nheko/src/BlurhashProvider.h

// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#pragma once

#include <QQuickAsyncImageProvider>
#include <QQuickImageResponse>

#include <QImage>
#include <QThreadPool>

class BlurhashResponse
  : public QQuickImageResponse
  , public QRunnable
{
public:
        BlurhashResponse(const QString &id, const QSize &requestedSize)

          : m_id(id)
          , m_requestedSize(requestedSize)
        {
                setAutoDelete(false);
        }

        QQuickTextureFactory *textureFactory() const override
        {
                return QQuickTextureFactory::textureFactoryForImage(m_image);
        }
        QString errorString() const override { return m_error; }

        void run() override;

        QString m_id, m_error;
        QSize m_requestedSize;
        QImage m_image;
};

class BlurhashProvider
  : public QObject
  , public QQuickAsyncImageProvider
{
        Q_OBJECT
public slots:
        QQuickImageResponse *requestImageResponse(const QString &id,
                                                  const QSize &requestedSize) override
        {
                BlurhashResponse *response = new BlurhashResponse(id, requestedSize);
                pool.start(response);
                return response;
        }

private:
        QThreadPool pool;
};