gecko-dev/layout/base/ShapeUtils.cpp
Ting-Yu Lin 287eecf10f Bug 1326406 Part 2 - Extract the computation of ellipse radii as ComputeEllipseRadii(). r=dbaron
MozReview-Commit-ID: LPdvg66adHQ

--HG--
extra : rebase_source : 7dbd171a65d9ba057cce48057b82d3f8c143c590
2017-01-23 17:17:05 +08:00

109 lines
3.9 KiB
C++

/* -*- 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 "mozilla/ShapeUtils.h"
#include <cstdlib>
#include "nsCSSRendering.h"
#include "nsRuleNode.h"
#include "nsStyleCoord.h"
#include "nsStyleStruct.h"
#include "SVGContentUtils.h"
namespace mozilla {
nscoord
ShapeUtils::ComputeShapeRadius(const StyleShapeRadius aType,
const nscoord aCenter,
const nscoord aPosMin,
const nscoord aPosMax)
{
nscoord dist1 = std::abs(aPosMin - aCenter);
nscoord dist2 = std::abs(aPosMax - aCenter);
nscoord length = 0;
switch (aType) {
case StyleShapeRadius::FarthestSide:
length = dist1 > dist2 ? dist1 : dist2;
break;
case StyleShapeRadius::ClosestSide:
length = dist1 > dist2 ? dist2 : dist1;
break;
}
return length;
}
nsPoint
ShapeUtils::ComputeCircleOrEllipseCenter(StyleBasicShape* const aBasicShape,
const nsRect& aRefBox)
{
nsPoint topLeft, anchor;
nsSize size(aRefBox.Size());
nsImageRenderer::ComputeObjectAnchorPoint(aBasicShape->GetPosition(),
size, size,
&topLeft, &anchor);
return nsPoint(anchor.x + aRefBox.x, anchor.y + aRefBox.y);
}
nscoord
ShapeUtils::ComputeCircleRadius(StyleBasicShape* const aBasicShape,
const nsPoint& aCenter,
const nsRect& aRefBox)
{
const nsTArray<nsStyleCoord>& coords = aBasicShape->Coordinates();
MOZ_ASSERT(coords.Length() == 1, "wrong number of arguments");
nscoord r = 0;
if (coords[0].GetUnit() == eStyleUnit_Enumerated) {
const auto styleShapeRadius = coords[0].GetEnumValue<StyleShapeRadius>();
nscoord horizontal =
ComputeShapeRadius(styleShapeRadius, aCenter.x, aRefBox.x, aRefBox.XMost());
nscoord vertical =
ComputeShapeRadius(styleShapeRadius, aCenter.y, aRefBox.y, aRefBox.YMost());
r = styleShapeRadius == StyleShapeRadius::FarthestSide
? std::max(horizontal, vertical)
: std::min(horizontal, vertical);
} else {
// We resolve percent <shape-radius> value for circle() as defined here:
// https://drafts.csswg.org/css-shapes/#funcdef-circle
double referenceLength =
SVGContentUtils::ComputeNormalizedHypotenuse(aRefBox.width,
aRefBox.height);
r = nsRuleNode::ComputeCoordPercentCalc(coords[0],
NSToCoordRound(referenceLength));
}
return r;
}
nsSize
ShapeUtils::ComputeEllipseRadii(StyleBasicShape* const aBasicShape,
const nsPoint& aCenter,
const nsRect& aRefBox)
{
const nsTArray<nsStyleCoord>& coords = aBasicShape->Coordinates();
MOZ_ASSERT(coords.Length() == 2, "wrong number of arguments");
nsSize radii;
if (coords[0].GetUnit() == eStyleUnit_Enumerated) {
const StyleShapeRadius radiusX = coords[0].GetEnumValue<StyleShapeRadius>();
radii.width = ComputeShapeRadius(radiusX, aCenter.x, aRefBox.x,
aRefBox.XMost());
} else {
radii.width = nsRuleNode::ComputeCoordPercentCalc(coords[0], aRefBox.width);
}
if (coords[1].GetUnit() == eStyleUnit_Enumerated) {
const StyleShapeRadius radiusY = coords[1].GetEnumValue<StyleShapeRadius>();
radii.height = ComputeShapeRadius(radiusY, aCenter.y, aRefBox.y,
aRefBox.YMost());
} else {
radii.height = nsRuleNode::ComputeCoordPercentCalc(coords[1], aRefBox.height);
}
return radii;
}
} // namespace mozilla