Display more than one column icon

blaubach · 09-21-2013, 12:30 PM

With release 1.4 the option of adding more than one column icon was added:

Quote:

Column icons: Allow the use of multiple icons with column icon rules.
You can now have column icon rules display multiple icons in a single column, side by side. There are two ways to do this, either specify multiple icons when creating the rule, or create multiple rules that match the same book and specify the icon type to be 'composed' for every rule. See Preferences->Look & Feel->Column icons for details.

Unfortunately, when I try to add more than one icon the size these icons is tiny (see screenshot). Is this a bug or am I doing something wrong?

chaley · 09-21-2013, 12:54 PM

This can happen if the original icon was smaller than 128 pixels high. When an icon is added, calibre scales it down to 128x128 pixels preserving aspect ratio, but does not scale it up. The graphics toolkit will upscale a single image if needed when it is used as an icon, but when images are combined into a composed icon this upscaling does not happen.

Solution: ensure that all your original icons have at least one dimension greater than or equal to 128 pixels. Best is if they are square with both dimensions greater than or equal to 128 pixels.

Sabardeyn · 09-21-2013, 01:00 PM

I haven't had a chance to update yet, but my immediate thought is that there might be a size limit since the icon has to fit within the table's line height.

Otherwise larger icons might appear to display nothing when, in fact, they're simply showing clear/unused pixels in the corner of the icon image.

I cannot recall if there is a line height option in calibre's settings, but you could try playing with it a bit (and perhaps the icon column width) to see if the icon re-scales itself. I assume there is some kind of automatic aspect ratio re-scaling which is why I'm suggesting changing the cell size.

Hope this helps.

PS: LOL! I see Chaley beat me to posting.

chaley · 09-21-2013, 01:36 PM

I am going to fix the upscaling problem so that smaller icons are scaled up as needed. The fix will be in the next calibre release.

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09-21-2013, 12:54 PM	#2
chaley Grand Sorcerer Posts: 12,327 Karma: 8012652 Join Date: Jan 2010 Location: Notts, England Device: Kobo Libra 2	This can happen if the original icon was smaller than 128 pixels high. When an icon is added, calibre scales it down to 128x128 pixels preserving aspect ratio, but does not scale it up. The graphics toolkit will upscale a single image if needed when it is used as an icon, but when images are combined into a composed icon this upscaling does not happen. Solution: ensure that all your original icons have at least one dimension greater than or equal to 128 pixels. Best is if they are square with both dimensions greater than or equal to 128 pixels.

09-21-2013, 01:00 PM	#3
Sabardeyn Guru Posts: 644 Karma: 1242364 Join Date: May 2009 Location: The Right Coast Device: PC (Calibre), Nexus 7 2013 (Moon+ Pro), HTC HD2/Leo (Freda)	I haven't had a chance to update yet, but my immediate thought is that there might be a size limit since the icon has to fit within the table's line height. Otherwise larger icons might appear to display nothing when, in fact, they're simply showing clear/unused pixels in the corner of the icon image. I cannot recall if there is a line height option in calibre's settings, but you could try playing with it a bit (and perhaps the icon column width) to see if the icon re-scales itself. I assume there is some kind of automatic aspect ratio re-scaling which is why I'm suggesting changing the cell size. Hope this helps. PS: LOL! I see Chaley beat me to posting.

09-21-2013, 01:36 PM	#4
chaley Grand Sorcerer Posts: 12,327 Karma: 8012652 Join Date: Jan 2010 Location: Notts, England Device: Kobo Libra 2	I am going to fix the upscaling problem so that smaller icons are scaled up as needed. The fix will be in the next calibre release.

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