diff options
Diffstat (limited to 'bin/psf2png.c')
| -rw-r--r-- | bin/psf2png.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/bin/psf2png.c b/bin/psf2png.c new file mode 100644 index 00000000..1aaa8635 --- /dev/null +++ b/bin/psf2png.c @@ -0,0 +1,107 @@ +/* Copyright (C) 2018 C. McEnroe <june@causal.agency> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <err.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> +#include <unistd.h> + +#include "png.h" + +int main(int argc, char *argv[]) { + uint32_t cols = 32; + const char *str = NULL; + uint32_t fg = 0xFFFFFF; + uint32_t bg = 0x000000; + + int opt; + while (0 < (opt = getopt(argc, argv, "b:c:f:s:"))) { + switch (opt) { + break; case 'b': bg = strtoul(optarg, NULL, 16); + break; case 'c': cols = strtoul(optarg, NULL, 0); + break; case 'f': fg = strtoul(optarg, NULL, 16); + break; case 's': str = optarg; + break; default: return EX_USAGE; + } + } + if (!cols && str) cols = strlen(str); + if (!cols) return EX_USAGE; + + const char *path = NULL; + if (optind < argc) path = argv[optind]; + + FILE *file = path ? fopen(path, "r") : stdin; + if (!file) err(EX_NOINPUT, "%s", path); + if (!path) path = "(stdin)"; + + struct { + uint32_t magic; + uint32_t version; + uint32_t size; + uint32_t flags; + struct { + uint32_t len; + uint32_t size; + uint32_t height; + uint32_t width; + } glyph; + } header; + size_t len = fread(&header, sizeof(header), 1, file); + if (ferror(file)) err(EX_IOERR, "%s", path); + if (len < 1) errx(EX_DATAERR, "%s: truncated header", path); + + uint32_t widthBytes = (header.glyph.width + 7) / 8; + uint8_t glyphs[header.glyph.len][header.glyph.height][widthBytes]; + len = fread(glyphs, header.glyph.size, header.glyph.len, file); + if (ferror(file)) err(EX_IOERR, "%s", path); + if (len < header.glyph.len) { + errx(EX_DATAERR, "%s: truncated glyphs", path); + } + fclose(file); + + uint32_t count = (str ? strlen(str) : header.glyph.len); + uint32_t width = header.glyph.width * cols; + uint32_t rows = (count + cols - 1) / cols; + uint32_t height = header.glyph.height * rows; + + pngHead(stdout, width, height, 8, PNGIndexed); + uint8_t pal[] = { + bg >> 16, bg >> 8, bg, + fg >> 16, fg >> 8, fg, + }; + pngPalette(stdout, pal, sizeof(pal)); + + uint8_t data[height][1 + width]; + memset(data, PNGNone, sizeof(data)); + + for (uint32_t i = 0; i < count; ++i) { + uint32_t row = header.glyph.height * (i / cols); + uint32_t col = 1 + header.glyph.width * (i % cols); + uint32_t g = (str ? str[i] : i); + for (uint32_t y = 0; y < header.glyph.height; ++y) { + for (uint32_t x = 0; x < header.glyph.width; ++x) { + uint8_t bit = glyphs[g][y][x / 8] >> (7 - x % 8) & 1; + data[row + y][col + x] = bit; + } + } + } + + pngData(stdout, (uint8_t *)data, sizeof(data)); + pngTail(stdout); +} |