gecko-dev/gfx/2d/PathSkia.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "PathSkia.h"
#include <math.h>
#include "DrawTargetSkia.h"
#include "Logging.h"
#include "HelpersSkia.h"
#include "PathHelpers.h"

namespace mozilla {
namespace gfx {

PathBuilderSkia::PathBuilderSkia(const Matrix &aTransform, const SkPath &aPath,
                                 FillRule aFillRule)
    : mPath(aPath) {
  SkMatrix matrix;
  GfxMatrixToSkiaMatrix(aTransform, matrix);
  mPath.transform(matrix);
  SetFillRule(aFillRule);
}

PathBuilderSkia::PathBuilderSkia(FillRule aFillRule) { SetFillRule(aFillRule); }

void PathBuilderSkia::SetFillRule(FillRule aFillRule) {
  mFillRule = aFillRule;
  if (mFillRule == FillRule::FILL_WINDING) {
    mPath.setFillType(SkPath::kWinding_FillType);
  } else {
    mPath.setFillType(SkPath::kEvenOdd_FillType);
  }
}

void PathBuilderSkia::MoveTo(const Point &aPoint) {
  mPath.moveTo(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y));
}

void PathBuilderSkia::LineTo(const Point &aPoint) {
  if (!mPath.countPoints()) {
    MoveTo(aPoint);
  } else {
    mPath.lineTo(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y));
  }
}

void PathBuilderSkia::BezierTo(const Point &aCP1, const Point &aCP2,
                               const Point &aCP3) {
  if (!mPath.countPoints()) {
    MoveTo(aCP1);
  }
  mPath.cubicTo(SkFloatToScalar(aCP1.x), SkFloatToScalar(aCP1.y),
                SkFloatToScalar(aCP2.x), SkFloatToScalar(aCP2.y),
                SkFloatToScalar(aCP3.x), SkFloatToScalar(aCP3.y));
}

void PathBuilderSkia::QuadraticBezierTo(const Point &aCP1, const Point &aCP2) {
  if (!mPath.countPoints()) {
    MoveTo(aCP1);
  }
  mPath.quadTo(SkFloatToScalar(aCP1.x), SkFloatToScalar(aCP1.y),
               SkFloatToScalar(aCP2.x), SkFloatToScalar(aCP2.y));
}

void PathBuilderSkia::Close() { mPath.close(); }

void PathBuilderSkia::Arc(const Point &aOrigin, float aRadius,
                          float aStartAngle, float aEndAngle,
                          bool aAntiClockwise) {
  ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle,
              aAntiClockwise);
}

Point PathBuilderSkia::CurrentPoint() const {
  int pointCount = mPath.countPoints();
  if (!pointCount) {
    return Point(0, 0);
  }
  SkPoint point = mPath.getPoint(pointCount - 1);
  return Point(SkScalarToFloat(point.fX), SkScalarToFloat(point.fY));
}

already_AddRefed<Path> PathBuilderSkia::Finish() {
  return MakeAndAddRef<PathSkia>(mPath, mFillRule);
}

void PathBuilderSkia::AppendPath(const SkPath &aPath) { mPath.addPath(aPath); }

already_AddRefed<PathBuilder> PathSkia::CopyToBuilder(
    FillRule aFillRule) const {
  return TransformedCopyToBuilder(Matrix(), aFillRule);
}

already_AddRefed<PathBuilder> PathSkia::TransformedCopyToBuilder(
    const Matrix &aTransform, FillRule aFillRule) const {
  return MakeAndAddRef<PathBuilderSkia>(aTransform, mPath, aFillRule);
}

static bool SkPathContainsPoint(const SkPath &aPath, const Point &aPoint,
                                const Matrix &aTransform) {
  Matrix inverse = aTransform;
  if (!inverse.Invert()) {
    return false;
  }

  SkPoint point = PointToSkPoint(inverse.TransformPoint(aPoint));
  return aPath.contains(point.fX, point.fY);
}

bool PathSkia::ContainsPoint(const Point &aPoint,
                             const Matrix &aTransform) const {
  if (!mPath.isFinite()) {
    return false;
  }

  return SkPathContainsPoint(mPath, aPoint, aTransform);
}

bool PathSkia::StrokeContainsPoint(const StrokeOptions &aStrokeOptions,
                                   const Point &aPoint,
                                   const Matrix &aTransform) const {
  if (!mPath.isFinite()) {
    return false;
  }

  SkPaint paint;
  if (!StrokeOptionsToPaint(paint, aStrokeOptions)) {
    return false;
  }

  SkPath strokePath;
  paint.getFillPath(mPath, &strokePath);

  return SkPathContainsPoint(strokePath, aPoint, aTransform);
}

Rect PathSkia::GetBounds(const Matrix &aTransform) const {
  if (!mPath.isFinite()) {
    return Rect();
  }

  Rect bounds = SkRectToRect(mPath.computeTightBounds());
  return aTransform.TransformBounds(bounds);
}

Rect PathSkia::GetStrokedBounds(const StrokeOptions &aStrokeOptions,
                                const Matrix &aTransform) const {
  if (!mPath.isFinite()) {
    return Rect();
  }

  SkPaint paint;
  if (!StrokeOptionsToPaint(paint, aStrokeOptions)) {
    return Rect();
  }

  SkPath result;
  paint.getFillPath(mPath, &result);

  Rect bounds = SkRectToRect(result.computeTightBounds());
  return aTransform.TransformBounds(bounds);
}

void PathSkia::StreamToSink(PathSink *aSink) const {
  SkPath::RawIter iter(mPath);

  SkPoint points[4];
  SkPath::Verb currentVerb;
  while ((currentVerb = iter.next(points)) != SkPath::kDone_Verb) {
    switch (currentVerb) {
      case SkPath::kMove_Verb:
        aSink->MoveTo(SkPointToPoint(points[0]));
        break;
      case SkPath::kLine_Verb:
        aSink->LineTo(SkPointToPoint(points[1]));
        break;
      case SkPath::kCubic_Verb:
        aSink->BezierTo(SkPointToPoint(points[1]), SkPointToPoint(points[2]),
                        SkPointToPoint(points[3]));
        break;
      case SkPath::kQuad_Verb:
        aSink->QuadraticBezierTo(SkPointToPoint(points[1]),
                                 SkPointToPoint(points[2]));
        break;
      case SkPath::kClose_Verb:
        aSink->Close();
        break;
      default:
        MOZ_ASSERT(false);
        // Unexpected verb found in path!
    }
  }
}

}  // namespace gfx
}  // namespace mozilla