Re: Multi-Thread HDC and video display

Article View: borland.public.cppbuilder.nativeapi

Article #2322

Back to borland.public.cppbuilder.nativeapi Previous Next

#2322

From: Jonathan Benedicto
Date: Mon, 12 Mar 2007 20:15

31 lines
2404 bytes

Robert G. Hoover wrote:
> Sorry this had morphed into a video app discussion....

No problem. I've done work with multi-threading video applications, so I'm 
somewhat familiar with it :-)

> I commented out the Display() routine and there is no noticeable lag. :) 
> But,
> now how do I display my video without using
> SendDIBitsToDevice(ShellForm->Handle)? I use GetDC to get the DC of the 
> window
> instead of using ShellForm->Canvas->Handle. Can I get the handle to the 
> window
> in such a way that gets around the TApplication like this? This Display()
> function is just for quick splashing of video, meant to be as fast as 
> possible.
> That's why I'm calling low-level Win32 API call SendDIBitsToDevice instead 
> of
> using something like ShellForm->Canvas->Draw(0, 0, MyTBitmap). Should I be 
> doing
> this instead?

SetDIBitsToDevice is not a thread-safe function. I'd suggest looking up the 
DrawDib functions for simplicity because you'd need to convert your DIB to a 
DDB before blitting it to the screen.

The VCL draw functions aren't thread-safe either.

HTH

Jon

Technical Details

Message-ID: <45f5b4dc$1@newsgroups.borland.com>

Path:

arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

References:

<45f57403@newsgroups.borland.com> <45f59433$1@newsgroups.borland.com> <45f5973e$1@newsgroups.borland.com> <45f598bf$1@newsgroups.borland.com> <45f59c41$1@newsgroups.borland.com> <45f59e8e$1@newsgroups.borland.com> <45f5aca4@newsgroups.borland.com>

Show Full Headers

Complete Article Headers

X-Google-Thread: 10cc67,411b13b57e2ea81a
X-Google-Attributes: gid10cc67,public
X-Google-Language: ENGLISH,ASCII-7-bit
From: "Jonathan Benedicto" <invalid@nobody.com>
Newsgroups: borland.public.cppbuilder.nativeapi
References: <45f57403@newsgroups.borland.com> <45f59433$1@newsgroups.borland.com> <45f5973e$1@newsgroups.borland.com> <45f598bf$1@newsgroups.borland.com> <45f59c41$1@newsgroups.borland.com> <45f59e8e$1@newsgroups.borland.com> <45f5aca4@newsgroups.borland.com>
In-Reply-To: <45f5aca4@newsgroups.borland.com>
Subject: Re: Multi-Thread HDC and video display
Date: Mon, 12 Mar 2007 16:15:57 -0400
Lines: 32
MIME-Version: 1.0
Content-Type: text/plain;
 format=flowed;
 charset="iso-8859-1";
 reply-type=original
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Windows Mail 6.0.6000.16386
X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16386
NNTP-Posting-Host: 74.115.18.89
Message-ID: <45f5b4dc$1@newsgroups.borland.com>
X-Trace: newsgroups.borland.com 1173730524 74.115.18.89 (12 Mar 2007 13:15:24 -0800)
Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail

Reply to Parent Message