Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
For anyone that comes across this in the future, the solution I wound up implementing is basically not rotating text constantly, but only by discrete values when the rotation angle passes a certain limit, ie a rough example would be, if it's 45 degrees, rotate text by 90, -45 , rotate by-90, so that it doesn't fill up the cache with a bazillion instances drawn at slightly different angles. It's not as pretty as before, but now the cache is not being thrashed, so will end up being prettier in the end :) Thanks again to Romain and Dianne for replying, I really appreciate your presence on these forums, and not just on this post, it's a big help. On Mon, Jun 20, 2011 at 9:47 PM, Dianne Hackborn hack...@android.comwrote: Yes, that will do it. Note that each angle you draw a glyph at needs a new entry in the cache for the bitmap of the glyph drawn at that angle. On Mon, Jun 20, 2011 at 6:42 PM, Adam Ratana adam.rat...@gmail.comwrote: After seeing this response, I spent some time to figure out exactly what I was doing now that was causing this to appear in the logs so much. I was puzzled because I wasn't using many styles or colors, the same font, same color. I turned off alpha blending, and removed all the items I was drawing until I was left with 1, and it was still overloading the cache. I narrowed it down to doing: canvas.save(); canvas.rotate(rotationAngle, p.x, p.y); // this is the offending line canvas.drawText(text, p.x, p.y, paint); canvas.restore(); If I rotate and then draw text (this is an AR type implementation where the text is rotating with the phone), this is where the font cache fills up, with just 1 static piece of text. Commenting out the above line doesn't. Even with a large number of text items, NOT rotating the canvas before drawing the text, doesn't fill the cache. This seems kind of strange to me that this would fill the cache, but, is there another way to do this to not fill the cache? On Mon, Jun 20, 2011 at 7:43 PM, Dianne Hackborn hack...@android.comwrote: Well having it printed every second or so indicates you are pretty severely thrashing the cache, which can certainly impact performance. For example drawing your UI may not be fitting in the cache so each frame you draw requires re-rendering glyphs back in to the cache. If that is the case, look at doing things like reducing the number of distinct font sizes or families/styles you are using to have less impact on the cache. -- Adam Ratana adam.rat...@gmail.com -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Adam Ratana adam.rat...@gmail.com -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
Thank you for responding; it seems to be freeing up quite often, probably several to more than several meg of memory a second (if the numbers are right), depending on how often the view is invalidated. I know we are working with limited heap space, is this something we can optimize in our implementation or should we not be concerned at all? Most of the text is the same, but could be generated with new string instances for example. Thanks, Adam On Monday, June 20, 2011 12:58:03 AM UTC-4, Dianne Hackborn wrote: It just means it needs to flush old data from the font cache. You may see this a lot if you are for example drawing at a large number of sizes, as you fill up the font cache with glyphs in a lot of sizes and old glyphs need to be removed to make room. On Sun, Jun 19, 2011 at 9:17 PM, Adam Ratana adam@gmail.com wrote: Hello, I am noticing the same with an implementation for some new functionality I'm experimenting with. I am doing a lot of canvas.drawText calls on a custom View canvas, using the system font though. Are you doing canvas.drawText a lot, Samuh? Also a bump in case anyone reading has knowledge on this subject. Wondering am I doing something stupid here, trying to avoid jankiness. On Wednesday, June 1, 2011 2:10:27 PM UTC-4, Samuh wrote: We are using four different custom fonts across our app. These files are bundled in Assets and are opened in onCreate of every Activity. While studying the logs of our app we keep observing the following log from Skia decoder. 01-01 19:19:51.585: DEBUG/skia(1510): purging 197K from font cache [20 entries] What does the above mean? And how does it affect performance? Is it desirable? Thanks. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-d...@googlegroups.com To unsubscribe from this group, send email to android-develop...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hac...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
Skia's font cache doesn't count towards your heap limit. On Sun, Jun 19, 2011 at 11:19 PM, Adam Ratana adam.rat...@gmail.com wrote: Thank you for responding; it seems to be freeing up quite often, probably several to more than several meg of memory a second (if the numbers are right), depending on how often the view is invalidated. I know we are working with limited heap space, is this something we can optimize in our implementation or should we not be concerned at all? Most of the text is the same, but could be generated with new string instances for example. Thanks, Adam On Monday, June 20, 2011 12:58:03 AM UTC-4, Dianne Hackborn wrote: It just means it needs to flush old data from the font cache. You may see this a lot if you are for example drawing at a large number of sizes, as you fill up the font cache with glyphs in a lot of sizes and old glyphs need to be removed to make room. On Sun, Jun 19, 2011 at 9:17 PM, Adam Ratana adam@gmail.com wrote: Hello, I am noticing the same with an implementation for some new functionality I'm experimenting with. I am doing a lot of canvas.drawText calls on a custom View canvas, using the system font though. Are you doing canvas.drawText a lot, Samuh? Also a bump in case anyone reading has knowledge on this subject. Wondering am I doing something stupid here, trying to avoid jankiness. On Wednesday, June 1, 2011 2:10:27 PM UTC-4, Samuh wrote: We are using four different custom fonts across our app. These files are bundled in Assets and are opened in onCreate of every Activity. While studying the logs of our app we keep observing the following log from Skia decoder. 