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/* -*- 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/. */
// Main header first:
#include "CSSClipPathInstance.h"
#include "mozilla/dom/SVGElement.h"
#include "mozilla/dom/SVGPathData.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/ShapeUtils.h"
#include "mozilla/SVGUtils.h"
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "nsCSSRendering.h"
#include "nsIFrame.h"
#include "nsLayoutUtils.h"
using namespace mozilla::dom;
using namespace mozilla::gfx;
namespace mozilla {
/* static*/
void CSSClipPathInstance::ApplyBasicShapeOrPathClip(
gfxContext& aContext, nsIFrame* aFrame, const gfxMatrix& aTransform) {
RefPtr<Path> path =
CreateClipPathForFrame(aContext.GetDrawTarget(), aFrame, aTransform);
if (!path) {
// This behavior matches |SVGClipPathFrame::ApplyClipPath()|.
// https://www.w3.org/TR/css-masking-1/#ClipPathElement:
// "An empty clipping path will completely clip away the element that had
// the clip-path property applied."
aContext.Clip(Rect());
return;
}
aContext.Clip(path);
}
/* static*/
RefPtr<Path> CSSClipPathInstance::CreateClipPathForFrame(
gfx::DrawTarget* aDt, nsIFrame* aFrame, const gfxMatrix& aTransform) {
const auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
MOZ_ASSERT(clipPathStyle.IsShape() || clipPathStyle.IsBox() ||
clipPathStyle.IsPath(),
"This is used with basic-shape, geometry-box, and path() only");
CSSClipPathInstance instance(aFrame, clipPathStyle);
return instance.CreateClipPath(aDt, aTransform);
}
/* static*/
bool CSSClipPathInstance::HitTestBasicShapeOrPathClip(nsIFrame* aFrame,
const gfxPoint& aPoint) {
const auto& clipPathStyle = aFrame->StyleSVGReset()->mClipPath;
MOZ_ASSERT(!clipPathStyle.IsNone(), "unexpected none value");
MOZ_ASSERT(!clipPathStyle.IsUrl(), "unexpected url value");
CSSClipPathInstance instance(aFrame, clipPathStyle);
RefPtr<DrawTarget> drawTarget =
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
RefPtr<Path> path = instance.CreateClipPath(
drawTarget, SVGUtils::GetCSSPxToDevPxMatrix(aFrame));
float pixelRatio = float(AppUnitsPerCSSPixel()) /
aFrame->PresContext()->AppUnitsPerDevPixel();
return path && path->ContainsPoint(ToPoint(aPoint) * pixelRatio, Matrix());
}
/* static */
Maybe<Rect> CSSClipPathInstance::GetBoundingRectForBasicShapeOrPathClip(
nsIFrame* aFrame, const StyleClipPath& aClipPathStyle) {
MOZ_ASSERT(aClipPathStyle.IsShape() || aClipPathStyle.IsBox() ||
aClipPathStyle.IsPath());
CSSClipPathInstance instance(aFrame, aClipPathStyle);
RefPtr<DrawTarget> drawTarget =
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
RefPtr<Path> path = instance.CreateClipPath(
drawTarget, SVGUtils::GetCSSPxToDevPxMatrix(aFrame));
return path ? Some(path->GetBounds()) : Nothing();
}
already_AddRefed<Path> CSSClipPathInstance::CreateClipPath(
DrawTarget* aDrawTarget, const gfxMatrix& aTransform) {
if (mClipPathStyle.IsPath()) {
return CreateClipPathPath(aDrawTarget);
}
nscoord appUnitsPerDevPixel =
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
nsRect r;
if (mClipPathStyle.IsBox()) {
r = nsLayoutUtils::ComputeGeometryBox(mTargetFrame, mClipPathStyle.AsBox());
} else {
r = nsLayoutUtils::ComputeGeometryBox(mTargetFrame,
mClipPathStyle.AsShape()._1);
}
gfxRect rr(r.x, r.y, r.width, r.height);
rr.Scale(1.0 / AppUnitsPerCSSPixel());
rr = aTransform.TransformRect(rr);
rr.Scale(appUnitsPerDevPixel);
rr.Round();
r = nsRect(int(rr.x), int(rr.y), int(rr.width), int(rr.height));
if (mClipPathStyle.IsBox()) {
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
AppendRectToPath(builder, NSRectToRect(r, appUnitsPerDevPixel), true);
return builder->Finish();
}
MOZ_ASSERT(mClipPathStyle.IsShape());
r = ToAppUnits(r.ToNearestPixels(appUnitsPerDevPixel), appUnitsPerDevPixel);
const auto& basicShape = *mClipPathStyle.AsShape()._0;
switch (basicShape.tag) {
case StyleBasicShape::Tag::Circle:
return CreateClipPathCircle(aDrawTarget, r);
case StyleBasicShape::Tag::Ellipse:
return CreateClipPathEllipse(aDrawTarget, r);
case StyleBasicShape::Tag::Polygon:
return CreateClipPathPolygon(aDrawTarget, r);
case StyleBasicShape::Tag::Inset:
return CreateClipPathInset(aDrawTarget, r);
break;
default:
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected shape type");
}
// Return an empty Path:
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
return builder->Finish();
}
already_AddRefed<Path> CSSClipPathInstance::CreateClipPathCircle(
DrawTarget* aDrawTarget, const nsRect& aRefBox) {
const auto& basicShape = *mClipPathStyle.AsShape()._0;
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
nsPoint center =
ShapeUtils::ComputeCircleOrEllipseCenter(basicShape, aRefBox);
nscoord r = ShapeUtils::ComputeCircleRadius(basicShape, center, aRefBox);
nscoord appUnitsPerDevPixel =
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
builder->Arc(Point(center.x, center.y) / appUnitsPerDevPixel,
r / appUnitsPerDevPixel, 0, Float(2 * M_PI));
builder->Close();
return builder->Finish();
}
already_AddRefed<Path> CSSClipPathInstance::CreateClipPathEllipse(
DrawTarget* aDrawTarget, const nsRect& aRefBox) {
const auto& basicShape = *mClipPathStyle.AsShape()._0;
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
nsPoint center =
ShapeUtils::ComputeCircleOrEllipseCenter(basicShape, aRefBox);
nsSize radii = ShapeUtils::ComputeEllipseRadii(basicShape, center, aRefBox);
nscoord appUnitsPerDevPixel =
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
EllipseToBezier(builder.get(),
Point(center.x, center.y) / appUnitsPerDevPixel,
Size(radii.width, radii.height) / appUnitsPerDevPixel);
builder->Close();
return builder->Finish();
}
already_AddRefed<Path> CSSClipPathInstance::CreateClipPathPolygon(
DrawTarget* aDrawTarget, const nsRect& aRefBox) {
const auto& basicShape = *mClipPathStyle.AsShape()._0;
auto fillRule = basicShape.AsPolygon().fill == StyleFillRule::Nonzero
? FillRule::FILL_WINDING
: FillRule::FILL_EVEN_ODD;
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder(fillRule);
nsTArray<nsPoint> vertices =
ShapeUtils::ComputePolygonVertices(basicShape, aRefBox);
if (vertices.IsEmpty()) {
MOZ_ASSERT_UNREACHABLE(
"ComputePolygonVertices() should've given us some vertices!");
} else {
nscoord appUnitsPerDevPixel =
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
builder->MoveTo(NSPointToPoint(vertices[0], appUnitsPerDevPixel));
for (size_t i = 1; i < vertices.Length(); ++i) {
builder->LineTo(NSPointToPoint(vertices[i], appUnitsPerDevPixel));
}
}
builder->Close();
return builder->Finish();
}
already_AddRefed<Path> CSSClipPathInstance::CreateClipPathInset(
DrawTarget* aDrawTarget, const nsRect& aRefBox) {
const auto& basicShape = *mClipPathStyle.AsShape()._0;
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder();
nscoord appUnitsPerDevPixel =
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
const nsRect insetRect = ShapeUtils::ComputeInsetRect(basicShape, aRefBox);
const Rect insetRectPixels = NSRectToRect(insetRect, appUnitsPerDevPixel);
nscoord appUnitsRadii[8];
if (ShapeUtils::ComputeInsetRadii(basicShape, aRefBox, insetRect,
appUnitsRadii)) {
RectCornerRadii corners;
nsCSSRendering::ComputePixelRadii(appUnitsRadii, appUnitsPerDevPixel,
&corners);
AppendRoundedRectToPath(builder, insetRectPixels, corners, true);
} else {
AppendRectToPath(builder, insetRectPixels, true);
}
return builder->Finish();
}
already_AddRefed<Path> CSSClipPathInstance::CreateClipPathPath(
DrawTarget* aDrawTarget) {
const auto& path = mClipPathStyle.AsPath();
RefPtr<PathBuilder> builder = aDrawTarget->CreatePathBuilder(
path.fill == StyleFillRule::Nonzero ? FillRule::FILL_WINDING
: FillRule::FILL_EVEN_ODD);
float scale = float(AppUnitsPerCSSPixel()) /
mTargetFrame->PresContext()->AppUnitsPerDevPixel();
return SVGPathData::BuildPath(path.path._0.AsSpan(), builder,
StyleStrokeLinecap::Butt, 0.0, scale);
}
} // namespace mozilla
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