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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | ||
| 0006436 | [JEDI VCL] JclGraphics | crash | always | 2015-09-08 09:47 | 2016-08-03 20:23 | ||
| Reporter | CubicDesign | View Status | public | ||||
| Assigned To | AHUser | ||||||
| Priority | normal | Resolution | fixed | ||||
| Status | resolved | Product Version | Version 2.5 (Subversion repository/Daily zips) | ||||
| Summary | 0006436: Crash in JvPaintFX.pas | ||||||
| Description |
The person that added JanFX library to JEDI removed a {$R-} directive without really understanding what it is doing. Without this directive the code crashes. |
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| Additional Information |
The problem is class procedure TJvPaintFX.Stretch(Src, Dst: TBitmap; Filter: TFilterProc; AWidth: Single); begin ... GetMem(Contrib, DstWidth * SizeOf(TCList)); // Horizontal sub-sampling // Scales from bigger to smaller Width {$R-} <------------------ THIS WAS REMOVED!!!!! if (xscale < 1.0) then ... end; This will explain why that range check should be disabled: http://stackoverflow.com/questions/628965/delphi-accessing-data-from-dynamic-array-that-is-populated-from-an-untyped-poi [^] |
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| Tags | bug, janfx, JvPaintFX, resampler, stretch | ||||||
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Notes |
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(0021206) CubicDesign (reporter) 2015-09-14 21:21 |
To reproduce it, simply call TJvPaintFX.Stretch. It is amazing that nobody reported this until now. |
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(0021307) AHUser (developer) 2016-08-02 19:23 |
All JVCL files are compiled with $R- (first compiler directive in jvcl.inc). So I don't see how that code could be compiled with $R+ unless you copy that part into your own unit. |
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(0021309) CubicDesign (reporter) 2016-08-02 20:00 |
> are compiled with $R- That is BAAAAD! During debugging and testing Range Checking should ALWAYS be on. > unless you copy that part into your own unit Yes. This is what I do (and I know for sure at least 3 friends that are doing the same). I don't like having the whole Jedi installed because it is too big, so I only use what I need from it. Any person that will use ONLY that piece of code will have the same problem. If in the future Jedi will (hopefully) change the R- to R+ that code will fail also in Jedi. So, why deleting that single line of code if it does NO harm when it is there and LOT of harm when is removed? |
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(0021316) AHUser (developer) 2016-08-03 17:23 |
My guess it that the person who integrated TJvPaintFX thought that due to the global $R- that it isn't necessary. I found some more "array[0..0] of T" type declaration in the JCL/JVCL. The Delphi RTL changed them years ago to "array[0..MaxInt div SizeOf(T) - 1] of T". That's what I'm going to do to fix this. BTW: Why is TJvPaintFX a component anyway, it should be moved to the JCL and made an abstract class. But I guess it is a bit too late for that, especially with nobody actively working on the JCL/JVCL. |
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(0021317) AHUser (developer) 2016-08-03 20:23 |
Fixed in master branch. I also moved the JvResample.pas to \archive because all its code is a copy of JvPaintFX (with some style guide changes). |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2015-09-08 09:47 | CubicDesign | New Issue | |
| 2015-09-08 09:47 | CubicDesign | IDE version | => Delphi/C++Builder XE3 |
| 2015-09-11 16:28 | CubicDesign | Tag Attached: janfx | |
| 2015-09-11 16:28 | CubicDesign | Tag Attached: resampler | |
| 2015-09-11 16:29 | CubicDesign | Tag Attached: bug | |
| 2015-09-11 16:29 | CubicDesign | Tag Attached: JvPaintFX | |
| 2015-09-11 16:29 | CubicDesign | Tag Attached: stretch | |
| 2015-09-14 21:21 | CubicDesign | Note Added: 0021206 | |
| 2016-08-02 19:17 | AHUser | Project | JEDI Code Library => JEDI VCL |
| 2016-08-02 19:23 | AHUser | Note Added: 0021307 | |
| 2016-08-02 19:23 | AHUser | Status | new => feedback |
| 2016-08-02 20:00 | CubicDesign | Note Added: 0021309 | |
| 2016-08-03 17:23 | AHUser | Note Added: 0021316 | |
| 2016-08-03 20:23 | AHUser | Note Added: 0021317 | |
| 2016-08-03 20:23 | AHUser | Status | feedback => resolved |
| 2016-08-03 20:23 | AHUser | Fixed in Version | => Daily / GIT |
| 2016-08-03 20:23 | AHUser | Resolution | open => fixed |
| 2016-08-03 20:23 | AHUser | Assigned To | => AHUser |
| 2016-08-04 21:17 | AHUser | Relationship added | duplicate of 0006241 |
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