mirror of
https://github.com/mozilla/gecko-dev.git
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795 lines
32 KiB
C++
795 lines
32 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/MotionPathUtils.h"
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#include "gfxPlatform.h"
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#include "mozilla/dom/SVGGeometryElement.h"
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#include "mozilla/dom/SVGPathData.h"
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#include "mozilla/dom/SVGViewportElement.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/Matrix.h"
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#include "mozilla/layers/LayersMessages.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/SVGObserverUtils.h"
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#include "mozilla/ShapeUtils.h"
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#include "nsIFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsStyleTransformMatrix.h"
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#include <math.h>
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namespace mozilla {
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using nsStyleTransformMatrix::TransformReferenceBox;
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/* static */
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CSSPoint MotionPathUtils::ComputeAnchorPointAdjustment(const nsIFrame& aFrame) {
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if (!aFrame.HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
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return {};
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}
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auto transformBox = aFrame.StyleDisplay()->mTransformBox;
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if (transformBox == StyleTransformBox::ViewBox ||
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transformBox == StyleTransformBox::BorderBox) {
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return {};
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}
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if (aFrame.IsSVGContainerFrame()) {
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nsRect boxRect = nsLayoutUtils::ComputeSVGReferenceRect(
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const_cast<nsIFrame*>(&aFrame), StyleGeometryBox::FillBox);
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return CSSPoint::FromAppUnits(boxRect.TopLeft());
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}
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return CSSPoint::FromAppUnits(aFrame.GetPosition());
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}
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// Convert the StyleCoordBox into the StyleGeometryBox in CSS layout.
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// https://drafts.csswg.org/css-box-4/#keywords
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static StyleGeometryBox CoordBoxToGeometryBoxInCSSLayout(
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StyleCoordBox aCoordBox) {
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switch (aCoordBox) {
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case StyleCoordBox::ContentBox:
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return StyleGeometryBox::ContentBox;
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case StyleCoordBox::PaddingBox:
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return StyleGeometryBox::PaddingBox;
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case StyleCoordBox::BorderBox:
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return StyleGeometryBox::BorderBox;
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case StyleCoordBox::FillBox:
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return StyleGeometryBox::ContentBox;
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case StyleCoordBox::StrokeBox:
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case StyleCoordBox::ViewBox:
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return StyleGeometryBox::BorderBox;
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}
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MOZ_ASSERT_UNREACHABLE("Unknown coord-box type");
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return StyleGeometryBox::BorderBox;
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}
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/* static */
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const nsIFrame* MotionPathUtils::GetOffsetPathReferenceBox(
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const nsIFrame* aFrame, nsRect& aOutputRect) {
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const StyleOffsetPath& offsetPath = aFrame->StyleDisplay()->mOffsetPath;
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if (offsetPath.IsNone()) {
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return nullptr;
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}
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if (aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
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MOZ_ASSERT(aFrame->GetContent()->IsSVGElement());
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auto* viewportElement =
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dom::SVGElement::FromNode(aFrame->GetContent())->GetCtx();
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aOutputRect = nsLayoutUtils::ComputeSVGOriginBox(viewportElement);
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return viewportElement ? viewportElement->GetPrimaryFrame() : nullptr;
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}
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const nsIFrame* containingBlock = aFrame->GetContainingBlock();
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const StyleCoordBox coordBox = offsetPath.IsCoordBox()
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? offsetPath.AsCoordBox()
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: offsetPath.AsOffsetPath().coord_box;
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aOutputRect = nsLayoutUtils::ComputeHTMLReferenceRect(
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containingBlock, CoordBoxToGeometryBoxInCSSLayout(coordBox));
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return containingBlock;
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}
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/* static */
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CSSCoord MotionPathUtils::GetRayContainReferenceSize(nsIFrame* aFrame) {
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// We use the border-box size to calculate the reduced path length when using
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// "contain" keyword.
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// https://drafts.fxtf.org/motion-1/#valdef-ray-contain
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//
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// Note: Per the spec, border-box is treated as stroke-box in the SVG context,
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// https://drafts.csswg.org/css-box-4/#valdef-box-border-box
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// To calculate stroke bounds for an element with `non-scaling-stroke` we
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// need to resolve its transform to its outer-svg, but to resolve that
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// transform when it has `transform-box:stroke-box` (or `border-box`)
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// may require its stroke bounds. There's no ideal way to break this
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// cyclical dependency, but we break it by using the FillBox.
