Adding upstream version 110.0.1.upstream/110.0.1upstream

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

1 files changed, 273 insertions, 0 deletions

diff --git a/layout/svg/SVGViewportFrame.cpp b/layout/svg/SVGViewportFrame.cpp
new file mode 100644
index 0000000000..0b351dfa1b
--- /dev/null
+++ b/layout/svg/SVGViewportFrame.cpp
@@ -0,0 +1,273 @@
+/* -*- 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 "SVGViewportFrame.h"
+
+// Keep others in (case-insensitive) order:
+#include "gfx2DGlue.h"
+#include "gfxContext.h"
+#include "mozilla/ISVGDisplayableFrame.h"
+#include "mozilla/SVGContainerFrame.h"
+#include "mozilla/SVGUtils.h"
+#include "mozilla/dom/SVGViewportElement.h"
+#include "nsLayoutUtils.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+using namespace mozilla::image;
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// ISVGDisplayableFrame methods
+
+void SVGViewportFrame::PaintSVG(gfxContext& aContext,
+                                const gfxMatrix& aTransform,
+                                imgDrawingParams& aImgParams,
+                                const nsIntRect* aDirtyRect) {
+  NS_ASSERTION(
+      !NS_SVGDisplayListPaintingEnabled() || (mState & NS_FRAME_IS_NONDISPLAY),
+      "If display lists are enabled, only painting of non-display "
+      "SVG should take this code path");
+
+  gfxContextAutoSaveRestore autoSR;
+
+  if (StyleDisplay()->IsScrollableOverflow()) {
+    float x, y, width, height;
+    static_cast<SVGViewportElement*>(GetContent())
+        ->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
+
+    if (width <= 0 || height <= 0) {
+      return;
+    }
+
+    autoSR.SetContext(&aContext);
+    gfxRect clipRect = SVGUtils::GetClipRectForFrame(this, x, y, width, height);
+    SVGUtils::SetClipRect(&aContext, aTransform, clipRect);
+  }
+
+  SVGDisplayContainerFrame::PaintSVG(aContext, aTransform, aImgParams,
+                                     aDirtyRect);
+}
+
+void SVGViewportFrame::ReflowSVG() {
+  // mRect must be set before FinishAndStoreOverflow is called in order
+  // for our overflow areas to be clipped correctly.
+  float x, y, width, height;
+  static_cast<SVGViewportElement*>(GetContent())
+      ->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
+  mRect = nsLayoutUtils::RoundGfxRectToAppRect(gfxRect(x, y, width, height),
+                                               AppUnitsPerCSSPixel());
+
+  // If we have a filter, we need to invalidate ourselves because filter
+  // output can change even if none of our descendants need repainting.
+  if (StyleEffects()->HasFilters()) {
+    InvalidateFrame();
+  }
+
+  SVGDisplayContainerFrame::ReflowSVG();
+}
+
+void SVGViewportFrame::NotifySVGChanged(uint32_t aFlags) {
+  MOZ_ASSERT(aFlags & (TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED),
+             "Invalidation logic may need adjusting");
+
+  if (aFlags & COORD_CONTEXT_CHANGED) {
+    SVGViewportElement* svg = static_cast<SVGViewportElement*>(GetContent());
+
+    bool xOrYIsPercentage =
+        svg->mLengthAttributes[SVGViewportElement::ATTR_X].IsPercentage() ||
+        svg->mLengthAttributes[SVGViewportElement::ATTR_Y].IsPercentage();
+    bool widthOrHeightIsPercentage =
+        svg->mLengthAttributes[SVGViewportElement::ATTR_WIDTH].IsPercentage() ||
+        svg->mLengthAttributes[SVGViewportElement::ATTR_HEIGHT].IsPercentage();
+
+    if (xOrYIsPercentage || widthOrHeightIsPercentage) {
+      // Ancestor changes can't affect how we render from the perspective of
+      // any rendering observers that we may have, so we don't need to
+      // invalidate them. We also don't need to invalidate ourself, since our
+      // changed ancestor will have invalidated its entire area, which includes
+      // our area.
+      // For perf reasons we call this before calling NotifySVGChanged() below.
+      SVGUtils::ScheduleReflowSVG(this);
+    }
+
+    // Coordinate context changes affect mCanvasTM if we have a
+    // percentage 'x' or 'y', or if we have a percentage 'width' or 'height' AND
+    // a 'viewBox'.
+
+    if (!(aFlags & TRANSFORM_CHANGED) &&
+        (xOrYIsPercentage ||
+         (widthOrHeightIsPercentage && svg->HasViewBox()))) {
+      aFlags |= TRANSFORM_CHANGED;
+    }
+
+    if (svg->HasViewBox() || !widthOrHeightIsPercentage) {
+      // Remove COORD_CONTEXT_CHANGED, since we establish the coordinate
+      // context for our descendants and this notification won't change its
+      // dimensions:
+      aFlags &= ~COORD_CONTEXT_CHANGED;
+
+      if (!aFlags) {
+        return;  // No notification flags left
+      }
+    }
+  }
+
+  SVGDisplayContainerFrame::NotifySVGChanged(aFlags);
+}
+
+SVGBBox SVGViewportFrame::GetBBoxContribution(const Matrix& aToBBoxUserspace,
+                                              uint32_t aFlags) {
+  // XXXjwatt It seems like authors would want the result to be clipped by the
+  // viewport we establish if IsScrollableOverflow() is true.  We should
+  // consider doing that.  See bug 1350755.
+
+  SVGBBox bbox;
+
+  if (aFlags & SVGUtils::eForGetClientRects) {
+    // XXXjwatt For consistency with the old code this code includes the
+    // viewport we establish in the result, but only includes the bounds of our
+    // descendants if they are not clipped to that viewport.  However, this is
+    // both inconsistent with Chrome and with the specs.  See bug 1350755.
