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| ** This file is part of the Qt Add-On Graphical Effects module. |
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| |
| import QtQuick 2.12 |
| import QtGraphicalEffects.private 1.12 |
| |
| /*! |
| \qmltype LevelAdjust |
| \inqmlmodule QtGraphicalEffects |
| \since QtGraphicalEffects 1.0 |
| \inherits QtQuick2::Item |
| \ingroup qtgraphicaleffects-color |
| \brief Adjusts color levels in the RGBA color space. |
| |
| This effect adjusts the source item colors separately for each color |
| channel. Source item contrast can be adjusted and color balance altered. |
| |
| \table |
| \header |
| \li Source |
| \li Effect applied |
| \row |
| \li \image Original_butterfly.png |
| \li \image LevelAdjust_butterfly.png |
| \endtable |
| |
| \note This effect is available when running with OpenGL. |
| |
| \section1 Example |
| |
| The following example shows how to apply the effect. |
| \snippet LevelAdjust-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 the change factor for how the value of each pixel |
| color channel is altered according to the equation: |
| |
| \code |
| result.rgb = pow(original.rgb, 1.0 / gamma.rgb); |
| \endcode |
| |
| Setting the gamma values under QtVector3d(1.0, 1.0, 1.0) makes the image |
| darker, the values above QtVector3d(1.0, 1.0, 1.0) lighten it. |
| |
| The value ranges from QtVector3d(0.0, 0.0, 0.0) (darkest) to inf |
| (lightest). By default, the property is set to \c QtVector3d(1.0, 1.0, |
| 1.0) (no change). |
| |
| \table |
| \header |
| \li Output examples with different gamma values |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_gamma1.png |
| \li \image LevelAdjust_gamma2.png |
| \li \image LevelAdjust_gamma3.png |
| \row |
| \li \b { gamma: Qt.vector3d(1.0, 1.0, 1.0) } |
| \li \b { gamma: Qt.vector3d(1.0, 0.4, 2.0) } |
| \li \b { gamma: Qt.vector3d(1.0, 0.1, 4.0) } |
| \row |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \row |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \row |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \row |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \endtable |
| |
| \table |
| \header |
| \li Pixel color channel luminance curves of the above images. |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_default_curve.png |
| \li \image LevelAdjust_gamma2_curve.png |
| \li \image LevelAdjust_gamma3_curve.png |
| \row |
| \li X-axis: pixel original luminance |
| \li |
| \li |
| \row |
| \li Y-axis: color channel luminance with effect applied |
| \li |
| \li |
| \endtable |
| */ |
| property variant gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| |
| /*! |
| This property defines the minimum input level for each color channel. It |
| sets the black-point, all pixels having lower value than this property |
| are rendered as black (per color channel). Increasing the value darkens |
| the dark areas. |
| |
| The value ranges from "#00000000" to "#ffffffff". By default, the |
| property is set to \c "#00000000" (no change). |
| |
| \table |
| \header |
| \li Output examples with different minimumInput values |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_minimumInput1.png |
| \li \image LevelAdjust_minimumInput2.png |
| \li \image LevelAdjust_minimumInput3.png |
| \row |
| \li \b { minimumInput: #00000000 } |
| \li \b { minimumInput: #00000040 } |
| \li \b { minimumInput: #00000070 } |
| \row |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \row |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \row |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \row |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \endtable |
| |
| \table |
| \header |
| \li Pixel color channel luminance curves of the above images. |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_default_curve.png |
| \li \image LevelAdjust_minimumInput2_curve.png |
| \li \image LevelAdjust_minimumInput3_curve.png |
| \row |
| \li X-axis: pixel original luminance |
| \li |
| \li |
| \row |
| \li Y-axis: color channel luminance with effect applied |
| \li |
| \li |
| \endtable |
| |
| */ |
| property color minimumInput: Qt.rgba(0.0, 0.0, 0.0, 0.0) |
| |
| /*! |
| This property defines the maximum input level for each color channel. |
| It sets the white-point, all pixels having higher value than this |
| property are rendered as white (per color channel). |
