mirror of
https://github.com/foliojs/pdfkit.git
synced 2025-12-08 20:15:54 +00:00
Switch to using Node's built in zlib bindings. Fixes #48.
This commit is contained in:
Devon Govett
parent
a39c7d0995
commit
b9da8ebedd
@ -15,7 +15,7 @@ class PDFDocument
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@version = 1.3
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# Whether streams should be compressed
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@compress = true
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@compress = yes
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# The PDF object store
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@store = new PDFObjectStore
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@ -80,30 +80,34 @@ class PDFDocument
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@page.content.add str
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return this # make chaining possible
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write: (filename, callback) ->
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fs.writeFile filename, @output(), 'binary', callback
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write: (filename, fn) ->
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@output (out) ->
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fs.writeFile filename, out, 'binary', fn
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output: ->
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out = []
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@finalize()
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@generateHeader out
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@generateBody out
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@generateXRef out
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@generateTrailer out
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return out.join('\n')
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output: (fn) ->
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@finalize =>
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out = []
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@generateHeader out
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@generateBody out, =>
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@generateXRef out
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@generateTrailer out
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fn out.join('\n')
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finalize: ->
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finalize: (fn) ->
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# convert strings in the info dictionary to literals
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for key, val of @info when typeof val is 'string'
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@info[key] = PDFObject.s val
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# embed the subsetted fonts
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for family, font of @_fontFamilies
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font.embed()
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# finalize each page
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for page in @pages
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page.finalize()
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@embedFonts =>
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# embed the images
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@embedImages =>
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done = 0
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cb = => fn() if ++done is @pages.length
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# finalize each page
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for page in @pages
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page.finalize(cb)
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generateHeader: (out) ->
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# PDF version
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@ -113,17 +117,20 @@ class PDFDocument
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out.push "%\xFF\xFF\xFF\xFF\n"
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return out
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generateBody: (out) ->
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generateBody: (out, fn) ->
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offset = out.join('\n').length
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for id, ref of @store.objects
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object = ref.object()
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ref.offset = offset
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out.push object
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offset += object.length + 1
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@xref_offset = offset
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refs = (ref for id, ref of @store.objects)
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do proceed = =>
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if ref = refs.shift()
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ref.object @compress, (object) ->
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ref.offset = offset
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out.push object
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offset += object.length + 1
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proceed()
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else
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@xref_offset = offset
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fn()
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generateXRef: (out) ->
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len = @store.length + 1
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@ -6,7 +6,7 @@ By Devon Govett
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TTFFont = require './font/ttf'
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AFMFont = require './font/afm'
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Subset = require './font/subset'
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zlib = require 'flate'
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zlib = require 'zlib'
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class PDFFont
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constructor: (@document, @filename, @family, @id) ->
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@ -29,8 +29,9 @@ class PDFFont
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use: (characters) ->
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@subset?.use characters
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embed: ->
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@embedTTF() unless @isAFM
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embed: (fn) ->
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return fn() if @isAFM
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@embedTTF fn
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encode: (text) ->
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@subset?.encodeText(text) or text
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@ -78,52 +79,54 @@ class PDFFont
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Type: 'Font'
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Subtype: 'TrueType'
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embedTTF: ->
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embedTTF: (fn) ->
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data = @subset.encode()
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compressedData = zlib.deflate(data)
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zlib.deflate data, (err, compressedData) =>
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throw err if err
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@fontfile = @document.ref
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Length: compressedData.length
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Length1: data.length
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Filter: 'FlateDecode'
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@fontfile = @document.ref
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Length: compressedData.length
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Length1: data.length
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Filter: 'FlateDecode'
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@fontfile.add compressedData
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@fontfile.add compressedData
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@descriptor = @document.ref
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Type: 'FontDescriptor'
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FontName: @subset.postscriptName
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FontFile2: @fontfile
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FontBBox: @bbox
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Flags: @flags
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StemV: @stemV
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ItalicAngle: @italicAngle
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Ascent: @ascender