+    // Ideally getClientRects/getBoundingClientRect should be consistent with
+    // getBBox.
+    float x, y, w, h;
+    static_cast<SVGViewportElement*>(GetContent())
+        ->GetAnimatedLengthValues(&x, &y, &w, &h, nullptr);
+    if (w < 0.0f) w = 0.0f;
+    if (h < 0.0f) h = 0.0f;
+    Rect viewport(x, y, w, h);
+    bbox = aToBBoxUserspace.TransformBounds(viewport);
+    if (StyleDisplay()->IsScrollableOverflow()) {
+      return bbox;
+    }
+    // Else we're not clipping to our viewport so we fall through and include
+    // the bounds of our children.
+  }
+
+  SVGBBox descendantsBbox =
+      SVGDisplayContainerFrame::GetBBoxContribution(aToBBoxUserspace, aFlags);
+
+  bbox.UnionEdges(descendantsBbox);
+
+  return bbox;
+}
+
+nsresult SVGViewportFrame::AttributeChanged(int32_t aNameSpaceID,
+                                            nsAtom* aAttribute,
+                                            int32_t aModType) {
+  if (aNameSpaceID == kNameSpaceID_None &&
+      !HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
+    SVGViewportElement* content =
+        static_cast<SVGViewportElement*>(GetContent());
+
+    if (aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height) {
+      nsLayoutUtils::PostRestyleEvent(
+          mContent->AsElement(), RestyleHint{0},
+          nsChangeHint_InvalidateRenderingObservers);
+      SVGUtils::ScheduleReflowSVG(this);
+
+      if (content->HasViewBoxOrSyntheticViewBox()) {
+        // make sure our cached transform matrix gets (lazily) updated
+        mCanvasTM = nullptr;
+        content->ChildrenOnlyTransformChanged();
+        SVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
+      } else {
+        uint32_t flags = COORD_CONTEXT_CHANGED;
+        if (mCanvasTM && mCanvasTM->IsSingular()) {
+          mCanvasTM = nullptr;
+          flags |= TRANSFORM_CHANGED;
+        }
+        SVGUtils::NotifyChildrenOfSVGChange(this, flags);
+      }
+
+    } else if (aAttribute == nsGkAtoms::transform ||
+               aAttribute == nsGkAtoms::preserveAspectRatio ||
+               aAttribute == nsGkAtoms::viewBox || aAttribute == nsGkAtoms::x ||
+               aAttribute == nsGkAtoms::y) {
+      // make sure our cached transform matrix gets (lazily) updated
+      mCanvasTM = nullptr;
+
+      SVGUtils::NotifyChildrenOfSVGChange(
+          this, aAttribute == nsGkAtoms::viewBox
+                    ? TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED
+                    : TRANSFORM_CHANGED);
+
+      // We don't invalidate for transform changes (the layers code does that).
+      // Also note that SVGTransformableElement::GetAttributeChangeHint will
+      // return nsChangeHint_UpdateOverflow for "transform" attribute changes
+      // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
+
+      if (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y) {
+        nsLayoutUtils::PostRestyleEvent(
+            mContent->AsElement(), RestyleHint{0},
+            nsChangeHint_InvalidateRenderingObservers);
+        SVGUtils::ScheduleReflowSVG(this);
+      } else if (aAttribute == nsGkAtoms::viewBox ||
+                 (aAttribute == nsGkAtoms::preserveAspectRatio &&
+                  content->HasViewBoxOrSyntheticViewBox())) {
+        content->ChildrenOnlyTransformChanged();
+        // SchedulePaint sets a global state flag so we only need to call it
+        // once (on ourself is fine), not once on each child (despite bug
+        // 828240).
+        SchedulePaint();
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+nsIFrame* SVGViewportFrame::GetFrameForPoint(const gfxPoint& aPoint) {
+  NS_ASSERTION(!NS_SVGDisplayListHitTestingEnabled() ||
+                   (mState & NS_FRAME_IS_NONDISPLAY),
+               "If display lists are enabled, only hit-testing of non-display "
+               "SVG should take this code path");
+
+  if (StyleDisplay()->IsScrollableOverflow()) {
+    Rect clip;
+    static_cast<SVGElement*>(GetContent())
+        ->GetAnimatedLengthValues(&clip.x, &clip.y, &clip.width, &clip.height,
+                                  nullptr);
+    if (!clip.Contains(ToPoint(aPoint))) {
+      return nullptr;
+    }
+  }
+
+  return SVGDisplayContainerFrame::GetFrameForPoint(aPoint);
+}
+
+//----------------------------------------------------------------------
+// ISVGSVGFrame methods:
+
+void SVGViewportFrame::NotifyViewportOrTransformChanged(uint32_t aFlags) {
+  // The dimensions of inner-<svg> frames are purely defined by their "width"
+  // and "height" attributes, and transform changes can only occur as a result
+  // of changes to their "width", "height", "viewBox" or "preserveAspectRatio"
+  // attributes. Changes to all of these attributes are handled in
+  // AttributeChanged(), so we should never be called.
+  NS_ERROR("Not called for SVGViewportFrame");
+}
+
+//----------------------------------------------------------------------
+// SVGContainerFrame methods:
+
+bool SVGViewportFrame::HasChildrenOnlyTransform(gfx::Matrix* aTransform) const {
+  SVGViewportElement* content = static_cast<SVGViewportElement*>(GetContent());
+
+  if (content->HasViewBoxOrSyntheticViewBox()) {
+    // XXX Maybe return false if the transform is the identity transform?
+    if (aTransform) {
+      *aTransform = content->GetViewBoxTransform();
+    }
+    return true;
+  }
+  return false;
+}
+
+}  // namespace mozilla