You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
317 lines
12 KiB
317 lines
12 KiB
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2017 The Qt Company Ltd.
|
|
** Contact: https://www.qt.io/licensing/
|
|
**
|
|
** This file is part of the Qt Graphical Effects module.
|
|
**
|
|
** $QT_BEGIN_LICENSE:LGPL$
|
|
** Commercial License Usage
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
** accordance with the commercial license agreement provided with the
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
|
**
|
|
** GNU Lesser General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU Lesser
|
|
** General Public License version 3 as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.LGPL3 included in the
|
|
** packaging of this file. Please review the following information to
|
|
** ensure the GNU Lesser General Public License version 3 requirements
|
|
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
|
|
**
|
|
** GNU General Public License Usage
|
|
** Alternatively, this file may be used under the terms of the GNU
|
|
** General Public License version 2.0 or (at your option) the GNU General
|
|
** Public license version 3 or any later version approved by the KDE Free
|
|
** Qt Foundation. The licenses are as published by the Free Software
|
|
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
|
|
** included in the packaging of this file. Please review the following
|
|
** information to ensure the GNU General Public License requirements will
|
|
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
|
|
** https://www.gnu.org/licenses/gpl-3.0.html.
|
|
**
|
|
** $QT_END_LICENSE$
|
|
**
|
|
****************************************************************************/
|
|
|
|
import QtQuick 2.12
|
|
import QtGraphicalEffects.private 1.12
|
|
|
|
/*!
|
|
\qmltype RadialBlur
|
|
\inqmlmodule QtGraphicalEffects
|
|
\since QtGraphicalEffects 1.0
|
|
\inherits QtQuick2::Item
|
|
\ingroup qtgraphicaleffects-motion-blur
|
|
\brief Applies directional blur in a circular direction around the items
|
|
center point.
|
|
|
|
Effect creates perceived impression that the source item appears to be
|
|
rotating to the direction of the blur.
|
|
|
|
Other available motionblur effects are
|
|
\l{QtGraphicalEffects::ZoomBlur}{ZoomBlur} and
|
|
\l{QtGraphicalEffects::DirectionalBlur}{DirectionalBlur}.
|
|
|
|
\table
|
|
\header
|
|
\li Source
|
|
\li Effect applied
|
|
\row
|
|
\li \image Original_bug.png
|
|
\li \image RadialBlur_bug.png
|
|
\endtable
|
|
|
|
\note This effect is available when running with OpenGL.
|
|
|
|
\section1 Example Usage
|
|
|
|
The following example shows how to apply the effect.
|
|
\snippet RadialBlur-example.qml example
|
|
*/
|
|
Item {
|
|
id: rootItem
|
|
|
|
/*!
|
|
This property defines the source item that is going to be blurred.
|
|
|
|
\note It is not supported to let the effect include itself, for
|
|
instance by setting source to the effect's parent.
|
|
*/
|
|
property variant source
|
|
|
|
/*!
|
|
This property defines the direction for the blur and at the same time
|
|
the level of blurring. The larger the angle, the more the result becomes
|
|
blurred. The quality of the blur depends on
|
|
\l{RadialBlur::samples}{samples} property. If angle value is large, more
|
|
samples are needed to keep the visual quality at high level.
|
|
|
|
Allowed values are between 0.0 and 360.0. By default the property is set
|
|
to \c 0.0.
|
|
|
|
\table
|
|
\header
|
|
\li Output examples with different angle values
|
|
\li
|
|
\li
|
|
\row
|
|
\li \image RadialBlur_angle1.png
|
|
\li \image RadialBlur_angle2.png
|
|
\li \image RadialBlur_angle3.png
|
|
\row
|
|
\li \b { angle: 0.0 }
|
|
\li \b { angle: 15.0 }
|
|
\li \b { angle: 30.0 }
|
|
\row
|
|
\li \l samples: 24
|
|
\li \l samples: 24
|
|
\li \l samples: 24
|
|
\row
|
|
\li \l horizontalOffset: 0
|
|
\li \l horizontalOffset: 0
|
|
\li \l horizontalOffset: 0
|
|
\row
|
|
\li \l verticalOffset: 0
|
|
\li \l verticalOffset: 0
|
|
\li \l verticalOffset: 0
|
|
\endtable
|
|
*/
|
|
property real angle: 0.0
|
|
|
|
/*!
