77ec8774a0
Revert all the work that happened on the master branch.
Sadly, this is the only way to merge the current development branch back
into master.
It is now abundantly clear that I merged the 1.99 branch far too soon,
and that Clutter 2.0 won't happen any time soon, if at all.
Since having the development happen on a separate branch throws a lot of
people into confusion, let's undo the clutter-1.99 → master merge, and
move back the development of Clutter to the master branch.
In order to do so, we need to do some surgery to the Git repository.
First, we do a massive revert in a single commit of all that happened
since the switch to 1.99 and the API version bump done with the
89a2862b05 commit. The history is too long
to be reverted commit by commit without being extremely messy.
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Neil Roberts <neil@linux.intel.com>
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*
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* Copyright (C) 2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
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/* This file contains the common code to check whether an interval has
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expired used in clutter-frame-source and clutter-timeout-pool. */
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#include "clutter-timeout-interval.h"
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void
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_clutter_timeout_interval_init (ClutterTimeoutInterval *interval,
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guint fps)
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{
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#if GLIB_CHECK_VERSION (2, 27, 3)
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interval->start_time = g_get_monotonic_time () / 1000;
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#else
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{
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GTimeVal start_time;
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g_get_current_time (&start_time);
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interval->start_time = start_time.tv_sec * 1000
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+ start_time.tv_usec / 1000;
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}
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#endif
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interval->fps = fps;
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interval->frame_count = 0;
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}
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static gint64
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_clutter_timeout_interval_get_ticks (gint64 current_time,
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ClutterTimeoutInterval *interval)
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{
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return MAX (current_time - interval->start_time, 0);
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}
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gboolean
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_clutter_timeout_interval_prepare (gint64 current_time,
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ClutterTimeoutInterval *interval,
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gint *delay)
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{
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gint elapsed_time, new_frame_num;
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elapsed_time = _clutter_timeout_interval_get_ticks (current_time, interval);
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new_frame_num = elapsed_time * interval->fps / 1000;
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/* If time has gone backwards or the time since the last frame is
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greater than the two frames worth then reset the time and do a
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frame now */
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if (new_frame_num < interval->frame_count ||
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new_frame_num - interval->frame_count > 2)
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{
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/* Get the frame time rounded up to the nearest ms */
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guint frame_time = (1000 + interval->fps - 1) / interval->fps;
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/* Reset the start time */
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interval->start_time = current_time;
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/* Move the start time as if one whole frame has elapsed */
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interval->start_time -= frame_time;
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interval->frame_count = 0;
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if (delay)
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*delay = 0;
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return TRUE;
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}
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else if (new_frame_num > interval->frame_count)
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{
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if (delay)
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*delay = 0;
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return TRUE;
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}
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else
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{
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if (delay)
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*delay = ((interval->frame_count + 1) * 1000 / interval->fps
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- elapsed_time);
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return FALSE;
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}
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}
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gboolean
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_clutter_timeout_interval_dispatch (ClutterTimeoutInterval *interval,
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GSourceFunc callback,
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gpointer user_data)
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{
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if ((* callback) (user_data))
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{
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interval->frame_count++;
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return TRUE;
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}
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return FALSE;
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}
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gint
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_clutter_timeout_interval_compare_expiration (const ClutterTimeoutInterval *a,
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const ClutterTimeoutInterval *b)
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{
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guint a_delay = 1000 / a->fps;
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guint b_delay = 1000 / b->fps;
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gint64 b_difference;
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gint comparison;
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b_difference = a->start_time - b->start_time;
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comparison = ((gint) ((a->frame_count + 1) * a_delay)
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- (gint) ((b->frame_count + 1) * b_delay + b_difference));
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return (comparison < 0 ? -1
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: comparison > 0 ? 1
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: 0);
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}
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