shamona

docs/new-features.md

@@ -11,7 +11,7 @@ Features intentionally added beyond the original Pokémon Red, Blue, and Yellow
 * **Persistent custom options** stored separately from game saves
 * **Optional widescreen battle layout**
 * **Mobile touch controls** with editable layouts, vibration, and orientation settings
-* **Touch skins** in RetroArch overlay format, with bezel art, per-button press states, and Super Game Boy borders
+* **Touch skins** in RetroArch overlay format and Delta `.deltaskin` (including PDF-wrapped bezel art), with per-button press states and Super Game Boy borders
 * **Pokédex diploma and printer image exports**
 
 ## Gen 2 Specifics

docs/skin-studio.md

@@ -95,18 +95,22 @@ auto-rotates like a RetroArch one. Item `frame` rects are top-left plus size in
 `extendedEdges` merge per key into the reach fields; `mask: "circle"` becomes a
 radial hitbox. A `dpad` or `thumbstick` item expands into the 3x3 grid, so the
 corners fire two directions. `screens[1].outputFrame` (or the legacy
-`gameScreenFrame`) becomes the screen cutout, and the skin stretches to the
-window the way Delta does rather than letterboxing. Host functions map to
+`gameScreenFrame`) becomes the screen cutout. A portrait page with neither
+keeps `mappingSize` as the overlay aspect, sits at the bottom of the
+window, and puts the Game Boy picture in the leftover space above -- the
+usual GBA4iOS controller-deck layout. Pages that name a screen rect still
+stretch to the window the way Delta does. Host functions map to
 engine hotkeys: `menu` to `menu_toggle`, `fastForward` to
 `hold_fast_forward`, `toggleFastForward` to `toggle_fast_forward`;
 `quickSave` and `quickLoad` have nothing to bind to and drop to decoration.
 Both `com.rileytestut.delta.game.*` and Manic's `public.aoshuang.game.*`
 identifiers are accepted, and a non Game Boy system warns instead of failing.
 
-PDF artwork is the one thing that does not come across: Delta's own templates
-are all-PDF and this engine has no rasterizer, so such a skin is refused with
-the message asking for a PNG version. GBA4iOS `.gbcskin` / `.gbaskin` files are
-an older, incompatible schema and are refused by name.
+PDF artwork is usually a JPEG wrapped so iOS can scale it (Delta's
+Image-to-PDF skins, Preview exports, and the like). Import extracts that
+JPEG and draws it; a true vector PDF with no embedded image is still refused,
+with a message asking for a PNG version. GBA4iOS `.gbcskin` / `.gbaskin` files
+are an older, incompatible schema and are refused by name.
 
 ## Bindable actions
 
@@ -268,6 +272,7 @@ exported file** opens that folder.
 
 ## Not implemented
 
-Delta skins whose art is PDF only. Rasterizing them needs a PDF renderer this
-engine does not carry, so they are refused with a message rather than imported
-half-drawn.
+True vector Delta skins (PDF artwork with no embedded JPEG). Those still need
+a PDF renderer this engine does not carry, so they are refused with a message
+rather than imported half-drawn. PDF files that wrap a JPEG, the usual Delta
+skin case, extract on import.