01-01 19:19:51.585: DEBUG/skia(1510): purging 197K from font cache [20 entries] What does the above mean? And how does it affect performance? Is it desirable? Thanks. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-d...@googlegroups.com To unsubscribe from this group, send email to android-develop...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hac...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Romain Guy Android framework engineer romain...@android.com Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
Thanks for the speedy replies Romain and Diane. I take it now that we should not worry about it, beyond the typical known concerns for real-time drawing and rendering, etc. Appreciated -- Adam On Monday, June 20, 2011 2:22:14 AM UTC-4, Romain Guy (Google) wrote: Skia's font cache doesn't count towards your heap limit. On Sun, Jun 19, 2011 at 11:19 PM, Adam Ratana adam@gmail.com wrote: Thank you for responding; it seems to be freeing up quite often, probably several to more than several meg of memory a second (if the numbers are right), depending on how often the view is invalidated. I know we are working with limited heap space, is this something we can optimize in our implementation or should we not be concerned at all? Most of the text is the same, but could be generated with new string instances for example. Thanks, Adam On Monday, June 20, 2011 12:58:03 AM UTC-4, Dianne Hackborn wrote: It just means it needs to flush old data from the font cache. You may see this a lot if you are for example drawing at a large number of sizes, as you fill up the font cache with glyphs in a lot of sizes and old glyphs need to be removed to make room. On Sun, Jun 19, 2011 at 9:17 PM, Adam Ratana adam...@gmail.com wrote: Hello, I am noticing the same with an implementation for some new functionality I'm experimenting with. I am doing a lot of canvas.drawText calls on a custom View canvas, using the system font though. Are you doing canvas.drawText a lot, Samuh? Also a bump in case anyone reading has knowledge on this subject. Wondering am I doing something stupid here, trying to avoid jankiness. On Wednesday, June 1, 2011 2:10:27 PM UTC-4, Samuh wrote: We are using four different custom fonts across our app. These files are bundled in Assets and are opened in onCreate of every Activity. While studying the logs of our app we keep observing the following log from Skia decoder. 01-01 19:19:51.585: DEBUG/skia(1510): purging 197K from font cache [20 entries] What does the above mean? And how does it affect performance? Is it desirable? Thanks. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to androi...@googlegroups.com To unsubscribe from this group, send email to android-d...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hac...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-d...@googlegroups.com To unsubscribe from this group, send email to android-develop...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Romain Guy Android framework engineer roma...@android.com Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
Well having it printed every second or so indicates you are pretty severely thrashing the cache, which can certainly impact performance. For example drawing your UI may not be fitting in the cache so each frame you draw requires re-rendering glyphs back in to the cache. If that is the case, look at doing things like reducing the number of distinct font sizes or families/styles you are using to have less impact on the cache. On Sun, Jun 19, 2011 at 11:33 PM, Adam Ratana adam.rat...@gmail.com wrote: Thanks for the speedy replies Romain and Diane. I take it now that we should not worry about it, beyond the typical known concerns for real-time drawing and rendering, etc. Appreciated -- Adam On Monday, June 20, 2011 2:22:14 AM UTC-4, Romain Guy (Google) wrote: Skia's font cache doesn't count towards your heap limit. On Sun, Jun 19, 2011 at 11:19 PM, Adam Ratana adam@gmail.com wrote: Thank you for responding; it seems to be freeing up quite often, probably several to more than several meg of memory a second (if the numbers are right), depending on how often the view is invalidated. I know we are working with limited heap space, is this something we can optimize in our implementation or should we not be concerned at all? Most of the text is the same, but could be generated with new string instances for example. Thanks, Adam On Monday, June 20, 2011 12:58:03 AM UTC-4, Dianne Hackborn wrote: It just means it needs to flush old data from the font cache. You may see this a lot if you are for example drawing at a large number of sizes, as you fill up the font cache with glyphs in a lot of sizes and old glyphs need to be removed to make room. On Sun, Jun 19, 2011 at 9:17 PM, Adam Ratana adam...@gmail.com wrote: Hello, I am noticing the same with an implementation for some new functionality I'm experimenting with. I am doing a lot of canvas.drawText calls on a custom View canvas, using the system font though. Are you doing canvas.drawText a lot, Samuh? Also a bump in case anyone reading has knowledge on this subject. Wondering am I doing something stupid here, trying to avoid jankiness. On Wednesday, June 1, 2011 2:10:27 PM UTC-4, Samuh wrote: We are using four different custom fonts across our app. These files are bundled in Assets and are opened in onCreate of every Activity. While studying the logs of our app we keep observing the following log from Skia decoder. 