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+import { invertLightness, brightness } from 'chromatism'
+import { alphaBlend, mixrgb } from '../color_convert/color_convert.js'
+/* This is a definition of all layer combinations
+ * each key is a topmost layer, each value represents layer underneath
+ * this is essentially a simplified tree
+ */
+export const LAYERS = {
+  undelay: null, // root
+  topBar: null, // no transparency support
+  badge: null, //  no transparency support
+  profileTint: null, // doesn't matter
+  fg: null,
+  bg: 'underlay',
+  highlight: 'bg',
+  panel: 'bg',
+  popover: 'bg',
+  selectedMenu: 'popover',
+  btn: 'bg',
+  btnPanel: 'panel',
+  btnTopBar: 'topBar',
+  input: 'bg',
+  inputPanel: 'panel',
+  inputTopBar: 'topBar',
+  alert: 'bg',
+  alertPanel: 'panel',
+  poll: 'bg'
+}
+
+/* By default opacity slots have 1 as default opacity
+ * this allows redefining it to something else
+ */
+export const DEFAULT_OPACITY = {
+  profileTint: 0.5,
+  alert: 0.5,
+  input: 0.5,
+  faint: 0.5,
+  underlay: 0.15
+}
+
+/**  SUBJECT TO CHANGE IN THE FUTURE, this is all beta
+ * Color and opacity slots definitions. Each key represents a slot.
+ *
+ * Short-hands:
+ * String beginning with `--` - value after dashes treated as sole
+ *     dependency - i.e. `--value` equivalent to { depends: ['value']}
+ * String beginning with `#` - value would be treated as solid color
+ *     defined in hexadecimal representation (i.e. #FFFFFF) and will be
+ *     used as default. `#FFFFFF` is equivalent to { default: '#FFFFFF'}
+ *
+ * Full definition:
+ * @property {String[]} depends - color slot names this color depends ones.
+ *   cyclic dependencies are supported to some extent but not recommended.
+ * @property {String} [opacity] - opacity slot used by this color slot.
+ *   opacity is inherited from parents. To break inheritance graph use null
+ * @property {Number} [priority] - EXPERIMENTAL. used to pre-sort slots so
+ *   that slots with higher priority come earlier
+ * @property {Function(mod, ...colors)} [color] - function that will be
+ *   used to determine the color. By default it just copies first color in
+ *   dependency list.
+ * @argument {Number} mod - `1` (light-on-dark) or `-1` (dark-on-light)
+ *   depending on background color (for textColor)/given color.
+ * @argument {...Object} deps - each argument after mod represents each
+ *   color from `depends` array. All colors take user customizations into
+ *   account and represented by { r, g, b } objects.
+ * @returns {Object} resulting color, should be in { r, g, b } form
+ *
+ * @property {Boolean|String} [textColor] - true to mark color slot as text
+ *   color. This enables automatic text color generation for the slot. Use
+ *   'preserve' string if you don't want text color to fall back to
+ *   black/white. Use 'bw' to only ever use black or white. This also makes
+ *   following properties required:
+ * @property {String} [layer] - which layer the text sit on top on - used
+ *   to account for transparency in text color calculation
+ *   layer is inherited from parents. To break inheritance graph use null
+ * @property {String} [variant] - which color slot is background (same as
+ *   above, used to account for transparency)
+ */
+export const SLOT_INHERITANCE = {
+  bg: {
+    depends: [],
+    opacity: 'bg',
+    priority: 1
+  },
+  fg: {
+    depends: [],
+    priority: 1
+  },
+  text: {
+    depends: [],
+    layer: 'bg',
+    opacity: null,
+    priority: 1
+  },
+  underlay: {
+    default: '#000000',
+    opacity: 'underlay'
+  },
+  link: {
