| /* |
| * Copyright (C) Research In Motion Limited 2010. 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 SVGTextLayoutEngine_h |
| #define SVGTextLayoutEngine_h |
| |
| #if ENABLE(SVG) |
| #include "Path.h" |
| #include "SVGTextChunkBuilder.h" |
| #include "SVGTextFragment.h" |
| #include "SVGTextMetrics.h" |
| #include <wtf/Vector.h> |
| |
| namespace WebCore { |
| |
| class RenderObject; |
| class RenderStyle; |
| class RenderSVGInlineText; |
| class SVGElement; |
| class SVGInlineTextBox; |
| class SVGRenderStyle; |
| |
| // SVGTextLayoutEngine performs the second layout phase for SVG text. |
| // |
| // The InlineBox tree was created, containing the text chunk information, necessary to apply |
| // certain SVG specific text layout properties (text-length adjustments and text-anchor). |
| // The second layout phase uses the SVGTextLayoutAttributes stored in the individual |
| // RenderSVGInlineText renderers to compute the final positions for each character |
| // which are stored in the SVGInlineTextBox objects. |
| |
| class SVGTextLayoutEngine { |
| WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngine); |
| public: |
| SVGTextLayoutEngine(Vector<SVGInlineTextBox*>& boxesInLogicalOrder); |
| SVGTextChunkBuilder& chunkLayoutBuilder() { return m_chunkLayoutBuilder; } |
| |
| void beginTextPathLayout(RenderObject*, SVGTextLayoutEngine& lineLayout); |
| void endTextPathLayout(); |
| |
| void layoutInlineTextBox(SVGInlineTextBox*); |
| void finishLayout(); |
| |
| private: |
| struct CharacterRange { |
| CharacterRange(unsigned newStart = 0, unsigned newEnd = 0, SVGInlineTextBox* newBox = 0) |
| : start(newStart) |
| , end(newEnd) |
| , box(newBox) |
| { |
| } |
| |
| unsigned start; |
| unsigned end; |
| SVGInlineTextBox* box; |
| }; |
| |
| typedef Vector<CharacterRange> CharacterRanges; |
| |
| void updateCharacerPositionIfNeeded(float& x, float& y); |
| void updateCurrentTextPosition(float x, float y, float glyphAdvance); |
| void updateRelativePositionAdjustmentsIfNeeded(Vector<float>& dxValues, Vector<float>& dyValues, unsigned valueListPosition); |
| |
| void recordTextFragment(SVGInlineTextBox*, Vector<SVGTextMetrics>& textMetricValues, unsigned characterOffset, unsigned metricsListOffset); |
| bool parentDefinesTextLength(RenderObject*) const; |
| |
| void layoutTextOnLineOrPath(SVGInlineTextBox*, RenderSVGInlineText*, const RenderStyle*); |
| void finalizeTransformMatrices(Vector<SVGInlineTextBox*>&); |
| |
| void nextLogicalBoxAndOffset(unsigned consumeCharacters, unsigned& positionListOffset, SVGInlineTextBox*&); |
| |
| private: |
| CharacterRanges m_ranges; |
| Vector<SVGInlineTextBox*> m_lineLayoutBoxes; |
| Vector<SVGInlineTextBox*> m_pathLayoutBoxes; |
| SVGTextChunkBuilder m_chunkLayoutBuilder; |
| |
| SVGTextFragment m_currentTextFragment; |
| float m_x; |
| float m_y; |
| float m_dx; |
| float m_dy; |
| bool m_isVerticalText; |
| bool m_inPathLayout; |
| |
| // Text on path layout |
| Path m_textPath; |
| float m_textPathLength; |
| float m_textPathStartOffset; |
| float m_textPathCurrentOffset; |
| float m_textPathSpacing; |
| float m_textPathScaling; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(SVG) |
| #endif |