From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 gfx/2d/PathCG.cpp | 435 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 435 insertions(+)
 create mode 100644 gfx/2d/PathCG.cpp

(limited to 'gfx/2d/PathCG.cpp')

diff --git a/gfx/2d/PathCG.cpp b/gfx/2d/PathCG.cpp
new file mode 100644
index 000000000..4d70b2607
--- /dev/null
+++ b/gfx/2d/PathCG.cpp
@@ -0,0 +1,435 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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 "PathCG.h"
+#include <math.h>
+#include "Logging.h"
+#include "PathHelpers.h"
+
+namespace mozilla {
+namespace gfx {
+
+static inline Rect
+CGRectToRect(CGRect rect)
+{
+  return Rect(rect.origin.x,
+              rect.origin.y,
+              rect.size.width,
+              rect.size.height);
+}
+
+static inline Point
+CGPointToPoint(CGPoint point)
+{
+  return Point(point.x, point.y);
+}
+
+static inline void
+SetStrokeOptions(CGContextRef cg, const StrokeOptions &aStrokeOptions)
+{
+  switch (aStrokeOptions.mLineCap)
+  {
+    case CapStyle::BUTT:
+      CGContextSetLineCap(cg, kCGLineCapButt);
+      break;
+    case CapStyle::ROUND:
+      CGContextSetLineCap(cg, kCGLineCapRound);
+      break;
+    case CapStyle::SQUARE:
+      CGContextSetLineCap(cg, kCGLineCapSquare);
+      break;
+  }
+ 
+  switch (aStrokeOptions.mLineJoin)
+  {
+    case JoinStyle::BEVEL:
+      CGContextSetLineJoin(cg, kCGLineJoinBevel);
+      break;
+    case JoinStyle::ROUND:
+      CGContextSetLineJoin(cg, kCGLineJoinRound);
+      break;
+    case JoinStyle::MITER:
+    case JoinStyle::MITER_OR_BEVEL:
+      CGContextSetLineJoin(cg, kCGLineJoinMiter);
+      break;
+  }
+ 
+  CGContextSetLineWidth(cg, aStrokeOptions.mLineWidth);
+  CGContextSetMiterLimit(cg, aStrokeOptions.mMiterLimit);
+ 
+  // XXX: rename mDashLength to dashLength
+  if (aStrokeOptions.mDashLength > 0) {
+    // we use a regular array instead of a std::vector here because we don't want to leak the <vector> include
+    CGFloat *dashes = new CGFloat[aStrokeOptions.mDashLength];
+    for (size_t i=0; i<aStrokeOptions.mDashLength; i++) {
+      dashes[i] = aStrokeOptions.mDashPattern[i];
+    }
+    CGContextSetLineDash(cg, aStrokeOptions.mDashOffset, dashes, aStrokeOptions.mDashLength);
+    delete[] dashes;
+  }
+}
+
+static inline CGAffineTransform
+GfxMatrixToCGAffineTransform(const Matrix &m)
+{
+  CGAffineTransform t;
+  t.a = m._11;
+  t.b = m._12;
+  t.c = m._21;
+  t.d = m._22;
+  t.tx = m._31;
+  t.ty = m._32;
+  return t;
+}
+
+PathBuilderCG::~PathBuilderCG()
+{
+  CGPathRelease(mCGPath);
+}
+
+void
+PathBuilderCG::MoveTo(const Point &aPoint)
+{
+  if (!aPoint.IsFinite()) {
+    return;
+  }
+  CGPathMoveToPoint(mCGPath, nullptr, aPoint.x, aPoint.y);
+}
+
+void
+PathBuilderCG::LineTo(const Point &aPoint)
+{
+  if (!aPoint.IsFinite()) {
+    return;
+  }
+
+  if (CGPathIsEmpty(mCGPath))
+    MoveTo(aPoint);
+  else
+    CGPathAddLineToPoint(mCGPath, nullptr, aPoint.x, aPoint.y);
+}
+
+void
+PathBuilderCG::BezierTo(const Point &aCP1,
+                         const Point &aCP2,
+                         const Point &aCP3)
+{
+  if (!aCP1.IsFinite() || !aCP2.IsFinite() || !aCP3.IsFinite()) {
+    return;
+  }
+
+  if (CGPathIsEmpty(mCGPath))
+    MoveTo(aCP1);
+  CGPathAddCurveToPoint(mCGPath, nullptr,
+                          aCP1.x, aCP1.y,
+                          aCP2.x, aCP2.y,
+                          aCP3.x, aCP3.y);
+
+}
+
+void
+PathBuilderCG::QuadraticBezierTo(const Point &aCP1,
+                                 const Point &aCP2)
+{
+  if (!aCP1.IsFinite() || !aCP2.IsFinite()) {
+    return;
+  }
+
+  if (CGPathIsEmpty(mCGPath))
+    MoveTo(aCP1);
+  CGPathAddQuadCurveToPoint(mCGPath, nullptr,
+                            aCP1.x, aCP1.y,
+                            aCP2.x, aCP2.y);
+}
+
+void
+PathBuilderCG::Close()
+{
+  if (!CGPathIsEmpty(mCGPath))
+    CGPathCloseSubpath(mCGPath);
+}
+
+void
+PathBuilderCG::Arc(const Point &aOrigin, Float aRadius, Float aStartAngle,
+                 Float aEndAngle, bool aAntiClockwise)
+{
+  if (!aOrigin.IsFinite() || !IsFinite(aRadius) ||
+      !IsFinite(aStartAngle) || !IsFinite(aEndAngle)) {
+    return;
+  }
+
+  // Disabled for now due to a CG bug when using CGPathAddArc with stroke
+  // dashing and rotation transforms that are multiples of 90 degrees. See:
+  // https://bugzilla.mozilla.org/show_bug.cgi?id=949661#c8
+#if 0
+  // Core Graphic's initial coordinate system is y-axis up, whereas Moz2D's is
+  // y-axis down. Core Graphics therefore considers "clockwise" to mean "sweep
+  // in the direction of decreasing angle" whereas Moz2D considers it to mean
+  // "sweep in the direction of increasing angle". In other words if this
+  // Moz2D method is instructed to sweep anti-clockwise we need to tell
+  // CGPathAddArc to sweep clockwise, and vice versa. Hence why we pass the
+  // value of aAntiClockwise directly to CGPathAddArc's "clockwise" bool
+  // parameter.
