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List: openjdk-2d-dev
Subject: Re: [OpenJDK 2D-Dev] <AWT Dev> Review request for 8029339 Custom MultiResolution image support on Hi
From: Alan Snyder <javalists () cbfiddle ! com>
Date: 2015-07-15 15:44:28
Message-ID: E7D839C2-FE71-450C-8D78-780A395FFB52 () cbfiddle ! com
[Download RAW message or body]
I am commenting on your suggestion that I can determine which display the image will \
displayed on.
> On Jul 15, 2015, at 7:42 AM, Alexander Scherbatiy <alexandr.scherbatiy@oracle.com> \
> wrote:
> On 7/15/2015 5:09 PM, Alan Snyder wrote:
> >
> > It seems you are making an assumption that the code that creates the image is \
> > somehow initiated from a paint method so that the display scale factor can be \
> > obtained from the graphics context and used to determine the required image \
> > resolution. That is not the scenario I am concerned about.
> The information about screen devices are available from the GraphicsEnvironment.
> Something like:
> ----------------------
> public static void main(String[] args) {
> GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
> for(GraphicsDevice device: ge.getScreenDevices()){
> for(GraphicsConfiguration config: device.getConfigurations()){
> if(!config.getDefaultTransform().isIdentity()){
> System.out.println("Start high-resolution image loading");
> }
> }
> }
> }
> ----------------------
>
> Thanks,
> Alexandr.
> >
> >
> > I am talking about what I would consider a common case: a program that was \
> > written before the concept of HiDPI displays existed and is being adapted to \
> > support HiDPI displays. In this case, because the image creation is potentially a \
> > long running process, the program is written to use a background thread to create \
> > the image. Once the image is created, it is stored somewhere that can be accessed \
> > by a painting method of a component. Prior to the image becoming available, the \
> > component will paint some default background or perhaps paint a default image.
> > I do not want to rearchitect the program to support HiDPI displays. Using the \
> > display scale information for the available displays, I could create a \
> > multiresolution image in the background thread that either contains multiple \
> > images for all available displays or contains one image at the maximum required \
> > resolution of the available displays. However, these solutions are non-optimal. \
> > Either images may be created that will never be used or image scaling may be used \
> > to reduce the resolution, which may result in a lower quality image.
> > What I would like to do is create a multiresolution image that tells my code what \
> > resolution image is needed and allows me to create that image on a background \
> > thread. In additional to solving the HiDPI problem optimally, this solution would \
> > support less common cases, such as displays added to the system at run time and \
> > graphics contexts that are scaled for some reason other than supporting a HiDPI \
> > display.
> > I am assuming this capability already exists to support toolkit images. It would \
> > be nice to make that capability available to applications.
> > Alan
> >
> >
> > > On Jul 15, 2015, at 4:07 AM, Alexander Scherbatiy \
> > > <alexandr.scherbatiy@oracle.com <mailto:alexandr.scherbatiy@oracle.com> \
> > > <mailto:alexandr.scherbatiy@oracle.com \
> > > <mailto:alexandr.scherbatiy@oracle.com>>> wrote:
> > > On 7/14/2015 3:18 AM, Alan Snyder wrote:
> > > > I have a concern about how custom multiresolution images are supported based \
> > > > on a problem I ran into using the JDK 8 classes, which are similar.
> > > > The problem is that the selection of a variant image happens during painting. \
> > > > That is a very bad time to actually try to render an image, if one is in a \
> > > > situation where images of arbitrary resolution can be produced by rendering.
> > > > If I have code now that uses a background thread to create an image in this \
> > > > manner, how can I support HiDPI displays? Creating a multiresolution image \
> > > > defeats the purpose of using a background thread if it defers rendering until \
> > > > paint time. It seems that the best I can do is to guess what resolutions \
> > > > might be wanted and generate them all in advance or, alternatively, generate \
> > > > the highest resolution I expect to need, and have the graphics system scale \
> > > > it down for lower resolutions when requested. Neither of these alternatives \
> > > > is optimal.
> > > JDK 9 has the fix that includes the scale factor in the GraphicsConfiguration \
> > > default transform: http://hg.openjdk.java.net/jdk9/client/jdk/rev/661136704d07
> > > It is possible to iterate over all graphics devices, decide on which device the \
> > > image is supposed to be rendered and generate an image resolution according to \
> > > the scale factor from the device graphics configuration.
