Add m-esr52 at 52.6.0

1 files changed, 748 insertions, 0 deletions

diff --git a/layout/svg/nsSVGPatternFrame.cpp b/layout/svg/nsSVGPatternFrame.cpp
new file mode 100644
index 000000000..198163d7f
--- /dev/null
+++ b/layout/svg/nsSVGPatternFrame.cpp
@@ -0,0 +1,748 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsSVGPatternFrame.h"
+
+// Keep others in (case-insensitive) order:
+#include "gfx2DGlue.h"
+#include "gfxContext.h"
+#include "gfxMatrix.h"
+#include "gfxPattern.h"
+#include "gfxPlatform.h"
+#include "mozilla/gfx/2D.h"
+#include "nsContentUtils.h"
+#include "nsGkAtoms.h"
+#include "nsISVGChildFrame.h"
+#include "nsStyleContext.h"
+#include "nsSVGEffects.h"
+#include "nsSVGPathGeometryFrame.h"
+#include "mozilla/dom/SVGPatternElement.h"
+#include "nsSVGUtils.h"
+#include "nsSVGAnimatedTransformList.h"
+#include "SVGContentUtils.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+
+//----------------------------------------------------------------------
+// Helper classes
+
+class MOZ_RAII nsSVGPatternFrame::AutoPatternReferencer
+{
+public:
+  explicit AutoPatternReferencer(nsSVGPatternFrame *aFrame
+                                 MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
+    : mFrame(aFrame)
+  {
+    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+    // Reference loops should normally be detected in advance and handled, so
+    // we're not expecting to encounter them here
+    MOZ_ASSERT(!mFrame->mLoopFlag, "Undetected reference loop!");
+    mFrame->mLoopFlag = true;
+  }
+  ~AutoPatternReferencer() {
+    mFrame->mLoopFlag = false;
+  }
+private:
+  nsSVGPatternFrame *mFrame;
+  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsSVGPatternFrame::nsSVGPatternFrame(nsStyleContext* aContext)
+  : nsSVGPaintServerFrame(aContext)
+  , mLoopFlag(false)
+  , mNoHRefURI(false)
+{
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsSVGPatternFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods:
+
+nsresult
+nsSVGPatternFrame::AttributeChanged(int32_t         aNameSpaceID,
+                                    nsIAtom*        aAttribute,
+                                    int32_t         aModType)
+{
+  if (aNameSpaceID == kNameSpaceID_None &&
+      (aAttribute == nsGkAtoms::patternUnits ||
+       aAttribute == nsGkAtoms::patternContentUnits ||
+       aAttribute == nsGkAtoms::patternTransform ||
+       aAttribute == nsGkAtoms::x ||
+       aAttribute == nsGkAtoms::y ||
+       aAttribute == nsGkAtoms::width ||
+       aAttribute == nsGkAtoms::height ||
+       aAttribute == nsGkAtoms::preserveAspectRatio ||
+       aAttribute == nsGkAtoms::viewBox)) {
+    nsSVGEffects::InvalidateDirectRenderingObservers(this);
+  }
+
+  if ((aNameSpaceID == kNameSpaceID_XLink ||
+       aNameSpaceID == kNameSpaceID_None) &&
+      aAttribute == nsGkAtoms::href) {
+    // Blow away our reference, if any
+    Properties().Delete(nsSVGEffects::HrefAsPaintingProperty());
+    mNoHRefURI = false;
+    // And update whoever references us
+    nsSVGEffects::InvalidateDirectRenderingObservers(this);
+  }
+
+  return nsSVGPaintServerFrame::AttributeChanged(aNameSpaceID,
+                                                 aAttribute, aModType);
+}
+
+#ifdef DEBUG
+void
+nsSVGPatternFrame::Init(nsIContent*       aContent,
+                        nsContainerFrame* aParent,
+                        nsIFrame*         aPrevInFlow)
+{
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::pattern), "Content is not an SVG pattern");
+
+  nsSVGPaintServerFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsIAtom*
+nsSVGPatternFrame::GetType() const
+{
+  return nsGkAtoms::svgPatternFrame;
+}
+
+//----------------------------------------------------------------------
+// nsSVGContainerFrame methods:
+
+// If our GetCanvasTM is getting called, we
+// need to return *our current* transformation
+// matrix, which depends on our units parameters
+// and X, Y, Width, and Height
+gfxMatrix
+nsSVGPatternFrame::GetCanvasTM()
+{
+  if (mCTM) {
+    return *mCTM;
+  }
+
+  // Do we know our rendering parent?
