Color spaces, beginning of painting

PdfForQtLib/sources/pdfcolorspaces.h

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+//    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/>.
+
+#ifndef PDFCOLORSPACES_H
+#define PDFCOLORSPACES_H
+
+#include "pdfflatarray.h"
+
+#include <QColor>
+
+namespace pdf
+{
+
+using PDFColorComponent = float;
+using PDFColor = PDFFlatArray<PDFColorComponent, 4>;
+
+/// Represents PDF's color space
+class PDFAbstractColorSpace
+{
+public:
+    explicit PDFAbstractColorSpace() = default;
+    virtual ~PDFAbstractColorSpace() = default;
+
+    virtual QColor getColor(const PDFColor& color) const = 0;
+    virtual size_t getColorComponentCount() const = 0;
+
+protected:
+    /// Clips the color component to range [0, 1]
+    static constexpr PDFColorComponent clip01(PDFColorComponent component) { return qBound<PDFColorComponent>(0.0, component, 1.0); }
+};
+
+class PDFDeviceGrayColorSpace : public PDFAbstractColorSpace
+{
+public:
+    explicit PDFDeviceGrayColorSpace() = default;
+    virtual ~PDFDeviceGrayColorSpace() = default;
+
+    virtual QColor getColor(const PDFColor& color) const override;
+    virtual size_t getColorComponentCount() const override;
+};
+
+class PDFDeviceRGBColorSpace : public PDFAbstractColorSpace
+{
+public:
+    explicit PDFDeviceRGBColorSpace() = default;
+    virtual ~PDFDeviceRGBColorSpace() = default;
+
+    virtual QColor getColor(const PDFColor& color) const override;
+    virtual size_t getColorComponentCount() const override;
+};
+
+class PDFDeviceCMYKColorSpace : public PDFAbstractColorSpace
+{
+public:
+    explicit PDFDeviceCMYKColorSpace() = default;
+    virtual ~PDFDeviceCMYKColorSpace() = default;
+
+    virtual QColor getColor(const PDFColor& color) const override;
+    virtual size_t getColorComponentCount() const override;
+};
+
+}   // namespace pdf
+
+#endif // PDFCOLORSPACES_H