Closed Bug 26997 Opened 25 years ago Closed 25 years ago

16-bit blending doesn't work on Mac

Categories

(Core Graveyard :: GFX, defect, P3)

Product:
Core Graveyard
Component:
GFX
Platform:
PowerPC
Mac System 9.x
Type:
defect

Tracking

(Not tracked)

Status:
VERIFIED FIXED

People

(Reporter: beard, Assigned: dcone)

Details

The Mac represents 16-bit RGB pixels (called direct format) as 5-5-5. It looks to 
me that the 16-bit blender (nsBlender::Do16Blend()) assumes 5-6-5 format. Here's 
the section of Inside Macintosh that talks about this:

http://developer.apple.com/techpubs/mac/QuickDraw/QuickDraw-198.html#HEADING198-
58

Here's the figure that shows the 16-bit pixel format:

http://developer.apple.com/techpubs/mac/QuickDraw/QuickDraw-198.html#MARKER-9-70
I have a fix.  I did not migrate my mac changes to this one particular 
conversion.
Status: NEW → ASSIGNED
Target Milestone: M14
Fixed.. I missed part of the routine that needed some shifts and masks..
Status: ASSIGNED → RESOLVED
Closed: 25 years ago
Resolution: --- → FIXED
Don, what do I need to verify check this bug ? Set monitor to thousands and open 
a sample file ?

Fixed in the Feb 18th build.
Status: RESOLVED → VERIFIED
OS: Mac System 9.x
Product: Core → Core Graveyard
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