src/core/DeltaSkin.lua

@@ -116,11 +116,13 @@ function DeltaSkin.pickAsset(assets, opts, pdfFiles)
   if type(assets) ~= "table" then return nil end
   pdfFiles = pdfFiles or {}
   local raster = {}
+  local pdfName
   for _, key in ipairs(DeltaSkin.ASSET_LADDER) do
     local name = pick(assets, key)
     if key == "medium" and type(name) ~= "string" then name = pick(assets, "normal") end
     if type(name) == "string" and name ~= "" then
       if name:lower():match("%.pdf$") then
+        pdfName = name
         pdfFiles[#pdfFiles + 1] = name
       else
         raster[#raster + 1] = { key = key, name = name }
@@ -130,12 +132,14 @@ function DeltaSkin.pickAsset(assets, opts, pdfFiles)
   local resizable = pick(assets, "resizable")
   if type(resizable) == "string" and resizable ~= "" then
     if resizable:lower():match("%.pdf$") then
+      pdfName = resizable
       pdfFiles[#pdfFiles + 1] = resizable
     else
       raster[#raster + 1] = { key = "large", name = resizable }
     end
   end
-  if #raster == 0 then return nil end
+  local pdfPath = pdfName and DeltaSkin.resolveName(pdfName, opts) or nil
+  if #raster == 0 then return nil, pdfPath end
 
   local target = numOr(opts and opts.targetWidth, DeltaSkin.DEFAULT_TARGET_WIDTH)
   local chosen
@@ -145,7 +149,7 @@ function DeltaSkin.pickAsset(assets, opts, pdfFiles)
     end
   end
   if not chosen then chosen = raster[#raster].name end
-  return DeltaSkin.resolveName(chosen, opts)
+  return DeltaSkin.resolveName(chosen, opts), nil
 end
 
 function DeltaSkin.mergeEdges(base, item)
@@ -288,10 +292,12 @@ function DeltaSkin.buildPage(obj, orient, opts, warnings, pdfFiles)
     addWarning(warnings, orient .. " has no mappingSize; assuming 320x240")
   end
 
+  local imagePath, pdfPath = DeltaSkin.pickAsset(pick(obj, "assets"), opts, pdfFiles)
   local page = {
     name = orient,
     orient = orient,
-    imagePath = DeltaSkin.pickAsset(pick(obj, "assets"), opts, pdfFiles),
+    imagePath = imagePath,
+    pdfPath = pdfPath,
     fullScreen = true,
     normalized = true,
     pixelCoords = false,
@@ -309,6 +315,14 @@ function DeltaSkin.buildPage(obj, orient, opts, warnings, pdfFiles)
   if screen then
     page.viewport = screen
     page.viewportFill = false
+  else
+    -- mappingSize is the overlay, not the device.  Portrait controller
+    -- skins (GBA4iOS-era 320x240 decks, this Pikachu skin, etc.) keep
+    -- that aspect, sit at the bottom, and leave the leftover for the
+    -- Game Boy picture.  A screens/gameScreenFrame rect still fills.
+    page.aspectFromCfg = true
+    page.screenFit = "remainder"
+    if orient == "portrait" then page.anchor = "bottom" end
   end
 
   local baseEdges = pick(obj, "extendedEdges")
@@ -368,9 +382,6 @@ function DeltaSkin.parse(text, opts)
     end
   end
   if #pages == 0 then return nil, "info.json has no usable representation" end
-  if #pdfFiles > 0 then
-    addWarning(warnings, "PDF artwork cannot be imported yet")
-  end
 
   return {
     pages = pages,
@@ -390,6 +401,10 @@ function DeltaSkin.needsConversion(skin)
   local files = skin.pdfFiles
   if type(files) ~= "table" or #files == 0 then return nil end
   for _, page in ipairs(skin.pages or {}) do
+    -- A raster asset, or a JPEG recovered from the PDF at load, means the
+    -- skin can draw.  Parse-only callers still see pdfOnly because they
+    -- have not run extract yet.
+    if page.rasterData then return nil end
     if page.imagePath then return nil end
   end
   return { pdfOnly = true, files = files }

