move duplicate codes to document.lua

frontend/document/djvudocument.lua

@@ -20,126 +20,13 @@ function DjvuDocument:init()
 	self:_readMetadata()
 end
 
-function DjvuDocument:_readMetadata()
-	self.info.number_of_pages = self._document:getPages()
-	return true
-end
-
-function DjvuDocument:close()
-	if self.is_open then
-		self.is_open = false
-		self._document:close()
-	end
-end
-
-function DjvuDocument:getNativePageDimensions(pageno)
-	local hash = "pgdim|"..self.file.."|"..pageno
-	local cached = Cache:check(hash)
-	if cached then
-		return cached[1]
-	end
-	local page = self._document:openPage(pageno)
-	local page_size_w, page_size_h = page:getSize(self.dc_null)
-	local page_size = Geom:new{ w = page_size_w, h = page_size_h }
-	Cache:insert(hash, CacheItem:new{ page_size })
-	page:close()
-	return page_size
-end
-
 function DjvuDocument:getUsedBBox(pageno)
-	--local hash = "pgubbox|"..self.file.."|"..pageno
-	--local cached = Cache:check(hash)
-	--if cached then
-		--return cached.data
-	--end
-	--local page = self._document:openPage(pageno)
+	-- djvu does not support usedbbox, so fake it.
 	local used = {}
 	used.x, used.y, used.w, used.h = 0.01, 0.01, -0.01, -0.01
-	--Cache:insert(hash, CacheItem:new{ used })
-	--page:close()
 	return used
 end
 
-function DjvuDocument:getPageText(pageno)
-	-- is this worth caching? not done yet.
-	local page = self._document:openPage(pageno)
-	local text = page:getPageText()
-	page:close()
-	return text
-end
-
-function DjvuDocument:renderPage(pageno, rect, zoom, rotation)
-	local hash = "renderpg|"..self.file.."|"..pageno.."|"..zoom.."|"..rotation
-	local page_size = self:getPageDimensions(pageno, zoom, rotation)
-	-- this will be the size we actually render
-	local size = page_size
-	-- we prefer to render the full page, if it fits into cache
-	if not Cache:willAccept(size.w * size.h / 2) then
-		-- whole page won't fit into cache
-		DEBUG("rendering only part of the page")
-		-- TODO: figure out how to better segment the page
-		if not rect then
-			DEBUG("aborting, since we do not have a specification for that part")
-			-- required part not given, so abort
-			return
-		end
-		-- only render required part
-		hash = "renderpg|"..self.file.."|"..pageno.."|"..zoom.."|"..rotation.."|"..tostring(rect)
-		size = rect
-	end
-
-	-- prepare cache item with contained blitbuffer	
-	local tile = CacheItem:new{
-		size = size.w * size.h / 2 + 64, -- estimation
-		excerpt = size,
-		pageno = pageno,
-		bb = Blitbuffer.new(size.w, size.h)
-	}
-
-	-- create a draw context
-	local dc = DrawContext.new()
-
-	dc:setRotate(rotation)
-	-- correction of rotation
-	if rotation == 90 then
-		dc:setOffset(page_size.w, 0)
-	elseif rotation == 180 then
-		dc:setOffset(page_size.w, page_size.h)
-	elseif rotation == 270 then
-		dc:setOffset(0, page_size.h)
-	end
-	dc:setZoom(zoom)
-
-	-- render
-	local page = self._document:openPage(pageno)
-	page:draw(dc, tile.bb, size.x, size.y)
-	page:close()
-	Cache:insert(hash, tile)
-
-	return tile
-end
-
--- a hint for the cache engine to paint a full page to the cache
--- TODO: this should trigger a background operation
-function DjvuDocument:hintPage(pageno, zoom, rotation)
-	self:renderPage(pageno, nil, zoom, rotation)
-end
-
-function DjvuDocument:drawPage(target, x, y, rect, pageno, zoom, rotation)
-	local hash_full_page = "renderpg|"..self.file.."|"..pageno.."|"..zoom.."|"..rotation
-	local hash_excerpt = "renderpg|"..self.file.."|"..pageno.."|"..zoom.."|"..rotation.."|"..tostring(rect)
-	local tile = Cache:check(hash_full_page)
-	if not tile then
-		tile = Cache:check(hash_excerpt)
-		if not tile then
-			DEBUG("rendering")
-			tile = self:renderPage(pageno, rect, zoom, rotation)
-		end
-	end
-	DEBUG("now painting", tile)
-	target:blitFrom(tile.bb, x, y, rect.x - tile.excerpt.x, rect.y - tile.excerpt.y, rect.w, rect.h)
-end
-
 function DjvuDocument:invertTextYAxel(pageno, text_table)
 	local _, height = self.doc:getOriginalPageSize(pageno)
 	for _,text in pairs(text_table) do