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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgimagenode.h"
QT_BEGIN_NAMESPACE
/*!
\class QSGImageNode
\brief The QSGImageNode class is provided for convenience to easily draw
textured content using the QML scene graph.
\inmodule QtQuick
\since 5.8
\warning The image node class must have a texture before being
added to the scene graph to be rendered.
*/
/*!
\fn void QSGImageNode::setRect(const QRectF &rect)
Sets the target rect of this image node to \a rect.
*/
/*!
\fn void QSGImageNode::setRect(qreal x, qreal y, qreal w, qreal h)
\overload
Sets the rectangle of this image node to begin at (\a x, \a y) and have
width \a w and height \a h.
*/
/*!
\fn QRectF QSGImageNode::rect() const
Returns the target rect of this image node.
*/
/*!
\fn void QSGImageNode::setSourceRect(const QRectF &rect)
Sets the source rect of this image node to \a rect.
*/
/*!
\fn void QSGImageNode::setSourceRect(qreal x, qreal y, qreal w, qreal h)
\overload
Sets the rectangle of this image node to show its texture from (\a x, \a y) and
have width \a w and height \a h relatively to the QSGTexture::textureSize.
*/
/*!
\fn QRectF QSGImageNode::sourceRect() const
Returns the source rect of this image node.
*/
/*!
\fn void QSGImageNode::setTexture(QSGTexture *texture)
Sets the texture of this image node to \a texture.
Use setOwnsTexture() to set whether the node should take
ownership of the texture. By default, the node does not
take ownership.
\warning An image node must have a texture before being added to the
scenegraph to be rendered.
*/
/*!
\fn QSGTexture *QSGImageNode::texture() const
Returns the texture for this image node.
*/
/*!
\fn void QSGImageNode::setFiltering(QSGTexture::Filtering filtering)
Sets the filtering to be used for this image node to \a filtering.
For smooth scaling, use QSGTexture::Linear. For normal scaling, use
QSGTexture::Nearest.
*/
/*!
\fn QSGTexture::Filtering QSGImageNode::filtering() const
Returns the filtering for this image node.
*/
/*!
\fn void QSGImageNode::setMipmapFiltering(QSGTexture::Filtering filtering)
Sets the mipmap filtering to be used for this image node to \a filtering.
For smooth scaling between mip maps, use QSGTexture::Linear.
For normal scaling, use QSGTexture::Nearest.
*/
/*!
\fn QSGTexture::Filtering QSGImageNode::mipmapFiltering() const
Returns the mipmap filtering for this image node.
*/
/*!
\enum QSGImageNode::TextureCoordinatesTransformFlag
The TextureCoordinatesTransformFlag enum is used to specify the mode used
to generate texture coordinates for a textured quad.
\value NoTransform Texture coordinates are oriented with window coordinates
i.e. with origin at top-left.
\value MirrorHorizontally Texture coordinates are inverted in the horizontal axis with
respect to window coordinates
\value MirrorVertically Texture coordinates are inverted in the vertical axis with
respect to window coordinates
*/
/*!
\fn void QSGImageNode::setTextureCoordinatesTransform(TextureCoordinatesTransformMode mode)
Sets the method used to generate texture coordinates to \a mode. This can
be used to obtain correct orientation of the texture. This is commonly
needed when using a third-party OpenGL library to render to texture as
OpenGL has an inverted y-axis relative to Qt Quick.
*/
/*!
\fn QSGImageNode::TextureCoordinatesTransformMode QSGImageNode::textureCoordinatesTransform() const
Returns the mode used to generate texture coordinates for this node.
*/
/*!
\fn void QSGImageNode::setOwnsTexture(bool owns)
Sets whether the node takes ownership of the texture to \a owns.
By default, the node does not take ownership of the texture.
*/
/*!
\fn bool QSGImageNode::ownsTexture() const
\return \c true if the node takes ownership of the texture; otherwise \c false.
*/
/*!
Updates the geometry \a g with the \a texture, the coordinates
in \a rect, and the texture coordinates from \a sourceRect.
\a g is assumed to be a triangle strip of four vertices of type
QSGGeometry::TexturedPoint2D.
\a texCoordMode is used for normalizing the \a sourceRect.
*/
void QSGImageNode::rebuildGeometry(QSGGeometry *g,
QSGTexture *texture,
const QRectF &rect,
QRectF sourceRect,
TextureCoordinatesTransformMode texCoordMode)
{
if (!texture)
return;
if (!sourceRect.width() || !sourceRect.height()) {
QSize ts = texture->textureSize();
sourceRect = QRectF(0, 0, ts.width(), ts.height());
}
// Maybe transform the texture coordinates
if (texCoordMode.testFlag(QSGImageNode::MirrorHorizontally)) {
float tmp = sourceRect.left();
sourceRect.setLeft(sourceRect.right());
sourceRect.setRight(tmp);
}
if (texCoordMode.testFlag(QSGImageNode::MirrorVertically)) {
float tmp = sourceRect.top();
sourceRect.setTop(sourceRect.bottom());
sourceRect.setBottom(tmp);
}
QSGGeometry::updateTexturedRectGeometry(g, rect, texture->convertToNormalizedSourceRect(sourceRect));
}
QT_END_NAMESPACE
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