src/core/PdfImage.lua

@@ -0,0 +1,115 @@
+-- Recover a raster from a PDF that is really a wrapped JPEG.  Delta skins
+-- ship artwork that way so iOS can scale it; LOVE has no PDF renderer, so
+-- import pulls the embedded image out instead of refusing the skin.  True
+-- vector PDFs (no Image XObject, no JPEG) still fail.
+
+local PdfImage = {}
+
+local function isPdf(bytes)
+  return type(bytes) == "string" and bytes:sub(1, 5) == "%PDF-"
+end
+
+-- After the `stream` keyword the spec allows \n or \r\n before the bytes.
+-- `endstream` also contains the letters "stream", so skip that match.
+local function streamDataStart(bytes, from)
+  local s, e = bytes:find("stream", from, true)
+  while s do
+    if s == 1 or bytes:sub(s - 3, s - 1) ~= "end" then
+      local p = e + 1
+      if bytes:sub(p, p) == "\r" then p = p + 1 end
+      if bytes:sub(p, p) == "\n" then p = p + 1 end
+      return p, s
+    end
+    s, e = bytes:find("stream", e + 1, true)
+  end
+  return nil
+end
+
+local function dictWindow(bytes, imageAt)
+  local from = imageAt > 400 and (imageAt - 400) or 1
+  local to = math.min(#bytes, imageAt + 800)
+  return bytes:sub(from, to)
+end
+
+local function dictNumber(window, key)
+  -- Prefer an indirect ref so `/Length 5 0 R` is not read as length 5.
+  if window:find("/" .. key .. "%s+%d+%s+%d+%s+R") then return nil end
+  return tonumber(window:match("/" .. key .. "%s+(%d+)"))
+end
+
+local function dictFilter(window)
+  local named = window:match("/Filter%s*/(%w+)")
+  if named then return named end
+  return window:match("/Filter%s*%[%s*/(%w+)")
+end
+
+local function jpegIn(bytes, from, to)
+  if from < 1 then from = 1 end
+  if not to or to > #bytes then to = #bytes end
+  if to < from then return nil end
+  local region = bytes:sub(from, to)
+  local soi = region:find("\255\216\255", 1, true)
+  if not soi then return nil end
+  local eoi = region:find("\255\217", soi + 3, true)
+  if not eoi then return nil end
+  return region:sub(soi, eoi + 1)
+end
+
+local function candidate(data, width, height, ext)
+  if not data or data == "" then return nil end
+  return {
+    data = data,
+    ext = ext or "jpg",
+    width = width or 0,
+    height = height or 0,
+  }
+end
+
+local function bigger(a, b)
+  if not a then return b end
+  if not b then return a end
+  local as = (a.width or 0) * (a.height or 0)
+  local bs = (b.width or 0) * (b.height or 0)
+  if bs ~= as then return bs > as and b or a end
+  return #b.data > #a.data and b or a
+end
+
+-- Walk Image XObjects and take the largest DCTDecode (JPEG) stream.
+local function fromImageXObjects(bytes)
+  local best
+  local i = 1
+  while true do
+    local s, e = bytes:find("/Subtype%s*/Image", i)
+    if not s then break end
+    local window = dictWindow(bytes, s)
+    local filter = dictFilter(window)
+    local width = dictNumber(window, "Width")
+    local height = dictNumber(window, "Height")
+    local dataStart = streamDataStart(bytes, e)
+    i = e + 1
+    if dataStart and filter == "DCTDecode" then
+      local es = bytes:find("endstream", dataStart, true)
+      local jpeg = jpegIn(bytes, dataStart, es and (es - 1) or nil)
+      best = bigger(best, candidate(jpeg, width, height, "jpg"))
+    end
+  end
+  return best
+end
+
+-- Image-to-PDF converters (3-Heights, Preview, etc.) leave a single JPEG
+-- body even when /Length is an indirect object we do not resolve.
+local function fromBareJpeg(bytes)
+  local jpeg = jpegIn(bytes, 1, #bytes)
+  if not jpeg then return nil end
+  return candidate(jpeg, 0, 0, "jpg")
+end
+
+function PdfImage.extract(bytes)
+  if not isPdf(bytes) then return nil, "not a pdf" end
+  local best = fromImageXObjects(bytes)
+  if not best then best = fromBareJpeg(bytes) end
+  if not best then return nil, "no extractable image" end
+  return best
+end
+
+return PdfImage