+  if (mSource) {
+    // Yes, use it!
+    return mSource->GetCanvasTM();
+  }
+
+  // We get here when geometry in the <pattern> container is updated
+  return gfxMatrix();
+}
+
+// -------------------------------------------------------------------------
+// Helper functions
+// -------------------------------------------------------------------------
+
+/** Calculate the maximum expansion of a matrix */
+static float
+MaxExpansion(const Matrix &aMatrix)
+{
+  // maximum expansion derivation from
+  // http://lists.cairographics.org/archives/cairo/2004-October/001980.html
+  // and also implemented in cairo_matrix_transformed_circle_major_axis
+  double a = aMatrix._11;
+  double b = aMatrix._12;
+  double c = aMatrix._21;
+  double d = aMatrix._22;
+  double f = (a * a + b * b + c * c + d * d) / 2;
+  double g = (a * a + b * b - c * c - d * d) / 2;
+  double h = a * c + b * d;
+  return sqrt(f + sqrt(g * g + h * h));
+}
+
+// The SVG specification says that the 'patternContentUnits' attribute "has no effect if
+// attribute ‘viewBox’ is specified". We still need to include a bbox scale
+// if the viewBox is specified and _patternUnits_ is set to or defaults to
+// objectBoundingBox though, since in that case the viewBox is relative to the bbox
+static bool
+IncludeBBoxScale(const nsSVGViewBox& aViewBox,
+                 uint32_t aPatternContentUnits, uint32_t aPatternUnits)
+{
+  return (!aViewBox.IsExplicitlySet() &&
+          aPatternContentUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) ||
+         (aViewBox.IsExplicitlySet() &&
+          aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
+}
+
+// Given the matrix for the pattern element's own transform, this returns a
+// combined matrix including the transforms applicable to its target.
+static Matrix
+GetPatternMatrix(uint16_t aPatternUnits,
+                 const Matrix &patternTransform,
+                 const gfxRect &bbox,
+                 const gfxRect &callerBBox,
+                 const Matrix &callerCTM)
+{
+  // We really want the pattern matrix to handle translations
+  gfxFloat minx = bbox.X();
+  gfxFloat miny = bbox.Y();
+
+  if (aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
+    minx += callerBBox.X();
+    miny += callerBBox.Y();
+  }
+
+  float scale = 1.0f / MaxExpansion(callerCTM);
+  Matrix patternMatrix = patternTransform;
+  patternMatrix.PreScale(scale, scale);
+  patternMatrix.PreTranslate(minx, miny);
+
+  return patternMatrix;
+}
+
+static nsresult
+GetTargetGeometry(gfxRect *aBBox,
+                  const nsSVGViewBox &aViewBox,
+                  uint16_t aPatternContentUnits,
+                  uint16_t aPatternUnits,
+                  nsIFrame *aTarget,
+                  const Matrix &aContextMatrix,
+                  const gfxRect *aOverrideBounds)
+{
+  *aBBox = aOverrideBounds ? *aOverrideBounds : nsSVGUtils::GetBBox(aTarget);
+
+  // Sanity check
+  if (IncludeBBoxScale(aViewBox, aPatternContentUnits, aPatternUnits) &&
+      (aBBox->Width() <= 0 || aBBox->Height() <= 0)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // OK, now fix up the bounding box to reflect user coordinates
+  // We handle device unit scaling in pattern matrix
+  float scale = MaxExpansion(aContextMatrix);
+  if (scale <= 0) {
+    return NS_ERROR_FAILURE;
+  }
+  aBBox->Scale(scale);
+  return NS_OK;
+}
+
+already_AddRefed<SourceSurface>
+nsSVGPatternFrame::PaintPattern(const DrawTarget* aDrawTarget,
+                                Matrix* patternMatrix,
+                                const Matrix &aContextMatrix,
+                                nsIFrame *aSource,
+                                nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
+                                float aGraphicOpacity,
+                                const gfxRect *aOverrideBounds)
