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Adapt to new Tweener frame ticker API

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Now that getTime() has been added to the frame ticker interface
we can implement frame dropping in a more straightforward way
than adjusting the FRAME_RATE member variable to fool Tweener
into doing the right thing.

svn path=/trunk/; revision=156
This commit is contained in:
Owen Taylor 2009-01-20 18:32:25 +00:00
parent 9a00ab1594
commit ff5f960978
1 changed files with 12 additions and 5 deletions
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17
js/ui/main.js
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@ -37,13 +37,14 @@ function ClutterFrameTicker() {
} }
ClutterFrameTicker.prototype = { ClutterFrameTicker.prototype = {
TARGET_FRAME_RATE : 60, FRAME_RATE : 60,
_init : function() { _init : function() {
// We don't have a finite duration; tweener will tell us to stop // We don't have a finite duration; tweener will tell us to stop
// when we need to stop, so use 1000 seconds as "infinity" // when we need to stop, so use 1000 seconds as "infinity"
this._timeline = new Clutter.Timeline({ fps: this.TARGET_FRAME_RATE, this._timeline = new Clutter.Timeline({ fps: this.FRAME_RATE,
duration: 1000*1000 }); duration: 1000*1000 });
this._currentTime = 0;
this._frame = 0; this._frame = 0;
let me = this; let me = this;
@ -76,13 +77,18 @@ ClutterFrameTicker.prototype = {
delta = frame - this._frame; delta = frame - this._frame;
if (delta == 0) // protect against divide-by-0 if we get a frame twice if (delta == 0) // protect against divide-by-0 if we get a frame twice
this.FRAME_RATE = this.TARGET_FRAME_RATE; delta = 1;
else
this.FRAME_RATE = this.TARGET_FRAME_RATE / delta; // currentTime is in milliseconds
this._currentTime += (1000 * delta) / this.FRAME_RATE;
this._frame = frame; this._frame = frame;
this.emit('prepare-frame'); this.emit('prepare-frame');
}, },
getTime : function() {
return this._currentTime;
},
start : function() { start : function() {
this._timeline.start(); this._timeline.start();
}, },
@ -90,6 +96,7 @@ ClutterFrameTicker.prototype = {
stop : function() { stop : function() {
this._timeline.stop(); this._timeline.stop();
this._frame = 0; this._frame = 0;
this._currentTime = 0;
} }
}; };