442 lines
15 KiB
QML
442 lines
15 KiB
QML
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/*****************************************************************************
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**
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** Copyright (C) 2017 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Add-On Graphical Effects module.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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*****************************************************************************/
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import QtQuick 2.12
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import QtGraphicalEffects.private 1.12
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/*!
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\qmltype LevelAdjust
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\inqmlmodule QtGraphicalEffects
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\since QtGraphicalEffects 1.0
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\inherits QtQuick2::Item
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\ingroup qtgraphicaleffects-color
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\brief Adjusts color levels in the RGBA color space.
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This effect adjusts the source item colors separately for each color
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channel. Source item contrast can be adjusted and color balance altered.
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\table
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\header
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\li Source
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\li Effect applied
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\row
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\li \image Original_butterfly.png
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\li \image LevelAdjust_butterfly.png
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\endtable
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\note This effect is available when running with OpenGL.
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\section1 Example
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The following example shows how to apply the effect.
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\snippet LevelAdjust-example.qml example
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*/
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Item {
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id: rootItem
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/*!
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This property defines the source item that provides the source pixels
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for the effect.
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\note It is not supported to let the effect include itself, for
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instance by setting source to the effect's parent.
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*/
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property variant source
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/*!
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This property defines the change factor for how the value of each pixel
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color channel is altered according to the equation:
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\code
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result.rgb = pow(original.rgb, 1.0 / gamma.rgb);
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\endcode
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Setting the gamma values under QtVector3d(1.0, 1.0, 1.0) makes the image
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darker, the values above QtVector3d(1.0, 1.0, 1.0) lighten it.
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The value ranges from QtVector3d(0.0, 0.0, 0.0) (darkest) to inf
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(lightest). By default, the property is set to \c QtVector3d(1.0, 1.0,
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1.0) (no change).
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\table
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\header
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\li Output examples with different gamma values
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\li
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\li
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\row
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\li \image LevelAdjust_gamma1.png
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\li \image LevelAdjust_gamma2.png
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\li \image LevelAdjust_gamma3.png
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\row
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\li \b { gamma: Qt.vector3d(1.0, 1.0, 1.0) }
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\li \b { gamma: Qt.vector3d(1.0, 0.4, 2.0) }
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\li \b { gamma: Qt.vector3d(1.0, 0.1, 4.0) }
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\row
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\row
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\row
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\row
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\endtable
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\table
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\header
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\li Pixel color channel luminance curves of the above images.
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\li
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\li
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\row
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\li \image LevelAdjust_default_curve.png
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\li \image LevelAdjust_gamma2_curve.png
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\li \image LevelAdjust_gamma3_curve.png
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\row
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\li X-axis: pixel original luminance
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\li
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\li
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\row
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\li Y-axis: color channel luminance with effect applied
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\li
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\li
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\endtable
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*/
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property variant gamma: Qt.vector3d(1.0, 1.0, 1.0)
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/*!
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This property defines the minimum input level for each color channel. It
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sets the black-point, all pixels having lower value than this property
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are rendered as black (per color channel). Increasing the value darkens
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the dark areas.
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The value ranges from "#00000000" to "#ffffffff". By default, the
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property is set to \c "#00000000" (no change).
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\table
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\header
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\li Output examples with different minimumInput values
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\li
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\li
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\row
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\li \image LevelAdjust_minimumInput1.png
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\li \image LevelAdjust_minimumInput2.png
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\li \image LevelAdjust_minimumInput3.png
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\row
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\li \b { minimumInput: #00000000 }
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\li \b { minimumInput: #00000040 }
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\li \b { minimumInput: #00000070 }
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\row
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\row
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\row
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\row
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\endtable
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\table
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\header
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\li Pixel color channel luminance curves of the above images.
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\li
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\li
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\row
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\li \image LevelAdjust_default_curve.png
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\li \image LevelAdjust_minimumInput2_curve.png
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\li \image LevelAdjust_minimumInput3_curve.png
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\row
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\li X-axis: pixel original luminance
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\li
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\li
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\row
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\li Y-axis: color channel luminance with effect applied
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\li
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\li
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\endtable
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*/
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property color minimumInput: Qt.rgba(0.0, 0.0, 0.0, 0.0)
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/*!
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This property defines the maximum input level for each color channel.
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It sets the white-point, all pixels having higher value than this
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property are rendered as white (per color channel).
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Decreasing the value lightens the light areas.
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The value ranges from "#ffffffff" to "#00000000". By default, the
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property is set to \c "#ffffffff" (no change).
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\table
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\header
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\li Output examples with different maximumInput values
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\li
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\li
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\row
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\li \image LevelAdjust_maximumInput1.png
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\li \image LevelAdjust_maximumInput2.png
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\li \image LevelAdjust_maximumInput3.png
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\row
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\li \b { maximumInput: #FFFFFFFF }
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\li \b { maximumInput: #FFFFFF80 }
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\li \b { maximumInput: #FFFFFF30 }
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\row
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\row
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\row
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\row
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\endtable
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\table
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\header
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\li Pixel color channel luminance curves of the above images.
