68d7a5e847
GLib 2.28 will deprecate GTimeVal and related API in favour of standardizing on microseconds granularity for all time-based API. Clutter should switch too. All of the current users of GTimeVal convert to milliseconds when doing time operations, and use GTimeVal only as storage. This can effectively be replaced by a gint64. The Master Clock uses a microsecond resolution, except when interacting with the main loop itself, since the main loop has a millisecond resolution - at least until Ryan Lortie manages to switch that too to microseconds on Linux. The clutter_timeline_do_tick() function was erroneously not privatized, but it was still assumed to be private; we should just remove it from the public symbols.
136 lines
3.8 KiB
C
136 lines
3.8 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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/* 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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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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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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