perf: utilize builder for initializing effect defaults

Author: rachartier

lua/tiny-glimmer/animation/effect.lua

@@ -1,19 +1,29 @@
 ---@class Effect
 ---@field settings table
 ---@field update_fn function
+---@field build_starter function
+---@field starter table
 
 local Effect = {}
 Effect.__index = Effect
 
-function Effect.new(settings, update_fn)
+function Effect.new(settings, update_fn, builder)
 	local self = setmetatable({}, Effect)
 
 	self.settings = settings
 	self.update_fn = update_fn
 
+	self._starter_builder = builder
+
 	return self
 end
 
+function Effect:build_starter()
+	if self._starter_builder then
+		self.starter = self._starter_builder(self)
+	end
+end
+
 function Effect:update_settings(settings)
 	self.settings = settings
 end

lua/tiny-glimmer/glimmer_animation.lua

@@ -34,6 +34,8 @@ function GlimmerAnimation.new(effect, opts)
 	local self = setmetatable({}, GlimmerAnimation)
 
 	self.effect = effect
+	self.effect:build_starter()
+
 	self.default_effect_settings = vim.deepcopy(effect.settings)
 
 	self.range = opts.range

lua/tiny-glimmer/premade_effects.lua

@@ -3,14 +3,20 @@ local easing_functions = require("tiny-glimmer.animation.easing")
 local Effect = require("tiny-glimmer.animation.effect")
 
 local function create_effect(opts)
-	return Effect.new({}, opts.update_fn)
+	return Effect.new({}, opts.update_fn, opts.builder)
 end
 
 return {
 	fade = create_effect({
+		builder = function(self)
+			return {
+				initial = utils.hex_to_rgb(self.settings.from_color),
+				final = utils.hex_to_rgb(self.settings.to_color),
+			}
+		end,
 		update_fn = function(self, progress, ease)
-			local initial = utils.hex_to_rgb(self.settings.from_color)
-			local final = utils.hex_to_rgb(self.settings.to_color)
+			local initial = self.starter.initial
+			local final = self.starter.final
 			local current = {}
 
 			local fn = easing_functions[ease]
@@ -25,9 +31,15 @@ return {
 		end,
 	}),
 	reverse_fade = create_effect({
+		builder = function(self)
+			return {
+				initial = utils.hex_to_rgb(self.settings.from_color),
+				final = utils.hex_to_rgb(self.settings.to_color),
+			}
+		end,
 		update_fn = function(self, progress, ease)
-			local initial = utils.hex_to_rgb(self.settings.from_color)
-			local final = utils.hex_to_rgb(self.settings.to_color)
+			local initial = self.starter.initial
+			local final = self.starter.final
 
 			local fn = easing_functions[ease]
 
@@ -41,11 +53,16 @@ return {
 		end,
 	}),
 	bounce = create_effect({
+		builder = function(self)
+			return {
+				initial = utils.hex_to_rgb(self.settings.from_color),
+				final = utils.hex_to_rgb(self.settings.to_color),
+			}
+		end,
 		update_fn = function(self, progress)
 			local oscillation = math.abs(math.sin(progress * math.pi * self.settings.oscillation_count))
-
-			local initial = utils.hex_to_rgb(self.settings.from_color)
-			local final = utils.hex_to_rgb(self.settings.to_color)
+			local initial = self.starter.initial
+			local final = self.starter.final
 
 			local current = {
 				r = math.max(initial.r + (final.r - initial.r) * oscillation, 0),
@@ -57,9 +74,15 @@ return {
 		end,
 	}),
 	left_to_right = create_effect({
+		builder = function(self)
+			return {
+				initial = utils.hex_to_rgb(self.settings.from_color),
+				final = utils.hex_to_rgb(self.settings.to_color),
+			}
+		end,
 		update_fn = function(self, progress)
-			local initial = utils.hex_to_rgb(self.settings.from_color)
-			local final = utils.hex_to_rgb(self.settings.to_color)
+			local initial = self.starter.initial
+			local final = self.starter.final
 
 			local current = {
 				r = initial.r + (final.r - initial.r) * math.min(self.settings.min_progress, progress),
@@ -71,9 +94,15 @@ return {
 		end,
 	}),
 	pulse = create_effect({
+		builder = function(self)
+			return {
+				initial = utils.hex_to_rgb(self.settings.from_color),
+				final = utils.hex_to_rgb(self.settings.to_color),
+			}
+		end,
 		update_fn = function(self, progress)
-			local initial = utils.hex_to_rgb(self.settings.from_color)
-			local final = utils.hex_to_rgb(self.settings.to_color)
+			local initial = self.starter.initial
+			local final = self.starter.final
 
 			local pulse = math.abs(math.sin(progress * math.pi * self.settings.pulse_count))
 			pulse = pulse * self.settings.intensity