StackOverflow2013

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plurals

PO
primarykey
Id
8927361
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-01-19T14:03:29.570
FavoriteCount
0
LastActivityDate
2012-10-25T16:20:45.697
LastEditDate
2012-10-25T16:20:45.697
LastEditorUserId
20107
OwnerUserId
137386
ParentId
8894244
PostTypeId
2
Score
13
ViewCount
0
LastEditorDisplayName
text
Body
The <code>effect</code> attribute, wich all visual QML items have, accepts all the effects which are subclasses of <code>QGraphicsEffect</code>. Qt 4.8 ships with <code>QGraphicsBlurEffect</code>, <code>QGraphicsColorizeEffect</code>, <code>QGraphicsDropShadowEffect</code>, and <code>QGraphicsOpacityEffect</code>. Originally these there all available in QML by default, but at one time in development (before the first public release of QtQuick) they were excluded for performance reasons. To make them work again, one has to include the following lines of code in the C++ part of his application, for instance in the <code>main</code> function: <pre><code>qmlRegisterType<QGraphicsBlurEffect>("Effects",1,0,"Blur"); qmlRegisterType<QGraphicsColorizeEffect>("Effects",1,0,"Colorize"); qmlRegisterType<QGraphicsDropShadowEffect>("Effects",1,0,"DropShadow"); qmlRegisterType<QGraphicsOpacityEffect>("Effects",1,0,"OpacityEffect"); </code></pre> This make these classes available to QML so one can use them like: <pre><code>import QtQuick 1.1 import Effects 1.0 Item { // [...] effect: Blur { blurRadius: 10.0 } } </code></pre> This works, but in many case the resulting performance is really unacceptable. Then you should try to implement blurring with the help of <a href="http://doc.qt.nokia.com/4.8-snapshot/qml-shadereffectitem.html"><code>ShaderEffectItem</code></a>. That way one can realize graphic effects with GLSL shader programs resulting in GPU rendering which is way faster than the old <code>QGraphicsEffect</code>-based approach. 
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1. POQml and blurring image
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USAurélien Gâteau
UserOwnerUserId
1. USsebasgo
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1. POQml and blurring image
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1. VO
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2. VO
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3. VO
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