Fix behaviour when TrueColor / 24 bit depth is not available (#114)

* Fix regression introduced in c7ca547 which made nsxiv not start in
  non-TrueColor X server.
* Introduce a new fix for embedding into tabbed-alpha. 
* Fixes a visual glitch from original sxiv when drawing transparent images in 8
  bit depth. In 8 bit PseudoColor, `.pixel` is just an index into the 256
  defined colors and thus trying to extract rgb bits from it would result in
  visual glitch. The values `.color.red` on the other hand and so on are always
  integers between 0 and 0xFFFF representing the color as expected.
* Use XColor for win_bg/fg and mrk_fg

Co-authored-by: NRK <nrk@disroot.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/image.c b/image.c
index 0349d12..69f9049 100644
--- a/image.c
+++ b/image.c
@@ -577,7 +577,7 @@ void img_render(img_t *img)
 	int sx, sy, sw, sh;
 	int dx, dy, dw, dh;
 	Imlib_Image bg;
-	unsigned long c;
+	XColor c;
 
 	win = img->win;
 	img_fit(img);
@@ -646,7 +646,7 @@ void img_render(img_t *img)
 			imlib_image_put_back_data(data);
 		} else {
 			c = win->win_bg;
-			imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
+			imlib_context_set_color(c.red >> 8, c.green >> 8, c.blue >> 8, 0xFF);
 			imlib_image_fill_rectangle(0, 0, dw, dh);
 		}
 		imlib_blend_image_onto_image(img->im, 0, sx, sy, sw, sh, 0, 0, dw, dh);