mirror of https://github.com/koreader/koreader
add koptreader demo
parent
631f56bc78
commit
c462090600
@ -0,0 +1,185 @@
|
||||
require "cache"
|
||||
require "ui/geometry"
|
||||
require "ui/screen"
|
||||
require "ui/device"
|
||||
|
||||
-- Any document processed by K2pdfopt is called a koptdocument
|
||||
KoptDocument = Document:new{
|
||||
_document = false,
|
||||
-- muPDF manages its own additional cache
|
||||
mupdf_cache_size = 5 * 1024 * 1024,
|
||||
djvulibre_cache_size = nil,
|
||||
dc_null = DrawContext.new(),
|
||||
screen_size = Screen:getSize(),
|
||||
screen_dpi = Device:getModel() == "KindlePaperWhite" and 212 or 167,
|
||||
configurable = {
|
||||
font_size = 1.2,
|
||||
page_margin = 0.06,
|
||||
line_spacing = 1.2,
|
||||
word_spacing = 0.15,
|
||||
quality = 1.0,
|
||||
text_wrap = 1,
|
||||
defect_size = 1.0,
|
||||
trim_page = 1,
|
||||
detect_indent = 1,
|
||||
multi_threads = 0,
|
||||
auto_straighten = 0,
|
||||
justification = -1,
|
||||
max_columns = 2,
|
||||
contrast = 1.0,
|
||||
screen_rotation = 0,
|
||||
}
|
||||
}
|
||||
|
||||
function KoptDocument:init()
|
||||
self.file_type = string.lower(string.match(self.file, ".+%.([^.]+)") or "")
|
||||
if self.file_type == "pdf" then
|
||||
local ok
|
||||
ok, self._document = pcall(pdf.openDocument, self.file, self.mupdf_cache_size)
|
||||
if not ok then
|
||||
self.error_message = self.doc -- will contain error message
|
||||
return
|
||||
end
|
||||
self.is_open = true
|
||||
self.info.has_pages = true
|
||||
if self._document:needsPassword() then
|
||||
self.is_locked = true
|
||||
else
|
||||
self:_readMetadata()
|
||||
end
|
||||
|
||||
elseif self.file_type == "djvu" then
|
||||
if not validDjvuFile(self.file) then
|
||||
self.error_message = "Not a valid DjVu file"
|
||||
return
|
||||
end
|
||||
|
||||
local ok
|
||||
ok, self._document = pcall(djvu.openDocument, self.file, self.djvulibre_cache_size)
|
||||
if not ok then
|
||||
self.error_message = self.doc -- will contain error message
|
||||
return
|
||||
end
|
||||
self.is_open = true
|
||||
self.info.has_pages = true
|
||||
self:_readMetadata()
|
||||
end
|
||||
end
|
||||
|
||||
function KoptDocument:unlock(password)
|
||||
if not self._document:authenticatePassword(password) then
|
||||
self._document:close()
|
||||
return false, "wrong password"
|
||||
end
|
||||
self.is_locked = false
|
||||
return self:_readMetadata()
|
||||
end
|
||||
|
||||
-- check DjVu magic string to validate
|
||||
function validDjvuFile(filename)
|
||||
f = io.open(filename, "r")
|
||||
if not f then return false end
|
||||
local magic = f:read(8)
|
||||
f:close()
|
||||
if not magic or magic ~= "AT&TFORM" then return false end
|
||||
return true
|
||||
end
|
||||
|
||||
function KoptDocument:getUsedBBox(pageno)
|
||||
if self.file_type == "pdf" then
|
||||
local hash = "pgubbox|"..self.file.."|"..pageno
|
||||
local cached = Cache:check(hash)
|
||||
if cached then
|
||||
return cached.data
|
||||
end
|
||||
local page = self._document:openPage(pageno)
|
||||
local used = {}
|
||||
local native_dim = self:getNativePageDimensions(pageno)
|
||||
used.x, used.y, used.w, used.h = 0, 0, native_dim.w, native_dim.h
|
||||
Cache:insert(hash, CacheItem:new{ used })
|
||||
page:close()
|
||||
return used
|
||||
elseif self.file_type == "djvu" then
|
||||
-- djvu does not support usedbbox, so fake it.
|
||||
local used = {}
|
||||
local native_dim = self:getNativePageDimensions(pageno)
|
||||
used.x, used.y, used.w, used.h = 0, 0, native_dim.w, native_dim.h
|
||||
return used
|
||||
end
|
||||
end
|
||||
|
||||
-- get reflow context
|
||||
function KoptDocument:getKOPTContext(pageno)
|
||||
local kc = KOPTContext.new()
|
||||
kc:setTrim(self.configurable.trim_page)
|
||||
kc:setWrap(self.configurable.text_wrap)
|
||||
kc:setIndent(self.configurable.detect_indent)
|
||||
kc:setRotate(self.configurable.screen_rotation)
|
||||
kc:setColumns(self.configurable.max_columns)
|
||||
kc:setDeviceDim(self.screen_size.w, self.screen_size.h)
|
||||
kc:setDeviceDPI(self.screen_dpi)
|
||||
kc:setStraighten(self.configurable.auto_straighten)
|
||||
kc:setJustification(self.configurable.justification)
|
||||
kc:setZoom(self.configurable.font_size)
|
||||
kc:setMargin(self.configurable.page_margin)
|
||||
kc:setQuality(self.configurable.quality)
|
||||
kc:setContrast(self.configurable.contrast)
|
||||
kc:setDefectSize(self.configurable.defect_size)
|
||||
kc:setLineSpacing(self.configurable.line_spacing)
|
||||
kc:setWordSpacing(self.configurable.word_spacing)
|
||||
local bbox = self:getUsedBBox(pageno)
|
||||
kc:setBBox(bbox.x, bbox.y, bbox.w, bbox.h)
|
||||
return kc
|
||||
end
|
||||
|
||||
-- calculates page dimensions
|
||||
function KoptDocument:getPageDimensions(pageno, zoom, rotation)
|
||||
DEBUG("Warnning: cannot determine page size before reflowing.")
|
||||
return Screen:getSize()
|
||||
end
|
||||
|
||||
function KoptDocument:renderPage(pageno, rect, zoom, rotation, render_mode)
|
||||
local hash = "renderpg|"..self.file.."|"..pageno.."|"..zoom.."|"..rotation
|
||||
--local page_size = self:getPageDimensions(pageno, zoom, rotation)
|
||||
local kc = self:getKOPTContext(pageno)
|
||||
local page = self._document:openPage(pageno)
|
||||
-- reflow page
|
||||
page:reflow(kc, render_mode)
|
||||
local fullwidth, fullheight = kc:getPageDim()
|
||||
DEBUG("page::reflowPage:", "fullwidth:", fullwidth, "fullheight:", fullheight)
|
||||
local page_size = Geom:new{ w = fullwidth, h = fullheight }
|
||||
-- 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)
|
||||
}
|
||||
|
||||
-- draw to blitbuffer
|
||||
page:rfdraw(kc, tile.bb)
|
||||
page:close()
|
||||
Cache:insert(hash, tile)
|
||||
|
||||
return tile
|
||||
end
|
||||
|
||||
DocumentRegistry:addProvider("pdf", "application/pdf", KoptDocument)
|
||||
DocumentRegistry:addProvider("djvu", "application/djvu", KoptDocument)
|
Loading…
Reference in New Issue