diff options
Diffstat (limited to 'utils/face2png.c')
| -rw-r--r-- | utils/face2png.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/utils/face2png.c b/utils/face2png.c new file mode 100644 index 0000000..a9a7c29 --- /dev/null +++ b/utils/face2png.c @@ -0,0 +1,165 @@ +/* + * Copyright © 2014 IIMarckus <imarckus@gmail.com> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <png.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> + +uint32_t +getint32BE(FILE *f) +{ + uint32_t n; + n = fgetc(f) << 24; + n |= fgetc(f) << 16; + n |= fgetc(f) << 8; + n |= fgetc(f); + + return n; +} + +void +printpng(uint16_t **pixels, int height, int width) +{ + png_structp png_ptr; + png_infop info_ptr; + int x, y; + png_byte **row_pointers; + int pixel_size; + int depth; + + png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, + NULL); + if (png_ptr == NULL) { + errx(1, "Could not create PNG write struct"); + } + + info_ptr = png_create_info_struct(png_ptr); + if (info_ptr == NULL) { + png_destroy_write_struct(&png_ptr, NULL); + errx(1, "Could not create PNG info struct"); + } + + if (setjmp (png_jmpbuf (png_ptr))) { + png_destroy_write_struct(&png_ptr, &info_ptr); + errx(1, "Internal PNG error"); + } + + depth = 8; + png_set_IHDR(png_ptr, info_ptr, width, height, depth, + PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); + + pixel_size = 3; + row_pointers = png_malloc(png_ptr, height * sizeof (png_byte *)); + for (y = 0; y < height; ++y) { + png_byte *row = png_malloc(png_ptr, + sizeof(uint8_t) * width * pixel_size); + row_pointers[y] = row; + for (x = 0; x < width; ++x) { + *row++ = (pixels[x][y] >> 11) << 3; + *row++ = ((pixels[x][y] >> 6) & 0x1f) << 3; + *row++ = ((pixels[x][y] >> 1) & 0x1f) << 3; + } + } + + png_init_io(png_ptr, stdout); + png_set_rows(png_ptr, info_ptr, row_pointers); + png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL); + + for (y = 0; y < height; y++) { + png_free(png_ptr, row_pointers[y]); + } + + png_free(png_ptr, row_pointers); + png_destroy_write_struct(&png_ptr, &info_ptr); +} + +int +main(int argc, char *argv[]) +{ + FILE *f; + int x, y; + uint16_t **pixels; + int height, width; + uint32_t nfaces; + uint32_t *offsets; + + if (argc != 2) { + errx(1, "Usage: face2png file"); + } + + f = fopen(argv[1], "rb"); + if (f == NULL) { + err(1, "Could not open file '%s'", argv[1]); + } + + height = 64; + width = 64; + + nfaces = getint32BE(f); + offsets = reallocarray(NULL, nfaces, sizeof *offsets); + + for (y = 0; y < nfaces; ++y) { + offsets[y] = getint32BE(f); + } + for (y = 0; y < nfaces; ++y) { + getint32BE(f); + } + + fseek(f, offsets[nfaces - 1], SEEK_SET); + + pixels = reallocarray(NULL, width, sizeof *pixels); + if (pixels == NULL) { + err(1, "Could not allocate memory"); + } + for (x = 0; x < width; ++x) { + pixels[x] = reallocarray(NULL, height, sizeof + *pixels[x]); + if (pixels[x] == NULL) { + err(1, "Could not allocate memory"); + } + } + + /* + * In the original format, on every other line, every other pair of + * pixels is swapped. Here we transpose it into top-bottom left-right. + */ + uint16_t q[4]; + for (y = 0; y < height; ++y) { + for (x = 0; x < width; ++x) { + if (y % 2 == 0) { + pixels[x][y] = fgetc(f) << 8; + pixels[x][y] |= fgetc(f); + } else { + q[x % 4] = fgetc(f) << 8; + q[x % 4] |= fgetc(f); + if (x % 4 == 3) { + pixels[x - 3][y] = q[2]; + pixels[x - 2][y] = q[3]; + pixels[x - 1][y] = q[0]; + pixels[x][y] = q[1]; + } + } + } + } + + printpng(pixels, height, width); + + fclose(f); + + return 0; +} |