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// https://github.com/w3c/csswg-drafts/issues/9640
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const auto size = CSSSize::FromAppUnits(
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(aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)
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? nsLayoutUtils::ComputeSVGReferenceRect(
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aFrame,
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aFrame->StyleSVGReset()->HasNonScalingStroke()
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? StyleGeometryBox::FillBox
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: StyleGeometryBox::StrokeBox,
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nsLayoutUtils::MayHaveNonScalingStrokeCyclicDependency::Yes)
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: nsLayoutUtils::ComputeHTMLReferenceRect(
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aFrame, StyleGeometryBox::BorderBox))
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.Size());
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return std::max(size.width, size.height);
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}
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/* static */
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nsTArray<nscoord> MotionPathUtils::ComputeBorderRadii(
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const StyleBorderRadius& aBorderRadius, const nsRect& aCoordBox) {
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const nsRect insetRect = ShapeUtils::ComputeInsetRect(
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StyleRect<LengthPercentage>::WithAllSides(LengthPercentage::Zero()),
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aCoordBox);
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nsTArray<nscoord> result(8);
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result.SetLength(8);
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if (!ShapeUtils::ComputeRectRadii(aBorderRadius, aCoordBox, insetRect,
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result.Elements())) {
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result.Clear();
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}
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return result;
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}
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// The distance is measured between the origin and the intersection of the ray
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// with the reference box of the containing block.
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// Note: |aOrigin| and |aContaingBlock| should be in the same coordinate system
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// (i.e. the nsIFrame::mRect of the containing block).
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// https://drafts.fxtf.org/motion-1/#size-sides
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static CSSCoord ComputeSides(const CSSPoint& aOrigin,
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const CSSRect& aContainingBlock,
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const StyleAngle& aAngle) {
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const CSSPoint& topLeft = aContainingBlock.TopLeft();
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// Given an acute angle |theta| (i.e. |t|) of a right-angled triangle, the
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// hypotenuse |h| is the side that connects the two acute angles. The side
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// |b| adjacent to |theta| is the side of the triangle that connects |theta|
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// to the right angle.
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//
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// e.g. if the angle |t| is 0 ~ 90 degrees, and b * tan(theta) <= b',
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// h = b / cos(t):
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// b*tan(t)
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// (topLeft) #--------*-----*--# (aContainingBlock.XMost(), topLeft.y)
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// | | / |
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// | | / |
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// | b h |
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// | |t/ |
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// | |/ |
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// (aOrigin) *---b'---* (aContainingBlock.XMost(), aOrigin.y)
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// | | |
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// | | |
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// | | |
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// | | |
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// | | |
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// #-----------------# (aContainingBlock.XMost(),
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// (topLeft.x, aContainingBlock.YMost())
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// aContainingBlock.YMost())
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const double theta = aAngle.ToRadians();
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double sint = std::sin(theta);
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double cost = std::cos(theta);
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const double b = cost >= 0 ? aOrigin.y.value - topLeft.y
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: aContainingBlock.YMost() - aOrigin.y.value;
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const double bPrime = sint >= 0 ? aContainingBlock.XMost() - aOrigin.x.value
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: aOrigin.x.value - topLeft.x;
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sint = std::fabs(sint);
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cost = std::fabs(cost);
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// The trigonometric formula here doesn't work well if |theta| is 0deg or
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// 90deg, so we handle these edge cases first.
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if (sint < std::numeric_limits<double>::epsilon()) {
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// For 0deg (or 180deg), we use |b| directly.
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return static_cast<float>(b);
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}
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if (cost < std::numeric_limits<double>::epsilon()) {
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// For 90deg (or 270deg), we use |bPrime| directly. This can also avoid 0/0
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// if both |b| and |cost| are 0.0. (i.e. b / cost).
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return static_cast<float>(bPrime);
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}
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// Note: The following formula works well only when 0 < theta < 90deg. So we
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// handle 0deg and 90deg above first.
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//
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// If |b * tan(theta)| is larger than |bPrime|, the intersection is
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// on the other side, and |b'| is the opposite side of angle |theta| in this
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// case.
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//
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// e.g. If b * tan(theta) > b', h = b' / sin(theta):
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// *----*
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// | |
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// | /|
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// b /t|
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// |t/ |
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// |/ |
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// *-b'-*
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if (b * sint > bPrime * cost) {
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return bPrime / sint;
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}
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return b / cost;
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}
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// Compute the position of "at <position>" together with offset starting
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// position (i.e. offset-position).
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static nsPoint ComputePosition(const StylePositionOrAuto& aAtPosition,
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const StyleOffsetPosition& aOffsetPosition,
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const nsRect& aCoordBox,
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const nsPoint& aCurrentCoord) {
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if (aAtPosition.IsPosition()) {
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// Resolve this by using the <position> to position a 0x0 object area within
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// the box’s containing block.
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return ShapeUtils::ComputePosition(aAtPosition.AsPosition(), aCoordBox);
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}
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MOZ_ASSERT(aAtPosition.IsAuto(), "\"at <position>\" should be omitted");
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// Use the offset starting position of the element, given by offset-position.
