435244 - Add initial support for zooming

Status: VERIFIED FIXED

(Firefox for Android Graveyard :: Panning/Zooming, defect)

Description

[Mark Finkle (:mfinkle) (use needinfo?)]

Attachment: WIP: initial zoom support v1

Fennec needs to support zooming in and out of web content sections and pages. The basic strategy is to use two canvases (offscreen and onscreen) to achieve the zoom effect. The current web content is drawn onto the offscreen canvas and then the offscreen canvas is drawn (scaled) onto the onscreen canvas.

This patch adds the basic infrastructure for the zooming system. Obvious problems with current patch:
* its slow and should be converted to use constant time animation.
* the current math only works if the web content is not scrolled (panned)
* zooming image doesn't exactly match up with the zoomed content.

But it's a start

Comment 1

[Mark Finkle (:mfinkle) (use needinfo?)]

Attachment: WIP: initial zoom support v2 (panning breakage fix)

Fixes bustage in panning (endPan)

Comment 2

[Mark Finkle (:mfinkle) (use needinfo?)]

from IRC discussion, this WIP has been landed, but zoom animation has been disabled for now.

Comment 3

[Joel Maher ( :jmaher ) (UTC -8)]

verified with beta3