URL:
<https://savannah.gnu.org/bugs/?57335>
Summary: PNG writing support appears to be broken
Project: GNUstep
Submitted by: yavor
Submitted on: Sun 01 Dec 2019 06:54:28 PM EET
Category: Gui/AppKit
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
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Details:
Conversion between the different (supported) image formats is supposed to work
flawlessly, as should be demonstrated with the attached simple program. I
tried it on several GNUstep app icons in TIFF format and it produces unusable
PNG images.
After some investigation it turned out that this is due to the implicit
conversion in NSBitmapImageRep -_PNGRepresentationWithProperties:, due to this
condition (NSBitmapImageRep+PNG.m:325):
+++
if ([self isPlanar] || !(_format & NSAlphaNonpremultipliedBitmapFormat))
----
If I change it to ([self isPlanar]) only then the resulting PNG images are
fine.
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File Attachments:
-------------------------------------------------------
Date: Sun 01 Dec 2019 06:54:28 PM EET Name: foo.m Size: 853B By: yavor
Example program for converting an image to PNG
<http://savannah.gnu.org/bugs/download.php?file_id=47959>
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