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// https://drafts.fxtf.org/motion-1/#valdef-ray-at-position
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if (aOffsetPosition.IsPosition()) {
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return ShapeUtils::ComputePosition(aOffsetPosition.AsPosition(), aCoordBox);
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}
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if (aOffsetPosition.IsNormal()) {
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// If the element doesn’t have an offset starting position either, it
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// behaves as at center.
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const StylePosition& center = StylePosition::FromPercentage(0.5);
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return ShapeUtils::ComputePosition(center, aCoordBox);
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}
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MOZ_ASSERT(aOffsetPosition.IsAuto());
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return aCurrentCoord;
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}
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static CSSCoord ComputeRayPathLength(const StyleRaySize aRaySizeType,
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const StyleAngle& aAngle,
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const CSSPoint& aOrigin,
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const CSSRect& aContainingBlock) {
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if (aRaySizeType == StyleRaySize::Sides) {
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// If the initial position is not within the box, the distance is 0.
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//
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// Note: If the origin is at XMost() (and/or YMost()), we should consider it
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// to be inside containing block (because we expect 100% x (or y) coordinate
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// is still to be considered inside the containing block.
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if (!aContainingBlock.ContainsInclusively(aOrigin)) {
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return 0.0;
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}
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return ComputeSides(aOrigin, aContainingBlock, aAngle);
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}
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// left: the length between the origin and the left side.
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// right: the length between the origin and the right side.
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// top: the length between the origin and the top side.
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// bottom: the lenght between the origin and the bottom side.
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const CSSPoint& topLeft = aContainingBlock.TopLeft();
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const CSSCoord left = std::abs(aOrigin.x - topLeft.x);
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const CSSCoord right = std::abs(aContainingBlock.XMost() - aOrigin.x);
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const CSSCoord top = std::abs(aOrigin.y - topLeft.y);
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const CSSCoord bottom = std::abs(aContainingBlock.YMost() - aOrigin.y);
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switch (aRaySizeType) {
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case StyleRaySize::ClosestSide:
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return std::min({left, right, top, bottom});
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case StyleRaySize::FarthestSide:
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return std::max({left, right, top, bottom});
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case StyleRaySize::ClosestCorner:
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case StyleRaySize::FarthestCorner: {
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CSSCoord h = 0;
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CSSCoord v = 0;
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if (aRaySizeType == StyleRaySize::ClosestCorner) {
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h = std::min(left, right);
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v = std::min(top, bottom);
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} else {
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h = std::max(left, right);
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v = std::max(top, bottom);
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}
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return sqrt(h.value * h.value + v.value * v.value);
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}
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case StyleRaySize::Sides:
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MOZ_ASSERT_UNREACHABLE("Unsupported ray size");
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}
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return 0.0;
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}
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static CSSCoord ComputeRayUsedDistance(
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const StyleRayFunction& aRay, const LengthPercentage& aDistance,
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const CSSCoord& aPathLength, const CSSCoord& aRayContainReferenceLength) {
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CSSCoord usedDistance = aDistance.ResolveToCSSPixels(aPathLength);
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if (!aRay.contain) {
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return usedDistance;
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}
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// The length of the offset path is reduced so that the element stays within
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// the containing block even at offset-distance: 100%. Specifically, the
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// path’s length is reduced by half the width or half the height of the
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// element’s border box, whichever is larger, and floored at zero.
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// https://drafts.fxtf.org/motion-1/#valdef-ray-contain
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return std::max((usedDistance - aRayContainReferenceLength / 2.0f).value,
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0.0f);
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}
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/* static */
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Maybe<ResolvedMotionPathData> MotionPathUtils::ResolveMotionPath(
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const OffsetPathData& aPath, const LengthPercentage& aDistance,
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const StyleOffsetRotate& aRotate, const StylePositionOrAuto& aAnchor,
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const StyleOffsetPosition& aPosition, const CSSPoint& aTransformOrigin,
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TransformReferenceBox& aRefBox, const CSSPoint& aAnchorPointAdjustment) {
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if (aPath.IsNone()) {
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return Nothing();
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}
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// Compute the point and angle for creating the equivalent translate and
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// rotate.
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double directionAngle = 0.0;
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gfx::Point point;
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if (aPath.IsShape()) {
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const auto& data = aPath.AsShape();
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RefPtr<gfx::Path> path = data.mGfxPath;
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MOZ_ASSERT(path, "The empty path is not allowed");
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// Per the spec, we have to convert offset distance to pixels, with 100%
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// being converted to total length. So here |gfxPath| is built with CSS
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// pixel, and we calculate |pathLength| and |computedDistance| with CSS
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// pixel as well.
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gfx::Float pathLength = path->ComputeLength();
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gfx::Float usedDistance =
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aDistance.ResolveToCSSPixels(CSSCoord(pathLength));
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if (data.mIsClosedLoop) {
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// Per the spec, let used offset distance be equal to offset distance
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// modulus the total length of the path. If the total length of the path
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// is 0, used offset distance is also 0.
