Sneed-Group/Poodletooth-iLand
1
0
Fork 0
mirror of https://github.com/Sneed-Group/Poodletooth-iLand synced 2024-12-28 14:12:52 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions
Poodletooth-iLand/panda/python/Lib/site-packages/wx/lib/pdfviewer/viewer.py
Master Jumblespeed d882959bfa switch to remote
2015-05-18 22:11:33 -04:00

1098 lines
43 KiB
Python
Executable file
Raw Blame History

# Name: viewer.py
# Package: wx.lib.pdfviewer
#
# Purpose: A PDF report viewer class
#
# Author: David Hughes dfh@forestfield.co.uk
# Copyright: Forestfield Software Ltd
# Licence: Same as wxPython host
# History: Created 17 Jun 2009
#
# 08 Oct 2011, Michael Hipp michael@redmule.com
# Added prompt, printer_name, orientation options to
# pdfViewer.Print(). Added option to pdfViewer.LoadFile() to
# accept a file-like object as well as a path string
#
# Tags: phoenix-port, documented, unittest
#
#----------------------------------------------------------------------------
"""
This module provides the :class:`~lib.pdfviewer.viewer.pdfViewer` to view PDF
files.
"""
import sys
import os
import time
import types
import copy
import shutil
from wx.lib.six import BytesIO
USE_CAIRO = True
FONTSCALE = 1.0
CACHE_LATE_PAGES = True
LATE_THRESHOLD = 200 # Time to render (ttr), milliseconds
VERBOSE = False
fpypdf = 0
try:
import pyPdf
fpypdf = 1
except:
pass
try:
import PyPDF2
fpypdf = 2
except:
pass
if not fpypdf:
msg = "You either need pyPdf or pyPDF2 to use this."
raise ImportError(msg)
elif fpypdf == 2:
from PyPDF2 import PdfFileReader
from PyPDF2.pdf import ContentStream, PageObject
from PyPDF2.filters import ASCII85Decode, FlateDecode
elif fpypdf == 1:
from pyPdf import PdfFileReader
from pyPdf.pdf import ContentStream, PageObject
from pyPdf.filters import ASCII85Decode, FlateDecode
from dcgraphics import dcGraphicsContext
import wx
have_cairo = False
if USE_CAIRO and wx.VERSION_STRING > '2.8.10.1': # Cairo DrawBitmap bug fixed
try:
import cairo
from wx.lib.graphics import GraphicsContext
FONTSCALE = 1.0
have_cairo = True
if VERBOSE: print('Using Cairo')
except ImportError:
pass
if not have_cairo:
GraphicsContext = wx.GraphicsContext
if wx.PlatformInfo[1] == 'wxMSW': # for Windows only
FONTSCALE = 72.0 / 96.0 # wx.GraphicsContext fonts are too big in the ratio
# of screen pixels per inch to points per inch
if VERBOSE: print('Using wx.GraphicsContext')
""" If reportlab is installed, use its stringWidth metric. For justifying text,
where widths are cumulative, dc.GetTextExtent consistently underestimates,
possibly because it returns integer rather than float.
"""
try:
from reportlab.pdfbase.pdfmetrics import stringWidth
have_rlwidth = True
except ImportError:
have_rlwidth = False
#----------------------------------------------------------------------------
## New PageObject method added by Forestfield Software
def extractOperators(self):
"""
Locate and return all commands in the order they
occur in the content stream. Used by pdfviewer.
"""
ops = []
content = self["/Contents"].getObject()
if not isinstance(content, ContentStream):
content = ContentStream(content, self.pdf)
for op in content.operations:
ops.append(op)
return ops
# Inject this method into the PageObject class
PageObject.extractOperators = extractOperators
#----------------------------------------------------------------------------
class pdfViewer(wx.ScrolledWindow):
"""
View PDF report files in a scrolled window. Contents are read from PDF file
and rendered in a :class:`GraphicsContext`. Show visible window contents
as quickly as possible then read the whole file and build the set of drawing
commands for each page. This can take time for a big file or if there are complex
drawings eg. ReportLab's colour shading inside charts. Originally read in a thread
but navigation is limited until whole file is ready, so now done in main
thread with a progress bar, which isn't modal so can still do whatever navigation
is possible as the content availability increases.
"""
def __init__(self, parent, id, pos, size, style):
"""
Default class constructor.
:param Window `parent`: parent window. Must not be ``None``;
:param integer `id`: window identifier. A value of -1 indicates a default value;
:param `pos`: the control position. A value of (-1, -1) indicates a default position,
chosen by either the windowing system or wxPython, depending on platform;
:type `pos`: tuple or :class:`Point`
:param `size`: the control size. A value of (-1, -1) indicates a default size,
chosen by either the windowing system or wxPython, depending on platform;
:type `size`: tuple or :class:`Size`
:param integer `style`: the button style (unused);
"""
wx.ScrolledWindow.__init__(self, parent, id, pos, size,
style | wx.NO_FULL_REPAINT_ON_RESIZE)
self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM) # recommended in wxWidgets docs
self.buttonpanel = None # reference to panel is set by their common parent
self._showLoadProgress = True
self._usePrintDirect = True
self.Bind(wx.EVT_PAINT, self.OnPaint)
self.Bind(wx.EVT_SIZE, self.OnResize)
self.Bind(wx.EVT_SCROLLWIN, self.OnScroll)
self.Bind(wx.EVT_IDLE, self.OnIdle)
self.have_file = False
self.resizing = False
self.numpages = None
self.zoomscale = -1 # fit page to screen width
self.nom_page_gap = 20 # nominal inter-page gap (points)
self.scrollrate = 20 # pixels per scrollbar increment
self.ClearBackground()
def OnIdle(self, event):
"""
Redraw on resize.
