Added masked shadow corners for special layers.

CMakeLists.txt

@@ -227,6 +227,8 @@ PRIVATE
     ui/abstract_button.h
     ui/basic_click_handlers.cpp
     ui/basic_click_handlers.h
+    ui/cached_special_layer_shadow_corners.cpp
+    ui/cached_special_layer_shadow_corners.h
     ui/click_handler.cpp
     ui/click_handler.h
     ui/delayed_activation.cpp

ui/cached_special_layer_shadow_corners.cpp

@@ -0,0 +1,71 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#include "ui/cached_special_layer_shadow_corners.h"
+
+#include "ui/effects/ripple_animation.h"
+#include "styles/style_layers.h"
+
+namespace Ui {
+namespace {
+
+[[nodiscard]] std::array<QImage, 4> PrepareSpecialLayerShadowCorners() {
+	const auto &st = st::boxRoundShadow;
+
+	const auto s = QSize(
+		st::boxRadius * 2 + st.extend.left(),
+		st::boxRadius * 2 + st.extend.right());
+	const auto mask = Ui::RippleAnimation::maskByDrawer(s, false, [&](
+			QPainter &p) {
+		p.drawRoundedRect(QRect(QPoint(), s), st::boxRadius, st::boxRadius);
+	});
+	struct Corner {
+		const style::icon &icon;
+		QPoint factor;
+	};
+	const auto corners = std::vector<Corner>{
+		Corner{ st.topLeft, QPoint(1, 1) },
+		Corner{ st.bottomLeft, QPoint(1, 0) },
+		Corner{ st.topRight, QPoint(0, 1) },
+		Corner{ st.bottomRight, QPoint(0, 0) },
+	};
+	const auto processCorner = [&](int i) {
+		const auto &corner = corners[i];
+		auto result = QImage(
+			corner.icon.size() * style::DevicePixelRatio(),
+			QImage::Format_ARGB32_Premultiplied);
+		result.setDevicePixelRatio(style::DevicePixelRatio());
+		result.fill(Qt::transparent);
+
+		{
+			QPainter p(&result);
+			corner.icon.paint(p, 0, 0, corner.icon.width());
+			p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
+			p.drawImage(
+				corner.icon.width() * corner.factor.x()
+					- mask.width() / style::DevicePixelRatio() / 2,
+				corner.icon.height() * corner.factor.y()
+					- mask.height() / style::DevicePixelRatio() / 2,
+				mask);
+		}
+		return result;
+	};
+	return std::array<QImage, 4>{ {
+		processCorner(0),
+		processCorner(1),
+		processCorner(2),
+		processCorner(3),
+	} };
+}
+
+} // namespace
+
+const std::array<QImage, 4> &SpecialLayerShadowCorners() {
+	static const auto custom = PrepareSpecialLayerShadowCorners();
+	return custom;
+}
+
+} // namespace Ui

ui/cached_special_layer_shadow_corners.h

@@ -0,0 +1,13 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+namespace Ui {
+
+[[nodiscard]] const std::array<QImage, 4> &SpecialLayerShadowCorners();
+
+} // namespace Ui

ui/layers/layer_widget.cpp

@@ -6,6 +6,7 @@
 //
 #include "ui/layers/layer_widget.h"
 
+#include "ui/cached_special_layer_shadow_corners.h"
 #include "ui/layers/box_layer_widget.h"
 #include "ui/widgets/shadow.h"
 #include "ui/image/image_prepare.h"
@@ -21,7 +22,7 @@ namespace Ui {
 
 class LayerStackWidget::BackgroundWidget : public TWidget {
 public:
-	explicit BackgroundWidget(QWidget *parent);
+	using TWidget::TWidget;
 
 	void setDoneCallback(Fn<void()> callback) {
 		_doneCallback = std::move(callback);
@@ -63,7 +64,6 @@ private:
 	int _mainMenuCacheWidth = 0;
 	QPixmap _specialLayerCache;
 	QPixmap _layerCache;
-	RoundRect _roundRect;
 
 	Fn<void()> _doneCallback;
 
@@ -84,11 +84,6 @@ private:
 
 };
 
-LayerStackWidget::BackgroundWidget::BackgroundWidget(QWidget *parent)
-: TWidget(parent)
-, _roundRect(st::boxRadius, st::boxBg) {
-}
-
 void LayerStackWidget::BackgroundWidget::setCacheImages(
 		QPixmap &&bodyCache,
 		QPixmap &&mainMenuCache,
@@ -262,15 +257,9 @@ void LayerStackWidget::BackgroundWidget::paintEvent(QPaintEvent *e) {
 		if (topCorners || bottomCorners) {
 			p.setClipRegion(QRegion(rect()) - specialLayerBox.marginsRemoved(QMargins(st::boxRadius, 0, st::boxRadius, 0)) - specialLayerBox.marginsRemoved(QMargins(0, st::boxRadius, 0, st::boxRadius)));
 		}
-		Ui::Shadow::paint(p, specialLayerBox, width(), st::boxRoundShadow, sides);
-
+		Ui::Shadow::paint(p, specialLayerBox, width(), st::boxRoundShadow, sides, Ui::SpecialLayerShadowCorners());
 		if (topCorners || bottomCorners) {
-			// In case of painting the shadow above the special layer we get
-			// glitches in the corners, so we need to paint the corners once more.
 			p.setClipping(false);
-			auto parts = (topCorners ? (RectPart::TopLeft | RectPart::TopRight) : RectPart::None)
-				| (bottomCorners ? (RectPart::BottomLeft | RectPart::BottomRight) : RectPart::None);
-			_roundRect.paint(p, specialLayerBox, parts);
 		}
 	}
 