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Descent: @decender
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CapHeight: @capHeight
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XHeight: @xHeight
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@descriptor = @document.ref
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Type: 'FontDescriptor'
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FontName: @subset.postscriptName
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FontFile2: @fontfile
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FontBBox: @bbox
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Flags: @flags
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StemV: @stemV
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ItalicAngle: @italicAngle
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Ascent: @ascender
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Descent: @decender
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CapHeight: @capHeight
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XHeight: @xHeight
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firstChar = +Object.keys(@subset.cmap)[0]
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charWidths = for code, glyph of @subset.cmap
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Math.round @ttf.hmtx.forGlyph(glyph).advance * @scaleFactor
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firstChar = +Object.keys(@subset.cmap)[0]
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charWidths = for code, glyph of @subset.cmap
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Math.round @ttf.hmtx.forGlyph(glyph).advance * @scaleFactor
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cmap = @document.ref()
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cmap.add toUnicodeCmap(@subset.subset)
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cmap.finalize(true) # compress it
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cmap = @document.ref()
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cmap.add toUnicodeCmap(@subset.subset)
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ref =
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Type: 'Font'
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BaseFont: @subset.postscriptName
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Subtype: 'TrueType'
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FontDescriptor: @descriptor
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FirstChar: firstChar
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LastChar: firstChar + charWidths.length - 1
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Widths: @document.ref charWidths
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Encoding: 'MacRomanEncoding'
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ToUnicode: cmap
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ref =
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Type: 'Font'
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BaseFont: @subset.postscriptName
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Subtype: 'TrueType'
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FontDescriptor: @descriptor
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FirstChar: firstChar
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LastChar: firstChar + charWidths.length - 1
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Widths: @document.ref charWidths
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Encoding: 'MacRomanEncoding'
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ToUnicode: cmap
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for key, val of ref
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@ref.data[key] = val
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for key, val of ref
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@ref.data[key] = val
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cmap.finalize(@document.compress, fn) # compress it
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toUnicodeCmap = (map) ->
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unicodeMap = '''
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@ -2,11 +2,6 @@ fs = require 'fs'
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Data = '../data'
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class JPEG
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@open: (filename) ->
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contents = fs.readFileSync filename
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data = new Data(contents)
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new JPEG(data)
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constructor: (@data) ->
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len = data.length
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@ -36,7 +31,7 @@ class JPEG
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@imgData = @data
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object: (document) ->
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object: (document, fn) ->
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obj = document.ref
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Type: 'XObject'
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Subtype: 'Image'
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@ -54,6 +49,6 @@ class JPEG
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obj.data['Decode'] = [1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0]
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obj.add @data.data
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return obj
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fn obj
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module.exports = JPEG
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@ -1,13 +1,8 @@
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fs = require 'fs'
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Data = '../data'
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zlib = require 'flate'
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zlib = require 'zlib'
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class PNG
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@open: (filename) ->
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contents = fs.readFileSync filename
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data = new Data(contents)
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new PNG(data)
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constructor: (@data) ->
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data.pos = 8 # Skip the default header
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@ -84,7 +79,22 @@ class PNG
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return
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object: (document) ->
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object: (document, fn) ->
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# get the async stuff out of the way first
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if not @alphaChannel
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if @transparency.indexed
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# Create a transparency SMask for the image based on the data
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# in the PLTE and tRNS sections. See below for details on SMasks.
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@loadIndexedAlphaChannel => @object document, fn
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return
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else if @hasAlphaChannel
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# For PNG color types 4 and 6, the transparency data is stored as a alpha
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# channel mixed in with the main image data. Separate this data out into an
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# SMask object and store it separately in the PDF.
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@splitAlphaChannel => @object document, fn
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return
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obj = document.ref
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Type: 'XObject'
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Subtype: 'Image'
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@ -130,18 +140,6 @@ class PNG
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mask.push x, x
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obj.data['Mask'] = mask
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else if @transparency.indexed
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# Create a transparency SMask for the image based on the data
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# in the PLTE and tRNS sections. See below for details on SMasks.
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@loadIndexedAlphaChannel()
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# For PNG color types 4 and 6, the transparency data is stored as a alpha
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# channel mixed in with the main image data. Separate this data out into an
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# SMask object and store it separately in the PDF.
