Re: Image display

Thanks for the code, I can't wait to try it! Unfortunately, when I 
put it into my code, I get a new set of problems:

(1) getConstPixels caused an exception, indicating that the 
cache_info->type==Undefined Cache, with the message "Pixel cache is 
not open". Any idea what this means, and how I can fix it? Am I 
supposed to call OpenCache directly?

(2) It's strange that the ImageMagick exception class seems to get 
corrupted. When it generates the exception, the message gets 
corrupted at exception.cpp:192, and the 'message' variable contains 
garbage. At line 191 it's fine. Any ideas?

Thanks!
Jerry

--- In imagemagick@y..., "Augusto_Roman" <Augusto_Roman@b...> wrote:
> --- In imagemagick@y..., "jlchappell" <jlchappell@y...> wrote:
> > I find that the example method of displaying an image in the NT 
> > program that's supplied is rather slow. Does anyone have a fast 
way 
> > of displaying a changing image?
> > 
> > Jerry
> 
> I use the following, and it's reasonably fast:
> (fast enough for a document manipulation program, not games/video)
> 
> if (m_Image_isValid)  // I keep track of this myself
> {
>         // Get the image dimensions and a pointer to the pixels
> 	const Geometry& imsz = m_Image.size();
> 	const PixelPacket* ppix = m_Image.getConstPixels( 0 , 0 , 
> imsz.width() , imsz.height() );
> 
>         // Construct a BITMAPINFO object that describes the
>         // pointer to the pixels
> 	BITMAPINFO bmi;
> 	bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
> 	bmi.bmiHeader.biWidth = imsz.width();
> 	bmi.bmiHeader.biHeight = -imsz.height();
> 	bmi.bmiHeader.biPlanes = 1;
> 	bmi.bmiHeader.biBitCount = 32;
> 	bmi.bmiHeader.biCompression = BI_RGB;
> 	bmi.bmiHeader.biSizeImage = 0;
> 	bmi.bmiHeader.biXPelsPerMeter = 1;
> 	bmi.bmiHeader.biYPelsPerMeter = 1;
> 	bmi.bmiHeader.biClrUsed = 0;
> 	bmi.bmiHeader.biClrImportant = 0;
>         // bmi.bmiColors is unused
> 
>         // Get the client window size
>         // (because I want to fill the whole client area)
> 	CRect win;
> 	GetClientRect(win);
> 
> 	// Set fast and color-friendly stretch mode
> 	::SetStretchBltMode( *pDC, COLORONCOLOR );
> 	::StretchDIBits( *pDC,
> 		0,0,win.Width(),win.Height(),     // target rect 
> (x,y,w,h)
> 		0,0,imsz.width(),imsz.height(),   // rect within 
> source image (x,y,w,h)
> 		ppix,&bmi,DIB_RGB_COLORS,SRCCOPY);
> }


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