1 files changed, 422 insertions, 0 deletions
diff --git a/gfx/2d/PathD2D.cpp b/gfx/2d/PathD2D.cpp
new file mode 100644
index 0000000000..d46006f650
--- /dev/null
+++ b/gfx/2d/PathD2D.cpp
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+/* -*- 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 "PathD2D.h"
+#include "HelpersD2D.h"
+#include <math.h>
+#include "DrawTargetD2D1.h"
+#include "Logging.h"
+
+namespace mozilla {
+namespace gfx {
+
+already_AddRefed<PathBuilder> PathBuilderD2D::Create(FillRule aFillRule) {
+  RefPtr<ID2D1PathGeometry> path;
+  HRESULT hr =
+      DrawTargetD2D1::factory()->CreatePathGeometry(getter_AddRefs(path));
+
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to create Direct2D Path Geometry. Code: "
+                 << hexa(hr);
+    return nullptr;
+  }
+
+  RefPtr<ID2D1GeometrySink> sink;
+  hr = path->Open(getter_AddRefs(sink));
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to access Direct2D Path Geometry. Code: "
+                 << hexa(hr);
+    return nullptr;
+  }
+
+  if (aFillRule == FillRule::FILL_WINDING) {
+    sink->SetFillMode(D2D1_FILL_MODE_WINDING);
+  }
+
+  return MakeAndAddRef<PathBuilderD2D>(sink, path, aFillRule,
+                                       BackendType::DIRECT2D1_1);
+}
+
+// This class exists as a wrapper for ID2D1SimplifiedGeometry sink, it allows
+// a geometry to be duplicated into a geometry sink, while removing the final
+// figure end and thus allowing a figure that was implicitly closed to be
+// continued.
+class OpeningGeometrySink : public ID2D1SimplifiedGeometrySink {
+ public:
+  explicit OpeningGeometrySink(ID2D1SimplifiedGeometrySink* aSink)
+      : mSink(aSink), mNeedsFigureEnded(false) {}
+
+  HRESULT STDMETHODCALLTYPE QueryInterface(const IID& aIID, void** aPtr) {
+    if (!aPtr) {
+      return E_POINTER;
+    }
+
+    if (aIID == IID_IUnknown) {
+      *aPtr = static_cast<IUnknown*>(this);
+      return S_OK;
+    } else if (aIID == IID_ID2D1SimplifiedGeometrySink) {
+      *aPtr = static_cast<ID2D1SimplifiedGeometrySink*>(this);
+      return S_OK;
+    }
+
+    return E_NOINTERFACE;
+  }
+
+  ULONG STDMETHODCALLTYPE AddRef() { return 1; }
+
+  ULONG STDMETHODCALLTYPE Release() { return 1; }
+
+  // We ignore SetFillMode, the copier will decide.
+  STDMETHOD_(void, SetFillMode)(D2D1_FILL_MODE aMode) {
+    EnsureFigureEnded();
+    return;
+  }
+  STDMETHOD_(void, BeginFigure)
+  (D2D1_POINT_2F aPoint, D2D1_FIGURE_BEGIN aBegin) {
+    EnsureFigureEnded();
+    return mSink->BeginFigure(aPoint, aBegin);
+  }
+  STDMETHOD_(void, AddLines)(const D2D1_POINT_2F* aLines, UINT aCount) {
+    EnsureFigureEnded();
+    return mSink->AddLines(aLines, aCount);
+  }
+  STDMETHOD_(void, AddBeziers)
+  (const D2D1_BEZIER_SEGMENT* aSegments, UINT aCount) {
+    EnsureFigureEnded();
+    return mSink->AddBeziers(aSegments, aCount);
+  }
+  STDMETHOD(Close)() { /* Should never be called! */
+    return S_OK;
+  }
+  STDMETHOD_(void, SetSegmentFlags)(D2D1_PATH_SEGMENT aFlags) {
+    return mSink->SetSegmentFlags(aFlags);
+  }
+
+  // This function is special - it's the reason this class exists.
+  // It needs to intercept the very last endfigure. So that a user can
+  // continue writing to this sink as if they never stopped.
