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Telegram/lib_ui/ui/effects/round_area_with_shadow.h

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+// 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 {
+
+struct ImageSubrect {
+	not_null<QImage*> image;
+	QRect rect;
+};
+
+class RoundAreaWithShadow final {
+public:
+	static constexpr auto kFramesCount = 32;
+
+	[[nodiscard]] static QImage PrepareImage(QSize size);
+	[[nodiscard]] static QImage PrepareFramesCache(
+		QSize frame,
+		int columns = 1);
+	[[nodiscard]] static QRect FrameCacheRect(
+		int frameIndex,
+		int column,
+		QSize frame);
+
+	// Returns center area which could be just filled with a solid color.
+	static QRect FillWithImage(
+		QPainter &p,
+		QRect geometry,
+		const ImageSubrect &pattern);
+
+	RoundAreaWithShadow(QSize inner, QMargins shadow, int twiceRadiusMax);
+
+	void setBackgroundColor(const QColor &background);
+	void setShadowColor(const QColor &shadow);
+
+	[[nodiscard]] ImageSubrect validateFrame(
+		int frameIndex,
+		float64 scale,
+		float64 radius);
+	[[nodiscard]] ImageSubrect validateOverlayMask(
+		int frameIndex,
+		QSize innerSize,
+		float64 radius,
+		int twiceRadius,
+		float64 scale);
+	[[nodiscard]] ImageSubrect validateOverlayShadow(
+		int frameIndex,
+		QSize innerSize,
+		float64 radius,
+		int twiceRadius,
+		float64 scale,
+		const ImageSubrect &mask);
+
+	void overlayExpandedBorder(
+		QPainter &p,
+		QSize size,
+		float64 expandRatio,
+		float64 radiusFrom,
+		float64 radiusTill,
+		float64 scale);
+
+private:
+	[[nodiscard]] QRect validateShadow(
+		int frameIndex,
+		float64 scale,
+		float64 radius);
+
+	QRect _inner;
+	QSize _outer;
+	QSize _overlay;
+
+	std::array<bool, kFramesCount> _validBg = { { false } };
+	std::array<bool, kFramesCount> _validShadow = { { false } };
+	std::array<bool, kFramesCount> _validOverlayMask = { { false } };
+	std::array<bool, kFramesCount> _validOverlayShadow = { { false } };
+	QColor _background;
+	QColor _gradient;
+	QColor _shadow;
+	QImage _cacheBg;
+	QImage _shadowParts;
+	QImage _overlayCacheParts;
+	QImage _overlayMaskScaled;
+	QImage _overlayShadowScaled;
+	QImage _shadowBuffer;
+
+};
+
+} // namespace Ui