Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 243 insertions, 0 deletions

diff --git a/layout/svg/CSSClipPathInstance.cpp b/layout/svg/CSSClipPathInstance.cpp
new file mode 100644
index 0000000000..8fd51b2799
--- /dev/null
+++ b/layout/svg/CSSClipPathInstance.cpp
@@ -0,0 +1,243 @@
+/* -*- 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