"""
if self.resizing:
self.Render()
self.resizing = False
event.Skip()
def OnResize(self, event):
"""
Buffer size change due to client area resize.
"""
self.resizing = True
self.cachedpages = {}
event.Skip()
def OnScroll(self,event):
"""
Recalculate and redraw visible area. CallAfter is *essential*
for coordination.
"""
wx.CallAfter(self.Render, force=False)
event.Skip()
def OnPaint(self, event):
"""
Refresh visible window with bitmap contents.
"""
paintDC = wx.PaintDC(self)
if hasattr(self, 'pdc'):
paintDC.Blit(0, 0, self.winwidth, self.winheight, self.pdc,
self.xshift, self.yshift)
else:
paintDC.Clear()
#----------------------------------------------------------------------------
"The externally callable methods are: LoadFile, Save, Print, SetZoom, and GoPage"
def LoadFile(self, pdf_file):
"""
Read pdf file using pyPdf/pyPDF2. Assume all pages are same size, for now.
:param `pdf_file`: can be either a string holding a filename path or
a file-like object.
"""
if isinstance(pdf_file, types.StringTypes):
# it must be a filename/path string, open it as a file
f = file(pdf_file, 'rb')
self.pdfpathname = pdf_file
else:
# assume it is a file-like object
f = pdf_file
self.pdfpathname = '' # empty default file name
self.pdfdoc = PdfFileReader(f)
self.numpages = self.pdfdoc.getNumPages()
page1 = self.pdfdoc.getPage(0)
self.pagewidth = float(page1.mediaBox.getUpperRight_x())
self.pageheight = float(page1.mediaBox.getUpperRight_y())
self.Scroll(0,0) # in case this is a re-LoadFile
self.CalculateDimensions(True) # to get initial visible page range
self.unimplemented = {}
self.pagedrawings = {}
self.formdrawings = {}
self.cachedpages = {}
# draw and display the minimal set of pages
self.DrawFile(self.frompage, self.topage)
self.have_file = True
# now draw full set of pages
wx.CallAfter(self.DrawFile, 0, self.numpages-1)
def Save(self):
"""
A pdf-only Save.
"""
wild = "Portable document format (*.pdf)|*.pdf"
dlg = wx.FileDialog(self, message="Save file as ...",
wildcard=wild,
style=wx.FD_SAVE|wx.FD_OVERWRITE_PROMPT)
if dlg.ShowModal() == wx.ID_OK:
pathname = dlg.GetPath()
shutil.copy(self.pdfpathname, pathname)
dlg.Destroy()
def Print(self, prompt=True, printer_name=None, orientation=None):
"""
Print the pdf.
:param boolean `prompt`: show the print dialog to the user (True/False). If
False, the print dialog will not be shown and the pdf will be printed
immediately. Default: True.
:param string `printer_name`: the name of the printer that is to
receive the printout. Default: as set by the O/S.
:param `orientation`: select the orientation (:class:`wx.PORTRAIT` or
:class:`wx.LANDSCAPE`) for the printout. Default: as set by the O/S.
"""
pdd = wx.PrintDialogData()
pdd.SetMinPage(1)
pdd.SetFromPage(1)
pdd.SetMaxPage(self.numpages)
pdd.SetToPage(self.numpages)
pdata = pdd.GetPrintData()
if printer_name:
pdata.SetPrinterName(printer_name)
if orientation:
pdata.SetOrientation(orientation)
printer = wx.Printer(pdd)
printout = pdfPrintout('', self)
if (not printer.Print(self, printout, prompt=prompt) and
printer.GetLastError() == wx.PRINTER_ERROR):
dlg = wx.MessageDialog(self, 'Unable to perform printing',
'Printer' , wx.OK | wx.ICON_INFORMATION)
dlg.ShowModal()
dlg.Destroy()
printout.Destroy()
def SetZoom(self, zoomscale):
"""
Positive integer or floating zoom scale will render the file at
the corresponding size where 1.0 is "actual" point size (1/72").
-1 fits page width and -2 fits page height into client area
Redisplay the current page(s) at the new size
:param `zoomscale`: an integer or float
"""
pagenow = self.frompage
self.zoomscale = zoomscale
self.cachedpages = {}
self.CalculateDimensions(True)
self.GoPage(pagenow)
def GoPage(self, pagenum):
"""
Go to page
:param integer `pagenum`: go to the provided page number if it is valid
"""
if pagenum > 0 and pagenum <= self.numpages:
self.Scroll(0, pagenum*self.Ypagepixels/self.GetScrollPixelsPerUnit()[1])
else:
self.Scroll(0, 0)
self.Render()
#----------------------------------------------------------------------------
"This section is concerned with rendering a sub-set of drawing commands on demand"
def CalculateDimensions(self, force):
"""
Compute the required buffer sizes to hold the viewed rectangle and
the range of pages visible. Override force flag and set true if
the current set of rendered pages changes.
