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 SVGTextLayoutEngineBaseline_h 21 #define SVGTextLayoutEngineBaseline_h 22 23 #include "core/rendering/style/SVGRenderStyleDefs.h" 24 #include "wtf/Noncopyable.h" 25 26 namespace blink { 27 28 class Font; 29 class RenderObject; 30 class SVGElement; 31 class SVGRenderStyle; 32 class SVGTextMetrics; 33 34 // Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'. 35 class SVGTextLayoutEngineBaseline { 36 WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline); 37 public: 38 SVGTextLayoutEngineBaseline(const Font&); 39 40 float calculateBaselineShift(const SVGRenderStyle&, SVGElement* lengthContext) const; 41 float calculateAlignmentBaselineShift(bool isVerticalText, const RenderObject* textRenderer) const; 42 float calculateGlyphOrientationAngle(bool isVerticalText, const SVGRenderStyle&, const UChar& character) const; 43 float calculateGlyphAdvanceAndOrientation(bool isVerticalText, const SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const; 44 45 private: 46 EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const RenderObject* textRenderer) const; 47 48 const Font& m_font; 49 }; 50 51 } // namespace blink 52 53 #endif 54