src/core/TouchSkin.lua

@@ -432,6 +432,10 @@ function TouchSkin.parseNative(text)
       aspectFromCfg = raw.fitAspect == true,
       orient = (raw.orient == "portrait" or raw.orient == "landscape"
                 or raw.orient == "any") and raw.orient or nil,
+      screenFit = raw.screenFit == "remainder" and "remainder" or nil,
+      anchor = (raw.anchor == "top" or raw.anchor == "bottom"
+                or raw.anchor == "left" or raw.anchor == "right")
+                and raw.anchor or nil,
       rect = { x = 0, y = 0, w = 1, h = 1 },
       controls = {},
     }
@@ -507,6 +511,8 @@ function TouchSkin.toNative(skin)
       alphaMod = page.alphaMod,
       aspect = page.aspect,
       fitAspect = page.aspectFromCfg or nil,
+      screenFit = page.screenFit == "remainder" and "remainder" or nil,
+      anchor = page.anchor,
       orient = (page.orient == "portrait" or page.orient == "landscape"
                 or page.orient == "any") and page.orient or nil,
       controls = {},
@@ -570,6 +576,40 @@ local function loadImage(path)
   return img
 end
 
+-- FileData so LOVE sniffs JPEG/PNG from the name, not a path inside the zip.
+local function loadImageFromBytes(bytes, name)
+  if not bytes or bytes == "" then return nil end
+  if not (love and love.graphics and love.graphics.newImage) then return nil end
+  if not (love.filesystem and love.filesystem.newFileData) then return nil end
+  local key = "bytes:" .. tostring(name) .. ":" .. tostring(#bytes)
+  local cached = imageCache[key]
+  if cached then return cached end
+  local okFd, fd = pcall(love.filesystem.newFileData, bytes, name or "bezel.jpg")
+  if not okFd or not fd then return nil end
+  local ok, img = pcall(love.graphics.newImage, fd)
+  if not ok or not img then
+    if love.image and love.image.newImageData then
+      local okData, data = pcall(love.image.newImageData, fd)
+      if okData and data then ok, img = pcall(love.graphics.newImage, data) end
+    end
+  end
+  if not ok or not img then return nil end
+  if img.setFilter then img:setFilter("linear", "linear") end
+  imageCache[key] = img
+  return img
+end
+
+local function rasterizePdfPage(page, root)
+  if not page or page.image or not page.pdfPath then return end
+  local pdf = readFile(joinPath(root, page.pdfPath))
+  local raster = require("src.core.PdfImage").extract(pdf)
+  if not raster then return end
+  local name = tostring(page.pdfPath):gsub("%.[Pp][Dd][Ff]$", "") .. "." .. raster.ext
+  page.rasterData = raster.data
+  page.rasterName = name:match("([^/]+)$") or name
+  page.image = loadImageFromBytes(raster.data, page.rasterName)
+end
+
 local function pixelScalePending(page)
   if page.pixelCoords then return true end
   for _, ctl in ipairs(page.controls or {}) do
@@ -622,6 +662,8 @@ function TouchSkin.load(root, id)
   for _, page in ipairs(skin.pages) do
     if page.imagePath then
       page.image = loadImage(joinPath(root, page.imagePath))
+    elseif page.pdfPath then
+      rasterizePdfPage(page, root)
     end
     if not applyPixelScale(page) then
       return nil, "could not read " .. tostring(page.imagePath)
@@ -646,7 +688,7 @@ end
 TouchSkin.ARCHIVE_EXTS = { zip = true, deltaskin = true }
 TouchSkin.LEGACY_EXTS = { gbcskin = true, gbaskin = true, gbskin = true }
 TouchSkin.PDF_ONLY_MESSAGE =
-  "This skin uses PDF artwork, which cannot be imported yet. "
+  "This skin uses PDF artwork with no extractable image. "
   .. "Ask the author for a PNG version."
 