"""
self.frompage = 0
self.topage = 0
self.clientdc = dc = wx.ClientDC(self) # dc for device scaling
self.device_scale = dc.GetPPI()[0]/72.0 # pixels per inch / points per inch
self.winwidth, self.winheight = self.GetClientSize()
if self.winheight < 100:
return
self.Ypage = self.pageheight + self.nom_page_gap
if self.zoomscale > 0.0:
self.scale = self.zoomscale * self.device_scale
else:
if int(self.zoomscale) == -1: # fit width
self.scale = self.winwidth / self.pagewidth
else: # fit page
self.scale = self.winheight / self.pageheight
self.Xpagepixels = int(round(self.pagewidth*self.scale))
self.Ypagepixels = int(round(self.Ypage*self.scale))
# adjust inter-page gap so Ypagepixels is a whole number of scroll increments
# and page numbers change precisely on a scroll click
idiv = self.Ypagepixels/self.scrollrate
nlo = idiv * self.scrollrate
nhi = (idiv + 1) * self.scrollrate
if nhi - self.Ypagepixels < self.Ypagepixels - nlo:
self.Ypagepixels = nhi
else:
self.Ypagepixels = nlo
self.page_gap = self.Ypagepixels/self.scale - self.pageheight
self.maxwidth = max(self.winwidth, self.Xpagepixels)
self.maxheight = max(self.winheight, self.numpages*self.Ypagepixels)
self.SetVirtualSize((self.maxwidth, self.maxheight))
self.SetScrollRate(self.scrollrate,self.scrollrate)
xv, yv = self.GetViewStart()
dx, dy = self.GetScrollPixelsPerUnit()
self.x0, self.y0 = (xv * dx, yv * dy)
self.frompage = min(self.y0/self.Ypagepixels, self.numpages-1)
self.topage = min((self.y0+self.winheight-1)/self.Ypagepixels, self.numpages-1)
self.pagebufferwidth = max(self.Xpagepixels, self.winwidth)
self.pagebufferheight = (self.topage - self.frompage + 1) * self.Ypagepixels
# Inform buttonpanel controls of any changes
if self.buttonpanel:
self.buttonpanel.Update(self.frompage, self.numpages,
self.scale/self.device_scale)
self.page_y0 = self.frompage * self.Ypagepixels
self.page_x0 = 0
self.xshift = self.x0 - self.page_x0
self.yshift = self.y0 - self.page_y0
if force: # by external request
self.cur_frompage = self.frompage
self.cur_topage = self.topage
else: # page range unchanged? whole visible area will always be inside page buffer
if self.frompage != self.cur_frompage or self.topage != self.cur_topage:
force = True # due to page buffer change
self.cur_frompage = self.frompage
self.cur_topage = self.topage
return force
def Render(self, force=True):
"""
Recalculate dimensions as client area may have been scrolled or resized.
The smallest unit of rendering that can be done is the pdf page. So render
the drawing commands for the pages in the visible rectangle into a buffer
big enough to hold this set of pages. For each page, use gc.Translate to
render wrt the pdf origin, which is at the bottom left corner of the page.
Force re-creating the page buffer only when client view moves outside it.
"""
if not self.have_file:
return
force = self.CalculateDimensions(force)
if force:
# Initialize the buffer bitmap.
self.pagebuffer = wx.Bitmap(self.pagebufferwidth, self.pagebufferheight)
self.pdc = wx.MemoryDC(self.pagebuffer) # must persist
gc = GraphicsContext.Create(self.pdc) # Cairo/wx.GraphicsContext API
# white background
path = gc.CreatePath()
path.AddRectangle(0, 0, self.pagebuffer.GetWidth(), self.pagebuffer.GetHeight())
gc.SetBrush(wx.WHITE_BRUSH)
gc.FillPath(path)
for pageno in range(self.frompage, self.topage+1):
self.xpageoffset = 0 - self.x0
self.ypageoffset = pageno*self.Ypagepixels - self.page_y0
if pageno in self.cachedpages:
self.pdc.Blit(self.xpageoffset, self.ypageoffset,
self.Xpagepixels, self.Ypagepixels,
self.cachedpages[pageno], 0, 0)
else:
t1 = time.time()
gc.PushState()
gc.Translate(0 - self.x0, pageno*self.Ypagepixels +
self.pageheight*self.scale - self.page_y0)
gc.Scale(self.scale, self.scale)
self.RenderPage(gc, self.pagedrawings[pageno])
# Show inter-page gap
gc.SetBrush(wx.Brush(wx.Colour(180, 180, 180))) #mid grey
gc.SetPen(wx.TRANSPARENT_PEN)
gc.DrawRectangle(0, 0, self.pagewidth, self.page_gap)
gc.PopState()
ttr = time.time()-t1
if CACHE_LATE_PAGES and ttr * 1000 > LATE_THRESHOLD:
self.CachePage(pageno) # save page out of buffer
#print('Page %d rendered in %.3f seconds' % (pageno+1, ttr))
gc.PushState()
gc.Translate(0-self.x0, 0-self.page_y0)
self.RenderPageBoundaries(gc)
gc.PopState()
self.Refresh(0) # Blit appropriate area of new or existing page buffer to screen
#print('Cached pages:', self.cachedpages.keys())
#self.pagebuffer.SaveFile('pagemap.png', wx.BITMAP_TYPE_PNG)
def RenderPage(self, gc, pagedrawings):
"""
Render the set of pagedrawings
In a pdf file, bitmaps are treated as being of unit width and height and
are scaled via a previous ConcatTransform containing the corresponding width
and height as scale factors. wx.GraphicsContext/Cairo appear not to respond to
this so scaling is removed from transform and width & height are added
to the Drawbitmap call.