+{
+  /*
+   * General approach:
+   *    Set the content geometry stuff
+   *    Calculate our bbox (using x,y,width,height & patternUnits &
+   *                        patternTransform)
+   *    Create the surface
+   *    Calculate the content transformation matrix
+   *    Get our children (we may need to get them from another Pattern)
+   *    Call SVGPaint on all of our children
+   *    Return
+   */
+
+  nsSVGPatternFrame* patternWithChildren = GetPatternWithChildren();
+  if (!patternWithChildren) {
+    return nullptr; // Either no kids or a bad reference
+  }
+  nsIFrame* firstKid = patternWithChildren->mFrames.FirstChild();
+
+  const nsSVGViewBox& viewBox = GetViewBox();
+
+  uint16_t patternContentUnits =
+    GetEnumValue(SVGPatternElement::PATTERNCONTENTUNITS);
+  uint16_t patternUnits =
+    GetEnumValue(SVGPatternElement::PATTERNUNITS);
+
+  /*
+   * Get the content geometry information.  This is a little tricky --
+   * our parent is probably a <defs>, but we are rendering in the context
+   * of some geometry source.  Our content geometry information needs to
+   * come from our rendering parent as opposed to our content parent.  We
+   * get that information from aSource, which is passed to us from the
+   * backend renderer.
+   *
+   * There are three "geometries" that we need:
+   *   1) The bounding box for the pattern.  We use this to get the
+   *      width and height for the surface, and as the return to
+   *      GetBBox.
+   *   2) The transformation matrix for the pattern.  This is not *quite*
+   *      the same as the canvas transformation matrix that we will
+   *      provide to our rendering children since we "fudge" it a little
+   *      to get the renderer to handle the translations correctly for us.
+   *   3) The CTM that we return to our children who make up the pattern.
+   */
+
+  // Get all of the information we need from our "caller" -- i.e.
+  // the geometry that is being rendered with a pattern
+  gfxRect callerBBox;
+  if (NS_FAILED(GetTargetGeometry(&callerBBox,
+                                  viewBox,
+                                  patternContentUnits, patternUnits,
+                                  aSource,
+                                  aContextMatrix,
+                                  aOverrideBounds))) {
+    return nullptr;
+  }
+
+  // Construct the CTM that we will provide to our children when we
+  // render them into the tile.
+  gfxMatrix ctm = ConstructCTM(viewBox, patternContentUnits, patternUnits,
+                               callerBBox, aContextMatrix, aSource);
+  if (ctm.IsSingular()) {
+    return nullptr;
+  }
+
+  if (patternWithChildren->mCTM) {
+    *patternWithChildren->mCTM = ctm;
+  } else {
+    patternWithChildren->mCTM = new gfxMatrix(ctm);
+  }
+
+  // Get the bounding box of the pattern.  This will be used to determine
+  // the size of the surface, and will also be used to define the bounding
+  // box for the pattern tile.
+  gfxRect bbox = GetPatternRect(patternUnits, callerBBox, aContextMatrix, aSource);
+  if (bbox.Width() <= 0.0 || bbox.Height() <= 0.0) {
+    return nullptr;
+  }
+
+  // Get the pattern transform
+  Matrix patternTransform = ToMatrix(GetPatternTransform());
+
+  // revert the vector effect transform so that the pattern appears unchanged
+  if (aFillOrStroke == &nsStyleSVG::mStroke) {
+    gfxMatrix userToOuterSVG;
+    if (nsSVGUtils::GetNonScalingStrokeTransform(aSource, &userToOuterSVG)) {
+      patternTransform *= ToMatrix(userToOuterSVG);
+      if (patternTransform.IsSingular()) {
+        NS_WARNING("Singular matrix painting non-scaling-stroke");
+        return nullptr;
+      }
+    }
+  }
+
+  // Get the transformation matrix that we will hand to the renderer's pattern
+  // routine.