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usedDistance = pathLength > 0.0 ? fmod(usedDistance, pathLength) : 0.0;
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// We make sure |usedDistance| is 0.0 or a positive value.
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if (usedDistance < 0.0) {
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usedDistance += pathLength;
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}
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} else {
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// Per the spec, for unclosed interval, let used offset distance be equal
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// to offset distance clamped by 0 and the total length of the path.
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usedDistance = std::clamp(usedDistance, 0.0f, pathLength);
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}
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gfx::Point tangent;
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point = path->ComputePointAtLength(usedDistance, &tangent);
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// Basically, |point| should be a relative distance between the current
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// position and the target position. The built |path| is in the coordinate
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// system of its containing block. Therefore, we have to take the current
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// position of this box into account to offset the translation so it's final
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// position is not affected by other boxes in the same containing block.
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point -= NSPointToPoint(data.mCurrentPosition, AppUnitsPerCSSPixel());
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// If the path length is 0, it's unlikely to get a valid tangent angle, e.g.
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// it may be (0, 0). And so we may get an undefined value from atan2().
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// Therefore, we use 0rad as the default behavior.
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directionAngle =
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pathLength < std::numeric_limits<gfx::Float>::epsilon()
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? 0.0
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: atan2((double)tangent.y, (double)tangent.x); // in Radian.
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} else if (aPath.IsRay()) {
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const auto& ray = aPath.AsRay();
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MOZ_ASSERT(ray.mRay);
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// Compute the origin, where the ray’s line begins (the 0% position).
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// https://drafts.fxtf.org/motion-1/#ray-origin
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const CSSPoint origin = CSSPoint::FromAppUnits(ComputePosition(
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ray.mRay->position, aPosition, ray.mCoordBox, ray.mCurrentPosition));
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const CSSCoord pathLength =
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ComputeRayPathLength(ray.mRay->size, ray.mRay->angle, origin,
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CSSRect::FromAppUnits(ray.mCoordBox));
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const CSSCoord usedDistance = ComputeRayUsedDistance(
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*ray.mRay, aDistance, pathLength, ray.mContainReferenceLength);
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// 0deg pointing up and positive angles representing clockwise rotation.
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directionAngle =
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StyleAngle{ray.mRay->angle.ToDegrees() - 90.0f}.ToRadians();
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// The vector from the current position of this box to the origin of this
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// polar coordinate system.
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const gfx::Point vectorToOrigin =
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(origin - CSSPoint::FromAppUnits(ray.mCurrentPosition))
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.ToUnknownPoint();
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// |vectorToOrigin| + The vector from the origin to this polar coordinate,
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// (|usedDistance|, |directionAngle|), i.e. the vector from the current
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// position to this polar coordinate.
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point =
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vectorToOrigin +
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gfx::Point(usedDistance * static_cast<gfx::Float>(cos(directionAngle)),
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usedDistance * static_cast<gfx::Float>(sin(directionAngle)));
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} else {
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MOZ_ASSERT_UNREACHABLE("Unsupported offset-path value");
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return Nothing();
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}
|
||
|
||
// If |rotate.auto_| is true, the element should be rotated by the angle of
|
||
// the direction (i.e. directional tangent vector) of the offset-path, and the
|
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// computed value of <angle> is added to this.
|
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// Otherwise, the element has a constant clockwise rotation transformation
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// applied to it by the specified rotation angle. (i.e. Don't need to
|
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// consider the direction of the path.)
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gfx::Float angle = static_cast<gfx::Float>(
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(aRotate.auto_ ? directionAngle : 0.0) + aRotate.angle.ToRadians());
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|
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// Compute the offset for motion path translate.
|
||
// Bug 1559232: the translate parameters will be adjusted more after we
|
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// support offset-position.
|
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// Per the spec, the default offset-anchor is `auto`, so initialize the anchor
|
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// point to transform-origin.
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CSSPoint anchorPoint(aTransformOrigin);
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gfx::Point shift;
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if (!aAnchor.IsAuto()) {
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const auto& pos = aAnchor.AsPosition();
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anchorPoint = nsStyleTransformMatrix::Convert2DPosition(
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pos.horizontal, pos.vertical, aRefBox);
|
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// We need this value to shift the origin from transform-origin to
|
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// offset-anchor (and vice versa).
|
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// See nsStyleTransformMatrix::ReadTransform for more details.
