18162 - partly transparent image as table background draws random pixels

Status: VERIFIED DUPLICATE of bug 18170

(Core :: Layout: Tables, defect, P3)

Description

[Mats Palmgren (inactive)]

TO REPEAT:
1. start mozilla, load the URL or testcase
2. look at the navigation table to the left titled "Hovedmenu"

ACTUAL RESULTS:
The left part of it contains random pixels.

EXPECTED RESULTS:
The left part of it should be a blue striped area (like the page background).

BUILD AND PLATFORM:
Bug occurs in build 1999110508 on Windows 98 SE.

ADDITIONAL INFO:
There is still random pixels after resizing or covering the window.

Comment 1

[Mats Palmgren (inactive)]

Attachment: testcase

Comment 2

[Mats Palmgren (inactive)]

Additional info on the testcase: if you remove 1 row the problem disappears.

Comment 3

[Patrick C. Beard]

Table rendering?

Comment 4

[karnaze (gone)]

Kevin, do you have any ideas on what is going on. The area to the far left is
black on my WinNT build (instead of random bits as reported). When I drag a
window over the table the background becomes blue like I think it should.
This leads me to believe that the table painting code is not faulty. Next when I
resize the window, the same incorrect black shows up. Is this a painting
problem. The image on the table seems to provoke this.

Comment 5

[Kevin McCluskey (gone)]

This could be related to Patricks change to hold a list of invalid rects
in the ViewManager instead of expanding the invalidated area?. His change
may have uncovered a bug that was masked in the old code which painting too much.

Comment 6

[Kevin McCluskey (gone)]

Setting milestone to M14

Comment 7

[John Morrison]

See also bug #16100 which is for the same painting issue, but uses
<TD BACKGROUND> in stead of <TABLE BACKGROUND>

Comment 8

[Mats Palmgren (inactive)]

Improved Summary.

Comment 9

[ekrock's old account (dead)]

Bulk moving [testcase] code to new testcase keyword. Sorry for the spam!

Comment 10

[Kevin McCluskey (gone)]

Resorting to the slow blitting code fixes this bug

in nsCSSRendering::PaintBackground.
If I comment force it to do the following slow blitting code by commenting
out the TileImage logic above it works fine.

   // slow blitting, one tile at a time....
      for(y=y0;y<y1;y+=tileHeight){
        for(x=x0;x<x1;x+=tileWidth){
          aRenderingContext.DrawImage(image,x,y,tileWidth,tileHeight);
        }
      }



*** This bug has been marked as a duplicate of 18170 ***

Comment 11

[Chris Petersen]

Marking as verified dup of 18170.

Comment 12

[Pulsebot]

Pushed by ffxbld-merge:
https://hg.mozilla.org/releases/mozilla-beta/rev/381569e14464
[fenix] Update metrics.md for perf startup entries (https://github.com/mozilla-mobile/fenix/pull/18162)