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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /gfx/2d/UserData.h | |
parent | Initial commit. (diff) | |
download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/2d/UserData.h')
-rw-r--r-- | gfx/2d/UserData.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/gfx/2d/UserData.h b/gfx/2d/UserData.h new file mode 100644 index 0000000000..b5c5cc51c3 --- /dev/null +++ b/gfx/2d/UserData.h @@ -0,0 +1,138 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef MOZILLA_GFX_USERDATA_H_ +#define MOZILLA_GFX_USERDATA_H_ + +#include <stdlib.h> +#include "Types.h" +#include "mozilla/Assertions.h" + +namespace mozilla { +namespace gfx { + +struct UserDataKey { + int unused; +}; + +/* this class is basically a clone of the user data concept from cairo */ +class UserData { + typedef void (*destroyFunc)(void* data); + + public: + UserData() : count(0), entries(nullptr) {} + + /* Attaches untyped userData associated with key. destroy is called on + * destruction */ + void Add(UserDataKey* key, void* userData, destroyFunc destroy) { + for (int i = 0; i < count; i++) { + if (key == entries[i].key) { + if (entries[i].destroy) { + entries[i].destroy(entries[i].userData); + } + entries[i].userData = userData; + entries[i].destroy = destroy; + return; + } + } + + // We could keep entries in a std::vector instead of managing it by hand + // but that would propagate an stl dependency out which we'd rather not + // do (see bug 666609). Plus, the entries array is expect to stay small + // so doing a realloc everytime we add a new entry shouldn't be too costly + entries = + static_cast<Entry*>(realloc(entries, sizeof(Entry) * (count + 1))); + + if (!entries) { + MOZ_CRASH("GFX: UserData::Add"); + } + + entries[count].key = key; + entries[count].userData = userData; + entries[count].destroy = destroy; + + count++; + } + + /* Remove and return user data associated with key, without destroying it */ + void* Remove(UserDataKey* key) { + for (int i = 0; i < count; i++) { + if (key == entries[i].key) { + void* userData = entries[i].userData; + // decrement before looping so entries[i+1] doesn't read past the end: + --count; + for (; i < count; i++) { + entries[i] = entries[i + 1]; + } + return userData; + } + } + return nullptr; + } + + /* Remove and destroy a given key */ + void RemoveAndDestroy(UserDataKey* key) { + for (int i = 0; i < count; i++) { + if (key == entries[i].key) { + if (entries[i].destroy) { + entries[i].destroy(entries[i].userData); + } + // decrement before looping so entries[i+1] doesn't read past the end: + --count; + for (; i < count; i++) { + entries[i] = entries[i + 1]; + } + } + } + } + + /* Retrives the userData for the associated key */ + void* Get(UserDataKey* key) const { + for (int i = 0; i < count; i++) { + if (key == entries[i].key) { + return entries[i].userData; + } + } + return nullptr; + } + + bool Has(UserDataKey* key) { + for (int i = 0; i < count; i++) { + if (key == entries[i].key) { + return true; + } + } + return false; + } + + void Destroy() { + for (int i = 0; i < count; i++) { + if (entries[i].destroy) { + entries[i].destroy(entries[i].userData); + } + } + free(entries); + entries = nullptr; + count = 0; + } + + ~UserData() { Destroy(); } + + private: + struct Entry { + const UserDataKey* key; + void* userData; + destroyFunc destroy; + }; + + int count; + Entry* entries; +}; + +} // namespace gfx +} // namespace mozilla + +#endif /* MOZILLA_GFX_USERDATA_H_ */ |