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STR #1703
| Application: | FLTK Library |
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| Status: | 1 - Closed w/Resolution |
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| Priority: | 4 - High, e.g. key functionality not working |
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| Scope: | 3 - Applies to all machines and operating systems |
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| Subsystem: | Core Library |
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| Summary: | alpha compositor fix |
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| Version: | 1.1-current |
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| Created By: | sanel.z |
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| Assigned To: | matt |
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| Fix Version: | 1.1-current (SVN: v5888) |
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| Update Notification: | |
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Trouble Report Files:
No files
Trouble Report Comments:
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| #1 | sanel.z
09:24 Jun 05, 2007 |
| This is fix for 1.1.8 (current svn version) affecting gray images with alpha.
In given versions, alpha compositor filled with grayscale image data will
crash whole app yielding '*** glibc detected *** corrupted double-linked list: xxx'
message.
This is due loop who will overwrite memory node to the next allocated segment,
so []delete will fail. And fix is:
// void alpha_blend(...) Fl_Image.cxx
if (img->d() == 2) {
// Composite grayscale + alpha over RGB...
// Composite RGBA over RGB...
for (int y = H; y > 0; y--, srcptr+=srcskip)
//for (int x = W; x > 0; x--, dstptr+=3) { <-- old
for (int x = W; x > 0; x--) { <-- new
srcg = *srcptr++;
srca = *srcptr++;
...
Before fix you can try it too; with gimp convert some png icon (for example
from crystalsvg theme) to grayscale, retaining alpha channel. Openning it
(eg. with FileChooser (Preview on)) will show crash.
Also, gray images will be drawn correctly after above small fix. | |
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| #2 | matt
10:24 Jun 07, 2007 |
| Fixed in Subversion repository.
Thanks for the patch! | |
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