1 files changed, 315 insertions, 0 deletions
diff --git a/gfx/2d/PathCairo.cpp b/gfx/2d/PathCairo.cpp
new file mode 100644
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+++ b/gfx/2d/PathCairo.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 "PathCairo.h"
+#include <math.h>
+#include "DrawTargetCairo.h"
+#include "Logging.h"
+#include "PathHelpers.h"
+#include "HelpersCairo.h"
+
+namespace mozilla {
+namespace gfx {
+
+already_AddRefed<PathBuilder> PathBuilderCairo::Create(FillRule aFillRule) {
+  return MakeAndAddRef<PathBuilderCairo>(aFillRule);
+}
+
+PathBuilderCairo::PathBuilderCairo(FillRule aFillRule) : mFillRule(aFillRule) {}
+
+void PathBuilderCairo::MoveTo(const Point& aPoint) {
+  cairo_path_data_t data;
+  data.header.type = CAIRO_PATH_MOVE_TO;
+  data.header.length = 2;
+  mPathData.push_back(data);
+  data.point.x = aPoint.x;
+  data.point.y = aPoint.y;
+  mPathData.push_back(data);
+
+  mBeginPoint = mCurrentPoint = aPoint;
+}
+
+void PathBuilderCairo::LineTo(const Point& aPoint) {
+  cairo_path_data_t data;
+  data.header.type = CAIRO_PATH_LINE_TO;
+  data.header.length = 2;
+  mPathData.push_back(data);
+  data.point.x = aPoint.x;
+  data.point.y = aPoint.y;
+  mPathData.push_back(data);
+
+  mCurrentPoint = aPoint;
+}
+
+void PathBuilderCairo::BezierTo(const Point& aCP1, const Point& aCP2,
+                                const Point& aCP3) {
+  cairo_path_data_t data;
+  data.header.type = CAIRO_PATH_CURVE_TO;
+  data.header.length = 4;
+  mPathData.push_back(data);
+  data.point.x = aCP1.x;
+  data.point.y = aCP1.y;
+  mPathData.push_back(data);
+  data.point.x = aCP2.x;
+  data.point.y = aCP2.y;
+  mPathData.push_back(data);
+  data.point.x = aCP3.x;
+  data.point.y = aCP3.y;
+  mPathData.push_back(data);
+
+  mCurrentPoint = aCP3;
+}
+
+void PathBuilderCairo::QuadraticBezierTo(const Point& aCP1, const Point& aCP2) {
+  // We need to elevate the degree of this quadratic Bézier to cubic, so we're
+  // going to add an intermediate control point, and recompute control point 1.
+  // The first and last control points remain the same.
+  // This formula can be found on http://fontforge.sourceforge.net/bezier.html
+  Point CP0 = CurrentPoint();
+  Point CP1 = (CP0 + aCP1 * 2.0) / 3.0;
+  Point CP2 = (aCP2 + aCP1 * 2.0) / 3.0;
+  Point CP3 = aCP2;
+
+  cairo_path_data_t data;
+  data.header.type = CAIRO_PATH_CURVE_TO;
+  data.header.length = 4;
+  mPathData.push_back(data);
+  data.point.x = CP1.x;
+  data.point.y = CP1.y;
+  mPathData.push_back(data);
+  data.point.x = CP2.x;
+  data.point.y = CP2.y;
+  mPathData.push_back(data);
+  data.point.x = CP3.x;
+  data.point.y = CP3.y;
+  mPathData.push_back(data);
+
+  mCurrentPoint = aCP2;
+}
+
+void PathBuilderCairo::Close() {
+  cairo_path_data_t data;
+  data.header.type = CAIRO_PATH_CLOSE_PATH;
+  data.header.length = 1;
+  mPathData.push_back(data);
+
+  mCurrentPoint = mBeginPoint;
+}
+
+void PathBuilderCairo::Arc(const Point& aOrigin, float aRadius,
+                           float aStartAngle, float aEndAngle,
+                           bool aAntiClockwise) {
+  ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle,
+              aAntiClockwise);
+}
+
+already_AddRefed<Path> PathBuilderCairo::Finish() {
+  return MakeAndAddRef<PathCairo>(mFillRule, mPathData, mCurrentPoint,
+                                  mBeginPoint);
+}
+
+PathCairo::PathCairo(FillRule aFillRule,
+                     std::vector<cairo_path_data_t>& aPathData,
+                     const Point& aCurrentPoint, const Point& aBeginPoint)
+    : mFillRule(aFillRule),
+      mContainingContext(nullptr),
+      mCurrentPoint(aCurrentPoint),
+      mBeginPoint(aBeginPoint) {
+  mPathData.swap(aPathData);
+}
+
+PathCairo::PathCairo(cairo_t* aContext)
+    : mFillRule(FillRule::FILL_WINDING), mContainingContext(nullptr) {
+  cairo_path_t* path = cairo_copy_path(aContext);
+
+  // XXX - mCurrentPoint is not properly set here, the same is true for the
+  // D2D Path code, we never require current point when hitting this codepath
+  // but this should be fixed.