01-01 19:19:51.585: DEBUG/skia(1510): purging 197K from font cache [20 entries] What does the above mean? And how does it affect performance? Is it desirable? Thanks. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to androi...@googlegroups.com To unsubscribe from this group, send email to android-d...@googlegroups.com For more options, visit this group at http://groups.google.com/**group/android-developers?hl=enhttp://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hac...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-d...@googlegroups.com To unsubscribe from this group, send email to android-develop...@**googlegroups.com For more options, visit this group at http://groups.google.com/**group/android-developers?hl=enhttp://groups.google.com/group/android-developers?hl=en -- Romain Guy Android framework engineer roma...@android.com Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group,
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
After seeing this response, I spent some time to figure out exactly what I was doing now that was causing this to appear in the logs so much. I was puzzled because I wasn't using many styles or colors, the same font, same color. I turned off alpha blending, and removed all the items I was drawing until I was left with 1, and it was still overloading the cache. I narrowed it down to doing: canvas.save(); canvas.rotate(rotationAngle, p.x, p.y); // this is the offending line canvas.drawText(text, p.x, p.y, paint); canvas.restore(); If I rotate and then draw text (this is an AR type implementation where the text is rotating with the phone), this is where the font cache fills up, with just 1 static piece of text. Commenting out the above line doesn't. Even with a large number of text items, NOT rotating the canvas before drawing the text, doesn't fill the cache. This seems kind of strange to me that this would fill the cache, but, is there another way to do this to not fill the cache? On Mon, Jun 20, 2011 at 7:43 PM, Dianne Hackborn hack...@android.comwrote: Well having it printed every second or so indicates you are pretty severely thrashing the cache, which can certainly impact performance. For example drawing your UI may not be fitting in the cache so each frame you draw requires re-rendering glyphs back in to the cache. If that is the case, look at doing things like reducing the number of distinct font sizes or families/styles you are using to have less impact on the cache. -- Adam Ratana adam.rat...@gmail.com -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
Yes, that will do it. Note that each angle you draw a glyph at needs a new entry in the cache for the bitmap of the glyph drawn at that angle. On Mon, Jun 20, 2011 at 6:42 PM, Adam Ratana adam.rat...@gmail.com wrote: After seeing this response, I spent some time to figure out exactly what I was doing now that was causing this to appear in the logs so much. I was puzzled because I wasn't using many styles or colors, the same font, same color. I turned off alpha blending, and removed all the items I was drawing until I was left with 1, and it was still overloading the cache. I narrowed it down to doing: canvas.save(); canvas.rotate(rotationAngle, p.x, p.y); // this is the offending line canvas.drawText(text, p.x, p.y, paint); canvas.restore(); If I rotate and then draw text (this is an AR type implementation where the text is rotating with the phone), this is where the font cache fills up, with just 1 static piece of text. Commenting out the above line doesn't. Even with a large number of text items, NOT rotating the canvas before drawing the text, doesn't fill the cache. This seems kind of strange to me that this would fill the cache, but, is there another way to do this to not fill the cache? On Mon, Jun 20, 2011 at 7:43 PM, Dianne Hackborn hack...@android.comwrote: Well having it printed every second or so indicates you are pretty severely thrashing the cache, which can certainly impact performance. For example drawing your UI may not be fitting in the cache so each frame you draw requires re-rendering glyphs back in to the cache. If that is the case, look at doing things like reducing the number of distinct font sizes or families/styles you are using to have less impact on the cache. -- Adam Ratana adam.rat...@gmail.com -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] skia / purging [x]k from font cache [y entries] - what does it mean? was Re: Custom Fonts
It just means it needs to flush old data from the font cache. You may see this a lot if you are for example drawing at a large number of sizes, as you fill up the font cache with glyphs in a lot of sizes and old glyphs need to be removed to make room. On Sun, Jun 19, 2011 at 9:17 PM, Adam Ratana adam.rat...@gmail.com wrote: Hello, I am noticing the same with an implementation for some new functionality I'm experimenting with. I am doing a lot of canvas.drawText calls on a custom View canvas, using the system font though. Are you doing canvas.drawText a lot, Samuh? Also a bump in case anyone reading has knowledge on this subject. Wondering am I doing something stupid here, trying to avoid jankiness. On Wednesday, June 1, 2011 2:10:27 PM UTC-4, Samuh wrote: We are using four different custom fonts across our app. These files are bundled in Assets and are opened in onCreate of every Activity. While studying the logs of our app we keep observing the following log from Skia decoder. 01-01 19:19:51.585: DEBUG/skia(1510): purging 197K from font cache [20 entries] What does the above mean? And how does it affect performance? Is it desirable? Thanks. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
