bool
ClientTiledThebesLayer::RenderLowPrecision(nsIntRegion& aInvalidRegion,
const nsIntRegion& aVisibleRegion,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData)
{
// Render the low precision buffer, if the visible region is larger than the
// critical display port.
if (!nsIntRegion(LayerIntRect::ToUntyped(mPaintData.mCriticalDisplayPort)).Contains(aVisibleRegion)) {
nsIntRegion oldValidRegion = mContentClient->mLowPrecisionTiledBuffer.GetValidRegion();
oldValidRegion.And(oldValidRegion, aVisibleRegion);
bool updatedBuffer = false;
// If the frame resolution or format have changed, invalidate the buffer
if (mContentClient->mLowPrecisionTiledBuffer.GetFrameResolution() != mPaintData.mResolution ||
mContentClient->mLowPrecisionTiledBuffer.HasFormatChanged()) {
if (!mLowPrecisionValidRegion.IsEmpty()) {
updatedBuffer = true;
}
oldValidRegion.SetEmpty();
mLowPrecisionValidRegion.SetEmpty();
mContentClient->mLowPrecisionTiledBuffer.SetFrameResolution(mPaintData.mResolution);
aInvalidRegion = aVisibleRegion;
}
// Invalidate previously valid content that is no longer visible
if (mPaintData.mLowPrecisionPaintCount == 1) {
mLowPrecisionValidRegion.And(mLowPrecisionValidRegion, aVisibleRegion);
}
mPaintData.mLowPrecisionPaintCount++;
// Remove the valid high-precision region from the invalid low-precision
// region. We don't want to spend time drawing things twice.
aInvalidRegion.Sub(aInvalidRegion, mValidRegion);
TILING_LOG("TILING %p: Progressive paint: low-precision invalid region is %s\n", this, Stringify(aInvalidRegion).c_str());
TILING_LOG("TILING %p: Progressive paint: low-precision old valid region is %s\n", this, Stringify(oldValidRegion).c_str());
if (!aInvalidRegion.IsEmpty()) {
updatedBuffer = mContentClient->mLowPrecisionTiledBuffer.ProgressiveUpdate(
mLowPrecisionValidRegion, aInvalidRegion, oldValidRegion,
&mPaintData, aCallback, aCallbackData);
}
TILING_LOG("TILING %p: Progressive paint: low-precision new valid region is %s\n", this, Stringify(mLowPrecisionValidRegion).c_str());
return updatedBuffer;
}
if (!mLowPrecisionValidRegion.IsEmpty()) {
TILING_LOG("TILING %p: Clearing low-precision buffer\n", this);
// Clear the low precision tiled buffer.
mLowPrecisionValidRegion.SetEmpty();
mContentClient->mLowPrecisionTiledBuffer.ResetPaintedAndValidState();
// Return true here so we send a Painted callback after clearing the valid
// region of the low precision buffer. This allows the shadow buffer's valid
// region to be updated and the associated resources to be freed.
return true;
}
return false;
}
bool
ClientTiledLayerBuffer::ProgressiveUpdate(nsIntRegion& aValidRegion,
nsIntRegion& aInvalidRegion,
const nsIntRegion& aOldValidRegion,
BasicTiledLayerPaintData* aPaintData,
LayerManager::DrawThebesLayerCallback aCallback,
void* aCallbackData)
{
bool repeat = false;
bool isBufferChanged = false;
do {
// Compute the region that should be updated. Repeat as many times as
// is required.
nsIntRegion regionToPaint;
repeat = ComputeProgressiveUpdateRegion(aInvalidRegion,
aOldValidRegion,
regionToPaint,
aPaintData,
repeat);
// There's no further work to be done.
if (regionToPaint.IsEmpty()) {
break;
}
isBufferChanged = true;
// Keep track of what we're about to refresh.
aValidRegion.Or(aValidRegion, regionToPaint);
// aValidRegion may have been altered by InvalidateRegion, but we still
// want to display stale content until it gets progressively updated.
// Create a region that includes stale content.
nsIntRegion validOrStale;
validOrStale.Or(aValidRegion, aOldValidRegion);
// Paint the computed region and subtract it from the invalid region.
PaintThebes(validOrStale, regionToPaint, aCallback, aCallbackData);
aInvalidRegion.Sub(aInvalidRegion, regionToPaint);
} while (repeat);
// Return false if nothing has been drawn, or give what has been drawn
// to the shadow layer to upload.
return isBufferChanged;
}
static void
SubtractTransformedRegion(nsIntRegion& aRegion,
const nsIntRegion& aRegionToSubtract,
const Matrix4x4& aTransform)
{
if (aRegionToSubtract.IsEmpty()) {
return;
}
// For each rect in the region, find out its bounds in screen space and
// subtract it from the screen region.
nsIntRegionRectIterator it(aRegionToSubtract);
while (const IntRect* rect = it.Next()) {
Rect incompleteRect = aTransform.TransformBounds(ToRect(*rect));
aRegion.Sub(aRegion, IntRect(incompleteRect.x,
incompleteRect.y,
incompleteRect.width,
incompleteRect.height));
}
}