 function TouchSkin.archiveId(name)
@@ -1246,12 +1288,27 @@ function TouchSkin.pageBox(page, w, h, ox, oy)
     and page.aspect and page.aspect > 0 and h > 0
   if fit then
     local displayAspect = w / h
+    local anchor = page.anchor
     if displayAspect > page.aspect then
       bw = h * page.aspect
-      bx = ox + (w - bw) * 0.5
+      local extra = w - bw
+      if anchor == "right" then
+        bx = ox + extra
+      elseif anchor == "left" then
+        bx = ox
+      else
+        bx = ox + extra * 0.5
+      end
     else
       bh = w / page.aspect
-      by = oy + (h - bh) * 0.5
+      local extra = h - bh
+      if anchor == "bottom" then
+        by = oy + extra
+      elseif anchor == "top" then
+        by = oy
+      else
+        by = oy + extra * 0.5
+      end
     end
   end
   local r = page.rect
@@ -1308,18 +1365,55 @@ end
 
 function TouchSkin.hasViewport()
   local page = TouchSkin.page()
-  return page ~= nil and page.viewport ~= nil and TouchSkin.drawable()
+  if not page or not TouchSkin.drawable() then return false end
+  return page.viewport ~= nil or page.screenFit == "remainder"
+end
+
+-- Largest strip of (ox,oy,w,h) that does not overlap the overlay box.
+local function remainderBox(ox, oy, w, h, bx, by, bw, bh)
+  local right, bottom = ox + w, oy + h
+  local cand = {
+    { ox, oy, w, by - oy },
+    { ox, by + bh, w, bottom - (by + bh) },
+    { ox, oy, bx - ox, h },
+    { bx + bw, oy, right - (bx + bw), h },
+  }
+  local best, bestArea
+  for _, r in ipairs(cand) do
+    if r[3] > 1 and r[4] > 1 then
+      local area = r[3] * r[4]
+      if not best or area > bestArea then
+        best, bestArea = r, area
+      end
+    end
+  end
+  if not best then return nil end
+  return best[1], best[2], best[3], best[4]
+end
+
+function TouchSkin.pageViewport(page, w, h, ox, oy)
+  if not page then return nil end
+  ox, oy = ox or 0, oy or 0
+  local bx, by, bw, bh = TouchSkin.pageBox(page, w, h, ox, oy)
+  if page.viewport then
+    local v = page.viewport
+    local x, y = bx + v.x * bw, by + v.y * bh
+    local vw, vh = v.w * bw, v.h * bh
+    if vw <= 0 or vh <= 0 then return nil end
+    return x, y, vw, vh, page.viewportFill == true, page.viewportExpand == true
+  end
+  if page.screenFit == "remainder" then
+    local x, y, vw, vh = remainderBox(ox, oy, w, h, bx, by, bw, bh)
+    if not x then return nil end
+    return x, y, vw, vh, false, false
+  end
+  return nil
 end
 
 function TouchSkin.viewport(w, h, ox, oy)
   local page = TouchSkin.page()
-  if not page or not page.viewport or not TouchSkin.drawable() then return nil end
-  local v = page.viewport
-  local bx, by, bw, bh = TouchSkin.pageBox(page, w, h, ox, oy)
-  local x, y = bx + v.x * bw, by + v.y * bh
-  local vw, vh = v.w * bw, v.h * bh
-  if vw <= 0 or vh <= 0 then return nil end
-  return x, y, vw, vh, page.viewportFill == true, page.viewportExpand == true
+  if not page or not TouchSkin.drawable() then return nil end
+  return TouchSkin.pageViewport(page, w, h, ox, oy)
 end
 
