The Tor Browser: layout/generic/nsFrameState.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* constants for frame state bits and a type to store them in a uint64_t */

     8 #ifndef nsFrameState_h_

     9 #define nsFrameState_h_

    11 #include <stdint.h>

    13 #ifdef DEBUG

    14 #include "nsString.h"

    16 class nsIFrame;

    17 #endif

    19 typedef uint64_t nsFrameState_size_t;

    21 #define NS_FRAME_STATE_BIT(n_) (nsFrameState(nsFrameState_size_t(1) << (n_)))

    23 #if (_MSC_VER == 1600)

    24 /*

    25  * Visual Studio 2010 has trouble with the sized enum.  Although sized enums

    26  * are supported, two problems arise:

    27  *

    28  *   1. Implicit conversions from the enum type to the equivalently sized

    29  *      integer size are not performed, leading to many compile errors.

    30  *   2. Even with explicit casts added to avoid the errors from (1), odd

    31  *      test failures result, which might well be due to a compiler bug.

    32  *

    33  * So with VS2010 we use consts for the state bits and forgo the increased

    34  * type safety of the enum.  (Visual Studio 2012 has no problem with

    35  * nsFrameState being a sized enum, however.)

    36  */

    38 typedef nsFrameState_size_t nsFrameState;

    40 #define FRAME_STATE_BIT(group_, value_, name_) \

    41 const nsFrameState name_ = NS_FRAME_STATE_BIT(value_);

    42 #include "nsFrameStateBits.h"

    43 #undef FRAME_STATE_BIT

    45 #else

    47 enum nsFrameState : nsFrameState_size_t {

    48 #define FRAME_STATE_BIT(group_, value_, name_) \

    49   name_ = NS_FRAME_STATE_BIT(value_),

    50 #include "nsFrameStateBits.h"

    51 #undef FRAME_STATE_BIT

    52 };

    54 inline nsFrameState operator|(nsFrameState aLeft, nsFrameState aRight)

    55 {

    56   return nsFrameState(nsFrameState_size_t(aLeft) | nsFrameState_size_t(aRight));

    57 }

    59 inline nsFrameState operator&(nsFrameState aLeft, nsFrameState aRight)

    60 {

    61   return nsFrameState(nsFrameState_size_t(aLeft) & nsFrameState_size_t(aRight));

    62 }

    64 inline nsFrameState& operator|=(nsFrameState& aLeft, nsFrameState aRight)

    65 {

    66   aLeft = aLeft | aRight;

    67   return aLeft;

    68 }

    70 inline nsFrameState& operator&=(nsFrameState& aLeft, nsFrameState aRight)

    71 {

    72   aLeft = aLeft & aRight;

    73   return aLeft;

    74 }

    76 inline nsFrameState operator~(nsFrameState aRight)

    77 {

    78   return nsFrameState(~nsFrameState_size_t(aRight));

    79 }

    81 inline nsFrameState operator^(nsFrameState aLeft, nsFrameState aRight)

    82 {

    83   return nsFrameState(nsFrameState_size_t(aLeft) ^ nsFrameState_size_t(aRight));

    84 }

    86 inline nsFrameState& operator^=(nsFrameState& aLeft, nsFrameState aRight)

    87 {

    88   aLeft = aLeft ^ aRight;

    89   return aLeft;

    90 }

    92 #endif

    94 // Bits 20-31 and 60-63 of the frame state are reserved for implementations.

    95 #define NS_FRAME_IMPL_RESERVED                      nsFrameState(0xF0000000FFF00000)

    96 #define NS_FRAME_RESERVED                           ~NS_FRAME_IMPL_RESERVED

    98 namespace mozilla {

    99 #ifdef DEBUG

   100 nsCString GetFrameState(nsIFrame* aFrame);

   101 void PrintFrameState(nsIFrame* aFrame);

   102 #endif

   103 }

   105 #endif /* nsFrameState_h_ */

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