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Telegram/lib_lottie/lottie/details/lottie_frame_provider.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 "lottie/lottie_common.h"
+
+namespace Lottie {
+
+struct FrameProviderToken {
+	virtual ~FrameProviderToken() = default;
+
+	FrameRenderResult result = FrameRenderResult::Ok;
+	bool exclusive = false;
+};
+
+class FrameProvider {
+public:
+	virtual ~FrameProvider() = default;
+
+	virtual QImage construct(
+		std::unique_ptr<FrameProviderToken> &token,
+		const FrameRequest &request) = 0;
+	[[nodiscard]] virtual const Information &information() = 0;
+	[[nodiscard]] virtual bool valid() = 0;
+
+	[[nodiscard]] virtual int sizeRounding() = 0;
+
+	[[nodiscard]] virtual std::unique_ptr<FrameProviderToken> createToken() {
+		// Used for shared frame provider.
+		return nullptr;
+	}
+
+	virtual bool render(
+		const std::unique_ptr<FrameProviderToken> &token,
+		QImage &to,
+		const FrameRequest &request,
+		int index) = 0;
+
+};
+
+} // namespace Lottie