OpenEuphoria

Re: Bitmap clearing

• Posted by jordah at btopenworld.com Jan 30, 2003
• 389 views

hi Patrick,
    Oops, that's my mistake sorry about that. My routines were a bit doggy
too. I hope that didn't give you much of a head-ache. "Smallest and easiest
bugs to fix, are the hardest to find" Sir LoJiK 2002

Jordah
----- Original Message -----
From: <Patrick.Barnes at transgrid.com.au>
To: "EUforum" <EUforum at topica.com>
Subject: RE: Bitmap clearing


>
> Hey Jordah...
> I found an error in your PatBLT procedure... I didn't notice until now,
because some of the pixmap wasn't clearing correctly, and I couldn't figure
out why:
>
> >-------------------------------------------
> >procedure PatBlt(atom hdc,atom x,atom y,atom cx,atom cy,atom rop)
> >-------------------------------------------
> >   if not w32Func(zPatBlt,{hdc,x,y,cy,cy,rop}) then
> >      warnErr("PatBlt Failed")      \-------perhaps that should be cx?
> >   end if
> >end procedure
>
> Very frustrating, I tore my program almost to pieces looking for the bug,
and it was your fault all along! :oP
>
> Hopefully you don't have that same error sitting somewhere.
>
> Thanks for the demo. VERY useful.
>
> -Pat
>
> -----Original Message-----
> From: jordah at btopenworld.com [mailto:jordah at btopenworld.com]
> Sent: Saturday, 25 January 2003 15:49
> To: EUforum
> Subject: Re: Bitmap clearing
>
>
> Hi Patrick,
>
>     I alittle bit under-estimated win32lib. It does alot of work for the
> end-user. Its getDC has a very kewl construct. also, i have attached
> BlankPixmap() which is a faster way to blank a pixmap.
>
> Try this demo in  the win32lib directory because it requires mail.bmp
>
> Hope this helps.
> Jordah.
>
> ---------------------------------------------------------
> --File   : Demo For Patrick
> --Version:
> --Date   :
> --Author : Jordah Ferguson
> ---------------------------------------------------------
>
> include win32lib.ew
> -------------------------------------------
>
> constant
>   MainWindow = create(Window,"Demo for
> Patrick",0,Default,Default,600,400,0),
>   Pixmap1    = create(Pixmap,"",0,0,0,300,300,0),
>   zPatBlt    =
>
registerw32Function(gdi32,"PatBlt",{C_LONG,C_LONG,C_INT,C_INT,C_INT,C_INT},C
> _INT),
>   -------------------------------------------
>   Bitmap1    = loadBitmapFromFile(current_dir()&"\\mail.bmp")
>
> -------------------------------------------
> procedure PatBlt(atom hdc,atom x,atom y,atom cx,atom cy,atom rop)
> -------------------------------------------
>    if not w32Func(zPatBlt,{hdc,x,y,cy,cy,rop}) then
>       warnErr("PatBlt Failed")
>    end if
> end procedure
>
> -------------------------------------------
> global procedure stretchBlt( atom dst, integer dstX, integer dstY,
>       atom src, integer srcX, integer srcY,
>       integer destWide, integer destHigh,
>       integer srcWide, integer srcHigh,
>       integer rop )
> -------------------------------------------
>     atom srcDC, dstDC
>     srcDC = getDC( src )
>     dstDC = getDC( dst )
>     if not w32Func( xStretchBlt, {
>       dstDC, dstX, dstY,
>       destWide, destHigh,
>       srcDC,
>       srcX, srcY,
>       srcWide, srcHigh,
>       rop} ) then
>       warnErr( "stretchBlt:StretchBlt failed." )
>     end if
>     releaseDC( dst )
>     releaseDC( src )
> end procedure
>
> -------------------------------------------
> procedure BlankPixmap(integer Pixmap,atom BkColor)
> -------------------------------------------
>    atom hdc,brush,oldbrush
>    sequence rect
>    rect = getRect(Pixmap)
>    hdc = getDC(Pixmap) -- This already performs selectobject()
>    brush = w32Func(xCreateSolidBrush,{BkColor})
>    oldbrush = w32Func(xSelectObject,{hdc,brush})
>    PatBlt(hdc,rect[1],rect[2],rect[3],rect[4],#00F00021)
>    oldbrush = w32Func(xSelectObject,{hdc,oldbrush})
>    oldbrush = w32Func(xDeleteObject,{brush})
>    releaseDC(hdc)
> end procedure
>
>
> -------------------------------------------
> procedure DrawToPixmap(integer Pix,atom hBmp,atom px,atom py,atom
bitcx,atom
> bitcy)
> -------------------------------------------
>    sequence rect
>    rect = getRect(hBmp)
>    stretchBlt(Pix,px,py,hBmp,0,0,bitcx,bitcy,rect[3],rect[4],SRCCOPY)
> end procedure
>
> -------------------------------------------
> procedure DrawToScreen(integer dest,integer Pix,atom x,atom y,atom cx,atom
> cy)
> -------------------------------------------
>    sequence rect
>    rect = getRect(Pix)
>    stretchBlt(dest,x,y,Pix,0,0,cx,cy,rect[3],rect[4],SRCCOPY)
> end procedure
>
> -------------------------------------------
> procedure onPaint_Proc(integer id,integer event,sequence params)
> -------------------------------------------
>    sequence rect,rec,re
>    re   = getClientRect(MainWindow)
>    rect = getRect(Pixmap1)
>    rec  = getRect(Bitmap1)
>    BlankPixmap(Pixmap1,White)
>
>
DrawToPixmap(Pixmap1,Bitmap1,floor((rect[3]-rec[3])/2)-40,floor((rect[4]-rec
> [4])/2)-40,rec[3]+40,rec[4]+40)
>    DrawToScreen(MainWindow,Pixmap1,re[1],re[2],re[3],re[4])
> end procedure
> setHandler(MainWindow,w32HPaint,routine_id("onPaint_Proc"))
>
> -------------------------------------------
> procedure onResize_Proc(integer id,integer event,sequence params)
> -------------------------------------------
>    DrawToScreen(MainWindow,Pixmap1,0,0,params[2],params[3])
> end procedure
> setHandler(MainWindow,w32HResize,routine_id("onResize_Proc"))
>
>
> -------------------------------------------
> WinMain(MainWindow,Normal)
>
>
> ---
>
>
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>
>
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