+  STDMETHOD_(void, EndFigure)(D2D1_FIGURE_END aEnd) {
+    if (aEnd == D2D1_FIGURE_END_CLOSED) {
+      return mSink->EndFigure(aEnd);
+    } else {
+      mNeedsFigureEnded = true;
+    }
+  }
+
+ private:
+  void EnsureFigureEnded() {
+    if (mNeedsFigureEnded) {
+      mSink->EndFigure(D2D1_FIGURE_END_OPEN);
+      mNeedsFigureEnded = false;
+    }
+  }
+
+  ID2D1SimplifiedGeometrySink* mSink;
+  bool mNeedsFigureEnded;
+};
+
+PathBuilderD2D::~PathBuilderD2D() {}
+
+void PathBuilderD2D::MoveTo(const Point& aPoint) {
+  if (mFigureActive) {
+    mSink->EndFigure(D2D1_FIGURE_END_OPEN);
+    mFigureActive = false;
+  }
+  EnsureActive(aPoint);
+  mCurrentPoint = aPoint;
+}
+
+void PathBuilderD2D::LineTo(const Point& aPoint) {
+  EnsureActive(aPoint);
+  mSink->AddLine(D2DPoint(aPoint));
+
+  mCurrentPoint = aPoint;
+}
+
+void PathBuilderD2D::BezierTo(const Point& aCP1, const Point& aCP2,
+                              const Point& aCP3) {
+  EnsureActive(aCP1);
+  mSink->AddBezier(
+      D2D1::BezierSegment(D2DPoint(aCP1), D2DPoint(aCP2), D2DPoint(aCP3)));
+
+  mCurrentPoint = aCP3;
+}
+
+void PathBuilderD2D::QuadraticBezierTo(const Point& aCP1, const Point& aCP2) {
+  EnsureActive(aCP1);
+  mSink->AddQuadraticBezier(
+      D2D1::QuadraticBezierSegment(D2DPoint(aCP1), D2DPoint(aCP2)));
+
+  mCurrentPoint = aCP2;
+}
+
+void PathBuilderD2D::Close() {
+  if (mFigureActive) {
+    mSink->EndFigure(D2D1_FIGURE_END_CLOSED);
+
+    mFigureActive = false;
+
+    EnsureActive(mBeginPoint);
+  }
+}
+
+void PathBuilderD2D::Arc(const Point& aOrigin, Float aRadius, Float aStartAngle,
+                         Float aEndAngle, bool aAntiClockwise) {
+  MOZ_ASSERT(aRadius >= 0);
+
+  if (aAntiClockwise && aStartAngle < aEndAngle) {
+    // D2D does things a little differently, and draws the arc by specifying an
+    // beginning and an end point. This means the circle will be the wrong way
+    // around if the start angle is smaller than the end angle. It might seem
+    // tempting to invert aAntiClockwise but that would change the sweeping
+    // direction of the arc so instead we exchange start/begin.
+    Float oldStart = aStartAngle;
+    aStartAngle = aEndAngle;
+    aEndAngle = oldStart;
+  }
+
+  // XXX - Workaround for now, D2D does not appear to do the desired thing when
+  // the angle sweeps a complete circle.
