be incomplete
PaintedLayer* paintedLayer = aLayer->AsPaintedLayer();
if (!paintedLayer) {
return;
}
// See if there's any incomplete rendering
nsIntRegion incompleteRegion = aLayer->GetEffectiveVisibleRegion();
incompleteRegion.Sub(incompleteRegion, paintedLayer->GetValidRegion());
if (!incompleteRegion.IsEmpty()) {
// Calculate the transform to get between screen and layer space
Matrix4x4 transformToScreen = aLayer->GetEffectiveTransform();
transformToScreen = aTransform * transformToScreen;
SubtractTransformedRegion(aScreenRegion, incompleteRegion, transformToScreen);
// See if there's any incomplete low-precision rendering
TiledContentHost* composer = nullptr;
LayerComposite* shadow = aLayer->AsLayerComposite();
if (shadow) {
composer = shadow->GetCompositableHost()->AsTiledContentHost();
if (composer) {
incompleteRegion.Sub(incompleteRegion, composer->GetValidLowPrecisionRegion());
if (!incompleteRegion.IsEmpty()) {
SubtractTransformedRegion(aLowPrecisionScreenRegion, incompleteRegion, transformToScreen);
}
}
}
// If we can't get a valid low precision region, assume it's the same as
// the high precision region.
if (!composer) {
SubtractTransformedRegion(aLowPrecisionScreenRegion, incompleteRegion, transformToScreen);
}
}
}
float
LayerManagerComposite::ComputeRenderIntegrity()
{
// We only ever have incomplete rendering when progressive tiles are enabled.
Layer* root = GetRoot();
if (!gfxPrefs::UseProgressiveTilePainting() || !root) {
return 1.f;
}
const FrameMetrics& rootMetrics = root->GetFrameMetrics();
ParentLayerIntRect bounds = RoundedToInt(rootMetrics.mCompositionBounds);
nsIntRect screenRect(bounds.x,
bounds.y,
bounds.width,
bounds.height);
float lowPrecisionMultiplier = 1.0f;
float highPrecisionMultiplier = 1.0f;
#ifdef MOZ_ANDROID_OMTC
// Use the transform on the primary scrollable layer and its FrameMetrics
// to find out how much of the viewport the current displayport covers
Layer* primaryScrollable = GetPrimaryScrollableLayer();
if (primaryScrollable) {
// This is derived from the code in
// AsyncCompositionManager::TransformScrollableLayer
const FrameMetrics& metrics = primaryScrollable->GetFrameMetrics();
Matrix4x4 transform = primaryScrollable->GetEffectiveTransform();
transform.ScalePost(metrics.mResolution.scale, metrics.mResolution.scale, 1);
// Clip the screen rect to the document bounds
Rect documentBounds =
transform.TransformBounds(Rect(metrics.mScrollableRect.x - metrics.GetScrollOffset().x,
metrics.mScrollableRect.y - metrics.GetScrollOffset().y,
metrics.mScrollableRect.width,
metrics.mScrollableRect.height));
documentBounds.RoundOut();
screenRect = screenRect.Intersect(nsIntRect(documentBounds.x, documentBounds.y,
documentBounds.width, documentBounds.height));
// If the screen rect is empty, the user has scrolled entirely into
// over-scroll and so we can be considered to have full integrity.
if (screenRect.IsEmpty()) {
return 1.0f;
}
// Work out how much of the critical display-port covers the screen
bool hasLowPrecision = false;
if (!metrics.mCriticalDisplayPort.IsEmpty()) {
hasLowPrecision = true;
highPrecisionMultiplier =
GetDisplayportCoverage(metrics.mCriticalDisplayPort, transform, screenRect);
}
// Work out how much of the display-port covers the screen
if (!metrics.mDisplayPort.IsEmpty()) {
if (hasLowPrecision) {
lowPrecisionMultiplier =
GetDisplayportCoverage(metrics.mDisplayPort, transform, screenRect);
} else {
lowPrecisionMultiplier = highPrecisionMultiplier =
GetDisplayportCoverage(metrics.mDisplayPort, transform, screenRect);
}
}
}
// If none of the screen is covered, we have zero integrity.
if (highPrecisionMultiplier <= 0.0f && lowPrecisionMultiplier <= 0.0f) {
return 0.0f;
}
#endif // MOZ_ANDROID_OMTC
nsIntRegion screenRegion(screenRect);
nsIntRegion lowPrecisionScreenRegion(screenRect);
Matrix4x4 transform;
ComputeRenderIntegrityInternal(root, screenRegion,
lowPrecisionScreenRegion, transform);
if (!screenRegion.IsEqual(screenRect)) {
// Calculate the area of the region. All rects in an nsRegion are
// non-overlapping.
float screenArea = screenRect.width * screenRect.height;
float highPrecisionIntegrity = screenRegion.Area() / screenArea;
float lowPrecisionIntegrity = 1.f;
if (!lowPrecisionScreenRegion.IsEqual(screenRect)) {
lowPrecisionIntegrity = lowPrecisionScreenRegion.Area() / screenArea;
}
return ((highPrecisionIntegrity * highPrecisionMultiplier) +
(lowPrecisionIntegrity * lowPrecisionMultiplier)) / 2;
}
return 1.f;
}
