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ID Category Severity Reproducibility Date Submitted Last Update
0007407 [Squeak] VM major always 10-26-09 12:50 04-18-10 21:51
Reporter jmvuletich View Status public  
Assigned To lewis
Priority normal Resolution fixed  
Status closed   Product Version
Summary 0007407: BitBlt. Incorrect alpha values for several rules.
Description The alpha of the result is wrong in rgbAdd, rgbSub, rgbMax, rgbMin and rgbMinInvert. The main problem is that all the words inBitBlt are treated as int and not as unsigned int. This does not affect most operations, but it does affect comparisions when the most significant bit is 1 (i.e., the leftmost bit in alpha in 32bpp Forms). A second problem is that in C, integer aritmethic overflows silently. This affected rgbAdd.
Additional Information Test and Fix included.
+ BitBlt-Tests-jmv-M7407.cs includes the tests and should be loaded in Trunk.
+ VMMaker-BitBltSimulationTests-jmv-M7407.cs includes tests that are specific to VMMaker and should be part of it.
+ VMMaker-BitBlt-AlphaFixes-jmv-M7407.cs is the fixes (for VMMaker).
+ VMMakerCodeGenerationFix-jmv-M7407.cs is a fix for VMMaker.
Attached Files  BitBlt-Tests-jmv-M7407.cs [^] (6,716 bytes) 10-26-09 12:51
 VMMaker-BitBltSimulationTests-jmv-M7407.cs [^] (1,905 bytes) 10-26-09 12:52
 VMMaker-BitBlt-AlphaFixes-jmv-M7407.cs [^] (6,415 bytes) 10-26-09 12:52
 VMMakerCodeGenerationFix-jmv-M7407.cs [^] (858 bytes) 10-26-09 12:53

- Relationships

- Notes
(0013371 - 658 - 682 - 682 - 682 - 682 - 682)
lewis
10-30-09 01:47

 The six new tests for BitBltTest have been added to Squeak trunk. The two simulation tests have been added to VMMaker, but should not be removed from trunk until perhaps six months from now (because not everyone is using the same VMMaker package).

VMMaker is updated with VMMaker-BitBltSimulationTests-jmv-M7407.cs and VMMakerCodeGenerationFix-jmv-M7407.cs, plus additional updates from BitBltTweaks.1.cs from Juan on vm-dev mailing list.

The fixes in VMMaker-BitBlt-AlphaFixes-jmv-M7407.cs look right to me, and they fix the documented bugs. I have not yet applied them to VMMaker in case there are other comments or fixes (Eliot mentioned Cog fixes).
 
(0013376 - 312 - 324 - 324 - 324 - 324 - 324)
lewis
11-02-09 11:51

 VMMaker-BitBlt-AlphaFixes-jmv-M7407.cs and VMMakerCodeGenerationFix-jmv-M7407.cs are in VMMaker-dtl.147 on SqueakSource. All fixes and tests are now in Squeak trunk and VMMaker.

Remaining open issue: Remove tests from BitBltTest (moved to BitBltSimulation in VMMaker), but wait a few months before doing this.
 
(0013700 - 53 - 53 - 53 - 53 - 53 - 53)
laza
04-13-10 12:37

 According to the tests this has been fixed in all VMs
 

- Issue History
Date Modified Username Field Change
10-26-09 12:50 jmvuletich New Issue
10-26-09 12:50 jmvuletich Status new => assigned
10-26-09 12:50 jmvuletich Assigned To  => lewis
10-26-09 12:51 jmvuletich File Added: BitBlt-Tests-jmv-M7407.cs
10-26-09 12:52 jmvuletich File Added: VMMaker-BitBltSimulationTests-jmv-M7407.cs
10-26-09 12:52 jmvuletich File Added: VMMaker-BitBlt-AlphaFixes-jmv-M7407.cs
10-26-09 12:53 jmvuletich File Added: VMMakerCodeGenerationFix-jmv-M7407.cs
10-26-09 12:55 jmvuletich Additional Information Updated
10-27-09 00:15 lewis Issue Monitored: lewis
10-30-09 01:47 lewis Note Added: 0013371
11-02-09 11:51 lewis Note Added: 0013376
11-02-09 11:51 lewis Status assigned => testing
04-13-10 12:37 laza Status testing => resolved
04-13-10 12:37 laza Fixed in Version  => trunk
04-13-10 12:37 laza Resolution open => fixed
04-13-10 12:37 laza Note Added: 0013700
04-18-10 21:51 andreas Status resolved => closed

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