887113 - Invalidation region clipped when drawing path

Status: NEW

(Core :: SVG, defect)

Description

[Brian Birtles (:birtles)]

Attachment: Screenshot showing the problem on Nexus 7

When drawing an SVG path on Fennec, parts of the path sometimes get clipped.

For the test case in the URL, a strip along the right-side and bottom-side of the canvas don't show any updates to the path. However, if you force a redraw by rotating the tablet then whole path is shown.

The size of the region appears to differ by device (presumably based on screen-size / resolution). Also, this particular test case appears to work as expected in landscape mode.

It works as expected on Firefox desktop.

Comment 1

[Brian Birtles (:birtles)]

Attachment: Screenshot from Nexus 7 when starting to draw in the clipped region

If you start drawing in the "clipped" region you typically get part of the path drawn and then it stops and continues from the non-clipped region.

Again, if you rotate the device to force a re-render everything is visible indicating no problem in receiving and processing events.

Comment 2

[Brian Birtles (:birtles)]

Attachment: Screenshot from HTC One J

The same test case on an HTC One J. As you can see, the "clipped" region is larger.

Comment 3

[Brian Birtles (:birtles)]

Attachment: Screenshot from a different application--clipped region is at top of canvas

The area that gets clipped sometimes appears at the top of the canvas.

The attached screenshot is from a more complex application. In this case the top of the canvas gets clipped. Note also that in this application the problem occurs both in portait and landscape mode.

Note that the actual application (http://parapara-editor.mozlabs.jp/test) has been patched to work around this by shifting the container element of the canvas up 50pixels, then expanded the bounding box of the SVG element accordingly.

Comment 4

[Brian Birtles (:birtles)]

Also, I have tested this in both Firefox 22 and 25 and see the same results.