| Decreasing the value lightens the light areas. |
| |
| The value ranges from "#ffffffff" to "#00000000". By default, the |
| property is set to \c "#ffffffff" (no change). |
| |
| \table |
| \header |
| \li Output examples with different maximumInput values |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_maximumInput1.png |
| \li \image LevelAdjust_maximumInput2.png |
| \li \image LevelAdjust_maximumInput3.png |
| \row |
| \li \b { maximumInput: #FFFFFFFF } |
| \li \b { maximumInput: #FFFFFF80 } |
| \li \b { maximumInput: #FFFFFF30 } |
| \row |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \row |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \row |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \row |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \endtable |
| |
| \table |
| \header |
| \li Pixel color channel luminance curves of the above images. |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_default_curve.png |
| \li \image LevelAdjust_maximumInput2_curve.png |
| \li \image LevelAdjust_maximumInput3_curve.png |
| \row |
| \li X-axis: pixel original luminance |
| \li |
| \li |
| \row |
| \li Y-axis: color channel luminance with effect applied |
| \li |
| \li |
| \endtable |
| |
| */ |
| property color maximumInput: Qt.rgba(1.0, 1.0, 1.0, 1.0) |
| |
| /*! |
| This property defines the minimum output level for each color channel. |
| Increasing the value lightens the dark areas, reducing the contrast. |
| |
| The value ranges from "#00000000" to "#ffffffff". By default, the |
| property is set to \c "#00000000" (no change). |
| |
| \table |
| \header |
| \li Output examples with different minimumOutput values |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_minimumOutput1.png |
| \li \image LevelAdjust_minimumOutput2.png |
| \li \image LevelAdjust_minimumOutput3.png |
| \row |
| \li \b { minimumOutput: #00000000 } |
| \li \b { minimumOutput: #00000070 } |
| \li \b { minimumOutput: #000000A0 } |
| \row |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \row |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \row |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \li \l maximumOutput: #ffffff |
| \row |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \endtable |
| |
| \table |
| \header |
| \li Pixel color channel luminance curves of the above images. |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_default_curve.png |
| \li \image LevelAdjust_minimumOutput2_curve.png |
| \li \image LevelAdjust_minimumOutput3_curve.png |
| \row |
| \li X-axis: pixel original luminance |
| \li |
| \li |
| \row |
| \li Y-axis: color channel luminance with effect applied |
| \li |
| \li |
| \endtable |
| |
| */ |
| property color minimumOutput: Qt.rgba(0.0, 0.0, 0.0, 0.0) |
| |
| /*! |
| This property defines the maximum output level for each color channel. |
| Decreasing the value darkens the light areas, reducing the contrast. |
| |
| The value ranges from "#ffffffff" to "#00000000". By default, the |
| property is set to \c "#ffffffff" (no change). |
| |
| \table |
| \header |
| \li Output examples with different maximumOutput values |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_maximumOutput1.png |
| \li \image LevelAdjust_maximumOutput2.png |
| \li \image LevelAdjust_maximumOutput3.png |
| \row |
| \li \b { maximumOutput: #FFFFFFFF } |
| \li \b { maximumOutput: #FFFFFF80 } |
| \li \b { maximumOutput: #FFFFFF30 } |
| \row |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \li \l minimumInput: #000000 |
| \row |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \li \l maximumInput: #ffffff |
| \row |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \li \l minimumOutput: #000000 |
| \row |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \li \l gamma: Qt.vector3d(1.0, 1.0, 1.0) |
| \endtable |
| |
| \table |
| \header |
| \li Pixel color channel luminance curves of the above images. |
| \li |
| \li |
| \row |
| \li \image LevelAdjust_default_curve.png |
| \li \image LevelAdjust_maximumOutput2_curve.png |
| \li \image LevelAdjust_maximumOutput3_curve.png |
| \row |
| \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: input && input.smooth ? SourceProxy.LinearInterpolation : SourceProxy.NearestInterpolation |
| } |
| |
| 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" |
| } |
| } |