lua: Add possibility to compare two ImageSpec

src/app/script/image_spec_class.cpp

@@ -1,4 +1,5 @@
 // Aseprite
+// Copyright (c) 2018  Igara Studio S.A.
 // Copyright (C) 2018  David Capello
 //
 // This program is distributed under the terms of
@@ -56,6 +57,14 @@ int ImageSpec_gc(lua_State* L)
   return 0;
 }
 
+int ImageSpec_eq(lua_State* L)
+{
+  auto a = get_obj<doc::ImageSpec>(L, 1);
+  auto b = get_obj<doc::ImageSpec>(L, 2);
+  lua_pushboolean(L, *a == *b);
+  return 1;
+}
+
 int ImageSpec_get_colorMode(lua_State* L)
 {
   const auto spec = get_obj<doc::ImageSpec>(L, 1);
@@ -114,6 +123,7 @@ int ImageSpec_set_transparentColor(lua_State* L)
 
 const luaL_Reg ImageSpec_methods[] = {
   { "__gc", ImageSpec_gc },
+  { "__eq", ImageSpec_eq },
   { nullptr, nullptr }
 };
 

src/doc/image_spec.h

@@ -60,6 +60,19 @@ namespace doc {
       m_height = sz.h;
     }
 
+    bool operator==(const ImageSpec& that) const {
+      return (m_colorMode == that.m_colorMode &&
+              m_width == that.m_width &&
+              m_height == that.m_height &&
+              m_maskColor == that.m_maskColor &&
+              ((!m_colorSpace && !that.m_colorSpace) ||
+               (m_colorSpace && that.m_colorSpace &&
+                m_colorSpace->nearlyEqual(*that.m_colorSpace))));
+    }
+    bool operator!=(const ImageSpec& that) const {
+      return !operator==(that);
+    }
+
   private:
     ColorMode m_colorMode;
     int m_width;