The Tor Browser: comparison gfx/2d/PathHelpers.h

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+:55edfeb9724d
+/* -*- 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/. */
+#ifndef MOZILLA_GFX_PATHHELPERS_H_
+#define MOZILLA_GFX_PATHHELPERS_H_
+#include "2D.h"
+#include "mozilla/Constants.h"
+namespace mozilla {
+namespace gfx {
+template <typename T>
+void ArcToBezier(T* aSink, const Point &aOrigin, const Size &aRadius,
+float aStartAngle, float aEndAngle, bool aAntiClockwise)
+{
+Point startPoint(aOrigin.x + cos(aStartAngle) * aRadius.width,
+aOrigin.y + sin(aStartAngle) * aRadius.height);
+aSink->LineTo(startPoint);
+// Clockwise we always sweep from the smaller to the larger angle, ccw
+// it's vice versa.
+if (!aAntiClockwise && (aEndAngle < aStartAngle)) {
+Float correction = Float(ceil((aStartAngle - aEndAngle) / (2.0f * M_PI)));
+aEndAngle += float(correction * 2.0f * M_PI);
+} else if (aAntiClockwise && (aStartAngle < aEndAngle)) {
+Float correction = (Float)ceil((aEndAngle - aStartAngle) / (2.0f * M_PI));
+aStartAngle += float(correction * 2.0f * M_PI);
+}
+// Sweeping more than 2 * pi is a full circle.
+if (!aAntiClockwise && (aEndAngle - aStartAngle > 2 * M_PI)) {
+aEndAngle = float(aStartAngle + 2.0f * M_PI);
+} else if (aAntiClockwise && (aStartAngle - aEndAngle > 2.0f * M_PI)) {
+aEndAngle = float(aStartAngle - 2.0f * M_PI);
+}
+// Calculate the total arc we're going to sweep.
+Float arcSweepLeft = fabs(aEndAngle - aStartAngle);
+Float sweepDirection = aAntiClockwise ? -1.0f : 1.0f;
+Float currentStartAngle = aStartAngle;
+while (arcSweepLeft > 0) {
+// We guarantee here the current point is the start point of the next
+// curve segment.
+Float currentEndAngle;
+if (arcSweepLeft > M_PI / 2.0f) {
+currentEndAngle = Float(currentStartAngle + M_PI / 2.0f * sweepDirection);
+} else {
+currentEndAngle = currentStartAngle + arcSweepLeft * sweepDirection;
+}
+Point currentStartPoint(aOrigin.x + cos(currentStartAngle) * aRadius.width,
+aOrigin.y + sin(currentStartAngle) * aRadius.height);
+Point currentEndPoint(aOrigin.x + cos(currentEndAngle) * aRadius.width,
+aOrigin.y + sin(currentEndAngle) * aRadius.height);
+// Calculate kappa constant for partial curve. The sign of angle in the
+// tangent will actually ensure this is negative for a counter clockwise
+// sweep, so changing signs later isn't needed.
+Float kappaFactor = (4.0f / 3.0f) * tan((currentEndAngle - currentStartAngle) / 4.0f);
+Float kappaX = kappaFactor * aRadius.width;
+Float kappaY = kappaFactor * aRadius.height;
+Point tangentStart(-sin(currentStartAngle), cos(currentStartAngle));
+Point cp1 = currentStartPoint;
+cp1 += Point(tangentStart.x * kappaX, tangentStart.y * kappaY);
+Point revTangentEnd(sin(currentEndAngle), -cos(currentEndAngle));
+Point cp2 = currentEndPoint;
+cp2 += Point(revTangentEnd.x * kappaX, revTangentEnd.y * kappaY);
+aSink->BezierTo(cp1, cp2, currentEndPoint);
+arcSweepLeft -= Float(M_PI / 2.0f);
+currentStartAngle = currentEndAngle;
+}
+}
+/**
+* Appends a path represending a rounded rectangle to the path being built by
+* aPathBuilder.
+*
+* aRect           The rectangle to append.
+* aCornerRadii    Contains the radii of the top-left, top-right, bottom-right
+*                 and bottom-left corners, in that order.
+* aDrawClockwise  If set to true, the path will start at the left of the top
+*                 left edge and draw clockwise. If set to false the path will
+*                 start at the right of the top left edge and draw counter-
+*                 clockwise.
+*/
+GFX2D_API void AppendRoundedRectToPath(PathBuilder* aPathBuilder,
+const Rect& aRect,
+const Size(& aCornerRadii)[4],
+bool aDrawClockwise = true);
+/**
+* Appends a path represending an ellipse to the path being built by
+* aPathBuilder.
+*
+* The ellipse extends aDimensions.width / 2.0 in the horizontal direction
+* from aCenter, and aDimensions.height / 2.0 in the vertical direction.
+*/
+GFX2D_API void AppendEllipseToPath(PathBuilder* aPathBuilder,
+const Point& aCenter,
+const Size& aDimensions);
+static inline bool
+UserToDevicePixelSnapped(Rect& aRect, const Matrix& aTransform)
+{
+Point p1 = aTransform * aRect.TopLeft();
+Point p2 = aTransform * aRect.TopRight();
+Point p3 = aTransform * aRect.BottomRight();
+// Check that the rectangle is axis-aligned. For an axis-aligned rectangle,
+// two opposite corners define the entire rectangle. So check if
+// the axis-aligned rectangle with opposite corners p1 and p3
+// define an axis-aligned rectangle whose other corners are p2 and p4.
+// We actually only need to check one of p2 and p4, since an affine
+// transform maps parallelograms to parallelograms.
+if (p2 == Point(p1.x, p3.y) || p2 == Point(p3.x, p1.y)) {
+p1.Round();
+p3.Round();
+aRect.MoveTo(Point(std::min(p1.x, p3.x), std::min(p1.y, p3.y)));
+aRect.SizeTo(Size(std::max(p1.x, p3.x) - aRect.X(),
+std::max(p1.y, p3.y) - aRect.Y()));
+return true;
+}
+return false;
+}
+} // namespace gfx
+} // namespace mozilla
+#endif /* MOZILLA_GFX_PATHHELPERS_H_ */

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comparison: gfx/2d/PathHelpers.h

gfx/2d/PathHelpers.h