opengl - Qt Use ShaderEffect for QImage rendering -


i wondering if possible via qt quick or c++ use shader effect on image , save effect applied.

the reason doing achieve opengl assisted image effect manipulation (ie. emboss, pixelize, etc)

i tried this:

import qtquick 2.4 import qtquick.controls 1.3 import qtquick.dialogs 1.2  applicationwindow {     id: root     title: qstr("hello world")     width: 640     height: 480     visible: true      image {         id: effectimage         width: 200         height: 200         sourcesize.width: width         sourcesize.height: height          anchors.centerin: parent         source: "qrc:/myimage.png"         layer.enabled: true         layer.effect: shadereffect {             fragmentshader: "                 uniform lowp sampler2d source; // item                 uniform lowp float qt_opacity; // inherited opacity of item                 varying highp vec2 qt_texcoord0;                 void main() {                     lowp vec4 p = texture2d(source, qt_texcoord0);                     lowp float g = dot(p.xyz, vec3(0.344, 0.5, 0.156));                     gl_fragcolor = vec4(g, g, g, p.a) * qt_opacity;                 }"         }     }     button {         id: grabit         anchors.top: effectimage.bottom         text: qstr("grab")         onclicked: {             effectimage.grabtoimage(function(result) {                 console.debug("hallo");                 result.savetofile("test.jpg","jpg");             });         }     } }

applying simple grayscale effect on image. works on-screen, grabtoimage() not apply effect.

is there way this?

ok easy, solved problem wrapping image item element , grabbing image instead:

    import qtquick 2.4 import qtquick.controls 1.3 import qtquick.dialogs 1.2  applicationwindow {     id: root     title: qstr("hello world")     width: 640     height: 480     visible: true      item {         id: effectimage         width: 200         height: 200         anchors.centerin: parent         image {             anchors.fill: parent             sourcesize.width: width             sourcesize.height: height             source: "qrc:/myimage.png"             layer.enabled: true             layer.effect: shadereffect {                 fragmentshader: "                     uniform lowp sampler2d source; // item                     uniform lowp float qt_opacity; // inherited opacity of item                     varying highp vec2 qt_texcoord0;                     void main() {                         lowp vec4 p = texture2d(source, qt_texcoord0);                         lowp float g = dot(p.xyz, vec3(0.344, 0.5, 0.156));                         gl_fragcolor = vec4(g, g, g, p.a) * qt_opacity;                     }"             }         }     }     button {         id: grabit         anchors.top: effectimage.bottom         text: qstr("grab")         onclicked: {             effectimage.grabtoimage(function(result) {                 console.debug("hallo");                 result.savetofile("test.jpg","jpg");             });         }     } }

hope helps else :-)


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:...
Read more