<div dir="ltr">Hi !<div><br></div><div><span style="color:rgb(80,0,80);font-family:arial,sans-serif;font-size:13px">>> One unpleasant effect is: when zooming in, it first loads a preview, then the image</span><br style="color:rgb(80,0,80);font-family:arial,sans-serif;font-size:13px">
<span style="color:rgb(80,0,80);font-family:arial,sans-serif;font-size:13px">>> disappears, then it shows at full resolution.</span><br></div><div><br></div>I have the same problem here on master, but it seems to affect vectors as well as rasters.<div>
It's more easy to spot (and more annoying) with layers taking a long time to load/render, such as big rasters, complex vectors, or layers from a slow distant server.<br><div><div><br></div><div>As far as I see, here what's happening upon user interaction (zoom or pan)</div>
<div><br></div><div>1) the previously displayed image is displayed offsetted/resampled (instantaneous)</div><div>2) the image disappears for a short amount of time (probably during the recalculation of the image)</div><div>
3) the recomputed image is show.</div><div><br></div><div>The problem seems to be that the previous image is removed while rendering, instead of being kept until the layer has been refreshed.</div><div><br></div><div>
This can be also very annoying when working with a lot of layers.</div><div>Since layers are made invisible while rendering, they all reappear progressively, one after the other, leading to a map canvas which seems almost animated after finishing to interact with it.</div>
<div>Here's a video of the effect, displaying a lot of shapefile layers : <a href="https://www.dropbox.com/s/ofa3pe5mqss3gm2/LayerRendering_01.avi">https://www.dropbox.com/s/ofa3pe5mqss3gm2/LayerRendering_01.avi</a></div>
<div>(sorry, it's quite abstract, but because of rights, I can't give a better view of this data)</div><div><br></div><div><div>Do you confirm ? Did someone open a ticket related to this already ? (didn't find one in the list)</div>
<div><br></div><div>Thanks !</div><div><br></div><div>Olivier</div></div></div></div></div>