+  for (int i = 0; i < path->num_data; i++) {
+    mPathData.push_back(path->data[i]);
+  }
+
+  cairo_path_destroy(path);
+}
+
+PathCairo::~PathCairo() {
+  if (mContainingContext) {
+    cairo_destroy(mContainingContext);
+  }
+}
+
+already_AddRefed<PathBuilder> PathCairo::CopyToBuilder(
+    FillRule aFillRule) const {
+  RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(aFillRule);
+
+  builder->mPathData = mPathData;
+  builder->mCurrentPoint = mCurrentPoint;
+  builder->mBeginPoint = mBeginPoint;
+
+  return builder.forget();
+}
+
+already_AddRefed<PathBuilder> PathCairo::TransformedCopyToBuilder(
+    const Matrix& aTransform, FillRule aFillRule) const {
+  RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(aFillRule);
+
+  AppendPathToBuilder(builder, &aTransform);
+  builder->mCurrentPoint = aTransform.TransformPoint(mCurrentPoint);
+  builder->mBeginPoint = aTransform.TransformPoint(mBeginPoint);
+
+  return builder.forget();
+}
+
+bool PathCairo::ContainsPoint(const Point& aPoint,
+                              const Matrix& aTransform) const {
+  Matrix inverse = aTransform;
+  inverse.Invert();
+  Point transformed = inverse.TransformPoint(aPoint);
+
+  EnsureContainingContext(aTransform);
+
+  return cairo_in_fill(mContainingContext, transformed.x, transformed.y);
+}
+
+bool PathCairo::StrokeContainsPoint(const StrokeOptions& aStrokeOptions,
+                                    const Point& aPoint,
+                                    const Matrix& aTransform) const {
+  Matrix inverse = aTransform;
+  inverse.Invert();
+  Point transformed = inverse.TransformPoint(aPoint);
+
+  EnsureContainingContext(aTransform);
+
+  SetCairoStrokeOptions(mContainingContext, aStrokeOptions);
+
+  return cairo_in_stroke(mContainingContext, transformed.x, transformed.y);
+}
+
+Rect PathCairo::GetBounds(const Matrix& aTransform) const {
+  EnsureContainingContext(aTransform);
+
+  double x1, y1, x2, y2;
+
+  cairo_path_extents(mContainingContext, &x1, &y1, &x2, &y2);
+  Rect bounds(Float(x1), Float(y1), Float(x2 - x1), Float(y2 - y1));
+  return aTransform.TransformBounds(bounds);
+}
+
+Rect PathCairo::GetStrokedBounds(const StrokeOptions& aStrokeOptions,
+                                 const Matrix& aTransform) const {
+  EnsureContainingContext(aTransform);
+
+  double x1, y1, x2, y2;
+
+  SetCairoStrokeOptions(mContainingContext, aStrokeOptions);
+
+  cairo_stroke_extents(mContainingContext, &x1, &y1, &x2, &y2);
+  Rect bounds((Float)x1, (Float)y1, (Float)(x2 - x1), (Float)(y2 - y1));
+  return aTransform.TransformBounds(bounds);
+}
+
+void PathCairo::StreamToSink(PathSink* aSink) const {
+  for (size_t i = 0; i < mPathData.size(); i++) {
+    switch (mPathData[i].header.type) {
+      case CAIRO_PATH_MOVE_TO:
+        i++;
