gecko/gfx/2d/PathCairo.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2012-05-21 04:12:37 -07:00
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "PathCairo.h"
#include <math.h>
#include "DrawTargetCairo.h"
#include "Logging.h"
#include "PathHelpers.h"
#include "HelpersCairo.h"
namespace mozilla {
namespace gfx {
PathBuilderCairo::PathBuilderCairo(FillRule aFillRule)
: mFillRule(aFillRule)
{
}
void
PathBuilderCairo::MoveTo(const Point &aPoint)
{
cairo_path_data_t data;
data.header.type = CAIRO_PATH_MOVE_TO;
data.header.length = 2;
mPathData.push_back(data);
data.point.x = aPoint.x;
data.point.y = aPoint.y;
mPathData.push_back(data);
mBeginPoint = mCurrentPoint = aPoint;
}
void
PathBuilderCairo::LineTo(const Point &aPoint)
{
cairo_path_data_t data;
data.header.type = CAIRO_PATH_LINE_TO;
data.header.length = 2;
mPathData.push_back(data);
data.point.x = aPoint.x;
data.point.y = aPoint.y;
mPathData.push_back(data);
mCurrentPoint = aPoint;
}
void
PathBuilderCairo::BezierTo(const Point &aCP1,
const Point &aCP2,
const Point &aCP3)
{
cairo_path_data_t data;
data.header.type = CAIRO_PATH_CURVE_TO;
data.header.length = 4;
mPathData.push_back(data);
data.point.x = aCP1.x;
data.point.y = aCP1.y;
mPathData.push_back(data);
data.point.x = aCP2.x;
data.point.y = aCP2.y;
mPathData.push_back(data);
data.point.x = aCP3.x;
data.point.y = aCP3.y;
mPathData.push_back(data);
mCurrentPoint = aCP3;
}
void
PathBuilderCairo::QuadraticBezierTo(const Point &aCP1,
const Point &aCP2)
{
// We need to elevate the degree of this quadratic Bézier to cubic, so we're
// going to add an intermediate control point, and recompute control point 1.
// The first and last control points remain the same.
// This formula can be found on http://fontforge.sourceforge.net/bezier.html
Point CP0 = CurrentPoint();
Point CP1 = (CP0 + aCP1 * 2.0) / 3.0;
Point CP2 = (aCP2 + aCP1 * 2.0) / 3.0;
Point CP3 = aCP2;
cairo_path_data_t data;
data.header.type = CAIRO_PATH_CURVE_TO;
data.header.length = 4;
mPathData.push_back(data);
data.point.x = CP1.x;
data.point.y = CP1.y;
mPathData.push_back(data);
data.point.x = CP2.x;
data.point.y = CP2.y;
mPathData.push_back(data);
data.point.x = CP3.x;
data.point.y = CP3.y;
mPathData.push_back(data);
mCurrentPoint = aCP2;
}
void
PathBuilderCairo::Close()
{
cairo_path_data_t data;
data.header.type = CAIRO_PATH_CLOSE_PATH;
data.header.length = 1;
mPathData.push_back(data);
mCurrentPoint = mBeginPoint;
}
void
PathBuilderCairo::Arc(const Point &aOrigin, float aRadius, float aStartAngle,
float aEndAngle, bool aAntiClockwise)
{
ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle, aAntiClockwise);
}
Point
PathBuilderCairo::CurrentPoint() const
{
return mCurrentPoint;
}
TemporaryRef<Path>
PathBuilderCairo::Finish()
{
return new PathCairo(mFillRule, mPathData, mCurrentPoint);
}
PathCairo::PathCairo(FillRule aFillRule, std::vector<cairo_path_data_t> &aPathData, const Point &aCurrentPoint)
: mFillRule(aFillRule)
, mContainingContext(nullptr)
, mCurrentPoint(aCurrentPoint)
{
mPathData.swap(aPathData);
}
PathCairo::PathCairo(cairo_t *aContext)
: mFillRule(FillRule::FILL_WINDING)
, mContainingContext(nullptr)
{
cairo_path_t *path = cairo_copy_path(aContext);
// XXX - mCurrentPoint is not properly set here, the same is true for the
// D2D Path code, we never require current point when hitting this codepath
// but this should be fixed.