 return TouchSkin

src/import/RomImporter.lua

@@ -3119,7 +3119,8 @@ function RomImporter:_ensureSkins(force)
       format = skin and skin.format or nil,
       pages = skin and #skin.pages or 0,
       controls = controls,
-      screen = page ~= nil and page.viewport ~= nil,
+      screen = page ~= nil
+        and (page.viewport ~= nil or page.screenFit == "remainder"),
       ok = skin ~= nil,
     }
   end

src/ui/SkinStudio.lua

@@ -851,6 +851,7 @@ function Studio.detectViewport()
   end
   Studio.pushUndo()
   page.viewport = rect
+  page.screenFit = nil
   setStatus(("Screen detected: %dx%d px in the bezel art"):format(pw, ph))
   Studio.dirty = true
 end
@@ -860,8 +861,9 @@ function Studio.toggleViewport()
   if not page then return end
   if Studio.canvas().lockViewport then return end
   Studio.pushUndo()
-  if page.viewport then
+  if page.viewport or page.screenFit == "remainder" then
     page.viewport = nil
+    page.screenFit = nil
   else
     page.viewport = { x = 0.1, y = 0.05, w = 0.8, h = 0.45 }
   end
@@ -892,7 +894,7 @@ function Studio.pageLabel(index)
   local orient = TouchSkin.pageOrient(page)
   local bits = { #(page.controls or {}) .. " controls" }
   if orient then bits[#bits + 1] = orient end
-  if page.viewport then bits[#bits + 1] = "screen" end
+  if page.viewport or page.screenFit == "remainder" then bits[#bits + 1] = "screen" end
   return name, table.concat(bits, "  \194\183  ")
 end
 
@@ -1092,10 +1094,9 @@ function Studio.snapLines(page, r, skipIndex)
 end
 
 local function viewportRect(page, r)
-  local v = page.viewport
-  if not v then return nil end
-  local bx, by, bw, bh = TouchSkin.pageBox(page, r.w, r.h, r.x, r.y)
-  return bx + v.x * bw, by + v.y * bh, v.w * bw, v.h * bh
+  local x, y, w, h = TouchSkin.pageViewport(page, r.w, r.h, r.x, r.y)
+  if not x then return nil end
+  return x, y, w, h
 end
 
 local function handleRects(bx, by, bw, bh)
@@ -1138,7 +1139,7 @@ function Studio.beginCanvasDrag(mx, my, r)
   end
 
   local vx, vy, vw, vh = viewportRect(page, r)
-  if vx and not Studio.canvas().lockViewport then
+  if vx and not Studio.canvas().lockViewport and page.screenFit ~= "remainder" then
     for _, h in ipairs(handleRects(vx, vy, vw, vh)) do
       if mx >= h.x and mx <= h.x + h.w and my >= h.y and my <= h.y + h.h then
         Studio.pushUndo()
@@ -1162,7 +1163,7 @@ function Studio.beginCanvasDrag(mx, my, r)
     end
   end
 
-  if vx and not Studio.canvas().lockViewport
+  if vx and not Studio.canvas().lockViewport and page.screenFit ~= "remainder"
      and mx >= vx and mx <= vx + vw and my >= vy and my <= vy + vh then
     Studio.selected = nil
     Studio.pushUndo()
@@ -1270,7 +1271,7 @@ local function drawCanvas(x, y, w, h)
   if vx then
     Theme.strokeRounded(vx, vy, vw, vh, PAL.blue, 0.9, 2, 2)
     Kit.text("small", "SCREEN", vx + 4 * Kit.scale, vy + 4 * Kit.scale, PAL.blue)
-    if not Studio.canvas().lockViewport then
+    if not Studio.canvas().lockViewport and page.screenFit ~= "remainder" then
       local a = Studio.selectedControl() and 0.45 or 1
       for _, hd in ipairs(handleRects(vx, vy, vw, vh)) do
         Theme.fill(hd.x, hd.y, hd.w, hd.h, PAL.blue, a)
@@ -1374,7 +1375,7 @@ local function inspectorBody(x, y, w)
   cy = cy + rowH + gap
 
