rgb.cpp

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// SPDX-License-Identifier: GPL-2.0-or-later
 * Authors: see git history
 *
 * Copyright (C) 2023 Authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#include "rgb.h"
 
#include <sstream>
 
#include "colors/cms/profile.h"
#include "colors/color.h"
#include "colors/utils.h"
 
namespace Inkscape::Colors::Space {
 
std::shared_ptr<Inkscape::Colors::CMS::Profile> const RGB::getProfile() const
{
    static std::shared_ptr<Colors::CMS::Profile> srgb_profile;
    if (!srgb_profile) {
        srgb_profile = Colors::CMS::Profile::create_srgb();
    }
    return srgb_profile;
}
 
RGB::RGB(Type type, int components, std::string name, std::string shortName, std::string icon, bool spaceIsUnbounded):
    AnySpace(type, components, std::move(name), std::move(shortName), std::move(icon), spaceIsUnbounded) {
}
 
std::string RGB::toString(std::vector<double> const &values, bool opacity) const
{
    return rgba_to_hex(toRGBA(values), values.size() == 4 && opacity);
}
 
uint32_t RGB::toRGBA(std::vector<double> const &values, double opacity) const
{
    if (getType() != Type::RGB) {
        std::vector<double> copy = values;
        spaceToProfile(copy);
        return _to_rgba(copy, opacity);
    }
    return _to_rgba(values, opacity);
}
 
uint32_t RGB::_to_rgba(std::vector<double> const &values, double opacity) const
{
    switch (values.size()) {
        case 3:
            return SP_RGBA32_F_COMPOSE(values[0], values[1], values[2], opacity);
        case 4:
            return SP_RGBA32_F_COMPOSE(values[0], values[1], values[2], opacity * values[3]);
        default:
            throw ColorError("Color values should be size 3 for RGB or 4 for RGBA.");
    }
    return 0x0; // transparent black
}
 
bool RGB::Parser::parse(std::istringstream &ss, std::vector<double> &output) const
{
    bool end = false;
    return append_css_value(ss, output, end, ',', 255)                    // Red
           && append_css_value(ss, output, end, ',', 255)                 // Green
           && append_css_value(ss, output, end, !_alpha ? '/' : ',', 255) // Blue
           && (append_css_value(ss, output, end) || !_alpha)              // Opacity
           && end;
}
 
} // namespace Inkscape::Colors::Space