commit 03ab864bf4cf2b837d8261780251594e506fb354
Author: Pollux <pollux@pollux.codes>
Date: Sat, 7 Mar 2026 15:08:06 +0000
Initial commit
Signed-off-by: Pollux <pollux@pollux.codes>
Diffstat:
| A | .gitignore | | | 4 | ++++ |
| A | LICENSE | | | 674 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Makefile | | | 16 | ++++++++++++++++ |
| A | README | | | 36 | ++++++++++++++++++++++++++++++++++++ |
| A | config.def.h | | | 26 | ++++++++++++++++++++++++++ |
| A | config.mk | | | 17 | +++++++++++++++++ |
| A | splashdown-openrc-plugin.c | | | 99 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | splashdown.c | | | 240 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
8 files changed, 1112 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,4 @@
+config.h
+splashdown
+splashdown-static
+splashdown-openrc-plugin.so
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,674 @@
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+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,16 @@
+include config.mk
+
+splashdown: splashdown.c config.h config.mk
+ gcc $(CFLAGS) -o splashdown splashdown.c $(LDFLAGS)
+
+plugin: splashdown-openrc-plugin.so
+splashdown-openrc-plugin.so: splashdown-openrc-plugin.c config.h config.mk
+ gcc $(CFLAGS) -fPIC -shared -o splashdown-openrc-plugin.so splashdown-openrc-plugin.c $(LDFLAGS)
+
+config.h:
+ cp config.def.h config.h
+
+clean:
+ -rm splashdown splashdown-openrc-plugin.so
+
+.PHONY: clean
diff --git a/README b/README
@@ -0,0 +1,36 @@
+splashdown - minimal bootsplash program
+=======================================
+
+splashdown is a minimal, daemon-less bootsplash program. When called, it draws
+a user-specified image to the framebuffer and renders text from the command
+line on top of it.
+
+Requirements
+------------
+To build, splashdown depends on freetype2 and libjpeg-turbo.
+
+librc is also required if using the included openrc plugin
+
+Installation
+------------
+Copy config.def.h to config.h, then edit it and config.mk to your liking. To
+build and install splashdown, use make and copy the resulting executable to your
+path.
+
+From this point, the exact means of using splashdown during bootup and shutdown
+varies significantly between systems. It is recommended to use a custom
+initramfs and call splashdown after each phase of the boot process.
+
+It is also recommended to use chvt to switch to a dedicated tty for splashdown,
+and to pass console=tty<n> to the kernel to put boot messages on a separate tty
+(so they don't overwrite splashdown).
+
+If using openrc, the openrc plugin can be used to preserve splashdown through
+the openrc service initialization process and to also show it during shutdown.
+To install the plugin, run "make plugin" and copy the resulting shared object
+file to the openrc plugin directory.
+
+Acknowledgements
+----------------
+- The suckless software organization for their philosophy.
+- Amadeusz Żołnowski and Matt Jolly for showing how to make an openrc plugin.
diff --git a/config.def.h b/config.def.h
@@ -0,0 +1,26 @@
+/*
+ * Make sure to enable CONFIG_FB_DEVICE in your kernel.
+ * This shouldn't need to be modified.
+ */
+#define FB_DEV "/dev/fb0"
+
+/* Exclude particular OpenRC services when using OpenRC plugin */
+static const char *openrc_exclude[] = {""};
+
+/* Paths to search for splash images. */
+static const char *image_paths[] = {
+ "/etc/splashdown/splash.jpg"
+};
+
+/* Paths to search for fonts. */
+static const char *fonts[] = {
+ "/etc/splashdown/font.ttf",
+ "/usr/share/fonts/dejavu/DejaVuSansMono.ttf"
+};
+
+/* Size, color, and position of text. */
+static const int font_size = 32;
+static const int font_color = 0xffffff;
+
+static const int margin_x = 96;
+static const int margin_y = 96;
diff --git a/config.mk b/config.mk
@@ -0,0 +1,17 @@
+VERSION = 0.0
+
+PREFIX = /usr/local
+PLUGINPREFIX = /usr/lib64/rc/plugins
+
+CFLAGS = -std=c99 -s -Os -Wall -Wextra -Wpedantic -Wno-unused-variable -I/usr/include/freetype2 -D_POSIX_C_SOURCE=200809L
