A new bootsplash system for FreeBSD

A bootsplash theme is a kernel module which implements these functions using API described below.

• void bstheme_early_init(int screen_size_y, int screen_size_x): Draw image before kernel thread mechanism is activated.
• void bstheme_init(void): Add a kernel thread to update screen periodically if needed.
• void bstheme_kmsg(const char *msg): Print a message if needed. msg is a kernel messsages
• void bstheme_update(int percentage): Advance the position of progress bar if needed.
• void bstheme_uninit(void): Go back into text mode.

The bootsplash system holds a array of struct bs_layer below. Themes receives pointers of them by ns_new_*_layer*() and manipulate variables.

struct bs_layer{
  void* data;             /* The pointer to content of a file/text. */
  int screen_y, screen_x; /* Position on screen. */
  int image_y, image_x;   /* Stating on the image.     It is unused in text layers. */
  int height;             /* The height of this layer. It is unused in text layers. */
  int width;              /* The width of this layer.  It is unused in text layers. */
  int visibility;         /* If visiblility is NOT 0, this layer will be drawn by bs_draw_layers(). */
  int z-index;            /* The stack order of layers. A layer with the greater value is drawn above layers with lesser value. */
};

• void bootsplash_drawImage(const char *filename): Draw image (.pcx or .bmp) in the screen. It determines file type by the extension.
• struct bs_layer *bs_new_image_layer(const char *filename): Create a layer with a image (.pcx or .bmp) file. I want to support .png files with libpng.
• struct bs_layer *bs_new_text_layer(const char *text): Create a layer with a text.
• void bs_draw_layers(): Draw layers.
• void bs_go_back_into_text_mode(): Go back into text mode.

loader(8) loads bootsplash theme as a kernel module and load images in /boot/splash as splash_image.

• bstheme_early_init(): is called before copyright printed.
• bstheme_init(): is called after kernel thread mechanism is activated.
• bstheme_kmsg(): is called each lines of kernel messages.
• bstheme_update(): is called before each SYSINIT element initialization.
• bstheme_uninit(): is called after kernel initialization has finished. I want to let it be called just before login(1) has started but I have no good idea to implement it.

Load splash images by /boot/splash/splash.4th (auto generated)

# loader.rc
include /boot/splash/splash.4th
 
# splash.4th
load -t splash_image /boot/splash/image_1.bmp
load -t splash_image /boot/splash/image_2.bmp
 
# ...

I'll develop a theme which can parse an extended configuration file based on https://wiki.freebsd.org/OliverFromme/BootLoader. It makes creating bootsplash theme more easier. The extended theme.conf looks like this:

theme_background="/boot/themes/default/biglogo.pcx"
theme_font="/boot/themes/default/default.font"
theme_bgcolor="0 0 0"           # black
theme_fgcolor="255 255 255"     # white
theme_options_xy="64 10"
theme_actions_xy="64 82"
 
# ***** extended configuration are as follows *****
theme_on_kernel_init_enable="YES" # it enables configurations below
 
#
#  Bootsplash system loads files specified in `theme_progress_images' to draw a progress bar.
#  `%' will be replaced with 10,20,30,...,100.
#  You have to prepare progress_bar10.pcx, progress_bar20.pcx, ..., progress_bar100.pcx in /boot/themes/default.
#
theme_progress_bar_enable="YES"
theme_progress_bar_images="/boot/themes/default/progress_bar%.pcx"
theme_progress_bar_xy="150 300"
 
#
#  Bootsplash system loads files speicifed in `theme_boot_animation_images' to render a animation on boot.
#  `%' will be replaced with 1,2,3,...,100.
#  You have to prepare animation1.pcx at least in /boot/themes/default.
#
theme_boot_animation_enable="YES"
theme_boot_animation_images="/boot/themes/default/animation%.pcx"
theme_boot_animation_xy="150 100"
theme_boot_animation_fps="15"
theme_boot_animation_repeat="YES"
 
# Bootsplash system updates it per lines.
theme_boot_kmsg_enable="YES"
theme_boot_kmsg_xy = "150 400"