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Side by Side Diff: gpu/command_buffer/service/path_manager.h

Issue 169403005: command_buffer: Implement path rendering functions for CHROMIUM_path_rendering (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@nv-pr-02-texgen
Patch Set: Created 5 years, 6 months ago
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1 // Copyright (c) 2015 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 GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_
6 #define GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_
7
8 #include <map>
9
10 #include "base/basictypes.h"
11 #include "gpu/command_buffer/service/gl_utils.h"
12 #include "gpu/gpu_export.h"
13
14 namespace gpu {
15 namespace gles2 {
16
17 // This class keeps track of paths and their client and service ids
18 // so we can correctly clear them.
19 class GPU_EXPORT PathManager {
20 public:
21 PathManager();
22 ~PathManager();
23
24 // Must call before destruction.
25 void Destroy(bool have_context);
26
27 // Creates a path mapping between closed intervals
28 // [first_client_id, last_client_id] -> [first_service_id, ...].
29 void CreatePathRange(GLuint first_client_id,
30 GLuint last_client_id,
31 GLuint first_service_id);
32
33 // Returns true if any path exists in the closed interval
34 // [first_client_id, last_client_id].
35 bool HasPathsInRange(GLuint first_client_id, GLuint last_client_id) const;
36
37 // Gets the path id corresponding the client path id.
38 // Returns false if no such service path id was not found.
39 bool GetPath(GLuint client_id, GLuint* service_id) const;
40
41 // Removes a closed interval of paths [first_client_id, last_client_id].
42 void RemovePaths(GLuint first_client_id, GLuint last_client_id);
43
44 private:
45 // Mapping between client id and service id.
46 // Should be used only by the implementation.
47 struct PathRangeDescription {
48 PathRangeDescription(GLuint last_client, GLuint first_service)
49 : last_client_id(last_client), first_service_id(first_service) {}
50 GLuint last_client_id;
51 GLuint first_service_id;
52 typedef GLuint ServiceIdType;
53 };
54 typedef std::map<GLuint, PathRangeDescription> PathRangeMap;
55
56 template <typename RangeIterator>
57 static GLuint RangeSize(const RangeIterator& it) {
58 return it->second.last_client_id - it->first + 1;
59 }
60 template <typename RangeIterator>
61 static GLuint FirstClientId(const RangeIterator& it) {
62 return it->first;
63 }
64 template <typename RangeIterator>
65 static GLuint FirstServiceId(const RangeIterator& it) {
66 return it->second.first_service_id;
67 }
68 template <typename RangeIterator>
69 static GLuint LastServiceId(const RangeIterator& it) {
70 return FirstServiceId(it) + RangeSize(it) - 1;
71 }
72 static GLuint LastClientId(PathManager::PathRangeMap::const_iterator& it) {
73 return it->second.last_client_id;
74 }
75 // Note: this one can be assigned to.
76 static GLuint& LastClientId(PathManager::PathRangeMap::iterator& it) {
77 return it->second.last_client_id;
78 }
79
80 template <typename T>
81 struct IteratorSelector {
82 typedef typename T::iterator iterator;
83 };
84 template <typename T>
85 struct IteratorSelector<const T> {
86 typedef typename T::const_iterator iterator;
87 };
88
89 // Returns the range position that contains |client_id| or
90 // |PathRangeMap::iterator::end()| if |client_id| is not found.
91 template <typename MapType>
92 static typename IteratorSelector<MapType>::iterator GetContainingRange(
93 MapType& path_map,
94 GLuint client_id);
95
96 // Returns the range position that contains |client_id|. If that is
97 // not available, returns the range that has smallest
98 // |first_client_id| that is bigger than |client_id|. Returns
99 // |PathRangeMap::iterator::end()| if there is no such range.
100 template <typename MapType>
101 static typename IteratorSelector<MapType>::iterator GetContainingOrNextRange(
102 MapType& path_map,
103 GLuint client_id);
104
105 // Checks for consistency inside the book-keeping structures. Used as
106 // DCHECK pre/post condition in mutating functions.
107 bool CheckConsistency();
108
109 PathRangeMap path_map_;
110
111 DISALLOW_COPY_AND_ASSIGN(PathManager);
112 };
113
114 } // namespace gles2
115 } // namespace gpu
116
117 #endif // GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_
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