+
+# DEBUG BUILD
+# CFLAGS = -std=c99 -s -O0 -g3 -Wall -Wextra -Wpedantic -Wno-unused-variable -fsanitize=address,undefined -fsanitize-trap=all -fanalyzer -I/usr/include/freetype2 -D_POSIX_C_SOURCE=200809L
+
+# FOR DYNAMIC BUILD
+LDFLAGS = -lfreetype -ljpeg -lrc
+
+# FOR STATIC BUILD (ONLY SPLASHDOWN EXECUTABLE)
+# LDFLAGS = -lfreetype -lbz2 -ljpeg -lz -ljpeg
+
+CC = cc
diff --git a/splashdown-openrc-plugin.c b/splashdown-openrc-plugin.c
@@ -0,0 +1,99 @@
+/*
+ * splashdown - minimal bootsplash program
+ * Copyright (C) 2026 Pollux <pollux@pollux.codes>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <rc.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define LENGTH(X) (sizeof (X) / sizeof (X)[0])
+
+#include "config.h"
+
+void
+die(const char *fmt, ...) {
+ va_list ap;
+ int saved_errno;
+
+ saved_errno = errno;
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+
+ if(fmt[0] && fmt[strlen(fmt) - 1] == ':')
+ fprintf(stderr, " %s", strerror(saved_errno));
+ fputc('\n', stderr);
+ exit(1);
+}
+
+int run_splashdown(char* message, char* service) {
+
+ char cmd[128];
+ cmd[0] = '\0';
+
+ strcpy(cmd, "splashdown '");
+ strcat(cmd, message);
+ strcat(cmd, service);
+ strcat(cmd, "...'");
+
+ int rv = system(cmd);
+
+ return rv;
+}
+
+int
+rc_plugin_hook(RC_HOOK hook, const char *name) {
+
+ int rv = 0;
+
+ char name_cpy[256];
+ strcpy(name_cpy, name);
+
+ char* runlevel = rc_runlevel_get();
+
+ for(uint32_t i = 0; i < LENGTH(openrc_exclude); i++) {
+ if(!strcmp(name_cpy, openrc_exclude[i])) {
+ goto end;
+ }
+ }
+
+ switch(hook) {
+ case RC_HOOK_SERVICE_START_NOW:
+ if(run_splashdown("Starting ", name_cpy)){
+ rv=1;
+ }
+ break;
+ case RC_HOOK_SERVICE_STOP_NOW:
+ if(run_splashdown("Stopping ", name_cpy)){
+ rv=1;
+ }
+ break;
+ default:
+ break;
+ }
+
+end:
+
+ free(runlevel);
+ return rv;
+}
diff --git a/splashdown.c b/splashdown.c
@@ -0,0 +1,240 @@
+/*
+ * splashdown - minimal bootsplash program
+ * Copyright (C) 2026 Pollux <pollux@pollux.codes>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <stdarg.h>
+#include <linux/fb.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include <stdio.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <jpeglib.h>
+
+#include <freetype/freetype.h>
+#include FT_FREETYPE_H
+
+#define LENGTH(X) (sizeof (X) / sizeof (X)[0])
+#define MIN(A, B) ((A) < (B) ? (A) : (B))
+
+struct image_buffer {
+ uint32_t width;
+ uint32_t height;
+ uint32_t *data;
+};
+
+void die(const char *fmt, ...);
+int mmap_fb(struct image_buffer *fb);
+void draw_banner(struct image_buffer src, int srcx, int srcy, int srcw, int srch, struct image_buffer dest, int destx, int desty);
+void draw_glyph(struct image_buffer buffer, FT_Bitmap bitmap, int x, int y, uint32_t color);
+void draw_text(struct image_buffer buffer, int x, int y, FT_Face face, uint32_t color, const char* text, size_t len);
+int read_jpeg(const char* path, struct image_buffer *buffer);
+
+#include "config.h"
+
+void
+die(const char *fmt, ...) {
+ va_list ap;
+ int saved_errno;
+
+ saved_errno = errno;
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+
+ if(fmt[0] && fmt[strlen(fmt) - 1] == ':')
+ fprintf(stderr, " %s", strerror(saved_errno));
+ fputc('\n', stderr);
+ exit(1);
+}
+
+void
+draw_buffer(struct image_buffer src, uint32_t srcx, uint32_t srcy, uint32_t srcw, uint32_t srch, struct image_buffer dest, uint32_t destx, uint32_t desty) {
+
+ srcw = MIN(srcw, src.width);
+ srch = MIN(srch, src.height);
+
+ srcw = MIN(srcw, dest.width - destx);
+ srch = MIN(srch, dest.height - desty);
+
+ int row_bytes = srcw * sizeof(uint32_t);
+ for(uint32_t y = 0; y < srch; y++) {
+ memcpy(dest.data + dest.width*(desty+y) + destx, src.data + src.width*(y + srcy) + srcx, row_bytes);
+ }
+}
+
+void
+draw_glyph(struct image_buffer buffer, FT_Bitmap bitmap, int x, int y, uint32_t color) {
+ for(uint32_t py = 0; py < bitmap.rows; py++) {
+ for(uint32_t px = 0; px < bitmap.width; px++) {
+ uint8_t a = bitmap.buffer[bitmap.pitch * py + px];
