qpaintersurfacetexture_wayland.cpp

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/*
    SPDX-FileCopyrightText: 2021 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#include "qpaintersurfacetexture_wayland.h"
#include "core/graphicsbufferview.h"
 
#include <QPainter>
 
namespace KWin
{
 
QPainterSurfaceTextureWayland::QPainterSurfaceTextureWayland(QPainterBackend *backend, SurfacePixmap *pixmap)
    : QPainterSurfaceTexture(backend)
    , m_pixmap(pixmap)
{
}
 
bool QPainterSurfaceTextureWayland::create()
{
    const GraphicsBufferView view(m_pixmap->buffer());
    if (Q_LIKELY(view.image())) {
        // The buffer data is copied as the buffer interface returns a QImage
        // which doesn't own the data of the underlying wl_shm_buffer object.
        m_image = view.image()->copy();
    }
    return !m_image.isNull();
}
 
void QPainterSurfaceTextureWayland::update(const QRegion &region)
{
    const GraphicsBufferView view(m_pixmap->buffer());
    if (Q_UNLIKELY(!view.image())) {
        return;
    }
 
    QPainter painter(&m_image);
    painter.setCompositionMode(QPainter::CompositionMode_Source);
 
    // The buffer data is copied as the buffer interface returns a QImage
    // which doesn't own the data of the underlying wl_shm_buffer object.
    for (const QRect &rect : region) {
        painter.drawImage(rect, *view.image(), rect);
    }
}
 
} // namespace KWin