add saveLayer to lua

src/utils/SkLua.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLua.h"
 
 #if SK_SUPPORT_GPU
@@ skipping 597 matching lines @@
 #else
     return 0;
 #endif
 }
 
 static int lcanvas_save(lua_State* L) {
     lua_pushinteger(L, get_ref<SkCanvas>(L, 1)->save());
     return 1;
 }
 
+static int lcanvas_saveLayer(lua_State* L) {
+    SkPaint paint;
+    lua_pushinteger(L, get_ref<SkCanvas>(L, 1)->saveLayer(NULL, lua2OptionalPaint(L, 2, &paint)));
+    return 1;
+}
+
 static int lcanvas_restore(lua_State* L) {
     get_ref<SkCanvas>(L, 1)->restore();
     return 0;
 }
 
 static int lcanvas_scale(lua_State* L) {
     SkScalar sx = lua2scalar_def(L, 2, 1);
     SkScalar sy = lua2scalar_def(L, 3, sx);
     get_ref<SkCanvas>(L, 1)->scale(sx, sy);
     return 0;
@@ skipping 47 matching lines @@
     { "drawPath", lcanvas_drawPath },
     { "drawPicture", lcanvas_drawPicture },
     { "drawText", lcanvas_drawText },
     { "getSaveCount", lcanvas_getSaveCount },
     { "getTotalMatrix", lcanvas_getTotalMatrix },
     { "getClipStack", lcanvas_getClipStack },
 #if SK_SUPPORT_GPU
     { "getReducedClipStack", SkLua::lcanvas_getReducedClipStack },
 #endif
     { "save", lcanvas_save },
+    { "saveLayer", lcanvas_saveLayer },
     { "restore", lcanvas_restore },
     { "scale", lcanvas_scale },
     { "translate", lcanvas_translate },
     { "rotate", lcanvas_rotate },
     { "concat", lcanvas_concat },
 
     { "newSurface", lcanvas_newSurface },
 
     { "__gc", lcanvas_gc },
     { NULL, NULL }
@@ skipping 1204 matching lines @@
     REG_CLASS(L, SkSurface);
     REG_CLASS(L, SkTypeface);
     REG_CLASS(L, SkMatrix);
 }
 
 extern "C" int luaopen_skia(lua_State* L);
 extern "C" int luaopen_skia(lua_State* L) {
     SkLua::Load(L);
     return 0;
 }