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Diffstat (limited to 'gfx/2d/PathSkia.cpp')
| -rw-r--r-- | gfx/2d/PathSkia.cpp | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/gfx/2d/PathSkia.cpp b/gfx/2d/PathSkia.cpp new file mode 100644 index 0000000000..0824ae7c65 --- /dev/null +++ b/gfx/2d/PathSkia.cpp @@ -0,0 +1,262 @@ +/* -*- 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 "HelpersSkia.h" +#include "PathHelpers.h" +#include "skia/src/core/SkDraw.h" +#include "skia/src/core/SkGeometry.h" + +namespace mozilla::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)); + mCurrentPoint = aPoint; + mBeginPoint = aPoint; +} + +void PathBuilderSkia::LineTo(const Point& aPoint) { + if (!mPath.countPoints()) { + MoveTo(aPoint); + } else { + mPath.lineTo(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y)); + } + mCurrentPoint = aPoint; +} + +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)); + mCurrentPoint = aCP3; +} + +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)); + mCurrentPoint = aCP2; +} + +void PathBuilderSkia::Close() { + mPath.close(); + mCurrentPoint = mBeginPoint; +} + +void PathBuilderSkia::Arc(const Point& aOrigin, float aRadius, + float aStartAngle, float aEndAngle, + bool aAntiClockwise) { + ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle, + aAntiClockwise); +} + +already_AddRefed<Path> PathBuilderSkia::Finish() { + RefPtr<Path> path = + MakeAndAddRef<PathSkia>(mPath, mFillRule, mCurrentPoint, mBeginPoint); + mCurrentPoint = Point(0.0, 0.0); + mBeginPoint = Point(0.0, 0.0); + return path.forget(); +} + +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 { + RefPtr<PathBuilderSkia> builder = + MakeAndAddRef<PathBuilderSkia>(aTransform, mPath, aFillRule); + + builder->mCurrentPoint = aTransform.TransformPoint(mCurrentPoint); + builder->mBeginPoint = aTransform.TransformPoint(mBeginPoint); + + return builder.forget(); +} + +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); +} + +float ComputeResScaleForStroking(const Matrix& aTransform) { + SkMatrix skiaMatrix; + GfxMatrixToSkiaMatrix(aTransform, skiaMatrix); + return SkDraw::ComputeResScaleForStroking(skiaMatrix); +} + +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, nullptr, + ComputeResScaleForStroking(aTransform)); + + 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); +} + +Rect PathSkia::GetFastBounds(const Matrix& aTransform, + const StrokeOptions* aStrokeOptions) const { + if (!mPath.isFinite()) { + return Rect(); + } + SkRect bounds = mPath.getBounds(); + if (aStrokeOptions) { + // If the path is stroked, ensure that the bounds are inflated by any + // relevant options such as line width. Avoid using dash path effects + // for performance and to ensure computeFastStrokeBounds succeeds. + SkPaint paint; + if (!StrokeOptionsToPaint(paint, *aStrokeOptions, false)) { + return Rect(); + } + SkRect outBounds = SkRect::MakeEmpty(); + bounds = paint.computeFastStrokeBounds(bounds, &outBounds); + } + return aTransform.TransformBounds(SkRectToRect(bounds)); +} + +int ConvertConicToQuads(const Point& aP0, const Point& aP1, const Point& aP2, + float aWeight, std::vector<Point>& aQuads) { + SkConic conic(PointToSkPoint(aP0), PointToSkPoint(aP1), PointToSkPoint(aP2), + aWeight); + int pow2 = conic.computeQuadPOW2(0.25f); + aQuads.resize(1 + 2 * (1 << pow2)); + int numQuads = + conic.chopIntoQuadsPOW2(reinterpret_cast<SkPoint*>(&aQuads[0]), pow2); + if (numQuads < 1 << pow2) { + aQuads.resize(1 + 2 * numQuads); + } + return numQuads; +} + +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::kConic_Verb: { + std::vector<Point> quads; + int numQuads = ConvertConicToQuads( + SkPointToPoint(points[0]), SkPointToPoint(points[1]), + SkPointToPoint(points[2]), iter.conicWeight(), quads); + for (int i = 0; i < numQuads; i++) { + aSink->QuadraticBezierTo(quads[2 * i + 1], quads[2 * i + 2]); + } + break; + } + case SkPath::kClose_Verb: + aSink->Close(); + break; + default: + MOZ_ASSERT(false); + // Unexpected verb found in path! + } + } +} + +Maybe<Rect> PathSkia::AsRect() const { + SkRect rect; + if (mPath.isRect(&rect)) { + return Some(SkRectToRect(rect)); + } + return Nothing(); +} +} // namespace mozilla::gfx |