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when i want to draw 2d image, no locking, no update of image, which method is fastest, is there faster way that i don't yet know ? when i use an image with format D3DFMT_A8R8G8B8, is it slower than D3DFMT_X8R8G8B8 ? is D3DDevice->StretchRect() faster to use it instead of D3DDevice->DrawPrimitiveUP() ? is LPD3DXSPRITE faster than all ? which is fastest, i just want to know. and i want to load huge images faster,...

Ok, i have come up with a simple solution. This is how to create an offscreen buffer (DIB32) and load a 24bit texture and make it DIB32 compatible. It seems i dont need to set the bmiHeader.biSizeImage value? Just zero it? Code: // First we need a device context that is compatible // with the desktop settings. (1024x768x32 on my PC) HDC BufferDC = CreateCompatibleDC(NULL); // Now we describle a format for the offscreen buffer. BITMAPINFO...

GDI+ as a library is thread safe but not the objects manipulated. If you take a Graphics object and you try to access it from 2 different threads, an exception will be thrown. If you take 2 threads and eah one instanciates its own Graphics object then it's ok. But if both threads call DrawImage(), it's still ok but the method uses a lock so the 2 calls a processed sequentially. When you use GDI+, you don't have to draw directly...

ok... I believe that my video adapter does not support 2 separate blendings. but why doesn't the reference drive type support it?

No he wants to convert the image using ICC profiles color conversion. I have the same problem when I convert from CMYK to RGB. My code is similar to yours. The result is not what I expect. If you find the cause to the problem please post it.

Yes, I understand. What I was saying was that if I remember correctly, you are not allowed to draw to the same device context from 2 threads, at the same time. I forget where I read that, however. I think one reason has to do with the selecting of pens and brushes (one thread may select a pen; context switch; the other thread selects a different pen; context switch; the first thread assumes his pen is still selected). Viggy

Have you looked at ImageMagick? http://www.imagemagick.org

I wrote an application that hosts the Windows Media Player. It loads individual video files (.wmv) from a list box control. When a selection is made, the control shows a black screen until the user clicks the play button. Does anyone know how to display the first frame (or, thumbnail) that would represent the video? Windows explorer does this when you change to thumbnail view.

I would suggest using the ID3DXSprite interface for rendering the images. I don't know about the spped of loading images but what you are doing seems to be fine. Have you tried the D3DXLoadTextureFromFileEx function, don't know how it will compare. About your .dds format, if you open up the directX texture tool go to: Format->Change Surface Format... and select one of the "Four CC" formats, they are...

yes ,it works .bu t photoshop can not convert a group of image files.