"""
drawdict = {'ConcatTransform': gc.ConcatTransform,
'PushState': gc.PushState,
'PopState': gc.PopState,
'SetFont': gc.SetFont,
'SetPen': gc.SetPen,
'SetBrush': gc.SetBrush,
'DrawText': gc.DrawText,
'DrawBitmap': gc.DrawBitmap,
'CreatePath': gc.CreatePath,
'DrawPath': gc.DrawPath }
for drawcmd, args, kwargs in pagedrawings:
if drawcmd == 'ConcatTransform':
cm = gc.CreateMatrix(*args, **kwargs)
args = (cm,)
if drawcmd == 'CreatePath':
gp = drawdict[drawcmd](*args, **kwargs)
continue
elif drawcmd == 'DrawPath':
args = (gp, args[1])
if drawcmd in drawdict:
drawdict[drawcmd](*args, **kwargs)
else:
pathdict = {'MoveToPoint': gp.MoveToPoint,
'AddLineToPoint': gp.AddLineToPoint,
'AddCurveToPoint': gp.AddCurveToPoint,
'AddRectangle': gp.AddRectangle,
'CloseSubpath': gp.CloseSubpath }
if drawcmd in pathdict:
pathdict[drawcmd](*args, **kwargs)
def RenderPageBoundaries(self, gc):
"""
Show non-page areas in grey.
"""
gc.SetBrush(wx.Brush(wx.Colour(180, 180, 180))) #mid grey
gc.SetPen(wx.TRANSPARENT_PEN)
gc.Scale(1.0, 1.0)
extrawidth = self.winwidth - self.Xpagepixels
if extrawidth > 0:
gc.DrawRectangle(self.winwidth-extrawidth, 0, extrawidth, self.maxheight)
extraheight = self.winheight - (self.numpages*self.Ypagepixels - self.y0)
if extraheight > 0:
gc.DrawRectangle(0, self.winheight-extraheight, self.maxwidth, extraheight)
def CachePage(self, pageno):
"""
When page takes a 'long' time to render, save its contents out of
self.pdc and re-use it to minimise jerky scrolling.
"""
cachebuffer = wx.Bitmap(self.Xpagepixels, self.Ypagepixels)
cdc = wx.MemoryDC(cachebuffer)
cdc.Blit(0, 0, self.Xpagepixels, self.Ypagepixels,
self.pdc, self.xpageoffset, self.ypageoffset)
self.cachedpages[pageno] = cdc
#----------------------------------------------------------------------------
"These methods interpret the PDF contents as a set of drawing commands"
def Progress(self, ptype, value):
"""
This function is called at regular intervals during Drawfile.
"""
if ptype == 'start':
msg = 'Reading pdf file'
self.progbar = wx.ProgressDialog('Load file', msg, value, None,
wx.PD_AUTO_HIDE|
wx.PD_ESTIMATED_TIME|wx.PD_REMAINING_TIME)
elif ptype == 'progress':
self.progbar.Update(value)
elif ptype == 'end':
self.progbar.Destroy()
def DrawFile(self, frompage, topage):
"""
Build set of drawing commands from PDF contents. Ideally these could be drawn
straight into a PseudoDC and the visible section painted directly into
scrolled window, but we need to be able to zoom and scale the output quickly
without having to rebuild the drawing commands (slow). So roll our
own command lists, one per page, into self.pagedrawings.
"""
t0 = time.time()
numpages_generated = 0
rp = (self.ShowLoadProgress and frompage == 0 and topage == self.numpages-1)
if rp: self.Progress('start', self.numpages)
for self.pageno in range(frompage, topage+1):
self.gstate = pdfState() # state is reset with every new page
self.saved_state = []
self.page = self.pdfdoc.getPage(self.pageno)
numpages_generated += 1
pdf_fonts = self.FetchFonts(self.page)
self.pagedrawings[self.pageno] = self.ProcessOperators(
self.page.extractOperators(), pdf_fonts)
if rp: self.Progress('progress', numpages_generated)
## print('Pages %d to %d. %d pages created in %.2f seconds' % (
## frompage, topage, numpages_generated,(time.time()-t0)))
if rp: self.Progress('end', None)
self.GoPage(frompage)
def FetchFonts(self, currentobject):
"""
Return the standard fonts in current page or form.
