Color spaces, beginning of painting

PdfForQtLib/sources/pdfcolorspaces.cpp

@@ -0,0 +1,76 @@
+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfcolorspaces.h"
+
+namespace pdf
+{
+
+QColor PDFDeviceGrayColorSpace::getColor(const PDFColor& color) const
+{
+    Q_ASSERT(color.size() == getColorComponentCount());
+
+    PDFColorComponent component = clip01(color[0]);
+
+    QColor result(QColor::Rgb);
+    result.setRgbF(component, component, component, 1.0);
+    return result;
+}
+
+size_t PDFDeviceGrayColorSpace::getColorComponentCount() const
+{
+    return 1;
+}
+
+QColor PDFDeviceRGBColorSpace::getColor(const PDFColor& color) const
+{
+    Q_ASSERT(color.size() == getColorComponentCount());
+
+    PDFColorComponent r = clip01(color[0]);
+    PDFColorComponent g = clip01(color[1]);
+    PDFColorComponent b = clip01(color[2]);
+
+    QColor result(QColor::Rgb);
+    result.setRgbF(r, g, b, 1.0);
+    return result;
+}
+
+size_t PDFDeviceRGBColorSpace::getColorComponentCount() const
+{
+    return 3;
+}
+
+QColor PDFDeviceCMYKColorSpace::getColor(const PDFColor& color) const
+{
+    Q_ASSERT(color.size() == getColorComponentCount());
+
+    PDFColorComponent c = clip01(color[0]);
+    PDFColorComponent m = clip01(color[1]);
+    PDFColorComponent y = clip01(color[2]);
+    PDFColorComponent k = clip01(color[3]);
+
+    QColor result(QColor::Cmyk);
+    result.setCmykF(c, m, y, k, 1.0);
+    return result;
+}
+
+size_t PDFDeviceCMYKColorSpace::getColorComponentCount() const
+{
+    return 4;
+}
+
+}   // namespace pdf