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| 1 /* | |
| 2 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above | |
| 9 * copyright notice, this list of conditions and the following | |
| 10 * disclaimer. | |
| 11 * 2. Redistributions in binary form must reproduce the above | |
| 12 * copyright notice, this list of conditions and the following | |
| 13 * disclaimer in the documentation and/or other materials | |
| 14 * provided with the distribution. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
| 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
| 20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
| 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
| 27 * OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 28 */ | |
| 29 | |
| 30 #include "config.h" | |
| 31 #include "core/rendering/shapes/RectangleShape.h" | |
| 32 | |
| 33 #include "wtf/MathExtras.h" | |
| 34 | |
| 35 namespace blink { | |
| 36 | |
| 37 static inline float ellipseXIntercept(float y, float rx, float ry) | |
| 38 { | |
| 39 ASSERT(ry > 0); | |
| 40 return rx * sqrt(1 - (y * y) / (ry * ry)); | |
| 41 } | |
| 42 | |
| 43 FloatRect RectangleShape::shapeMarginBounds() const | |
| 44 { | |
| 45 ASSERT(shapeMargin() >= 0); | |
| 46 if (!shapeMargin()) | |
| 47 return m_bounds; | |
| 48 | |
| 49 float boundsX = x() - shapeMargin(); | |
| 50 float boundsY = y() - shapeMargin(); | |
| 51 float boundsWidth = width() + shapeMargin() * 2; | |
| 52 float boundsHeight = height() + shapeMargin() * 2; | |
| 53 return FloatRect(boundsX, boundsY, boundsWidth, boundsHeight); | |
| 54 } | |
| 55 | |
| 56 LineSegment RectangleShape::getExcludedInterval(LayoutUnit logicalTop, LayoutUni
t logicalHeight) const | |
| 57 { | |
| 58 const FloatRect& bounds = shapeMarginBounds(); | |
| 59 if (bounds.isEmpty()) | |
| 60 return LineSegment(); | |
| 61 | |
| 62 float y1 = logicalTop.toFloat(); | |
| 63 float y2 = (logicalTop + logicalHeight).toFloat(); | |
| 64 | |
| 65 if (y2 < bounds.y() || y1 >= bounds.maxY()) | |
| 66 return LineSegment(); | |
| 67 | |
| 68 float x1 = bounds.x(); | |
| 69 float x2 = bounds.maxX(); | |
| 70 | |
| 71 float marginRadiusX = rx() + shapeMargin(); | |
| 72 float marginRadiusY = ry() + shapeMargin(); | |
| 73 | |
| 74 if (marginRadiusY > 0) { | |
| 75 if (y2 < bounds.y() + marginRadiusY) { | |
| 76 float yi = y2 - bounds.y() - marginRadiusY; | |
| 77 float xi = ellipseXIntercept(yi, marginRadiusX, marginRadiusY); | |
| 78 x1 = bounds.x() + marginRadiusX - xi; | |
| 79 x2 = bounds.maxX() - marginRadiusX + xi; | |
| 80 } else if (y1 > bounds.maxY() - marginRadiusY) { | |
| 81 float yi = y1 - (bounds.maxY() - marginRadiusY); | |
| 82 float xi = ellipseXIntercept(yi, marginRadiusX, marginRadiusY); | |
| 83 x1 = bounds.x() + marginRadiusX - xi; | |
| 84 x2 = bounds.maxX() - marginRadiusX + xi; | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 return LineSegment(x1, x2); | |
| 89 } | |
| 90 | |
| 91 void RectangleShape::buildDisplayPaths(DisplayPaths& paths) const | |
| 92 { | |
| 93 paths.shape.addRoundedRect(m_bounds, m_radii); | |
| 94 if (shapeMargin()) | |
| 95 paths.marginShape.addRoundedRect(shapeMarginBounds(), FloatSize(m_radii.
width() + shapeMargin(), m_radii.height() + shapeMargin())); | |
| 96 } | |
| 97 | |
| 98 } // namespace blink | |
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