+  CGPathAddArc(mCGPath, nullptr,
+               aOrigin.x, aOrigin.y,
+               aRadius,
+               aStartAngle,
+               aEndAngle,
+               aAntiClockwise);
+#endif
+  ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle,
+              aAntiClockwise);
+}
+
+Point
+PathBuilderCG::CurrentPoint() const
+{
+  Point ret;
+  if (!CGPathIsEmpty(mCGPath)) {
+    CGPoint pt = CGPathGetCurrentPoint(mCGPath);
+    ret.MoveTo(pt.x, pt.y);
+  }
+  return ret;
+}
+
+void
+PathBuilderCG::EnsureActive(const Point &aPoint)
+{
+}
+
+already_AddRefed<Path>
+PathBuilderCG::Finish()
+{
+  return MakeAndAddRef<PathCG>(mCGPath, mFillRule);
+}
+
+already_AddRefed<PathBuilder>
+PathCG::CopyToBuilder(FillRule aFillRule) const
+{
+  CGMutablePathRef path = CGPathCreateMutableCopy(mPath);
+  return MakeAndAddRef<PathBuilderCG>(path, aFillRule);
+}
+
+
+
+already_AddRefed<PathBuilder>
+PathCG::TransformedCopyToBuilder(const Matrix &aTransform, FillRule aFillRule) const
+{
+  // 10.7 adds CGPathCreateMutableCopyByTransformingPath it might be faster than doing
+  // this by hand
+
+  struct TransformApplier {
+    CGMutablePathRef path;
+    CGAffineTransform transform;
+    static void
+    TranformCGPathApplierFunc(void *vinfo, const CGPathElement *element)
+    {
+      TransformApplier *info = reinterpret_cast<TransformApplier*>(vinfo);
+      switch (element->type) {
+        case kCGPathElementMoveToPoint:
+          {
+            CGPoint pt = element->points[0];
+            CGPathMoveToPoint(info->path, &info->transform, pt.x, pt.y);
+            break;
+          }
+        case kCGPathElementAddLineToPoint:
+          {
+            CGPoint pt = element->points[0];
+            CGPathAddLineToPoint(info->path, &info->transform, pt.x, pt.y);
+            break;
+          }
+        case kCGPathElementAddQuadCurveToPoint:
+          {
+            CGPoint cpt = element->points[0];
+            CGPoint pt  = element->points[1];
+            CGPathAddQuadCurveToPoint(info->path, &info->transform, cpt.x, cpt.y, pt.x, pt.y);
+            break;
+          }
+        case kCGPathElementAddCurveToPoint:
+          {
+            CGPoint cpt1 = element->points[0];
+            CGPoint cpt2 = element->points[1];
+            CGPoint pt   = element->points[2];
+            CGPathAddCurveToPoint(info->path, &info->transform, cpt1.x, cpt1.y, cpt2.x, cpt2.y, pt.x, pt.y);
+            break;
+          }
+        case kCGPathElementCloseSubpath:
+          {
+            CGPathCloseSubpath(info->path);
+            break;
+          }
+      }
+    }
+  };
+
+  TransformApplier ta;
+  ta.path = CGPathCreateMutable();
+  ta.transform = GfxMatrixToCGAffineTransform(aTransform);
+
+  CGPathApply(mPath, &ta, TransformApplier::TranformCGPathApplierFunc);
+  return MakeAndAddRef<PathBuilderCG>(ta.path, aFillRule);
+}
+
+static void
+StreamPathToSinkApplierFunc(void *vinfo, const CGPathElement *element)
+{
+  PathSink *sink = reinterpret_cast<PathSink*>(vinfo);
+  switch (element->type) {
+    case kCGPathElementMoveToPoint:
+      {
+        CGPoint pt = element->points[0];
+        sink->MoveTo(CGPointToPoint(pt));
+        break;
+      }
+    case kCGPathElementAddLineToPoint:
+      {
+        CGPoint pt = element->points[0];
+        sink->LineTo(CGPointToPoint(pt));
+        break;
+      }
+    case kCGPathElementAddQuadCurveToPoint:
+      {
+        CGPoint cpt = element->points[0];
+        CGPoint pt  = element->points[1];
+        sink->QuadraticBezierTo(CGPointToPoint(cpt),
+                                CGPointToPoint(pt));
+        break;
+      }
+    case kCGPathElementAddCurveToPoint:
+      {
+        CGPoint cpt1 = element->points[0];
+        CGPoint cpt2 = element->points[1];
+        CGPoint pt   = element->points[2];
+        sink->BezierTo(CGPointToPoint(cpt1),
+                       CGPointToPoint(cpt2),
+                       CGPointToPoint(pt));
+        break;
+      }
+    case kCGPathElementCloseSubpath:
+      {
+        sink->Close();
+        break;
+      }
+  }
+}
+
+void
+PathCG::StreamToSink(PathSink *aSink) const
+{
+  CGPathApply(mPath, aSink, StreamPathToSinkApplierFunc);
+}
+
+bool
+PathCG::ContainsPoint(const Point &aPoint, const Matrix &aTransform) const
+{
+  Matrix inverse = aTransform;
+  inverse.Invert();
+  Point transformedPoint = inverse.TransformPoint(aPoint);
+  // We could probably drop the input transform and just transform the point at the caller?