"""
pdf_fonts = {}
fonts = currentobject["/Resources"].getObject()['/Font']
for key in fonts:
pdf_fonts[key] = fonts[key]['/BaseFont'][1:] # remove the leading '/'
return pdf_fonts
def ProcessOperators(self, opslist, pdf_fonts):
"""
Interpret each operation in opslist and return in drawlist.
"""
drawlist = []
path = []
for operand, operator in opslist :
g = self.gstate
if operator == 'cm': # new transformation matrix
# some operands need inverting because directions of y axis
# in pdf and graphics context are opposite
a, b, c, d, e, f = map(float, operand)
drawlist.append(['ConcatTransform', (a, -b, -c, d, e, -f), {}])
elif operator == 'q': # save state
self.saved_state.append(copy.deepcopy(g))
drawlist.append(['PushState', (), {}])
elif operator == 'Q': # restore state
self.gstate = self.saved_state.pop()
drawlist.append(['PopState', (), {}])
elif operator == 'RG': # Stroke RGB
rs, gs, bs = [int(v*255) for v in map(float, operand)]
g.strokeRGB = wx.Colour(rs, gs, bs)
elif operator == 'rg': # Fill RGB
rf, gf, bf = [int(v*255) for v in map(float, operand)]
g.fillRGB = wx.Colour(rf, gf, bf)
elif operator == 'K': # Stroke CMYK
rs, gs, bs = self.ConvertCMYK(operand)
g.strokeRGB = wx.Colour(rs, gs, bs)
elif operator == 'k': # Fill CMYK
rf, gf, bf = self.ConvertCMYK(operand)
g.fillRGB = wx.Colour(rf, gf, bf)
elif operator == 'w': # Line width
g.lineWidth = float(operand[0])
elif operator == 'J': # Line cap
ix = float(operand[0])
g.lineCapStyle = {0: wx.CAP_BUTT, 1: wx.CAP_ROUND,
2: wx.CAP_PROJECTING}[ix]
elif operator == 'j': # Line join
ix = float(operand[0])
g.lineJoinStyle = {0: wx.JOIN_MITER, 1: wx.JOIN_ROUND,
2: wx.JOIN_BEVEL}[ix]
elif operator == 'd': # Line dash pattern
g.lineDashArray = map(int, operand[0])
g.lineDashPhase = int(operand[1])
elif operator in ('m', 'c', 'l', 're', 'v', 'y', 'h'): # path defining ops
path.append([map(float, operand), operator])
elif operator in ('b', 'B', 'b*', 'B*', 'f', 'F', 'f*',
's', 'S', 'n'): # path drawing ops
drawlist.extend(self.DrawPath(path, operator))
path = []
elif operator == 'BT': # begin text object
g.textMatrix = [1, 0, 0, 1, 0, 0]
g.textLineMatrix = [1, 0, 0, 1, 0, 0]
elif operator == 'ET': # end text object
continue
elif operator == 'Tm': # text matrix
g.textMatrix = map(float, operand)
g.textLineMatrix = map(float, operand)
elif operator == 'TL': # text leading
g.leading = float(operand[0])
#elif operator == 'Tc': # character spacing
# g.charSpacing = float(operand[0])
elif operator == 'Tw': # word spacing
g.wordSpacing = float(operand[0])
elif operator == 'Ts': # super/subscript
g.textRise = float(operand[0])
elif operator == 'Td': # next line via offsets
g.textLineMatrix[4] += float(operand[0])
g.textLineMatrix[5] += float(operand[1])
g.textMatrix = copy.copy(g.textLineMatrix)
elif operator == 'T*': # next line via leading
g.textLineMatrix[4] += 0
g.textLineMatrix[5] -= g.leading if g.leading is not None else 0
g.textMatrix = copy.copy(g.textLineMatrix)
elif operator == 'Tf': # text font
g.font = pdf_fonts[operand[0]]
g.fontSize = float(operand[1])
elif operator == 'Tj': # show text
drawlist.extend(self.DrawTextString(operand[0]))
elif operator == 'Do': # invoke named XObject
drawlist.extend(self.InsertXObject(operand[0]))
elif operator == 'INLINE IMAGE': # special pyPdf case + operand is a dict
drawlist.extend(self.InlineImage(operand))
else: # report once
if operator not in self.unimplemented:
if VERBOSE: print('PDF operator %s is not implemented' % operator)
self.unimplemented[operator] = 1
# Fix bitmap transform. Remove the scaling from any transform matrix that precedes
# a DrawBitmap operation as the scaling is now done in that operation.
for k in range(len(drawlist)-1):
if drawlist[k][0] == 'ConcatTransform' and drawlist[k+1][0] == 'DrawBitmap':
args = list(drawlist[k][1])
args[0] = 1.0
args[3] = 1.0
drawlist[k][1] = tuple(args)
return drawlist
def SetFont(self, pdfont, size):
"""
Returns :class:`Font` instance from supplied pdf font information.
