commit 1a5d6572e9a699699fba3e9eb5ebbcb18f04994c
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Sun Oct 9 17:42:55 2022 +0200
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Sun Oct 9 17:43:06 2022 +0200

    Fix issue #510: image transparency is not properly processed.

 src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
index ebe7c51..48c6120 100644
--- src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
+++ src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx
@@ -778,7 +778,8 @@ void Fl_Cairo_Graphics_Driver::draw_cached_pattern_(Fl_Image *img, cairo_pattern
   cairo_matrix_init_scale(&matrix, double(img->data_w())/Ws, double(img->data_h())/Hs);
   cairo_matrix_translate(&matrix, -Xs + offset, -Ys + offset);
   cairo_pattern_set_matrix(pat, &matrix);
-  cairo_mask(cairo_, pat);
+  if (img->d() >= 1) cairo_paint(cairo_);
+  else cairo_mask(cairo_, pat);
   cairo_restore(cairo_);
   surface_needs_commit();
 }