Re: .jpg thumbnailing

[Gábor Farkas <gabor z10n net>]

Alexander Larsson wrote:
> On Mon, 2004-10-11 at 11:23 +0200, Kotrla Vitezslav wrote:
>
>
> > Are there any problems with checking picture dimensions instead of byte size?
>
>
> Yes. Its slow. You need to do file i/o to get it.

hmmmm...as i see, when displaying a picture one always have to get the 
dimensions...
or, to reformulate , one always has to scale.

as i understand the displaying code goes like:

===
long imageSize = somehowGetImageFileSize();

if (imageSize > 30kb)
	displayNormalPictureFromThumbnail();
else
	displayIcon();
===

now, displayIcon will open the file, rescale it to icon-size, and 
display it. that means he gets the dimensions. couldn't we modify the 
code to work like:

===
long imageSize = somehowGetImageFileSize();


if (imageSize > 30kb)
	displayNormalPictureFromThumbnail();
else
	{
		int x,y = somehowGetImageDimensions();
		if ( isIcon(x,y) )
			displayIcon();
		else
			displayNormalPicture();
	}
===





i understand this is not the cleanest approach, but it's a relatively 
small modification......
what do you think?

gabor