"""
self.knownfont = True
pdfont = pdfont.lower()
if pdfont.count('courier'):
family = wx.FONTFAMILY_MODERN
font = 'Courier New'
elif pdfont.count('helvetica'):
family = wx.FONTFAMILY_SWISS
font = 'Arial'
elif pdfont.count('times'):
family = wx.FONTFAMILY_ROMAN
font = 'Times New Roman'
elif pdfont.count('symbol'):
family = wx.FONTFAMILY_DEFAULT
font = 'Symbol'
elif pdfont.count('zapfdingbats'):
family = wx.FONTFAMILY_DEFAULT
font = 'Wingdings'
else:
if VERBOSE: print('Unknown font %s' % pdfont)
self.knownfont = False
family = wx.FONTFAMILY_SWISS
font = 'Arial'
weight = wx.FONTWEIGHT_NORMAL
if pdfont.count('bold'):
weight = wx.FONTWEIGHT_BOLD
style = wx.FONTSTYLE_NORMAL
if pdfont.count('oblique') or pdfont.count('italic'):
style = wx.FONTSTYLE_ITALIC
return wx.Font(max(1,size), family, style, weight, faceName=font)
def DrawTextString(self, text):
"""
Draw a text string. Word spacing only works for horizontal text.
:param string `text`: the text to draw
"""
dlist = []
g = self.gstate
f = self.SetFont(g.font, g.fontSize*FONTSCALE)
dlist.append(['SetFont', (f, g.fillRGB), {}])
if g.wordSpacing > 0:
textlist = text.split(' ')
else:
textlist = [text,]
for item in textlist:
dlist.append(self.DrawTextItem(item, f))
return dlist
def DrawTextItem(self, textitem, f):
"""
Draw a text item.
:param `textitem`: the item to draw ??? what is the type
:param `f`: the font to use for text extent measuring ???
"""
dc = wx.ClientDC(self) # dummy dc for text extents
g = self.gstate
x = g.textMatrix[4]
y = g.textMatrix[5] + g.textRise
if g.wordSpacing > 0:
textitem += ' '
wid, ht, descend, xlead = dc.GetFullTextExtent(textitem, f)
if have_rlwidth and self.knownfont: # use ReportLab stringWidth if available
width = stringWidth(textitem, g.font, g.fontSize)
else:
width = wid/self.device_scale
g.textMatrix[4] += (width + g.wordSpacing) # update current x position
return ['DrawText', (textitem, x, -y-(ht-descend)/self.device_scale), {}]
def DrawPath(self, path, action):
"""
Stroke and/or fill the defined path depending on operator.
"""
dlist = []
g = self.gstate
acts = {'S': (1, 0, 0),
's': (1, 0, 0),
'f': (0, 1, wx.WINDING_RULE),
'F': (0, 1, wx.WINDING_RULE),
'f*': (0, 1, wx.ODDEVEN_RULE),
'B': (1, 1, wx.WINDING_RULE),
'B*': (1, 1, wx.ODDEVEN_RULE),
'b': (1, 1, wx.WINDING_RULE),
'b*': (1, 1, wx.ODDEVEN_RULE),
'n': (0, 0, 0) }
stroke, fill, rule = acts[action]
if action in ('s', 'b', 'b*'):
path.append([[], 'h']) # close path
if stroke:
if g.lineDashArray:
style = wx.PENSTYLE_USER_DASH
else:
style = wx.PENSTYLE_SOLID
cpen = wx.Pen(g.strokeRGB, g.lineWidth, style)
cpen.SetCap(g.lineCapStyle)
cpen.SetJoin(g.lineJoinStyle)
if g.lineDashArray:
cpen.SetDashes(g.lineDashArray)
dlist.append(['SetPen', (cpen,), {}])
else:
dlist.append(['SetPen', (wx.TRANSPARENT_PEN,), {}])
if fill:
dlist.append(['SetBrush', (wx.Brush(g.fillRGB),), {}])
else:
dlist.append(['SetBrush', (wx.TRANSPARENT_BRUSH,), {}])
dlist.append(['CreatePath', (), {}])
for xylist, op in path:
if op == 'm': # move (to) current point
x0 = xc = xylist[0]
y0 = yc = -xylist[1]
dlist.append(['MoveToPoint', (x0, y0), {}])
elif op == 'l': # draw line
x2 = xylist[0]
y2 = -xylist[1]
dlist.append(['AddLineToPoint', (x2, y2), {}])
xc = x2
yc = y2
elif op == 're': # draw rectangle (x,y at top left)
x = xylist[0]
y = -xylist[1]
w = xylist[2]
h = xylist[3]
dlist.append(['AddRectangle', (x, y-h, w, h), {}])
elif op in ('c', 'v', 'y'): # draw Bezier curve
args = []
if op == 'v':
args.extend([xc, yc])
args.extend([xylist[0], -xylist[1],
xylist[2], -xylist[3]])
if op == 'y':
args.extend([xylist[2], -xylist[3]])
if op == 'c':
args.extend([xylist[4], -xylist[5]])
dlist.append(['AddCurveToPoint', args, {}])
elif op == 'h':
dlist.append(['CloseSubpath', (), {}])
dlist.append(['DrawPath', ('GraphicsPath', rule), {}])
return dlist
def InsertXObject(self, name):
"""
XObject can be an image or a 'form' (an arbitrary PDF sequence).
