CLOSES #1231, CLOSES #1269, CLOSES #1301

tests/engine/gen2_map_bake_dpi.lua

@@ -0,0 +1,54 @@
+-- Gen 2 map bakes take dpiscale 1 so map pixels stay square LCD pixels
+-- (#208 #1301, constants/hardware.inc:932; see src/render/PixelCanvas.lua).
+package.path = "./?.lua;./?/init.lua;" .. package.path
+
+local T = require("tests.modkit")
+
+local g = love.graphics
+local seen = {}
+local realNewCanvas = g.newCanvas
+g.newCanvas = function(w, h, settings)
+  seen[#seen + 1] = { w = w, h = h, dpiscale = settings and settings.dpiscale }
+  local c = realNewCanvas(w, h)
+  c.renderTo = function(_, fn) fn() end
+  c.setFilter = function() end
+  return c
+end
+
+local World = require("src.world.gen2.World")
+local MapPreview = require("src.world.gen2.MapPreview")
+
+local atlas = {
+  getDimensions = function() return 128, 128 end,
+  setFilter = function() end,
+}
+local tileset = { blocks = { [1] = {} }, tilesPerRow = 16 }
+local map = { def = { tileset = "TILESET_JOHTO" }, width = 20, height = 18,
+              blocks = {}, borderBlock = 0 }
+
+local world = setmetatable({
+  atlasCache = {},
+  atlasFor = function() return atlas, tileset end,
+}, { __index = World })
+
+World.bakeMapImage(world, map, nil, nil)
+local bakeCount = #seen
+T.check(bakeCount >= 1, "the map bake allocated a canvas")
+
+World.scrollStrip(world, map.def, tileset, 3, { h = 1, v = 0 })
+T.check(#seen > bakeCount, "the scroll strip allocated a canvas")
+local stripCount = #seen
+
+local origAtlasFor = MapPreview.atlasFor
+MapPreview.atlasFor = function() return atlas, tileset end
+MapPreview.bake({ tilesets = {}, atlasCache = {}, mapImages = {} }, map, "DAY")
+MapPreview.atlasFor = origAtlasFor
+T.check(#seen > stripCount, "the save-editor bake allocated a canvas")
+
+for i, c in ipairs(seen) do
+  T.eq(c.dpiscale, 1,
+    ("canvas %d (%dx%d) is allocated at dpiscale 1"):format(i, c.w, c.h))
+end
+
+g.newCanvas = realNewCanvas
+T.finish("gen2 map bake dpi")