mirror of
https://github.com/koreader/koreader
synced 2024-10-31 21:20:20 +00:00
318 lines
11 KiB
Lua
318 lines
11 KiB
Lua
local Cache = require("cache")
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local CacheItem = require("cacheitem")
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local CanvasContext = require("document/canvascontext")
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local DocSettings = require("docsettings")
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local Document = require("document/document")
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local DrawContext = require("ffi/drawcontext")
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local logger = require("logger")
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local util = require("util")
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local ffi = require("ffi")
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local C = ffi.C
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local pdf = nil
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local PdfDocument = Document:new{
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_document = false,
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is_pdf = true,
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dc_null = DrawContext.new(),
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koptinterface = nil,
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provider = "mupdf",
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provider_name = "MuPDF",
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}
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function PdfDocument:init()
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if not pdf then pdf = require("ffi/mupdf") end
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-- mupdf.color has to stay false for kopt to work correctly
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-- and be accurate (including its job about showing highlight
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-- boxes). We will turn it on and off in PdfDocument:preRenderPage()
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-- and :postRenderPage() when mupdf is called without kopt involved.
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pdf.color = false
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self:updateColorRendering()
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self.koptinterface = require("document/koptinterface")
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self.koptinterface:setDefaultConfigurable(self.configurable)
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local ok
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ok, self._document = pcall(pdf.openDocument, self.file)
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if not ok then
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error(self._document) -- will contain error message
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end
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self.is_reflowable = self._document:isDocumentReflowable()
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self.reflowable_font_size = self:convertKoptToReflowableFontSize()
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-- no-op on PDF
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self:layoutDocument()
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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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if self._document:needsPassword() then
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self.is_locked = true
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else
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self:_readMetadata()
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end
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end
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function PdfDocument:layoutDocument(font_size)
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if font_size then
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self.reflowable_font_size = font_size
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end
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self._document:layoutDocument(
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CanvasContext:getWidth(),
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CanvasContext:getHeight(),
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CanvasContext:scaleBySize(self.reflowable_font_size))
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end
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local default_font_size = 22
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-- the koptreader config goes from 0.1 to 3.0, but we want a regular font size
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function PdfDocument:convertKoptToReflowableFontSize(font_size)
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if font_size then
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return font_size * default_font_size
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end
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local size
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if DocSettings:hasSidecarFile(self.file) then
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local doc_settings = DocSettings:open(self.file)
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size = doc_settings:readSetting("kopt_font_size")
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doc_settings:close()
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end
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if size then
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return size * default_font_size
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elseif G_reader_settings:readSetting("kopt_font_size") then
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return G_reader_settings:readSetting("kopt_font_size") * default_font_size
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elseif DKOPTREADER_CONFIG_FONT_SIZE then
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return DKOPTREADER_CONFIG_FONT_SIZE * default_font_size
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else
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return default_font_size
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end
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end
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function PdfDocument:preRenderPage()
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pdf.color = self.render_color
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end
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function PdfDocument:postRenderPage()
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pdf.color = false
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end
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function PdfDocument:unlock(password)
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if not self._document:authenticatePassword(password) then
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return false
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end
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self.is_locked = false
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self:_readMetadata()
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return true
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end
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function PdfDocument:getPageTextBoxes(pageno)
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local page = self._document:openPage(pageno)
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local text = page:getPageText()
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page:close()
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return text
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end
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function PdfDocument:getWordFromPosition(spos)
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return self.koptinterface:getWordFromPosition(self, spos)
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end
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function PdfDocument:getTextFromPositions(spos0, spos1)
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return self.koptinterface:getTextFromPositions(self, spos0, spos1)
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end
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function PdfDocument: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 PdfDocument:nativeToPageRectTransform(pageno, rect)
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return self.koptinterface:nativeToPageRectTransform(self, pageno, rect)
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end
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function PdfDocument:getOCRWord(pageno, wbox)
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return self.koptinterface:getOCRWord(self, pageno, wbox)
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end
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function PdfDocument:getOCRText(pageno, tboxes)
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return self.koptinterface:getOCRText(self, pageno, tboxes)
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end
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function PdfDocument:getPageBlock(pageno, x, y)
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return self.koptinterface:getPageBlock(self, pageno, x, y)
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end
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function PdfDocument:getUsedBBox(pageno)
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local hash = "pgubbox|"..self.file.."|"..self.reflowable_font_size.."|"..pageno
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local cached = Cache:check(hash)
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if cached then
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return cached.ubbox
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end
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local page = self._document:openPage(pageno)
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local used = {}
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used.x0, used.y0, used.x1, used.y1 = page:getUsedBBox()
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local pwidth, pheight = page:getSize(self.dc_null)
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-- clamp to page BBox
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if used.x0 < 0 then used.x0 = 0 end
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if used.x1 > pwidth then used.x1 = pwidth end
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if used.y0 < 0 then used.y0 = 0 end
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if used.y1 > pheight then used.y1 = pheight end
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--- @todo Give size for cacheitem? 02.12 2012 (houqp)
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Cache:insert(hash, CacheItem:new{
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ubbox = used,
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})
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page:close()
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return used
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end
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function PdfDocument:getPageLinks(pageno)
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local hash = "pglinks|"..self.file.."|"..self.reflowable_font_size.."|"..pageno
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local cached = Cache:check(hash)
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if cached then
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return cached.links
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end
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local page = self._document:openPage(pageno)
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local links = page:getPageLinks()
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Cache:insert(hash, CacheItem:new{
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links = links,
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})
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page:close()
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return links
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end
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function PdfDocument:saveHighlight(pageno, item)
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local suffix = util.getFileNameSuffix(self.file)
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if string.lower(suffix) ~= "pdf" then return end
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self.is_edited = true
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-- will also need mupdf_h.lua to be evaluated once
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-- but this is guaranteed at this point
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local n = #item.pboxes
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local quadpoints = ffi.new("float[?]", 8*n)
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for i=1, n do
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-- The order must be left bottom, right bottom, left top, right top.
