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 :-)


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