[Pkg-chromium-maint] Bug#789176: chromium: in javascript method toDataUrl of Canvas object returns empty result for "image/jpeg" argument

Thu Jun 18 15:22:03 UTC 2015

Package: chromium
Version: 43.0.2357.124-1
Severity: important

Dear Maintainer,

In javascript when saving canvas contents to data-url as type "image/jpeg" I get data-url with empty contents.

Here is a snippet demonstrating bug:

<head>
    <body>
        <script>
            var canvas = document.createElement('canvas');
            canvas.width = 100;
            canvas.heigh = 100;
            var dataUrl = canvas.toDataURL("image/jpeg");
            var serialized = dataUrl.split(",")[1];
            var status, message;
            if (serialized.length) {
                status = 'PASS'
            } else {
                status = 'FAILED'
            }
            message = "<h1>" + status + "</h1>" + dataUrl.substring(0, 100);
            document.write(message);
        </script>
    </body>
</head>
You can view result here: https://jsfiddle.net/pb68a9oo/

Result of toDataUrl: "data:,"
Expected result: "data:image/jpeg;base64,/9j/4AAQSkZJRgABAgAAAQABAAD/2wCEAAUDAw..."

Saving as "image/png" produces expected result.
Test for "image/jpeg" passes in
    * iceweasel 38.0.1-5 in Debian testing
    * Chromium 43.0.2357.81-0ubuntu0.14.04.1.1089 in Ubuntu
    * Chrome 43.0.2357.124 m in WindowsXP

Test fails in 
 * chromium 43.0.2357.124-1 from sid
 * chromium 43.0.2357.65-1 from testing

-- System Information:
Debian Release: jessie/sid
  APT prefers testing
  APT policy: (900, 'testing'), (100, 'unstable'), (100, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.14-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages chromium depends on:
ii  libasound2           1.0.28-1
ii  libatk1.0-0          2.12.0-1
ii  libc6                2.19-10
ii  libcairo2            1.14.0-2.1
ii  libcups2             1.7.5-11
ii  libdbus-1-3          1.8.6-2
ii  libexpat1            2.1.0-6
ii  libfontconfig1       2.11.0-6
ii  libfreetype6         2.5.2-1.1
ii  libgdk-pixbuf2.0-0   2.30.8-1
ii  libglib2.0-0         2.42.1-1
ii  libgnome-keyring0    3.12.0-1
ii  libgtk2.0-0          2.24.24-1
ii  libharfbuzz0b        0.9.35-1
ii  libjpeg62-turbo      1:1.3.1-10
ii  libnspr4             2:4.10.7-1
ii  libnspr4-0d          2:4.10.7-1
ii  libnss3              2:3.17-1
ii  libpango-1.0-0       1.36.8-3
ii  libpangocairo-1.0-0  1.36.8-3
ii  libpci3              1:3.2.1-2
ii  libsnappy1           1.1.2-4
ii  libspeechd2          0.8-6
ii  libspeex1            1.2~rc1.2-1
ii  libsrtp0             1.4.5~20130609~dfsg-1
ii  libstdc++6           4.9.1-12
ii  libx11-6             2:1.6.2-3
ii  libxcomposite1       1:0.4.4-1
ii  libxcursor1          1:1.1.14-1
ii  libxdamage1          1:1.1.4-2
ii  libxext6             2:1.3.2-1
ii  libxfixes3           1:5.0.1-2
ii  libxi6               2:1.7.4-1
ii  libxml2              2.9.1+dfsg1-4
ii  libxrandr2           2:1.4.2-1
ii  libxrender1          1:0.9.8-1
ii  libxslt1.1           1.1.28-2
ii  libxss1              1:1.2.2-1
ii  libxtst6             2:1.2.2-1
ii  x11-utils            7.7+2
ii  xdg-utils            1.1.0~rc1+git20111210-7.1

chromium recommends no packages.

Versions of packages chromium suggests:
pn  chromium-l10n  <none>

-- no debconf information