Add m-esr52 at 52.6.0

1 files changed, 438 insertions, 0 deletions

diff --git a/layout/base/DottedCornerFinder.h b/layout/base/DottedCornerFinder.h
new file mode 100644
index 0000000000..79eba5af8b
--- /dev/null
+++ b/layout/base/DottedCornerFinder.h
@@ -0,0 +1,438 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef mozilla_DottedCornerFinder_h_
+#define mozilla_DottedCornerFinder_h_
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/BezierUtils.h"
+#include "gfxRect.h"
+
+namespace mozilla {
+
+// Calculate C_i and r_i for each filled/unfilled circles in dotted corner.
+// Returns circle with C_{2j} and r_{2j} where 0 < 2j < n.
+//
+//                            ____-----------+
+//                      __----  *****     ###|
+//                __----      *********  ####|
+//           __---  #####    ***********#####|
+//        _--     #########  *****+*****#####+ C_0
+//      _-       ########### *** C_1****#####|
+//     /         #####+#####  *********  ####|
+//    /       .  ### C_2 ###    *****     ###|
+//   |            #########       ____-------+
+//   |     .        #####____-----
+//  |              __----
+//  |    .       /
+// |           /
+// |  *****   |
+// | ******* |
+// |*********|
+// |****+****|
+// | C_{n-1} |
+// | ******* |
+// |  *****  |
+// |  #####  |
+// | ####### |
+// |#########|
+// +----+----+
+//     C_n
+
+class DottedCornerFinder
+{
+  typedef mozilla::gfx::Bezier Bezier;
+  typedef mozilla::gfx::Float Float;
+  typedef mozilla::gfx::Point Point;
+  typedef mozilla::gfx::Size Size;
+
+public:
+  struct Result
+  {
+    // Center point of dot and its radius.
+    Point C;
+    Float r;
+
+    Result(const Point& aC, Float aR)
+     : C(aC), r(aR)
+    {
+      MOZ_ASSERT(aR >= 0);
+    }
+  };
+
+  //                        aBorderRadiusX
+  //                       aCornerDim.width
+  //                     |<----------------->|
+  //                     |                   | v
+  //                   --+-------------___---+--
+  //                   ^ |         __--      | |
+  //                   | |       _-          | | aR0
+  //                   | |     /         aC0 +--
+  //                   | |   /               | ^
+  //                   | |  |                |
+  //  aBorderRadiusY   | | |             __--+
+  // aCornerDim.height | ||            _-
+  //                   | ||           /
+  //                   | |           /
+  //                   | |          |
+  //                   | |          |
+  //                   | |         |
+  //                   | |         |
+  //                   v |    aCn  |
+  //                   --+----+----+
+  //                     |    |
+  //                     |<-->|
+  //                      aRn
+  //
+  // aCornerDim and (aBorderRadiusX, aBorderRadiusY) can be different when
+  // aBorderRadiusX is smaller than aRn*2 or
+  // aBorderRadiusY is smaller than aR0*2.
+  //
+  //                                        aCornerDim.width
+  //                                      |<----------------->|
+  //                                      |                   |
+  //                                      | aBorderRadiusX    |
+  //                                      |<--------->|       |
+  //                                      |           |       |
+  //                   -------------------+-------__--+-------+--
+  //                   ^                ^ |     _-            | ^
+  //                   |                | |   /               | |
+  //                   |                | |  /                | |
+  //                   | aBorderRadiusY | | |                 | | aR0
+  //                   |                | ||                  | |
+  //                   |                | |                   | |
+  // aCornerDim.height |                v |                   | v
+  //                   |                --+               aC0 +--
+  //                   |                  |                   |
+  //                   |                  |                   |
+  //                   |                  |                   |
+  //                   |                  |                   |
+  //                   |                  |                   |
+  //                   v                  |        aCn        |
+  //                   -------------------+---------+---------+
+  //                                      |         |
+  //                                      |<------->|
+  //                                          aRn
+  DottedCornerFinder(const Bezier& aOuterBezier, const Bezier& aInnerBezier,
+                     mozilla::css::Corner aCorner,
+                     Float aBorderRadiusX, Float aBorderRadiusY,
+                     const Point& aC0, Float aR0, const Point& aCn, Float aRn,
+                     const Size& aCornerDim);
+
+  bool HasMore(void) const;
+  Result Next(void);
+
+private:
+  static const size_t MAX_LOOP = 32;
+
+  // Bezier control points for the outer curve, the inner curve, and a curve
+  // that center points of circles are on (center curve).