"""
dlist = []
xobject = self.page["/Resources"].getObject()['/XObject']
stream = xobject[name]
if stream.get('/Subtype') == '/Form':
# insert contents into current page drawing
if not name in self.formdrawings: # extract if not already done
pdf_fonts = self.FetchFonts(stream)
bbox = stream.get('/BBox')
matrix = stream.get('/Matrix')
form_ops = ContentStream(stream, self.pdfdoc).operations
oplist = [([], 'q'), (matrix, 'cm')] # push state & apply matrix
oplist.extend(form_ops) # add form contents
oplist.append(([], 'Q')) # restore original state
self.formdrawings[name] = self.ProcessOperators(oplist, pdf_fonts)
dlist.extend(self.formdrawings[name])
elif stream.get('/Subtype') == '/Image':
width = stream.get('/Width')
height = stream.get('/Height')
depth = stream.get('/BitsPerComponent')
filters = stream.get("/Filter", ())
dlist.append(self.AddBitmap(stream._data, width, height, filters))
return dlist
def InlineImage(self, operand):
"""
Operand contains an image.
"""
dlist = []
data = operand.get('data')
settings = operand.get('settings')
width = settings['/W']
height = settings['/H']
depth = settings['/BPC']
filters = settings['/F']
dlist.append(self.AddBitmap(data, width, height, filters))
return dlist
def AddBitmap(self, data, width, height, filters):
"""
Add wx.Bitmap from data, processed by filters.
"""
if '/A85' in filters or '/ASCII85Decode' in filters:
data = _AsciiBase85DecodePYTHON(data)
if '/Fl' in filters or '/FlateDecode' in filters:
data = FlateDecode.decode(data, None)
if '/DCT' in filters or '/DCTDecode' in filters:
stream = BytesIO(data)
image = wx.Image(stream, wx.BITMAP_TYPE_JPEG)
bitmap = wx.Bitmap(image)
else:
bitmap = wx.BitmapFromBuffer(width, height, data)
return ['DrawBitmap', (bitmap, 0, 0-height, width, height), {}]
def ConvertCMYK(self, operand):
"""
Convert CMYK values (0 to 1.0) in operand to nearest RGB.
"""
c, m, y, k = operand
r = round((1-c)*(1-k)*255)
b = round((1-y)*(1-k)*255)
g = round((1-m)*(1-k)*255)
return (r, g, b)
@property
def ShowLoadProgress(self):
"""
Property to control if loading progress be shown.
"""
return self._showLoadProgress
@ShowLoadProgress.setter
def ShowLoadProgress(self, flag):
"""
Setter for showLoadProgress.
"""
self._showLoadProgress = flag
@property
def UsePrintDirect(self):
"""
Property to control to use either Cairo (via a page buffer) or
dcGraphicsContext.
"""
return self._usePrintDirect
@UsePrintDirect.setter
def UsePrintDirect(self, flag):
"""
Setter for usePrintDirect.
"""
self._usePrintDirect = flag
#----------------------------------------------------------------------------
class pdfState:
"""
Instance holds the current pdf graphics and text state. It can be
saved (pushed) and restored (popped) by the owning parent.
"""
def __init__ (self):
"""
Creates an instance with default values. Individual attributes
are modified directly not via getters and setters.
"""
self.lineWidth = 1.0
self.lineCapStyle = wx.CAP_BUTT
self.lineJoinStyle = wx.JOIN_MITER
self.lineDashArray = []
self.lineDashPhase = 0
self.miterLimit = None
self.strokeRGB = wx.Colour(0, 0, 0)
self.fillRGB = wx.Colour(0, 0, 0) # used for both shapes & text
self.fillMode = None
self.textMatrix = [1, 0, 0, 1, 0, 0]
self.textLineMatrix = [1, 0, 0, 1, 0, 0]
self.charSpacing = 0
self.wordSpacing = 0
self.horizontalScaling = None
self.leading = None
self.font = None
self.fontSize = None
self.textRenderMode = None
self.textRise = 0
#------------------------------------------------------------------------------
class pdfPrintout(wx.Printout):
"""
Class encapsulating the functionality of printing out the document. The methods below
over-ride those of the base class and supply document-specific information to the
printing framework that calls them internally.
"""
def __init__(self, title, view):
"""
Pass in the instance of dpViewer to be printed.
"""
wx.Printout.__init__(self, title)
self.view = view
def HasPage(self, pageno):
"""
Report whether pageno exists.
"""
if pageno <= self.view.numpages:
return True
else:
return False
def GetPageInfo(self):
"""
Supply maximum range of pages and the range to be printed
These are initial values passed to Printer dialog, where they
can be amended by user.