+    depends: ['accent'],
+    priority: 1
+  },
+  accent: {
+    depends: ['link'],
+    priority: 1
+  },
+  faint: {
+    depends: ['text'],
+    opacity: 'faint'
+  },
+  faintLink: {
+    depends: ['link'],
+    opacity: 'faint'
+  },
+  postFaintLink: {
+    depends: ['postLink'],
+    opacity: 'faint'
+  },
+
+  cBlue: '#0000ff',
+  cRed: '#FF0000',
+  cGreen: '#00FF00',
+  cOrange: '#E3FF00',
+
+  profileBg: {
+    depends: ['bg'],
+    color: (mod, bg) => ({
+      r: Math.floor(bg.r * 0.53),
+      g: Math.floor(bg.g * 0.56),
+      b: Math.floor(bg.b * 0.59)
+    })
+  },
+  profileTint: {
+    depends: ['bg'],
+    layer: 'profileTint',
+    opacity: 'profileTint'
+  },
+
+  highlight: {
+    depends: ['bg'],
+    color: (mod, bg) => brightness(5 * mod, bg).rgb
+  },
+  highlightLightText: {
+    depends: ['lightText'],
+    layer: 'highlight',
+    textColor: true
+  },
+  highlightPostLink: {
+    depends: ['postLink'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightFaintText: {
+    depends: ['faint'],
+    layer: 'highlight',
+    textColor: true
+  },
+  highlightFaintLink: {
+    depends: ['faintLink'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightPostFaintLink: {
+    depends: ['postFaintLink'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightText: {
+    depends: ['text'],
+    layer: 'highlight',
+    textColor: true
+  },
+  highlightLink: {
+    depends: ['link'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightIcon: {
+    depends: ['highlight', 'highlightText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  popover: {
+    depends: ['bg'],
+    opacity: 'popover'
+  },
+  popoverLightText: {
+    depends: ['lightText'],
+    layer: 'popover',
+    textColor: true
+  },
+  popoverPostLink: {
+    depends: ['postLink'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverFaintText: {
+    depends: ['faint'],
+    layer: 'popover',
+    textColor: true
+  },
+  popoverFaintLink: {
+    depends: ['faintLink'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverPostFaintLink: {
+    depends: ['postFaintLink'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverText: {
+    depends: ['text'],
+    layer: 'popover',
+    textColor: true
+  },
+  popoverLink: {
+    depends: ['link'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverIcon: {
+    depends: ['popover', 'popoverText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  selectedPost: '--highlight',
+  selectedPostFaintText: {
+    depends: ['highlightFaintText'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: true
+  },
+  selectedPostLightText: {
+    depends: ['highlightLightText'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: true
+  },
+  selectedPostPostLink: {
+    depends: ['highlightPostLink'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: 'preserve'
+  },
+  selectedPostFaintLink: {
+    depends: ['highlightFaintLink'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: 'preserve'
+  },
+  selectedPostText: {
+    depends: ['highlightText'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: true
+  },
+  selectedPostLink: {
+    depends: ['highlightLink'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: 'preserve'
+  },
+  selectedPostIcon: {
+    depends: ['selectedPost', 'selectedPostText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  selectedMenu: {
+    depends: ['bg'],
+    color: (mod, bg) => brightness(5 * mod, bg).rgb
+  },
+  selectedMenuLightText: {
+    depends: ['highlightLightText'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: true
+  },
+  selectedMenuFaintText: {
