diff options
| -rw-r--r-- | services/java/com/android/server/power/ElectronBeam.java | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/services/java/com/android/server/power/ElectronBeam.java b/services/java/com/android/server/power/ElectronBeam.java index 2abdceb..9a53648 100644 --- a/services/java/com/android/server/power/ElectronBeam.java +++ b/services/java/com/android/server/power/ElectronBeam.java @@ -63,6 +63,11 @@ final class ElectronBeam { private static final float HSTRETCH_DURATION = 0.5f; private static final float VSTRETCH_DURATION = 1.0f - HSTRETCH_DURATION; + // The number of frames to draw when preparing the animation so that it will + // be ready to run smoothly. We use 3 frames because we are triple-buffered. + // See code for details. + private static final int DEJANK_FRAMES = 3; + // Set to true when the animation context has been fully prepared. private boolean mPrepared; private int mMode; @@ -145,6 +150,19 @@ final class ElectronBeam { // Done. mPrepared = true; + + // Dejanking optimization. + // Some GL drivers can introduce a lot of lag in the first few frames as they + // initialize their state and allocate graphics buffers for rendering. + // Work around this problem by rendering the first frame of the animation a few + // times. The rest of the animation should run smoothly thereafter. + // The frames we draw here aren't visible because we are essentially just + // painting the screenshot as-is. + if (mode == MODE_COOL_DOWN) { + for (int i = 0; i < DEJANK_FRAMES; i++) { + draw(1.0f); + } + } return true; } |