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b1ca51fe1e
And move the useful bits of it somewhere else (ServoStyleConstInlines.h for the inline function definitions, and nsFrame.cpp for the static assertions). Differential Revision: https://phabricator.services.mozilla.com/D36120
150 lines
5.5 KiB
C++
150 lines
5.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ShapeUtils.h"
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#include <cstdlib>
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#include "nsCSSRendering.h"
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#include "nsMargin.h"
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#include "nsStyleStruct.h"
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#include "SVGContentUtils.h"
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namespace mozilla {
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nscoord ShapeUtils::ComputeShapeRadius(const StyleShapeRadius& aType,
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const nscoord aCenter,
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const nscoord aPosMin,
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const nscoord aPosMax) {
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MOZ_ASSERT(aType.IsFarthestSide() || aType.IsClosestSide());
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nscoord dist1 = std::abs(aPosMin - aCenter);
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nscoord dist2 = std::abs(aPosMax - aCenter);
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nscoord length = 0;
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if (aType.IsFarthestSide()) {
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length = dist1 > dist2 ? dist1 : dist2;
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} else {
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length = dist1 > dist2 ? dist2 : dist1;
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}
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return length;
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}
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nsPoint ShapeUtils::ComputeCircleOrEllipseCenter(
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const StyleBasicShape& aBasicShape, const nsRect& aRefBox) {
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MOZ_ASSERT(aBasicShape.IsCircle() || aBasicShape.IsEllipse(),
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"The basic shape must be circle() or ellipse!");
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const auto& position = aBasicShape.IsCircle()
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? aBasicShape.AsCircle().position
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: aBasicShape.AsEllipse().position;
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nsPoint topLeft, anchor;
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nsSize size(aRefBox.Size());
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nsImageRenderer::ComputeObjectAnchorPoint(position, size, size, &topLeft,
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&anchor);
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return anchor + aRefBox.TopLeft();
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}
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nscoord ShapeUtils::ComputeCircleRadius(const StyleBasicShape& aBasicShape,
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const nsPoint& aCenter,
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const nsRect& aRefBox) {
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MOZ_ASSERT(aBasicShape.IsCircle(), "The basic shape must be circle()!");
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const auto& radius = aBasicShape.AsCircle().radius;
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if (radius.IsLength()) {
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return radius.AsLength().Resolve([&] {
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// We resolve percent <shape-radius> value for circle() as defined here:
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// https://drafts.csswg.org/css-shapes/#funcdef-circle
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double referenceLength = SVGContentUtils::ComputeNormalizedHypotenuse(
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aRefBox.width, aRefBox.height);
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return NSToCoordRound(referenceLength);
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});
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}
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nscoord horizontal =
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ComputeShapeRadius(radius, aCenter.x, aRefBox.x, aRefBox.XMost());
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nscoord vertical =
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ComputeShapeRadius(radius, aCenter.y, aRefBox.y, aRefBox.YMost());
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return radius.IsFarthestSide() ? std::max(horizontal, vertical)
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: std::min(horizontal, vertical);
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}
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nsSize ShapeUtils::ComputeEllipseRadii(const StyleBasicShape& aBasicShape,
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const nsPoint& aCenter,
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const nsRect& aRefBox) {
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MOZ_ASSERT(aBasicShape.IsEllipse(), "The basic shape must be ellipse()!");
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const auto& ellipse = aBasicShape.AsEllipse();
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nsSize radii;
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if (ellipse.semiaxis_x.IsLength()) {
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radii.width = ellipse.semiaxis_x.AsLength().Resolve(aRefBox.width);
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} else {
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radii.width = ComputeShapeRadius(ellipse.semiaxis_x, aCenter.x, aRefBox.x,
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aRefBox.XMost());
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}
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if (ellipse.semiaxis_y.IsLength()) {
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radii.height = ellipse.semiaxis_y.AsLength().Resolve(aRefBox.height);
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} else {
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radii.height = ComputeShapeRadius(ellipse.semiaxis_y, aCenter.y, aRefBox.y,
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aRefBox.YMost());
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}
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return radii;
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}
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/* static */
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nsRect ShapeUtils::ComputeInsetRect(const StyleBasicShape& aBasicShape,
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const nsRect& aRefBox) {
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MOZ_ASSERT(aBasicShape.IsInset(), "The basic shape must be inset()!");
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const auto& rect = aBasicShape.AsInset().rect;
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nsMargin inset(
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rect._0.Resolve(aRefBox.Height()), rect._1.Resolve(aRefBox.Width()),
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rect._2.Resolve(aRefBox.Height()), rect._3.Resolve(aRefBox.Width()));
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nscoord x = aRefBox.X() + inset.left;
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nscoord width = aRefBox.Width() - inset.LeftRight();
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nscoord y = aRefBox.Y() + inset.top;
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nscoord height = aRefBox.Height() - inset.TopBottom();
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// Invert left and right, if necessary.
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if (width < 0) {
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width *= -1;
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x -= width;
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}
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// Invert top and bottom, if necessary.
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if (height < 0) {
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height *= -1;
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y -= height;
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}
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return nsRect(x, y, width, height);
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}
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/* static */
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bool ShapeUtils::ComputeInsetRadii(const StyleBasicShape& aBasicShape,
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const nsRect& aInsetRect,
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const nsRect& aRefBox, nscoord aRadii[8]) {
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const auto& radius = aBasicShape.AsInset().round;
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return nsIFrame::ComputeBorderRadii(radius, aInsetRect.Size(), aRefBox.Size(),
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Sides(), aRadii);
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}
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/* static */
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nsTArray<nsPoint> ShapeUtils::ComputePolygonVertices(
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const StyleBasicShape& aBasicShape, const nsRect& aRefBox) {
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MOZ_ASSERT(aBasicShape.IsPolygon(), "The basic shape must be polygon()!");
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auto coords = aBasicShape.AsPolygon().coordinates.AsSpan();
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nsTArray<nsPoint> vertices(coords.Length());
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for (const StylePolygonCoord<LengthPercentage>& point : coords) {
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vertices.AppendElement(nsPoint(point._0.Resolve(aRefBox.width),
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point._1.Resolve(aRefBox.height)) +
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aRefBox.TopLeft());
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}
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return vertices;
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}
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} // namespace mozilla
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