|
|
This property defines how many samples are taken per pixel when blur
|
|
calculation is done. Larger value produces better quality, but is slower
|
|
to render.
|
|
|
|
This property is not intended to be animated. Changing this property may
|
|
cause the underlying OpenGL shaders to be recompiled.
|
|
|
|
Allowed values are between 0 and inf (practical maximum depends on GPU).
|
|
By default the property is set to \c 0 (no samples).
|
|
|
|
*/
|
|
property int samples: 0
|
|
|
|
/*!
|
|
\qmlproperty real QtGraphicalEffects::RadialBlur::horizontalOffset
|
|
\qmlproperty real QtGraphicalEffects::RadialBlur::verticalOffset
|
|
|
|
These properties define the offset in pixels for the perceived center
|
|
point of the rotation.
|
|
|
|
Allowed values are between -inf and inf.
|
|
By default these properties are set to \c 0.
|
|
|
|
\table
|
|
\header
|
|
\li Output examples with different horizontalOffset values
|
|
\li
|
|
\li
|
|
\row
|
|
\li \image RadialBlur_horizontalOffset1.png
|
|
\li \image RadialBlur_horizontalOffset2.png
|
|
\li \image RadialBlur_horizontalOffset3.png
|
|
\row
|
|
\li \b { horizontalOffset: 75.0 }
|
|
\li \b { horizontalOffset: 0.0 }
|
|
\li \b { horizontalOffset: -75.0 }
|
|
\row
|
|
\li \l samples: 24
|
|
\li \l samples: 24
|
|
\li \l samples: 24
|
|
\row
|
|
\li \l angle: 20
|
|
\li \l angle: 20
|
|
\li \l angle: 20
|
|
\row
|
|
\li \l verticalOffset: 0
|
|
\li \l verticalOffset: 0
|
|
\li \l verticalOffset: 0
|
|
\endtable
|
|
*/
|
|
property real horizontalOffset: 0.0
|
|
property real verticalOffset: 0.0
|
|
|
|
/*!
|
|
This property defines the blur behavior near the edges of the item,
|
|
where the pixel blurring is affected by the pixels outside the source
|
|
edges.
|
|
|
|
If the property is set to \c true, the pixels outside the source are
|
|
interpreted to be transparent, which is similar to OpenGL
|
|
clamp-to-border extension. The blur is expanded slightly outside the
|
|
effect item area.
|
|
|
|
If the property is set to \c false, the pixels outside the source are
|
|
interpreted to contain the same color as the pixels at the edge of the
|
|
item, which is similar to OpenGL clamp-to-edge behavior. The blur does
|
|
not expand outside the effect item area.
|
|
|
|
By default, the property is set to \c false.
|
|
*/
|
|
property bool transparentBorder: false
|
|
|
|
/*!
|
|
This property allows the effect output pixels to be cached in order to
|
|
improve the rendering performance.
|
|
|
|
Every time the source or effect properties are changed, the pixels in
|
|
the cache must be updated. Memory consumption is increased, because an
|
|
extra buffer of memory is required for storing the effect output.
|
|
|
|
It is recommended to disable the cache when the source or the effect
|
|
properties are animated.
|
|
|
|
By default, the property is set to \c false.