+  //
+  //               ___---+ outer curve
+  //           __--      |
+  //         _-          |
+  //       /        __---+ center curve
+  //     /      __--     |
+  //    |     /          |
+  //   |    /        __--+ inner curve
+  //  |    |       _-
+  //  |    |      /
+  // |     |     /
+  // |    |     |
+  // |    |     |
+  // |    |    |
+  // |    |    |
+  // |    |    |
+  // +----+----+
+  Bezier mOuterBezier;
+  Bezier mInnerBezier;
+  Bezier mCenterBezier;
+
+  mozilla::css::Corner mCorner;
+
+  // Sign of the normal vector used in radius calculation, flipped depends on
+  // corner and start and end radii.
+  Float mNormalSign;
+
+  // Center points and raii for start and end circles, mR0 >= mRn.
+  // mMaxR = max(mR0, mRn)
+  //
+  //                           v
+  //               ___---+------
+  //           __--     #|#    | mRn
+  //         _-        ##|##   |
+  //       /           ##+## ---
+  //     /              mCn    ^
+  //    |               #|#
+  //   |             __--+
+  //  |            _-
+  //  |           /
+  // |           /
+  // |          |
+  // |          |
+  // |  #####  |
+  // | ####### |
+  // |#########|
+  // +----+----+
+  // |## mC0 ##|
+  // | ####### |
+  // |  #####  |
+  // |    |
+  // |<-->|
+  //
+  //  mR0
+  //
+  Point mC0;
+  Point mCn;
+  Float mR0;
+  Float mRn;
+  Float mMaxR;
+
+  // Parameters for the center curve with perfect circle and the inner curve.
+  // The center curve doesn't necessarily share the origin with others.
+  //
+  //               ___---+
+  //           __--      |
+  //         _-          |
+  //       /        __-+ |
+  //     /      __--     |
+  //    |     /          |
+  //   |    /        __--+--
+  //  |    |       _-    | ^
+  //  |    |      /      | |
+  // |     |     /       | |
+  // |    |     |        | |
+  // |    |     |        | | mInnerHeight
+  // |    |    |         | |
+  // |    +    |         | |
+  // |         |         | v
+  // +---------+---------+
+  //           |         | mInnerCurveOrigin
+  //           |<------->|
+  //           mInnerWidth
+  //
+  //               ___---+
+  //           __--
+  //         _-
+  //       /        __-+
+  //     /      __--   |
+  //    |     /        |
+  //   |    /        __--+
+  //  |    |       _-  |
+  //  |    |      /    |
+  // |     |     /     |
+  // |    |     |      |
+  // |    |     |      |
+  // |    |    |       |
+  // |    +--- | ------+
+  // |    |    |       | mCenterCurveOrigin
+  // +    |    +       |
+  //      |            |
+  //      |            |
+  //      |            |
+  //      |            |
+  //      |<---------->|
+  //       mCenterCurveR
+  //
+  Point mCenterCurveOrigin;
+  Float mCenterCurveR;
+  Point mInnerCurveOrigin;
+  Float mInnerWidth;
+  Float mInnerHeight;
+
+  Point mLastC;
+  Float mLastR;
+  Float mLastT;
+
+  // Overlap between two circles.
+  // It uses arc length on PERFECT, SINGLE_CURVE_AND_RADIUS, and SINGLE_CURVE,
+  // and direct distance on OTHER.
+  Float mBestOverlap;
+
+  // If one of border-widths is 0, do not calculate overlap, and draw circles
+  // until it reaches the other side or exceeds mMaxCount.
+  bool mHasZeroBorderWidth;
+  bool mHasMore;
+
+  // The maximum number of filled/unfilled circles.
+  size_t mMaxCount;
+
+  enum {
+    //                      radius.width
+    //                 |<----------------->|
+    //                 |                   |
+    //               --+-------------___---+----
+    //               ^ |         __--     #|#  ^
+    //               | |       _-        ##|## |
+    //               | |     /           ##+## | top-width
+    //               | |   /             ##|## |
+    //               | |  |               #|#  v
+    //               | | |             __--+----
+    // radius.height | ||            _-
+    //               | ||           /
+    //               | |           /
+    //               | |          |
+    //               | |          |
+    //               | |  #####  |
+    //               | | ####### |
+    //               v |#########|
+    //               --+----+----+
+    //                 |#########|
+    //                 | ####### |
+    //                 |  #####  |
+    //                 |         |
+    //                 |<------->|
+    //                  left-width
+
+    // * top-width == left-width
+    // * radius.width == radius.height
+    // * top-width < radius.width * 2
+    //
+    // All circles has same radii and are on single perfect circle's arc.
+    // Overlap is known.
