Images not resizing to fit the screen in scrollview

[danielweck]

Originally posted by @vanisuthamathi
readium/readium-js#57

Steps to Reproduce:

1. Enable scroll view - readium.reader.updateSettings({
   scroll: "scroll-doc"
   }); in the Epub reader view

2. Read any article containing big image sizes like 600x511, 600X300 and etc.,
   Observation:

   Images are not resizing to fit the screen as shown in the attached image.
   

Note: We have fixed in our application by adding css properties to the image tags after the content documents are loaded
$(imgTags).css('max-width', '98%');
$(imgTags).css('max-height', '98%');

Please fix in the readium library

[danielweck]

See candidate fix in feature branch:
https://github.com/readium/readium-shared-js/tree/feature/scroll_img_resize

UPDATE: feature branch now deleted, but commit preserved as reference (proposal: scroll view acts like regular scrolling webpage => no arbitrary resize-to-fit imposed by reading system, just application of authored CSS styles).

Code diff:
30c0ecd

I do not think that this is a fully-satisfactory solution though, as many books I tried have image width/height either set via CSS or attributes, and the application of maximum values irrespective of aspect ratio sometimes produces unexpected / undesirable results. Furthermore, some images do not resize when opening the page for the first time, only when resizing the viewport.

In fairness though, the same problem already exists with the columnized paginated view:
https://github.com/readium/readium-shared-js/blob/develop/js/views/reflowable_view.js#L669

...so one could argue that the behaviour should be consistent across all types of reflowable views, and that we should apply the same image resizing algorithm to the scroll view?

[danielweck]

See also: #45

[danielweck]

See also:
#88

[danielweck]

Shared utility function between scroll and column-paginated views:

a64dc4d

Feature branch:

https://github.com/readium/readium-shared-js/tree/feature/scroll_img_resize

UPDATE: feature branch now deleted, but commit preserved as reference (proposal: scroll view acts like regular scrolling webpage => no arbitrary resize-to-fit imposed by reading system, just application of authored CSS styles).

[rkwright]

I created a test file and verified this bug in the current build of the Chrome Extension. The file is here:
https://readiumfoundation.box.com/s/c9rxcdaszp39dswiw7su