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Direct2D: Fix performance issue when drawing transformed unclipped regions

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This issue could be observed in the GraphicsDemo's SVG pane, when the
"rotation" option was enabled.

Drawables internally enable the unclipped painting flag, which normally
prevents slow clipping when drawing subcomponents of the drawable.

The Direct2D graphics context was using the frame area as the default
area, used to signal that no clipping should be applied. However, when
non-axis-aligned transform was active, this area was incorrectly applied
as a geometric clipping region. D2D geometric clips are relatively slow,
so this caused large slowdowns.

This solution adds a flag that is set whenever a clip is explicitly
requested. If no clip is explicitly requested, then clipping will be
entirely bypassed. This can make rendering of Drawables significantly
faster.
This commit is contained in:
reuk 2024-12-11 21:42:35 +00:00
parent 336dcfc08c
commit f887979ec0
2 changed files with 25 additions and 5 deletions
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9
modules/juce_graphics/native/juce_Direct2DGraphicsContext_windows.cpp
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@ -1070,21 +1070,24 @@ void Direct2DGraphicsContext::resetPendingClipList()
void Direct2DGraphicsContext::applyPendingClipList()
{
if (! pendingClipList.isClipApplied())
return;
auto& transform = currentState->currentTransform;
bool const axisAligned = currentState->isCurrentTransformAxisAligned();
const auto axisAligned = currentState->isCurrentTransformAxisAligned();
const auto list = pendingClipList.getList();
// Clip if the pending clip list is not empty and smaller than the frame size
if (! list.containsRectangle (getPimpl()->getFrameSize().toFloat()) && ! list.isEmpty())
{
if (list.getNumRectangles() == 1 && (transform.isOnlyTranslated || axisAligned))
if (list.getNumRectangles() == 1 && axisAligned)
{
auto r = list.getRectangle (0);
currentState->pushAliasedAxisAlignedClipLayer (r);
}
else
{
auto clipTransform = transform.isOnlyTranslated || axisAligned ? AffineTransform{} : transform.getTransform();
auto clipTransform = axisAligned ? AffineTransform{} : transform.getTransform();
if (auto clipGeometry = D2DHelpers::rectListToPathGeometry (getPimpl()->getDirect2DFactory(),
list,
clipTransform,