1 files changed, 100 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/AttributeMap.h b/gfx/angle/checkout/src/libANGLE/AttributeMap.h
new file mode 100644
index 0000000000..60ba913fe1
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/AttributeMap.h
@@ -0,0 +1,100 @@
+//
+// Copyright 2014 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#ifndef LIBANGLE_ATTRIBUTEMAP_H_
+#define LIBANGLE_ATTRIBUTEMAP_H_
+
+#include "common/FastVector.h"
+#include "common/PackedEnums.h"
+
+#include <EGL/egl.h>
+
+#include <functional>
+#include <vector>
+
+namespace egl
+{
+class Display;
+struct ValidationContext;
+
+// Validates {key, value} for each attribute. Generates an error and returns false on invalid usage.
+using AttributeValidationFunc =
+    std::function<bool(const ValidationContext *, const Display *, EGLAttrib)>;
+
+class AttributeMap final
+{
+  public:
+    static constexpr size_t kMapSize = 2;
+    using Map                        = angle::FlatUnorderedMap<EGLAttrib, EGLAttrib, kMapSize>;
+
+    AttributeMap();
+    AttributeMap(const AttributeMap &other);
+    AttributeMap &operator=(const AttributeMap &other);
+    ~AttributeMap();
+
+    void insert(EGLAttrib key, EGLAttrib value);
+    bool contains(EGLAttrib key) const;
+
+    EGLAttrib get(EGLAttrib key) const;
+    EGLAttrib get(EGLAttrib key, EGLAttrib defaultValue) const;
+    EGLint getAsInt(EGLAttrib key) const;
+    EGLint getAsInt(EGLAttrib key, EGLint defaultValue) const;
+
+    template <typename PackedEnumT>
+    PackedEnumT getAsPackedEnum(EGLAttrib key) const
+    {
+        return FromEGLenum<PackedEnumT>(static_cast<EGLenum>(get(key)));
+    }
+
+    using const_iterator = Map::const_iterator;
+
+    template <typename PackedEnumT>
+    PackedEnumT getAsPackedEnum(EGLAttrib key, PackedEnumT defaultValue) const
+    {
+        const_iterator iter = attribs().find(key);
+        return (attribs().find(key) != attribs().end())
+                   ? FromEGLenum<PackedEnumT>(static_cast<EGLenum>(iter->second))
+                   : defaultValue;
+    }
+
+    bool isEmpty() const;
+    std::vector<EGLint> toIntVector() const;
+
+    const_iterator begin() const;
+    const_iterator end() const;
+
+    [[nodiscard]] bool validate(const ValidationContext *val,
+                                const egl::Display *display,
+                                AttributeValidationFunc validationFunc) const;
+
+    // TODO: remove this and validate at every call site. http://anglebug.com/6671
+    void initializeWithoutValidation() const;
+
+    static AttributeMap CreateFromIntArray(const EGLint *attributes);
+    static AttributeMap CreateFromAttribArray(const EGLAttrib *attributes);
+
+  private:
+    bool isValidated() const;
+
+    const Map &attribs() const
+    {
+        ASSERT(isValidated());
+        return mValidatedAttributes;
+    }
+
+    Map &attribs()
+    {
+        ASSERT(isValidated());
+        return mValidatedAttributes;
+    }
+
+    mutable const EGLint *mIntPointer       = nullptr;
+    mutable const EGLAttrib *mAttribPointer = nullptr;
+    mutable Map mValidatedAttributes;
+};
+}  // namespace egl
+
+#endif  // LIBANGLE_ATTRIBUTEMAP_H_