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video/logo: allow custom logo

Some people like to replace the default Tux boot logo by an image of
their own. There exist a few tutorials here [1] and there [2]. But
this requires modifying the source tree which is a bit cumbersome.

Add a string entry in Kbuild for each of the logo categories
(monochrome, 16-colors, 224-colors). The string entry takes a path to
a .pbm or .ppm image allowing the user to more easily provide a custom
logo without having to modify the sources.

Add an help entry with a short hint on how to convert images to the
portable pixmap file format.

Update the Makefile accordingly. When converted to .c file, the logo
will have one of these fixed file name:

- logo_linux_mono.c
- logo_linux_vga16.c
- logo_linux_clut224.c:

depending on the image type and this regardless of the name of the
.pgm/.ppm source filename. This will allow for further simplifications
in an upcoming change.

[1] ArmadeuS Project wiki -- Linux Boot Logo
Link: https://www.armadeus.org/wiki/index.php?title=Linux_Boot_Logo

[2] Timesys -- How To Use a Custom Boot Logo / Splash Screen
Link: https://linuxlink.timesys.com/docs/wiki/engineering/HOWTO_Use_a_custom_boot_logo

Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Signed-off-by: Helge Deller <deller@gmx.de>

authored by

Vincent Mailhol and committed by
Helge Deller dfa6ce63 a7aa2b51

+51 -1
+41
drivers/video/logo/Kconfig
··· 22 22 bool "Standard black and white Linux logo" 23 23 default y 24 24 25 + config LOGO_LINUX_MONO_FILE 26 + string "Monochrome logo .pbm file" 27 + depends on LOGO_LINUX_MONO 28 + default "drivers/video/logo/logo_linux_mono.pbm" 29 + help 30 + Takes a path to a monochromatic logo in the portable pixmap file 31 + format (.pbm). This defaults to the Tux penguin. 32 + 33 + For example, the below ImageMagick command can be used to reduce 34 + an image to black and white and convert it into a pbm file: 35 + 36 + magick source_image -compress none destination.pbm 37 + 25 38 config LOGO_LINUX_VGA16 26 39 bool "Standard 16-color Linux logo" 27 40 default y 28 41 42 + config LOGO_LINUX_VGA16_FILE 43 + string "16-color logo .ppm file" 44 + depends on LOGO_LINUX_VGA16 45 + default "drivers/video/logo/logo_linux_vga16.ppm" 46 + help 47 + Takes a path to a logo in the portable pixmap file format (.ppm), 48 + using the 16 colors from the drivers/video/logo/clut_vga16.ppm 49 + palette. This defaults to the Tux penguin. 50 + 51 + For example, the below ImageMagick command can be used to reduce an 52 + image to the VGA 16 colors palette and convert into a ppm file: 53 + 54 + magick source_image -compress none \ 55 + -remap drivers/video/logo/clut_vga16.ppm destination.ppm 56 + 29 57 config LOGO_LINUX_CLUT224 30 58 bool "Standard 224-color Linux logo" 31 59 default y 60 + 61 + config LOGO_LINUX_CLUT224_FILE 62 + string "224-color logo .ppm file" 63 + depends on LOGO_LINUX_CLUT224 64 + default "drivers/video/logo/logo_linux_clut224.ppm" 65 + help 66 + Takes a path to a 224-color logo in the portable pixmap file 67 + format (.ppm). This defaults to the Tux penguin. 68 + 69 + For example, the below ImageMagick command can be used to reduce 70 + an image palette to 224 colors and convert it into a ppm file: 71 + 72 + magick source_image -compress none -colors 224 destination.ppm 32 73 33 74 config LOGO_DEC_CLUT224 34 75 bool "224-color Digital Equipment Corporation Linux logo"
+10 -1
drivers/video/logo/Makefile
··· 22 22 23 23 # Create commands like "pnmtologo -t mono -n logo_mac_mono -o ..." 24 24 quiet_cmd_logo = LOGO $@ 25 - cmd_logo = $(obj)/pnmtologo -t $2 -n $* -o $@ $< 25 + cmd_logo = $(obj)/pnmtologo -t $2 -n $(basename $(notdir $@)) -o $@ $< 26 + 27 + $(obj)/logo_linux_mono.c: $(CONFIG_LOGO_LINUX_MONO_FILE) $(obj)/pnmtologo FORCE 28 + $(call if_changed,logo,mono) 29 + 30 + $(obj)/logo_linux_vga16.c: $(CONFIG_LOGO_LINUX_VGA16_FILE) $(obj)/pnmtologo FORCE 31 + $(call if_changed,logo,vga16) 32 + 33 + $(obj)/logo_linux_clut224.c: $(CONFIG_LOGO_LINUX_CLUT224_FILE) $(obj)/pnmtologo FORCE 34 + $(call if_changed,logo,clut224) 26 35 27 36 $(obj)/%.c: $(src)/%.pbm $(obj)/pnmtologo FORCE 28 37 $(call if_changed,logo,mono)