+    depends: ['highlightFaintText'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: true
+  },
+  selectedMenuFaintLink: {
+    depends: ['highlightFaintLink'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: 'preserve'
+  },
+  selectedMenuText: {
+    depends: ['highlightText'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: true
+  },
+  selectedMenuLink: {
+    depends: ['highlightLink'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: 'preserve'
+  },
+  selectedMenuIcon: {
+    depends: ['selectedMenu', 'selectedMenuText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  selectedMenuPopover: {
+    depends: ['popover'],
+    color: (mod, bg) => brightness(5 * mod, bg).rgb
+  },
+  selectedMenuPopoverLightText: {
+    depends: ['selectedMenuLightText'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: true
+  },
+  selectedMenuPopoverFaintText: {
+    depends: ['selectedMenuFaintText'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: true
+  },
+  selectedMenuPopoverFaintLink: {
+    depends: ['selectedMenuFaintLink'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: 'preserve'
+  },
+  selectedMenuPopoverText: {
+    depends: ['selectedMenuText'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: true
+  },
+  selectedMenuPopoverLink: {
+    depends: ['selectedMenuLink'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: 'preserve'
+  },
+  selectedMenuPopoverIcon: {
+    depends: ['selectedMenuPopover', 'selectedMenuText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  lightText: {
+    depends: ['text'],
+    layer: 'bg',
+    textColor: 'preserve',
+    color: (mod, text) => brightness(20 * mod, text).rgb
+  },
+
+  postLink: {
+    depends: ['link'],
+    layer: 'bg',
+    textColor: 'preserve'
+  },
+
+  border: {
+    depends: ['fg'],
+    opacity: 'border',
+    color: (mod, fg) => brightness(2 * mod, fg).rgb
+  },
+
+  poll: {
+    depends: ['accent', 'bg'],
+    copacity: 'poll',
+    color: (mod, accent, bg) => alphaBlend(accent, 0.4, bg)
+  },
+  pollText: {
+    depends: ['text'],
+    layer: 'poll',
+    textColor: true
+  },
+
+  icon: {
+    depends: ['bg', 'text'],
+    inheritsOpacity: false,
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  // Foreground
+  fgText: {
+    depends: ['text'],
+    layer: 'fg',
+    textColor: true
+  },
+  fgLink: {
+    depends: ['link'],
+    layer: 'fg',
+    textColor: 'preserve'
+  },
+
+  // Panel header
+  panel: {
+    depends: ['fg'],
+    opacity: 'panel'
+  },
+  panelText: {
+    depends: ['text'],
+    layer: 'panel',
+    textColor: true
+  },
+  panelFaint: {
+    depends: ['fgText'],
+    layer: 'panel',
+    opacity: 'faint',
+    textColor: true
+  },
+  panelLink: {
+    depends: ['fgLink'],
+    layer: 'panel',
+    textColor: 'preserve'
+  },
+
+  // Top bar
+  topBar: '--fg',
+  topBarText: {
+    depends: ['fgText'],
+    layer: 'topBar',
+    textColor: true
+  },
+  topBarLink: {
+    depends: ['fgLink'],
+    layer: 'topBar',
+    textColor: 'preserve'
+  },
+
+  // Tabs
+  tab: {
+    depends: ['btn']
+  },
+  tabText: {
+    depends: ['btnText'],
+    layer: 'btn',
+    textColor: true
+  },
+  tabActiveText: {
+    depends: ['text'],
+    layer: 'bg',
+    textColor: true
+  },
+
+  // Buttons
+  btn: {
+    depends: ['fg'],
+    variant: 'btn',
+    opacity: 'btn'
+  },
+  btnText: {
+    depends: ['fgText'],
+    layer: 'btn',
+    textColor: true
+  },
+  btnPanelText: {
+    depends: ['btnText'],
+    layer: 'btnPanel',
+    variant: 'btn',
+    textColor: true
+  },
+  btnTopBarText: {
+    depends: ['btnText'],
+    layer: 'btnTopBar',
