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In order to reliably manage the reference count of the user data passed to page flip listeners - being the stage view - make the ownership of this data travel through the different objects that take responsibility of the next step. Initially this is the MetaKmsPageFlipListener that belongs to a MetaKmsUpdate. When a page flip is successfully queued, the ownership is transferred to a MetaKmsPageFlipClosure that is part of a MetaKmsPageFlipData. In the simple impl device, the MetaKmsPageFlipData is passed to drmModePageFlip(), then returned back via the DRM event. In the future atomic impl device, the MetaKmsPageFlipData is stored in a table, then retrieved when DRM event are handled. When the DRM events are handled, the page flip listener's interface callbacks are invoked, and after that, the user data is freed using the passed GDestroyNotify function, in the main context, the same as where the interface callbacks were called. When a page flip fails, the ownership is also transferred to a MetaKmsPageFlipClosure that is part of a MetaKmsPageFlipData. This page flip data will be passed to the main context via a callback, where it will discard the page flip, and free the user data using the provided GDestroyNotify. Note that this adds back a page flip listener type flag for telling the KMS implementation whether to actively discard a page flip via the interface, or just free the user data. Avoiding discarding via the interface is needed for the direct scanout case, where we immediately need to know the result in order to fall back to the composite pipeline if the direct scanout failed. We do in fact also need active discard via the interface paths, e.g. in the simple impl device when we're asynchronously retrying a page flip, so replace the ad-hoc discard paths in meta-renderer-native.c and replace them by not asking for no-discard page flip error handling. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>
66 lines
2.9 KiB
C
66 lines
2.9 KiB
C
/*
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* Copyright (C) 2019 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef META_KMS_PAGE_FLIP_H
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#define META_KMS_PAGE_FLIP_H
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#include <glib.h>
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#include "backends/native/meta-kms-types.h"
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typedef struct _MetaKmsPageFlipData MetaKmsPageFlipData;
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typedef void (* MetaPageFlipDataFeedbackFunc) (MetaKmsPageFlipData *page_flip_data);
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MetaKmsPageFlipData * meta_kms_page_flip_data_new (MetaKmsImplDevice *impl_device,
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MetaKmsCrtc *crtc);
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MetaKmsPageFlipData * meta_kms_page_flip_data_ref (MetaKmsPageFlipData *page_flip_data);
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void meta_kms_page_flip_data_unref (MetaKmsPageFlipData *page_flip_data);
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void meta_kms_page_flip_data_add_listener (MetaKmsPageFlipData *page_flip_data,
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const MetaKmsPageFlipListenerVtable *vtable,
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MetaKmsPageFlipListenerFlag flags,
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gpointer user_data,
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GDestroyNotify destroy_notify);
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MetaKmsImplDevice * meta_kms_page_flip_data_get_impl_device (MetaKmsPageFlipData *page_flip_data);
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MetaKmsCrtc * meta_kms_page_flip_data_get_crtc (MetaKmsPageFlipData *page_flip_data);
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void meta_kms_page_flip_data_set_timings_in_impl (MetaKmsPageFlipData *page_flip_data,
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unsigned int sequence,
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unsigned int sec,
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unsigned int usec);
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void meta_kms_page_flip_data_flipped_in_impl (MetaKmsPageFlipData *page_flip_data);
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void meta_kms_page_flip_data_mode_set_fallback_in_impl (MetaKmsPageFlipData *page_flip_data);
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void meta_kms_page_flip_data_discard_in_impl (MetaKmsPageFlipData *page_flip_data,
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const GError *error);
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void meta_kms_page_flip_data_take_error (MetaKmsPageFlipData *page_flip_data,
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GError *error);
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void meta_kms_page_flip_data_make_symbolic (MetaKmsPageFlipData *page_flip_data);
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#endif /* META_KMS_PAGE_FLIP_H */
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