for (int i = 0; i < path->num_data; i++) {
mPathData.push_back(path->data[i]);
}
cairo_path_destroy(path);
}
PathCairo::~PathCairo()
{
if (mContainingContext) {
cairo_destroy(mContainingContext);
}
}
TemporaryRef<PathBuilder>
PathCairo::CopyToBuilder(FillRule aFillRule) const
{
RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(aFillRule);
builder->mPathData = mPathData;
builder->mCurrentPoint = mCurrentPoint;
return builder.forget();
}
TemporaryRef<PathBuilder>
PathCairo::TransformedCopyToBuilder(const Matrix &aTransform, FillRule aFillRule) const
{
RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(aFillRule);
AppendPathToBuilder(builder, &aTransform);
builder->mCurrentPoint = aTransform * mCurrentPoint;
return builder.forget();
}
bool
PathCairo::ContainsPoint(const Point &aPoint, const Matrix &aTransform) const
{
Matrix inverse = aTransform;
inverse.Invert();
Point transformed = inverse * aPoint;
EnsureContainingContext();
return cairo_in_fill(mContainingContext, transformed.x, transformed.y);
}
bool
PathCairo::StrokeContainsPoint(const StrokeOptions &aStrokeOptions,
const Point &aPoint,
const Matrix &aTransform) const
{
Matrix inverse = aTransform;
inverse.Invert();
Point transformed = inverse * aPoint;
EnsureContainingContext();
SetCairoStrokeOptions(mContainingContext, aStrokeOptions);
return cairo_in_stroke(mContainingContext, transformed.x, transformed.y);
}
Rect
PathCairo::GetBounds(const Matrix &aTransform) const
{
EnsureContainingContext();
double x1, y1, x2, y2;
cairo_path_extents(mContainingContext, &x1, &y1, &x2, &y2);
Rect bounds(Float(x1), Float(y1), Float(x2 - x1), Float(y2 - y1));
return aTransform.TransformBounds(bounds);
}
Rect
PathCairo::GetStrokedBounds(const StrokeOptions &aStrokeOptions,
const Matrix &aTransform) const
{
EnsureContainingContext();
double x1, y1, x2, y2;
SetCairoStrokeOptions(mContainingContext, aStrokeOptions);
cairo_stroke_extents(mContainingContext, &x1, &y1, &x2, &y2);
Rect bounds((Float)x1, (Float)y1, (Float)(x2 - x1), (Float)(y2 - y1));
return aTransform.TransformBounds(bounds);
}
void
PathCairo::StreamToSink(PathSink *aSink) const
{
for (size_t i = 0; i < mPathData.size(); i++) {
switch (mPathData[i].header.type) {
case CAIRO_PATH_MOVE_TO:
i++;
aSink->MoveTo(Point(mPathData[i].point.x, mPathData[i].point.y));
break;
case CAIRO_PATH_LINE_TO:
i++;
aSink->LineTo(Point(mPathData[i].point.x, mPathData[i].point.y));
break;
case CAIRO_PATH_CURVE_TO:
aSink->BezierTo(Point(mPathData[i + 1].point.x, mPathData[i + 1].point.y),
Point(mPathData[i + 2].point.x, mPathData[i + 2].point.y),
Point(mPathData[i + 3].point.x, mPathData[i + 3].point.y));
i += 3;
break;
case CAIRO_PATH_CLOSE_PATH:
aSink->Close();
break;
default:
// Corrupt path data!
MOZ_ASSERT(false);
}
}
}
void
PathCairo::EnsureContainingContext() const
{
if (mContainingContext) {
return;
}
mContainingContext = cairo_create(DrawTargetCairo::GetDummySurface());
SetPathOnContext(mContainingContext);
}
void
PathCairo::SetPathOnContext(cairo_t *aContext) const
{
// Needs the correct fill rule set.
cairo_set_fill_rule(aContext, GfxFillRuleToCairoFillRule(mFillRule));
cairo_new_path(aContext);
if (mPathData.size()) {
cairo_path_t path;
path.data = const_cast<cairo_path_data_t*>(&mPathData.front());
path.num_data = mPathData.size();
path.status = CAIRO_STATUS_SUCCESS;
cairo_append_path(aContext, &path);
}
}
void
PathCairo::AppendPathToBuilder(PathBuilderCairo *aBuilder, const Matrix *aTransform) const
{
if (aTransform) {
size_t i = 0;
while (i < mPathData.size()) {
uint32_t pointCount = mPathData[i].header.length - 1;
aBuilder->mPathData.push_back(mPathData[i]);
i++;
for (uint32_t c = 0; c < pointCount; c++) {
cairo_path_data_t data;
Point newPoint = *aTransform * Point(mPathData[i].point.x, mPathData[i].point.y);
data.point.x = newPoint.x;
data.point.y = newPoint.y;
aBuilder->mPathData.push_back(data);
i++;
}
}
} else {
for (size_t i = 0; i < mPathData.size(); i++) {
aBuilder->mPathData.push_back(mPathData[i]);
}
}
}
}
}