WebCore/platform/graphics/cairo/PathCairo.cpp - platform/external/webkit - Gitiles

 /*
     Copyright (C) 2007 Krzysztof Kowalczyk <kkowalczyk@gmail.com>
     Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <wildfox@kde.org>
                   2004, 2005, 2006 Rob Buis <buis@kde.org>
                   2005, 2007 Apple Inc. All Rights reserved.
                   2007 Alp Toker <alp@atoker.com>

     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
     aint 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 "config.h"
 #include "Path.h"

 #include "AffineTransform.h"
 #include "CairoPath.h"
 #include "FloatRect.h"
 #include "NotImplemented.h"
 #include "PlatformString.h"

 #include <cairo.h>
 #include <math.h>
 #include <wtf/MathExtras.h>

 namespace WebCore {

 Path::Path()
     : m_path(new CairoPath())
 {
 }

 Path::~Path()
 {
     delete m_path;
 }

 Path::Path(const Path& other)
     : m_path(new CairoPath())
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_path_t* p = cairo_copy_path(other.platformPath()->m_cr);
     cairo_append_path(cr, p);
     cairo_path_destroy(p);
 }

 Path& Path::operator=(const Path& other)
 {
     if (&other == this)
         return *this;

     clear();
     cairo_t* cr = platformPath()->m_cr;
     cairo_path_t* p = cairo_copy_path(other.platformPath()->m_cr);
     cairo_append_path(cr, p);
     cairo_path_destroy(p);
     return *this;
 }

 void Path::clear()
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_new_path(cr);
 }

 bool Path::isEmpty() const
 {
     // FIXME: if/when the patch to get current pt return status is applied
     // double dx,dy;
     // return cairo_get_current_point(cr, &dx, &dy);

     cairo_t* cr = platformPath()->m_cr;
     cairo_path_t* p = cairo_copy_path(cr);
     bool hasData = p->num_data;
     cairo_path_destroy(p);
     return !hasData;
 }

 void Path::translate(const FloatSize& p)
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_translate(cr, p.width(), p.height());
 }

 void Path::moveTo(const FloatPoint& p)
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_move_to(cr, p.x(), p.y());
 }

 void Path::addLineTo(const FloatPoint& p)
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_line_to(cr, p.x(), p.y());
 }

 void Path::addRect(const FloatRect& rect)
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
 }

 /*
  * inspired by libsvg-cairo
  */
 void Path::addQuadCurveTo(const FloatPoint& controlPoint, const FloatPoint& point)
 {
     cairo_t* cr = platformPath()->m_cr;
     double x, y;
     double x1 = controlPoint.x();
     double y1 = controlPoint.y();
     double x2 = point.x();
     double y2 = point.y();
     cairo_get_current_point(cr, &x, &y);
     cairo_curve_to(cr,
                    x  + 2.0 / 3.0 * (x1 - x),  y  + 2.0 / 3.0 * (y1 - y),
                    x2 + 2.0 / 3.0 * (x1 - x2), y2 + 2.0 / 3.0 * (y1 - y2),
                    x2, y2);
 }

 void Path::addBezierCurveTo(const FloatPoint& controlPoint1, const FloatPoint& controlPoint2, const FloatPoint& controlPoint3)
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_curve_to(cr, controlPoint1.x(), controlPoint1.y(),
                    controlPoint2.x(), controlPoint2.y(),
                    controlPoint3.x(), controlPoint3.y());
 }

 void Path::addArc(const FloatPoint& p, float r, float sa, float ea, bool anticlockwise)
 {
     // http://bugs.webkit.org/show_bug.cgi?id=16449
     // cairo_arc() functions hang or crash when passed inf as radius or start/end angle
     if (!isfinite(r) || !isfinite(sa) || !isfinite(ea))
         return;

     cairo_t* cr = platformPath()->m_cr;
     if (anticlockwise)
         cairo_arc_negative(cr, p.x(), p.y(), r, sa, ea);
     else
         cairo_arc(cr, p.x(), p.y(), r, sa, ea);
 }

 void Path::addArcTo(const FloatPoint& p1, const FloatPoint& p2, float radius)
 {
     // FIXME: cairo_arc_to not yet in cairo see cairo.h
     // cairo_arc_to(m_cr, p1.x(), p1.y(), p2.x(), p2.y());
     notImplemented();
 }

 void Path::addEllipse(const FloatRect& rect)
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_save(cr);
     float yRadius = .5 * rect.height();
     float xRadius = .5 * rect.width();
     cairo_translate(cr, rect.x() + xRadius, rect.y() + yRadius);
     cairo_scale(cr, xRadius, yRadius);
     cairo_arc(cr, 0., 0., 1., 0., 2 * piDouble);
     cairo_restore(cr);
 }

 void Path::closeSubpath()
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_close_path(cr);
 }

