mirror of
https://github.com/koreader/koreader
synced 2024-11-10 01:10:34 +00:00
8e4516b824
In regional zoom mode double tap will zoom to the tapped region(paragraph or column, etc., detected optically via libk2pdfopt). As the first demo, this feature is only turned on in flipping mode by tapping the top-left corner of the screen. Eventually we may incorporate this feature in "free" zoom mode.
120 lines
3.6 KiB
Lua
120 lines
3.6 KiB
Lua
local Geom = require("ui/geometry")
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local Cache = require("cache")
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local CacheItem = require("cacheitem")
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local KoptOptions = require("ui/data/koptoptions")
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local KoptInterface = require("document/koptinterface")
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local Document = require("document/document")
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local Configurable = require("ui/reader/configurable")
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local DrawContext = require("ffi/drawcontext")
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local DjvuDocument = Document:new{
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_document = false,
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-- libdjvulibre manages its own additional cache, default value is hard written in c module.
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djvulibre_cache_size = nil,
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dc_null = DrawContext.new(),
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options = KoptOptions,
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koptinterface = KoptInterface,
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}
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-- check DjVu magic string to validate
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local function validDjvuFile(filename)
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f = io.open(filename, "r")
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if not f then return false end
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local magic = f:read(8)
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f:close()
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if not magic or magic ~= "AT&TFORM" then return false end
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return true
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end
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function DjvuDocument:init()
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require "libs/libkoreader-djvu"
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self.configurable:loadDefaults(self.options)
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if not validDjvuFile(self.file) then
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self.error_message = "Not a valid DjVu file"
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return
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end
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local ok
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ok, self._document = pcall(djvu.openDocument, self.file, self.djvulibre_cache_size)
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if not ok then
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self.error_message = self.doc -- will contain error message
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return
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end
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self.is_open = true
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self.info.has_pages = true
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self.info.configurable = true
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self:_readMetadata()
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end
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function DjvuDocument:invertTextYAxel(pageno, text_table)
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local _, height = self.doc:getOriginalPageSize(pageno)
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for _,text in pairs(text_table) do
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for _,line in ipairs(text) do
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line.y0, line.y1 = (height - line.y1), (height - line.y0)
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end
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end
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return text_table
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end
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function DjvuDocument:getPageTextBoxes(pageno)
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return self._document:getPageText(pageno)
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end
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function DjvuDocument:getWordFromPosition(spos)
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return self.koptinterface:getWordFromPosition(self, spos)
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end
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function DjvuDocument:getTextFromPositions(spos0, spos1)
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return self.koptinterface:getTextFromPositions(self, spos0, spos1)
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end
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function DjvuDocument:getPageBoxesFromPositions(pageno, ppos0, ppos1)
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return self.koptinterface:getPageBoxesFromPositions(self, pageno, ppos0, ppos1)
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end
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function DjvuDocument:getOCRWord(pageno, wbox)
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return self.koptinterface:getOCRWord(self, pageno, wbox)
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end
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function DjvuDocument:getOCRText(pageno, tboxes)
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return self.koptinterface:getOCRText(self, pageno, tboxes)
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end
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function DjvuDocument:getPageRegions(pageno)
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return self.koptinterface:getPageRegions(self, pageno)
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end
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function DjvuDocument:getUsedBBox(pageno)
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-- djvu does not support usedbbox, so fake it.
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local used = {}
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local native_dim = self:getNativePageDimensions(pageno)
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used.x0, used.y0, used.x1, used.y1 = 0, 0, native_dim.w, native_dim.h
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return used
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end
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function DjvuDocument:getPageBBox(pageno)
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return self.koptinterface:getPageBBox(self, pageno)
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end
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function DjvuDocument:getPageDimensions(pageno, zoom, rotation)
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return self.koptinterface:getPageDimensions(self, pageno, zoom, rotation)
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end
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function DjvuDocument:renderPage(pageno, rect, zoom, rotation, gamma, render_mode)
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return self.koptinterface:renderPage(self, pageno, rect, zoom, rotation, gamma, render_mode)
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end
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function DjvuDocument:hintPage(pageno, zoom, rotation, gamma, render_mode)
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return self.koptinterface:hintPage(self, pageno, zoom, rotation, gamma, render_mode)
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end
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function DjvuDocument:drawPage(target, x, y, rect, pageno, zoom, rotation, gamma, render_mode)
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return self.koptinterface:drawPage(self, target, x, y, rect, pageno, zoom, rotation, gamma, render_mode)
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end
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function DjvuDocument:register(registry)
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registry:addProvider("djvu", "application/djvu", self)
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end
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return DjvuDocument
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