+  CGPoint point = {transformedPoint.x, transformedPoint.y};
+
+  // The transform parameter of CGPathContainsPoint doesn't seem to work properly on OS X 10.5
+  // so we transform aPoint ourselves.
+  return CGPathContainsPoint(mPath, nullptr, point, mFillRule == FillRule::FILL_EVEN_ODD);
+}
+
+static size_t
+PutBytesNull(void *info, const void *buffer, size_t count)
+{
+  return count;
+}
+
+/* The idea of a scratch context comes from WebKit */
+static CGContextRef
+CreateScratchContext()
+{
+  CGDataConsumerCallbacks callbacks = {PutBytesNull, nullptr};
+  CGDataConsumerRef consumer = CGDataConsumerCreate(nullptr, &callbacks);
+  CGContextRef cg = CGPDFContextCreate(consumer, nullptr, nullptr);
+  CGDataConsumerRelease(consumer);
+  return cg;
+}
+
+static CGContextRef
+ScratchContext()
+{
+  static CGContextRef cg = CreateScratchContext();
+  return cg;
+}
+
+bool
+PathCG::StrokeContainsPoint(const StrokeOptions &aStrokeOptions,
+                            const Point &aPoint,
+                            const Matrix &aTransform) const
+{
+  Matrix inverse = aTransform;
+  inverse.Invert();
+  Point transformedPoint = inverse.TransformPoint(aPoint);
+  // We could probably drop the input transform and just transform the point at the caller?
+  CGPoint point = {transformedPoint.x, transformedPoint.y};
+
+  CGContextRef cg = ScratchContext();
+
+  CGContextSaveGState(cg);
+
+  CGContextBeginPath(cg);
+  CGContextAddPath(cg, mPath);
+
+  SetStrokeOptions(cg, aStrokeOptions);
+
+  CGContextReplacePathWithStrokedPath(cg);
+  CGContextRestoreGState(cg);
+
+  CGPathRef sPath = CGContextCopyPath(cg);
+  bool inStroke = CGPathContainsPoint(sPath, nullptr, point, false);
+  CGPathRelease(sPath);
+
+  return inStroke;
+}
+
+//XXX: what should these functions return for an empty path?
+// currently they return CGRectNull {inf,inf, 0, 0}
+Rect
+PathCG::GetBounds(const Matrix &aTransform) const
+{
+  //XXX: are these bounds tight enough
+  Rect bounds = CGRectToRect(CGPathGetBoundingBox(mPath));
+
+  //XXX: currently this returns the bounds of the transformed bounds
+  // this is strictly looser than the bounds of the transformed path
+  return aTransform.TransformBounds(bounds);
+}
+
+Rect
+PathCG::GetStrokedBounds(const StrokeOptions &aStrokeOptions,
+                         const Matrix &aTransform) const
+{
+  // 10.7 has CGPathCreateCopyByStrokingPath which we could use
+  // instead of this scratch context business
+  CGContextRef cg = ScratchContext();
+
+  CGContextSaveGState(cg);
+
+  CGContextBeginPath(cg);
+  CGContextAddPath(cg, mPath);
+
+  SetStrokeOptions(cg, aStrokeOptions);
+
+  CGContextReplacePathWithStrokedPath(cg);
+  Rect bounds = CGRectToRect(CGContextGetPathBoundingBox(cg));
+
+  CGContextRestoreGState(cg);
+
+  if (!bounds.IsFinite()) {
+    return Rect();
+  }
+
+  return aTransform.TransformBounds(bounds);
+}
+
+
+} // namespace gfx
+
+} // namespace mozilla
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