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tools/bmp_logo.c
4.37 KB
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#include "compiler.h" |
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enum { MODE_GEN_INFO, MODE_GEN_DATA }; |
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typedef struct bitmap_s { /* bitmap description */ uint16_t width; uint16_t height; uint8_t palette[256*3]; uint8_t *data; } bitmap_t; #define DEFAULT_CMAP_SIZE 16 /* size of default color map */ |
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void usage(const char *prog) { fprintf(stderr, "Usage: %s [--gen-info|--gen-data] file ", prog); } |
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/* * Neutralize little endians. */ uint16_t le_short(uint16_t x) { uint16_t val; uint8_t *p = (uint8_t *)(&x); val = (*p++ & 0xff) << 0; val |= (*p & 0xff) << 8; return val; } void skip_bytes (FILE *fp, int n) { while (n-- > 0) fgetc (fp); } |
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__attribute__ ((__noreturn__)) int error (char * msg, FILE *fp) { fprintf (stderr, "ERROR: %s ", msg); fclose (fp); exit (EXIT_FAILURE); } |
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void gen_info(bitmap_t *b, uint16_t n_colors) { printf("/* " " * Automatically generated by \"tools/bmp_logo\" " " * " " * DO NOT EDIT " " * " " */ " "#ifndef __BMP_LOGO_H__ " "#define __BMP_LOGO_H__ " "#define BMP_LOGO_WIDTH\t\t%d " "#define BMP_LOGO_HEIGHT\t\t%d " "#define BMP_LOGO_COLORS\t\t%d " "#define BMP_LOGO_OFFSET\t\t%d " "extern unsigned short bmp_logo_palette[]; " "extern unsigned char bmp_logo_bitmap[]; " "#endif /* __BMP_LOGO_H__ */ ", b->width, b->height, n_colors, DEFAULT_CMAP_SIZE); } |
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int main (int argc, char *argv[]) { |
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int mode, i, x; |
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FILE *fp; bitmap_t bmp; bitmap_t *b = &bmp; |
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uint16_t data_offset, n_colors; |
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if (argc < 3) { usage(argv[0]); |
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exit (EXIT_FAILURE); } |
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if (!strcmp(argv[1], "--gen-info")) mode = MODE_GEN_INFO; else if (!strcmp(argv[1], "--gen-data")) mode = MODE_GEN_DATA; else { usage(argv[0]); exit(EXIT_FAILURE); } fp = fopen(argv[2], "rb"); if (!fp) { perror(argv[2]); |
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exit (EXIT_FAILURE); } |
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if (fgetc (fp) != 'B' || fgetc (fp) != 'M') error ("Input file is not a bitmap", fp); |
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/* * read width and height of the image, and the number of colors used; |
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* ignore the rest */ |
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skip_bytes (fp, 8); |
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if (fread (&data_offset, sizeof (uint16_t), 1, fp) != 1) error ("Couldn't read bitmap data offset", fp); |
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skip_bytes (fp, 6); |
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if (fread (&b->width, sizeof (uint16_t), 1, fp) != 1) error ("Couldn't read bitmap width", fp); |
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skip_bytes (fp, 2); |
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if (fread (&b->height, sizeof (uint16_t), 1, fp) != 1) error ("Couldn't read bitmap height", fp); |
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skip_bytes (fp, 22); |
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if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1) error ("Couldn't read bitmap colors", fp); |
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skip_bytes (fp, 6); /* * Repair endianess. */ |
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data_offset = le_short(data_offset); |
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b->width = le_short(b->width); b->height = le_short(b->height); n_colors = le_short(n_colors); /* assume we are working with an 8-bit file */ if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) { /* reserve DEFAULT_CMAP_SIZE color map entries for default map */ n_colors = 256 - DEFAULT_CMAP_SIZE; } |
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if (mode == MODE_GEN_INFO) { gen_info(b, n_colors); goto out; } printf("/* " |
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" * Automatically generated by \"tools/bmp_logo\" " " * " " * DO NOT EDIT " " * " " */ " |
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"#ifndef __BMP_LOGO_DATA_H__ " "#define __BMP_LOGO_DATA_H__ "); |
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/* allocate memory */ |
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if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) error ("Error allocating memory for file", fp); |
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/* read and print the palette information */ |
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printf("unsigned short bmp_logo_palette[] = { "); |
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for (i=0; i<n_colors; ++i) { b->palette[(int)(i*3+2)] = fgetc(fp); b->palette[(int)(i*3+1)] = fgetc(fp); b->palette[(int)(i*3+0)] = fgetc(fp); x=fgetc(fp); |
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printf ("%s0x0%X%X%X,%s", ((i%8) == 0) ? "\t" : " ", |
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(b->palette[(int)(i*3+0)] >> 4) & 0x0F, (b->palette[(int)(i*3+1)] >> 4) & 0x0F, (b->palette[(int)(i*3+2)] >> 4) & 0x0F, |
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((i%8) == 7) ? " " : "" |
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); |
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} |
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/* seek to offset indicated by file header */ fseek(fp, (long)data_offset, SEEK_SET); |
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/* read the bitmap; leave room for default color map */ printf (" "); printf ("}; "); printf (" "); |
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printf("unsigned char bmp_logo_bitmap[] = { "); |
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for (i=(b->height-1)*b->width; i>=0; i-=b->width) { for (x = 0; x < b->width; x++) { |
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b->data[i + x] = (uint8_t) fgetc(fp) |
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+ DEFAULT_CMAP_SIZE; } } |
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for (i=0; i<(b->height*b->width); ++i) { if ((i%8) == 0) putchar ('\t'); printf ("0x%02X,%c", b->data[i], ((i%8) == 7) ? ' ' : ' ' ); } printf (" " "}; " |
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"#endif /* __BMP_LOGO_DATA_H__ */ " |
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); |
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out: fclose(fp); return 0; |
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} |