Merge pull request #177 from yenatch/rgbgfx

Use rgbgfx and c tools instead of the submodule.

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;
+}