Android - Locking Canvas takes too long on some frames
I have a normal game loop in Android Studio written in Java with Threads. Recently, I realized that the value of fps affects on lockCanvas() method. For example, if I set the fps value to 60 lockCanvas() takes 2.5ms, but if I set the value of fps to 1000 same method takes more than 10ms. The fps variable is used only for Thread.sleep(), to maintain stable FPS. Another thing I noticed is that if I don't draw anything on canvas, or don't sleep thread then lockCanvas() method takes as much time as one frame during 60fps (16.67ms)
private final int fps = 1000; // Usually it's 60.
private SurfaceHolder surfaceholder;
private Panel panel;
private boolean running;
private Canvas canvas;
public MainThread(SurfaceHolder surfaceholder, Panel panel) {
super();
this.surfaceholder = surfaceholder;
this.panel = panel;
}
public void Enable() {
running = true;
}
public void Disable() {
running = false;
}
@Override
public void run() {
long updatetime = 1000000000 / fps;
long starttime;
long processtime;
long waittime;
while (running) {
starttime = System.nanoTime();
canvas = null;
try {
synchronized (surfaceholder) {
// Takes about 10ms when the fps value is 1000
canvas = surfaceholder.lockCanvas();
// 7-8ms
panel.ConfigureNextFrame(canvas);
}
} catch (Exception ex) {
} finally {
if (canvas != null) {
// 0.5-1.5ms
surfaceholder.unlockCanvasAndPost(canvas);
}
}
processtime = System.nanoTime() - starttime;
waittime = updatetime - processtime;
try {
if (waittime > 0) {
this.sleep(waittime / 1000000, (int) (waittime % 1000000));
}
} catch (Exception ex) {
}
}
}
I have another question. When I draw 32bit PNG (loaded as Bitmap) on canvas, it takes triple time than drawing 24 or 8 bit PNG instead. Why such strange things happen in Java ? I couldn't find a solution to all this for more than a year! Thanks in advance!
java
android canvas surfaceview frame-rate asked Nov 20 '18 at 20:50
K2oshaK2osha
62
add a comment |
I have a normal game loop in Android Studio written in Java with Threads. Recently, I realized that the value of fps affects on lockCanvas() method. For example, if I set the fps value to 60 lockCanvas() takes 2.5ms, but if I set the value of fps to 1000 same method takes more than 10ms. The fps variable is used only for Thread.sleep(), to maintain stable FPS. Another thing I noticed is that if I don't draw anything on canvas, or don't sleep thread then lockCanvas() method takes as much time as one frame during 60fps (16.67ms)
private final int fps = 1000; // Usually it's 60.
private SurfaceHolder surfaceholder;
private Panel panel;
private boolean running;
private Canvas canvas;
public MainThread(SurfaceHolder surfaceholder, Panel panel) {
super();
this.surfaceholder = surfaceholder;
this.panel = panel;
}
public void Enable() {
running = true;
}
public void Disable() {
running = false;
}
@Override
public void run() {
long updatetime = 1000000000 / fps;
long starttime;
long processtime;
long waittime;
while (running) {
starttime = System.nanoTime();
canvas = null;
try {
synchronized (surfaceholder) {
// Takes about 10ms when the fps value is 1000
canvas = surfaceholder.lockCanvas();
// 7-8ms
panel.ConfigureNextFrame(canvas);
}
} catch (Exception ex) {
} finally {
if (canvas != null) {
// 0.5-1.5ms
surfaceholder.unlockCanvasAndPost(canvas);
}
}
processtime = System.nanoTime() - starttime;
waittime = updatetime - processtime;
try {
if (waittime > 0) {
this.sleep(waittime / 1000000, (int) (waittime % 1000000));
}
} catch (Exception ex) {
}
}
}
I have another question. When I draw 32bit PNG (loaded as Bitmap) on canvas, it takes triple time than drawing 24 or 8 bit PNG instead. Why such strange things happen in Java ? I couldn't find a solution to all this for more than a year! Thanks in advance!
