1 | // Copyright (C) 2023 The Qt Company Ltd. |
---|---|
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
3 | |
4 | #include "qquickgraphstexturedata_p.h" |
5 | #include "utils_p.h" |
6 | |
7 | #include <QtGraphs/private/qgraphsglobal_p.h> |
8 | |
9 | QQuickGraphsTextureData::QQuickGraphsTextureData() {} |
10 | |
11 | QQuickGraphsTextureData::~QQuickGraphsTextureData() {} |
12 | |
13 | void QQuickGraphsTextureData::createGradient(QLinearGradient gradient) |
14 | { |
15 | const qreal textureWidth = Utils::maxTextureSize(); |
16 | setSize(QSize(textureWidth, gradientTextureHeight)); |
17 | setFormat(QQuick3DTextureData::RGBA8); |
18 | setHasTransparency(false); |
19 | |
20 | // Make sure the gradient fills the whole image |
21 | gradient.setFinalStop(x: textureWidth, y: gradientTextureHeight); |
22 | gradient.setStart(x: 0., y: 0.); |
23 | |
24 | QByteArray imageData; |
25 | |
26 | QByteArray gradientScanline; |
27 | gradientScanline.resize(size: textureWidth * 4); // RGBA8 |
28 | auto stops = gradient.stops(); |
29 | |
30 | int x = 0; |
31 | for (int i = 1; i < stops.size(); i++) { |
32 | QColor startColor = stops.at(i: i - 1).second; |
33 | QColor endColor = stops.at(i).second; |
34 | int w = 0; |
35 | w = (stops.at(i).first - stops.at(i: i - 1).first) * textureWidth; |
36 | |
37 | if (startColor.alphaF() < 1.0 || endColor.alphaF() < 1.0) |
38 | setHasTransparency(true); |
39 | |
40 | for (int t = 0; t <= w; t++) { |
41 | QColor color = linearInterpolate(startColor, endColor, value: t / float(w)); |
42 | int offset = x * 4; |
43 | gradientScanline.data()[offset + 0] = char(color.red()); |
44 | gradientScanline.data()[offset + 1] = char(color.green()); |
45 | gradientScanline.data()[offset + 2] = char(color.blue()); |
46 | gradientScanline.data()[offset + 3] = char(color.alpha()); |
47 | x++; |
48 | } |
49 | } |
50 | for (int y = 0; y < gradientTextureHeight; y++) |
51 | imageData += gradientScanline; |
52 | setTextureData(imageData); |
53 | } |
54 | |
55 | QColor QQuickGraphsTextureData::linearInterpolate(QColor startColor, QColor endColor, float value) |
56 | { |
57 | QColor output; |
58 | |
59 | output.setRedF(startColor.redF() + (value * (endColor.redF() - startColor.redF()))); |
60 | output.setGreenF(startColor.greenF() + (value * (endColor.greenF() - startColor.greenF()))); |
61 | output.setBlueF(startColor.blueF() + (value * (endColor.blueF() - startColor.blueF()))); |
62 | output.setAlphaF(startColor.alphaF() + (value * (endColor.alphaF() - startColor.alphaF()))); |
63 | |
64 | return output; |
65 | } |
66 |