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opaqueness check

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@5636 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Adam Fedor 1999-12-28 20:26:07 +00:00
parent 4f1dbcfbe8
commit b21f64ae64
2 changed files with 30 additions and 0 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
1999-12-28 Adam Fedor <fedor@gnu.org>
* Source/NSBitmapImageRep.m ([NSBitmapImageRep
-initWithBitmapDataPlanes:...]): Move check for opaqueness to here
from backend.
* Headers/gnustep/gui/DPSOperators.h: New operators colorimage
and alphaimage.
* Headers/gnustep/gui/NSGraphicsContext.h: Likewise.

26
Source/NSBitmapImageRep.m
View file

@ -211,6 +211,32 @@
for (i = 0; i < ((_isPlanar) ? numColors : 1); i++)
imagePlanes[i] = planes[i];
}
if (alpha)
{
unsigned char *bData = (unsigned char*)[self bitmapData];
BOOL allOpaque = YES;
unsigned offset = numColors - 1;
unsigned limit = size.height * size.width;
unsigned i;
for (i = 0; i < limit; i++)
{
unsigned a;
bData += offset;
a = *bData++;
if (a != 255)
{
allOpaque = NO;
break;
}
}
[self setOpaque: allOpaque];
}
else
{
[self setOpaque: YES];
}
return self;
}