Add Image:resize() test

scripts/image.lua

@@ -4,6 +4,8 @@
 -- This file is released under the terms of the MIT license.
 -- Read LICENSE.txt for more information.
 
+dofile('./test_utils.lua')
+
 local rgba = app.pixelColor.rgba
 
 local a = Image(32, 64)
@@ -92,3 +94,59 @@ do
     end
   end
 end
+
+-- Resize image
+do
+  local a = Sprite(3, 2)
+  local cel = a.cels[1]
+  assert(cel.bounds == Rectangle(0, 0, 3, 2))
+  local img = cel.image
+  local cols = { rgba(10, 60, 1), rgba(20, 50, 2), rgba(30, 40, 3),
+                 rgba(40, 30, 4), rgba(50, 20, 5), rgba(60, 10, 6) }
+  array_to_pixels(cols, img)
+  expect_img(img, cols)
+
+  -- Test resize of a cel with origin=0,0
+
+  img:resize(img.width*2, img.height*2)
+
+  expect_eq(cel.bounds, Rectangle(0, 0, 6, 4))
+  expect_eq(img.width, 6)
+  expect_eq(img.height, 4)
+  local cols2 = { cols[1],cols[1], cols[2],cols[2], cols[3],cols[3],
+                  cols[1],cols[1], cols[2],cols[2], cols[3],cols[3],
+                  cols[4],cols[4], cols[5],cols[5], cols[6],cols[6],
+                  cols[4],cols[4], cols[5],cols[5], cols[6],cols[6] }
+  expect_img(img, cols2)
+
+  -- Undo
+  function undo()
+    app.undo()
+    img = cel.image -- TODO img shouldn't be invalidated, the resize operation should kept the image ID
+  end
+  undo()
+
+  -- Test a resize when cel origin > 0,0
+  cel.position = Point(2, 1)
+  expect_eq(cel.bounds, Rectangle(2, 1, 3, 2))
+  expect_img(img, cols)
+  img:resize{ width=6, height=4 }
+  expect_eq(cel.bounds, Rectangle(2, 1, 6, 4)) -- Position is not modified
+  expect_eq(img.width, 6)
+  expect_eq(img.height, 4)
+
+  undo()
+  img:resize{ size=Size(6, 4), pivot=Point(1, 1) }
+  expect_eq(cel.bounds, Rectangle(1, 0, 6, 4))
+
+  undo()
+  img:resize{ size=Size(6, 4), pivot=Point(3, 2) }
+  expect_eq(cel.bounds, Rectangle(-1, -1, 6, 4))
+
+  -- Test resize without cel
+
+  local img2 = Image(img)
+  expect_img(img2, cols2)
+  img2:resize(3, 2)
+  expect_img(img2, cols)
+end