Fix tests.

pixie.nimble

@@ -9,3 +9,4 @@ requires "nim >= 1.2.6"
 requires "vmath >= 0.3.2"
 requires "chroma >= 0.1.5"
 requires "zippy >= 0.3.5"
+requires "flatty >= 0.1.1"

src/pixie/fileformats/bmp.nim

@@ -1,4 +1,4 @@
-import ../images, flatty/binny, flatty/hexPrint, chroma, sequtils, print
+import ../images, flatty/binny, chroma
 
 # See: https://en.wikipedia.org/wiki/BMP_file_format
 

src/pixie/images.nim

@@ -228,6 +228,16 @@ proc getRgbaSmooth*(image: Image, x, y: float64): ColorRGBA
 
   return finalMix.rgba()
 
+proc hasEffect*(blendMode: BlendMode, rgba: ColorRGBA): bool =
+  ## Returns true if applying rgba with current blend mode has effect.
+  case blendMode
+  of Mask:
+    rgba.a != 255
+  of COPY:
+    true
+  else:
+    rgba.a > 0
+
 proc draw*(destImage: Image, srcImage: Image, mat: Mat4, blendMode = Normal) =
   ## Draws one image onto another using matrix with color blending.
   var srcImage = srcImage

tests/testbmp.nim

@@ -13,7 +13,7 @@ block:
   image[2, 1] = rgba(255, 0, 0, 127)
   image[3, 1] = rgba(255, 255, 255, 127)
 
-  writeFile("images/bmp/test4x2.bmp", encodeBmp(image))
+  writeFile("tests/images/bmp/test4x2.bmp", encodeBmp(image))
 
   var image2 = decodeBmp(encodeBmp(image))
   doAssert image2.width == image.width
@@ -23,7 +23,7 @@ block:
 block:
   var image = newImage(16, 16)
   image.fill(rgba(255, 0, 0, 127))
-  writeFile("images/bmp/test16x16.bmp", encodeBmp(image))
+  writeFile("tests/images/bmp/test16x16.bmp", encodeBmp(image))
 
   var image2 = decodeBmp(encodeBmp(image))
   doAssert image2.width == image.width
@@ -32,5 +32,5 @@ block:
 
 block:
   for bits in [32, 24]:
-    var image = decodeBmp(readFile("images/bmp/knight." & $bits & ".master.bmp"))
-    writeFile("images/bmp/knight." & $bits & ".bmp", encodeBmp(image))
+    var image = decodeBmp(readFile("tests/images/bmp/knight." & $bits & ".master.bmp"))
+    writeFile("tests/images/bmp/knight." & $bits & ".bmp", encodeBmp(image))