922978 - clipping not working when GPU acceleration enabled on Intel 4 Series Express Chipset Family

Status: NEW

(Core :: Web Painting, defect)

Description

[:aceman]

For some reason in recent Aurora 26 GPU acceleration became enabled on my card (was blocklisted in former versions due to driver version being 6.14.10.52xx). Then I noticed clip was not working and the text flowed out of its box and overflowed surrounding content. This can be seen e.g. in the tab bar (if there are many tabs so that they are cropped, last tab title draws over the buttons on the right of the tabbar.

This is output of about:troubleshooting when accel is disabled (in options).
Graphics
Adapter Description	Mobile Intel(R) 4 Series Express Chipset Family
Adapter Drivers	igxprd32
Adapter RAM	Unknown
Device ID	0x2a42
Direct2D Enabled	Blocked for your graphics driver version.
DirectWrite Enabled	false (0.0.0.0)
Driver Date	10-21-2008
Driver Version	6.14.10.5002
GPU #2 Active	false
GPU Accelerated Windows	0/1 Basic
Vendor ID	0x8086
windowLayerManagerRemote	false
AzureCanvasBackend	skia
AzureContentBackend	none
AzureFallbackCanvasBackend	cairo
AzureSkiaAccelerated	0

Comment 1

[:aceman]

This is output when acceleration is enabled (default Firefox settings):
As I said, I have not changed this setting in Firefox. I assume somebody remoed the blocklist inside FF core. Maybe that was intentional so I report this case that is still broken. I have not yet noticed any other problems so the acceleration seems to work (this is Win XP).

Graphics
Adapter Description	Mobile Intel(R) 4 Series Express Chipset Family
Adapter Drivers	igxprd32
Adapter RAM	Unknown
Device ID	0x2a42
Direct2D Enabled	Blocked for your graphics driver version.
DirectWrite Enabled	false (0.0.0.0)
Driver Date	10-21-2008
Driver Version	6.14.10.5002
GPU #2 Active	false
GPU Accelerated Windows	1/1 Direct3D 9
Vendor ID	0x8086
windowLayerManagerRemote	false
AzureCanvasBackend	skia
AzureContentBackend	none
AzureFallbackCanvasBackend	cairo
AzureSkiaAccelerated	0