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Telegram/lib_ui/ui/effects/frame_generator.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 <QtGui/QImage>
+
+#include <crl/crl_time.h>
+
+namespace Ui {
+
+class FrameGenerator {
+public:
+	virtual ~FrameGenerator() = default;
+
+	// 0 means unknown.
+	[[nodiscard]] virtual int count() = 0;
+
+	// 0. means unknown.
+	[[nodiscard]] virtual double rate() = 0;
+
+	struct Frame {
+		crl::time duration = 0;
+		QImage image;
+		bool last = false;
+	};
+	[[nodiscard]] virtual Frame renderNext(
+		QImage storage,
+		QSize size,
+		Qt::AspectRatioMode mode = Qt::IgnoreAspectRatio) = 0;
+	[[nodiscard]] virtual Frame renderCurrent(
+		QImage storage,
+		QSize size,
+		Qt::AspectRatioMode mode = Qt::IgnoreAspectRatio) = 0;
+
+	virtual void jumpToStart() = 0;
+
+};
+
+class ImageFrameGenerator final : public Ui::FrameGenerator {
+public:
+	explicit ImageFrameGenerator(const QByteArray &bytes);
+	explicit ImageFrameGenerator(const QImage &image);
+
+	int count() override;
+	double rate() override;
+	Frame renderNext(
+		QImage storage,
+		QSize size,
+		Qt::AspectRatioMode mode = Qt::IgnoreAspectRatio) override;
+	Frame renderCurrent(
+		QImage storage,
+		QSize size,
+		Qt::AspectRatioMode mode = Qt::IgnoreAspectRatio) override;
+	void jumpToStart() override;
+
+private:
+	QByteArray _bytes;
+	QImage _image;
+
+};
+
+[[nodiscard]] bool GoodStorageForFrame(const QImage &storage, QSize size);
+[[nodiscard]] QImage CreateFrameStorage(QSize size);
+
+} // namespace Ui