AttributeMap.h - mozsearch

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//

// 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_