Use transform paint property nodes in SVG [spv2]

third_party/WebKit/Source/core/paint/SVGPaintContext.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2012 Zoltan Herczeg <zherczeg@webkit.org>.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGPaintContext_h
 #define SVGPaintContext_h
 
 #include "core/layout/svg/LayoutSVGResourceClipper.h"
 #include "core/layout/svg/LayoutSVGResourcePaintServer.h"
+#include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/SVGClipPainter.h"
 #include "core/paint/SVGFilterPainter.h"
+#include "core/paint/TransformRecorder.h"
 #include "platform/graphics/paint/ClipPathRecorder.h"
 #include "platform/graphics/paint/CompositingRecorder.h"
+#include "platform/graphics/paint/ScopedPaintChunkProperties.h"
 #include "platform/transforms/AffineTransform.h"
 #include <memory>
 
 namespace blink {
 
 class LayoutObject;
 class LayoutSVGResourceFilter;
 class LayoutSVGResourceMasker;
 class SVGResources;
 
+// This class hooks up the correct paint property transform node when spv2 is enabled, and otherwise
+// works like a TransformRecorder which emits Transform display items for spv1.
+class SVGTransformContext : public TransformRecorder {
+    STACK_ALLOCATED();
+public:
+    SVGTransformContext(GraphicsContext& context, const LayoutObject& object, const AffineTransform& transform)
+        : TransformRecorder(context, object, transform)
+    {
+        if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+            const auto* objectProperties = object.objectPaintProperties();
+            if (!objectProperties)
+                return;
+            if (object.isSVGRoot()) {
+                // If a transform exists, we can rely on a layer existing to apply it.
+                DCHECK(!objectProperties || !objectProperties->transform() || object.hasLayer());
+                if (objectProperties->svgLocalToBorderBoxTransform()) {
+                    // FIXME(pdr): Enable the following DCHECK once the pixel snapping logic has
+                    // been included in svgLocalToBorderBox.
+                    // DCHECK(objectProperties->svgLocalToBorderBoxTransform()->matrix() == transform.toTransformationMatrix());
+                    auto& paintController = context.getPaintController();
+                    PaintChunkProperties properties(paintController.currentPaintChunkProperties());
+                    properties.transform = objectProperties->svgLocalToBorderBoxTransform();
+                    m_transformPropertyScope.emplace(paintController, properties);
+                }
+            } else {
+                DCHECK(object.isSVG());
+                // Should only be used by LayoutSVGRoot.
+                DCHECK(!objectProperties->svgLocalToBorderBoxTransform());
+
+                if (objectProperties->transform()) {
+                    DCHECK(objectProperties->transform()->matrix() == transform.toTransformationMatrix());
+                    auto& paintController = context.getPaintController();
+                    PaintChunkProperties properties(paintController.currentPaintChunkProperties());
+                    properties.transform = objectProperties->transform();
+                    m_transformPropertyScope.emplace(paintController, properties);
+                }
+            }
+        }
+    }
+private:
+    Optional<ScopedPaintChunkProperties> m_transformPropertyScope;
+};
+
 class SVGPaintContext {
     STACK_ALLOCATED();
 public:
     SVGPaintContext(const LayoutObject& object, const PaintInfo& paintInfo)
         : m_object(object)
         , m_paintInfo(paintInfo)
         , m_filter(nullptr)
         , m_clipper(nullptr)
         , m_clipperState(SVGClipPainter::ClipperNotApplied)
         , m_masker(nullptr)
@@ skipping 40 matching lines @@
     std::unique_ptr<ClipPathRecorder> m_clipPathRecorder;
     std::unique_ptr<SVGFilterRecordingContext> m_filterRecordingContext;
 #if ENABLE(ASSERT)
     bool m_applyClipMaskAndFilterIfNecessaryCalled;
 #endif
 };
 
 } // namespace blink
 
 #endif // SVGPaintContext_h