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shift = (anchorPoint - aTransformOrigin).ToUnknownPoint();
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}
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anchorPoint += aAnchorPointAdjustment;
|
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|
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return Some(ResolvedMotionPathData{point - anchorPoint.ToUnknownPoint(),
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angle, shift});
|
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}
|
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|
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static inline bool IsClosedLoop(const StyleSVGPathData& aPathData) {
|
||
return !aPathData._0.AsSpan().empty() &&
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aPathData._0.AsSpan().rbegin()->IsClose();
|
||
}
|
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|
||
// Create a path for "inset(0 round X)", where X is the value of border-radius
|
||
// on the element that establishes the containing block for this element.
|
||
static already_AddRefed<gfx::Path> BuildSimpleInsetPath(
|
||
const StyleBorderRadius& aBorderRadius, const nsRect& aCoordBox,
|
||
gfx::PathBuilder* aPathBuilder) {
|
||
if (!aPathBuilder) {
|
||
return nullptr;
|
||
}
|
||
|
||
const nsRect insetRect = ShapeUtils::ComputeInsetRect(
|
||
StyleRect<LengthPercentage>::WithAllSides(LengthPercentage::Zero()),
|
||
aCoordBox);
|
||
nscoord radii[8];
|
||
const bool hasRadii =
|
||
ShapeUtils::ComputeRectRadii(aBorderRadius, aCoordBox, insetRect, radii);
|
||
return ShapeUtils::BuildRectPath(insetRect, hasRadii ? radii : nullptr,
|
||
aCoordBox, AppUnitsPerCSSPixel(),
|
||
aPathBuilder);
|
||
}
|
||
|
||
// Create a path for `path("m 0 0")`, which is the default URL path if we cannot
|
||
// resolve a SVG shape element.
|
||
// https://drafts.fxtf.org/motion-1/#valdef-offset-path-url
|
||
static already_AddRefed<gfx::Path> BuildDefaultPathForURL(
|
||
gfx::PathBuilder* aBuilder) {
|
||
if (!aBuilder) {
|
||
return nullptr;
|
||
}
|
||
|
||
Array<const StylePathCommand, 1> array(StylePathCommand::Move(
|
||
StyleByTo::By, StyleCoordinatePair<StyleCSSFloat>{0.0, 0.0}));
|
||
return SVGPathData::BuildPath(array, aBuilder, StyleStrokeLinecap::Butt, 0.0);
|
||
}
|
||
|
||
// Generate data for motion path on the main thread.
|
||
static OffsetPathData GenerateOffsetPathData(const nsIFrame* aFrame) {
|
||
const StyleOffsetPath& offsetPath = aFrame->StyleDisplay()->mOffsetPath;
|
||
if (offsetPath.IsNone()) {
|
||
return OffsetPathData::None();
|
||
}
|
||
|
||
// Handle ray().
|
||
if (offsetPath.IsRay()) {
|
||
nsRect coordBox;
|
||
const nsIFrame* containingBlockFrame =
|
||
MotionPathUtils::GetOffsetPathReferenceBox(aFrame, coordBox);
|
||
return !containingBlockFrame
|
||
? OffsetPathData::None()
|
||
: OffsetPathData::Ray(
|
||
offsetPath.AsRay(), std::move(coordBox),
|
||
aFrame->GetOffsetTo(containingBlockFrame),
|
||
MotionPathUtils::GetRayContainReferenceSize(
|
||
const_cast<nsIFrame*>(aFrame)));
|
||
}
|
||
|
||
// Handle path(). We cache it so we handle it separately.
|
||
// FIXME: Bug 1837042, cache gfx::Path for shapes other than path(). Once we
|
||
// cache all basic shapes, we can merge this branch into other basic shapes.
|
||
if (offsetPath.IsPath()) {
|
||
const StyleSVGPathData& pathData = offsetPath.AsSVGPathData();
|
||
RefPtr<gfx::Path> gfxPath =
|
||
aFrame->GetProperty(nsIFrame::OffsetPathCache());
|
||
MOZ_ASSERT(gfxPath || pathData._0.IsEmpty(),
|
||
"Should have a valid cached gfx::Path or an empty path string");
|
||
// FIXME: Bug 1836847. Once we support "at <position>" for path(), we have
|
||
// to give it the current box position.
|
||
return OffsetPathData::Shape(gfxPath.forget(), {}, IsClosedLoop(pathData));
|
||
}
|
||
|
||
nsRect coordBox;
|
||
const nsIFrame* containingFrame =
|
||
MotionPathUtils::GetOffsetPathReferenceBox(aFrame, coordBox);
|
||
if (!containingFrame || coordBox.IsEmpty()) {
|
||
return OffsetPathData::None();
|
||
}
|
||
nsPoint currentPosition = aFrame->GetOffsetTo(containingFrame);
|
||
RefPtr<gfx::PathBuilder> builder = MotionPathUtils::GetPathBuilder();
|
||
|
||
if (offsetPath.IsUrl()) {
|
||
dom::SVGGeometryElement* element =
|
||
SVGObserverUtils::GetAndObserveGeometry(const_cast<nsIFrame*>(aFrame));
|
||
if (!element) {
|
||
// Note: This behaves as path("m 0 0") (a <basic-shape>).
