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[Android] Add setPreferredFramesPerSecond for MapView (#13498)

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* [Android] Add setPreferredFramesPerSecond for MapView
This commit is contained in:
Kevin Li
2018-12-12 09:15:55 +08:00
committed by GitHub
parent d812babecd
commit 2d527c2af7
5 changed files with 73 additions and 8 deletions
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12
platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/MapView.java
View File

@@ -421,6 +421,18 @@ public class MapView extends FrameLayout implements NativeMapView.ViewCallback {
}
}
/**
* The maximum frame rate at which the map view is rendered,
* but it can't excess the ability of device hardware.
*
* @param maximumFps Can be set to arbitrary integer values.
*/
public void setMaximumFps(int maximumFps) {
if (mapRenderer != null) {
mapRenderer.setMaximumFps(maximumFps);
}
}
/**
* Returns if the map has been destroyed.
* <p>

34
platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/renderer/MapRenderer.java
View File

@@ -27,6 +27,7 @@ public abstract class MapRenderer implements MapRendererScheduler {
// Holds the pointer to the native peer after initialisation
private long nativePtr = 0;
private double expectedRenderTime = 0;
private MapboxMap.OnFpsChangedListener onFpsChangedListener;
public MapRenderer(@NonNull Context context, String localIdeographFontFamily) {
@@ -75,11 +76,20 @@ public abstract class MapRenderer implements MapRendererScheduler {
@CallSuper
protected void onDrawFrame(GL10 gl) {
long startTime = System.nanoTime();
try {
nativeRender();
} catch (java.lang.Error error) {
Logger.e(TAG, error.getMessage());
}
long renderTime = System.nanoTime() - startTime;
if (renderTime < expectedRenderTime) {
try {
Thread.sleep((long) ((expectedRenderTime - renderTime) / 1E6));
} catch (InterruptedException ex) {
Logger.e(TAG, ex.getMessage());
}
}
if (onFpsChangedListener != null) {
updateFps();
}
@@ -115,18 +125,26 @@ public abstract class MapRenderer implements MapRendererScheduler {
private native void nativeRender();
private long frames;
private long timeElapsed;
private void updateFps() {
frames++;
long currentTime = System.nanoTime();
double fps = 0;
if (currentTime - timeElapsed >= 1) {
fps = frames / ((currentTime - timeElapsed) / 1E9);
onFpsChangedListener.onFpsChanged(fps);
timeElapsed = currentTime;
frames = 0;
double fps = 1E9 / ((currentTime - timeElapsed));
onFpsChangedListener.onFpsChanged(fps);
timeElapsed = currentTime;
}
/**
* The max frame rate at which this render is rendered,
* but it can't excess the ability of device hardware.
*
* @param maximumFps Can be set to arbitrary integer values.
*/
public void setMaximumFps(int maximumFps) {
if (maximumFps <= 0) {
// Not valid, just return
return;
}
expectedRenderTime = 1E9 / maximumFps;
}
}