1 /* 2 * Copyright (c) 2012, Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef WritingMode_h 32 #define WritingMode_h 33 34 namespace WebCore { 35 36 enum WritingMode { 37 TopToBottomWritingMode, RightToLeftWritingMode, LeftToRightWritingMode, BottomToTopWritingMode 38 }; 39 40 // Lines have horizontal orientation; modes horizontal-tb or horizontal-bt. 41 inline bool isHorizontalWritingMode(WritingMode writingMode) 42 { 43 return writingMode == TopToBottomWritingMode || writingMode == BottomToTopWritingMode; 44 } 45 46 // Bottom of the line occurs earlier in the block; modes vertical-lr or horizontal-bt. 47 inline bool isFlippedLinesWritingMode(WritingMode writingMode) 48 { 49 return writingMode == LeftToRightWritingMode || writingMode == BottomToTopWritingMode; 50 } 51 52 // Block progression increases in the opposite direction to normal; modes vertical-rl or horizontal-bt. 53 inline bool isFlippedBlocksWritingMode(WritingMode writingMode) 54 { 55 return writingMode == RightToLeftWritingMode || writingMode == BottomToTopWritingMode; 56 } 57 58 } // namespace WebCore 59 60 #endif // WritingMode_h 61