   if page then
-    local bezel = page.imagePath or "(none)"
+    local bezel = page.imagePath or page.rasterName or "(none)"
     local pickW = 82 * Kit.scale
     local cycleW = w - pickW - gap
     if Kit.button(x, cy, cycleW, rowH, "Bezel: " .. bezel, { id = "bezel" }) then
@@ -1385,7 +1386,8 @@ local function inspectorBody(x, y, w)
       Studio.importImageFile("bezel")
     end
     cy = cy + rowH + gap
-    local vpLabel = page.viewport and "Screen cutout: ON" or "Screen cutout: OFF"
+    local vpLabel = (page.viewport or page.screenFit == "remainder")
+      and "Screen cutout: ON" or "Screen cutout: OFF"
     if Kit.button(x, cy, half, rowH, vpLabel, { id = "vp",
         enabled = not Studio.canvas().lockViewport }) then
       Studio.toggleViewport()

tests/engine/skin_format_import_test.lua

@@ -364,6 +364,31 @@ eq(bx, 0, "delta page box x") eq(by, 0, "delta page box y")
 eq(bw, 1000, "delta page box fills the width")
 eq(bh, 500, "delta page box fills the height")
 
+local DECK_JSON = [[
+{ "name": "Deck", "gameTypeIdentifier": "com.rileytestut.delta.game.gbc",
+  "representations": { "iphone": { "standard": { "portrait": {
+    "assets": { "large": "deck.png" },
+    "mappingSize": {"width":320,"height":240},
+    "items": [ { "inputs": ["a"], "frame": {"x":240,"y":60,"width":64,"height":64} } ]
+  } } } } }
+]]
+local deck = assert(DeltaSkin.parse(DECK_JSON))
+local deckPage = deck.pages[1]
+check(deckPage.aspectFromCfg, "a portrait deck without screens keeps mapping aspect")
+eq(deckPage.anchor, "bottom", "and sits at the bottom of the window")
+eq(deckPage.screenFit, "remainder", "with the leftover given to the GB picture")
+eq(deckPage.viewport, nil, "no screens[] means no baked cutout")
+local dbx, dby, dbw, dbh = TouchSkin.pageBox(deckPage, 1080, 1920)
+eq(dbx, 0, "deck overlay is full width")
+eq(dbw, 1080, "deck overlay width")
+near(dbh, 1080 * 240 / 320, "deck overlay height is mapping aspect")
+near(dby, 1920 - dbh, "pinned to the bottom, not stretched")
+local vx, vy, vw, vh = TouchSkin.pageViewport(deckPage, 1080, 1920)
+eq(vx, 0, "screen leftover x") eq(vy, 0, "screen leftover y")
+eq(vw, 1080, "screen leftover is full width")
+near(vh, dby, "and fills everything above the overlay")
+check(vh > dbh, "there is more room for the picture than for the pad")
+
 local LEGACY_SCREEN = [[
 { "gameTypeIdentifier": "public.aoshuang.game.gbc",
   "representations": { "iphone": { "standard": { "landscape": {
@@ -419,6 +444,8 @@ local PDF_JSON = [[
 ]]
 local pdf = assert(DeltaSkin.parse(PDF_JSON))
 eq(pdf.pages[1].imagePath, nil, "a PDF asset is not pretended to be art")
+eq(pdf.pages[1].pdfPath, "iphone_portrait.pdf",
+   "but the PDF path is kept so load can extract a JPEG from it")
 local convert = DeltaSkin.needsConversion(pdf)
 check(convert ~= nil, "PDF-only skins report that they need conversion")
 if convert then
@@ -471,6 +498,55 @@ check(tostring(vectorErr):find("PDF artwork", 1, true) ~= nil,
 eq(love.filesystem.read("skins/vector.deltaskin"), nil,
    "and the refused archive is not left behind")
 