ui/widgets/shadow.cpp

@@ -14,22 +14,42 @@
 #include <QtGui/QtEvents>
 
 namespace Ui {
+namespace {
 
-PlainShadow::PlainShadow(QWidget *parent)
-: PlainShadow(parent, st::shadowFg) {
+struct CustomShadowCorners {
+	struct Image {
+	public:
+		Image(const QImage &image)
+		: _image(image) {
 		}
-
-PlainShadow::PlainShadow(QWidget *parent, style::color color)
-: RpWidget(parent)
-, _color(color) {
-	resize(st::lineWidth, st::lineWidth);
+		void paint(QPainter &p, int x, int y, int outerw) const {
+			p.drawImage(x, y, _image);
 		}
-
-void PlainShadow::paintEvent(QPaintEvent *e) {
-	QPainter(this).fillRect(e->rect(), _color);
+		[[nodiscard]] bool empty() const {
+			return _image.isNull();
 		}
+		[[nodiscard]] int width() const {
+			return _image.width() / style::DevicePixelRatio();
+		}
+		[[nodiscard]] int height() const {
+			return _image.height() / style::DevicePixelRatio();
+		}
+	private:
+		const QImage &_image;
+	};
+	const style::icon &left;
+	Image topLeft;
+	const style::icon &top;
+	Image topRight;
+	const style::icon &right;
+	Image bottomRight;
+	const style::icon &bottom;
+	Image bottomLeft;
+	const style::margins &extend;
+};
 
-void Shadow::paint(QPainter &p, const QRect &box, int outerWidth, const style::Shadow &st, RectParts sides) {
+template <typename Shadow>
+void ShadowPaint(QPainter &p, const QRect &box, int outerWidth, const Shadow &st, RectParts sides) {
 	auto left = (sides & RectPart::Left);
 	auto top = (sides & RectPart::Top);
 	auto right = (sides & RectPart::Right);
@@ -84,6 +104,47 @@ void Shadow::paint(QPainter &p, const QRect &box, int outerWidth, const style::S
 	}
 }
 
+} // namespace
+
+PlainShadow::PlainShadow(QWidget *parent)
+: PlainShadow(parent, st::shadowFg) {
+}
+
+PlainShadow::PlainShadow(QWidget *parent, style::color color)
+: RpWidget(parent)
+, _color(color) {
+	resize(st::lineWidth, st::lineWidth);
+}
+
+void PlainShadow::paintEvent(QPaintEvent *e) {
+	QPainter(this).fillRect(e->rect(), _color);
+}
+
+void Shadow::paint(QPainter &p, const QRect &box, int outerWidth, const style::Shadow &st, RectParts sides) {
+	ShadowPaint<style::Shadow>(p, box, outerWidth, st, std::move(sides));
+}
+
+void Shadow::paint(
+		QPainter &p,
+		const QRect &box,
+		int outerWidth,
+		const style::Shadow &st,
+		RectParts sides,
+		const std::array<QImage, 4> &corners) {
+	const auto shadow = CustomShadowCorners{
+		.left = st.left,
+		.topLeft = CustomShadowCorners::Image(corners[0]),
+		.top = st.top,
+		.topRight = CustomShadowCorners::Image(corners[2]),
+		.right = st.right,
+		.bottomRight = CustomShadowCorners::Image(corners[3]),
+		.bottom = st.bottom,
+		.bottomLeft = CustomShadowCorners::Image(corners[1]),
+		.extend = st.extend,
+	};
+	ShadowPaint<CustomShadowCorners>(p, box, outerWidth, shadow, std::move(sides));
+}
+
 QPixmap Shadow::grab(
 		not_null<TWidget*> target,
 		const style::Shadow &shadow,

ui/widgets/shadow.h

@@ -46,6 +46,14 @@ public:
 		const style::Shadow &st,
 		RectParts sides = RectPart::AllSides);
 
+	static void paint(
+		QPainter &p,
+		const QRect &box,
+		int outerWidth,
+		const style::Shadow &st,
+		RectParts sides,
+		const std::array<QImage, 4> &corners);
+
 	static QPixmap grab(
 		not_null<TWidget*> target,
 		const style::Shadow &shadow,