big palette energy

tests/engine/gen2_battle_anim_view_fill_palette_test.lua

@@ -0,0 +1,52 @@
+-- BattleAnimView:fillBackground() used to draw a flat literal white
+-- rectangle with no GbcPalette involvement, leaving a stark white gap
+-- during the battle intro's slide-in under a custom COLORS ramp.
+--
+-- No real shader runs headless, so this asserts on which seam gets called
+-- rather than on rendered pixels, same as every palette-seam test here.
+package.path = "./?.lua;./?/init.lua;" .. package.path
+
+local T = require("tests.harness")
+
+love = require("tests.love_stub")
+
+require("src.core.Logger").warn = function() end
+
+local GbcPalette = require("src.render.GbcPalette")
+local BattleAnimView = require("src.ui.gen2.BattleAnimView")
+
+local calls
+local function spy(name)
+  local original = GbcPalette[name]
+  GbcPalette[name] = function(...)
+    calls[name] = (calls[name] or 0) + 1
+    return original(...)
+  end
+end
+
+do
+  GbcPalette.available = function() return true end
+  GbcPalette.setCustomRamp({ { 255, 0, 255 }, { 200, 0, 200 }, { 100, 0, 100 },
+                              { 0, 0, 0 } })
+  calls = {}
+  spy("resolve"); spy("use"); spy("with")
+  local view = BattleAnimView.new({}, {})
+  view:fillBackground()
+  T.check((calls.resolve or 0) > 0 or (calls.use or 0) > 0 or (calls.with or 0) > 0,
+    "BattleAnimView:fillBackground() reaches the GbcPalette seam")
+end
+
+-- Unthemed / no-shader boot must still degrade to the plain literal white
+-- fill, byte-identical to before this fix.
+do
+  GbcPalette.available = function() return false end
+  calls = {}
+  spy("resolve"); spy("use"); spy("with")
+  local view = BattleAnimView.new({}, {})
+  local ok = pcall(function() view:fillBackground() end)
+  T.check(ok, "BattleAnimView:fillBackground() does not error with no shader")
+  T.eq((calls.resolve or 0) + (calls.use or 0) + (calls.with or 0), 0,
+    "BattleAnimView:fillBackground() does not touch GbcPalette with no shader")
+end
+
+T.finish()