Port 17 effects to RHI, remove 8 unportable ones

The following are based on static shader code, and after porting the
shaders they will work fully identically to 5.15:

FastBlur
Colorize
OpacityMask
BrightnessContrast
ColorOverlay
Desaturate
Displace
GammaAdjust
HueSaturation
LevelAdjust
RectangularGlow
Thresholdmask
LinearGradient
RadialGradient
ConicalGradient

The following change behavior:

Glow
DropShadow

These now only have the fast variants, because those rely on static shader code.
So we are going back to the Qt 5.5 versions and make them behave as if 'fast'
was always set to true. The 'fast' and 'samples' properties are removed.

The following are removed:

Blend
GaussianBlur
DirectionalBlur
MaskedBlur
RadialBlur
RecursiveBlur
ZoomBlur
InnerShadow

The autotest and the gallery application (run qmlscene testBed.qml in
tests/manual/testbed) have been adjusted accordingly and now work across
all QRhi backends.

The docs may still refer to removed effects in some code snippets. Updating
that is left as a separate exercise.

[ChangeLog] Graphical Effects no longer relies on dynamically generated
shader strings. The following effects have been removed: Blend, GaussianBlur,
MaskedBlur, RadialBlur, RecursiveBlur, ZoomBlur, InnerShadow. Glow
and DropShadow always use the 'fast' variant. The fast and samples
properties for these are thus no longer applicable and have been
removed.

Change-Id: Ife83f3828f37977596fd34f8da8b61961f0ed28a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 0 insertions, 218 deletions

diff --git a/src/effects/MaskedBlur.qml b/src/effects/MaskedBlur.qml
deleted file mode 100644
index d777b0a..0000000
--- a/src/effects/MaskedBlur.qml
+++ /dev/null
@@ -1,218 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2017 The Qt Company Ltd.
-** Copyright (C) 2017 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
-** 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 MaskedBlur
-    \inqmlmodule QtGraphicalEffects
-    \since QtGraphicalEffects 1.0
-    \inherits QtQuick2::Item
-    \ingroup qtgraphicaleffects-blur
-    \brief Applies a blur effect with a varying intesity.
-
-    MaskedBlur effect softens the image by blurring it. The intensity of the
-    blur can be controlled for each pixel using maskSource so that some parts of
-    the source are blurred more than others.
-
-    Performing blur live is a costly operation. Fullscreen gaussian blur
-    with even a moderate number of samples will only run at 60 fps on highend
-    graphics hardware.
-
-    \table
-    \header
-        \li Source
-        \li MaskSource
-        \li Effect applied
-    \row
-        \li \image Original_bug.png
-        \li \image MaskedBlur_mask.png
-        \li \image MaskedBlur_bug.png
-    \endtable
-
-    \note This effect is available when running with OpenGL.
-
-    \section1 Example
-
-    The following example shows how to apply the effect.
-    \snippet MaskedBlur-example.qml example
-
-*/
-Item {
-    id: root
-
-    /*!
-        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 alias source: blur.source
-
-    /*!
-        This property defines the item that is controlling the final intensity
-        of the blur. The pixel alpha channel value from maskSource defines the
-        actual blur radius that is going to be used for blurring the
-        corresponding source pixel.
-
-        Opaque maskSource pixels produce blur with specified
-        \l{MaskedBlur::radius}{radius}, while transparent pixels suppress the
-        blur completely. Semitransparent maskSource pixels produce blur with a
-        radius that is interpolated according to the pixel transparency level.
-    */
-    property alias maskSource: maskProxy.input
-
-    /*!
-        This property defines the distance of the neighboring pixels which
-        affect the blurring of an individual pixel. A larger radius increases
-        the blur effect.
-
-        Depending on the radius value, value of the
-        \l{MaskedBlur::samples}{samples} should be set to sufficiently large to
-        ensure the visual quality.
-
-        The value ranges from 0.0 (no blur) to inf. By default, the property is
-        set to \c 0.0 (no blur).
-
-        \table
-        \header
-        \li Output examples with different radius values
-        \li
-        \li
-        \row
-            \li \image MaskedBlur_radius1.png
-            \li \image MaskedBlur_radius2.png
-            \li \image MaskedBlur_radius3.png
-        \row
-            \li \b { radius: 0 }
-            \li \b { radius: 8 }
-            \li \b { radius: 16 }
-        \row
-            \li \l samples: 25
-            \li \l samples: 25
-            \li \l samples: 25
-        \endtable
-
-    */
-    property alias radius: blur.radius
-
-    /*!
-        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.
-
-        Ideally, this value should be twice as large as the highest required
-        radius value plus 1, for example, if the radius is animated between 0.0
-        and 4.0, samples should be set to 9.
-
-        By default, the property is set to \c 9.
-
-        This property is not intended to be animated. Changing this property may
-        cause the underlying OpenGL shaders to be recompiled.
-    */
-    property alias samples: blur.samples
-
-    /*!
-        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 alias cached: cacheItem.visible
-
-    /*!
-        \internal
-
-        Kept for source compatibility only. Removed in Qt 5.6
-        ### Qt6: remove
-    */
-    property bool fast: false
-
-    /*!
-        \internal
-
-        Kept for source compatibility only. Removed in Qt 5.6
-
-        Doing transparent border on a masked source doesn't make any sense
-        as the padded exterior will have a mask alpha value of 0 which means
-        no blurring and as the padded exterior of the source is a transparent
-        pixel, the result is no pixels at all.
-
-        In Qt 5.6 and before, this worked based on that the mask source
-        was scaled up to fit the padded blur target rect, which would lead
-        to inconsistent and buggy results.
-
-        ### Qt6: remove
-    */
-    property bool transparentBorder;
-
-    GaussianBlur {
-        id: blur
-
-        source: root.source;
-        anchors.fill: parent
-        _maskSource: maskProxy.output;
-
-        SourceProxy {
-            id: maskProxy
-        }
-    }
-
-    ShaderEffectSource {
-        id: cacheItem
-        x: -blur._kernelRadius
-        y: -blur._kernelRadius
-        width: blur.width + 2 * blur._kernelRadius
-        height: blur.height + 2 * blur._kernelRadius
-        visible: false
-        smooth: true
-        sourceRect: Qt.rect(-blur._kernelRadius, -blur._kernelRadius, width, height);
-        sourceItem: blur
-        hideSource: visible
-    }
-}