URL:
<http://savannah.gnu.org/bugs/?34740>
Summary: gnustep has problems with PNGs that have a sRGB
colorspace
Project: GNUstep
Submitted by: julian_
Submitted on: Do 03 Nov 2011 18:40:29 GMT
Category: Gui/AppKit
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
i've problem with gnustep and PNGs in sRGB colorspace.
i do not know if these pictures display fine e.g. in NSImageViews, but i know
that obtaining raw pixel data from sRGB-PNG => NSImage => NSBitmapImageRep =>
bitmapData is broken.
i am using the following code for extracting raw pixel data out of PNGs and it
works fine for the attached picture OK.png (256x256) but not for the picture
BUG.png (256x256, sRGB):
NSImage *theImg = [[NSImage alloc] initWithContentsOfURL:_url];
NSBitmapImageRep *bitmap = [NSBitmapImageRep alloc];
NSSize imgSize = [theImg size];
width = imgSize.width;
height = imgSize.height;
NSImageRep *rep = [theImg bestRepresentationForDevice: nil];
[theImg lockFocus];
[rep drawInRect:NSMakeRect(0,0,[theImg size].width, [theImg
size].height)];
[bitmap initWithFocusedViewRect:NSMakeRect(0.0, 0.0,
imgSize.width, imgSize.height)];
[theImg unlockFocus];
int bpp = [bitmap bitsPerPixel] / 8;
const int rowsize = width * bpp;
_data = (char *)calloc( rowsize * height, 1);
memcpy(_data, [bitmap bitmapData], width * bpp * height);
if you want i can create a more complete test-case e.g. a full application
that loads two 2x2 PNGs but i am not sure this is necessary and it would take
some time
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Do 03 Nov 2011 18:40:29 GMT Name: OK.png Size: 16kB By: julian_
<http://savannah.gnu.org/bugs/download.php?file_id=24293>
-------------------------------------------------------
Date: Do 03 Nov 2011 18:40:29 GMT Name: BUG.png Size: 34kB By: julian_
<http://savannah.gnu.org/bugs/download.php?file_id=24294>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?34740>
_______________________________________________
Nachricht geschickt von/durch Savannah
http://savannah.gnu.org/
_______________________________________________
Bug-gnustep mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/bug-gnustep
