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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qquickitemspy_p.h"
#include <QtQuick/private/qquickitem_p.h>
#include <QtGui/rhi/qrhi.h>
QT_BEGIN_NAMESPACE
/*!
\qmltype ItemSpy
\inqmlmodule QtQuick.VectorImage.Helpers
\brief Provides a way to track the world size of an item and bind to it.
\since 6.11
This type is used by VectorImage. It enables adjusting a post-processing effect's texture
size to automatically match the on-screen size of an item subtree.
*/
QQuickItemSpy::QQuickItemSpy(QQuickItem *parent)
: QQuickItem(parent)
{
setFlag(ItemObservesViewport);
}
QQuickItemSpy::~QQuickItemSpy()
{
}
/*!
\qmlproperty size QtQuick.VectorImage.Helpers::ItemType::requiredTextureSize
The texture size needed to render this item's width and height without scaling artifacts.
This accounts for the current transform as well as high-dpi scaling.
\note The returned size will never exceed the maximum supported texture size, and it will
never be smaller than \c{1x1}.
*/
QSizeF QQuickItemSpy::requiredTextureSize() const
{
QSizeF sz = mapRectToScene(QRectF(0, 0, width(), height())).size();
const qreal dpr = window() != nullptr ? window()->devicePixelRatio() : 1.0;
sz.setWidth(std::max(1.0, sz.width() * dpr));
sz.setHeight(std::max(1.0, sz.height() * dpr));
if (window() != nullptr && window()->rhi() != nullptr) {
QRhi *rhi = window()->rhi();
const int textureSizeMax = rhi->resourceLimit(QRhi::TextureSizeMax);
if (sz.width() > textureSizeMax || sz.height() > textureSizeMax) {
if (sz.width() > sz.height())
sz = QSizeF(textureSizeMax, sz.height() * (textureSizeMax / sz.width()));
else
sz = QSizeF(sz.width() * (textureSizeMax / sz.height()), textureSizeMax);
}
}
return sz;
}
void QQuickItemSpy::itemChange(ItemChange change, const ItemChangeData &value)
{
if (change == ItemTransformHasChanged || change == ItemDevicePixelRatioHasChanged)
emit requiredTextureSizeChanged();
QQuickItem::itemChange(change, value);
}
QT_END_NAMESPACE
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