/*
* 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 SVGTextFragment_h
#define SVGTextFragment_h
#include "platform/transforms/AffineTransform.h"
namespace WebCore {
// A SVGTextFragment describes a text fragment of a RenderSVGInlineText which can be rendered at once.
struct SVGTextFragment {
SVGTextFragment()
: characterOffset(0)
, metricsListOffset(0)
, length(0)
, isTextOnPath(false)
, x(0)
, y(0)
, width(0)
, height(0)
{
}
enum TransformType {
TransformRespectingTextLength,
TransformIgnoringTextLength
};
void buildFragmentTransform(AffineTransform& result, TransformType type = TransformRespectingTextLength) const
{
if (type == TransformIgnoringTextLength) {
result = transform;
transformAroundOrigin(result);
return;
}
if (isTextOnPath)
buildTransformForTextOnPath(result);
else
buildTransformForTextOnLine(result);
}
// The first rendered character starts at RenderSVGInlineText::characters() + characterOffset.
unsigned characterOffset;
unsigned metricsListOffset;
unsigned length : 31;
bool isTextOnPath : 1;
float x;
float y;
float width;
float height;
// Includes rotation/glyph-orientation-(horizontal|vertical) transforms, as well as orientation related shifts
// (see SVGTextLayoutEngine, which builds this transformation).
AffineTransform transform;
// Contains lengthAdjust related transformations, which are not allowd to influence the SVGTextQuery code.
AffineTransform lengthAdjustTransform;
private:
void transformAroundOrigin(AffineTransform& result) const
{
// Returns (translate(x, y) * result) * translate(-x, -y).
result.setE(result.e() + x);
result.setF(result.f() + y);
result.translate(-x, -y);
}
void buildTransformForTextOnPath(AffineTransform& result) const
{
// For text-on-path layout, multiply the transform with the lengthAdjustTransform before orienting the resulting transform.
result = lengthAdjustTransform.isIdentity() ? transform : transform * lengthAdjustTransform;
if (!result.isIdentity())
transformAroundOrigin(result);
}
void buildTransformForTextOnLine(AffineTransform& result) const
{
// For text-on-line layout, orient the transform first, then multiply the lengthAdjustTransform with the oriented transform.
if (transform.isIdentity()) {
result = lengthAdjustTransform;
return;
}
result = transform;
transformAroundOrigin(result);
if (!lengthAdjustTransform.isIdentity())
result = lengthAdjustTransform * result;
}
};
} // namespace WebCore
#endif