+  bool fullCircle = false;
+  if (aEndAngle - aStartAngle >= 2 * M_PI) {
+    fullCircle = true;
+    aEndAngle = Float(aStartAngle + M_PI * 1.9999);
+  } else if (aStartAngle - aEndAngle >= 2 * M_PI) {
+    fullCircle = true;
+    aStartAngle = Float(aEndAngle + M_PI * 1.9999);
+  }
+
+  Point startPoint;
+  startPoint.x = aOrigin.x + aRadius * cos(aStartAngle);
+  startPoint.y = aOrigin.y + aRadius * sin(aStartAngle);
+
+  if (!mFigureActive) {
+    EnsureActive(startPoint);
+  } else {
+    mSink->AddLine(D2DPoint(startPoint));
+  }
+
+  Point endPoint;
+  endPoint.x = aOrigin.x + aRadius * cosf(aEndAngle);
+  endPoint.y = aOrigin.y + aRadius * sinf(aEndAngle);
+
+  D2D1_ARC_SIZE arcSize = D2D1_ARC_SIZE_SMALL;
+  D2D1_SWEEP_DIRECTION direction = aAntiClockwise
+                                       ? D2D1_SWEEP_DIRECTION_COUNTER_CLOCKWISE
+                                       : D2D1_SWEEP_DIRECTION_CLOCKWISE;
+
+  // if startPoint and endPoint of our circle are too close there are D2D issues
+  // with drawing the circle as a single arc
+  const Float kEpsilon = 1e-5f;
+  if (!fullCircle || (std::abs(startPoint.x - endPoint.x) +
+                          std::abs(startPoint.y - endPoint.y) >
+                      kEpsilon)) {
+    if (aAntiClockwise) {
+      if (aStartAngle - aEndAngle > M_PI) {
+        arcSize = D2D1_ARC_SIZE_LARGE;
+      }
+    } else {
+      if (aEndAngle - aStartAngle > M_PI) {
+        arcSize = D2D1_ARC_SIZE_LARGE;
+      }
+    }
+
+    mSink->AddArc(D2D1::ArcSegment(D2DPoint(endPoint),
+                                   D2D1::SizeF(aRadius, aRadius), 0.0f,
+                                   direction, arcSize));
+  } else {
+    // our first workaround attempt didn't work, so instead draw the circle as
+    // two half-circles
+    Float midAngle = aEndAngle > aStartAngle ? Float(aStartAngle + M_PI)
+                                             : Float(aEndAngle + M_PI);
+    Point midPoint;
+    midPoint.x = aOrigin.x + aRadius * cosf(midAngle);
+    midPoint.y = aOrigin.y + aRadius * sinf(midAngle);
+
+    mSink->AddArc(D2D1::ArcSegment(D2DPoint(midPoint),
+                                   D2D1::SizeF(aRadius, aRadius), 0.0f,
+                                   direction, arcSize));
+
+    // if the adjusted endPoint computed above is used here and endPoint !=
+    // startPoint then this half of the circle won't render...
+    mSink->AddArc(D2D1::ArcSegment(D2DPoint(startPoint),
+                                   D2D1::SizeF(aRadius, aRadius), 0.0f,
+                                   direction, arcSize));
+  }
+
+  mCurrentPoint = endPoint;
+}
+
+void PathBuilderD2D::EnsureActive(const Point& aPoint) {
+  if (!mFigureActive) {
+    mSink->BeginFigure(D2DPoint(aPoint), D2D1_FIGURE_BEGIN_FILLED);
+    mBeginPoint = aPoint;
+    mFigureActive = true;
+  }
+}
+
+already_AddRefed<Path> PathBuilderD2D::Finish() {
+  if (mFigureActive) {
+    mSink->EndFigure(D2D1_FIGURE_END_OPEN);
+  }
+
+  HRESULT hr = mSink->Close();
+  if (FAILED(hr)) {
+    gfxCriticalNote << "Failed to close PathSink. Code: " << hexa(hr);
+    return nullptr;
+  }
+
+  return MakeAndAddRef<PathD2D>(mGeometry, mFigureActive, mCurrentPoint,
+                                mFillRule, mBackendType);
+}
+
+already_AddRefed<PathBuilder> PathD2D::CopyToBuilder(FillRule aFillRule) const {
+  return TransformedCopyToBuilder(Matrix(), aFillRule);
+}
+
+already_AddRefed<PathBuilder> PathD2D::TransformedCopyToBuilder(
+    const Matrix& aTransform, FillRule aFillRule) const {
+  RefPtr<ID2D1PathGeometry> path;
+  HRESULT hr =
+      DrawTargetD2D1::factory()->CreatePathGeometry(getter_AddRefs(path));
+
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to create PathGeometry. Code: " << hexa(hr);