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\li
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\li
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\row
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\li \image LevelAdjust_default_curve.png
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\li \image LevelAdjust_maximumInput2_curve.png
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\li \image LevelAdjust_maximumInput3_curve.png
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\row
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\li X-axis: pixel original luminance
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\li
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\li
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\row
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\li Y-axis: color channel luminance with effect applied
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\li
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\li
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\endtable
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*/
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property color maximumInput: Qt.rgba(1.0, 1.0, 1.0, 1.0)
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/*!
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This property defines the minimum output level for each color channel.
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Increasing the value lightens the dark areas, reducing the contrast.
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The value ranges from "#00000000" to "#ffffffff". By default, the
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property is set to \c "#00000000" (no change).
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\table
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\header
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\li Output examples with different minimumOutput values
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\li
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\li
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\row
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\li \image LevelAdjust_minimumOutput1.png
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\li \image LevelAdjust_minimumOutput2.png
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\li \image LevelAdjust_minimumOutput3.png
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\row
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\li \b { minimumOutput: #00000000 }
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\li \b { minimumOutput: #00000070 }
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\li \b { minimumOutput: #000000A0 }
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\row
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\row
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\row
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\li \l maximumOutput: #ffffff
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\row
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\endtable
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\table
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\header
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\li Pixel color channel luminance curves of the above images.
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\li
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\li
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\row
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\li \image LevelAdjust_default_curve.png
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\li \image LevelAdjust_minimumOutput2_curve.png
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\li \image LevelAdjust_minimumOutput3_curve.png
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\row
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\li X-axis: pixel original luminance
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\li
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\li
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\row
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\li Y-axis: color channel luminance with effect applied
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\li
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\li
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\endtable
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*/
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property color minimumOutput: Qt.rgba(0.0, 0.0, 0.0, 0.0)
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/*!
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This property defines the maximum output level for each color channel.
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Decreasing the value darkens the light areas, reducing the contrast.
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The value ranges from "#ffffffff" to "#00000000". By default, the
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property is set to \c "#ffffffff" (no change).
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\table
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\header
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\li Output examples with different maximumOutput values
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\li
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\li
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\row
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\li \image LevelAdjust_maximumOutput1.png
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\li \image LevelAdjust_maximumOutput2.png
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\li \image LevelAdjust_maximumOutput3.png
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\row
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\li \b { maximumOutput: #FFFFFFFF }
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\li \b { maximumOutput: #FFFFFF80 }
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\li \b { maximumOutput: #FFFFFF30 }
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\row
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\li \l minimumInput: #000000
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\row
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\li \l maximumInput: #ffffff
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\row
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\li \l minimumOutput: #000000
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\row
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\li \l gamma: Qt.vector3d(1.0, 1.0, 1.0)
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\endtable
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\table
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\header
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\li Pixel color channel luminance curves of the above images.
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\li
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\li
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\row
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\li \image LevelAdjust_default_curve.png
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\li \image LevelAdjust_maximumOutput2_curve.png
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\li \image LevelAdjust_maximumOutput3_curve.png
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\row
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\li X-axis: pixel original luminance
|
||
|
|
\li
|
||
|
|
\li
|
||
|
|
\row
|
||
|
|
\li Y-axis: color channel luminance with effect applied
|
||
|
|
\li
|
||
|
|
\li
|
||
|
|
\endtable
|
||
|
|
*/
|
||
|
|
property color maximumOutput: Qt.rgba(1.0, 1.0, 1.0, 1.0)
|
||
|
|
|
||
|
|
/*!
|
||
|
|
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 variant minimumInputRGB: Qt.vector3d(rootItem.minimumInput.r, rootItem.minimumInput.g, rootItem.minimumInput.b)
|
||
|
|
property variant maximumInputRGB: Qt.vector3d(rootItem.maximumInput.r, rootItem.maximumInput.g, rootItem.maximumInput.b)
|
||
|
|
property real minimumInputAlpha: rootItem.minimumInput.a
|
||
|
|
property real maximumInputAlpha: rootItem.maximumInput.a
|
||
|
|
property variant minimumOutputRGB: Qt.vector3d(rootItem.minimumOutput.r, rootItem.minimumOutput.g, rootItem.minimumOutput.b)
|
||
|
|
property variant maximumOutputRGB: Qt.vector3d(rootItem.maximumOutput.r, rootItem.maximumOutput.g, rootItem.maximumOutput.b)
|
||
|
|
property real minimumOutputAlpha: rootItem.minimumOutput.a
|
||
|
|
property real maximumOutputAlpha: rootItem.maximumOutput.a
|
||
|
|
property variant gamma: Qt.vector3d(1.0 / Math.max(rootItem.gamma.x, 0.0001), 1.0 / Math.max(rootItem.gamma.y, 0.0001), 1.0 / Math.max(rootItem.gamma.z, 0.0001))
|
||
|
|
anchors.fill: parent
|
||
|
|
|
||
|
|
fragmentShader: "qrc:/qt-project.org/imports/QtGraphicalEffects/shaders/leveladjust.frag"
|
||
|
|
}
|
||
|
|
}
|