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/*
* 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 THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_TEXT_LAYOUT_ENGINE_BASELINE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_SVG_SVG_TEXT_LAYOUT_ENGINE_BASELINE_H_
#include "third_party/blink/renderer/core/layout/api/line_layout_item.h"
#include "third_party/blink/renderer/core/style/svg_computed_style_defs.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/unicode.h"
namespace blink {
class Font;
class ComputedStyle;
// Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' /
// 'dominant-baseline' and 'baseline-shift'.
class SVGTextLayoutEngineBaseline {
STACK_ALLOCATED();
public:
SVGTextLayoutEngineBaseline(const Font&, float effective_zoom);
SVGTextLayoutEngineBaseline(const SVGTextLayoutEngineBaseline&) = delete;
SVGTextLayoutEngineBaseline& operator=(const SVGTextLayoutEngineBaseline&) =
delete;
float CalculateBaselineShift(const ComputedStyle&) const;
float CalculateAlignmentBaselineShift(bool is_vertical_text,
LineLayoutItem) const;
private:
EAlignmentBaseline DominantBaselineToAlignmentBaseline(bool is_vertical_text,
LineLayoutItem) const;
const Font& font_;
// Everything we read from the m_font's font descriptor during layout is
// scaled by the effective zoom, as fonts always are in computed style. Since
// layout inside SVG takes place in unzoomed coordinates we have to compensate
// for zoom when reading values from the font descriptor.
float effective_zoom_;
};
} // namespace blink
#endif
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