Allow setting custom color palettes based on user profile color for all paletted graphics

[DieGo367]

What's changed?

• Allows using the user profile color for all images in the grf folder. (Allow using the user profile color on more skin elements #2083)
• Enabling user palettes is now also allowed in 3DS skins.
• Adds a system for defining sets of color palettes to overwrite the default one(s). (Allow customization of palette when using the user profile color in custom skins #2089)
• The progress bar and spinning squares animation now use the user profile color by default.
• When the user profile color is disabled on the progress bar, its color can now also be changed via the ProgressBarColor option in theme.ini.

For each image, you may define a set of color palettes for each possible user profile color. These take the form of .bin files in the new palettes folder. They work like boxart and custom banners; box.bin will apply to box.bmp. The format is very simple: each palette is 32 bytes long (16 colors with 2 bytes each). These use the same color codes as in theme.ini. The palettes are stored one after another, in order of the profile colors (Grey-Blue, Brown, Red, Pink, Orange, Yellow, Lime, Green, Dark Green, Turquoise, Light Blue, Blue, Dark Blue, Violet, Purple, Magenta). This means each palette file is 512 bytes. It should be straightforward enough to create these with any hex editor or even online tools such as hexed.it, although it's certainly very tedious.

There is one extra palette file that doesn't apply to an image. username.bin will apply to the username when UsernameUserPalette is enabled. This one is also a special case in that each palette is only 4 colors, so the file should only be 128 bytes.

I've made an example skin based on the DSi light theme that simply tints the box textures in the user's color.

Even just recoloring this one texture and creating the palette file proved to be a lot of trouble so ideally there'd be a tool to help with creating them, but I haven't made anything like that yet.

The files in the palettes folder won't apply to a particular image unless its UserPalette option is enabled. Otherwise, they fallback to the built in palette. A few specific textures have a different fallback palette then the rest, they are noted in the table below. Here is the updated list of UserPalette options:

Option name	DSi Default	3DS Default	Note
BipsUserPalette	false
BoxUserPalette	false
BoxEmptyUserPalette		false
BoxFullUserPalette		false
BraceUserPalette	false
BubbleUserPalette	false	false
ButtonArrowUserPalette	true
CornerButtonUserPalette	false
CursorUserPalette	false	false	Shares control with StartBorderUserPalette because their textures load in the same place. Uses a unique fallback palette because of this.
DialogBoxUserPalette	true	false
FolderUserPalette	false	false
LaunchDotsUserPalette	true
MovingArrowUserPalette	true
ProgressUserPalette	true	true
ScrollWindowUserPalette	false
SmallCartUserPalette	false	false
StartBorderUserPalette	true	false	Uses a unique fallback palette. Shares control with CursorUserPalette because their textures load in the same place.
StartTextUserPalette	true		Uses a unique fallback palette.
WirelessIconsUserPalette	false	false
IconA26UserPalette	false	false
IconCOLUserPalette	false	false
IconGBUserPalette	false	false
IconGBAUserPalette	false	false
IconGBAModeUserPalette	false	false
IconGGUserPalette	false	false
IconIMGUserPalette	false	false
IconINTUserPalette	false	false
IconM5UserPalette	false	false
IconManualUserPalette	false	false
IconMDUserPalette	false	false
IconNESUserPalette	false	false
IconNGPUserPalette	false	false
IconPCEUserPalette	false	false
IconPLGUserPalette	false	false
IconSettingsUserPalette	false	false
IconSGUserPalette	false	false
IconSMSUserPalette	false	false
IconSNESUserPalette	false	false
IconUnknownUserPalette	false	false
IconWSUserPalette	false	false
UsernameUserPalette	true	true	Not an image, refers to the coloring of the username text.
ProgressBarPalette	true	true	Not an image, refers to the coloring of the loading screen progress bar.

Where have you tested it?

melonDS 0.9.5
DSi with Unlaunch

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Pull Request status

• This PR has been tested using the latest version of devkitARM and libnds.

[spellboundtriangle]

Even just recoloring this one texture and creating the palette file proved to be a lot of trouble so ideally there'd be a tool to help with creating them, but I haven't made anything like that yet.

This seems like it may work well as a GIMP plugin. Would something external be better though?