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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "commonutils_p.h"
#include "qquickgraphstexturedata_p.h"
#include <QtGraphs/private/qgraphsglobal_p.h>
#include <qtgraphs_tracepoints_p.h>
QT_BEGIN_NAMESPACE
Q_TRACE_PREFIX(qtgraphs,
"QT_BEGIN_NAMESPACE" \
"class QQuickGraphsTextureData;" \
"QT_END_NAMESPACE"
)
Q_TRACE_POINT(qtgraphs, QGraphs3DCreateGradient_entry, QSize textureSize);
Q_TRACE_POINT(qtgraphs, QGraphs3DCreateGradient_exit);
QQuickGraphsTextureData::QQuickGraphsTextureData() {}
QQuickGraphsTextureData::~QQuickGraphsTextureData() {}
void QQuickGraphsTextureData::createGradient(QLinearGradient gradient)
{
const qreal textureWidth = CommonUtils::maxTextureSize();
Q_TRACE_SCOPE(QGraphs3DCreateGradient, QSize(textureWidth, gradientTextureHeight));
setSize(QSize(textureWidth, gradientTextureHeight));
setFormat(QQuick3DTextureData::RGBA8);
setHasTransparency(false);
// Make sure the gradient fills the whole image
gradient.setFinalStop(textureWidth, gradientTextureHeight);
gradient.setStart(0., 0.);
QByteArray imageData;
QByteArray gradientScanline;
gradientScanline.resize(textureWidth * 4); // RGBA8
auto stops = gradient.stops();
int x = 0;
for (int i = 1; i < stops.size(); i++) {
QColor startColor = stops.at(i - 1).second;
QColor endColor = stops.at(i).second;
float w = 0.0f;
w = (stops.at(i).first - stops.at(i - 1).first) * textureWidth;
if (startColor.alphaF() < 1.0 || endColor.alphaF() < 1.0)
setHasTransparency(true);
for (int t = 0; t <= static_cast<int>(w); t++) {
QColor color = linearInterpolate(startColor, endColor, t / w);
int offset = x * 4;
gradientScanline.data()[offset + 0] = char(color.red());
gradientScanline.data()[offset + 1] = char(color.green());
gradientScanline.data()[offset + 2] = char(color.blue());
gradientScanline.data()[offset + 3] = char(color.alpha());
x++;
}
}
for (int y = 0; y < gradientTextureHeight; y++)
imageData += gradientScanline;
setTextureData(imageData);
}
QColor QQuickGraphsTextureData::linearInterpolate(QColor startColor, QColor endColor, float value)
{
QColor output;
output.setRedF(startColor.redF() + (value * (endColor.redF() - startColor.redF())));
output.setGreenF(startColor.greenF() + (value * (endColor.greenF() - startColor.greenF())));
output.setBlueF(startColor.blueF() + (value * (endColor.blueF() - startColor.blueF())));
output.setAlphaF(startColor.alphaF() + (value * (endColor.alphaF() - startColor.alphaF())));
return output;
}
QT_END_NAMESPACE
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