1 files changed, 237 insertions, 0 deletions
diff --git a/gfx/2d/PathRecording.h b/gfx/2d/PathRecording.h
new file mode 100644
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+++ b/gfx/2d/PathRecording.h
@@ -0,0 +1,237 @@
+/* -*- 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/. */
+
+#ifndef MOZILLA_GFX_PATHRECORDING_H_
+#define MOZILLA_GFX_PATHRECORDING_H_
+
+#include "2D.h"
+#include <vector>
+#include <ostream>
+
+#include "PathHelpers.h"
+#include "RecordingTypes.h"
+
+namespace mozilla {
+namespace gfx {
+
+class PathOps {
+ public:
+  PathOps() = default;
+
+  template <class S>
+  explicit PathOps(S& aStream);
+
+  PathOps(const PathOps& aOther) = default;
+  PathOps& operator=(const PathOps&) = delete;  // assign using std::move()!
+
+  PathOps(PathOps&& aOther) = default;
+  PathOps& operator=(PathOps&& aOther) = default;
+
+  template <class S>
+  void Record(S& aStream) const;
+
+  bool StreamToSink(PathSink& aPathSink) const;
+
+  PathOps TransformedCopy(const Matrix& aTransform) const;
+
+  size_t NumberOfOps() const;
+
+  void MoveTo(const Point& aPoint) { AppendPathOp(OpType::OP_MOVETO, aPoint); }
+
+  void LineTo(const Point& aPoint) { AppendPathOp(OpType::OP_LINETO, aPoint); }
+
+  void BezierTo(const Point& aCP1, const Point& aCP2, const Point& aCP3) {
+    AppendPathOp(OpType::OP_BEZIERTO, ThreePoints{aCP1, aCP2, aCP3});
+  }
+
+  void QuadraticBezierTo(const Point& aCP1, const Point& aCP2) {
+    AppendPathOp(OpType::OP_QUADRATICBEZIERTO, TwoPoints{aCP1, aCP2});
+  }
+
+  void Arc(const Point& aOrigin, float aRadius, float aStartAngle,
+           float aEndAngle, bool aAntiClockwise) {
+    AppendPathOp(OpType::OP_ARC, ArcParams{aOrigin, aRadius, aStartAngle,
+                                           aEndAngle, aAntiClockwise});
+  }
+
+  void Close() {
+    size_t oldSize = mPathData.size();
+    mPathData.resize(oldSize + sizeof(OpType));
+    *reinterpret_cast<OpType*>(mPathData.data() + oldSize) = OpType::OP_CLOSE;
+  }
+
+ private:
+  enum class OpType : uint32_t {
+    OP_MOVETO = 0,
+    OP_LINETO,
+    OP_BEZIERTO,
+    OP_QUADRATICBEZIERTO,
+    OP_ARC,
+    OP_CLOSE,
+    OP_INVALID
+  };
+
+  template <typename T>
+  void AppendPathOp(const OpType& aOpType, const T& aOpParams) {
+    size_t oldSize = mPathData.size();
+    mPathData.resize(oldSize + sizeof(OpType) + sizeof(T));
+    memcpy(mPathData.data() + oldSize, &aOpType, sizeof(OpType));
+    oldSize += sizeof(OpType);
+    memcpy(mPathData.data() + oldSize, &aOpParams, sizeof(T));
+  }
+
+  struct TwoPoints {
+    Point p1;
+    Point p2;
+  };
+
+  struct ThreePoints {
+    Point p1;
+    Point p2;
+    Point p3;
+  };
+
+  struct ArcParams {
+    Point origin;
+    float radius;
+    float startAngle;
+    float endAngle;
+    bool antiClockwise;
+  };
+
+  std::vector<uint8_t> mPathData;
+};
+
+template <class S>
+PathOps::PathOps(S& aStream) {
+  ReadVector(aStream, mPathData);
+}
+
+template <class S>
+inline void PathOps::Record(S& aStream) const {
+  WriteVector(aStream, mPathData);
+}
+
+class PathRecording;
+class DrawEventRecorderPrivate;
+
+class PathBuilderRecording final : public PathBuilder {
+ public:
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(PathBuilderRecording, override)
+
+  PathBuilderRecording(PathBuilder* aBuilder, FillRule aFillRule)
+      : mPathBuilder(aBuilder), mFillRule(aFillRule) {}
+
+  PathBuilderRecording(PathBuilder* aBuilder, const PathOps& aPathOps,
+                       FillRule aFillRule)
+      : mPathBuilder(aBuilder), mFillRule(aFillRule), mPathOps(aPathOps) {}
+
+  /* Move the current point in the path, any figure currently being drawn will
+   * be considered closed during fill operations, however when stroking the
+   * closing line segment will not be drawn.