+        aSink->MoveTo(Point(mPathData[i].point.x, mPathData[i].point.y));
+        break;
+      case CAIRO_PATH_LINE_TO:
+        i++;
+        aSink->LineTo(Point(mPathData[i].point.x, mPathData[i].point.y));
+        break;
+      case CAIRO_PATH_CURVE_TO:
+        aSink->BezierTo(
+            Point(mPathData[i + 1].point.x, mPathData[i + 1].point.y),
+            Point(mPathData[i + 2].point.x, mPathData[i + 2].point.y),
+            Point(mPathData[i + 3].point.x, mPathData[i + 3].point.y));
+        i += 3;
+        break;
+      case CAIRO_PATH_CLOSE_PATH:
+        aSink->Close();
+        break;
+      default:
+        // Corrupt path data!
+        MOZ_ASSERT(false);
+    }
+  }
+}
+
+bool PathCairo::IsEmpty() const {
+  for (size_t i = 0; i < mPathData.size(); i++) {
+    switch (mPathData[i].header.type) {
+      case CAIRO_PATH_MOVE_TO:
+        break;
+      case CAIRO_PATH_CLOSE_PATH:
+        break;
+      default:
+        return false;
+    }
+  }
+  return true;
+}
+
+void PathCairo::EnsureContainingContext(const Matrix& aTransform) const {
+  if (mContainingContext) {
+    if (mContainingTransform.ExactlyEquals(aTransform)) {
+      return;
+    }
+  } else {
+    mContainingContext = cairo_create(DrawTargetCairo::GetDummySurface());
+  }
+
+  mContainingTransform = aTransform;
+
+  cairo_matrix_t mat;
+  GfxMatrixToCairoMatrix(mContainingTransform, mat);
+  cairo_set_matrix(mContainingContext, &mat);
+
+  SetPathOnContext(mContainingContext);
+}
+
+void PathCairo::SetPathOnContext(cairo_t* aContext) const {
+  // Needs the correct fill rule set.
+  cairo_set_fill_rule(aContext, GfxFillRuleToCairoFillRule(mFillRule));
+
+  cairo_new_path(aContext);
+
+  if (!mPathData.empty()) {
+    cairo_path_t path;
+    path.data = const_cast<cairo_path_data_t*>(&mPathData.front());
+    path.num_data = mPathData.size();
+    path.status = CAIRO_STATUS_SUCCESS;
+    cairo_append_path(aContext, &path);
+  }
+}
+
+void PathCairo::AppendPathToBuilder(PathBuilderCairo* aBuilder,
+                                    const Matrix* aTransform) const {
+  if (aTransform) {
+    size_t i = 0;
+    while (i < mPathData.size()) {
+      uint32_t pointCount = mPathData[i].header.length - 1;
+      aBuilder->mPathData.push_back(mPathData[i]);
+      i++;
+      for (uint32_t c = 0; c < pointCount; c++) {
+        cairo_path_data_t data;
+        Point newPoint = aTransform->TransformPoint(
+            Point(mPathData[i].point.x, mPathData[i].point.y));
+        data.point.x = newPoint.x;
+        data.point.y = newPoint.y;
+        aBuilder->mPathData.push_back(data);
+        i++;
+      }
+    }
+  } else {
+    for (size_t i = 0; i < mPathData.size(); i++) {
+      aBuilder->mPathData.push_back(mPathData[i]);
+    }
+  }
+}
+
+}  // namespace gfx
+}  // namespace mozilla