yellow alpha

src/core/Printer.lua

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+-- Game Boy Printer stand-in.  Yellow's printer jobs
+-- (engine/printer/printer.asm: PrintPokedexEntry and friends) drove a
+-- serial thermal printer; this port renders the same printout into a PNG
+-- under prints/ in the save directory instead, and the caller shows a
+-- dialog with where it landed.  Scaled up 4x so the "print" is legible
+-- on a modern screen.
+
+local Logger = require("src.core.Logger")
+
+local Printer = {}
+
+local SCALE = 4
+
+-- Render drawFn (which draws a w x h GB-pixel image at 0,0) into
+-- prints/<name>_<stamp>.png.  Returns the save-dir-relative path, or nil
+-- and an error string (headless / no canvas support degrades gracefully).
+function Printer.save(name, w, h, drawFn)
+  if not (love.graphics and love.graphics.newCanvas) then
+    return nil, "no graphics"
+  end
+  local ok, canvas = pcall(love.graphics.newCanvas, w * SCALE, h * SCALE)
+  if not ok then return nil, tostring(canvas) end
+  love.graphics.push("all")
+  love.graphics.setCanvas(canvas)
+  love.graphics.origin()
+  love.graphics.scale(SCALE, SCALE)
+  love.graphics.clear(1, 1, 1, 1)
+  love.graphics.setColor(1, 1, 1, 1)
+  local drawOk, drawErr = pcall(drawFn)
+  love.graphics.pop()
+  if not drawOk then return nil, tostring(drawErr) end
+  local data
+  ok, data = pcall(canvas.newImageData, canvas)
+  if not ok then return nil, tostring(data) end
+  love.filesystem.createDirectory("prints")
+  local path = ("prints/%s_%s.png"):format(name, os.date("%Y-%m-%d_%H%M%S"))
+  local encOk, err = pcall(data.encode, data, "png", path)
+  if not encOk then return nil, tostring(err) end
+  Logger.info("printed %s -> %s/%s",
+    name, love.filesystem.getSaveDirectory(), path)
+  return path
+end
+
+return Printer