small

src/pixie/common.nim

@@ -47,9 +47,10 @@ proc toPremultipliedAlpha*(c: Color): Color {.inline.} =
 
 proc toStraightAlpha*(c: Color): Color {.inline.} =
   ## Converts a color to from premultiplied alpha to straight.
-  if c.a == 0:
-    return
-  result.r = c.r / c.a
-  result.g = c.g / c.a
-  result.b = c.b / c.a
-  result.a = c.a
+  if c.a != 0 and c.a != 1:
+    result = c
+  else:
+    result.r = c.r / c.a
+    result.g = c.g / c.a
+    result.b = c.b / c.a
+    result.a = c.a

src/pixie/fileformats/png.nim

@@ -437,10 +437,9 @@ proc encodePng*(
       raise newException(PixieError, "Invalid PNG number of channels")
 
   let data = cast[ptr UncheckedArray[uint8]](data)
-  const signature = [137.uint8, 80, 78, 71, 13, 10, 26, 10]
 
   # Add the PNG file signature
-  result.add(signature)
+  result.add(pngSignature)
 
   # Add IHDR
   result.addUint32(13.uint32.swap())