diff options
Diffstat (limited to 'tools/gfx.c')
| -rw-r--r-- | tools/gfx.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/tools/gfx.c b/tools/gfx.c new file mode 100644 index 00000000..8c4066ab --- /dev/null +++ b/tools/gfx.c @@ -0,0 +1,296 @@ +#include <stdio.h> +#include <stdlib.h> +#include <stdbool.h> +#include <getopt.h> +#include <string.h> +#include <stdint.h> + +#include "common.h" + +static void usage(void) { + fprintf(stderr, "Usage: gfx [--trim-whitespace] [--remove-whitespace] [--interleave] [--remove-duplicates [--keep-whitespace]] [--remove-xflip] [--remove-yflip] [--png filename] [-d depth] [-h] [-o outfile] infile\n"); +} + +static void error(char *message) { + fputs(message, stderr); + fputs("\n", stderr); +} + +struct Options { + int trim_whitespace; + int remove_whitespace; + int help; + char *outfile; + int depth; + int interleave; + int remove_duplicates; + int keep_whitespace; + int remove_xflip; + int remove_yflip; + char *png_file; +}; + +struct Options Options = { + .depth = 2, +}; + +void get_args(int argc, char *argv[]) { + struct option long_options[] = { + {"remove-whitespace", no_argument, &Options.remove_whitespace, 1}, + {"trim-whitespace", no_argument, &Options.trim_whitespace, 1}, + {"interleave", no_argument, &Options.interleave, 1}, + {"remove-duplicates", no_argument, &Options.remove_duplicates, 1}, + {"keep-whitespace", no_argument, &Options.keep_whitespace, 1}, + {"remove-xflip", no_argument, &Options.remove_xflip, 1}, + {"remove-yflip", no_argument, &Options.remove_yflip, 1}, + {"png", required_argument, 0, 'p'}, + {"depth", required_argument, 0, 'd'}, + {"help", no_argument, 0, 'h'}, + {0} + }; + for (int opt = 0; opt != -1;) { + switch (opt = getopt_long(argc, argv, "ho:d:p:", long_options)) { + case 'h': + Options.help = true; + break; + case 'o': + Options.outfile = optarg; + break; + case 'd': + Options.depth = strtoul(optarg, NULL, 0); + break; + case 'p': + Options.png_file = optarg; + break; + case 0: + case -1: + break; + default: + usage(); + exit(1); + break; + } + } +} + +struct Graphic { + int size; + uint8_t *data; +}; + +bool is_whitespace(uint8_t *tile, int tile_size) { + uint8_t WHITESPACE = 0; + for (int i = 0; i < tile_size; i++) { + if (tile[i] != WHITESPACE) { + return false; + } + } + return true; +} + +void trim_whitespace(struct Graphic *graphic) { + int tile_size = Options.depth * 8; + for (int i = graphic->size - tile_size; i > 0; i -= tile_size) { + if (is_whitespace(&graphic->data[i], tile_size)) { + graphic->size = i; + } else { + break; + } + } +} + +void remove_whitespace(struct Graphic *graphic) { + int tile_size = Options.depth * 8; + if (Options.interleave) tile_size *= 2; + int i = 0; + for (int j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) { + while (is_whitespace(&graphic->data[j], tile_size)) { + j += tile_size; + } + if (j >= graphic->size) { + break; + } + if (j > i) { + memcpy(&graphic->data[i], &graphic->data[j], tile_size); + } + } + graphic->size = i; +} + +bool tile_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles) { + for (int i = 0; i < num_tiles; i++) { + bool match = true; + for (int j = 0; j < tile_size; j++) { + if (tile[j] != tiles[i * tile_size + j]) { + match = false; + } + } + if (match) { + return true; + } + } + return false; +} + +void remove_duplicates(struct Graphic *graphic) { + int tile_size = Options.depth * 8; + if (Options.interleave) tile_size *= 2; + int num_tiles = 0; + for (int i = 0, j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) { + while (tile_exists(&graphic->data[j], graphic->data, tile_size, num_tiles)) { + if (Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) { + break; + } + j += tile_size; + } + if (j >= graphic->size) { + break; + } + if (j > i) { + memcpy(&graphic->data[i], &graphic->data[j], tile_size); + } + num_tiles++; + } + graphic->size = num_tiles * tile_size; +} + +bool flip_exists(uint8_t *tile, uint8_t *tiles, int tile_size, int num_tiles, bool xflip, bool yflip) { + uint8_t *flip = calloc(tile_size, 1); + int half_size = tile_size / 2; + for (int i = 0; i < tile_size; i++) { + int byte = i; + if (yflip) { + byte = tile_size - 1 - (i ^ 1); + if (Options.interleave && i < half_size) { + byte = half_size - 1 - (i ^ 1); + } + } + if (xflip) { + for (int bit = 0; bit < 8; bit++) { + flip[byte] |= ((tile[i] >> bit) & 1) << (7 - bit); + } + } else { + flip[byte] = tile[i]; + } + } + if (tile_exists(flip, tiles, tile_size, num_tiles)) { + return true; + } + return false; +} + +void remove_flip(struct Graphic *graphic, bool xflip, bool yflip) { + int tile_size = Options.depth * 8; + if (Options.interleave) tile_size *= 2; + int num_tiles = 0; + for (int i = 0, j = 0; i < graphic->size && j < graphic->size; i += tile_size, j += tile_size) { + while (flip_exists(&graphic->data[j], graphic->data, tile_size, num_tiles, xflip, yflip)) { + if (Options.keep_whitespace && is_whitespace(&graphic->data[j], tile_size)) { + break; + } + j += tile_size; + } + if (j >= graphic->size) { + break; + } + if (j > i) { + memcpy(&graphic->data[i], &graphic->data[j], tile_size); + } + num_tiles++; + } + graphic->size = num_tiles * tile_size; +} + +void interleave(struct Graphic *graphic, int width) { + int tile_size = Options.depth * 8; + int width_tiles = width / 8; + int num_tiles = graphic->size / tile_size; + uint8_t *interleaved = malloc(graphic->size); + for (int i = 0; i < num_tiles; i++) { + int tile = i * 2; + int row = i / width_tiles; + tile -= width_tiles * row; + if (row % 2) { + tile -= width_tiles; + tile += 1; + } + memcpy(&interleaved[tile * tile_size], &graphic->data[i * tile_size], tile_size); + } + graphic->size = num_tiles * tile_size; + memcpy(graphic->data, interleaved, graphic->size); + free(interleaved); +} + +int png_get_width(char *filename) { + FILE *f = fopen_verbose(filename, "rb"); + if (!f) { + exit(1); + } + + const int OFFSET_WIDTH = 16; + uint8_t bytes[4]; + fseek(f, OFFSET_WIDTH, SEEK_SET); + size_t size = 4; + size_t result = fread(bytes, 1, size, f); + fclose(f); + if (result != size) { + fprintf(stderr, "Could not read file at offset 0x%x: \"%s\"\n", OFFSET_WIDTH, filename); + exit(1); + } + + int width = 0; + for (int i = 0; i < 4; i++) { + width |= bytes[i] << (8 * (3 - i)); + } + return width; +} + + +int main(int argc, char *argv[]) { + get_args(argc, argv); + argc -= optind; + argv += optind; + if (Options.help) { + usage(); + return 0; + } + if (argc < 1) { + usage(); + exit(1); + } + char *infile = argv[0]; + struct Graphic graphic; + graphic.data = read_u8(infile, &graphic.size); + if (Options.trim_whitespace) { + trim_whitespace(&graphic); + } + if (Options.interleave) { + if (!Options.png_file) { + error("interleave: need --png to infer dimensions"); + usage(); + exit(1); + } + int width = png_get_width(Options.png_file); + interleave(&graphic, width); + } + if (Options.remove_duplicates) { + remove_duplicates(&graphic); + } + if (Options.remove_xflip) { + remove_flip(&graphic, true, false); + } + if (Options.remove_yflip) { + remove_flip(&graphic, false, true); + } + if (Options.remove_xflip && Options.remove_yflip) { + remove_flip(&graphic, true, true); + } + if (Options.remove_whitespace) { + remove_whitespace(&graphic); + } + if (Options.outfile) { + write_u8(Options.outfile, graphic.data, graphic.size); + } + free(graphic.data); + return 0; +} |