| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. |
| * All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_FONT_SIZE_FUNCTIONS_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_FONT_SIZE_FUNCTIONS_H_ |
| |
| #include <optional> |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/css_value_keywords.h" |
| #include "third_party/blink/renderer/platform/fonts/font_size_adjust.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| namespace blink { |
| |
| class Document; |
| class FontDescription; |
| class SimpleFontData; |
| |
| enum ApplyMinimumFontSize { |
| kDoNotApplyMinimumForFontSize, |
| kApplyMinimumForFontSize |
| }; |
| |
| class CORE_EXPORT FontSizeFunctions { |
| STATIC_ONLY(FontSizeFunctions); |
| |
| public: |
| static float GetComputedSizeFromSpecifiedSize( |
| const Document*, |
| float zoom_factor, |
| bool is_absolute_size, |
| float specified_size, |
| ApplyMinimumFontSize = kApplyMinimumForFontSize); |
| |
| // Given a CSS keyword in the range (xx-small to xxx-large), this function |
| // returns values from '1' to '8'. |
| static unsigned KeywordSize(CSSValueID value_id) { |
| DCHECK(IsValidValueID(value_id)); |
| |
| if (value_id == CSSValueID::kWebkitXxxLarge) { |
| value_id = CSSValueID::kXxxLarge; |
| } |
| |
| return static_cast<int>(value_id) - static_cast<int>(CSSValueID::kXxSmall) + |
| 1; |
| } |
| |
| static bool IsValidValueID(CSSValueID value_id) { |
| return (value_id >= CSSValueID::kXxSmall && |
| value_id <= CSSValueID::kXxxLarge) || |
| value_id == CSSValueID::kWebkitXxxLarge; |
| } |
| |
| static CSSValueID InitialValueID() { return CSSValueID::kMedium; } |
| static unsigned InitialKeywordSize() { return KeywordSize(InitialValueID()); } |
| |
| // Given a keyword size in the range (1 to 8), this function will return |
| // the correct font size scaled relative to the user's default (4). |
| static float FontSizeForKeyword(const Document*, |
| unsigned keyword, |
| bool is_monospace); |
| |
| // Given a font size in pixel, this function will return legacy font size |
| // between 1 and 7. |
| static int LegacyFontSize(const Document*, |
| int pixel_font_size, |
| bool is_monospace); |
| |
| // Given font data, this function returns a normalized aspect value for the |
| // specified font metric, which is calculated using the size of the font |
| // metric divided by the font size. |
| // https://www.w3.org/TR/css-fonts-5/#font-size-adjust-aspect-value |
| static std::optional<float> FontAspectValue(const SimpleFontData*, |
| FontSizeAdjust::Metric, |
| float computed_size); |
| |
| // Given font data, this function returns a font size adjusted by |
| // font-size-adjust, scaling the font size to achieve the desired aspect |
| // value of font size to metric. |
| static std::optional<float> MetricsMultiplierAdjustedFontSize( |
| const SimpleFontData*, |
| const FontDescription&); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_FONT_SIZE_FUNCTIONS_H_ |