Themes and palettes

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PlayGuard draws every screen in two choices of Preferences:

• Theme: light, dark (the default) or the console's.
• Palette: the colours. Default is PlayGuard's own (navy, or cool white in the light theme, with teal), then the palettes that come with it, then the theme files you add. The palette is also the last line of the theme list (−, or the theme button in the header).

Both apply at once, on every screen, without starting PlayGuard again. A palette made for one theme only (the high-contrast ones, Ocean, Sand) sets Theme to it; choosing the other theme afterwards changes the palette too, to its other half when it has one (High contrast light and High contrast dark), else back to Default (the theme list says which beforehand). The other palettes follow Theme.

The palettes that come with PlayGuard

They come from Aurore, the library PlayGuard is built on, and their names are in every language of the console.

Seasonal changes by itself: on the day a season or a feast begins, the screens take its palette at midnight, or as soon as the console wakes up. The seasons are the northern hemisphere's; Aurore's theme guide has the exact days.

Adding your own

1. Write a theme file (below) and give it a name ending in .theme. A theme with pictures is a folder instead: its file is named theme.theme, its pictures are next to it (Pictures).
2. Copy the file, or the whole folder, to the SD card, in config/playguard/themes/ (make the folder if it is not there). In the simulator on a computer, the folder is playguard_data/themes/, next to the data PlayGuard keeps there.
3. Preferences › Palette lists it under its name, after the palettes that come with PlayGuard. Choose it: every screen takes it at once.

A file with a mistake PlayGuard cannot read past (a missing included file or picture, a file that is not a theme) is left out of the list; a line it cannot read is skipped, the rest of the file used. Both are written to the session log (config/playguard/logs/sessions/), with the file and the line. Should the chosen file be removed from the card, PlayGuard's own colours come back.

Writing a theme file

A theme file is text: key = value lines, [sections], and # comments. Three lines are enough:

name = Mint
inherit = dark
accent = #3ddc97

• name, and optionally author, version and description: what the list shows. icon: the motif drawn on the palette's row, in its accent over a swatch of its colours: snowflake, heart, lantern, blossom, sun, wave, leaf, pumpkin, tree, firework, gem, dune, contrast, moon, bolt or sparkle (the default), or any other of Cadran's icons.
• inherit: what the file starts from, dark (when it says nothing), light, one of the palettes above (builtin:ocean, builtin:amethyst, builtin:sand, builtin:high-contrast-dark, builtin:high-contrast-light) or another file of the folder. Everything it does not say comes from there.
• The palette: background, surface (the cards), text, accent, warning and danger. Each one sets every colour that follows from it: text the quieter inks of the notes and captions, accent the focus ring, the active tab, the switches and the ring of the play timer, and so on. The inks are darkened or lightened until they read on the background and the cards.
• [light] and [dark]: a palette or keys for one theme only. A file with both sections styles both themes, and PlayGuard's Theme chooses which one shows.
• counterpart, for a file that styles one theme only: the file (or preset, builtin:…) with the other one, which PlayGuard switches to when the other theme is chosen (counterpart = mint-day.theme).
• [colors]: any single colour by its key (the lists below), over what the palette gave.
• Colours: #rgb, #rrggbb, #rrggbbaa, rgb(r, g, b) or rgba(r, g, b, a) (a from 0 to 1).
• @include other.inc: the lines of another file of the folder, at that place (name it .inc, so that it is not listed as a palette of its own).

Every key PlayGuard draws with is a theme key: Aurore's (brls/…), Cadran's, the look PlayGuard shares with PlayShelf (cadran/…), and PlayGuard's own (playguard/…). Aurore's theme guide lists the first two with what each one colours, and what each palette key sets.

PlayGuard's own keys

The loading screen's background and text are the theme's (brls/background, cadran/text2), as on every screen, and so is its background picture.

Readable text

After reading a file, PlayGuard checks that what must stay readable still is: the text and the inks on the background and on the cards (4.5:1), the focus ring (3:1), and its own playguard/badge/ink on cadran/coral (3:1). A pair under its minimum is written to the session log, for example cadran/text3 on cadran/surf reads badly: 3.9:1, under 4.5:1; the theme is used all the same. The palettes that come with PlayGuard pass every check.

Two examples

Both files are in docs/themes/, ready to copy (a theme folder with pictures is below).

mint.theme: PlayGuard's dark look with another accent.

name = Mint
author = PlayGuard
version = 1
description = The dark look, a mint accent.

inherit = dark
accent = #3ddc97

paper.theme: both themes, and one of PlayGuard's own keys.

name = Paper and ink
author = PlayGuard
version = 1
description = Warm paper by day, warm ink by night, a terracotta accent.

