Thank you for your answer. 2018-05-09 13:22 GMT+02:00 johannes hanika <hana...@gmail.com>:
> heya, > > On Wed, May 9, 2018 at 12:27 PM, rawfiner <rawfi...@gmail.com> wrote: > > 2018-05-08 17:16 GMT+02:00 johannes hanika <hana...@gmail.com>: > >> i'm guessing you want to detect whether you are running a > >> DT_DEV_PIXELPIPE_FULL pipe in darkroom mode (as opposed to > >> DT_DEV_PIXELPIPE_PREVIEW or _EXPORT) and then do this downscaling > >> yourself before running your algorithm on reduced resolution. > >> > > > > Yes, and I would like to know the zoom factor in case of > > DT_DEV_PIXELPIPE_PREVIEW , in order to downscale only if the image is > > sufficiently zoomed out (for example, I don't want to downscale the > image if > > the zoom is at 90%, but I want to downscale if it is below 50%). > > right. to determine the total scale factor, you would need to do > something like for instance in sharpen.c: > > const int rad = MIN(MAXR, ceilf(d->radius * roi_in->scale / > piece->iscale)); > > which determines the pixel radius scaled by input buffer scaling > (iscale) and region of interest scaling (roi_in->scale). > Yes, I have seen that kind of things in the code of non local means. Yet, if I understand correctly, this allows to retreive the scale factor for an already downscaled image, i.e. when the image was downscaled previously in the pipeline. What I would like is a bit different, as it would be to know if I can downscale the image or not, depending on the zoom level in the darkroom. But I guess that I will find the necessary information in the function dt_iop_clip_and_zoom_mosaic_half_size_f() that you pointed me out! > note that the preview pipe is what fills the whole image but > downscaled (iscale != 1) in the navigation view in the top left > corner. the "full" pipeline fills the pixels in the center view of > darkroom mode, at exactly the scale and crop you see on screen (iscale > == 1 mostly but the other scale and bounds in roi_in will change with > the current view). > > to find out whether you're running either one of the two you'd write > something similar to bilat.c: > > if(self->dev->gui_attached && g && piece->pipe->type == > DT_DEV_PIXELPIPE_PREVIEW) > Ok, thank you for these explainations I think I have everything I need to make some new trials! Regards, rawfiner ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