+   */
+  void MoveTo(const Point& aPoint) final;
+
+  /* Add a linesegment to the current figure */
+  void LineTo(const Point& aPoint) final;
+
+  /* Add a cubic bezier curve to the current figure */
+  void BezierTo(const Point& aCP1, const Point& aCP2, const Point& aCP3) final;
+
+  /* Add a quadratic bezier curve to the current figure */
+  void QuadraticBezierTo(const Point& aCP1, const Point& aCP2) final;
+
+  /* Close the current figure, this will essentially generate a line segment
+   * from the current point to the starting point for the current figure
+   */
+  void Close() final;
+
+  /* Add an arc to the current figure */
+  void Arc(const Point& aOrigin, float aRadius, float aStartAngle,
+           float aEndAngle, bool aAntiClockwise) final;
+
+  /* Point the current subpath is at - or where the next subpath will start
+   * if there is no active subpath.
+   */
+  Point CurrentPoint() const final { return mPathBuilder->CurrentPoint(); }
+
+  Point BeginPoint() const final { return mPathBuilder->BeginPoint(); }
+
+  void SetCurrentPoint(const Point& aPoint) final {
+    mPathBuilder->SetCurrentPoint(aPoint);
+  }
+
+  void SetBeginPoint(const Point& aPoint) final {
+    mPathBuilder->SetBeginPoint(aPoint);
+  }
+
+  already_AddRefed<Path> Finish() final;
+
+  BackendType GetBackendType() const final { return BackendType::RECORDING; }
+
+ private:
+  RefPtr<PathBuilder> mPathBuilder;
+  FillRule mFillRule;
+  PathOps mPathOps;
+};
+
+class PathRecording final : public Path {
+ public:
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(PathRecording, override)
+
+  PathRecording(Path* aPath, PathOps&& aOps, FillRule aFillRule,
+                const Point& aCurrentPoint, const Point& aBeginPoint);
+
+  ~PathRecording();
+
+  BackendType GetBackendType() const final { return BackendType::RECORDING; }
+  already_AddRefed<PathBuilder> CopyToBuilder(FillRule aFillRule) const final;
+  already_AddRefed<PathBuilder> TransformedCopyToBuilder(
+      const Matrix& aTransform, FillRule aFillRule) const final;
+  bool ContainsPoint(const Point& aPoint,
+                     const Matrix& aTransform) const final {
+    return mPath->ContainsPoint(aPoint, aTransform);
+  }
+  bool StrokeContainsPoint(const StrokeOptions& aStrokeOptions,
+                           const Point& aPoint,
+                           const Matrix& aTransform) const final {
+    return mPath->StrokeContainsPoint(aStrokeOptions, aPoint, aTransform);
+  }
+
+  Rect GetBounds(const Matrix& aTransform = Matrix()) const final {
+    return mPath->GetBounds(aTransform);
+  }
+
+  Rect GetStrokedBounds(const StrokeOptions& aStrokeOptions,
+                        const Matrix& aTransform = Matrix()) const final {
+    return mPath->GetStrokedBounds(aStrokeOptions, aTransform);
+  }
+
+  Maybe<Rect> AsRect() const final { return mPath->AsRect(); }
+
+  void StreamToSink(PathSink* aSink) const final { mPath->StreamToSink(aSink); }
+
+  FillRule GetFillRule() const final { return mFillRule; }
+
+ private:
+  friend class DrawTargetWrapAndRecord;
+  friend class DrawTargetRecording;
+  friend class RecordedPathCreation;
+
+  RefPtr<Path> mPath;
+  PathOps mPathOps;
+  FillRule mFillRule;
+  Point mCurrentPoint;
+  Point mBeginPoint;
+
+  // Event recorders that have this path in their event stream.
+  std::vector<RefPtr<DrawEventRecorderPrivate>> mStoredRecorders;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_PATHRECORDING_H_ */