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Telegram/lib_lottie/lottie/lottie_icon.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
+
+#include "ui/style/style_core_types.h"
+#include "ui/effects/animations.h"
+#include "base/weak_ptr.h"
+
+#include <crl/crl_time.h>
+#include <QtCore/QByteArray>
+#include <optional>
+
+namespace Ui::Text {
+class CustomEmoji;
+} // namespace Ui::Text
+
+namespace Lottie {
+
+struct IconDescriptor {
+	QString name;
+	QString path;
+	QByteArray json;
+	const style::color *color = nullptr;
+	QSize sizeOverride;
+	int frame = 0;
+	bool limitFps = false;
+	bool colorizeUsingAlpha = false;
+};
+
+class Icon final : public base::has_weak_ptr {
+public:
+	explicit Icon(IconDescriptor &&descriptor);
+	Icon(const Icon &other) = delete;
+	Icon &operator=(const Icon &other) = delete;
+	Icon(Icon &&other) = delete; // _animation captures 'this'.
+	Icon &operator=(Icon &&other) = delete;
+
+	[[nodiscard]] bool valid() const;
+	[[nodiscard]] int frameIndex() const;
+	[[nodiscard]] int framesCount() const;
+	[[nodiscard]] QImage frame() const;
+	[[nodiscard]] int width() const;
+	[[nodiscard]] int height() const;
+	[[nodiscard]] QSize size() const;
+
+	struct ResizedFrame {
+		QImage image;
+		bool scaled = false;
+	};
+	[[nodiscard]] ResizedFrame frame(
+		QSize desiredSize,
+		Fn<void()> updateWithPerfect) const;
+
+	void paint(
+		QPainter &p,
+		int x,
+		int y,
+		std::optional<QColor> colorOverride = std::nullopt);
+	void paintInCenter(
+		QPainter &p,
+		QRect rect,
+		std::optional<QColor> colorOverride = std::nullopt);
+	void animate(
+		Fn<void()> update,
+		int frameFrom,
+		int frameTo,
+		std::optional<crl::time> duration = std::nullopt);
+	void jumpTo(int frame, Fn<void()> update);
+	[[nodiscard]] bool animating() const;
+
+private:
+	struct Frame;
+	class Inner;
+	friend class Inner;
+
+	void wait() const;
+	[[nodiscard]] int wantedFrameIndex() const;
+	void preloadNextFrame(QSize updatedDesiredSize = QSize()) const;
+	void frameJumpFinished();
+
+	std::shared_ptr<Inner> _inner;
+	const style::color *_color = nullptr;
+	Ui::Animations::Simple _animation;
+	mutable int _animationFrameTo = 0;
+	const bool _colorizeUsingAlpha = false;
+	mutable Fn<void()> _repaint;
+
+};
+
+[[nodiscard]] std::unique_ptr<Icon> MakeIcon(IconDescriptor &&descriptor);
+[[nodiscard]] std::unique_ptr<Ui::Text::CustomEmoji> MakeEmoji(
+	IconDescriptor &&descriptor,
+	Fn<void()> repaint);
+
+} // namespace Lottie