Test that "sourceSize" fields are generated correctly

When two similar cels from two different sprites with different canvas
size are merged together we have to keep the "sourceSize" of each
original sprite.

cli/sheet.sh

@@ -261,7 +261,8 @@ for layer in a b ; do
 local json = dofile('third_party/json/json.lua')
 local data1 = json.decode(io.open('$d/data1-$layer.json'):read('a'))
 local data2 = json.decode(io.open('$d/data2-$layer.json'):read('a'))
-for i = 1,4 do
+assert(#data1.frames == #data2.frames)
+for i = 1,#data1.frames do
     local a = data1.frames[i].spriteSourceSize
     local b = data2.frames[i].spriteSourceSize
     assert(a.x == b.x)
@@ -272,3 +273,31 @@ end
 EOF
     $ASEPRITE -b -script "$d/compare.lua" || exit 1
 done
+
+# Same problem as in ticket 407 but with "sourceSize" field and
+# different sprites in the same texture atlas.
+d=$t/ticket-407-w-atlas
+$ASEPRITE -b \
+	  -layer a "sprites/point4frames.aseprite" \
+	  "sprites/point2frames.aseprite" \
+	  -data "$d/data1.json" \
+	  -format json-array -sheet "$d/sheet1.png" || exit 1
+$ASEPRITE -b \
+	  -layer a "sprites/point4frames.aseprite" \
+	  "sprites/point2frames.aseprite" \
+	  -trim \
+	  -data "$d/data2.json" \
+	  -format json-array -sheet-pack -sheet "$d/sheet2.png" || exit 1
+cat >$d/compare.lua <<EOF
+local json = dofile('third_party/json/json.lua')
+local data1 = json.decode(io.open('$d/data1.json'):read('a'))
+local data2 = json.decode(io.open('$d/data2.json'):read('a'))
+assert(#data1.frames == #data2.frames)
+for i = 1,#data1.frames do
+    local a = data1.frames[i].sourceSize
+    local b = data2.frames[i].sourceSize
+    assert(a.w == b.w)
+    assert(a.h == b.h)
+end
+EOF
+$ASEPRITE -b -script "$d/compare.lua" || exit 1

sprites/README.md

@@ -19,3 +19,7 @@
   content but different positions, can be used to test
   `-merge-duplicates` to check if all cels go to the same sprite sheet
   position.
+* `point2frames.aseprite`: Indexed, 2 frames, 1 layer, same cel
+  content as in `point4frames.aseprite`. Useful to test if
+  `"sourceSize"` is different when two cels from different sprites are
+  merged in the same texture atlas.