+  *patternMatrix = GetPatternMatrix(patternUnits, patternTransform,
+                                    bbox, callerBBox, aContextMatrix);
+  if (patternMatrix->IsSingular()) {
+    return nullptr;
+  }
+
+  // Now that we have all of the necessary geometries, we can
+  // create our surface.
+  gfxRect transformedBBox = ThebesRect(patternTransform.TransformBounds(ToRect(bbox)));
+
+  bool resultOverflows;
+  IntSize surfaceSize =
+    nsSVGUtils::ConvertToSurfaceSize(
+      transformedBBox.Size(), &resultOverflows);
+
+  // 0 disables rendering, < 0 is an error
+  if (surfaceSize.width <= 0 || surfaceSize.height <= 0) {
+    return nullptr;
+  }
+
+  gfxFloat patternWidth = bbox.Width();
+  gfxFloat patternHeight = bbox.Height();
+
+  if (resultOverflows ||
+      patternWidth != surfaceSize.width ||
+      patternHeight != surfaceSize.height) {
+    // scale drawing to pattern surface size
+    gfxMatrix tempTM =
+      gfxMatrix(surfaceSize.width / patternWidth, 0.0,
+                0.0, surfaceSize.height / patternHeight,
+                0.0, 0.0);
+    patternWithChildren->mCTM->PreMultiply(tempTM);
+
+    // and rescale pattern to compensate
+    patternMatrix->PreScale(patternWidth / surfaceSize.width,
+                            patternHeight / surfaceSize.height);
+  }
+
+  RefPtr<DrawTarget> dt =
+    aDrawTarget->CreateSimilarDrawTarget(surfaceSize, SurfaceFormat::B8G8R8A8);
+  if (!dt || !dt->IsValid()) {
+    return nullptr;
+  }
+  dt->ClearRect(Rect(0, 0, surfaceSize.width, surfaceSize.height));
+
+  RefPtr<gfxContext> gfx = gfxContext::CreateOrNull(dt);
+  MOZ_ASSERT(gfx); // already checked the draw target above
+
+  if (aGraphicOpacity != 1.0f) {
+    gfx->Save();
+    gfx->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, aGraphicOpacity);
+  }
+
+  // OK, now render -- note that we use "firstKid", which
+  // we got at the beginning because it takes care of the
+  // referenced pattern situation for us
+
+  if (aSource->IsFrameOfType(nsIFrame::eSVGGeometry)) {
+    // Set the geometrical parent of the pattern we are rendering
+    patternWithChildren->mSource = static_cast<nsSVGPathGeometryFrame*>(aSource);
+  }
+
+  // Delay checking NS_FRAME_DRAWING_AS_PAINTSERVER bit until here so we can
+  // give back a clear surface if there's a loop
+  if (!(patternWithChildren->GetStateBits() & NS_FRAME_DRAWING_AS_PAINTSERVER)) {
+    patternWithChildren->AddStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
+    for (nsIFrame* kid = firstKid; kid;
+         kid = kid->GetNextSibling()) {
+      // The CTM of each frame referencing us can be different
+      nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
+      if (SVGFrame) {
+        SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
+      }
+      gfxMatrix tm = *(patternWithChildren->mCTM);
+      if (kid->GetContent()->IsSVGElement()) {
+        tm = static_cast<nsSVGElement*>(kid->GetContent())->
+               PrependLocalTransformsTo(tm, eUserSpaceToParent);
+      }
+      Unused << nsSVGUtils::PaintFrameWithEffects(kid, *gfx, tm);
+    }
+    patternWithChildren->RemoveStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER);
+  }
+
+  patternWithChildren->mSource = nullptr;
+
+  if (aGraphicOpacity != 1.0f) {
+    gfx->PopGroupAndBlend();
+    gfx->Restore();
+  }
+
+  // caller now owns the surface
+  return dt->Snapshot();
+}
+
+/* Will probably need something like this... */
+// How do we handle the insertion of a new frame?
+// We really don't want to rerender this every time,
+// do we?
