Headers should be animated properly

hmeine / pdfdecanter

PDF-based presentation program

Apache License 2.0

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Headers should be animated properly #6

Open hmeine opened 12 years ago

hmeine commented 12 years ago

Currently, the header transition is a little bit buggy: if two frames have overlapping, but not congruent header rects, the new header is first faded in, then the old one is faded out. (This is a workaround for some even more ugly effects that happened due to limited opacity support in the graphics item hierarchy – no transparency groups – and other problems.)

We would like to see a direct blending from old to new header in all cases.

hmeine commented 11 years ago

In the meantime, the rendering has changed, but it still looks bad.

Proper blending still to be done.

hmeine commented 10 years ago

Current status (in try_known_colors branch): headers are represented correctly with alpha, but old header is faded(?) out only after fading in is finished. (Problem is that fading out + fading in != fading from->to.)

hmeine commented 9 years ago

Obviously, proper blending needs a from and a to pixmap. We could achieve that on the level of 'layers', which we have already on two levels:

in frameItems(), and
in animatedTransition() (where we effectively move items from the static layers onto animated ones).