|
||
RefPtr<gfx::Path> path = BuildDefaultPathForURL(builder);
|
||
// FIXME: Bug 1836847. Once we support "at <position>" for path(), we have
|
||
// to give it the current box position.
|
||
return path ? OffsetPathData::Shape(path.forget(), {}, false)
|
||
: OffsetPathData::None();
|
||
}
|
||
|
||
// We just need this path to calculate the specific point and direction
|
||
// angle, so use measuring function and get the benefit of caching the path
|
||
// in the SVG shape element.
|
||
RefPtr<gfx::Path> path = element->GetOrBuildPathForMeasuring();
|
||
|
||
// The built |path| from SVG shape element doesn't take |coordBox| into
|
||
// account. It uses the SVG viewport as its coordinate system. So after
|
||
// mapping it into the CSS layout, we should use |coordBox| as its viewport
|
||
// and user coordinate system. |currentPosition| is based on the border-box
|
||
// of the containing block. Therefore, we have to apply an extra translation
|
||
// to put it at the correct position based on |coordBox|.
|
||
//
|
||
// Note: we reuse |OffsetPathData::ShapeData::mCurrentPosition| to include
|
||
// this extra translation, so we don't have to add an extra field.
|
||
nsPoint positionInCoordBox = currentPosition - coordBox.TopLeft();
|
||
return path ? OffsetPathData::Shape(path.forget(),
|
||
std::move(positionInCoordBox),
|
||
element->IsClosedLoop())
|
||
: OffsetPathData::None();
|
||
}
|
||
|
||
// The rest part is to handle "<basic-shape> || <coord-box>".
|
||
MOZ_ASSERT(offsetPath.IsBasicShapeOrCoordBox());
|
||
|
||
const nsStyleDisplay* disp = aFrame->StyleDisplay();
|
||
RefPtr<gfx::Path> path =
|
||
disp->mOffsetPath.IsCoordBox()
|
||
? BuildSimpleInsetPath(containingFrame->StyleBorder()->mBorderRadius,
|
||
coordBox, builder)
|
||
: MotionPathUtils::BuildPath(
|
||
disp->mOffsetPath.AsOffsetPath().path->AsShape(),
|
||
disp->mOffsetPosition, coordBox, currentPosition, builder);
|
||
return path ? OffsetPathData::Shape(path.forget(), std::move(currentPosition),
|
||
true)
|
||
: OffsetPathData::None();
|
||
}
|
||
|
||
/* static*/
|
||
Maybe<ResolvedMotionPathData> MotionPathUtils::ResolveMotionPath(
|
||
const nsIFrame* aFrame, TransformReferenceBox& aRefBox) {
|
||
MOZ_ASSERT(aFrame);
|
||
|
||
const nsStyleDisplay* display = aFrame->StyleDisplay();
|
||
|
||
// FIXME: It's possible to refactor the calculation of transform-origin, so we
|
||
// could calculate from the caller, and reuse the value in nsDisplayList.cpp.
|
||
CSSPoint transformOrigin = nsStyleTransformMatrix::Convert2DPosition(
|
||
display->mTransformOrigin.horizontal, display->mTransformOrigin.vertical,
|
||
aRefBox);
|
||
|
||
return ResolveMotionPath(
|
||
GenerateOffsetPathData(aFrame), display->mOffsetDistance,
|
||
display->mOffsetRotate, display->mOffsetAnchor, display->mOffsetPosition,
|
||
transformOrigin, aRefBox, ComputeAnchorPointAdjustment(*aFrame));
|
||
}
|
||
|
||
// Generate data for motion path on the compositor thread.
|
||
static OffsetPathData GenerateOffsetPathData(
|
||
const StyleOffsetPath& aOffsetPath,
|
||
const StyleOffsetPosition& aOffsetPosition,
|
||
const layers::MotionPathData& aMotionPathData,
|
||
gfx::Path* aCachedMotionPath) {
|
||
if (aOffsetPath.IsNone()) {
|
||
return OffsetPathData::None();
|
||
}
|
||
|
||
// Handle ray().
|
||
if (aOffsetPath.IsRay()) {
|
||
return aMotionPathData.coordBox().IsEmpty()
|
||
? OffsetPathData::None()
|
||
: OffsetPathData::Ray(
|
||
aOffsetPath.AsRay(), aMotionPathData.coordBox(),
|
||
aMotionPathData.currentPosition(),
|
||
aMotionPathData.rayContainReferenceLength());
|
||
}
|
||
|
||
// Handle path().
|
||
// FIXME: Bug 1837042, cache gfx::Path for shapes other than path().
|
||
if (aOffsetPath.IsPath()) {
|
||
const StyleSVGPathData& pathData = aOffsetPath.AsSVGPathData();
|
||
// If aCachedMotionPath is valid, we have a fixed path.
