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require "unireader"
DJVUReader = UniReader:new{}
-- open a DJVU file and its settings store
-- DJVU does not support password yet
function DJVUReader:open(filename)
local ok
ok, self.doc = pcall(djvu.openDocument, filename, self.cache_document_size)
if not ok then
return ok, self.doc -- this will be the error message instead
end
return ok
end
function DJVUReader:init()
self:addAllCommands()
self:adjustDjvuReaderCommand()
end
function DJVUReader:adjustDjvuReaderCommand()
self.commands:del(KEY_J, MOD_SHIFT, "J")
self.commands:del(KEY_K, MOD_SHIFT, "K")
self.commands:add(KEY_R, nil, "R",
"select djvu page rendering mode",
function(self)
self:select_render_mode()
end)
end
-- select the rendering mode from those supported by djvulibre.
-- Note that if the values in the definition of ddjvu_render_mode_t in djvulibre/libdjvu/ddjvuapi.h change,
-- then we should update our values here also. This is a bit risky, but these values never change, so it should be ok :)
function DJVUReader:select_render_mode()
local mode_menu = SelectMenu:new{
menu_title = "Select DjVu page rendering mode",
item_array = {
"COLOUR (works for both colour and b&w pages)", -- 0 (colour page or stencil)
"BLACK & WHITE (for b&w pages only, much faster)", -- 1 (stencil or colour page)
"COLOUR ONLY (slightly faster than COLOUR)", -- 2 (colour page or fail)
"MASK ONLY (for b&w pages only)", -- 3 (stencil or fail)
"COLOUR BACKGROUND (show only background)", -- 4 (colour background layer)
"COLOUR FOREGROUND (show only foreground)" -- 5 (colour foreground layer)
},
current_entry = self.render_mode,
}
local mode = mode_menu:choose(0, fb.bb:getHeight())
if mode then
self.render_mode = mode - 1
self:clearCache()
end
self:redrawCurrentPage()
end
----------------------------------------------------
-- highlight support
----------------------------------------------------
function DJVUReader:getText(pageno)
return self.doc:getPageText(pageno)
end
-- for incompatible API fixing
function DJVUReader:invertTextYAxel(pageno, text_table)
local _, height = self.doc:getOriginalPageSize(pageno)
for _,text in pairs(text_table) do
for _,line in ipairs(text) do
line.y0, line.y1 = (height - line.y1), (height - line.y0)
end
end
return text_table
end
function DJVUReader:_drawReadingInfo()
local width, height = G_width, G_height
local numpages = self.doc:getPages()
local load_percent = self.pageno/numpages
local face = Font:getFace("rifont", 20)
local page_width, page_height, page_dpi, page_gamma, page_type = self.doc:getPageInfo(self.pageno)
-- display memory, time, battery and DjVu info on top of page
fb.bb:paintRect(0, 0, width, 40+6*2, 0)
renderUtf8Text(fb.bb, 10, 15+6, face,
"M: "..
math.ceil( self.cache_current_memsize / 1024 ).."/"..math.ceil( self.cache_max_memsize / 1024 ).."k, "..
math.ceil( self.doc:getCacheSize() / 1024 ).."/"..math.ceil( self.cache_document_size / 1024 ).."k, "..
os.date("%a %d %b %Y %T")..
" ["..BatteryLevel().."]", true)
renderUtf8Text(fb.bb, 10, 15+6+22, face,
"Gm:"..string.format("%.1f",self.globalgamma).." ["..tostring(page_gamma).."], "..
tostring(page_width).."x"..tostring(page_height)..", "..
tostring(page_dpi).."dpi, "..page_type, true)
-- display reading progress on bottom of page
local ypos = height - 50
fb.bb:paintRect(0, ypos, width, 50, 0)
ypos = ypos + 15
local cur_section = self:getTocTitleOfCurrentPage()
if cur_section ~= "" then
cur_section = "Sec: "..cur_section
end
renderUtf8Text(fb.bb, 10, ypos+6, face,
"Page: "..self.pageno.."/"..numpages.." "..cur_section, true)
ypos = ypos + 15
blitbuffer.progressBar(fb.bb, 10, ypos, width-20, 15,
5, 4, load_percent, 8)
end
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