/* * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Hyra nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include static struct gfx_ctx ctx; static ssize_t rand_bytes(char *buf, size_t len) { ssize_t retval; int fd; fd = open("/dev/random", O_RDONLY); if (fd < 0) { return fd; } if ((retval = read(fd, buf, len)) < 0) { close(fd); return retval; } close(fd); return retval; } static void screensave(void) { size_t n_iter = 0; /* Monotonic */ struct timespec ts; char randbuf[2]; color_t curpix, nextpix; uint8_t step = 0; ts.tv_sec = 0; ts.tv_nsec = 70000000; /* Begin the radiation ::) */ for (;;) { rand_bytes(randbuf, sizeof(randbuf)); for (size_t i = 0; i < (ctx.fb_size / 4) - 1; i += step + 1) { curpix = ctx.io[i]; nextpix = ctx.io[i + 1]; /* If a multiple of 15, AND, otherwise XOR */ if ((n_iter & 15) != 0) { curpix ^= randbuf[0] & 3; nextpix ^= (curpix | (nextpix << 1)); nextpix ^= step; } else { curpix &= randbuf[0] & 3; nextpix &= (curpix | (nextpix << 1)); nextpix &= step; } ctx.io[i] = curpix; ctx.io[i + 1] = nextpix; } sleep(&ts, &ts); if ((++step) > 50) { step = 0; } ++n_iter; } } int main(void) { int error; error = gfx_init(&ctx); if (error < 0) { printf("could not init libgfx\n"); return error; } screensave(); gfx_cleanup(&ctx); return 0; }