1010076 - [Flatfish] Canvas stroke display fragmented with touch events

Status: RESOLVED WONTFIX

(Firefox OS Graveyard :: Gaia, defect)

Description

[justin]

Attachment: canvas.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:32.0) Gecko/20100101 Firefox/32.0 (Beta/Release)
Build ID: 20140513030201

Steps to reproduce:

1. Clone sample code and install or load in web browser on device: https://github.com/dawsoju/touch-api-canvas
2. Open app and draw with finger in top left 600x300 pixels of screen.



Actual results:

Fragmented lines display in canvas on flatfish device.


Expected results:

A stroke which changes colors as painted should display.

Comment 1

[guillaume]

I have set up an experiment using a similar application to compare between SVG and canvas rendering.

In the blog post linked below, you will find measurements showing that canvas is surprisingly slow to render compared to SVG. You will also find comparisons with Firefox for Android and Chrome on a Nexus 7 tablet. In Firefox OS on the Flatfish, it seems that the rendering engine records very few touch events when it has to repaint the canvas repeatedly, which results in a "fragmented line display".

http://guillaume.baierouge.fr/2014/08/08/gribouille-a-demo-hand-writing-drawing-application-for-firefox-os-on-the-flatfish-tablet/

The source code of the application is available here:
https://github.com/senshu/FxOS-Gribouille

Comment 2

[BMO Automation]

Firefox OS is not being worked on