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authorLuboš Luňák <l.lunak@collabora.com>2020-10-05 13:07:18 +0200
committerLuboš Luňák <l.lunak@collabora.com>2020-10-05 19:43:15 +0200
commitd3792300afec9c9cb8751cae5b46e8f9198214b4 (patch)
tree82c1902d48fccc8ea0f769d7b6af524008632ae0 /slideshow/source/engine/slideshowimpl.cxx
parente366c928819c44b5c253c45dca6dae40b71c9808 (diff)
try not to hog the CPU during slideshow animations
Try to sleep for most of the busy-waiting loop. Seeing this CPU usage is annoying when profiling. Change-Id: Ia01b547b28a22ffcb0e841ea582c93891cf1c5c5 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/103960 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk> Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
Diffstat (limited to 'slideshow/source/engine/slideshowimpl.cxx')
-rw-r--r--slideshow/source/engine/slideshowimpl.cxx13
1 files changed, 11 insertions, 2 deletions
diff --git a/slideshow/source/engine/slideshowimpl.cxx b/slideshow/source/engine/slideshowimpl.cxx
index ba4d17cd6c1d..3bfee3cb88ba 100644
--- a/slideshow/source/engine/slideshowimpl.cxx
+++ b/slideshow/source/engine/slideshowimpl.cxx
@@ -28,6 +28,7 @@
#include <comphelper/scopeguard.hxx>
#include <comphelper/storagehelper.hxx>
#include <cppcanvas/polypolygon.hxx>
+#include <osl/thread.hxx>
#include <tools/debug.hxx>
@@ -2395,8 +2396,16 @@ void FrameSynchronization::Synchronize()
if (mbIsActive)
{
// Do busy waiting for now.
- while (maTimer.getElapsedTime() < mnNextFrameTargetTime)
- ;
+ for(;;)
+ {
+ double remainingTime = mnNextFrameTargetTime - maTimer.getElapsedTime();
+ if(remainingTime <= 0)
+ break;
+ // Try to sleep most of it.
+ int remainingMilliseconds = remainingTime * 1000;
+ if(remainingMilliseconds > 2)
+ osl::Thread::wait(std::chrono::milliseconds(remainingMilliseconds - 2));
+ }
}
MarkCurrentFrame();