bool DrawingDisplayItem::equals(const DisplayItem& other) const
{
if (!DisplayItem::equals(other))
return false;
RefPtr<const SkPicture> picture = this->picture();
RefPtr<const SkPicture> otherPicture = static_cast<const DrawingDisplayItem&>(other).picture();
if (!picture && !otherPicture)
return true;
if (!picture || !otherPicture)
return false;
switch (getUnderInvalidationCheckingMode()) {
case DrawingDisplayItem::CheckPicture: {
if (picture->approximateOpCount() != otherPicture->approximateOpCount())
return false;
SkDynamicMemoryWStream pictureSerialized;
picture->serialize(&pictureSerialized);
SkDynamicMemoryWStream otherPictureSerialized;
otherPicture->serialize(&otherPictureSerialized);
if (pictureSerialized.bytesWritten() != otherPictureSerialized.bytesWritten())
return false;
RefPtr<SkData> oldData = adoptRef(otherPictureSerialized.copyToData());
RefPtr<SkData> newData = adoptRef(pictureSerialized.copyToData());
return oldData->equals(newData.get());
}
case DrawingDisplayItem::CheckBitmap: {
SkRect rect = picture->cullRect();
if (rect != otherPicture->cullRect())
return false;
SkBitmap bitmap;
bitmap.allocPixels(SkImageInfo::MakeN32Premul(rect.width(), rect.height()));
SkCanvas canvas(bitmap);
canvas.translate(-rect.x(), -rect.y());
canvas.drawPicture(otherPicture.get());
SkPaint diffPaint;
diffPaint.setXfermodeMode(SkXfermode::kDifference_Mode);
canvas.drawPicture(picture.get(), nullptr, &diffPaint);
return bitmapIsAllZero(bitmap);
}
default:
ASSERT_NOT_REACHED();
}
return false;
}
void DisplayItemList::checkCachedDisplayItemIsUnchanged(const DisplayItem& displayItem, DisplayItemIndicesByClientMap& displayItemIndicesByClient)
{
ASSERT(RuntimeEnabledFeatures::slimmingPaintUnderInvalidationCheckingEnabled());
if (!displayItem.isDrawing() || displayItem.skippedCache() || !clientCacheIsValid(displayItem.client()))
return;
// If checking under-invalidation, we always generate new display item even if the client is not invalidated.
// Checks if the new picture is the same as the cached old picture. If the new picture is different but
// the client is not invalidated, issue error about under-invalidation.
size_t index = findMatchingItemFromIndex(displayItem.nonCachedId(), displayItemIndicesByClient, m_currentDisplayItems);
if (index == kNotFound) {
showUnderInvalidationError("ERROR: under-invalidation: no cached display item", displayItem);
ASSERT_NOT_REACHED();
return;
}
DisplayItems::iterator foundItem = m_currentDisplayItems.begin() + index;
RefPtr<const SkPicture> newPicture = static_cast<const DrawingDisplayItem&>(displayItem).picture();
RefPtr<const SkPicture> oldPicture = static_cast<const DrawingDisplayItem&>(*foundItem).picture();
// Invalidate the display item so that we can check if there are any remaining cached display items after merging.
foundItem->clearClientForUnderInvalidationChecking();
if (!newPicture && !oldPicture)
return;
if (newPicture && oldPicture) {
switch (static_cast<const DrawingDisplayItem&>(displayItem).underInvalidationCheckingMode()) {
case DrawingDisplayItem::CheckPicture:
if (newPicture->approximateOpCount() == oldPicture->approximateOpCount()) {
SkDynamicMemoryWStream newPictureSerialized;
newPicture->serialize(&newPictureSerialized);
SkDynamicMemoryWStream oldPictureSerialized;
oldPicture->serialize(&oldPictureSerialized);
if (newPictureSerialized.bytesWritten() == oldPictureSerialized.bytesWritten()) {
RefPtr<SkData> oldData = adoptRef(oldPictureSerialized.copyToData());
RefPtr<SkData> newData = adoptRef(newPictureSerialized.copyToData());
if (oldData->equals(newData.get()))
return;
}
}
break;
case DrawingDisplayItem::CheckBitmap:
if (newPicture->cullRect() == oldPicture->cullRect()) {
SkBitmap bitmap;
SkRect rect = newPicture->cullRect();
bitmap.allocPixels(SkImageInfo::MakeN32Premul(rect.width(), rect.height()));
SkCanvas canvas(bitmap);
canvas.translate(-rect.x(), -rect.y());
canvas.drawPicture(oldPicture.get());
SkPaint diffPaint;
diffPaint.setXfermodeMode(SkXfermode::kDifference_Mode);
canvas.drawPicture(newPicture.get(), nullptr, &diffPaint);
if (bitmapIsAllZero(bitmap)) // Contents are the same.
return;
}
default:
ASSERT_NOT_REACHED();
}
}
showUnderInvalidationError("ERROR: under-invalidation: display item changed", displayItem);
#ifndef NDEBUG
String oldPictureDebugString = oldPicture ? pictureAsDebugString(oldPicture.get()) : "None";
String newPictureDebugString = newPicture ? pictureAsDebugString(newPicture.get()) : "None";
WTFLogAlways("old picture:\n%s\n", oldPictureDebugString.utf8().data());
WTFLogAlways("new picture:\n%s\n", newPictureDebugString.utf8().data());
#endif // NDEBUG
ASSERT_NOT_REACHED();
}