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// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_RENDER_TREE_FONT_PROVIDER_H_
#define COBALT_RENDER_TREE_FONT_PROVIDER_H_
#include "cobalt/render_tree/font.h"
#include "cobalt/render_tree/glyph.h"
namespace cobalt {
namespace render_tree {
// The FontProvider class is an abstract base class representing a collection of
// fonts with a matching style and size, which provides fonts for any given
// character based upon what it considers to be the best match.
class FontProvider {
public:
// The style of the fonts contained within the collection.
virtual const render_tree::FontStyle& style() const = 0;
// The size of the fonts contained within the collection.
virtual float size() const = 0;
// Returns the font-glyph combination that the FontProvider considers to be
// the best match for the passed in character. The returned font is guaranteed
// to be non-NULL. However, the glyph index may be set to |kInvalidGlyphIndex|
// if the returned font does not provide a glyph for the character.
virtual const scoped_refptr<Font>& GetCharacterFont(
int32 utf32_character, GlyphIndex* glyph_index) = 0;
protected:
virtual ~FontProvider() {}
};
} // namespace render_tree
} // namespace cobalt
#endif // COBALT_RENDER_TREE_FONT_PROVIDER_H_