BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Re: Scrolling Bitmat using Directx          BorlandTalk.com Forum Index -> C++ Builder (Graphics) View previous topic :: View next topic   Author Message zhang li Guest Posted: Fri Jun 27, 2003 11:27 pm    Post subject: Re: Scrolling Bitmat using Directx Quote: I was thinking that scrolling a BMP pixel by pixel on the screen was an easy matter. Try set Top and Left to newly position of MainForm. May wrap the Bitmap before moving. Li Back to top Gnum Guest Posted: Thu Jul 10, 2003 7:06 am    Post subject: Re: Scrolling Bitmat using Directx You should sinchronize actual drawing of the next frame to screen with real-timer or in a best way with monitor-refresh rate. It's independent of kind of changes on a picture (scrolling, moving any objects, transparency changes...) Have fun! Gnum "Jhon C." <m_moioli (AT) libero (DOT) it> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:3ef8716c (AT) newsgroups (DOT) borland.com... Quote: Hi, I was thinking that scrolling a BMP pixel by pixel on the screen was an easy matter. First of all I tried scrolling a TImage on the form's canvas of my application and the result was not good (increasing the speed the scrolling lost fluidity). So I tried with the direct X. Now I think to be arrived at a dead point: actually my SW load the bmp in a "off-screen" surface and then using BltFast method the bmp is copied scrolled into the primary visible surface. Into the BMP I have a text that I want scroll on video so I copy a scrolled section of the source bmp always in the same point of the the visible surface. All is done into an hight priority thread and the bmp is very small..... it's incredible but the problem persist: the image don't scroll fluidly. I also tryed to use different types of time calculation : GetTickCount,Sleep,QueryPerformanceCounter but with not better results. The BMP or dither or go fluid for some seconds and then jump a pixel... it's no a good result!!! Is there anyone that can help me? I was thinking that was an easy matter....... Thank you very much to all. 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