|
|
|
|
*/
|
|
property bool cached: false
|
|
|
|
SourceProxy {
|
|
id: sourceProxy
|
|
input: rootItem.source
|
|
sourceRect: shaderItem.transparentBorder ? Qt.rect(-1, -1, parent.width + 2.0, parent.height + 2.0) : Qt.rect(0, 0, 0, 0)
|
|
}
|
|
|
|
ShaderEffectSource {
|
|
id: cacheItem
|
|
anchors.fill: shaderItem
|
|
visible: rootItem.cached
|
|
smooth: true
|
|
sourceItem: shaderItem
|
|
live: true
|
|
hideSource: visible
|
|
}
|
|
|
|
ShaderEffect {
|
|
id: shaderItem
|
|
property variant source: sourceProxy.output
|
|
property variant center: Qt.point(0.5 + rootItem.horizontalOffset / parent.width, 0.5 + rootItem.verticalOffset / parent.height)
|
|
property bool transparentBorder: rootItem.transparentBorder && rootItem.samples > 1
|
|
property int samples: rootItem.samples
|
|
property real weight: 1.0 / Math.max(1.0, rootItem.samples)
|
|
property real angleSin: Math.sin(rootItem.angle/2 * Math.PI/180)
|
|
property real angleCos: Math.cos(rootItem.angle/2 * Math.PI/180)
|
|
property real angleSinStep: Math.sin(-rootItem.angle * Math.PI/180 / Math.max(1.0, rootItem.samples - 1))
|
|
property real angleCosStep: Math.cos(-rootItem.angle * Math.PI/180 / Math.max(1.0, rootItem.samples - 1))
|
|
property variant expandPixels: transparentBorder ? Qt.size(0.5 * parent.height, 0.5 * parent.width) : Qt.size(0,0)
|
|
property variant expand: transparentBorder ? Qt.size(expandPixels.width / width, expandPixels.height / height) : Qt.size(0,0)
|
|
property variant delta: Qt.size(1.0 / rootItem.width, 1.0 / rootItem.height)
|
|
property real w: parent.width
|
|
property real h: parent.height
|
|
|
|
x: transparentBorder ? -expandPixels.width - 1 : 0
|
|
y: transparentBorder ? -expandPixels.height - 1 : 0
|
|
width: transparentBorder ? parent.width + expandPixels.width * 2.0 + 2 : parent.width
|
|
height: transparentBorder ? parent.height + expandPixels.height * 2.0 + 2 : parent.height
|
|
|
|
property string fragmentShaderSkeleton: "
|
|
varying highp vec2 qt_TexCoord0;
|
|
uniform highp float qt_Opacity;
|
|
uniform lowp sampler2D source;
|
|
uniform highp float angleSin;
|
|
uniform highp float angleCos;
|
|
uniform highp float angleSinStep;
|
|
uniform highp float angleCosStep;
|
|
uniform highp float weight;
|
|
uniform highp vec2 expand;
|
|
uniform highp vec2 center;
|
|
uniform highp vec2 delta;
|
|
uniform highp float w;
|
|
uniform highp float h;
|
|
|
|
void main(void) {
|
|
highp mat2 m;
|
|
gl_FragColor = vec4(0.0);
|
|
mediump vec2 texCoord = qt_TexCoord0;
|
|
|
|
PLACEHOLDER_EXPAND_STEPS
|
|
|
|
highp vec2 dir = vec2(texCoord.s * w - w * center.x, texCoord.t * h - h * center.y);
|
|
m[0] = vec2(angleCos, -angleSin);
|
|
m[1] = vec2(angleSin, angleCos);
|
|
dir *= m;
|
|
|
|
m[0] = vec2(angleCosStep, -angleSinStep);
|
|
m[1] = vec2(angleSinStep, angleCosStep);
|
|
|
|
PLACEHOLDER_UNROLLED_LOOP
|
|
|
|
gl_FragColor *= weight * qt_Opacity;
|
|
}
|
|
"
|
|
|
|
function buildFragmentShader() {
|
|
var shader = ""
|
|
if (GraphicsInfo.profile == GraphicsInfo.OpenGLCoreProfile)
|
|
shader += "#version 150 core\n#define varying in\n#define gl_FragColor fragColor\n#define texture2D texture\nout vec4 fragColor;\n"
|
|
shader += fragmentShaderSkeleton
|
|
var expandSteps = ""
|
|
|
|
if (transparentBorder) {
|
|
expandSteps += "texCoord = (texCoord - expand) / (1.0 - 2.0 * expand);"
|
|
}
|
|
|
|
var unrolledLoop = "gl_FragColor += texture2D(source, texCoord);\n"
|
|
|
|
if (rootItem.samples > 1) {
|
|
unrolledLoop = ""
|
|
for (var i = 0; i < rootItem.samples; i++)
|
|
unrolledLoop += "gl_FragColor += texture2D(source, center + dir * delta); dir *= m;\n"
|
|
}
|
|
|
|
shader = shader.replace("PLACEHOLDER_EXPAND_STEPS", expandSteps)
|
|
fragmentShader = shader.replace("PLACEHOLDER_UNROLLED_LOOP", unrolledLoop)
|
|
}
|
|
|
|
onFragmentShaderChanged: sourceChanged()
|
|
onSamplesChanged: buildFragmentShader()
|
|
onTransparentBorderChanged: buildFragmentShader()
|
|
Component.onCompleted: buildFragmentShader()
|
|
}
|
|
}
|