java
android canvas surfaceview frame-rate asked Nov 20 '18 at 20:50
K2oshaK2osha
62
add a comment |
I have a normal game loop in Android Studio written in Java with Threads. Recently, I realized that the value of fps affects on lockCanvas() method. For example, if I set the fps value to 60 lockCanvas() takes 2.5ms, but if I set the value of fps to 1000 same method takes more than 10ms. The fps variable is used only for Thread.sleep(), to maintain stable FPS. Another thing I noticed is that if I don't draw anything on canvas, or don't sleep thread then lockCanvas() method takes as much time as one frame during 60fps (16.67ms)
private final int fps = 1000; // Usually it's 60.
private SurfaceHolder surfaceholder;
private Panel panel;
private boolean running;
private Canvas canvas;
public MainThread(SurfaceHolder surfaceholder, Panel panel) {
super();
this.surfaceholder = surfaceholder;
this.panel = panel;
}
public void Enable() {
running = true;
}
public void Disable() {
running = false;
}
@Override
public void run() {
long updatetime = 1000000000 / fps;
long starttime;
long processtime;
long waittime;
while (running) {
starttime = System.nanoTime();
canvas = null;
try {
synchronized (surfaceholder) {
// Takes about 10ms when the fps value is 1000
canvas = surfaceholder.lockCanvas();
// 7-8ms
panel.ConfigureNextFrame(canvas);
}
} catch (Exception ex) {
} finally {
if (canvas != null) {
// 0.5-1.5ms
surfaceholder.unlockCanvasAndPost(canvas);
}
}
processtime = System.nanoTime() - starttime;
waittime = updatetime - processtime;
try {
if (waittime > 0) {
this.sleep(waittime / 1000000, (int) (waittime % 1000000));
}
} catch (Exception ex) {
}
}
}
I have another question. When I draw 32bit PNG (loaded as Bitmap) on canvas, it takes triple time than drawing 24 or 8 bit PNG instead. Why such strange things happen in Java ? I couldn't find a solution to all this for more than a year! Thanks in advance!
java
android canvas surfaceview frame-rate asked Nov 20 '18 at 20:50
K2oshaK2osha
62
I have a normal game loop in Android Studio written in Java with Threads. Recently, I realized that the value of fps affects on lockCanvas() method. For example, if I set the fps value to 60 lockCanvas() takes 2.5ms, but if I set the value of fps to 1000 same method takes more than 10ms. The fps variable is used only for Thread.sleep(), to maintain stable FPS. Another thing I noticed is that if I don't draw anything on canvas, or don't sleep thread then lockCanvas() method takes as much time as one frame during 60fps (16.67ms)
private final int fps = 1000; // Usually it's 60.
private SurfaceHolder surfaceholder;
private Panel panel;
private boolean running;
private Canvas canvas;
public MainThread(SurfaceHolder surfaceholder, Panel panel) {
super();
this.surfaceholder = surfaceholder;
this.panel = panel;
}
public void Enable() {
running = true;
}
public void Disable() {
running = false;
}
@Override
public void run() {
long updatetime = 1000000000 / fps;
long starttime;
long processtime;
long waittime;
while (running) {
starttime = System.nanoTime();
canvas = null;
try {
synchronized (surfaceholder) {
// Takes about 10ms when the fps value is 1000
canvas = surfaceholder.lockCanvas();
// 7-8ms
panel.ConfigureNextFrame(canvas);
}
} catch (Exception ex) {
} finally {
if (canvas != null) {
// 0.5-1.5ms
surfaceholder.unlockCanvasAndPost(canvas);
}
}
processtime = System.nanoTime() - starttime;
waittime = updatetime - processtime;
try {
if (waittime > 0) {
this.sleep(waittime / 1000000, (int) (waittime % 1000000));
}
} catch (Exception ex) {
}
}
}
I have another question. When I draw 32bit PNG (loaded as Bitmap) on canvas, it takes triple time than drawing 24 or 8 bit PNG instead. Why such strange things happen in Java ? I couldn't find a solution to all this for more than a year! Thanks in advance!
java
android canvas surfaceview frame-rate java
android canvas surfaceview frame-rate asked Nov 20 '18 at 20:50
K2oshaK2osha
62
asked Nov 20 '18 at 20:50
K2oshaK2osha
62
asked Nov 20 '18 at 20:50
K2oshaK2osha
62
asked Nov 20 '18 at 20:50
K2oshaK2osha
62
asked Nov 20 '18 at 20:50
K2oshaK2osha
62
62
add a comment |
add a comment |
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