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97 lines
2.3 KiB
97 lines
2.3 KiB
/* |
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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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