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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.
*/
#include "core/svg/SVGPathByteStreamBuilder.h"
#include "core/svg/SVGPathByteStream.h"
#include "core/svg/SVGPathData.h"
#include "platform/geometry/FloatPoint.h"
namespace blink {
// Helper class that coalesces writes to a SVGPathByteStream to a local buffer.
class CoalescingBuffer {
public:
CoalescingBuffer(SVGPathByteStream& byteStream)
: m_currentOffset(0), m_byteStream(byteStream) {}
~CoalescingBuffer() { m_byteStream.append(m_bytes, m_currentOffset); }
template <typename DataType>
void writeType(DataType value) {
ByteType<DataType> data;
data.value = value;
size_t typeSize = sizeof(ByteType<DataType>);
ASSERT(m_currentOffset + typeSize <= sizeof(m_bytes));
memcpy(m_bytes + m_currentOffset, data.bytes, typeSize);
m_currentOffset += typeSize;
}
void writeFlag(bool value) { writeType<bool>(value); }
void writeFloat(float value) { writeType<float>(value); }
void writeFloatPoint(const FloatPoint& point) {
writeType<float>(point.x());
writeType<float>(point.y());
}
void writeSegmentType(unsigned short value) {
writeType<unsigned short>(value);
}
private:
// Adjust size to fit the largest command (in serialized/byte-stream format).
// Currently a cubic segment.
size_t m_currentOffset;
unsigned char m_bytes[sizeof(unsigned short) + sizeof(FloatPoint) * 3];
SVGPathByteStream& m_byteStream;
};
SVGPathByteStreamBuilder::SVGPathByteStreamBuilder(
SVGPathByteStream& byteStream)
: m_byteStream(byteStream) {}
void SVGPathByteStreamBuilder::emitSegment(const PathSegmentData& segment) {
CoalescingBuffer buffer(m_byteStream);
buffer.writeSegmentType(segment.command);
switch (segment.command) {
case PathSegMoveToRel:
case PathSegMoveToAbs:
case PathSegLineToRel:
case PathSegLineToAbs:
case PathSegCurveToQuadraticSmoothRel:
case PathSegCurveToQuadraticSmoothAbs:
buffer.writeFloatPoint(segment.targetPoint);
break;
case PathSegLineToHorizontalRel:
case PathSegLineToHorizontalAbs:
buffer.writeFloat(segment.targetPoint.x());
break;
case PathSegLineToVerticalRel:
case PathSegLineToVerticalAbs:
buffer.writeFloat(segment.targetPoint.y());
break;
case PathSegClosePath:
break;
case PathSegCurveToCubicRel:
case PathSegCurveToCubicAbs:
buffer.writeFloatPoint(segment.point1);
buffer.writeFloatPoint(segment.point2);
buffer.writeFloatPoint(segment.targetPoint);
break;
case PathSegCurveToCubicSmoothRel:
case PathSegCurveToCubicSmoothAbs:
buffer.writeFloatPoint(segment.point2);
buffer.writeFloatPoint(segment.targetPoint);
break;
case PathSegCurveToQuadraticRel:
case PathSegCurveToQuadraticAbs:
buffer.writeFloatPoint(segment.point1);
buffer.writeFloatPoint(segment.targetPoint);
break;
case PathSegArcRel:
case PathSegArcAbs:
buffer.writeFloatPoint(segment.point1);
buffer.writeFloat(segment.point2.x());
buffer.writeFlag(segment.arcLarge);
buffer.writeFlag(segment.arcSweep);
buffer.writeFloatPoint(segment.targetPoint);
break;
default:
ASSERT_NOT_REACHED();
}
}
} // namespace blink
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