98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "drm_buffer.h"
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#include "logging.h"
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// system
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#include <sys/mman.h>
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// c++
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#include <cerrno>
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// drm
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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namespace KWin
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{
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DrmBuffer:: DrmBuffer(int fd)
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: m_fd(fd)
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{
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}
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// DrmDumbBuffer
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DrmDumbBuffer::DrmDumbBuffer(int fd, const QSize &size)
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: DrmBuffer(fd)
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{
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m_size = size;
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drm_mode_create_dumb createArgs;
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memset(&createArgs, 0, sizeof createArgs);
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createArgs.bpp = 32;
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createArgs.width = size.width();
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createArgs.height = size.height();
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if (drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &createArgs) != 0) {
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qCWarning(KWIN_DRM) << "DRM_IOCTL_MODE_CREATE_DUMB failed";
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return;
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}
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m_handle = createArgs.handle;
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m_bufferSize = createArgs.size;
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m_stride = createArgs.pitch;
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if (drmModeAddFB(fd, size.width(), size.height(), 24, 32,
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m_stride, createArgs.handle, &m_bufferId) != 0) {
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qCWarning(KWIN_DRM) << "drmModeAddFB failed with errno" << errno;
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}
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}
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DrmDumbBuffer::~DrmDumbBuffer()
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{
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if (m_bufferId) {
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drmModeRmFB(fd(), m_bufferId);
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}
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delete m_image;
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if (m_memory) {
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munmap(m_memory, m_bufferSize);
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}
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if (m_handle) {
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drm_mode_destroy_dumb destroyArgs;
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destroyArgs.handle = m_handle;
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drmIoctl(fd(), DRM_IOCTL_MODE_DESTROY_DUMB, &destroyArgs);
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}
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}
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bool DrmDumbBuffer::needsModeChange(DrmBuffer *b) const {
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if (DrmDumbBuffer *db = dynamic_cast<DrmDumbBuffer*>(b)) {
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return m_stride != db->stride();
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} else {
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return true;
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}
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}
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bool DrmDumbBuffer::map(QImage::Format format)
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{
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if (!m_handle || !m_bufferId) {
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return false;
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}
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drm_mode_map_dumb mapArgs;
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memset(&mapArgs, 0, sizeof mapArgs);
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mapArgs.handle = m_handle;
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if (drmIoctl(fd(), DRM_IOCTL_MODE_MAP_DUMB, &mapArgs) != 0) {
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return false;
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}
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void *address = mmap(nullptr, m_bufferSize, PROT_WRITE, MAP_SHARED, fd(), mapArgs.offset);
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if (address == MAP_FAILED) {
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return false;
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}
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m_memory = address;
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m_image = new QImage((uchar*)m_memory, m_size.width(), m_size.height(), m_stride, format);
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return !m_image->isNull();
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}
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}
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