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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QOUTLINEMAPPER_P_H
#define QOUTLINEMAPPER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qtguiglobal_p.h>
#include <QtCore/qrect.h>
#include <QtGui/qtransform.h>
#include <QtGui/qpainterpath.h>
#define QT_FT_BEGIN_HEADER
#define QT_FT_END_HEADER
#include <private/qrasterdefs_p.h>
#include <private/qdatabuffer_p.h>
#include "qpaintengineex_p.h"
QT_BEGIN_NAMESPACE
// These limitations comes from qrasterizer.cpp, qcosmeticstroker.cpp, and qgrayraster.c.
// Any higher and rasterization of shapes will produce incorrect results.
#if Q_PROCESSOR_WORDSIZE == 8
constexpr int QT_RASTER_COORD_LIMIT = ((1<<23) - 1); // F24dot8 in qgrayraster.c
#else
constexpr int QT_RASTER_COORD_LIMIT = ((1<<15) - 1); // F16dot16 in qrasterizer.cpp and qcosmeticstroker.cpp
#endif
//#define QT_DEBUG_CONVERT
Q_GUI_EXPORT bool qt_scaleForTransform(const QTransform &transform, qreal *scale);
/********************************************************************************
* class QOutlineMapper
*
* Used to map between QPainterPath and the QT_FT_Outline structure used by the
* freetype scanconvertor.
*
* The outline mapper uses a path iterator to get points from the path,
* so that it is possible to transform the points as they are converted. The
* callback can be a noop, translate or full-fledged xform. (Tests indicated
* that using a C callback was low cost).
*/
class QOutlineMapper
{
public:
QOutlineMapper() :
m_element_types(0),
m_elements(0),
m_points(0),
m_tags(0),
m_contours(0),
m_in_clip_elements(false)
{
}
/*!
Sets up the matrix to be used for conversion. This also
sets up the qt_path_iterator function that is used as a callback
to get points.
*/
void setMatrix(const QTransform &m)
{
m_transform = m;
qreal scale;
qt_scaleForTransform(m, &scale);
m_curve_threshold = scale == 0 ? qreal(0.25) : (qreal(0.25) / scale);
}
void beginOutline(Qt::FillRule fillRule)
{
#ifdef QT_DEBUG_CONVERT
printf("QOutlineMapper::beginOutline rule=%d\n", fillRule);
#endif
m_valid = true;
m_elements.reset();
m_element_types.reset();
m_points.reset();
m_tags.reset();
m_contours.reset();
m_outline.flags = fillRule == Qt::WindingFill
? QT_FT_OUTLINE_NONE
: QT_FT_OUTLINE_EVEN_ODD_FILL;
m_subpath_start = 0;
}
void endOutline();
void clipElements(const QPointF *points, const QPainterPath::ElementType *types, int count);
void convertElements(const QPointF *points, const QPainterPath::ElementType *types, int count);
inline void moveTo(const QPointF &pt) {
#ifdef QT_DEBUG_CONVERT
printf("QOutlineMapper::moveTo() (%f, %f)\n", pt.x(), pt.y());
#endif
closeSubpath();
m_subpath_start = m_elements.size();
m_elements << pt;
m_element_types << QPainterPath::MoveToElement;
}
inline void lineTo(const QPointF &pt) {
#ifdef QT_DEBUG_CONVERT
printf("QOutlineMapper::lineTo() (%f, %f)\n", pt.x(), pt.y());
#endif
m_elements.add(pt);
m_element_types << QPainterPath::LineToElement;
}
void curveTo(const QPointF &cp1, const QPointF &cp2, const QPointF &ep);
inline void closeSubpath() {
int element_count = m_elements.size();
if (element_count > 0) {
if (m_elements.at(element_count-1) != m_elements.at(m_subpath_start)) {
#ifdef QT_DEBUG_CONVERT
printf(" - implicitly closing\n");
#endif
// Put the object on the stack to avoid the odd case where
// lineTo reallocs the databuffer and the QPointF & will
// be invalidated.
QPointF pt = m_elements.at(m_subpath_start);
// only do lineTo if we have element_type array...
if (m_element_types.size())
lineTo(pt);
else
m_elements << pt;
}
}
}
QT_FT_Outline *outline() {
if (m_valid)
return &m_outline;
return nullptr;
}
QT_FT_Outline *convertPath(const QPainterPath &path);
QT_FT_Outline *convertPath(const QVectorPath &path);
inline QPainterPath::ElementType *elementTypes() const { return m_element_types.size() == 0 ? nullptr : m_element_types.data(); }
public:
QDataBuffer<QPainterPath::ElementType> m_element_types;
QDataBuffer<QPointF> m_elements;
QDataBuffer<QT_FT_Vector> m_points;
QDataBuffer<char> m_tags;
QDataBuffer<int> m_contours;
QRect m_clip_rect;
QRectF controlPointRect; // only valid after endOutline()
QT_FT_Outline m_outline;
int m_subpath_start;
QTransform m_transform;
qreal m_curve_threshold;
bool m_valid;
bool m_in_clip_elements;
};
QT_END_NAMESPACE
#endif // QOUTLINEMAPPER_P_H
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