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if @hasAlphaChannel
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@splitAlphaChannel()
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obj.data['Length'] = @imgData.length
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if @alphaChannel
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sMask = document.ref
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@ -160,105 +158,112 @@ class PNG
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# add the actual image data
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obj.add @imgData
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return obj
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fn obj
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decodePixels: ->
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data = zlib.inflate @imgData
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pixelBytes = @pixelBitlength / 8
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scanlineLength = pixelBytes * @width
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row = 0
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pixels = []
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length = data.length
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pos = 0
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while pos < length
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filter = data[pos++]
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i = 0
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rowData = []
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switch filter
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when 0 # None
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while i < scanlineLength
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rowData[i++] = data[pos++]
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when 1 # Sub
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while i < scanlineLength
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byte = data[pos++]
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left = if i < pixelBytes then 0 else rowData[i - pixelBytes]
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rowData[i++] = (byte + left) % 256
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when 2 # Up
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while i < scanlineLength
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byte = data[pos++]
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col = (i - (i % pixelBytes)) / pixelBytes
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upper = if row is 0 then 0 else pixels[row - 1][col][i % pixelBytes]
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rowData[i++] = (upper + byte) % 256
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when 3 # Average
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while i < scanlineLength
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byte = data[pos++]
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col = (i - (i % pixelBytes)) / pixelBytes
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left = if i < pixelBytes then 0 else rowData[i - pixelBytes]
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upper = if row is 0 then 0 else pixels[row - 1][col][i % pixelBytes]
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rowData[i++] = (byte + Math.floor((left + upper) / 2)) % 256
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when 4 # Paeth
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while i < scanlineLength
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byte = data[pos++]
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col = (i - (i % pixelBytes)) / pixelBytes
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left = if i < pixelBytes then 0 else rowData[i - pixelBytes]
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if row is 0
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upper = upperLeft = 0
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else
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upper = pixels[row - 1][col][i % pixelBytes]
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upperLeft = if col is 0 then 0 else pixels[row - 1][col - 1][i % pixelBytes]
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p = left + upper - upperLeft
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pa = Math.abs(p - left)
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pb = Math.abs(p - upper)
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pc = Math.abs(p - upperLeft)
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if pa <= pb and pa <= pc
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paeth = left
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else if pb <= pc
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paeth = upper
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else
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paeth = upperLeft
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rowData[i++] = (byte + paeth) % 256
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else
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throw new Error "Invalid filter algorithm: " + filter
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s = []
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for i in [0...rowData.length] by pixelBytes
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s.push rowData.slice(i, i + pixelBytes)
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pixels.push(s)
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row += 1
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decodePixels: (fn) ->
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zlib.inflate @imgData, (err, data) =>
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throw err if err
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return pixels
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splitAlphaChannel: ->
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pixels = @decodePixels()
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pixelBytes = @pixelBitlength / 8
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scanlineLength = pixelBytes * @width
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colorByteSize = @colors * @bits / 8
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alphaByteSize = 1
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row = 0
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pixels = []
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length = data.length
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pos = 0
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pixelCount = @width * @height
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imgData = new Buffer(pixelCount * colorByteSize)
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alphaChannel = new Buffer(pixelCount)
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while pos < length
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filter = data[pos++]
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i = 0
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rowData = []
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switch filter
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when 0 # None
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while i < scanlineLength
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rowData[i++] = data[pos++]
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when 1 # Sub
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while i < scanlineLength
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byte = data[pos++]
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left = if i < pixelBytes then 0 else rowData[i - pixelBytes]
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rowData[i++] = (byte + left) % 256
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when 2 # Up
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while i < scanlineLength
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byte = data[pos++]
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col = (i - (i % pixelBytes)) / pixelBytes
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upper = if row is 0 then 0 else pixels[row - 1][col][i % pixelBytes]
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rowData[i++] = (upper + byte) % 256
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when 3 # Average
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while i < scanlineLength
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byte = data[pos++]
