/* * Copyright (c) 2012, Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_WRITING_MODE_H_ #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_WRITING_MODE_H_ #include <cstdint> #include <iosfwd> #include "third_party/blink/renderer/platform/platform_export.h" namespace blink { // These values are named to match the CSS keywords they correspond to: namely // horizontal-tb, vertical-rl and vertical-lr. // Since these names aren't very self-explanatory, where possible use the // inline utility functions below. enum class WritingMode : uint8_t { … }; // Lines have horizontal orientation; modes horizontal-tb. inline bool IsHorizontalWritingMode(WritingMode writing_mode) { … } // Bottom of the line occurs earlier in the block; modes vertical-lr. inline bool IsFlippedLinesWritingMode(WritingMode writing_mode) { … } // In flipped-lines writing mode, 'line-over' and 'block-start' don't match. // When dealing with the logical coordinate system in the [line-relative // directions], 'vertical-lr' has 'line-over' on right, which is equivalent to // the 'vertical-rl' in the flow-relative directions. // https://drafts.csswg.org/css-writing-modes-3/#line-directions inline WritingMode ToLineWritingMode(WritingMode writing_mode) { … } // Block progression increases in the opposite direction to normal; modes // vertical-rl and sideways-rl. inline bool IsFlippedBlocksWritingMode(WritingMode writing_mode) { … } // Whether the child and the containing block are parallel to each other. // Example: vertical-rl and vertical-lr inline bool IsParallelWritingMode(WritingMode a, WritingMode b) { … } // Returns true if the specified writing-mode is a horizontal typographic // mode; modes horizontal-tb, sideways-lr, and sideways-rl. // https://drafts.csswg.org/css-writing-modes/#horizontal-typographic-mode inline bool IsHorizontalTypographicMode(WritingMode writing_mode) { … } PLATFORM_EXPORT std::ostream& operator<<(std::ostream&, WritingMode); } // namespace blink #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_WRITING_MODE_H_
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