diff options
Diffstat (limited to '')
| -rw-r--r-- | bin/gfxx.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/bin/gfxx.c b/bin/gfxx.c new file mode 100644 index 00000000..e5bf93da --- /dev/null +++ b/bin/gfxx.c @@ -0,0 +1,264 @@ +#include <err.h> +#include <fcntl.h> +#include <linux/fb.h> +#include <stdint.h> +#include <stdlib.h> +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sysexits.h> +#include <termios.h> +#include <unistd.h> + +struct Buffer { + uint32_t *data; + size_t xres; + size_t yres; +}; + +static int init(int argc, char *argv[]); +static void draw(struct Buffer buf); +static void input(char in); + +static struct termios saveTerm; +static void restoreTerm(void) { + tcsetattr(STDERR_FILENO, TCSADRAIN, &saveTerm); +} + +int main(int argc, char *argv[]) { + int error; + + error = init(argc, argv); + if (error) return error; + + const char *path = getenv("FRAMEBUFFER"); + if (!path) path = "/dev/fb0"; + + int fb = open(path, O_RDWR); + if (fb < 0) err(EX_OSFILE, "%s", path); + + struct fb_var_screeninfo info; + error = ioctl(fb, FBIOGET_VSCREENINFO, &info); + if (error) err(EX_IOERR, "%s", path); + + size_t size = 4 * info.xres * info.yres; + struct Buffer buf = { + .data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0), + .xres = info.xres, + .yres = info.yres, + }; + if (buf.data == MAP_FAILED) err(EX_IOERR, "%s", path); + + error = tcgetattr(STDERR_FILENO, &saveTerm); + if (error) err(EX_IOERR, "tcgetattr"); + atexit(restoreTerm); + + struct termios term = saveTerm; + term.c_lflag &= ~(ICANON | ECHO); + error = tcsetattr(STDERR_FILENO, TCSADRAIN, &term); + if (error) err(EX_IOERR, "tcsetattr"); + + for (;;) { + draw(buf); + + char in; + ssize_t len = read(STDERR_FILENO, &in, 1); + if (len < 0) err(EX_IOERR, "read"); + if (!len) return EX_DATAERR; + + input(in); + } +} + +// ABSTRACTION LINE + +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> + +static uint8_t bits = 1; +static bool endian; +static bool reverse; +static size_t width = 16; +static size_t offset; +static size_t scale = 1; + +static size_t size = 1024 * 1024; +static uint8_t *data; + +static uint8_t get(size_t i) { + if (reverse) { + return data[size - i - 1]; + } else { + return data[i]; + } +} + +static int init(int argc, char *argv[]) { + const char *path = NULL; + + int opt; + while (0 < (opt = getopt(argc, argv, "b:en:rw:z:"))) { + switch (opt) { + case 'b': bits = strtoul(optarg, NULL, 0); break; + case 'e': endian ^= true; break; + case 'n': offset = strtoul(optarg, NULL, 0); break; + case 'r': reverse ^= true; break; + case 'w': width = strtoul(optarg, NULL, 0); break; + case 'z': scale = strtoul(optarg, NULL, 0); break; + default: return EX_USAGE; + } + } + if (argc > optind) path = argv[optind]; + if (!bits || !width || !scale) return EX_USAGE; + + FILE *file = path ? fopen(path, "r") : stdin; + if (!file) err(EX_NOINPUT, "%s", path); + + if (path) { + struct stat stat; + int error = fstat(fileno(file), &stat); + if (error) err(EX_IOERR, "%s", path); + size = stat.st_size; + } + + data = malloc(size); + if (!data) err(EX_OSERR, "malloc(%zu)", size); + + size = fread(data, 1, size, file); + if (ferror(file)) err(EX_IOERR, "%s", path); + + return EX_OK; +} + +static void dump(void) { + printf( + "gfxx %s%s-b %hhu -n %zu -w %zu -z %zu\n", + reverse ? "-r " : "", + endian ? "-e " : "", + bits, + offset, + width, + scale + ); +} + +struct Cursor { + size_t left; + size_t x; + size_t y; +}; + +static struct Cursor step(struct Buffer buf, struct Cursor cur) { + cur.x++; + if (cur.x - cur.left == width) { + cur.y++; + cur.x = cur.left; + } + if (cur.y == buf.yres / scale) { + cur.left += width; + cur.x = cur.left; + cur.y = 0; + } + return cur; +} + +static void put(struct Buffer buf, struct Cursor cur, uint32_t p) { + size_t scaledX = cur.x * scale; + size_t scaledY = cur.y * scale; + for (size_t fillY = scaledY; fillY < scaledY + scale; ++fillY) { + if (fillY >= buf.yres) break; + for (size_t fillX = scaledX; fillX < scaledX + scale; ++fillX) { + if (fillX >= buf.xres) break; + buf.data[fillY * buf.xres + fillX] = p; + } + } +} + +// TODO: Palette. +static void draw1(struct Buffer buf) { + struct Cursor cur = {0}; + for (size_t i = offset; i < size; ++i) { + for (int s = 0; s < 8; ++s) { + uint8_t b = get(i) >> (endian ? s : 7 - s) & 1; + uint32_t p = b ? 0xFFFFFF : 0x000000; + put(buf, cur, p); + cur = step(buf, cur); + } + } +} + +// TODO: Palette. +static void draw8(struct Buffer buf) { + struct Cursor cur = {0}; + for (size_t i = offset; i < size; ++i) { + uint32_t p = get(i) | get(i) << 8 | get(i) << 16; + put(buf, cur, p); + cur = step(buf, cur); + } +} + +static void draw24(struct Buffer buf) { + struct Cursor cur = {0}; + for (size_t i = offset; i + 2 < size; i += 3) { + uint32_t p = (endian) + ? get(i) << 16 | get(i+1) << 8 | get(i+2) << 0 + : get(i) << 0 | get(i+1) << 8 | get(i+2) << 16; + put(buf, cur, p); + cur = step(buf, cur); + } +} + +static void draw32(struct Buffer buf) { + struct Cursor cur = {0}; + for (size_t i = offset; i + 3 < size; i += 4) { + uint32_t p = (endian) + ? get(i) << 24 | get(i+1) << 16 | get(i+2) << 8 | get(i+3) << 0 + : get(i) << 0 | get(i+1) << 8 | get(i+2) << 16 | get(i+3) << 24; + put(buf, cur, p); + cur = step(buf, cur); + } +} + +static void draw(struct Buffer buf) { + memset(buf.data, 0, 4 * buf.xres * buf.yres); + switch (bits) { + case 1: draw1(buf); break; + case 8: draw8(buf); break; + case 24: draw24(buf); break; + case 32: draw32(buf); break; + default: break; + } +} + +static void input(char in) { + switch (in) { + case 'q': dump(); exit(EX_OK); + break; case '+': scale++; + break; case '-': if (scale > 1) scale--; + break; case '.': width++; + break; case ',': if (width > 1) width--; + break; case '>': width *= 2; + break; case '<': if (width / 2 >= 1) width /= 2; + break; case 'h': if (offset) offset--; + break; case 'j': offset += width; + break; case 'k': if (offset >= width) offset -= width; + break; case 'l': offset++; + break; case 'e': endian ^= true; + break; case 'r': reverse ^= true; + break; case 'b': + switch (bits) { + case 1: bits = 8; break; + case 32: bits = 1; break; + default: bits += 8; + } + break; case 'B': + switch (bits) { + case 1: bits = 32; break; + case 8: bits = 1; break; + default: bits -= 8; + } + } +} |