1 /* 2 * Copyright (C) Research In Motion Limited 2010. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #ifndef SVGTextFragment_h 21 #define SVGTextFragment_h 22 23 #include "platform/transforms/AffineTransform.h" 24 25 namespace WebCore { 26 27 // A SVGTextFragment describes a text fragment of a RenderSVGInlineText which can be rendered at once. 28 struct SVGTextFragment { SVGTextFragmentSVGTextFragment29 SVGTextFragment() 30 : characterOffset(0) 31 , metricsListOffset(0) 32 , length(0) 33 , isTextOnPath(false) 34 , x(0) 35 , y(0) 36 , width(0) 37 , height(0) 38 { 39 } 40 41 enum TransformType { 42 TransformRespectingTextLength, 43 TransformIgnoringTextLength 44 }; 45 46 void buildFragmentTransform(AffineTransform& result, TransformType type = TransformRespectingTextLength) const 47 { 48 if (type == TransformIgnoringTextLength) { 49 result = transform; 50 transformAroundOrigin(result); 51 return; 52 } 53 54 if (isTextOnPath) 55 buildTransformForTextOnPath(result); 56 else 57 buildTransformForTextOnLine(result); 58 } 59 60 // The first rendered character starts at RenderSVGInlineText::characters() + characterOffset. 61 unsigned characterOffset; 62 unsigned metricsListOffset; 63 unsigned length : 31; 64 bool isTextOnPath : 1; 65 66 float x; 67 float y; 68 float width; 69 float height; 70 71 // Includes rotation/glyph-orientation-(horizontal|vertical) transforms, as well as orientation related shifts 72 // (see SVGTextLayoutEngine, which builds this transformation). 73 AffineTransform transform; 74 75 // Contains lengthAdjust related transformations, which are not allowd to influence the SVGTextQuery code. 76 AffineTransform lengthAdjustTransform; 77 78 private: transformAroundOriginSVGTextFragment79 void transformAroundOrigin(AffineTransform& result) const 80 { 81 // Returns (translate(x, y) * result) * translate(-x, -y). 82 result.setE(result.e() + x); 83 result.setF(result.f() + y); 84 result.translate(-x, -y); 85 } 86 buildTransformForTextOnPathSVGTextFragment87 void buildTransformForTextOnPath(AffineTransform& result) const 88 { 89 // For text-on-path layout, multiply the transform with the lengthAdjustTransform before orienting the resulting transform. 90 result = lengthAdjustTransform.isIdentity() ? transform : transform * lengthAdjustTransform; 91 if (!result.isIdentity()) 92 transformAroundOrigin(result); 93 } 94 buildTransformForTextOnLineSVGTextFragment95 void buildTransformForTextOnLine(AffineTransform& result) const 96 { 97 // For text-on-line layout, orient the transform first, then multiply the lengthAdjustTransform with the oriented transform. 98 if (transform.isIdentity()) { 99 result = lengthAdjustTransform; 100 return; 101 } 102 103 result = transform; 104 transformAroundOrigin(result); 105 106 if (!lengthAdjustTransform.isIdentity()) 107 result = lengthAdjustTransform * result; 108 } 109 }; 110 111 } // namespace WebCore 112 113 #endif 114