DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (777e60ca8853)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327
/* -*- 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 "nsSVGClipPathFrame.h"

// Keep others in (case-insensitive) order:
#include "gfxContext.h"
#include "nsGkAtoms.h"
#include "nsRenderingContext.h"
#include "mozilla/dom/SVGClipPathElement.h"
#include "nsSVGEffects.h"
#include "nsSVGUtils.h"

using namespace mozilla::dom;

//----------------------------------------------------------------------
// Implementation

nsIFrame*
NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsSVGClipPathFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsSVGClipPathFrame)

nsresult
nsSVGClipPathFrame::ClipPaint(nsRenderingContext* aContext,
                              nsIFrame* aParent,
                              const gfxMatrix &aMatrix)
{
  // If the flag is set when we get here, it means this clipPath frame
  // has already been used painting the current clip, and the document
  // has a clip reference loop.
  if (mInUse) {
    NS_WARNING("Clip loop detected!");
    return NS_OK;
  }
  AutoClipPathReferencer clipRef(this);

  mClipParent = aParent;
  if (mClipParentMatrix) {
    *mClipParentMatrix = aMatrix;
  } else {
    mClipParentMatrix = new gfxMatrix(aMatrix);
  }

  gfxContext *gfx = aContext->ThebesContext();

  nsISVGChildFrame *singleClipPathChild = nullptr;

  if (IsTrivial(&singleClipPathChild)) {
    // Notify our child that it's painting as part of a clipPath, and that
    // we only require it to draw its path (it should skip filling, etc.):
    SVGAutoRenderState mode(aContext, SVGAutoRenderState::CLIP);

    if (!singleClipPathChild) {
      // We have no children - the spec says clip away everything:
      gfx->Rectangle(gfxRect());
    } else {
      singleClipPathChild->NotifySVGChanged(
                             nsISVGChildFrame::TRANSFORM_CHANGED);
      singleClipPathChild->PaintSVG(aContext, nullptr);
    }
    gfx->Clip();
    gfx->NewPath();
    return NS_OK;
  }

  // Seems like this is a non-trivial clipPath, so we need to use a clip mask.

  // Notify our children that they're painting into a clip mask:
  SVGAutoRenderState mode(aContext, SVGAutoRenderState::CLIP_MASK);

  // Check if this clipPath is itself clipped by another clipPath:
  nsSVGClipPathFrame *clipPathFrame =
    nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr);
  bool referencedClipIsTrivial;
  if (clipPathFrame) {
    referencedClipIsTrivial = clipPathFrame->IsTrivial();
    gfx->Save();
    if (referencedClipIsTrivial) {
      clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
    } else {
      gfx->PushGroup(gfxContentType::ALPHA);
    }
  }

  for (nsIFrame* kid = mFrames.FirstChild(); kid;
       kid = kid->GetNextSibling()) {
    nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
    if (SVGFrame) {
      // The CTM of each frame referencing us can be different.
      SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);

      bool isOK = true;
      nsSVGClipPathFrame *clipPathFrame =
        nsSVGEffects::GetEffectProperties(kid).GetClipPathFrame(&isOK);
      if (!isOK) {
        continue;
      }

      bool isTrivial;

      if (clipPathFrame) {
        isTrivial = clipPathFrame->IsTrivial();
        gfx->Save();
        if (isTrivial) {
          clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
        } else {
          gfx->PushGroup(gfxContentType::ALPHA);
        }
      }

      SVGFrame->PaintSVG(aContext, nullptr);

      if (clipPathFrame) {
        if (!isTrivial) {
          gfx->PopGroupToSource();

          nsRefPtr<gfxPattern> clipMaskSurface;
          gfx->PushGroup(gfxContentType::ALPHA);

          clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
          clipMaskSurface = gfx->PopGroup();

          if (clipMaskSurface) {
            gfx->Mask(clipMaskSurface);
          }
        }
        gfx->Restore();
      }
    }
  }

  if (clipPathFrame) {
    if (!referencedClipIsTrivial) {
      gfx->PopGroupToSource();

      nsRefPtr<gfxPattern> clipMaskSurface;
      gfx->PushGroup(gfxContentType::ALPHA);

      clipPathFrame->ClipPaint(aContext, aParent, aMatrix);
      clipMaskSurface = gfx->PopGroup();

      if (clipMaskSurface) {
        gfx->Mask(clipMaskSurface);
      }
    }
    gfx->Restore();
  }

  return NS_OK;
}

bool
nsSVGClipPathFrame::ClipHitTest(nsIFrame* aParent,
                                const gfxMatrix &aMatrix,
                                const nsPoint &aPoint)
{
  // If the flag is set when we get here, it means this clipPath frame
  // has already been used in hit testing against the current clip,
  // and the document has a clip reference loop.
  if (mInUse) {
    NS_WARNING("Clip loop detected!");
    return false;
  }
  AutoClipPathReferencer clipRef(this);