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col = (i - (i % pixelBytes)) / pixelBytes
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left = if i < pixelBytes then 0 else rowData[i - pixelBytes]
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upper = if row is 0 then 0 else pixels[row - 1][col][i % pixelBytes]
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rowData[i++] = (byte + Math.floor((left + upper) / 2)) % 256
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when 4 # Paeth
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while i < scanlineLength
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byte = data[pos++]
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col = (i - (i % pixelBytes)) / pixelBytes
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left = if i < pixelBytes then 0 else rowData[i - pixelBytes]
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if row is 0
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upper = upperLeft = 0
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else
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upper = pixels[row - 1][col][i % pixelBytes]
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upperLeft = if col is 0 then 0 else pixels[row - 1][col - 1][i % pixelBytes]
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p = left + upper - upperLeft
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pa = Math.abs(p - left)
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pb = Math.abs(p - upper)
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pc = Math.abs(p - upperLeft)
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if pa <= pb and pa <= pc
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paeth = left
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else if pb <= pc
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paeth = upper
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else
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paeth = upperLeft
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rowData[i++] = (byte + paeth) % 256
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else
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throw new Error "Invalid filter algorithm: " + filter
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s = []
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for i in [0...rowData.length] by pixelBytes
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s.push rowData.slice(i, i + pixelBytes)
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pixels.push(s)
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row += 1
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fn pixels
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p = a = 0
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for row in pixels
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for pixel in row
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imgData[p++] = pixel[i] for i in [0...colorByteSize]
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alphaChannel[a++] = pixel[colorByteSize]
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splitAlphaChannel: (fn) ->
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@decodePixels (pixels) =>
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colorByteSize = @colors * @bits / 8
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alphaByteSize = 1
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pixelCount = @width * @height
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imgData = new Buffer(pixelCount * colorByteSize)
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alphaChannel = new Buffer(pixelCount)
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@imgData = zlib.deflate imgData
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@alphaChannel = zlib.deflate alphaChannel
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p = a = 0
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for row in pixels
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for pixel in row
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imgData[p++] = pixel[i] for i in [0...colorByteSize]
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alphaChannel[a++] = pixel[colorByteSize]
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done = 0
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zlib.deflate imgData, (err, @imgData) =>
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throw err if err
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fn() if ++done is 2
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zlib.deflate alphaChannel, (err, @alphaChannel) =>
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throw err if err
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fn() if ++done is 2
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decodePalette: ->
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palette = @palette
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@ -273,19 +278,20 @@ class PNG
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return decodingMap
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loadIndexedAlphaChannel: ->
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loadIndexedAlphaChannel: (fn) ->
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palette = @decodePalette()
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pixels = @decodePixels()
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@decodePixels (pixels) =>
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pixelCount = @width * @height
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alphaChannel = new Buffer(pixelCount)
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pixelCount = @width * @height
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alphaChannel = new Buffer(pixelCount)
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i = 0
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for row in pixels
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for pixel in row
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pixel = pixel[0]
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alphaChannel[i++] = palette[pixel][3]
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i = 0
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for row in pixels
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for pixel in row
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pixel = pixel[0]
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alphaChannel[i++] = palette[pixel][3]
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@alphaChannel = zlib.deflate alphaChannel
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zlib.deflate alphaChannel, (err, @alphaChannel) =>
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throw err if err
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fn()
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|
||||
module.exports = PNG
|
||||
@ -48,4 +48,10 @@ module.exports =
|
||||
registerFont: (name, path, family) ->
|
||||
@_registeredFonts[name] =
|
||||
filename: path
|
||||
family: family
|
||||
family: family
|
||||
|
||||
embedFonts: (fn) ->
|
||||
fonts = (font for family, font of @_fontFamilies)
|
||||
do proceed = =>
|
||||
return fn() if fonts.length is 0
|
||||
fonts.shift().embed(proceed)
|
||||
@ -14,13 +14,12 @@ module.exports =
|
||||
y = y ? options.y ? @y
|
||||
|
||||
if @_imageRegistry[src]
|
||||
[image, obj, label] = @_imageRegistry[src]
|
||||
[image, @page, label] = @_imageRegistry[src]
|
||||
|
||||
else
|
||||
image = PDFImage.open(src)
|
||||
obj = image.object(this)
|
||||
label = "I" + (++@_imageCount)
|
||||
@_imageRegistry[src] = [image, obj, label]
|
||||
@_imageRegistry[src] = [image, @page, label]
|
||||
|
||||
w = options.width or image.width
|
||||
h = options.height or image.height
|
||||
@ -52,13 +51,22 @@ module.exports =
|
||||
|
||||
# Set the current y position to below the image if it is in the document flow
|
||||
@y += h if @y is y
|
||||
|
||||
y = @page.height - y - h
|
||||
@page.xobjects[label] ?= obj
|
||||
|
||||
@save()
|
||||
@addContent "#{w} 0 0 #{h} #{x} #{y} cm"
|
||||
@addContent "/#{label} Do"
|
||||
@restore()
|
||||
|
||||
return this
|
||||
return this
|
||||
|
||||
embedImages: (fn) ->
|
||||
images = (item for src, item of @_imageRegistry)
|
||||
do proceed = =>
|
||||
if images.length
|
||||
[image, page, label] = images.shift()
|
||||
image.object this, (obj) ->
|
||||
page.xobjects[label] ?= obj
|
||||
proceed()
|
||||
else
|
||||
fn()
|
||||
@ -3,10 +3,10 @@ PDFObject - converts JavaScript types into their corrisponding PDF types.
