Optimized repaint clip for ripple animation from history view reply.

Author: 23rd

Telegram/SourceFiles/history/view/history_view_element.cpp

@@ -1247,8 +1247,8 @@ void Element::prepareCustomEmojiPaint(
 	}
 }
 
-void Element::repaint() const {
-	history()->owner().requestViewRepaint(this);
+void Element::repaint(QRect r) const {
+	history()->owner().requestViewRepaint(this, r);
 }
 
 void Element::paintHighlight(

Telegram/SourceFiles/history/view/history_view_element.h

@@ -641,7 +641,7 @@ class Element
 		const Reactions::InlineList &reactions) const;
 	void clearCustomEmojiRepaint() const;
 	void hideSpoilers();
-	void repaint() const;
+	void repaint(QRect r = QRect()) const;
 
 	[[nodiscard]] ClickHandlerPtr fromPhotoLink() const {
 		return fromLink();

Telegram/SourceFiles/history/view/history_view_reply.cpp

@@ -819,9 +819,11 @@ void Reply::paint(
 	}
 
 	if (_ripple.animation) {
+		_ripple.lastPaintedPoint = { x, y };
 		_ripple.animation->paint(p, x, y, w, &rippleColor);
 		if (_ripple.animation->empty()) {
 			_ripple.animation.reset();
+			_ripple.lastPaintedPoint = {};
 		}
 	}
 
@@ -983,7 +985,7 @@ void Reply::createRippleAnimation(
 		Ui::RippleAnimation::RoundRectMask(
 			size,
 			st::messageQuoteStyle.radius),
-		[=] { view->repaint(); });
+		[=] { view->repaint(QRect(_ripple.lastPaintedPoint, size)); });
 }
 
 void Reply::saveRipplePoint(QPoint point) const {

Telegram/SourceFiles/history/view/history_view_reply.h

@@ -139,8 +139,9 @@ class Reply final : public RuntimeComponent<Reply, Element> {
 	mutable PeerData *_externalSender = nullptr;
 	mutable PeerData *_colorPeer = nullptr;
 	mutable struct {
-		mutable std::unique_ptr<Ui::RippleAnimation> animation;
+		std::unique_ptr<Ui::RippleAnimation> animation;
 		QPoint lastPoint;
+		QPoint lastPaintedPoint;
 	} _ripple;
 	mutable Ui::Text::String _name;
 	mutable Ui::Text::String _text;