widget/nsCUPSShim.h

   1 /* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ex: set tabstop=8 softtabstop=2 shiftwidth=2 expandtab: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsCUPSShim_h___
   8 #define nsCUPSShim_h___
   9
  10 #include <cups/cups.h>
  11 #include "mozilla/Atomics.h"
  12 #include "mozilla/Mutex.h"
  13
  14 // TODO: This should be a configure option, ideally.
  15 #ifndef XP_MACOSX
  16 #  define CUPS_SHIM_RUNTIME_LINK
  17 #endif
  18
  19 struct PRLibrary;
  20
  21 class nsCUPSShim {
  22  public:
  23 #ifdef CUPS_SHIM_RUNTIME_LINK
  24   nsCUPSShim();
  25   bool InitOkay() { return mInitOkay; }
  26 #else
  27   nsCUPSShim() = default;
  28   bool InitOkay() { return true; }
  29 #endif
  30
  31   /**
  32    * Function pointers for supported functions. These are only
  33    * valid after successful initialization.
  34    */
  35 #define CUPS_SHIM_ALL_FUNCS(X) \
  36   X(cupsAddOption)             \
  37   X(cupsCheckDestSupported)    \
  38   X(cupsConnectDest)           \
  39   X(cupsCopyDest)              \
  40   X(cupsCopyDestInfo)          \
  41   X(cupsDoRequest)             \
  42   X(cupsEnumDests)             \
  43   X(cupsFindDestDefault)       \
  44   X(cupsFreeDestInfo)          \
  45   X(cupsFreeDests)             \
  46   X(cupsGetDestMediaDefault)   \
  47   X(cupsGetDestMediaCount)     \
  48   X(cupsGetDestMediaByIndex)   \
  49   X(cupsGetDestMediaByName)    \
  50   X(cupsGetDest)               \
  51   X(cupsGetDests)              \
  52   X(cupsGetNamedDest)          \
  53   X(cupsGetOption)             \
  54   X(cupsLocalizeDestMedia)     \
  55   X(cupsPrintFile)             \
  56   X(cupsTempFd)                \
  57   X(httpClose)                 \
  58   X(ippAddString)              \
  59   X(ippAddStrings)             \
  60   X(ippDelete)                 \
  61   X(ippFindAttribute)          \
  62   X(ippGetCount)               \
  63   X(ippGetString)              \
  64   X(ippNewRequest)
  65
  66 #ifdef CUPS_SHIM_RUNTIME_LINK
  67   // Define a single field which holds a function pointer.
  68 #  define CUPS_SHIM_FUNC_DECL(X) decltype(::X)* X = nullptr;
  69 #else
  70   // Define a static constexpr function pointer. GCC can sometimes optimize
  71   // away the pointer fetch for this.
  72 #  define CUPS_SHIM_FUNC_DECL(X) static constexpr decltype(::X)* const X = ::X;
  73 #endif
  74
  75   CUPS_SHIM_ALL_FUNCS(CUPS_SHIM_FUNC_DECL)
  76 #undef CUPS_SHIM_FUNC_DECL
  77
  78 #ifdef CUPS_SHIM_RUNTIME_LINK
  79  private:
  80   bool mInitOkay = false;
  81   PRLibrary* mCupsLib = nullptr;
  82 #endif
  83 };
  84
  85 #endif /* nsCUPSShim_h___ */