Introduce SVGPaintServer

Source/core/rendering/svg/RenderSVGResourceGradient.cpp

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * 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.
  */
 
 #include "config.h"
-
 #include "core/rendering/svg/RenderSVGResourceGradient.h"
 
-#include "core/rendering/svg/RenderSVGShape.h"
-#include "core/rendering/svg/SVGRenderSupport.h"
-#include "platform/graphics/GraphicsContext.h"
+#include "core/paint/SVGPaintServer.h"
 
 namespace blink {
 
 RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement* node)
     : RenderSVGResourceContainer(node)
     , m_shouldCollectGradientAttributes(true)
 {
 }
 
 void RenderSVGResourceGradient::removeAllClientsFromCache(bool markForInvalidation)
 {
     m_gradientMap.clear();
     m_shouldCollectGradientAttributes = true;
     markAllClientsForInvalidation(markForInvalidation ? PaintInvalidation : ParentOnlyInvalidation);
 }
 
 void RenderSVGResourceGradient::removeClientFromCache(RenderObject* client, bool markForInvalidation)
 {
     ASSERT(client);
     m_gradientMap.remove(client);
     markClientForInvalidation(client, markForInvalidation ? PaintInvalidation : ParentOnlyInvalidation);
 }
 
-bool RenderSVGResourceGradient::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext* context, RenderSVGResourceModeFlags resourceMode)
+PassOwnPtr<SVGPaintServer> RenderSVGResourceGradient::preparePaintServer(RenderObject* object, RenderStyle* style, RenderSVGResourceModeFlags resourceMode)
 {
     ASSERT(object);
     ASSERT(style);
-    ASSERT(context);
 
     clearInvalidationMask();
 
     // Be sure to synchronize all SVG properties on the gradientElement _before_ processing any further.
     // Otherwhise the call to collectGradientAttributes() in createTileImage(), may cause the SVG DOM property
     // synchronization to kick in, which causes removeAllClientsFromCache() to be called, which in turn deletes our
     // GradientData object! Leaving out the line below will cause svg/dynamic-updates/SVG*GradientElement-svgdom* to crash.
     SVGGradientElement* gradientElement = toSVGGradientElement(element());
     if (!gradientElement)
-        return false;
+        return nullptr;
 
     if (m_shouldCollectGradientAttributes) {
         gradientElement->synchronizeAnimatedSVGAttribute(anyQName());
         if (!collectGradientAttributes(gradientElement))
-            return false;
+            return nullptr;
 
         m_shouldCollectGradientAttributes = false;
     }
 
     // Spec: When the geometry of the applicable element has no width or height and objectBoundingBox is specified,
     // then the given effect (e.g. a gradient or a filter) will be ignored.
     FloatRect objectBoundingBox = object->objectBoundingBox();
     if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
-        return false;
+        return nullptr;
 
     OwnPtr<GradientData>& gradientData = m_gradientMap.add(object, nullptr).storedValue->value;
     if (!gradientData)
         gradientData = adoptPtr(new GradientData);
 
     // Create gradient object
     if (!gradientData->gradient) {
         buildGradient(gradientData.get());
 
         // We want the text bounding box applied to the gradient space transform now, so the gradient shader can use it.
         if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && !objectBoundingBox.isEmpty()) {
             gradientData->userspaceTransform.translate(objectBoundingBox.x(), objectBoundingBox.y());
             gradientData->userspaceTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         }
 
         AffineTransform gradientTransform;
         calculateGradientTransform(gradientTransform);
 
         gradientData->userspaceTransform *= gradientTransform;
     }
 
     if (!gradientData->gradient)
-        return false;
+        return nullptr;
 
     const SVGRenderStyle& svgStyle = style->svgStyle();
 
     AffineTransform computedGradientSpaceTransform = computeResourceSpaceTransform(object, gradientData->userspaceTransform, svgStyle, resourceMode);
     gradientData->gradient->setGradientSpaceTransform(computedGradientSpaceTransform);
 
-    // Draw gradient
-    context->save();
-
-    if (resourceMode & ApplyToFillMode)
-        context->setFillGradient(gradientData->gradient);
-    else if (resourceMode & ApplyToStrokeMode)
-        context->setStrokeGradient(gradientData->gradient);
-
-    updateGraphicsContext(context, style, *object, resourceMode);
-    return true;
-}
-
-void RenderSVGResourceGradient::postApplyResource(GraphicsContext* context)
-{
-    ASSERT(context);
-    context->restore();
+    return adoptPtr(new SVGPaintServer(gradientData->gradient));
 }
 
 bool RenderSVGResourceGradient::isChildAllowed(RenderObject* child, RenderStyle*) const
 {
     if (child->isSVGGradientStop())
         return true;
 
     if (!child->isSVGResourceContainer())
         return false;
 
@@ skipping 22 matching lines @@
         return SpreadMethodReflect;
     case SVGSpreadMethodRepeat:
         return SpreadMethodRepeat;
     }
 
     ASSERT_NOT_REACHED();
     return SpreadMethodPad;
 }
 
 }