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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
commit2aa4a82499d4becd2284cdb482213d541b8804dd (patch)
treeb80bf8bf13c3766139fbacc530efd0dd9d54394c /gfx/2d/UserData.h
parentInitial commit. (diff)
downloadfirefox-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.h138
1 files changed, 138 insertions, 0 deletions
diff --git a/gfx/2d/UserData.h b/gfx/2d/UserData.h
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+/* -*- 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_ */