+    return nullptr;
+  }
+
+  RefPtr<ID2D1GeometrySink> sink;
+  hr = path->Open(getter_AddRefs(sink));
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to open Geometry for writing. Code: " << hexa(hr);
+    return nullptr;
+  }
+
+  if (aFillRule == FillRule::FILL_WINDING) {
+    sink->SetFillMode(D2D1_FILL_MODE_WINDING);
+  }
+
+  if (mEndedActive) {
+    OpeningGeometrySink wrapSink(sink);
+    hr = mGeometry->Simplify(
+        D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
+        D2DMatrix(aTransform), &wrapSink);
+  } else {
+    hr = mGeometry->Simplify(
+        D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
+        D2DMatrix(aTransform), sink);
+  }
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to simplify PathGeometry to tranformed copy. Code: "
+                 << hexa(hr) << " Active: " << mEndedActive;
+    return nullptr;
+  }
+
+  RefPtr<PathBuilderD2D> pathBuilder =
+      new PathBuilderD2D(sink, path, aFillRule, mBackendType);
+
+  pathBuilder->mCurrentPoint = aTransform.TransformPoint(mEndPoint);
+
+  if (mEndedActive) {
+    pathBuilder->mFigureActive = true;
+  }
+
+  return pathBuilder.forget();
+}
+
+void PathD2D::StreamToSink(PathSink* aSink) const {
+  HRESULT hr;
+
+  StreamingGeometrySink sink(aSink);
+
+  hr = mGeometry->Simplify(D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
+                           D2D1::IdentityMatrix(), &sink);
+
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to stream D2D path to sink. Code: " << hexa(hr);
+    return;
+  }
+}
+
+bool PathD2D::ContainsPoint(const Point& aPoint,
+                            const Matrix& aTransform) const {
+  if (!aTransform.Determinant()) {
+    // If the transform is not invertible, then don't consider point inside.
+    return false;
+  }
+
+  BOOL result;
+
+  HRESULT hr = mGeometry->FillContainsPoint(
+      D2DPoint(aPoint), D2DMatrix(aTransform), 0.001f, &result);
+
+  if (FAILED(hr)) {
+    // Log
+    return false;
+  }
+
+  return !!result;
+}
+
+bool PathD2D::StrokeContainsPoint(const StrokeOptions& aStrokeOptions,
+                                  const Point& aPoint,
+                                  const Matrix& aTransform) const {
+  if (!aTransform.Determinant()) {
+    // If the transform is not invertible, then don't consider point inside.
+    return false;
+  }
+
+  BOOL result;
+
+  RefPtr<ID2D1StrokeStyle> strokeStyle =
+      CreateStrokeStyleForOptions(aStrokeOptions);
+  HRESULT hr = mGeometry->StrokeContainsPoint(
+      D2DPoint(aPoint), aStrokeOptions.mLineWidth, strokeStyle,
+      D2DMatrix(aTransform), &result);
+
+  if (FAILED(hr)) {
+    // Log
+    return false;
+  }
+
+  return !!result;
+}
+
+Rect PathD2D::GetBounds(const Matrix& aTransform) const {
+  D2D1_RECT_F d2dBounds;
+
+  HRESULT hr = mGeometry->GetBounds(D2DMatrix(aTransform), &d2dBounds);
+
+  Rect bounds = ToRect(d2dBounds);
+  if (FAILED(hr) || !bounds.IsFinite()) {
+    gfxWarning() << "Failed to get stroked bounds for path. Code: " << hexa(hr);
+    return Rect();
+  }
+
+  return bounds;
+}
+
+Rect PathD2D::GetStrokedBounds(const StrokeOptions& aStrokeOptions,
+                               const Matrix& aTransform) const {
+  D2D1_RECT_F d2dBounds;
+
+  RefPtr<ID2D1StrokeStyle> strokeStyle =
+      CreateStrokeStyleForOptions(aStrokeOptions);
+  HRESULT hr =
+      mGeometry->GetWidenedBounds(aStrokeOptions.mLineWidth, strokeStyle,
+                                  D2DMatrix(aTransform), &d2dBounds);
+
+  Rect bounds = ToRect(d2dBounds);
+  if (FAILED(hr) || !bounds.IsFinite()) {
+    gfxWarning() << "Failed to get stroked bounds for path. Code: " << hexa(hr);
+    return Rect();
+  }
+
+  return bounds;
+}
+
+}  // namespace gfx
+}  // namespace mozilla