Actually I have an image of dimensions 7501x1220 at 100dpi and it displays fine. It also
displays an image with dimensions 14094 x 1834 at 150dpi. But there is this one particular
image of dimensions 7238 x 3135@72dpi. The image can actually be downloaded from
http://mpfwww.jpl.nasa.gov/MPF/parker/TwnPks_RkGdn_left_full.jpg. It's a very big JPEG
image. (> 12MB). When I display this image in OpenGL Image sample code it leaves a black
rectangular patch.
I had a misconception about the rowBytes parameter was a limiting factor. But it looks like it
is not. But any idea on why this image is not being displayed properly?
Thanks
prady
On Tue, 31 May 2005 Scott Thompson wrote :
>
>On May 30, 2005, at 4:58 PM, Pradeep Kumar wrote:
>>I am using the OpenGL Image sample code to open a panorama image with dimensions
7000+
>>X 3000+ pixels. It leaves a big rectangle of black area on the top left area when
displaying in
>>the window. I open the same image in qtgraphics QuickTime sample code and the
image
>>displays fine in the window. Although the code used in both these sample code uses
Graphic
>>Importer component to draw the only difference is that in the qtgraphics renders the
image to
>>a window and the OpenGL image sample code renders the image to a GWorld created
using
>>QTNewGWorldFromPtr.
>>
>>Is there a difference between the GWorld created by QTNewGWorld and NewGWorld
variants
>>and the one that is created for the window by NewCWindow?
>There really shouldn't be any difference between the ports created by all of these
methods, unless you are using different pixel formats. QTNewGWorld allows you to create
GWorlds with pixel types that that QuickDraw doesn't understand.
>>I realize that the rowBytes parameter is a limiting factor of GWorld, but is there a way to
work around this?
>
>At 7000 pixels wide your rowBytes should be somewhere in the neighborhood of 28000.
This is certainly a small enough number to fit into a long valued variable like the rowBytes.
How do you find the "rowByes" parameter to be a limiting factor?
>
--
prady
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