Bug 195555

Summary:	Add a new option to use a constant scrolling speed with Kenburns effect [patch]
Product:	[Applications] digikam	Reporter:	S. Burmeister <sven.burmeister>
Component:	Plugin-Generic-Presentation	Assignee:	Digikam Developers <digikam-bugs-null>
Status:	RESOLVED FIXED
Severity:	wishlist	CC:	caulier.gilles, phuockhanhnk94
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
Latest Commit:	https://invent.kde.org/graphics/digikam/commit/5534eb9de615d88a9ccc6280114e72ecb9c9b0f3	Version Fixed In:	7.2.0
Sentry Crash Report:
Attachments:	add option for constant speed of ken burns of presentation

Description S. Burmeister 2009-06-07 13:33:13 UTC

Version:           0.10 (using KDE 4.2.4)
OS:                Linux
Installed from:    SuSE RPMs

If one uses the ken burns effect for the slideshow one gets different scrolling speeds for landscape and portrait pictures. 

If there was an option to have a constant speed, digikam would calculate a longer time for portrait pictures and thus have a constant speed no matter what size the picture has.

I do not think it is necessary to have the exact same speed, i.e. if the pictures shown do not have the "normal" lenght-width ratios they would still have diffferent speeds.

Maybe adding a drop-down to select the ratio 4:3, 16:9 etc. would already be enough to fit most users' needs.

Comment 1 caulier.gilles 2021-02-21 05:56:57 UTC

Hi Le,

This Presentation tool entry sound like not to hard to implement as you start to know a little bit the plugin implementation now...

Please take a look to see what's possible to do as junior job.

Thanks in advance

Gilles

Comment 2 Phuoc Khanh LE 2021-03-02 23:36:49 UTC

Created attachment 136331 [details]
add option for constant speed of ken burns of presentation

This patch will add an of option to make speed of ken burns equal in every image. Speed is calculated by time between two times of "swap image". By this moment, this time is same by all images. So the speed of motion is proportional with height of image. 
The option "Ken Burns Same Speed" will adjust the speed by ratio between height and width. By using this option, the speed of motion is same for all images. This option is implemented in widget "advanced"

Comment 3 caulier.gilles 2021-03-09 03:05:30 UTC

Git commit 5534eb9de615d88a9ccc6280114e72ecb9c9b0f3 by Gilles Caulier.
Committed on 09/03/2021 at 03:02.
Pushed by cgilles into branch 'master'.

Apply patch #136331  for Phuoc Khanh Le to use the same visual Ken-Burns effects speed while playing Presentation on scrren.
FIXED-IN: 7.2.0

M  +1    -0    core/dplugins/generic/view/presentation/common/presentationcontainer.cpp
M  +1    -0    core/dplugins/generic/view/presentation/common/presentationcontainer.h
M  +2    -0    core/dplugins/generic/view/presentation/dialogs/presentation_advpage.cpp
M  +7    -0    core/dplugins/generic/view/presentation/dialogs/presentation_advpage.ui
M  +14   -4    core/dplugins/generic/view/presentation/opengl/presentationkb.cpp
M  +4    -0    core/dplugins/generic/view/presentation/opengl/presentationkb_p.h

https://invent.kde.org/graphics/digikam/commit/5534eb9de615d88a9ccc6280114e72ecb9c9b0f3