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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "shmserverbufferintegration.h"
#include <QtWaylandClient/private/qwaylanddisplay_p.h>
#include <QDebug>
#include <QtOpenGL/QOpenGLTexture>
#include <QtGui/QOpenGLContext>
#include <QtGui/QImage>
#include <QtCore/QSharedMemory>
QT_BEGIN_NAMESPACE
static QOpenGLTexture *createTextureFromShm(const QString &key, int w, int h, int bpl, int format)
{
QT_IGNORE_DEPRECATIONS(QSharedMemory shm(key);)
bool ok;
ok = shm.attach(QSharedMemory::ReadOnly);
if (!ok) {
qWarning() << "Could not attach to" << key;
return nullptr;
}
ok = shm.lock();
if (!ok) {
qWarning() << "Could not lock" << key << "for reading";
return nullptr;
}
QImage::Format imageFormat;
switch (format) {
case QtWayland::qt_shm_emulation_server_buffer::format_RGBA32:
imageFormat = QImage::Format_RGBA8888;
break;
case QtWayland::qt_shm_emulation_server_buffer::format_A8:
imageFormat = QImage::Format_Alpha8;
break;
default:
qWarning() << "ShmServerBuffer: unknown format" << format;
imageFormat = QImage::Format_RGBA8888;
break;
}
QImage image(static_cast<const uchar*>(shm.constData()), w, h, bpl, imageFormat);
if (!QOpenGLContext::currentContext())
qWarning("ShmServerBuffer: creating texture with no current context");
auto *tex = new QOpenGLTexture(image, QOpenGLTexture::DontGenerateMipMaps);
shm.unlock();
return tex;
}
namespace QtWaylandClient {
ShmServerBuffer::ShmServerBuffer(const QString &key, const QSize& size, int bytesPerLine, QWaylandServerBuffer::Format format)
: m_key(key)
, m_bpl(bytesPerLine)
{
m_format = format;
m_size = size;
}
ShmServerBuffer::~ShmServerBuffer()
{
}
QOpenGLTexture *ShmServerBuffer::toOpenGlTexture()
{
if (!m_texture)
m_texture = createTextureFromShm(m_key, m_size.width(), m_size.height(), m_bpl, m_format);
return m_texture;
}
void ShmServerBufferIntegration::initialize(QWaylandDisplay *display)
{
m_display = display;
display->addRegistryListener(&wlDisplayHandleGlobal, this);
}
QWaylandServerBuffer *ShmServerBufferIntegration::serverBuffer(struct qt_server_buffer *buffer)
{
return static_cast<QWaylandServerBuffer *>(qt_server_buffer_get_user_data(buffer));
}
void ShmServerBufferIntegration::wlDisplayHandleGlobal(void *data, ::wl_registry *registry, uint32_t id, const QString &interface, uint32_t version)
{
Q_UNUSED(version);
if (interface == "qt_shm_emulation_server_buffer") {
auto *integration = static_cast<ShmServerBufferIntegration *>(data);
integration->QtWayland::qt_shm_emulation_server_buffer::init(registry, id, 1);
}
}
void QtWaylandClient::ShmServerBufferIntegration::shm_emulation_server_buffer_server_buffer_created(qt_server_buffer *id, const QString &key, int32_t width, int32_t height, int32_t bytes_per_line, int32_t format)
{
QSize size(width, height);
auto fmt = QWaylandServerBuffer::Format(format);
auto *server_buffer = new ShmServerBuffer(key, size, bytes_per_line, fmt);
qt_server_buffer_set_user_data(id, server_buffer);
}
}
QT_END_NAMESPACE
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