+    //
+    // Split the perfect circle's arc into 2n segments, each segment's length is
+    // top-width * (1 - overlap).  Place each circle's center point C_i on each
+    // end of the segment, each circle's radius r_i is top-width / 2
+    //
+    //                       #####
+    //                      #######
+    // perfect             #########
+    // circle's          ___---+####
+    // arc     ##### __--  ## C_0 ##
+    //   |    #####_-       ###|###
+    //   |   ####+####       ##|##
+    //   |   ##/C_i ##         |
+    //   |    |######          |
+    //   |   | #####           |
+    //   +->|                  |
+    //     |                   |
+    //   ##|##                 |
+    //  ###|###                |
+    // ####|####               |
+    // ####+-------------------+
+    // ## C_n ##
+    //  #######
+    //   #####
+    PERFECT,
+
+    // * top-width == left-width
+    // * 0.5 < radius.width / radius.height < 2.0
+    // * top-width < min(radius.width, radius.height) * 2
+    //
+    // All circles has same radii and are on single elliptic arc.
+    // Overlap is known.
+    //
+    // Split the elliptic arc into 2n segments, each segment's length is
+    // top-width * (1 - overlap).  Place each circle's center point C_i on each
+    // end of the segment, each circle's radius r_i is top-width / 2
+    //
+    //                            #####
+    //                           #######
+    //             #####        #########
+    //            #######   ____----+####
+    // elliptic  ######__---    ## C_0 ##
+    // arc       ##__+-###       ###|###
+    //   |      / # C_i #         ##|##
+    //   +--> /    #####            |
+    //       |                      |
+    //   ###|#                      |
+    //  ###|###                     |
+    // ####|####                    |
+    // ####+------------------------+
+    // ## C_n ##
+    //  #######
+    //   #####
+    SINGLE_CURVE_AND_RADIUS,
+
+    // * top-width != left-width
+    // * 0 < min(top-width, left-width)
+    // * 0.5 < radius.width / radius.height < 2.0
+    // * max(top-width, left-width) < min(radius.width, radius.height) * 2
+    //
+    // All circles are on single elliptic arc.
+    // Overlap is unknown.
+    //
+    // Place each circle's center point C_i on elliptic arc, each circle's
+    // radius r_i is the distance between the center point and the inner curve.
+    // The arc segment's length between C_i and C_{i-1} is
+    // (r_i + r_{i-1}) * (1 - overlap).
+    //
+    //  outer curve
+    //           /
+    //          /
+    //         /         / center curve
+    //        / ####### /
+    //       /##       /#
+    //      +#        /  #
+    //     /#        /    #
+    //    / #   C_i /     #
+    //   /  #      +      #  /
+    //  /   #     /  \    # / inner curve
+    //      #    /     \  #/
+    //       #  /   r_i  \+
+    //        #/       ##/
+    //        / ####### /
+    //                 /
+    SINGLE_CURVE,
+
+    // Other cases.
+    // Circles are not on single elliptic arc.
+    // Overlap are unknown.
+    //
+    // Place tangent point innerTangent on the inner curve and find circle's
+    // center point C_i and radius r_i where the circle is also tangent to the
+    // outer curve.
+    // Distance between C_i and C_{i-1} is (r_i + r_{i-1}) * (1 - overlap).
+    //
+    //  outer curve
+    //           /
+    //          /
+    //         /
+    //        / #######
+    //       /##       ##
+    //      +#           #
+    //     /# \           #
+    //    / #    \        #
+    //   /  #      +      #  /
+    //  /   #   C_i  \    # / inner curve
+    //      #          \  #/
+    //       #      r_i  \+
+    //        ##       ##/ innerTangent
+    //          ####### /
+    //                 /
+    OTHER
+  } mType;
+
+  size_t mI;
+  size_t mCount;
+
+  // Determine mType from parameters.
+  void DetermineType(Float aBorderRadiusX, Float aBorderRadiusY);
+
+  // Reset calculation.
+  void Reset(void);
+
+  // Find radius for the given tangent point on the inner curve such that the
+  // circle is also tangent to the outer curve.
+  void FindPointAndRadius(Point& C, Float& r, const Point& innerTangent,
+                          const Point& normal, Float t);
+
+  // Find next dot.
+  Float FindNext(Float overlap);
+
+  // Find mBestOverlap for parameters.
+  void FindBestOverlap(Float aMinR,
+                       Float aMinBorderRadius, Float aMaxBorderRadius);
+
+  // Fill corner with dots with given overlap, and return the number of dots
+  // and last two dots's overlap.
+  bool GetCountAndLastOverlap(Float aOverlap,
+                              size_t* aCount, Float* aActualOverlap);
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_DottedCornerFinder_h_ */