|
||
// This means we have pre-built it already and no need to update.
|
||
RefPtr<gfx::Path> path = aCachedMotionPath;
|
||
if (!path) {
|
||
RefPtr<gfx::PathBuilder> builder =
|
||
MotionPathUtils::GetCompositorPathBuilder();
|
||
path = MotionPathUtils::BuildSVGPath(pathData, builder);
|
||
}
|
||
// FIXME: Bug 1836847. Once we support "at <position>" for path(), we have
|
||
// to give it the current box position.
|
||
return OffsetPathData::Shape(path.forget(), {}, IsClosedLoop(pathData));
|
||
}
|
||
|
||
// The rest part is to handle "<basic-shape> || <coord-box>".
|
||
MOZ_ASSERT(aOffsetPath.IsBasicShapeOrCoordBox());
|
||
|
||
const nsRect& coordBox = aMotionPathData.coordBox();
|
||
if (coordBox.IsEmpty()) {
|
||
return OffsetPathData::None();
|
||
}
|
||
|
||
RefPtr<gfx::PathBuilder> builder =
|
||
MotionPathUtils::GetCompositorPathBuilder();
|
||
if (!builder) {
|
||
return OffsetPathData::None();
|
||
}
|
||
|
||
RefPtr<gfx::Path> path;
|
||
if (aOffsetPath.IsCoordBox()) {
|
||
const nsRect insetRect = ShapeUtils::ComputeInsetRect(
|
||
StyleRect<LengthPercentage>::WithAllSides(LengthPercentage::Zero()),
|
||
coordBox);
|
||
const nsTArray<nscoord>& radii = aMotionPathData.coordBoxInsetRadii();
|
||
path = ShapeUtils::BuildRectPath(
|
||
insetRect, radii.IsEmpty() ? nullptr : radii.Elements(), coordBox,
|
||
AppUnitsPerCSSPixel(), builder);
|
||
} else {
|
||
path = MotionPathUtils::BuildPath(
|
||
aOffsetPath.AsOffsetPath().path->AsShape(), aOffsetPosition, coordBox,
|
||
aMotionPathData.currentPosition(), builder);
|
||
}
|
||
|
||
return path ? OffsetPathData::Shape(
|
||
path.forget(), nsPoint(aMotionPathData.currentPosition()),
|
||
true)
|
||
: OffsetPathData::None();
|
||
}
|
||
|
||
/* static */
|
||
Maybe<ResolvedMotionPathData> MotionPathUtils::ResolveMotionPath(
|
||
const StyleOffsetPath* aPath, const StyleLengthPercentage* aDistance,
|
||
const StyleOffsetRotate* aRotate, const StylePositionOrAuto* aAnchor,
|
||
const StyleOffsetPosition* aPosition,
|
||
const Maybe<layers::MotionPathData>& aMotionPathData,
|
||
TransformReferenceBox& aRefBox, gfx::Path* aCachedMotionPath) {
|
||
if (!aPath) {
|
||
return Nothing();
|
||
}
|
||
|
||
MOZ_ASSERT(aMotionPathData);
|
||
|
||
auto zeroOffsetDistance = LengthPercentage::Zero();
|
||
auto autoOffsetRotate = StyleOffsetRotate{true, StyleAngle::Zero()};
|
||
auto autoOffsetAnchor = StylePositionOrAuto::Auto();
|
||
auto autoOffsetPosition = StyleOffsetPosition::Auto();
|
||
return ResolveMotionPath(
|
||
GenerateOffsetPathData(*aPath,
|
||
aPosition ? *aPosition : autoOffsetPosition,
|
||
*aMotionPathData, aCachedMotionPath),
|
||
aDistance ? *aDistance : zeroOffsetDistance,
|
||
aRotate ? *aRotate : autoOffsetRotate,
|
||
aAnchor ? *aAnchor : autoOffsetAnchor,
|
||
aPosition ? *aPosition : autoOffsetPosition, aMotionPathData->origin(),
|
||
aRefBox, aMotionPathData->anchorAdjustment());
|
||
}
|
||
|
||
/* static */
|
||
already_AddRefed<gfx::Path> MotionPathUtils::BuildSVGPath(
|
||
const StyleSVGPathData& aPath, gfx::PathBuilder* aPathBuilder) {
|
||
if (!aPathBuilder) {
|
||
return nullptr;
|
||
}
|
||
|
||
const Span<const StylePathCommand>& path = aPath._0.AsSpan();
|
||
return SVGPathData::BuildPath(path, aPathBuilder, StyleStrokeLinecap::Butt,
|
||
0.0);
|
||
}
|
||
|
||
static already_AddRefed<gfx::Path> BuildShape(
|
||
const Span<const StyleShapeCommand>& aShape, gfx::PathBuilder* aPathBuilder,
|
||
const nsRect& aCoordBox) {
|
||
if (!aPathBuilder) {
|
||
return nullptr;
|
||
}
|
||
|
||
// For motion path, we always use CSSPixel unit to compute the offset
|
||
// transform (i.e. motion path transform).
