From 7c8ada0e78fb660d226dbe824191cd387f331868 Mon Sep 17 00:00:00 2001
From: 23rd <23rd@vivaldi.net>
Date: Tue, 31 Jan 2023 22:49:10 +0300
Subject: [PATCH] Slightly improved shadows for bubble wraps in userpic emoji
 builder.

---
 .../info/userpic/info_userpic_bubble_wrap.cpp | 67 +++++++++++++------
 1 file changed, 46 insertions(+), 21 deletions(-)

diff --git a/Telegram/SourceFiles/info/userpic/info_userpic_bubble_wrap.cpp b/Telegram/SourceFiles/info/userpic/info_userpic_bubble_wrap.cpp
index 282d080402..e04981b4b3 100644
--- a/Telegram/SourceFiles/info/userpic/info_userpic_bubble_wrap.cpp
+++ b/Telegram/SourceFiles/info/userpic/info_userpic_bubble_wrap.cpp
@@ -7,13 +7,39 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "info/userpic/info_userpic_bubble_wrap.h"
 
-#include "ui/chat/message_bubble.h"
+#include "ui/painter.h"
 #include "ui/rect.h"
 #include "ui/wrap/padding_wrap.h"
 #include "ui/wrap/vertical_layout.h"
+#include "styles/style_chat.h"
 #include "styles/style_info_userpic_builder.h"
 
 namespace Ui {
+namespace {
+
+void PaintExcludeTopShadow(QPainter &p, int radius, const QRect &r) {
+	constexpr auto kHorizontalOffset = 1;
+	constexpr auto kVerticalOffset = 2;
+	const auto opacity = p.opacity();
+	p.setOpacity(opacity * 0.2);
+	p.drawRoundedRect(
+		r + QMargins(kHorizontalOffset, -radius, kHorizontalOffset, 0),
+		radius,
+		radius);
+	p.setOpacity(opacity * 0.2);
+	p.drawRoundedRect(
+		r + QMargins(0, 0, 0, kVerticalOffset),
+		radius,
+		radius);
+	p.setOpacity(opacity * 0.4);
+	p.drawRoundedRect(
+		r + QMargins(0, 0, 0, kVerticalOffset / 2),
+		radius,
+		radius);
+	p.setOpacity(opacity);
+}
+
+} // namespace
 
 QRect BubbleWrap::innerRect() const {
 	return rect() - st::userpicBuilderEmojiBubblePadding;
@@ -33,29 +59,28 @@ not_null<BubbleWrap*> AddBubbleWrap(
 		container,
 		object_ptr<BubbleWrap>(container)))->entity();
 	bubble->resize(size);
-	const auto rounding = BubbleRounding{
-		.topLeft = BubbleCornerRounding::Small,
-		.topRight = BubbleCornerRounding::Small,
-		.bottomLeft = BubbleCornerRounding::Small,
-		.bottomRight = BubbleCornerRounding::Small,
-	};
+
+	auto cached = QImage(
+		size * style::DevicePixelRatio(),
+		QImage::Format_ARGB32_Premultiplied);
+	cached.setDevicePixelRatio(style::DevicePixelRatio());
+	cached.fill(Qt::transparent);
+	{
+		auto p = QPainter(&cached);
+		const auto innerRect = bubble->innerRect();
+		auto hq = PainterHighQualityEnabler(p);
+		const auto radius = st::bubbleRadiusSmall;
+		p.setPen(Qt::NoPen);
+		p.setBrush(st::shadowFg);
+		PaintExcludeTopShadow(p, radius, innerRect);
+		p.setBrush(st::boxBg);
+		p.drawRoundedRect(innerRect, radius, radius);
+	}
 
 	bubble->paintRequest(
-	) | rpl::start_with_next([=] {
+	) | rpl::start_with_next([bubble, cached = std::move(cached)] {
 		auto p = QPainter(bubble);
-		const auto innerRect = bubble->innerRect();
-		const auto args = SimpleBubble{
-			.st = chatStyle(),
-			.geometry = innerRect,
-			.pattern = nullptr,
-			.patternViewport = innerRect,
-			.outerWidth = bubble->width(),
-			.selected = false,
-			.shadowed = true,
-			.outbg = false,
-			.rounding = rounding,
-		};
-		PaintBubble(p, args);
+		p.drawImage(0, 0, cached);
 	}, bubble->lifetime());
 
 	return bubble;