The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/layout/base/nsDisplayItemTypes.h	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,72 @@
     1.4 +// IWYU pragma: private, include "nsDisplayList.h"
     1.5 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
     1.6 + * vim: set ts=2 sw=2 et tw=78:
     1.7 + * This Source Code Form is subject to the terms of the Mozilla Public
     1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/.
    1.10 + */
    1.11 +
    1.12 +/**
    1.13 + * It's useful to be able to dynamically check the type of certain items.
    1.14 + * Every subclass of nsDisplayItem must have a new type added here for the purposes
    1.15 + * of easy comparison and matching of items in different display lists.
    1.16 + * 
    1.17 + * This is #included inside nsDisplayItem.
    1.18 + */
    1.19 +
    1.20 +
    1.21 +enum Type {
    1.22 +  TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */
    1.23 +
    1.24 +#define DECLARE_DISPLAY_ITEM_TYPE(name) TYPE_##name,
    1.25 +#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) TYPE_##name,
    1.26 +#include "nsDisplayItemTypesList.h"
    1.27 +#undef DECLARE_DISPLAY_ITEM_TYPE
    1.28 +#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
    1.29 +
    1.30 +  TYPE_MAX
    1.31 +};
    1.32 +
    1.33 +enum {
    1.34 +  // Number of bits needed to represent all types
    1.35 +  TYPE_BITS = 8
    1.36 +};
    1.37 +
    1.38 +enum DisplayItemFlags {
    1.39 +  TYPE_RENDERS_NO_IMAGES = 1 << 0
    1.40 +};
    1.41 +
    1.42 +static const char* DisplayItemTypeName(Type aType)
    1.43 +{
    1.44 +  switch (aType) {
    1.45 +#define DECLARE_DISPLAY_ITEM_TYPE(name) case TYPE_##name: return #name;
    1.46 +#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) case TYPE_##name: return #name;
    1.47 +#include "nsDisplayItemTypesList.h"
    1.48 +#undef DECLARE_DISPLAY_ITEM_TYPE
    1.49 +#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
    1.50 +
    1.51 +    default: return "TYPE_UNKNOWN";
    1.52 +  }
    1.53 +}
    1.54 +
    1.55 +static uint8_t GetDisplayItemFlagsForType(Type aType)
    1.56 +{
    1.57 +  static const uint8_t flags[TYPE_MAX] = {
    1.58 +    0
    1.59 +#define DECLARE_DISPLAY_ITEM_TYPE(name) ,0
    1.60 +#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) ,flags
    1.61 +#include "nsDisplayItemTypesList.h"
    1.62 +#undef DECLARE_DISPLAY_ITEM_TYPE
    1.63 +#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
    1.64 +  };
    1.65 +
    1.66 +  return flags[aType];
    1.67 +}
    1.68 +
    1.69 +static Type GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey)
    1.70 +{
    1.71 +  static const uint32_t typeMask = (1 << TYPE_BITS) - 1;
    1.72 +  Type type = static_cast<Type>(aDisplayItemKey & typeMask);
    1.73 +  NS_ASSERTION(type > TYPE_ZERO && type < TYPE_MAX, "Invalid display item type!");
    1.74 +  return type;
    1.75 +}