uboot/tools/bmp_logo.c
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   1#include "compiler.h"
   2
   3enum {
   4        MODE_GEN_INFO,
   5        MODE_GEN_DATA
   6};
   7
   8typedef struct bitmap_s {               /* bitmap description */
   9        uint16_t width;
  10        uint16_t height;
  11        uint8_t palette[256*3];
  12        uint8_t *data;
  13} bitmap_t;
  14
  15#define DEFAULT_CMAP_SIZE       16      /* size of default color map    */
  16
  17void usage(const char *prog)
  18{
  19        fprintf(stderr, "Usage: %s [--gen-info|--gen-data] file\n", prog);
  20}
  21
  22/*
  23 * Neutralize little endians.
  24 */
  25uint16_t le_short(uint16_t x)
  26{
  27    uint16_t val;
  28    uint8_t *p = (uint8_t *)(&x);
  29
  30    val =  (*p++ & 0xff) << 0;
  31    val |= (*p & 0xff) << 8;
  32
  33    return val;
  34}
  35
  36void skip_bytes (FILE *fp, int n)
  37{
  38        while (n-- > 0)
  39                fgetc (fp);
  40}
  41
  42__attribute__ ((__noreturn__))
  43int error (char * msg, FILE *fp)
  44{
  45        fprintf (stderr, "ERROR: %s\n", msg);
  46
  47        fclose (fp);
  48
  49        exit (EXIT_FAILURE);
  50}
  51
  52void gen_info(bitmap_t *b, uint16_t n_colors)
  53{
  54        printf("/*\n"
  55                " * Automatically generated by \"tools/bmp_logo\"\n"
  56                " *\n"
  57                " * DO NOT EDIT\n"
  58                " *\n"
  59                " */\n\n\n"
  60                "#ifndef __BMP_LOGO_H__\n"
  61                "#define __BMP_LOGO_H__\n\n"
  62                "#define BMP_LOGO_WIDTH\t\t%d\n"
  63                "#define BMP_LOGO_HEIGHT\t\t%d\n"
  64                "#define BMP_LOGO_COLORS\t\t%d\n"
  65                "#define BMP_LOGO_OFFSET\t\t%d\n\n"
  66                "extern unsigned short bmp_logo_palette[];\n"
  67                "extern unsigned char bmp_logo_bitmap[];\n\n"
  68                "#endif /* __BMP_LOGO_H__ */\n",
  69                b->width, b->height, n_colors,
  70                DEFAULT_CMAP_SIZE);
  71}
  72
  73int main (int argc, char *argv[])
  74{
  75        int     mode, i, x;
  76        FILE    *fp;
  77        bitmap_t bmp;
  78        bitmap_t *b = &bmp;
  79        uint16_t data_offset, n_colors;
  80
  81        if (argc < 3) {
  82                usage(argv[0]);
  83                exit (EXIT_FAILURE);
  84        }
  85
  86        if (!strcmp(argv[1], "--gen-info"))
  87                mode = MODE_GEN_INFO;
  88        else if (!strcmp(argv[1], "--gen-data"))
  89                mode = MODE_GEN_DATA;
  90        else {
  91                usage(argv[0]);
  92                exit(EXIT_FAILURE);
  93        }
  94
  95        fp = fopen(argv[2], "rb");
  96        if (!fp) {
  97                perror(argv[2]);
  98                exit (EXIT_FAILURE);
  99        }
 100
 101        if (fgetc (fp) != 'B' || fgetc (fp) != 'M')
 102                error ("Input file is not a bitmap", fp);
 103
 104        /*
 105         * read width and height of the image, and the number of colors used;
 106         * ignore the rest
 107         */
 108        skip_bytes (fp, 8);
 109        if (fread (&data_offset, sizeof (uint16_t), 1, fp) != 1)
 110                error ("Couldn't read bitmap data offset", fp);
 111        skip_bytes (fp, 6);
 112        if (fread (&b->width,   sizeof (uint16_t), 1, fp) != 1)
 113                error ("Couldn't read bitmap width", fp);
 114        skip_bytes (fp, 2);
 115        if (fread (&b->height,  sizeof (uint16_t), 1, fp) != 1)
 116                error ("Couldn't read bitmap height", fp);
 117        skip_bytes (fp, 22);
 118        if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1)
 119                error ("Couldn't read bitmap colors", fp);
 120        skip_bytes (fp, 6);
 121
 122        /*
 123         * Repair endianess.
 124         */
 125        data_offset = le_short(data_offset);
 126        b->width = le_short(b->width);
 127        b->height = le_short(b->height);
 128        n_colors = le_short(n_colors);
 129
 130        /* assume we are working with an 8-bit file */
 131        if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) {
 132                /* reserve DEFAULT_CMAP_SIZE color map entries for default map */
 133                n_colors = 256 - DEFAULT_CMAP_SIZE;
 134        }
 135
 136        if (mode == MODE_GEN_INFO) {
 137                gen_info(b, n_colors);
 138                goto out;
 139        }
 140
 141        printf("/*\n"
 142                " * Automatically generated by \"tools/bmp_logo\"\n"
 143                " *\n"
 144                " * DO NOT EDIT\n"
 145                " *\n"
 146                " */\n\n\n"
 147                "#ifndef __BMP_LOGO_DATA_H__\n"
 148                "#define __BMP_LOGO_DATA_H__\n\n");
 149
 150        /* allocate memory */
 151        if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL)
 152                error ("Error allocating memory for file", fp);
 153
 154        /* read and print the palette information */
 155        printf("unsigned short bmp_logo_palette[] = {\n");
 156
 157        for (i=0; i<n_colors; ++i) {
 158                b->palette[(int)(i*3+2)] = fgetc(fp);
 159                b->palette[(int)(i*3+1)] = fgetc(fp);
 160                b->palette[(int)(i*3+0)] = fgetc(fp);
 161                x=fgetc(fp);
 162
 163                printf ("%s0x0%X%X%X,%s",
 164                        ((i%8) == 0) ? "\t" : "  ",
 165                        (b->palette[(int)(i*3+0)] >> 4) & 0x0F,
 166                        (b->palette[(int)(i*3+1)] >> 4) & 0x0F,
 167                        (b->palette[(int)(i*3+2)] >> 4) & 0x0F,
 168                        ((i%8) == 7) ? "\n" : ""
 169                );
 170        }
 171
 172        /* seek to offset indicated by file header */
 173        fseek(fp, (long)data_offset, SEEK_SET);
 174
 175        /* read the bitmap; leave room for default color map */
 176        printf ("\n");
 177        printf ("};\n");
 178        printf ("\n");
 179        printf("unsigned char bmp_logo_bitmap[] = {\n");
 180        for (i=(b->height-1)*b->width; i>=0; i-=b->width) {
 181                for (x = 0; x < b->width; x++) {
 182                        b->data[(uint16_t) i + x] = (uint8_t) fgetc (fp) \
 183                                                + DEFAULT_CMAP_SIZE;
 184                }
 185        }
 186
 187        for (i=0; i<(b->height*b->width); ++i) {
 188                if ((i%8) == 0)
 189                        putchar ('\t');
 190                printf ("0x%02X,%c",
 191                        b->data[i],
 192                        ((i%8) == 7) ? '\n' : ' '
 193                );
 194        }
 195        printf ("\n"
 196                "};\n\n"
 197                "#endif /* __BMP_LOGO_DATA_H__ */\n"
 198        );
 199
 200out:
 201        fclose(fp);
 202        return 0;
 203}
 204