 FloatRect Path::boundingRect() const
 {
     cairo_t* cr = platformPath()->m_cr;
     double x0, x1, y0, y1;
     cairo_fill_extents(cr, &x0, &y0, &x1, &y1);
     return FloatRect(x0, y0, x1 - x0, y1 - y0);
 }

 bool Path::contains(const FloatPoint& point, WindRule rule) const
 {
     if (!boundingRect().contains(point))
         return false;

     cairo_t* cr = platformPath()->m_cr;
     cairo_fill_rule_t cur = cairo_get_fill_rule(cr);
     cairo_set_fill_rule(cr, rule == RULE_EVENODD ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
     bool contains = cairo_in_fill(cr, point.x(), point.y());
     cairo_set_fill_rule(cr, cur);
     return contains;
 }

 void Path::apply(void* info, PathApplierFunction function) const
 {
     cairo_t* cr = platformPath()->m_cr;
     cairo_path_t* path = cairo_copy_path(cr);
     cairo_path_data_t* data;
     PathElement pelement;
     FloatPoint points[3];
     pelement.points = points;

     for (int i = 0; i < path->num_data; i += path->data[i].header.length) {
         data = &path->data[i];
         switch (data->header.type) {
         case CAIRO_PATH_MOVE_TO:
             pelement.type = PathElementMoveToPoint;
             pelement.points[0] = FloatPoint(data[1].point.x,data[1].point.y);
             function(info, &pelement);
             break;
         case CAIRO_PATH_LINE_TO:
             pelement.type = PathElementAddLineToPoint;
             pelement.points[0] = FloatPoint(data[1].point.x,data[1].point.y);
             function(info, &pelement);
             break;
         case CAIRO_PATH_CURVE_TO:
             pelement.type = PathElementAddCurveToPoint;
             pelement.points[0] = FloatPoint(data[1].point.x,data[1].point.y);
             pelement.points[1] = FloatPoint(data[2].point.x,data[2].point.y);
             pelement.points[2] = FloatPoint(data[3].point.x,data[3].point.y);
             function(info, &pelement);
             break;
         case CAIRO_PATH_CLOSE_PATH:
             pelement.type = PathElementCloseSubpath;
             function(info, &pelement);
             break;
         }
     }
     cairo_path_destroy(path);
 }

 void Path::transform(const AffineTransform& trans)
 {
     cairo_t* m_cr = platformPath()->m_cr;
     cairo_matrix_t c_matrix = cairo_matrix_t(trans);
     cairo_transform(m_cr, &c_matrix);
 }

 String Path::debugString() const
 {
     String string = "";
     cairo_path_t* path = cairo_copy_path(platformPath()->m_cr);
     cairo_path_data_t* data;

     if (!path->num_data )
         string = "EMPTY";

     for (int i = 0; i < path->num_data; i += path->data[i].header.length) {
         data = &path->data[i];
         switch (data->header.type) {
         case CAIRO_PATH_MOVE_TO:
             string += String::format("M %.2f,%.2f",
                                       data[1].point.x, data[1].point.y);
             break;
         case CAIRO_PATH_LINE_TO:
             string += String::format("L %.2f,%.2f",
                                       data[1].point.x, data[1].point.y);
             break;
         case CAIRO_PATH_CURVE_TO:
             string += String::format("C %.2f,%.2f,%.2f,%.2f,%.2f,%.2f",
                                       data[1].point.x, data[1].point.y,
                                       data[2].point.x, data[2].point.y,
                                       data[3].point.x, data[3].point.y);
             break;
         case CAIRO_PATH_CLOSE_PATH:
             string += "X";
             break;
         }
     }
     cairo_path_destroy(path);
     return string;
 }

