1// Copyright (C) 2017 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "shmserverbufferintegration.h"
5#include <QtWaylandClient/private/qwaylanddisplay_p.h>
6#include <QDebug>
7#include <QtOpenGL/QOpenGLTexture>
8#include <QtGui/QOpenGLContext>
9#include <QtGui/QImage>
10#include <QtCore/QSharedMemory>
11
12QT_BEGIN_NAMESPACE
13
14static QOpenGLTexture *createTextureFromShm(const QString &key, int w, int h, int bpl, int format)
15{
16 QT_IGNORE_DEPRECATIONS(QSharedMemory shm(key);)
17 bool ok;
18 ok = shm.attach(mode: QSharedMemory::ReadOnly);
19 if (!ok) {
20 qWarning() << "Could not attach to" << key;
21 return nullptr;
22 }
23 ok = shm.lock();
24 if (!ok) {
25 qWarning() << "Could not lock" << key << "for reading";
26 return nullptr;
27 }
28
29 QImage::Format imageFormat;
30 switch (format) {
31 case QtWayland::qt_shm_emulation_server_buffer::format_RGBA32:
32 imageFormat = QImage::Format_RGBA8888;
33 break;
34 case QtWayland::qt_shm_emulation_server_buffer::format_A8:
35 imageFormat = QImage::Format_Alpha8;
36 break;
37 default:
38 qWarning() << "ShmServerBuffer: unknown format" << format;
39 imageFormat = QImage::Format_RGBA8888;
40 break;
41 }
42
43 QImage image(static_cast<const uchar*>(shm.constData()), w, h, bpl, imageFormat);
44
45 if (!QOpenGLContext::currentContext())
46 qWarning(msg: "ShmServerBuffer: creating texture with no current context");
47
48 auto *tex = new QOpenGLTexture(image, QOpenGLTexture::DontGenerateMipMaps);
49 shm.unlock();
50 return tex;
51}
52
53
54namespace QtWaylandClient {
55
56ShmServerBuffer::ShmServerBuffer(const QString &key, const QSize& size, int bytesPerLine, QWaylandServerBuffer::Format format)
57 : m_key(key)
58 , m_bpl(bytesPerLine)
59{
60 m_format = format;
61 m_size = size;
62}
63
64ShmServerBuffer::~ShmServerBuffer()
65{
66}
67
68QOpenGLTexture *ShmServerBuffer::toOpenGlTexture()
69{
70 if (!m_texture)
71 m_texture = createTextureFromShm(key: m_key, w: m_size.width(), h: m_size.height(), bpl: m_bpl, format: m_format);
72
73 return m_texture;
74}
75
76void ShmServerBufferIntegration::initialize(QWaylandDisplay *display)
77{
78 m_display = display;
79 display->addRegistryListener(listener: &wlDisplayHandleGlobal, data: this);
80}
81
82QWaylandServerBuffer *ShmServerBufferIntegration::serverBuffer(struct qt_server_buffer *buffer)
83{
84 return static_cast<QWaylandServerBuffer *>(qt_server_buffer_get_user_data(buffer));
85}
86
87void ShmServerBufferIntegration::wlDisplayHandleGlobal(void *data, ::wl_registry *registry, uint32_t id, const QString &interface, uint32_t version)
88{
89 Q_UNUSED(version);
90 if (interface == "qt_shm_emulation_server_buffer") {
91 auto *integration = static_cast<ShmServerBufferIntegration *>(data);
92 integration->QtWayland::qt_shm_emulation_server_buffer::init(registry, id, 1);
93 }
94}
95
96
97void 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)
98{
99 QSize size(width, height);
100 auto fmt = QWaylandServerBuffer::Format(format);
101 auto *server_buffer = new ShmServerBuffer(key, size, bytes_per_line, fmt);
102 qt_server_buffer_set_user_data(id, server_buffer);
103}
104
105}
106
107QT_END_NAMESPACE
108

source code of qtwayland/src/hardwareintegration/client/shm-emulation-server/shmserverbufferintegration.cpp