| // 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_ |