Re: [Openexr-devel] how to properly save with data window?

[Ciaran Wills]

On Feb 13, 2012, at 1:16 PM, Paul Miller wrote:

> When I specify for example a data window such as (-70,-154)-(649,331) for a 
> 720x486 image and then call writePixels(486), the library is crashing down in 
> copyFromFrameBuffer().
> 
> Perhaps this is the way I am adding Slices to my frame-buffer?
> 
> for (int i = 0; i < channels; i++)
> {
>       const half *pixels = pixPtr + i;
>       frameBuffer.insert(chanName, Slice(HALF, (char *)(pixels), sizeof(half) 
> * channels, sizeof(half) * width * channels));
> }
> 
> I am basing this on "3.2 Writing a Cropped Image" in the reading/writing 
> document. Though my RGBA pixels are packed into a single buffer.
> 
> What am I doing wrong?

I think you probably need to offset the pixel pointer to point at where pixel 
(0, 0) would be - section 2.2 explains the pixel pointer math a bit clearer.