+nsSVGPatternFrame*
+nsSVGPatternFrame::GetPatternWithChildren()
+{
+  // Do we have any children ourselves?
+  if (!mFrames.IsEmpty())
+    return this;
+
+  // No, see if we chain to someone who does
+  AutoPatternReferencer patternRef(this);
+
+  nsSVGPatternFrame* next = GetReferencedPatternIfNotInUse();
+  if (!next)
+    return nullptr;
+
+  return next->GetPatternWithChildren();
+}
+
+uint16_t
+nsSVGPatternFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
+{
+  nsSVGEnum& thisEnum =
+    static_cast<SVGPatternElement *>(mContent)->mEnumAttributes[aIndex];
+
+  if (thisEnum.IsExplicitlySet())
+    return thisEnum.GetAnimValue();
+
+  AutoPatternReferencer patternRef(this);
+
+  nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
+  return next ? next->GetEnumValue(aIndex, aDefault) :
+    static_cast<SVGPatternElement *>(aDefault)->
+      mEnumAttributes[aIndex].GetAnimValue();
+}
+
+nsSVGAnimatedTransformList*
+nsSVGPatternFrame::GetPatternTransformList(nsIContent* aDefault)
+{
+  nsSVGAnimatedTransformList *thisTransformList =
+    static_cast<SVGPatternElement *>(mContent)->GetAnimatedTransformList();
+
+  if (thisTransformList && thisTransformList->IsExplicitlySet())
+    return thisTransformList;
+
+  AutoPatternReferencer patternRef(this);
+
+  nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
+  return next ? next->GetPatternTransformList(aDefault) :
+    static_cast<SVGPatternElement *>(aDefault)->mPatternTransform.get();
+}
+
+gfxMatrix
+nsSVGPatternFrame::GetPatternTransform()
+{
+  nsSVGAnimatedTransformList* animTransformList =
+    GetPatternTransformList(mContent);
+  if (!animTransformList)
+    return gfxMatrix();
+
+  return animTransformList->GetAnimValue().GetConsolidationMatrix();
+}
+
+const nsSVGViewBox &
+nsSVGPatternFrame::GetViewBox(nsIContent* aDefault)
+{
+  const nsSVGViewBox &thisViewBox =
+    static_cast<SVGPatternElement *>(mContent)->mViewBox;
+
+  if (thisViewBox.IsExplicitlySet())
+    return thisViewBox;
+
+  AutoPatternReferencer patternRef(this);
+
+  nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
+  return next ? next->GetViewBox(aDefault) :
+    static_cast<SVGPatternElement *>(aDefault)->mViewBox;
+}
+
+const SVGAnimatedPreserveAspectRatio &
+nsSVGPatternFrame::GetPreserveAspectRatio(nsIContent *aDefault)
+{
+  const SVGAnimatedPreserveAspectRatio &thisPar =
+    static_cast<SVGPatternElement *>(mContent)->mPreserveAspectRatio;
+
+  if (thisPar.IsExplicitlySet())
+    return thisPar;
+
+  AutoPatternReferencer patternRef(this);
+
+  nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
+  return next ? next->GetPreserveAspectRatio(aDefault) :
+    static_cast<SVGPatternElement *>(aDefault)->mPreserveAspectRatio;
+}
+
+const nsSVGLength2 *
+nsSVGPatternFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
+{
+  const nsSVGLength2 *thisLength =
+    &static_cast<SVGPatternElement *>(mContent)->mLengthAttributes[aIndex];
+
+  if (thisLength->IsExplicitlySet())
+    return thisLength;
+
+  AutoPatternReferencer patternRef(this);
+
+  nsSVGPatternFrame *next = GetReferencedPatternIfNotInUse();
+  return next ? next->GetLengthValue(aIndex, aDefault) :
+    &static_cast<SVGPatternElement *>(aDefault)->mLengthAttributes[aIndex];
+}
+
+// Private (helper) methods
+nsSVGPatternFrame *
+nsSVGPatternFrame::GetReferencedPattern()
+{
+  if (mNoHRefURI)
+    return nullptr;
+
+  nsSVGPaintingProperty *property =
+    Properties().Get(nsSVGEffects::HrefAsPaintingProperty());
+
+  if (!property) {
+    // Fetch our pattern element's href or xlink:href attribute
+    SVGPatternElement *pattern = static_cast<SVGPatternElement *>(mContent);
+    nsAutoString href;
+    if (pattern->mStringAttributes[SVGPatternElement::HREF].IsExplicitlySet()) {
+      pattern->mStringAttributes[SVGPatternElement::HREF]
+        .GetAnimValue(href, pattern);
+    } else {
+      pattern->mStringAttributes[SVGPatternElement::XLINK_HREF]
