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-rw-r--r--layout/svg/CSSClipPathInstance.cpp243
1 files changed, 243 insertions, 0 deletions
diff --git a/layout/svg/CSSClipPathInstance.cpp b/layout/svg/CSSClipPathInstance.cpp
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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