|
||||
By Devon Govett
|
||||
###
|
||||
|
||||
pad = (str, length) ->
|
||||
(Array(length + 1).join('0') + str).slice(-length)
|
||||
|
||||
class PDFObject
|
||||
pad = (str, length) ->
|
||||
(Array(length + 1).join('0') + str).slice(-length)
|
||||
|
||||
@convert: (object) ->
|
||||
if Array.isArray object
|
||||
items = (PDFObject.convert e for e in object).join(' ')
|
||||
|
||||
@ -5,8 +5,8 @@ By Devon Govett
|
||||
|
||||
class PDFPage
|
||||
constructor: (@document, options = {}) ->
|
||||
@size = options.size or "letter"
|
||||
@layout = options.layout or "portrait"
|
||||
@size = options.size or 'letter'
|
||||
@layout = options.layout or 'portrait'
|
||||
|
||||
# if margin was passed as a single number
|
||||
if typeof options.margin is 'number'
|
||||
@ -55,8 +55,8 @@ class PDFPage
|
||||
maxY: ->
|
||||
@height - @margins.bottom
|
||||
|
||||
finalize: ->
|
||||
@content.finalize(@document.compress)
|
||||
finalize: (fn) ->
|
||||
@content.finalize(@document.compress, fn)
|
||||
|
||||
DEFAULT_MARGINS =
|
||||
top: 72
|
||||
|
||||
@ -3,7 +3,7 @@ PDFReference - represents a reference to another object in the PDF object heirar
|
||||
By Devon Govett
|
||||
###
|
||||
|
||||
zlib = require 'flate'
|
||||
zlib = require 'zlib'
|
||||
|
||||
class PDFReference
|
||||
constructor: (@id, @data = {}) ->
|
||||
@ -11,8 +11,10 @@ class PDFReference
|
||||
@stream = null
|
||||
@finalizedStream = null
|
||||
|
||||
object: ->
|
||||
@finalize() if not @finalizedStream
|
||||
object: (compress, fn) ->
|
||||
unless @finalizedStream?
|
||||
return @finalize compress, => @object compress, fn
|
||||
|
||||
out = ["#{@id} #{@gen} obj"]
|
||||
out.push PDFObject.convert(@data)
|
||||
|
||||
@ -22,30 +24,33 @@ class PDFReference
|
||||
out.push "endstream"
|
||||
|
||||
out.push "endobj"
|
||||
return out.join '\n'
|
||||
fn out.join '\n'
|
||||
|
||||
add: (s) ->
|
||||
@stream ?= []
|
||||
@stream.push if Buffer.isBuffer(s) then s.toString('binary') else s
|
||||
|
||||
finalize: (compress = false) ->
|
||||
finalize: (compress = false, fn) ->
|
||||
# cache the finalized stream
|
||||
if @stream
|
||||
data = @stream.join '\n'
|
||||
if compress
|
||||
if compress and not @data.Filter
|
||||
# create a byte array instead of passing a string to the Buffer
|
||||
# fixes a weird unicode bug.
|
||||
data = new Buffer(data.charCodeAt(i) for i in [0...data.length])
|
||||
compressedData = zlib.deflate(data)
|
||||
@finalizedStream = compressedData.toString 'binary'
|
||||
|
||||
@data.Filter = 'FlateDecode'
|
||||
zlib.deflate data, (err, compressedData) =>
|
||||
throw err if err
|
||||
@finalizedStream = compressedData.toString 'binary'
|
||||
@data.Filter = 'FlateDecode'
|
||||
@data.Length = @finalizedStream.length
|
||||
fn()
|
||||
else
|
||||
@finalizedStream = data
|
||||
|
||||
@data.Length ?= @finalizedStream.length
|
||||
@data.Length = @finalizedStream.length
|
||||
fn()
|
||||
else
|
||||
@finalizedStream = ''
|
||||
fn()
|
||||
|
||||
toString: ->
|
||||
"#{@id} #{@gen} R"
|
||||
|
||||
@ -9,14 +9,13 @@ class PDFObjectStore
|
||||
constructor: ->
|
||||
@objects = {}
|
||||
@length = 0
|
||||
|
||||
|
||||
@root = @ref
|
||||
Type: 'Catalog'
|
||||
|
||||
@root.data['Pages'] = @ref
|
||||
Type: 'Pages'
|
||||
Count: 0
|
||||
Kids: []
|
||||
Pages: @ref
|
||||
Type: 'Pages'
|
||||
Count: 0
|
||||
Kids: []
|
||||
|
||||
@pages = @root.data['Pages']
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user