Open
Bug 1079716
Opened 10 years ago
Updated 2 years ago
Incorrect subpixel font rendering with ClearType
Categories
(Core :: Graphics, defect)
Tracking
()
UNCONFIRMED
People
(Reporter: mark, Unassigned)
Details
Attachments
(5 files)
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 Build ID: 20140923175406 Steps to reproduce: I created an HTML pull-down menu using LIs. See reduced testcase attached to this bug. STR are on Windows 7, Firefox-release, AMD video hardware, Platform update installed (DirectWrite 6.2.9200.16492). STR: 1. Make sure HWA is on and you're using ClearType 2. Move the mouse over the different items in the menu to open items and sub-menus Actual results: Subpixel font rendering is often bolder/blurry greyscale (should not be used) and flips between ClearType and Greyscale randomly as different items are hovered over. The effect is clearest with light text on dark backgrounds. Expected results: Font rendering should always be ClearType
Reporter | ||
Comment 1•10 years ago
|
||
I verified with HWA off in Windows XP in a VM (blocked graphics adapter) with just cleartype enabled, and the same thing happens there, so it's not HWA related. That's on the cairo back-end without hardware accelerated windows. Adapter Description VMware SVGA II Adapter Drivers vmx_fb Adapter RAM Unknown Device ID 0x0405 Direct2D Enabled Blocked for your graphics card because of unresolved driver issues. DirectWrite Enabled false (0.0.0.0) Driver Date 7-1-2011 Driver Version 11.8.11.0 GPU #2 Active false GPU Accelerated Windows 0/1 Basic Blocked for your graphics card because of unresolved driver issues. Vendor ID 0x15ad WebGL Renderer Blocked for your graphics card because of unresolved driver issues. windowLayerManagerRemote false AzureCanvasBackend skia AzureContentBackend cairo AzureFallbackCanvasBackend cairo
Summary: Incorrect subpixel font rendering with HWA+ClearType → Incorrect subpixel font rendering with ClearType
Could you attach a screenshot of the rendering on your machine, please. (at the highest zoom if possible)
Flags: needinfo?(mark)
Reporter | ||
Comment 5•10 years ago
|
||
This screenshot (400%) is taken on Windows 7 with cleartype and direct2d enabled. it shows cleartype and greyscale mixed. Moving the mouse over other selections will kind of randomly switch the rendering between the two.
Reporter | ||
Comment 6•10 years ago
|
||
Same menu on Windows XP, hardware acceleration disabled (blocked driver), cairo back-end. Looking at it close up, I noticed that what is pure grey on direct2d, seems to be a mix of cleartype and grey here. The cleartype settings on this setup are not really tuned so looks a little funky. The mix is odd... is the subpixel rendering applied twice on the same glyphs?
Flags: needinfo?(mark)
Updated•2 years ago
|
Severity: normal → S3
You need to log in
before you can comment on or make changes to this bug.
Description
•