[light]
background = #f4efe6
surface = #fffaf2
text = #2b2622
accent = #a4502a
warning = #8a5a00
danger = #b3261e

[dark]
background = #17130f
surface = #221c17
text = #f0e7da
accent = #e39a6b
warning = #f2b84b
danger = #ff8a80

[colors]
playguard/ring/tip = #fff1dc

Pictures

A theme folder can bring pictures: a background behind every screen, a logo, some of the icons, PlayGuard's loading picture, a thumbnail for the palette list, and decorations. PNG or JPEG; each key names a file of the folder (or of one of its subfolders): a path that goes out of the folder (/…, sdmc:/…, ../…) is refused, the line skipped and written to the session log. A key at the top of the file is for both themes; in [light] or [dark], for that one only. Without these keys nothing changes.

config/playguard/themes/
├── mint.theme          # a single file
└── dusk/               # a theme folder
    ├── theme.theme
    ├── night.jpg
    └── icons/settings.png

The background

The text is checked on the picture under its veil (its average colour): when it reads badly, the session log says so, and a darker or lighter background (or a stronger background_dim) brings it back. A picture of 1920 × 1080 or less is best; a larger one is made smaller when loaded.

The logo, the icons and PlayGuard's pictures

PlayGuard's pictures a theme may replace (its image slots):

image.playguard/loading/art = loading.png
[light]
image.playguard/loading/wordmark = name-day.png
[dark]
image.playguard/loading/wordmark = name-night.png

Decorations

The seasonal palettes that come with PlayGuard have gentle particles of their own: snow in winter and at Christmas, petals in spring, leaves in autumn, embers at Halloween, confetti for the New Year, hearts on Valentine's Day, gold sparkles for the Lunar New Year (particles = none in a file built on one takes them away). Particles move only when the look may move: with Preferences › Visual effects at Reduced motion, or at Automatic with the console in hand, there are none at all, only the palette. After a minute without a button pressed they fade out and stop, until the next press.

A theme folder: Dusk

dusk/ has a starry night sky behind the dark theme and the dawn behind the light one, a logo for each, its own loading picture, a tinted settings icon, stars hanging from the top of the screen at night, sparkles drifting behind the screens, and a preview for the palette list. To install it, copy the whole dusk folder into config/playguard/themes/ (on a computer, playguard_data/themes/), so that the file is config/playguard/themes/dusk/theme.theme, then choose Dusk in Preferences › Palette. Its pictures are drawn by tools/make_example_theme.py, and weigh about 100 KB together.

# A theme folder: this file is theme.theme, its pictures are next to it.
# Copy the whole dusk/ folder into config/playguard/themes/ (docs/themes.md).
# The pictures are drawn by tools/make_example_theme.py.
name = Dusk
author = PlayGuard
version = 1
description = A starry sky at night, the dawn by day, with a logo and a loading picture of its own.
icon = moon

# Behind every screen: the sky, the cards slightly see-through over it
background_fit = cover
surface_opacity = 0.88

# The palette list shows this picture instead of a swatch of the colours
preview = preview.png

# The loading screen's picture (an image slot of PlayGuard's)
image.playguard/loading/art = loading.png

# Cadran's settings icon (the rail, Preferences), drawn in the icon's colour
icon.settings = icons/settings.png
icon.settings.tint = true

# A few stars twinkling behind the screens (not with reduced motion)
particles = sparkles
particles_density = low

[light]
background = #f1edf4
surface = #fdfbff
text = #2a2238
accent = #6a3a7c
warning = #8a5a00
danger = #b3261e
background_image = day.jpg
background_dim = 0.6
logo = logo-light.png
# Over the picture, a little darker than the palette makes them
cadran/text3 = #574d66
brls/header/subtitle = #574d66

[dark]
background = #1b1838
surface = #26224a
text = #f4eefb
accent = #ffc496
warning = #f2b84b
danger = #ff8a80
background_image = night.jpg
background_dim = 0.3
logo = logo-dark.png
# Stars hanging from the top of the screen, repeated sideways
decor.top = stars.png
decor.top_fit = tile

What keeps its colours

• The PIN gate of a forwarder protected with the PIN (config/playguard/gate.nro) is a small program of its own, without PlayGuard's library: it keeps PlayGuard's own colours, in the light or dark theme.
• PlayGuard's logo (the header's mark, the loading screen's icon) and the wordmark, unless the theme gives pictures for them (logo, image.…, above), and the French flag in About.
• The QR codes stay dark on white, as phones read them best.
• The games' covers and icons.

The choice is kept in config.json (theme, theme_file: see config.md).

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