Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101013 Firefox/4.0b8pre ID:20101013225426 Under condition of D2D enabled, When mouse hover a Link, a pixel of the right side of link text does not change. If I set gfx.direct2d.disabled to true, the problem does not happen. Reproducible: Always Steps to Reproduce: 1. Start Minefield with new profile 2. Open URL ( http://dic.nicovideo.jp/a/photoshop ) 3. Mouse Hover "Adobe Photoshop" Actual Results: a pixel of the right side of link text does not change. Expected Results: no repaint issue.

I forgot to mention Graphics hardware. Adapter Description: ATI Radeon HD 4300/4500 Series ---- Actually I use HD4350 Vendor ID: 1002 Device ID: 954f Adapter RAM: 512 Adapter Drivers: aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64 Driver Version: 8.771.0.0 Driver Date: 8-25-2010 Direct2D Enabled: true DirectWrite Enabled: true GPU Accelerated Windows: 2/2 Direct3D 9

How strange, I cannot reproduce this, I have no clue at this point what could be happening.

(In reply to comment #3) > How strange, I cannot reproduce this, I have no clue at this point what could > be happening. Umm. Try Step 3 after change several pixels window width.

No luck, I've also tried switching Aero Glass and Basic.

(In reply to comment #5) > No luck, I've also tried switching Aero Glass and Basic. It happens on Windowws 7 Classic, Aero and Aero Basic. So, It may depend on Graphics driver or Font-face of Japanese text part.

(In reply to comment #6) > (In reply to comment #5) > > No luck, I've also tried switching Aero Glass and Basic. > It happens on Windowws 7 Classic, Aero and Aero Basic. > > So, It may depend on Graphics driver or Font-face of Japanese text part. Both would strongly surprise me.. but.. it does seem that way.

I don't think this blocks, but it sure is ugly, so I'd welcome a patch.

regression windo: Works: http://hg.mozilla.org/mozilla-central/rev/cc06207827f4 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6pre) Gecko/20100901 Firefox/4.0b6pre ID:20100902020913 Fails: http://hg.mozilla.org/mozilla-central/rev/dc2939f2640d Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b6pre) Gecko/20100901 Firefox/4.0b6pre ID:20100902051352 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=cc06207827f4&tochange=dc2939f2640d And If I set gfx.font_rendering.harfbuzz.level to 0, the problem was gone. so, landing of Bug 569531 causes the problem

I reproduced this, maybe cause in D2D/DW with bitmap-embedded font. OS: Windows Vista Home Premium SP2 (ja-JP) GFX: GeForce 8600 GTS (Driver 258.96) UA: Mozilla/5.0 (Windows NT 6.0; rv:2.0b8pre) Gecko/20101013 Firefox/4.0b8pre Direct2D: Enabled DirectWrite: Enabled gfx.font_rendering.harfbuzz.level: 1 Accelerated Window: Direct3D 9 Font for Japanese Content: Propotional: sans-serif (Size: 16) Serif: ＭＳ Ｐ明朝 (MS PMincho 5.00) Sans-serif: ＭＳ Ｐゴシック (MS PGothic 5.00) Monospace: ＭＳ ゴシック (MS Gothic 5.00, Size: 16) Minimum font size: none Default Encoding: Japanese (Shift_JIS)

I cannot reproduce any more on latest m-c nightly: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b11pre) Gecko/20110126 Firefox/4.0b11pre ID:20110126064706 Graphics Adapter Description: ATI Radeon HD 4300/4500 Series Vendor ID: 1002 Device ID: 954f Adapter RAM: 512 Adapter Drivers: aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64 Driver Version: 8.801.0.0 Driver Date: Direct2D Enabled: true DirectWrite Enabled: true WebGL Renderer: TransGaming Inc. -- ANGLE -- OpenGL ES 2.0 (git-devel Jan 13 2011 03:37:36) GPU Accelerated Windows: 1/1 Direct3D 10 Fixed range: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=8d52e3b68ca6&tochange=e0ea4e4d401f