447599 - mozMeasureText returns incorrect value

Status: RESOLVED WORKSFORME

(Core :: Graphics: Canvas2D, defect)

Description

[Leslie P. Polzer]

User-Agent:       Opera/9.51 (X11; Linux i686; U; en)
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9) Gecko/2008071111 IceCat/3.0

mozMeasureText returns incorrect values for me (see URL for the result of this JS fragment):

  <div style="background:grey">
    <canvas id="cv" width=300 height=200 style="background:red"/>
  </div>

  <script type="text/javascript">
    var ctx = document.getElementById("cv").getContext("2d"),
        text = "Foobar"
        textWidth = ctx.mozMeasureText(text),
        x = (ctx.canvas.width - textWidth)/2;

    ctx.strokeRect(x, 100, textWidth, 1)

    ctx.translate(x, 100);
    ctx.mozDrawText(text);

Problem seems to be independent of zoom.

Reproducible: Always

Comment 1

[Sylvain Pasche]

WFM with Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9) Gecko/2008061015 Firefox/3.0 or  Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1a1pre) Gecko/2008072401 Minefield/3.1a1pre

Could you try with an official Firefox build to see if the issue is IceCat specific?

Comment 2

[Leslie P. Polzer]

Broken too on

Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.9.0.1) Gecko/2008070206 Firefox/3.0.1

as expected.

Comment 3

[Leslie P. Polzer]

Suppose it's a bug that has been fixed in 3.1?

Comment 4

[Sylvain Pasche]

well, your testcase worked for me for both 3.0 and 3.1, so maybe it does not show on my system for some reasons (font configuration or other things), I tested on an Ubuntu 8.04. It would be interesting if you could test with a trunk build to know if this is fixed on 3.1.

Comment 5

[Leslie P. Polzer]

WFM in 3.1a1 Shiretoko.
closekthx.