luxos/SysCore/video/color/color.c

#include <color.h>
#include <stdlib.h>

RGBColor RGBColors_4bpp[] = {{0, 0, 0},      // 00 Black
                            {0, 0, 127},    // 01 Dark Blue
                            {0, 127, 0},    // 02 Dark Green
                            {0, 127, 127},  // 03 Dark Cyan
                            {127, 0, 0},    // 04 Dark Red
                            {127, 0, 127},  // 05 Dark Magenta
                            {127, 127, 0},  // 06 Dark Yellow
                            {192, 192, 192},// 07 Light Gray
                            {127, 127, 127},// 08 Dark Gray
                            {0, 0, 255},    // 09 Blue
                            {0, 255, 0},    // 10 Green
                            {0, 255, 255},  // 11 Cyan
                            {255, 0, 0},    // 12 Red
                            {255, 0, 255},  // 13 Magenta
                            {255, 255, 0},  // 14 Yellow
                            {255, 255, 255} // 15 White
};


RGBColor Convert_1bpp_to_RGB(Color_1Bpp c)
{
    unsigned char t = (c) ? 0xFF : 0x00;
    RGBColor temp = {t, t, t};
    return temp;
}

RGBColor Convert_4bpp_to_RGB(Color_4Bpp c)
{
    return RGBColors_4bpp[c];
}

RGBColor Convert_6bpp_to_RGB(Color_6Bpp c)
{
    unsigned char R, G, B;
    R = (unsigned char) ((unsigned)((c & 0x30)>>4) * 255 / 3 );
    G = (unsigned char) ((unsigned)((c & 0x0C)>>2) * 255 / 3 );
    B = (unsigned char) ((unsigned) (c & 0x03) * 255 / 3 );
    RGBColor ret = {R, G, B};
    return ret;
}

RGBColor Convert_8bpp_to_RGB(Color_8Bpp c)
{
    unsigned char R, G, B;
    R = (unsigned char) ((unsigned)((c & 0xE0)>>5) * 255 / 7 );
    G = (unsigned char) ((unsigned)((c & 0x1C)>>2) * 255 / 7 );
    B = (unsigned char) ((unsigned) (c & 0x03) * 255 / 3 );
    RGBColor ret = {R, G, B};
    return ret;
}

RGBColor Convert_15bpp_to_RGB(Color_15Bpp c)
{
    unsigned char R, G, B;
    R = (unsigned char) ((unsigned)((c & 0x7C00)>>10) * 255 / 31 );
    G = (unsigned char) ((unsigned)((c & 0x03E0)>>5) * 255 / 31 );
    B = (unsigned char) ((unsigned) (c & 0x001F) * 255 / 31 );
    RGBColor ret = {R, G, B};
    return ret;
}

RGBColor Convert_16bpp_to_RGB(Color_16Bpp c)
{
    unsigned char R, G, B;
    R = (unsigned char) ((unsigned)((c & 0xF800)>>11) * 255 / 31 );
    G = (unsigned char) ((unsigned)((c & 0x07E0)>>5) * 255 / 63 );
    B = (unsigned char) ((unsigned) (c & 0x001F) * 255 / 31 );
    RGBColor ret = {R, G, B};
    return ret;
}

RGBColor Convert_18bpp_to_RGB(Color_18Bpp c)
{
    unsigned char R, G, B;
    R = (unsigned char) ((unsigned)(c.R) * 255 / 0x3F );
    G = (unsigned char) ((unsigned)(c.G) * 255 / 0x3F);
    B = (unsigned char) ((unsigned)(c.B) * 255 / 0x3F);
    RGBColor ret = {R, G, B};
    return ret;
}

RGBColor Convert_24bpp_to_RGB(Color_24Bpp c)
{
    return c;
}


Color_1Bpp Convert_RGB_to_1bpp(RGBColor c)
{
    if (((unsigned)c.R + (unsigned)c.G + (unsigned)c.B) / 3 >= 128) return 1;
    return 0;
}

Color_4Bpp Convert_RGB_to_4bpp(RGBColor c)
{
    int i; int minim = 0xFFFF; int index = 0;
    int R, G, B;

    for (i = 0; i < 16; i++)
    {
        R = (int)(c.R) - (int)(RGBColors_4bpp[i].R);
        G = (int)(c.G) - (int)(RGBColors_4bpp[i].G);
        B = (int)(c.B) - (int)(RGBColors_4bpp[i].B);

        R = abs(R) + abs(G) + abs(B);
        if (R <= minim) {
            minim = R; index = i;
        }
    }

    return index;
}

Color_6Bpp Convert_RGB_to_6bpp(RGBColor c)
{
    Color_6Bpp temp = 0; unsigned tmp;
    tmp = (unsigned)(c.R) * 3 / 255; temp |= (tmp & 0x03) << 4;
    tmp = (unsigned)(c.G) * 3 / 255; temp |= (tmp & 0x03) << 2;
    tmp = (unsigned)(c.B) * 3 / 255; temp |= (tmp & 0x03);
    return temp;
}

Color_8Bpp Convert_RGB_to_8bpp(RGBColor c)
{
    Color_8Bpp temp = 0; unsigned tmp;
    tmp = (unsigned)(c.R) * 7 / 255; temp |= (tmp & 0x07) << 5;
    tmp = (unsigned)(c.G) * 7 / 255; temp |= (tmp & 0x07) << 2;
    tmp = (unsigned)(c.B) * 3 / 255; temp |= (tmp & 0x03);
    return temp;
}

Color_15Bpp Convert_RGB_to_15bpp(RGBColor c)
{
    Color_15Bpp temp = 0; unsigned tmp;
    tmp = (unsigned)(c.R) * 0x1F / 255; temp |= (tmp & 0x1F) << 10;
    tmp = (unsigned)(c.G) * 0x1F / 255; temp |= (tmp & 0x1F) << 5;
    tmp = (unsigned)(c.B) * 0x1F / 255; temp |= (tmp & 0x1F);
    return temp;
}

Color_16Bpp Convert_RGB_to_16bpp(RGBColor c)
{
    Color_16Bpp temp = 0; unsigned tmp;
    tmp = (unsigned)(c.R) * 0x1F / 255; temp |= (tmp & 0x1F) << 11;
    tmp = (unsigned)(c.G) * 0x3F / 255; temp |= (tmp & 0x3F) << 5;
    tmp = (unsigned)(c.B) * 0x1F / 255; temp |= (tmp & 0x1F);
    return temp;
}

Color_18Bpp Convert_RGB_to_18bpp(RGBColor c)
{
    Color_18Bpp temp; unsigned tmp;
    tmp = (unsigned)(c.R) * 0x3F / 255; temp.R = (unsigned char)tmp;
    tmp = (unsigned)(c.G) * 0x3F / 255; temp.G = (unsigned char)tmp;
    tmp = (unsigned)(c.B) * 0x3F / 255; temp.B = (unsigned char)tmp;
    return temp;
}

Color_24Bpp Convert_RGB_to_24bpp(RGBColor c)
{
    return c;
}