Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef PPAPI_CPP_RESOURCE_H_ |
| 6 | #define PPAPI_CPP_RESOURCE_H_ |
| 7 | |
| 8 | #include "ppapi/c/pp_resource.h" |
| 9 | #include "ppapi/cpp/instance_handle.h" |
| 10 | #include "ppapi/cpp/pass_ref.h" |
| 11 | |
| 12 | /// @file |
| 13 | /// This file defines a <code>Resource</code> type representing data associated |
| 14 | /// with the module. |
| 15 | namespace pp { |
| 16 | |
Torne (Richard Coles) | 5d1f7b1 | 2014-02-21 12:16:55 +0000 | [diff] [blame] | 17 | class Var; |
Torne (Richard Coles) | 0f1bc08 | 2013-11-06 12:27:47 +0000 | [diff] [blame] | 18 | |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 19 | /// A reference counted module resource. |
| 20 | class Resource { |
| 21 | public: |
| 22 | /// The default constructor. |
| 23 | Resource(); |
| 24 | |
| 25 | /// A constructor for copying a resource. |
| 26 | /// |
| 27 | /// @param[in] other A <code>Resource</code>. |
| 28 | Resource(const Resource& other); |
| 29 | |
| 30 | /// Destructor. |
| 31 | virtual ~Resource(); |
| 32 | |
| 33 | /// This function assigns one <code>Resource</code> to another |
| 34 | /// <code>Resource</code>. |
| 35 | /// |
| 36 | /// @param[in] other A Resource. |
| 37 | /// |
| 38 | /// @return A Resource containing the assigned Resource. |
| 39 | Resource& operator=(const Resource& other); |
| 40 | |
| 41 | /// This functions determines if this resource is invalid or |
| 42 | /// uninitialized. |
| 43 | /// |
| 44 | /// @return true if this resource is invalid or uninitialized. |
| 45 | bool is_null() const { return !pp_resource_; } |
| 46 | |
| 47 | PP_Resource pp_resource() const { return pp_resource_; } |
| 48 | |
| 49 | /// This function releases ownership of this resource and returns it to the |
| 50 | /// caller. |
| 51 | /// |
| 52 | /// Note that the reference count on the resource is unchanged and the caller |
| 53 | /// needs to release the resource. |
| 54 | /// |
| 55 | /// @return The detached <code>PP_Resource</code>. |
| 56 | PP_Resource detach(); |
| 57 | |
| 58 | protected: |
| 59 | /// A constructor used when a <code>PP_Resource</code> is provided as a |
| 60 | /// return value whose reference count we need to increment. |
| 61 | /// |
| 62 | /// @param[in] resource A <code>PP_Resource</code> corresponding to a |
| 63 | /// resource. |
| 64 | explicit Resource(PP_Resource resource); |
| 65 | |
| 66 | /// Constructor used when a <code>PP_Resource</code> already has a ref count |
| 67 | /// assigned. Add additional refcount is not taken. |
| 68 | Resource(PassRef, PP_Resource resource); |
| 69 | |
| 70 | /// PassRefFromConstructor is called by derived class' constructors to |
| 71 | /// initialize this <code>Resource</code> with a <code>PP_Resource</code> |
| 72 | /// that has already had its reference count incremented by |
| 73 | /// <code>Core::AddRefResource</code>. It also assumes this object has no |
| 74 | /// current resource. |
| 75 | /// |
| 76 | /// The intended usage of this function that the derived class constructor |
| 77 | /// will call the default <code>Resource</code> constructor, then make a call |
| 78 | /// to create a resource. It then wants to assign the new resource (which, |
| 79 | /// since it was returned by the browser, already had its reference count |
| 80 | /// increased). |
| 81 | /// |
| 82 | /// @param[in] resource A <code>PP_Resource</code> corresponding to a |
| 83 | /// resource. |
| 84 | void PassRefFromConstructor(PP_Resource resource); |
| 85 | |
Torne (Richard Coles) | 0f1bc08 | 2013-11-06 12:27:47 +0000 | [diff] [blame] | 86 | /// Sets this resource to null. This releases ownership of the resource. |
| 87 | void Clear(); |
| 88 | |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 89 | private: |
Torne (Richard Coles) | 5d1f7b1 | 2014-02-21 12:16:55 +0000 | [diff] [blame] | 90 | friend class Var; |
Torne (Richard Coles) | 0f1bc08 | 2013-11-06 12:27:47 +0000 | [diff] [blame] | 91 | |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 92 | PP_Resource pp_resource_; |
| 93 | }; |
| 94 | |
| 95 | } // namespace pp |
| 96 | |
| 97 | inline bool operator==(const pp::Resource& lhs, const pp::Resource& rhs) { |
| 98 | return lhs.pp_resource() == rhs.pp_resource(); |
| 99 | } |
| 100 | |
| 101 | inline bool operator!=(const pp::Resource& lhs, const pp::Resource& rhs) { |
| 102 | return !(lhs == rhs); |
| 103 | } |
| 104 | |
| 105 | #endif // PPAPI_CPP_RESOURCE_H_ |