+local PdfImage = require("src.core.PdfImage")
+local function unhex(s)
+  return (s:gsub("..", function(cc)
+    return string.char(tonumber(cc, 16))
+  end))
+end
+-- 1x1 JFIF JPEG, so extract tests do not need a file on disk.
+local TINY_JPEG = unhex(
+  "ffd8ffe000104a46494600010100000100010000ffdb0043000806060706050807070709" ..
+  "09080a0c140d0c0b0b0c1912130f141d1a1f1e1d1a1c1c20242e2720222c231c1c283729" ..
+  "2c30313434341f27393d38323c2e333432ffc0000b080001000101011100ffc400140001" ..
+  "0000000000000000000000000000000008ffc40014100100000000000000000000000000" ..
+  "00000000ffda0008010100003f007f3fffd9")
+local function jpegPdf(jpeg, w, h)
+  return "%PDF-1.7\n3 0 obj\n<< /Type /XObject /Subtype /Image /Width "
+    .. tostring(w) .. " /Height " .. tostring(h)
+    .. " /BitsPerComponent 8 /ColorSpace /DeviceRGB /Filter /DCTDecode /Length "
+    .. tostring(#jpeg) .. " >>\nstream\n" .. jpeg .. "\nendstream\nendobj\n%%EOF\n"
+end
+local extracted = assert(PdfImage.extract(jpegPdf(TINY_JPEG, 1, 1)))
+eq(extracted.ext, "jpg", "a JPEG-in-PDF yields a jpg")
+eq(extracted.data, TINY_JPEG, "and the JPEG body is recovered byte for byte")
+eq(extracted.width, 1, "width comes from the Image XObject")
+eq(extracted.height, 1, "and so does height")
+
+local indirect = "%PDF-1.7\n3 0 obj\n<< /Type /XObject /Subtype /Image /Width 1"
+  .. " /Height 1 /Filter /DCTDecode /Length 5 0 R >>\nstream\n" .. TINY_JPEG
+  .. "\nendstream\nendobj\n5 0 obj\n" .. tostring(#TINY_JPEG) .. "\nendobj\n%%EOF\n"
+local fromRef = assert(PdfImage.extract(indirect))
+eq(fromRef.data, TINY_JPEG,
+   "an indirect /Length (the 3-Heights Image-to-PDF layout) still extracts")
+
+eq(select(1, PdfImage.extract("%PDF-1.7\n1 0 obj\n<< /Type /Catalog >>\nendobj\n")),
+   nil, "a vector PDF with no image is not pretended to be art")
+eq(select(1, PdfImage.extract("not a pdf")), nil, "and neither is garbage")
+
+love.filesystem.write("skins/pikapdf.deltaskin/info.json", PDF_JSON)
+love.filesystem.write("skins/pikapdf.deltaskin/iphone_portrait.pdf",
+                      jpegPdf(TINY_JPEG, 1, 1))
+local pikaId, pikaErr = TouchSkin.installArchive("pikapdf.deltaskin", "PK\3\4stub")
+eq(pikaId, "pikapdf", "a Delta skin whose PDF wraps a JPEG installs: "
+  .. tostring(pikaErr))
+local pika = assert(TouchSkin.load("skins/_mounted/pikapdf", "pikapdf"))
+check(pika.pages[1].rasterData == TINY_JPEG,
+      "load recovers the JPEG from the PDF")
+check(pika.pages[1].image ~= nil, "and LOVE gets an image from those bytes")
+eq(DeltaSkin.needsConversion(pika), nil,
+   "so the skin no longer reports that it needs conversion")
+
 eq(select(1, TouchSkin.installArchive("skin.gbcskin", "PK\3\4stub")), nil,
    "a GBA4iOS .gbcskin is refused at the door")
 local _, legacyErr = TouchSkin.installArchive("skin.gbaskin", "PK\3\4stub")