void
TiledContentHost::Composite(EffectChain& aEffectChain,
float aOpacity,
const gfx::Matrix4x4& aTransform,
const gfx::Point& aOffset,
const gfx::Filter& aFilter,
const gfx::Rect& aClipRect,
const nsIntRegion* aVisibleRegion /* = nullptr */,
TiledLayerProperties* aLayerProperties /* = nullptr */)
{
MOZ_ASSERT(aLayerProperties, "aLayerProperties required for TiledContentHost");
// note that ProcessUploadQueue updates the valid region which is then used by
// the RenderLayerBuffer calls below and then sent back to the layer.
ProcessUploadQueue(&aLayerProperties->mValidRegion, aLayerProperties);
ProcessLowPrecisionUploadQueue();
// Render valid tiles.
nsIntRect visibleRect = aVisibleRegion->GetBounds();
RenderLayerBuffer(mLowPrecisionVideoMemoryTiledBuffer,
mLowPrecisionVideoMemoryTiledBuffer.GetValidRegion(), aEffectChain, aOpacity,
aOffset, aFilter, aClipRect, aLayerProperties->mValidRegion, visibleRect, aTransform);
RenderLayerBuffer(mVideoMemoryTiledBuffer, aLayerProperties->mValidRegion, aEffectChain, aOpacity, aOffset,
aFilter, aClipRect, nsIntRegion(), visibleRect, aTransform);
}
void
TiledContentHost::Composite(LayerComposite* aLayer,
EffectChain& aEffectChain,
float aOpacity,
const gfx::Matrix4x4& aTransform,
const gfx::Filter& aFilter,
const gfx::Rect& aClipRect,
const nsIntRegion* aVisibleRegion /* = nullptr */)
{
MOZ_ASSERT(mCompositor);
// Reduce the opacity of the low-precision buffer to make it a
// little more subtle and less jarring. In particular, text
// rendered at low-resolution and scaled tends to look pretty
// heavy and this helps mitigate that. When we reduce the opacity
// we also make sure to draw the background color behind the
// reduced-opacity tile so that content underneath doesn't show
// through.
// However, in cases where the background is transparent, or the layer
// already has some opacity, we want to skip this behaviour. Otherwise
// we end up changing the expected overall transparency of the content,
// and it just looks wrong.
gfxRGBA backgroundColor(0);
if (aOpacity == 1.0f && gfxPrefs::LowPrecisionOpacity() < 1.0f) {
// Background colors are only stored on scrollable layers. Grab
// the one from the nearest scrollable ancestor layer.
for (LayerMetricsWrapper ancestor(GetLayer(), LayerMetricsWrapper::StartAt::BOTTOM); ancestor; ancestor = ancestor.GetParent()) {
if (ancestor.Metrics().IsScrollable()) {
backgroundColor = ancestor.Metrics().GetBackgroundColor();
break;
}
}
}
float lowPrecisionOpacityReduction =
(aOpacity == 1.0f && backgroundColor.a == 1.0f)
? gfxPrefs::LowPrecisionOpacity() : 1.0f;
nsIntRegion tmpRegion;
const nsIntRegion* renderRegion = aVisibleRegion;
#ifndef MOZ_IGNORE_PAINT_WILL_RESAMPLE
if (PaintWillResample()) {
// If we're resampling, then the texture image will contain exactly the
// entire visible region's bounds, and we should draw it all in one quad
// to avoid unexpected aliasing.
tmpRegion = aVisibleRegion->GetBounds();
renderRegion = &tmpRegion;
}
#endif
// Render the low and high precision buffers.
RenderLayerBuffer(mLowPrecisionTiledBuffer,
lowPrecisionOpacityReduction < 1.0f ? &backgroundColor : nullptr,
aEffectChain, lowPrecisionOpacityReduction * aOpacity,
aFilter, aClipRect, *renderRegion, aTransform);
RenderLayerBuffer(mTiledBuffer, nullptr, aEffectChain, aOpacity, aFilter,
aClipRect, *renderRegion, aTransform);
mLowPrecisionTiledBuffer.ProcessDelayedUnlocks();
mTiledBuffer.ProcessDelayedUnlocks();
}