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-rw-r--r--WebCore/platform/graphics/cairo/PathCairo.cpp285
1 files changed, 285 insertions, 0 deletions
diff --git a/WebCore/platform/graphics/cairo/PathCairo.cpp b/WebCore/platform/graphics/cairo/PathCairo.cpp
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+++ b/WebCore/platform/graphics/cairo/PathCairo.cpp
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+/*
+ 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
+{
+ cairo_t* cr = platformPath()->m_cr;
+#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1,5,10)
+ return !cairo_has_current_point(cr);
+#else
+ cairo_path_t* p = cairo_copy_path(cr);
+ bool hasData = p->num_data;
+ cairo_path_destroy(p);
+ return !hasData;
+#endif
+}
+
+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;
+#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 6, 0)
+ cairo_path_extents(cr, &x0, &y0, &x1, &y1);
+#else
+ cairo_stroke_extents(cr, &x0, &y0, &x1, &y1);
+#endif
+ 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_matrix_invert(&c_matrix);
+ 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
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