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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "topographicseries.h"
++
++ //! [0]
++ // Value used to encode height data as RGB value on PNG file
++ const float packingFactor = 11983.f;
++ //! [0]
++
++ TopographicSeries::TopographicSeries()
++ {
++ setDrawMode(QSurface3DSeries::DrawSurface);
++ setShading(QSurface3DSeries::Shading::Flat);
++ setBaseColor(Qt::white);
++ }
++
++ TopographicSeries::~TopographicSeries() = default;
++
++ void TopographicSeries::setTopographyFile(const QString &file, float width, float height)
++ {
++ //! [1]
++ QImage heightMapImage(file);
++ uchar *bits = heightMapImage.bits();
++ int imageHeight = heightMapImage.height();
++ int imageWidth = heightMapImage.width();
++ int widthBits = imageWidth * 4;
++ float stepX = width / float(imageWidth);
++ float stepZ = height / float(imageHeight);
++
++ QSurfaceDataArray dataArray;
++ dataArray.reserve(imageHeight);
++ for (int i = 0; i < imageHeight; ++i) {
++ int p = i * widthBits;
++ float z = height - float(i) * stepZ;
++ QSurfaceDataRow newRow;
++ newRow.reserve(imageWidth);
++ for (int j = 0; j < imageWidth; ++j) {
++ uchar aa = bits[p + 0];
++ uchar rr = bits[p + 1];
++ uchar gg = bits[p + 2];
++ uint color = uint((gg << 16) + (rr << 8) + aa);
++ float y = float(color) / packingFactor;
++ newRow.append(QSurfaceDataItem(float(j) * stepX, y, z));
++ p += 4;
++ }
++ dataArray.append(newRow);
++ }
++
++ dataProxy()->resetArray(dataArray);
++ //! [1]
++
++ m_sampleCountX = float(imageWidth);
++ m_sampleCountZ = float(imageHeight);
++ }