+        .GetAnimValue(href, pattern);
+    }
+
+    if (href.IsEmpty()) {
+      mNoHRefURI = true;
+      return nullptr; // no URL
+    }
+
+    // Convert href to an nsIURI
+    nsCOMPtr<nsIURI> targetURI;
+    nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
+    nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
+                                              mContent->GetUncomposedDoc(), base);
+
+    property =
+      nsSVGEffects::GetPaintingProperty(targetURI, this,
+                                        nsSVGEffects::HrefAsPaintingProperty());
+    if (!property)
+      return nullptr;
+  }
+
+  nsIFrame *result = property->GetReferencedFrame();
+  if (!result)
+    return nullptr;
+
+  nsIAtom* frameType = result->GetType();
+  if (frameType != nsGkAtoms::svgPatternFrame)
+    return nullptr;
+
+  return static_cast<nsSVGPatternFrame*>(result);
+}
+
+nsSVGPatternFrame *
+nsSVGPatternFrame::GetReferencedPatternIfNotInUse()
+{
+  nsSVGPatternFrame *referenced = GetReferencedPattern();
+  if (!referenced)
+    return nullptr;
+
+  if (referenced->mLoopFlag) {
+    // XXXjwatt: we should really send an error to the JavaScript Console here:
+    NS_WARNING("pattern reference loop detected while inheriting attribute!");
+    return nullptr;
+  }
+
+  return referenced;
+}
+
+gfxRect
+nsSVGPatternFrame::GetPatternRect(uint16_t aPatternUnits,
+                                  const gfxRect &aTargetBBox,
+                                  const Matrix &aTargetCTM,
+                                  nsIFrame *aTarget)
+{
+  // We need to initialize our box
+  float x,y,width,height;
+
+  // Get the pattern x,y,width, and height
+  const nsSVGLength2 *tmpX, *tmpY, *tmpHeight, *tmpWidth;
+  tmpX = GetLengthValue(SVGPatternElement::ATTR_X);
+  tmpY = GetLengthValue(SVGPatternElement::ATTR_Y);
+  tmpHeight = GetLengthValue(SVGPatternElement::ATTR_HEIGHT);
+  tmpWidth = GetLengthValue(SVGPatternElement::ATTR_WIDTH);
+
+  if (aPatternUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
+    x = nsSVGUtils::ObjectSpace(aTargetBBox, tmpX);
+    y = nsSVGUtils::ObjectSpace(aTargetBBox, tmpY);
+    width = nsSVGUtils::ObjectSpace(aTargetBBox, tmpWidth);
+    height = nsSVGUtils::ObjectSpace(aTargetBBox, tmpHeight);
+  } else {
+    float scale = MaxExpansion(aTargetCTM);
+    x = nsSVGUtils::UserSpace(aTarget, tmpX) * scale;
+    y = nsSVGUtils::UserSpace(aTarget, tmpY) * scale;
+    width = nsSVGUtils::UserSpace(aTarget, tmpWidth) * scale;
+    height = nsSVGUtils::UserSpace(aTarget, tmpHeight) * scale;
+  }
+
+  return gfxRect(x, y, width, height);
+}
+
+gfxMatrix
+nsSVGPatternFrame::ConstructCTM(const nsSVGViewBox& aViewBox,
+                                uint16_t aPatternContentUnits,
+                                uint16_t aPatternUnits,
+                                const gfxRect &callerBBox,
+                                const Matrix &callerCTM,
+                                nsIFrame *aTarget)
+{
+  SVGSVGElement *ctx = nullptr;
+  nsIContent* targetContent = aTarget->GetContent();
+  gfxFloat scaleX, scaleY;
+
+  // The objectBoundingBox conversion must be handled in the CTM:
+  if (IncludeBBoxScale(aViewBox, aPatternContentUnits, aPatternUnits)) {
+    scaleX = callerBBox.Width();
+    scaleY = callerBBox.Height();
+  } else {
+    if (targetContent->IsSVGElement()) {
+      ctx = static_cast<nsSVGElement*>(targetContent)->GetCtx();
+    }
+    scaleX = scaleY = MaxExpansion(callerCTM);
+  }
+
+  if (!aViewBox.IsExplicitlySet()) {
+    return gfxMatrix(scaleX, 0.0, 0.0, scaleY, 0.0, 0.0);
+  }
+  const nsSVGViewBoxRect viewBoxRect = aViewBox.GetAnimValue();
+
+  if (viewBoxRect.height <= 0.0f || viewBoxRect.width <= 0.0f) {
+    return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
+  }
+
+  float viewportWidth, viewportHeight;
+  if (targetContent->IsSVGElement()) {
+    // If we're dealing with an SVG target only retrieve the context once.
