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体验新版 GitCode,发现更多精彩内容 >>
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16074e1e
编写于
10月 07, 2015
作者:
C
Chinmay Garde
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Document StatisticsOverlay.rasterizerThreshold
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8a87f232
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sky/packages/sky/lib/src/widgets/statistics_overlay.dart
sky/packages/sky/lib/src/widgets/statistics_overlay.dart
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sky/packages/sky/lib/src/widgets/statistics_overlay.dart
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16074e1e
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@@ -51,6 +51,33 @@ class StatisticsOverlay extends LeafRenderObjectWidget {
...
@@ -51,6 +51,33 @@ class StatisticsOverlay extends LeafRenderObjectWidget {
);
);
final
int
optionsMask
;
final
int
optionsMask
;
/// The rasterizer threshold is an integer specifying the number of frame
/// intervals that the rasterizer must miss before it decides that the frame
/// is suitable for capturing an SkPicture trace from for further analysis.
///
/// For example, if you want a trace of all pictures that could not be
/// renderered by the rasterizer within the frame boundary (and hence caused
/// jank), specify 1. Specifying 2 will trace all pictures that took more
/// more than 2 frame intervals to render. Adjust this value to only capture
/// the particularly expensive pictures while skipping the others. Specifying
/// 0 disables all capture.
///
/// Captured traces are placed on your device in the application documents
/// directory in this form "trace_<timestamp_since_app_start>.skp". These can
/// be viewed in the Skia debugger.
///
/// Notes:
/// The rasterizer only takes into account the time it took to render
/// the already constructed picture. This include the Skia calls (which is
/// also why an SkPicture trace is generated) but not any of the time spent in
/// dart to construct that picture. To profile that part of your code, use
/// the instrumentation available in observatory.
///
/// To decide what threshold interval to use, count the number of horizontal
/// lines displayed in the statistics overlay for the rasterizer (not the
/// engine). That should give an idea of how often frames are skipped (and by
/// how many frame intervals).
final
int
rasterizerThreshold
;
final
int
rasterizerThreshold
;
StatisticsBox
createRenderObject
()
=>
new
StatisticsBox
(
StatisticsBox
createRenderObject
()
=>
new
StatisticsBox
(
...
...
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