Re-think colors.

Color is a property of light, and thus doesn't include information
about transparency.  But canvas pixels and object pigments represent
a color and a degree of transparency.  The new type dmnsn_tcolor/
TColor encapsulates that information.

Also, fix the transparent shadow implementation.

1 files changed, 1 insertions, 1 deletions

diff --git a/libdimension/tests/test_canvas.c b/libdimension/tests/test_canvas.c
index 783914d..73ca1d9 100644
--- a/libdimension/tests/test_canvas.c
+++ b/libdimension/tests/test_canvas.c
@@ -50,7 +50,7 @@ dmnsn_paint_test_canvas(dmnsn_canvas *canvas)
         color = dmnsn_color_from_sRGB(color);
       }
 
-      dmnsn_canvas_set_pixel(canvas, x, y, color);
+      dmnsn_canvas_set_pixel(canvas, x, y, DMNSN_TCOLOR(color));
     }
   }
 }