> > > Thanks,
> > > Alexandr.
> > >
> > > >
> > > > Although the Image class does allow images to be produced in the background, \
> > > > that API is way too complex for use by an application, and the supporting \
> > > > code for Toolkit images is not accessible.
> > > > It would be nice to have a simple way to return an image that is produced in \
> > > > the background. Something like Future<Image>?
> > > > Alan
[Attachment #3 (unknown)]
<html><head><meta http-equiv="Content-Type" content="text/html \
charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: \
space; -webkit-line-break: after-white-space;" class="">I am commenting on your \
suggestion that I can determine which display the image will displayed on.<div \
class=""><br class=""></div><div class=""><br class=""></div><div class=""><br \
class=""><div><blockquote type="cite" class=""><div class="">On Jul 15, 2015, at 7:42 \
AM, Alexander Scherbatiy <<a href="mailto:alexandr.scherbatiy@oracle.com" \
class="">alexandr.scherbatiy@oracle.com</a>> wrote:</div><br \
class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; \
font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; \
letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; \
text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline \
!important;" class="">On 7/15/2015 5:09 PM, Alan Snyder wrote:</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" \
class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; \
font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: \
normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; \
text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; \
-webkit-text-stroke-width: 0px;" class=""><br class="">It seems you are making an \
assumption that the code that creates the image is somehow initiated from a paint \
method so that the display scale factor can be obtained from the graphics context and \
used to determine the required image resolution. That is not the scenario I am \
concerned about.<br class=""><br class=""></blockquote><span style="font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: \
normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline \
!important;" class=""> The information about screen devices are available \
from the GraphicsEnvironment.</span><br style="font-family: Helvetica; font-size: \
12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: \
normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; \
text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; \
-webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; \
font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; \
letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; \
text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline \
!important;" class=""> Something like:</span><br style="font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: \
normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" class=""> ----------------------</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" class=""> public static void \
main(String[] args) {</span><br style="font-family: Helvetica; font-size: 12px; \
font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: \
normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; \
text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; \
-webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; \
font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; \
letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; \
text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline \
!important;" class=""> GraphicsEnvironment \
ge = GraphicsEnvironment.getLocalGraphicsEnvironment();</span><br style="font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: \
normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" \
class=""> for(GraphicsDevice device: \
ge.getScreenDevices()){</span><br style="font-family: Helvetica; font-size: 12px; \
font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: \
normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; \
text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; \
-webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; \
font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; \
letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; \
text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline \
!important;" class=""> for(GraphicsConfiguration \
config: device.getConfigurations()){</span><br style="font-family: Helvetica; \
font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; \
letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; \
text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" \
class=""> if(!config.getDefaultTransform().isIdentity()){</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" \
class=""> System.out.println("Start \
high-resolution image loading");</span><br style="font-family: Helvetica; font-size: \
12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: \
normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; \
text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; \
-webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; \
font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; \
letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; \
text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline \
!important;" class=""> }</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" \
class=""> }</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" \
class=""> }</span><br style="font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: \
normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" class=""> }</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" class=""> ----------------------</span><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" class=""> Thanks,</span><br style="font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: \
normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; \
display: inline !important;" class=""> Alexandr.</span><br style="font-family: \
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: \
normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: \
start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; \
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" \
style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: \
normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: \
auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; \
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br \
class=""><br class="">I am talking about what I would consider a common case: a \
program that was written before the concept of HiDPI displays existed and is being \
adapted to support HiDPI displays. In this case, because the image creation is \
potentially a long running process, the program is written to use a background thread \
to create the image. Once the image is created, it is stored somewhere that can be \
accessed by a painting method of a component. Prior to the image becoming available, \
the component will paint some default background or perhaps paint a default image.<br \
class=""><br class="">I do not want to rearchitect the program to support HiDPI \
displays. Using the display scale information for the available displays, I could \
create a multiresolution image in the background thread that either contains multiple \
images for all available displays or contains one image at the maximum required \
resolution of the available displays. However, these solutions are non-optimal. \
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