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-- https://bugs.ghostscript.com/show_bug.cgi?id=695130
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quadpoints[8*i-8] = item.pboxes[i].x
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quadpoints[8*i-7] = item.pboxes[i].y + item.pboxes[i].h
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quadpoints[8*i-6] = item.pboxes[i].x + item.pboxes[i].w
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quadpoints[8*i-5] = item.pboxes[i].y + item.pboxes[i].h
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quadpoints[8*i-4] = item.pboxes[i].x
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quadpoints[8*i-3] = item.pboxes[i].y
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quadpoints[8*i-2] = item.pboxes[i].x + item.pboxes[i].w
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quadpoints[8*i-1] = item.pboxes[i].y
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end
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local page = self._document:openPage(pageno)
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local annot_type = C.PDF_ANNOT_HIGHLIGHT
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if item.drawer == "lighten" then
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annot_type = C.PDF_ANNOT_HIGHLIGHT
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elseif item.drawer == "underscore" then
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annot_type = C.PDF_ANNOT_UNDERLINE
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elseif item.drawer == "strikeout" then
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annot_type = C.PDF_ANNOT_STRIKEOUT
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end
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page:addMarkupAnnotation(quadpoints, n, annot_type)
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page:close()
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end
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function PdfDocument:writeDocument()
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logger.info("writing document to", self.file)
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self._document:writeDocument(self.file)
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end
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function PdfDocument:close()
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if self.is_edited then
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self:writeDocument()
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end
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Document.close(self)
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end
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function PdfDocument:getProps()
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local props = self._document:getMetadata()
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if props.title == "" then
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local startPos = util.lastIndexOf(self.file, "%/")
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if startPos > 0 then
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props.title = string.sub(self.file, startPos + 1, -5) --remove extension .pdf
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else
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props.title = string.sub(self.file, 0, -5)
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end
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end
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props.authors = props.author
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props.series = ""
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props.language = ""
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props.keywords = props.keywords
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props.description = props.subject
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return props
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end
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function PdfDocument:getLinkFromPosition(pageno, pos)
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return self.koptinterface:getLinkFromPosition(self, pageno, pos)
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end
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function PdfDocument:clipPagePNGFile(pos0, pos1, pboxes, drawer, filename)
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return self.koptinterface:clipPagePNGFile(self, pos0, pos1, pboxes, drawer, filename)
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end
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function PdfDocument:clipPagePNGString(pos0, pos1, pboxes, drawer)
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return self.koptinterface:clipPagePNGString(self, pos0, pos1, pboxes, drawer)
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end
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function PdfDocument:getPageBBox(pageno)
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return self.koptinterface:getPageBBox(self, pageno)
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end
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function PdfDocument: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 PdfDocument:getCoverPageImage()
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return self.koptinterface:getCoverPageImage(self)
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end
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function PdfDocument:findText(pattern, origin, reverse, caseInsensitive, page)
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return self.koptinterface:findText(self, pattern, origin, reverse, caseInsensitive, page)
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end
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function PdfDocument: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 PdfDocument: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 PdfDocument: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 PdfDocument:register(registry)
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--- Document types ---
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registry:addProvider("cbt", "application/vnd.comicbook+tar", self, 100)
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registry:addProvider("cbz", "application/vnd.comicbook+zip", self, 100)
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registry:addProvider("epub", "application/epub+zip", self, 50)
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registry:addProvider("fb2", "application/fb2", self, 80)
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registry:addProvider("htm", "text/html", self, 90)
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registry:addProvider("html", "text/html", self, 90)
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registry:addProvider("pdf", "application/pdf", self, 100)
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registry:addProvider("tar", "application/x-tar", self, 10)
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registry:addProvider("xhtml", "application/xhtml+xml", self, 100)
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registry:addProvider("xml", "application/xml", self, 10)
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registry:addProvider("xps", "application/oxps", self, 100)
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registry:addProvider("zip", "application/zip", self, 20)
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--- Picture types ---
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registry:addProvider("gif", "image/gif", self, 90)
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-- MS HD Photo == JPEG XR
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registry:addProvider("hdp", "image/vnd.ms-photo", self, 90)
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registry:addProvider("j2k", "image/jp2", self, 90)
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registry:addProvider("jp2", "image/jp2", self, 90)
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registry:addProvider("jpeg", "image/jpeg", self, 90)
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registry:addProvider("jpg", "image/jpeg", self, 90)
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-- JPEG XR
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registry:addProvider("jxr", "image/jxr", self, 90)
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registry:addProvider("pam", "image/x-portable-arbitrarymap", self, 90)
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registry:addProvider("pbm", "image/x‑portable‑bitmap", self, 90)
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registry:addProvider("pgm", "image/x‑portable‑bitmap", self, 90)
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registry:addProvider("png", "image/png", self, 90)
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registry:addProvider("pnm", "image/x‑portable‑bitmap", self, 90)
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registry:addProvider("ppm", "image/x‑portable‑bitmap", self, 90)
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registry:addProvider("svg", "image/svg+xml", self, 90)
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registry:addProvider("tif", "image/tiff", self, 90)
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registry:addProvider("tiff", "image/tiff", self, 90)
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-- Windows Media Photo == JPEG XR
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registry:addProvider("wdp", "image/vnd.ms-photo", self, 90)
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end
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return PdfDocument
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