+ uint32_t bg = buffer.data[(y+py)*buffer.width + x + px];
+
+ uint16_t r = bg >> 16 & 0xff;
+ uint16_t g = bg >> 8 & 0xff;
+ uint16_t b = bg >> 0 & 0xff;
+
+ uint16_t r_t = color >> 16 & 0xff;
+ uint16_t g_t = color >> 8 & 0xff;
+ uint16_t b_t = color >> 0 & 0xff;
+
+ r = (r * (255-a) + r_t * a) / 255;
+ g = (g * (255-a) + g_t * a) / 255;
+ b = (b * (255-a) + b_t * a) / 255;
+
+ buffer.data[(y+py)*buffer.width + x + px] = b | g << 8 | r << 16;
+ }
+ }
+}
+
+void
+draw_text(struct image_buffer buffer, int x, int y, FT_Face face, uint32_t color, const char* text, size_t len) {
+
+ int e, pen_x = x;
+
+ for(uint32_t n = 0; n < len; n++) {
+ e = FT_Load_Char(face, text[n], FT_LOAD_RENDER);
+ if (e) continue;
+
+ draw_glyph(buffer, face->glyph->bitmap, pen_x + face->glyph->bitmap_left, y - face->glyph->bitmap_top, color);
+
+ pen_x += face->glyph->advance.x >> 6;
+ }
+}
+
+int
+mmap_fb(struct image_buffer *fb) {
+ int fd = open(FB_DEV, O_RDWR);
+ struct fb_var_screeninfo fb_info;
+ int e = ioctl(fd, FBIOGET_VSCREENINFO, &fb_info);
+ if(e) return -1;
+ fb->width = fb_info.xres;
+ fb->height = fb_info.yres;
+ uint32_t fb_size = fb->width * fb->height * 4;
+ fb->data = mmap(NULL, fb_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ close(fd);
+ return 0;
+}
+
+int
+read_jpeg(const char* path, struct image_buffer *buffer) {
+ FILE *fd;
+
+ fd = fopen(path, "rb");
+ if(fd == NULL) return -1;
+
+ struct jpeg_error_mgr jerr;
+ struct jpeg_decompress_struct cinfo;
+
+ cinfo.err = jpeg_std_error(&jerr);
+
+ jpeg_create_decompress(&cinfo);
+ jpeg_stdio_src(&cinfo, fd);
+ if(jpeg_read_header(&cinfo, TRUE) != JPEG_HEADER_OK) goto bail;
+ if(!jpeg_start_decompress(&cinfo)) goto bail;
+
+ buffer->width = cinfo.output_width;
+ buffer->height = cinfo.output_height;
+
+ int pixels = buffer->width * buffer->height;
+ buffer->data = malloc(pixels * sizeof(uint32_t));
+
+ int row_stride = cinfo.output_width * cinfo.output_components;
+
+ JSAMPARRAY working_buffer = (cinfo.mem->alloc_sarray)((j_common_ptr)&cinfo, JPOOL_IMAGE, row_stride, 1);
+
+ while(cinfo.output_scanline < cinfo.output_height) {
+ if(jpeg_read_scanlines(&cinfo, working_buffer, 1) != 1)
+ goto bail;
+ for(uint32_t x = 0; x < cinfo.output_width; x++)
+ buffer->data[buffer->width*(cinfo.output_scanline-1) + x] =
+ (working_buffer[0][x*3+2] & 0xff) |
+ ((working_buffer[0][x*3+1] & 0xff) << 8) |
+ ((working_buffer[0][x*3] & 0xff) << 16);
+ }
+
+ jpeg_finish_decompress(&cinfo);
+ jpeg_destroy_decompress(&cinfo);
+ return 0;
+
+bail:
+ jpeg_destroy_decompress(&cinfo);
+ if(buffer->data) free(buffer->data);
+ buffer->data = NULL;
+ return -1;
+}
+
+int
+main(const int argc, const char **argv) {
+
+ struct image_buffer splash_image = { .data=NULL };
+ struct image_buffer framebuffer = { .data=NULL };
+
+ const char *err = NULL;
+
+ const char *text = NULL;
+ if(argc > 1) text = argv[1];
+
+ FT_Library lib = NULL;
+ FT_Face face = NULL;
+ if(FT_Init_FreeType(&lib)) die("Could not load freetype2.");
+ for(uint32_t i = 0; i < LENGTH(fonts); i++)
+ if(!FT_New_Face(lib, fonts[i], 0, &face)) break;
+ if(!face) {
+ err = "Could not locate font.";
+ goto cleanup;
+ }
+
+ if(FT_Set_Pixel_Sizes(face, 0, font_size)){
+ err = "Could not set font properties.";
+ goto cleanup;
+ }
+
+ for(uint32_t i = 0; i < LENGTH(image_paths); i++)
+ if(read_jpeg(image_paths[i], &splash_image)) break;
+
+ if(!splash_image.data) {
+ err = "Could not open image.";
+ goto cleanup;
+ }
+
+ if(mmap_fb(&framebuffer)){
+ err = "Could not open framebuffer.";
+ goto cleanup;
+ }
+
+ if(text)
+ draw_text(splash_image, margin_x, margin_y, face, font_color, text, strlen(text));
+ draw_buffer(splash_image, 0, 0, splash_image.width, splash_image.height, framebuffer, 0, 0);
+
+cleanup:
+ if(framebuffer.data) munmap(framebuffer.data, framebuffer.width*framebuffer.height*sizeof(uint32_t));
+ if(splash_image.data) free(splash_image.data);
+ if(face) FT_Done_Face(face);
+ if(lib) FT_Done_FreeType(lib);
+ if(err) die(err);
+
+ return 0;
+}