 } // namespace WebCore
	/*
	Copyright (C) 2007 Krzysztof Kowalczyk <kkowalczyk@gmail.com>
	Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <wildfox@kde.org>
	2004, 2005, 2006 Rob Buis <buis@kde.org>
	2005, 2007 Apple Inc. All Rights reserved.
	2007 Alp Toker <alp@atoker.com>

	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
	aint 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 "config.h"
	#include "Path.h"

	#include "AffineTransform.h"
	#include "CairoPath.h"
	#include "FloatRect.h"
	#include "NotImplemented.h"
	#include "PlatformString.h"

	#include <cairo.h>
	#include <math.h>
	#include <wtf/MathExtras.h>

	namespace WebCore {

	Path::Path()
	: m_path(new CairoPath())
	{
	}

	Path::~Path()
	{
	delete m_path;
	}

	Path::Path(const Path& other)
	: m_path(new CairoPath())
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_path_t* p = cairo_copy_path(other.platformPath()->m_cr);
	cairo_append_path(cr, p);
	cairo_path_destroy(p);
	}

	Path& Path::operator=(const Path& other)
	{
	if (&other == this)
	return *this;

	clear();
	cairo_t* cr = platformPath()->m_cr;
	cairo_path_t* p = cairo_copy_path(other.platformPath()->m_cr);
	cairo_append_path(cr, p);
	cairo_path_destroy(p);
	return *this;
	}

	void Path::clear()
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_new_path(cr);
	}

	bool Path::isEmpty() const
	{
	// FIXME: if/when the patch to get current pt return status is applied
	// double dx,dy;
	// return cairo_get_current_point(cr, &dx, &dy);

	cairo_t* cr = platformPath()->m_cr;
	cairo_path_t* p = cairo_copy_path(cr);
	bool hasData = p->num_data;
	cairo_path_destroy(p);
	return !hasData;
	}

	void Path::translate(const FloatSize& p)
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_translate(cr, p.width(), p.height());
	}

	void Path::moveTo(const FloatPoint& p)
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_move_to(cr, p.x(), p.y());
	}

	void Path::addLineTo(const FloatPoint& p)
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_line_to(cr, p.x(), p.y());
	}

	void Path::addRect(const FloatRect& rect)
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
	}

	/*
	* inspired by libsvg-cairo
	*/
	void Path::addQuadCurveTo(const FloatPoint& controlPoint, const FloatPoint& point)
	{
	cairo_t* cr = platformPath()->m_cr;
	double x, y;
	double x1 = controlPoint.x();
	double y1 = controlPoint.y();
	double x2 = point.x();
	double y2 = point.y();
	cairo_get_current_point(cr, &x, &y);
	cairo_curve_to(cr,
	x + 2.0 / 3.0 * (x1 - x), y + 2.0 / 3.0 * (y1 - y),
	x2 + 2.0 / 3.0 * (x1 - x2), y2 + 2.0 / 3.0 * (y1 - y2),
	x2, y2);
	}

	void Path::addBezierCurveTo(const FloatPoint& controlPoint1, const FloatPoint& controlPoint2, const FloatPoint& controlPoint3)
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_curve_to(cr, controlPoint1.x(), controlPoint1.y(),
	controlPoint2.x(), controlPoint2.y(),
	controlPoint3.x(), controlPoint3.y());
	}

	void Path::addArc(const FloatPoint& p, float r, float sa, float ea, bool anticlockwise)
	{
	// http://bugs.webkit.org/show_bug.cgi?id=16449
	// cairo_arc() functions hang or crash when passed inf as radius or start/end angle
	if (!isfinite(r) \|\| !isfinite(sa) \|\| !isfinite(ea))
	return;

	cairo_t* cr = platformPath()->m_cr;
	if (anticlockwise)
	cairo_arc_negative(cr, p.x(), p.y(), r, sa, ea);
	else
	cairo_arc(cr, p.x(), p.y(), r, sa, ea);
	}

	void Path::addArcTo(const FloatPoint& p1, const FloatPoint& p2, float radius)
	{
	// FIXME: cairo_arc_to not yet in cairo see cairo.h
	// cairo_arc_to(m_cr, p1.x(), p1.y(), p2.x(), p2.y());
	notImplemented();
	}

	void Path::addEllipse(const FloatRect& rect)
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_save(cr);
	float yRadius = .5 * rect.height();
	float xRadius = .5 * rect.width();
	cairo_translate(cr, rect.x() + xRadius, rect.y() + yRadius);
	cairo_scale(cr, xRadius, yRadius);
	cairo_arc(cr, 0., 0., 1., 0., 2 * piDouble);
	cairo_restore(cr);
	}

	void Path::closeSubpath()
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_close_path(cr);
	}

