canvas - Passing an image from Java to JavaFX WebView -


i've got application window using javafx. window contains simple webview display html document. inside html document, there script tag, executing java function, returns pixels int[]. i'm using following code draw image onto canvas:

var context = canvas.getcontext('2d'); var imagedata = context.createimagedata(canvas.width, canvas.height); var buffer8 = new uint8clampedarray(imagedata.data.buffer); var buffer32 = new uint32array(imagedata.data.buffer); buffer32.set(pixels); context.putimagedata(imagedata, 0, 0);

this works, performance 0.07 seconds per frame, giving me total of ~ 15 fps, using 640x480 canvas currently. goal @ last 30fps 1920x1080 (currently 5 fps), , higher values. solution come create/populate whole buffer @ once on java side, have no idea how manage that. appreciated.


-

Comments

Post a Comment

Popular posts from this blog

javascript - How do you prevent nested queries/catches in sequelize? -

i think i'm preventing nested queries as possible, i'm not sure. understand calls here can executed in single select query, did simplify example. // example in typescript // find user user.find({where:{username:'user'}}) // if found user .then(function(user) { return user.find({where:{username:'other_user'}}) // if found other_user .then(function(other_user) { // stuff return whatever_i_need } // if went wrong, go straight parent catch .catch(function(err) { // stuff throw new error() } } // if previous .then() returned success .then(function(data) { return user.find({where:{username:'yet_another_user'}}) // if found yet_another_user .then(function(yet_another_user) { // stuff return whatever_i_need_again ...
Read more

java - Could not retrieve pre-bound Hibernate session - Could not obtain transaction-synchronized Session for current thread -

i creating web application spring-mvc, spring-security, spring-core, , hibernate. but non-error hibernate session factory. it throwing hibernateexception, see on log in debug level, , application continues execution no problem. but curious understand reason of exception raised. the log shows following lines. 2016-08-29 13:34:55,310 debug [sg.com.diamond.express.base.dao.impl.hibernatedaoimpl].[doexecute]([328]) [http-nio-8888-exec-4] - not retrieve pre-bound hibernate session org.hibernate.hibernateexception: not obtain transaction-synchronized session current thread @ org.springframework.orm.hibernate4.springsessioncontext.currentsession(springsessioncontext.java:134) @ org.hibernate.internal.sessionfactoryimpl.getcurrentsession(sessionfactoryimpl.java:1014) @ org.springframework.orm.hibernate4.hibernatetemplate.doexecute(hibernatetemplate.java:325) @ org.springframework.orm.hibernate4.hibernatetemplate.executewithnativesession(hibernatetemplate.java:308)...
Read more

ruby on rails - ActiveRecord order not working -

in controller, after reprioritizing "child", lists children in new order: @child.parent.children.sort_by{|g| g.priority } this, surprisingly, doesn't work: @child.parent.children.order(priority: :asc) why doesn't .order work? instead of sorting correctly, it's sorting previous order before operation run, assume it's using cached results (the query run before in operation). how 1 bust cache, if indeed problem? i've tried @child.reload after reprioritizing no avail. if have ordering on children association might try use reorder apply new ordering: @child.parent.children.reorder(priority: :asc)
Read more