+    variant: 'btn',
+    textColor: true
+  },
+
+  // Buttons: pressed
+  btnPressed: {
+    depends: ['btn'],
+    layer: 'btn'
+  },
+  btnPressedText: {
+    depends: ['btnText'],
+    layer: 'btn',
+    variant: 'btnPressed',
+    textColor: true
+  },
+  btnPressedPanel: {
+    depends: ['btnPressed'],
+    layer: 'btn'
+  },
+  btnPressedPanelText: {
+    depends: ['btnPanelText'],
+    layer: 'btnPanel',
+    variant: 'btnPressed',
+    textColor: true
+  },
+  btnPressedTopBar: {
+    depends: ['btnPressed'],
+    layer: 'btn'
+  },
+  btnPressedTopBarText: {
+    depends: ['btnTopBarText'],
+    layer: 'btnTopBar',
+    variant: 'btnPressed',
+    textColor: true
+  },
+
+  // Buttons: toggled
+  btnToggled: {
+    depends: ['btn'],
+    layer: 'btn',
+    color: (mod, btn) => brightness(mod * 20, btn).rgb
+  },
+  btnToggledText: {
+    depends: ['btnText'],
+    layer: 'btn',
+    variant: 'btnToggled',
+    textColor: true
+  },
+  btnToggledPanelText: {
+    depends: ['btnPanelText'],
+    layer: 'btnPanel',
+    variant: 'btnToggled',
+    textColor: true
+  },
+  btnToggledTopBarText: {
+    depends: ['btnTopBarText'],
+    layer: 'btnTopBar',
+    variant: 'btnToggled',
+    textColor: true
+  },
+
+  // Buttons: disabled
+  btnDisabled: {
+    depends: ['btn', 'bg'],
+    color: (mod, btn, bg) => alphaBlend(btn, 0.25, bg)
+  },
+  btnDisabledText: {
+    depends: ['btnText', 'btnDisabled'],
+    layer: 'btn',
+    variant: 'btnDisabled',
+    color: (mod, text, btn) => alphaBlend(text, 0.25, btn)
+  },
+  btnDisabledPanelText: {
+    depends: ['btnPanelText', 'btnDisabled'],
+    layer: 'btnPanel',
+    variant: 'btnDisabled',
+    color: (mod, text, btn) => alphaBlend(text, 0.25, btn)
+  },
+  btnDisabledTopBarText: {
+    depends: ['btnTopBarText', 'btnDisabled'],
+    layer: 'btnTopBar',
+    variant: 'btnDisabled',
+    color: (mod, text, btn) => alphaBlend(text, 0.25, btn)
+  },
+
+  // Input fields
+  input: {
+    depends: ['fg'],
+    opacity: 'input'
+  },
+  inputText: {
+    depends: ['text'],
+    layer: 'input',
+    textColor: true
+  },
+  inputPanelText: {
+    depends: ['panelText'],
+    layer: 'inputPanel',
+    variant: 'input',
+    textColor: true
+  },
+  inputTopbarText: {
+    depends: ['topBarText'],
+    layer: 'inputTopBar',
+    variant: 'input',
+    textColor: true
+  },
+
+  alertError: {
+    depends: ['cRed'],
+    opacity: 'alert'
+  },
+  alertErrorText: {
+    depends: ['text'],
+    layer: 'alert',
+    variant: 'alertError',
+    textColor: true
+  },
+  alertErrorPanelText: {
+    depends: ['panelText'],
+    layer: 'alertPanel',
+    variant: 'alertError',
+    textColor: true
+  },
+
+  alertWarning: {
+    depends: ['cOrange'],
+    opacity: 'alert'
+  },
+  alertWarningText: {
+    depends: ['text'],
+    layer: 'alert',
+    variant: 'alertWarning',
+    textColor: true
+  },
+  alertWarningPanelText: {
+    depends: ['panelText'],
+    layer: 'alertPanel',
+    variant: 'alertWarning',
+    textColor: true
+  },
+
+  alertNeutral: {
+    depends: ['text'],
+    opacity: 'alert'
+  },
+  alertNeutralText: {
+    depends: ['text'],
+    layer: 'alert',
+    variant: 'alertNeutral',
+    color: (mod, text) => invertLightness(text).rgb,
+    textColor: true
+  },
+  alertNeutralPanelText: {
+    depends: ['panelText'],
+    layer: 'alertPanel',
+    variant: 'alertNeutral',
+    textColor: true
+  },
+
+  badgeNotification: '--cRed',
+  badgeNotificationText: {
+    depends: ['text', 'badgeNotification'],
+    layer: 'badge',
+    variant: 'badgeNotification',
+    textColor: 'bw'
+  }
+}