195 lines
6.3 KiB
QML
195 lines
6.3 KiB
QML
/****************************************************************************
|
|
**
|
|
** 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 BrightnessContrast
|
|
\inqmlmodule QtGraphicalEffects
|
|
\since QtGraphicalEffects 1.0
|
|
\inherits QtQuick2::Item
|
|
\ingroup qtgraphicaleffects-color
|
|
\brief Adjusts brightness and contrast.
|
|
|
|
This effect adjusts the source item colors.
|
|
Brightness adjustment changes the perceived luminance of the source item.
|
|
Contrast adjustment increases or decreases the color
|
|
and brightness variations.
|
|
|
|
\table
|
|
\header
|
|
\li Source
|
|
\li Effect applied
|
|
\row
|
|
\li \image Original_bug.png
|
|
\li \image BrightnessContrast_bug.png
|
|
\endtable
|
|
|
|
\note This effect is available when running with OpenGL.
|
|
|
|
\section1 Example
|
|
|
|
The following example shows how to apply the effect.
|
|
\snippet BrightnessContrast-example.qml example
|
|
|
|
*/
|
|
Item {
|
|
id: rootItem
|
|
|
|
/*!
|
|
This property defines the source item that provides the source pixels
|
|
for the effect.
|
|
|
|
\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 how much the source brightness is increased or
|
|
decreased.
|
|
|
|
The value ranges from -1.0 to 1.0. By default, the property is set to \c
|
|
0.0 (no change).
|
|
|
|
\table
|
|
\header
|
|
\li Output examples with different brightness values
|
|
\li
|
|
\li
|
|
\row
|
|
\li \image BrightnessContrast_brightness1.png
|
|
\li \image BrightnessContrast_brightness2.png
|
|
\li \image BrightnessContrast_brightness3.png
|
|
\row
|
|
\li \b { brightness: -0.25 }
|
|
\li \b { brightness: 0 }
|
|
\li \b { brightness: 0.5 }
|
|
\row
|
|
\li \l contrast: 0
|
|
\li \l contrast: 0
|
|
\li \l contrast: 0
|
|
\endtable
|
|
|
|
*/
|
|
property real brightness: 0.0
|
|
|
|
/*!
|
|
This property defines how much the source contrast is increased or
|
|
decreased. The decrease of the contrast is linear, but the increase is
|
|
applied with a non-linear curve to allow very high contrast adjustment at
|
|
the high end of the value range.
|
|
|
|
\table
|
|
\header
|
|
\li Contrast adjustment curve
|
|
\row
|
|
\li \image BrightnessContrast_contrast_graph.png
|
|
\endtable
|
|
|
|
The value ranges from -1.0 to 1.0. By default, the property is set to \c 0.0 (no change).
|
|
|
|
\table
|
|
\header
|
|
\li Output examples with different contrast values
|
|
\li
|
|
\li
|
|
\row
|
|
\li \image BrightnessContrast_contrast1.png
|
|
\li \image BrightnessContrast_contrast2.png
|
|
\li \image BrightnessContrast_contrast3.png
|
|
\row
|
|
\li \b { contrast: -0.5 }
|
|
\li \b { contrast: 0 }
|
|
\li \b { contrast: 0.5 }
|
|
\row
|
|
\li \l brightness: 0
|
|
\li \l brightness: 0
|
|
\li \l brightness: 0
|
|
\endtable
|
|
|
|
*/
|
|
property real contrast: 0.0
|
|
|
|
/*!
|
|
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
|
|
interpolation: rootItem.smooth || (rootItem.layer.enabled && rootItem.layer.smooth)
|
|
? SourceProxy.NearestInterpolation : SourceProxy.LinearInterpolation
|
|
}
|
|
|
|
ShaderEffectSource {
|
|
id: cacheItem
|
|
anchors.fill: parent
|
|
visible: rootItem.cached
|
|
smooth: true
|
|
sourceItem: shaderItem
|
|
live: true
|
|
hideSource: visible
|
|
}
|
|
|
|
ShaderEffect {
|
|
id: shaderItem
|
|
property variant source: sourceProxy.output
|
|
property real brightness: rootItem.brightness
|
|
property real contrast: rootItem.contrast
|
|
|
|
anchors.fill: parent
|
|
blending: !rootItem.cached
|
|
|
|
fragmentShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/brightnesscontrast.frag"
|
|
}
|
|
}
|