| /* |
| * Copyright (C) Research In Motion Limited 2010-2012. 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_TEXT_LAYOUT_ENGINE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_TEXT_LAYOUT_ENGINE_H_ |
| |
| #include <memory> |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/core/layout/api/line_layout_svg_inline_text.h" |
| #include "third_party/blink/renderer/core/layout/svg/layout_svg_inline_text.h" |
| #include "third_party/blink/renderer/core/layout/svg/svg_text_fragment.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| |
| namespace blink { |
| |
| class ComputedStyle; |
| class InlineFlowBox; |
| class PathPositionMapper; |
| class SVGInlineFlowBox; |
| class SVGInlineTextBox; |
| class SVGTextMetrics; |
| |
| // 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 LayoutSVGInlineText layoutObjects to compute the final positions |
| // for each character which are stored in the SVGInlineTextBox objects. |
| |
| class SVGTextLayoutEngine { |
| STACK_ALLOCATED(); |
| |
| public: |
| SVGTextLayoutEngine(const Vector<LayoutSVGInlineText*>&); |
| ~SVGTextLayoutEngine(); |
| |
| void LayoutCharactersInTextBoxes(InlineFlowBox* start); |
| void FinishLayout(); |
| |
| private: |
| bool SetCurrentTextPosition(const SVGCharacterData&); |
| void AdvanceCurrentTextPosition(float glyph_advance); |
| bool ApplyRelativePositionAdjustmentsIfNeeded(const SVGCharacterData&); |
| |
| void ComputeCurrentFragmentMetrics(SVGInlineTextBox*); |
| void RecordTextFragment(SVGInlineTextBox*); |
| |
| void BeginTextPathLayout(SVGInlineFlowBox*); |
| void EndTextPathLayout(); |
| |
| void LayoutInlineTextBox(SVGInlineTextBox*); |
| void LayoutTextOnLineOrPath(SVGInlineTextBox*, |
| LineLayoutSVGInlineText, |
| const ComputedStyle&); |
| |
| const LayoutSVGInlineText* NextLogicalTextNode(); |
| const LayoutSVGInlineText* CurrentLogicalCharacterMetrics(SVGTextMetrics&); |
| void AdvanceToNextLogicalCharacter(const SVGTextMetrics&); |
| |
| // Logical iteration state. |
| const Vector<LayoutSVGInlineText*>& descendant_text_nodes_; |
| unsigned current_logical_text_node_index_; |
| unsigned logical_character_offset_; |
| unsigned logical_metrics_list_offset_; |
| |
| Vector<SVGInlineTextBox*> line_layout_boxes_; |
| |
| SVGTextFragment current_text_fragment_; |
| SVGInlineTextMetricsIterator visual_metrics_iterator_; |
| FloatPoint text_position_; |
| bool is_vertical_text_; |
| bool in_path_layout_; |
| bool text_length_spacing_in_effect_; |
| |
| // Text on path layout |
| std::unique_ptr<PathPositionMapper> text_path_; |
| float text_path_start_offset_; |
| float text_path_current_offset_; |
| float text_path_displacement_; |
| float text_path_spacing_; |
| float text_path_scaling_; |
| DISALLOW_COPY_AND_ASSIGN(SVGTextLayoutEngine); |
| }; |
| |
| } // namespace blink |
| |
| #endif |