408623 - FireFox 3.0 plugin on windows printing seems to be broken

Status: RESOLVED FIXED

(Core :: Printing: Output, defect, P3)

Description

[Phil Race]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
Build Identifier: FireFox 3.0 prebeta2

The Java plugin is unable to print correctly in firefox 3.0,
apparently due to problems with the information in the structure that FF3
passes to describe the window position.

I am trying to print an applet that is essentially at the
top-left hand corner of the web page.

FF3 calls our NPP_Print(NPP instance, NPPrint* platformPrint)
where NPPrint contains
1) a printer DC
2) an NPWindow

The printer DC correctly represents my HP laserjet and
reports 1200dpi and an extent of 9600x12780 which
corresponds to an imageable area of 8.0" x 10.65" on my 8.5x11 paper

However the NPWindow seems off.
It reports x=7364, y=2880, w=6000, h=6000

I guess that's fine these are in device coords, so
long as you know its that, and not screen coords.

Also width and height seem probably fine 5"x5" is I think
how large ff3 wants us to print.

But the x and y are way off.
We are being asked to print at x=6.14", y=2.40"
I'd expect maybe x=1200, y=1200 or thereabouts.

I can adjust for this being a printer DC, not an enhanced
metafile as in other browsers.

But without correct x,y values here, we will print
in the wrong position, perhaps mostly off the page.


Reproducible: Always

Steps to Reproduce:
See details
Actual Results:  
See details

Expected Results:  
See details.

This is only part of the problems.
In addition, the area of the page where the applet should print - if
the window x and y from FF3 were correct  is apparently over-printed by FF3.
This can be seen when hacking the plugin to print at (0,0) on the page,
the rectangular area of the page acts like a clip. Eg there's a strip of
the applet content printed along the top, and down the left hand side, 
but it is over-printed by a white rectangle in the parts that would be
printed in the area the applet should appear.

Comment 1

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Attachment: fix origin

Should be a simple fix here -- the printing code was grabbing the origin directly from the RC, where it's coming back in appunits, and then not converting the position to dev units.  I'm guessing the reason for this is that elsewhere in the code we always use GetWindowOriginInPixels() which returns things in dev units, but (I think?) we can't do this here since we're printing and we have pagination involved.

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Comment on attachment 296030 [details] [diff] [review]
fix origin

use presContext not PresContext()

Comment 3

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Checked in (with presContext).