	FloatRect Path::boundingRect() const
	{
	cairo_t* cr = platformPath()->m_cr;
	double x0, x1, y0, y1;
	cairo_fill_extents(cr, &x0, &y0, &x1, &y1);
	return FloatRect(x0, y0, x1 - x0, y1 - y0);
	}

	bool Path::contains(const FloatPoint& point, WindRule rule) const
	{
	if (!boundingRect().contains(point))
	return false;

	cairo_t* cr = platformPath()->m_cr;
	cairo_fill_rule_t cur = cairo_get_fill_rule(cr);
	cairo_set_fill_rule(cr, rule == RULE_EVENODD ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
	bool contains = cairo_in_fill(cr, point.x(), point.y());
	cairo_set_fill_rule(cr, cur);
	return contains;
	}

	void Path::apply(void* info, PathApplierFunction function) const
	{
	cairo_t* cr = platformPath()->m_cr;
	cairo_path_t* path = cairo_copy_path(cr);
	cairo_path_data_t* data;
	PathElement pelement;
	FloatPoint points[3];
	pelement.points = points;

	for (int i = 0; i < path->num_data; i += path->data[i].header.length) {
	data = &path->data[i];
	switch (data->header.type) {
	case CAIRO_PATH_MOVE_TO:
	pelement.type = PathElementMoveToPoint;
	pelement.points[0] = FloatPoint(data[1].point.x,data[1].point.y);
	function(info, &pelement);
	break;
	case CAIRO_PATH_LINE_TO:
	pelement.type = PathElementAddLineToPoint;
	pelement.points[0] = FloatPoint(data[1].point.x,data[1].point.y);
	function(info, &pelement);
	break;
	case CAIRO_PATH_CURVE_TO:
	pelement.type = PathElementAddCurveToPoint;
	pelement.points[0] = FloatPoint(data[1].point.x,data[1].point.y);
	pelement.points[1] = FloatPoint(data[2].point.x,data[2].point.y);
	pelement.points[2] = FloatPoint(data[3].point.x,data[3].point.y);
	function(info, &pelement);
	break;
	case CAIRO_PATH_CLOSE_PATH:
	pelement.type = PathElementCloseSubpath;
	function(info, &pelement);
	break;
	}
	}
	cairo_path_destroy(path);
	}

	void Path::transform(const AffineTransform& trans)
	{
	cairo_t* m_cr = platformPath()->m_cr;
	cairo_matrix_t c_matrix = cairo_matrix_t(trans);
	cairo_transform(m_cr, &c_matrix);
	}

	String Path::debugString() const
	{
	String string = "";
	cairo_path_t* path = cairo_copy_path(platformPath()->m_cr);
	cairo_path_data_t* data;

	if (!path->num_data )
	string = "EMPTY";

	for (int i = 0; i < path->num_data; i += path->data[i].header.length) {
	data = &path->data[i];
	switch (data->header.type) {
	case CAIRO_PATH_MOVE_TO:
	string += String::format("M %.2f,%.2f",
	data[1].point.x, data[1].point.y);
	break;
	case CAIRO_PATH_LINE_TO:
	string += String::format("L %.2f,%.2f",
	data[1].point.x, data[1].point.y);
	break;
	case CAIRO_PATH_CURVE_TO:
	string += String::format("C %.2f,%.2f,%.2f,%.2f,%.2f,%.2f",
	data[1].point.x, data[1].point.y,
	data[2].point.x, data[2].point.y,
	data[3].point.x, data[3].point.y);
	break;
	case CAIRO_PATH_CLOSE_PATH:
	string += "X";
	break;
	}
	}
	cairo_path_destroy(path);
	return string;
	}

	} // namespace WebCore