"""
max = self.view.numpages
return (1, max, 1, max)
def OnPrintPage(self, page):
"""
Provide the data for page by rendering the drawing commands
to the printer DC using either Cairo (via a page buffer) or
dcGraphicsContext depending on the self.view.usePrintDirect property.
"""
if self.view.UsePrintDirect:
self.PrintDirect(page)
else:
self.PrintViaBuffer(page)
return True
def PrintDirect(self, page):
"""
Provide the data for page by rendering the drawing commands
to the printer DC using :class:`~lib.pdfviewer.dcgraphics.dcGraphicsContext`.
"""
pageno = page - 1 # zero based
width = self.view.pagewidth
height = self.view.pageheight
self.FitThisSizeToPage(wx.Size(width, height))
dc = self.GetDC()
gc = dcGraphicsContext.Create(dc, height, have_cairo)
self.view.RenderPage(gc, self.view.pagedrawings[pageno])
def PrintViaBuffer(self, page):
"""
Provide the data for page by drawing it as a bitmap to the printer DC
sfac needs to provide a high enough resolution bitmap for printing that
reduces anti-aliasing blur but be kept small to minimise printing time .
"""
sfac = 6.0
pageno = page - 1 # zero based
dc = self.GetDC()
width = self.view.pagewidth*sfac
height = self.view.pageheight*sfac
self.FitThisSizeToPage(wx.Size(width, height))
# Initialize the buffer bitmap.
buffer = wx.Bitmap(width, height)
mdc = wx.MemoryDC(buffer)
gc = GraphicsContext.Create(mdc)
# white background
path = gc.CreatePath()
path.AddRectangle(0, 0, width, height)
gc.SetBrush(wx.WHITE_BRUSH)
gc.FillPath(path)
gc.Translate(0, height)
gc.Scale(sfac, sfac)
self.view.RenderPage(gc, self.view.pagedrawings[pageno])
dc.DrawBitmap(buffer, 0, 0)
#------------------------------------------------------------------------------
"""
The following has been "borrowed" from from reportlab.pdfbase.pdfutils,
where it is used for testing, because the equivalent function in pyPdf
fails when attempting to decode an embedded JPEG image.
"""
def _AsciiBase85DecodePYTHON(input):
"""
Decodes input using ASCII-Base85 coding.
This is not used - Acrobat Reader decodes for you
- but a round trip is essential for testing.
"""
#strip all whitespace
stripped = ''.join(input.split())
#check end
assert stripped[-2:] == '~>', 'Invalid terminator for Ascii Base 85 Stream'
stripped = stripped[:-2] #chop off terminator
#may have 'z' in it which complicates matters - expand them
stripped = stripped.replace('z','!!!!!')
# special rules apply if not a multiple of five bytes.
whole_word_count, remainder_size = divmod(len(stripped), 5)
#print('%d words, %d leftover' % (whole_word_count, remainder_size))
#assert remainder_size != 1, 'invalid Ascii 85 stream!'
cut = 5 * whole_word_count
body, lastbit = stripped[0:cut], stripped[cut:]
out = [].append
for i in xrange(whole_word_count):
offset = i*5
c1 = ord(body[offset]) - 33
c2 = ord(body[offset+1]) - 33
c3 = ord(body[offset+2]) - 33
c4 = ord(body[offset+3]) - 33
c5 = ord(body[offset+4]) - 33
num = ((85**4) * c1) + ((85**3) * c2) + ((85**2) * c3) + (85*c4) + c5
temp, b4 = divmod(num,256)
temp, b3 = divmod(temp,256)
b1, b2 = divmod(temp, 256)
assert num == 16777216 * b1 + 65536 * b2 + 256 * b3 + b4, 'dodgy code!'
out(chr(b1))
out(chr(b2))
out(chr(b3))
out(chr(b4))
#decode however many bytes we have as usual
if remainder_size > 0:
while len(lastbit) < 5:
lastbit = lastbit + '!'
c1 = ord(lastbit[0]) - 33
c2 = ord(lastbit[1]) - 33
c3 = ord(lastbit[2]) - 33
c4 = ord(lastbit[3]) - 33
c5 = ord(lastbit[4]) - 33
num = (((85*c1+c2)*85+c3)*85+c4)*85 + (c5
+(0,0,0xFFFFFF,0xFFFF,0xFF)[remainder_size])
temp, b4 = divmod(num,256)
temp, b3 = divmod(temp,256)
b1, b2 = divmod(temp, 256)
assert num == 16777216 * b1 + 65536 * b2 + 256 * b3 + b4, 'dodgy code!'
#print('decoding: %d %d %d %d %d -> %d -> %d %d %d %d' % (
# c1,c2,c3,c4,c5,num,b1,b2,b3,b4))
#the last character needs 1 adding; the encoding loses
#data by rounding the number to x bytes, and when
#divided repeatedly we get one less
if remainder_size == 2:
lastword = chr(b1)
elif remainder_size == 3:
lastword = chr(b1) + chr(b2)
elif remainder_size == 4:
lastword = chr(b1) + chr(b2) + chr(b3)
else:
lastword = ''
out(lastword)
#terminator code for ascii 85
return ''.join(out.__self__)
Reference in a new issue View git blame Copy permalink