| // Copyright 2014 The Chromium 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_VERTICAL_POSITION_TYPE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_VERTICAL_POSITION_TYPE_H_ |
| |
| namespace blink { |
| |
| enum class FontVerticalPositionType { |
| // TextTop and TextBottom are the top/bottom of the content area. |
| // This is where 'vertical-align: text-top/text-bottom' aligns to. |
| // This is explicitly undefined in CSS2. |
| // https://drafts.csswg.org/css2/visudet.html#inline-non-replaced |
| TextTop, |
| TextBottom, |
| // Em height as being discussed in Font Metrics API. |
| // https://drafts.css-houdini.org/font-metrics-api-1/#fontmetrics |
| TopOfEmHeight, |
| BottomOfEmHeight |
| }; |
| |
| // Returns whether the position type is CSS "line-over"; i.e., ascender side |
| // or "top" side of a line box. |
| // https://drafts.csswg.org/css-writing-modes-3/#line-over |
| inline bool IsLineOverSide(FontVerticalPositionType type) { |
| return type == FontVerticalPositionType::TextTop || |
| type == FontVerticalPositionType::TopOfEmHeight; |
| } |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_FONTS_FONT_VERTICAL_POSITION_TYPE_H_ |
