1 /** -*- mode: c++ ; c-basic-offset: 2 -*-
2 *
3 * @file ImageTools.cpp
4 *
5 * Copyright 2017 Sebastien Fourey
6 *
7 * This file is part of G'MIC-Qt, a generic plug-in for raster graphics
8 * editors, offering hundreds of filters thanks to the underlying G'MIC
9 * image processing framework.
10 *
11 * gmic_qt is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * gmic_qt is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with gmic_qt. If not, see <http://www.gnu.org/licenses/>.
23 *
24 */
25 #include "ImageTools.h"
26 #include <QDebug>
27 #include <QImage>
28 #include <QPainter>
29 #include "GmicStdlib.h"
30 #include "gmic.h"
31
32 /*
33 * Part of this code is much inspired by the original source code
34 * of the GTK version of the gmic plug-in for GIMP by David Tschumperl\'e.
35 */
36
37 namespace GmicQt
38 {
39
buildPreviewImage(const cimg_library::CImgList<float> & images,cimg_library::CImg<float> & result)40 void buildPreviewImage(const cimg_library::CImgList<float> & images, cimg_library::CImg<float> & result)
41 {
42 cimg_library::CImgList<gmic_pixel_type> preview_input_images;
43 if (images.size() > 0) {
44 preview_input_images.push_back(images[0]);
45 int spectrum = 0;
46 cimglist_for(preview_input_images, l) { spectrum = std::max(spectrum, preview_input_images[l].spectrum()); }
47 spectrum += (spectrum == 1 || spectrum == 3);
48 cimglist_for(preview_input_images, l) { calibrateImage(preview_input_images[l], spectrum, true); }
49 result.swap(preview_input_images.front());
50 } else {
51 result.assign();
52 }
53 }
54
checkImageSpectrumAtMost4(const cimg_library::CImgList<float> & images,unsigned int & index)55 bool checkImageSpectrumAtMost4(const cimg_library::CImgList<float> & images, unsigned int & index)
56 {
57 for (unsigned int i = 0; i < images.size(); ++i) {
58 if (images[i].spectrum() > 4) {
59 index = i;
60 return false;
61 }
62 }
63 return true;
64 }
65
hasAlphaChannel(const cimg_library::CImg<T> & image)66 template <typename T> bool hasAlphaChannel(const cimg_library::CImg<T> & image)
67 {
68 return image.spectrum() == 2 || image.spectrum() == 4;
69 }
70
71 template bool hasAlphaChannel(const cimg_library::CImg<float> &);
72 template bool hasAlphaChannel(const cimg_library::CImg<unsigned char> &);
73
74 } // namespace GmicQt
75