draw_horizontal_line.hpp

#ifndef PASTELGFX_DRAW_HORIZONTAL_LINE_HPP
#define PASTELGFX_DRAW_HORIZONTAL_LINE_HPP

#include "pastel/gfx/drawing/draw_horizontal_line.h"
#include "pastel/gfx/color/colormixer/assign_colormixer.h"

#include "pastel/sys/syscommon.h"

namespace Pastel
{

    template <typename Type, typename Image_View, typename ColorMixer>
    void drawHorizontalLine(
        dreal x, integer y, dreal x2,
        const NoDeduction<Type>& color,
        const View<2, Type, Image_View>& image,
        const ColorMixer& colorMixer)
    {
        // Cull by y.

        if (y < 0 || y >= image.height())
        {
            return;
        }

        // Convert to integer coordinates.

        integer xMin = toPixelSpanPoint(x);
        integer xMax = toPixelSpanPoint(x2);

        // Cull by x.

        if (xMin >= image.width() || xMax <= 0)
        {
            return;
        }

        // Clip.

        if (xMin < 0)
        {
            xMin = 0;
        }

        if (xMax > image.width())
        {
            xMax = image.width();
        }

        using Cursor = typename Image_View::Cursor;

        Cursor cursor = image.cursor(xMin, y);

        // Draw.

        for (integer x = xMin;x < xMax;++x)
        {
            *cursor = colorMixer(*cursor, color);
            cursor.xIncrement();
        }
    }

    template <typename Type, typename Image_View>
    void drawHorizontalLine(
        dreal x, integer y, dreal x2,
        const NoDeduction<Type>& color,
        const View<2, Type, Image_View>& image)
    {
        drawHorizontalLine(
            x, y, x2, color, image, assignColorMixer<Type>());
    }

}

#endif