  mClipParent = aParent;
  if (mClipParentMatrix) {
    *mClipParentMatrix = aMatrix;
  } else {
    mClipParentMatrix = new gfxMatrix(aMatrix);
  }

  nsSVGClipPathFrame *clipPathFrame =
    nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr);
  if (clipPathFrame && !clipPathFrame->ClipHitTest(aParent, aMatrix, aPoint))
    return false;

  for (nsIFrame* kid = mFrames.FirstChild(); kid;
       kid = kid->GetNextSibling()) {
    nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
    if (SVGFrame) {
      // Notify the child frame that we may be working with a
      // different transform, so it can update its covered region
      // (used to shortcut hit testing).
      SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);

      if (SVGFrame->GetFrameForPoint(aPoint))
        return true;
    }
  }
  return false;
}

bool
nsSVGClipPathFrame::IsTrivial(nsISVGChildFrame **aSingleChild)
{
  // If the clip path is clipped then it's non-trivial
  if (nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(nullptr))
    return false;

  if (aSingleChild) {
    *aSingleChild = nullptr;
  }

  nsISVGChildFrame *foundChild = nullptr;

  for (nsIFrame* kid = mFrames.FirstChild(); kid;
       kid = kid->GetNextSibling()) {
    nsISVGChildFrame *svgChild = do_QueryFrame(kid);
    if (svgChild) {
      // We consider a non-trivial clipPath to be one containing
      // either more than one svg child and/or a svg container
      if (foundChild || svgChild->IsDisplayContainer())
        return false;

      // or where the child is itself clipped
      if (nsSVGEffects::GetEffectProperties(kid).GetClipPathFrame(nullptr))
        return false;

      foundChild = svgChild;
    }
  }
  if (aSingleChild) {
    *aSingleChild = foundChild;
  }
  return true;
}

bool
nsSVGClipPathFrame::IsValid()
{
  if (mInUse) {
    NS_WARNING("Clip loop detected!");
    return false;
  }
  AutoClipPathReferencer clipRef(this);

  bool isOK = true;
  nsSVGEffects::GetEffectProperties(this).GetClipPathFrame(&isOK);
  if (!isOK) {
    return false;
  }

  for (nsIFrame* kid = mFrames.FirstChild(); kid;
       kid = kid->GetNextSibling()) {

    nsIAtom *type = kid->GetType();

    if (type == nsGkAtoms::svgUseFrame) {
      for (nsIFrame* grandKid = kid->GetFirstPrincipalChild(); grandKid;
           grandKid = grandKid->GetNextSibling()) {

        nsIAtom *type = grandKid->GetType();

        if (type != nsGkAtoms::svgPathGeometryFrame &&
            type != nsGkAtoms::svgTextFrame) {
          return false;
        }
      }
      continue;
    }
    if (type != nsGkAtoms::svgPathGeometryFrame &&
        type != nsGkAtoms::svgTextFrame) {
      return false;
    }
  }
  return true;
}

nsresult
nsSVGClipPathFrame::AttributeChanged(int32_t         aNameSpaceID,
                                     nsIAtom*        aAttribute,
                                     int32_t         aModType)
{
  if (aNameSpaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::transform) {
      nsSVGEffects::InvalidateDirectRenderingObservers(this);
      nsSVGUtils::NotifyChildrenOfSVGChange(this,
                                            nsISVGChildFrame::TRANSFORM_CHANGED);
    }
    if (aAttribute == nsGkAtoms::clipPathUnits) {
      nsSVGEffects::InvalidateRenderingObservers(this);
    }
  }

  return nsSVGClipPathFrameBase::AttributeChanged(aNameSpaceID,
                                                  aAttribute, aModType);
}

void
nsSVGClipPathFrame::Init(nsIContent* aContent,
                         nsIFrame* aParent,
                         nsIFrame* aPrevInFlow)
{
  NS_ASSERTION(aContent->IsSVG(nsGkAtoms::clipPath),
               "Content is not an SVG clipPath!");

  AddStateBits(NS_STATE_SVG_CLIPPATH_CHILD);
  nsSVGClipPathFrameBase::Init(aContent, aParent, aPrevInFlow);
}

nsIAtom *
nsSVGClipPathFrame::GetType() const
{
  return nsGkAtoms::svgClipPathFrame;
}

gfxMatrix
nsSVGClipPathFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
{
  SVGClipPathElement *content = static_cast<SVGClipPathElement*>(mContent);

  gfxMatrix tm =
    content->PrependLocalTransformsTo(mClipParentMatrix ?
                                      *mClipParentMatrix : gfxMatrix());

  return nsSVGUtils::AdjustMatrixForUnits(tm,
                                          &content->mEnumAttributes[SVGClipPathElement::CLIPPATHUNITS],
                                          mClipParent);
}