|
||
const auto rect = CSSRect::FromAppUnits(aCoordBox);
|
||
return SVGPathData::BuildPath(aShape, aPathBuilder, StyleStrokeLinecap::Butt,
|
||
0.0, rect.Size(),
|
||
rect.TopLeft().ToUnknownPoint());
|
||
}
|
||
|
||
/* static */
|
||
already_AddRefed<gfx::Path> MotionPathUtils::BuildPath(
|
||
const StyleBasicShape& aBasicShape,
|
||
const StyleOffsetPosition& aOffsetPosition, const nsRect& aCoordBox,
|
||
const nsPoint& aCurrentPosition, gfx::PathBuilder* aPathBuilder) {
|
||
if (!aPathBuilder) {
|
||
return nullptr;
|
||
}
|
||
|
||
switch (aBasicShape.tag) {
|
||
case StyleBasicShape::Tag::Circle: {
|
||
const nsPoint center =
|
||
ComputePosition(aBasicShape.AsCircle().position, aOffsetPosition,
|
||
aCoordBox, aCurrentPosition);
|
||
return ShapeUtils::BuildCirclePath(aBasicShape, aCoordBox, center,
|
||
AppUnitsPerCSSPixel(), aPathBuilder);
|
||
}
|
||
case StyleBasicShape::Tag::Ellipse: {
|
||
const nsPoint center =
|
||
ComputePosition(aBasicShape.AsEllipse().position, aOffsetPosition,
|
||
aCoordBox, aCurrentPosition);
|
||
return ShapeUtils::BuildEllipsePath(aBasicShape, aCoordBox, center,
|
||
AppUnitsPerCSSPixel(), aPathBuilder);
|
||
}
|
||
case StyleBasicShape::Tag::Rect:
|
||
return ShapeUtils::BuildInsetPath(aBasicShape, aCoordBox,
|
||
AppUnitsPerCSSPixel(), aPathBuilder);
|
||
case StyleBasicShape::Tag::Polygon:
|
||
return ShapeUtils::BuildPolygonPath(aBasicShape, aCoordBox,
|
||
AppUnitsPerCSSPixel(), aPathBuilder);
|
||
case StyleBasicShape::Tag::PathOrShape: {
|
||
// FIXME: Bug 1836847. Once we support "at <position>" for path(), we have
|
||
// to also check its containing block as well. For now, we are still
|
||
// building its gfx::Path directly by its SVGPathData without other
|
||
// reference. https://github.com/w3c/fxtf-drafts/issues/504
|
||
const auto& pathOrShape = aBasicShape.AsPathOrShape();
|
||
if (pathOrShape.IsPath()) {
|
||
return BuildSVGPath(pathOrShape.AsPath().path, aPathBuilder);
|
||
}
|
||
|
||
// Note that shape() always defines the initial position, i.e. "from x y",
|
||
// by its first move command, so |aOffsetPosition|, i.e. offset-position
|
||
// property, is ignored.
|
||
return BuildShape(pathOrShape.AsShape().commands.AsSpan(), aPathBuilder,
|
||
aCoordBox);
|
||
}
|
||
}
|
||
|
||
return nullptr;
|
||
}
|
||
|
||
/* static */
|
||
already_AddRefed<gfx::PathBuilder> MotionPathUtils::GetPathBuilder() {
|
||
// Here we only need to build a valid path for motion path, so
|
||
// using the default values of stroke-width, stoke-linecap, and fill-rule
|
||
// is fine for now because what we want is to get the point and its normal
|
||
// vector along the path, instead of rendering it.
|
||
RefPtr<gfx::PathBuilder> builder =
|
||
gfxPlatform::GetPlatform()
|
||
->ScreenReferenceDrawTarget()
|
||
->CreatePathBuilder(gfx::FillRule::FILL_WINDING);
|
||
return builder.forget();
|
||
}
|
||
|
||
/* static */
|
||
already_AddRefed<gfx::PathBuilder> MotionPathUtils::GetCompositorPathBuilder() {
|
||
// FIXME: Perhaps we need a PathBuilder which is independent on the backend.
|
||
RefPtr<gfx::PathBuilder> builder =
|
||
gfxPlatform::Initialized()
|
||
? gfxPlatform::GetPlatform()
|
||
->ScreenReferenceDrawTarget()
|
||
->CreatePathBuilder(gfx::FillRule::FILL_WINDING)
|
||
: gfx::Factory::CreateSimplePathBuilder();
|
||
return builder.forget();
|
||
}
|
||
|
||
} // namespace mozilla
|