+    // Calling the nsIFrame* variant of GetAnimValue would look it up on
+    // every call.
+    viewportWidth =
+      GetLengthValue(SVGPatternElement::ATTR_WIDTH)->GetAnimValue(ctx);
+    viewportHeight =
+      GetLengthValue(SVGPatternElement::ATTR_HEIGHT)->GetAnimValue(ctx);
+  } else {
+    // No SVG target, call the nsIFrame* variant of GetAnimValue.
+    viewportWidth =
+      GetLengthValue(SVGPatternElement::ATTR_WIDTH)->GetAnimValue(aTarget);
+    viewportHeight =
+      GetLengthValue(SVGPatternElement::ATTR_HEIGHT)->GetAnimValue(aTarget);
+  }
+
+  if (viewportWidth <= 0.0f || viewportHeight <= 0.0f) {
+    return gfxMatrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
+  }
+
+  Matrix tm = SVGContentUtils::GetViewBoxTransform(
+    viewportWidth * scaleX, viewportHeight * scaleY,
+    viewBoxRect.x, viewBoxRect.y,
+    viewBoxRect.width, viewBoxRect.height,
+    GetPreserveAspectRatio());
+
+  return ThebesMatrix(tm);
+}
+
+//----------------------------------------------------------------------
+// nsSVGPaintServerFrame methods:
+
+already_AddRefed<gfxPattern>
+nsSVGPatternFrame::GetPaintServerPattern(nsIFrame *aSource,
+                                         const DrawTarget* aDrawTarget,
+                                         const gfxMatrix& aContextMatrix,
+                                         nsStyleSVGPaint nsStyleSVG::*aFillOrStroke,
+                                         float aGraphicOpacity,
+                                         const gfxRect *aOverrideBounds)
+{
+  if (aGraphicOpacity == 0.0f) {
+    RefPtr<gfxPattern> pattern = new gfxPattern(Color());
+    return pattern.forget();
+  }
+
+  // Paint it!
+  Matrix pMatrix;
+  RefPtr<SourceSurface> surface =
+    PaintPattern(aDrawTarget, &pMatrix, ToMatrix(aContextMatrix), aSource,
+                 aFillOrStroke, aGraphicOpacity, aOverrideBounds);
+
+  if (!surface) {
+    return nullptr;
+  }
+
+  RefPtr<gfxPattern> pattern = new gfxPattern(surface, pMatrix);
+
+  if (!pattern || pattern->CairoStatus())
+    return nullptr;
+
+  pattern->SetExtend(ExtendMode::REPEAT);
+  return pattern.forget();
+}
+
+// -------------------------------------------------------------------------
+// Public functions
+// -------------------------------------------------------------------------
+
+nsIFrame* NS_NewSVGPatternFrame(nsIPresShell*   aPresShell,
+                                nsStyleContext* aContext)
+{
+  return new (aPresShell) nsSVGPatternFrame(aContext);
+}
+