source: rtems/c/src/lib/libbsp/arm/nds/tools/ndstool/source/banner.cpp @ 9a12c7e5

#include "ndstool.h"
#include "raster.h"
#include "banner.h"
#include "crc.h"

const char *bannerLanguages[] = { "Japanese", "English", "French", "German", "Italian", "Spanish" };

#define RGB16(r,g,b)                    ((r) | (g<<5) | (b<<10))

/*
 * RGBQuadToRGB16
 */
inline unsigned short RGBQuadToRGB16(RGBQUAD quad)
{
        unsigned short r = quad.rgbRed;
        unsigned short g = quad.rgbGreen;
        unsigned short b = quad.rgbBlue;
        return RGB16(r>>3, g>>3, b>>3);
}

/*
 * CalcBannerCRC
 */
unsigned short CalcBannerCRC(Banner &banner)
{
        return CalcCrc16((unsigned char *)&banner + 32, 0x840 - 32);
}

/*
 * IconFromBMP
 */
void IconFromBMP()
{
        CRaster bmp;
        int rval = bmp.LoadBMP(bannerfilename);
        if (rval < 0) exit(1);

        if (bmp.width != 32 || bmp.height != 32) {
                fprintf(stderr, "Image should be 32 x 32.\n");
                exit(1);
        }

        Banner banner;
        memset(&banner, 0, sizeof(banner));
        banner.version = 1;

        // tile data (4 bit / tile, 4x4 total tiles)
        // 32 bytes per tile (in 4 bit mode)
        for (int row=0; row<4; row++)
        {
                for (int col=0; col<4; col++)
                {
                        for (int y=0; y<8; y++)
                        {
                                for (int x=0; x<8; x+=2)
                                {
                                        unsigned char b0 = bmp[row*8 + y][col*8 + x + 0];
                                        unsigned char b1 = bmp[row*8 + y][col*8 + x + 1];
                                        banner.tile_data[row][col][y][x/2] = (b1 << 4) | b0;
                                }
                        }
                }
        }

        // palette
        for (int i = 0; i < 16; i++)
        {
                banner.palette[i] = RGBQuadToRGB16(bmp.palette[i]);
        }

        // put title
        for (int i=0; bannertext[i]; i++)
        {
                char c = bannertext[i];
                if (c == ';') c = 0x0A;
                for (int l=0; l<6; l++)
                {
                        banner.title[l][i] = c;
                }
        }
        
        // calculate CRC
        banner.crc = CalcBannerCRC(banner);

        fwrite(&banner, 1, sizeof(banner), fNDS);
}