Albrecht Schlosser wrote:
Mac: looks as if only the checker board background is drawn
and outputs to stderr:
"... <Error>: CGImageCreate: invalid image bits/pixel: 16."
I think that the attached file alpha_mac.diff will fix
the above error on MacOS, but I can't test it right now.
I copied this from fl_draw_image_mac.cxx.
To test it, you need to apply the unittest_images.diff file
from my previous post as well. Anybody, who likes to test it?
These combined patches should solve the alpha drawing issue
for all platforms except the Windows "gray+alpha" case
(STR 2105).
My current opinion is that fl_draw_image() is *not* designed
to draw images with alpha, but this may change again...
http://www.fltk.org/doc-1.1/drawing.html#fl_draw_image
Maybe we could extend the API to achieve correct alpha
drawing as well.
Albrecht
Index: src/Fl_Image.cxx
===================================================================
--- src/Fl_Image.cxx (revision 6771)
+++ src/Fl_Image.cxx (working copy)
@@ -452,7 +452,11 @@
if (H <= 0) return;
if (!id) {
#ifdef __APPLE_QUARTZ__
- CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
+ CGColorSpaceRef lut = 0;
+ if (d()<=2)
+ lut = CGColorSpaceCreateDeviceGray();
+ else
+ lut = CGColorSpaceCreateDeviceRGB();
CGDataProviderRef src = CGDataProviderCreateWithData( 0L, array,
w()*h()*d(), 0L);
id = CGImageCreate( w(), h(), 8, d()*8, ld()?ld():w()*d(),
lut, (d()&1)?kCGImageAlphaNone:kCGImageAlphaLast,
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