While Acrobat can display plain-text pages OK, it slows for images, and slow as you scroll between pages.
My program uses a PDF-to-BMP converter, so I avoided the impossible task of dealing directly with the PDF format. (Unfortunately the demo of this program puts a watermark on every page.)
It loads the bitmaps into a FBGFX screen, and has separate threads for displaying and loading, so it shouldn't seem slow at all, although it takes 1-2 seconds for each page to load.
I was experimenting with some scrolling options: if you move the mouse to the left side of the screen, you can scroll just by moving the mouse vertically. Maybe it's not practical, but it's interesting.
Of course using BMP files to load pages is inefficient, loading all the pages into memory at once is not practical for some computers, this assumes all pages are a certain size (8.5" * 11", portrait), and many features such as zooming aren't implemented, but this program has smooth scrolling! :P
Code: Select all
' PDFViewer! v1.0
' (C) 2009 Kristopher Windsor and Innova
#Include "windows.bi"
#include once "fbgfx.bi"
Function RunProc(filename As String, params As String = "", workdir As String = "") As PROCESS_INFORMATION
Dim si As STARTUPINFO, pi As PROCESS_INFORMATION
si.cb = Sizeof(STARTUPINFO)
Dim wd As Zstring Ptr
If Len(workdir) Then wd = Strptr(workdir)
Var cl = """" & filename & """ " & params
CreateProcess(Strptr(filename), Strptr(cl), NULL, NULL, FALSE, 0, NULL, wd, @si, @pi)
Return pi
End Function
Function IsProcRunning(pi As PROCESS_INFORMATION) As Boolean
Dim exitcode As Integer
GetExitCodeProcess(pi.hProcess, @exitcode)
Return (exitcode = STILL_ACTIVE)
End Function
Const page_max = 512, page_x = 1024, page_y = 1500, scroll_x = 96
Dim Shared As Integer screen_x, screen_y
Dim Shared As Integer page_loadprogress(1 To page_max) '0 = not loaded, 1 = loading, 2 = done, 3 = error (does not exist)
Dim Shared As String file
Dim Shared As fb.image Ptr page(1 To page_max)
Dim Shared As Any Ptr mutex
Sub load (Byval nada As Any Ptr = 0)
Dim As PROCESS_INFORMATION process
Dim As Integer newpage
Dim As String pagefile
Dim As fb.image Ptr graphic
Do
'find a page to load
Mutexlock(mutex)
newpage = 0
For i As Integer = 1 To page_max
If page_loadprogress(i) = 0 Then newpage = i: page_loadprogress(i) = 1: Exit For
Next i
Mutexunlock(mutex)
If newpage = 0 Then Return
pagefile = "page" & newpage & ".bmp"
'make page
Kill(pagefile)
process = runProc("PDFtoBMP.exe", "-i """ & file & """ -o ./page" & newpage & ".bmp -b 24 -r 120 -f " & newpage & " -l " & newpage)
'load page
graphic = imagecreate(page_x, page_y)
While isProcRunning(process): Sleep(300, 1): Wend
If Bload(pagefile, graphic) Then
Mutexlock(mutex)
page_loadprogress(newpage) = 3
Mutexunlock(mutex)
imagedestroy(graphic)
Return
End If
'publish page
Mutexlock(mutex)
page_loadprogress(newpage) = 2
page(newpage) = graphic
Mutexunlock(mutex)
Loop
End Sub
Sub start ()
file = Command()
'If file = "" Then file = "./part1.pdf" 'for testing
Chdir(Exepath())
Screeninfo(screen_x, screen_y)
Screenres screen_x, screen_y, 32,, fb.GFX_NO_FRAME Or fb.GFX_ALPHA_PRIMITIVES
If file = "" Then Print "No file specified!": Sleep(): System()
var t = Threadcreate(@load())
End Sub
Sub main ()
Dim As Integer mx, my, ms, mb, pmx, pmy, pms, pmb
Dim As Integer page_total, complete
Dim As Double y, yv, yvv, document_y
Dim As String s
Do
document_y += (page_total * page_y - document_y) * .1
If complete = 0 Then
Mutexlock(mutex)
If page_loadprogress(page_total + 1) = 2 Then page_total += 1
If page_total = page_max orelse page_loadprogress(page_total + 1) = 3 Then complete = 1
Mutexunlock(mutex)
End If
pmx = mx: pmy = my: pms = ms: pmb = mb
If Getmouse(mx, my, ms, mb) Then mb = 0
yvv += (pms - ms) * 15
'left bar: scroll without dragging
If mx < scroll_x Then
yvv += (my - pmy) * .3
End If
'right bar: drag scrollbar (no gliding)
If mx > screen_x - scroll_x Then
If (mb > 0 And pmb > 0) Then
y = (my -scroll_x \ 2) * (document_y - screen_y) / (screen_y - scroll_x)
yv = 0
yvv = 0
End If
End If
If (Multikey(fb.sc_down)) Then yvv += 1
If (Multikey(fb.sc_up)) Then yvv -= 1
If (Multikey(fb.sc_pagedown)) Then yvv += 10
If (Multikey(fb.sc_pageup)) Then yvv -= 10
yv += yvv
y += yv
yv *= .9
yvv *= .9
If y + screen_y > document_y Then y = document_y - screen_y: yv = 0: yvv = 0
If y < 0 Then y = 0: yv = 0: yvv = 0
Screenlock()
Line (0, 0) - ((screen_x - page_x) \ 2, screen_y), &H22000000, BF
Line -Step(page_x, -screen_y), &HFFFFFFFF, BF
Line Step(0, 0) - (screen_x, screen_y), &H22000000, BF
Mutexlock(mutex)
For i As Integer = 1 To page_total
Put ((screen_x - page_x) \ 2, (i - 1) * page_y - y), page(i), trans
Next i
Mutexunlock(mutex)
s = Cint(yv) & "x"
If complete = 0 Then s += " ..."
Draw String (scroll_x \ 2 - 4 * Len(s), 3), s, &HFFFFFFFF
s = Cint(y / page_y + 1) & " / " & page_total
Circle (screen_x - scroll_x \ 2, Iif(page_total > 0, (screen_y - scroll_x) * y / (document_y - screen_y), 0#) + scroll_x \ 2), _
scroll_x \ 2, &HFFFFFFFF,,, 1, F
Circle Step(0, 0), scroll_x \ 2, &HFF000000,,, 1
Draw String Step(-4 * Len(s), 0), s, &HFF000000
Screenunlock()
Sleep(15, 1)
Loop Until Inkey = Chr(27)
End Sub
mutex = Mutexcreate()
start()
main()
Mutexdestroy(mutex)http://jafile.com/uploads/kristopherwin ... viewer.zip
A PDF file, in case you don't have one:
http://incubator.apache.org/thrift/stat ... 070401.pdf