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      1 /*
      2  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2008 Eric Seidel <eric (at) webkit.org>
      4  * Copyright (C) 2008 Dirk Schulze <krit (at) webkit.org>
      5  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #include "config.h"
     24 
     25 #include "core/rendering/svg/RenderSVGResourceGradient.h"
     26 
     27 #include "core/rendering/svg/RenderSVGShape.h"
     28 #include "core/rendering/svg/SVGRenderSupport.h"
     29 #include "platform/graphics/GraphicsContext.h"
     30 
     31 namespace WebCore {
     32 
     33 RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement* node)
     34     : RenderSVGResourceContainer(node)
     35     , m_shouldCollectGradientAttributes(true)
     36 {
     37 }
     38 
     39 void RenderSVGResourceGradient::removeAllClientsFromCache(bool markForInvalidation)
     40 {
     41     m_gradientMap.clear();
     42     m_shouldCollectGradientAttributes = true;
     43     markAllClientsForInvalidation(markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation);
     44 }
     45 
     46 void RenderSVGResourceGradient::removeClientFromCache(RenderObject* client, bool markForInvalidation)
     47 {
     48     ASSERT(client);
     49     m_gradientMap.remove(client);
     50     markClientForInvalidation(client, markForInvalidation ? RepaintInvalidation : ParentOnlyInvalidation);
     51 }
     52 
     53 bool RenderSVGResourceGradient::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext*& context, unsigned short resourceMode)
     54 {
     55     ASSERT(object);
     56     ASSERT(style);
     57     ASSERT(context);
     58     ASSERT(resourceMode != ApplyToDefaultMode);
     59 
     60     clearInvalidationMask();
     61 
     62     // Be sure to synchronize all SVG properties on the gradientElement _before_ processing any further.
     63     // Otherwhise the call to collectGradientAttributes() in createTileImage(), may cause the SVG DOM property
     64     // synchronization to kick in, which causes removeAllClientsFromCache() to be called, which in turn deletes our
     65     // GradientData object! Leaving out the line below will cause svg/dynamic-updates/SVG*GradientElement-svgdom* to crash.
     66     SVGGradientElement* gradientElement = toSVGGradientElement(element());
     67     if (!gradientElement)
     68         return false;
     69 
     70     if (m_shouldCollectGradientAttributes) {
     71         gradientElement->synchronizeAnimatedSVGAttribute(anyQName());
     72         if (!collectGradientAttributes(gradientElement))
     73             return false;
     74 
     75         m_shouldCollectGradientAttributes = false;
     76     }
     77 
     78     // Spec: When the geometry of the applicable element has no width or height and objectBoundingBox is specified,
     79     // then the given effect (e.g. a gradient or a filter) will be ignored.
     80     FloatRect objectBoundingBox = object->objectBoundingBox();
     81     if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && objectBoundingBox.isEmpty())
     82         return false;
     83 
     84     OwnPtr<GradientData>& gradientData = m_gradientMap.add(object, nullptr).iterator->value;
     85     if (!gradientData)
     86         gradientData = adoptPtr(new GradientData);
     87 
     88     bool isPaintingText = resourceMode & ApplyToTextMode;
     89 
     90     // Create gradient object
     91     if (!gradientData->gradient) {
     92         buildGradient(gradientData.get());
     93 
     94         // We want the text bounding box applied to the gradient space transform now, so the gradient shader can use it.
     95         if (gradientUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX && !objectBoundingBox.isEmpty()) {
     96             gradientData->userspaceTransform.translate(objectBoundingBox.x(), objectBoundingBox.y());
     97             gradientData->userspaceTransform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
     98         }
     99 
    100         AffineTransform gradientTransform;
    101         calculateGradientTransform(gradientTransform);
    102 
    103         gradientData->userspaceTransform *= gradientTransform;
    104         if (isPaintingText) {
    105             // Depending on font scaling factor, we may need to rescale the gradient here since
    106             // text painting removes the scale factor from the context.
    107             AffineTransform additionalTextTransform;
    108             if (shouldTransformOnTextPainting(object, additionalTextTransform))
    109                 gradientData->userspaceTransform *= additionalTextTransform;
    110         }
    111         gradientData->gradient->setGradientSpaceTransform(gradientData->userspaceTransform);
    112     }
    113 
    114     if (!gradientData->gradient)
    115         return false;
    116 
    117     // Draw gradient
    118     context->save();
    119 
    120     if (isPaintingText)
    121         context->setTextDrawingMode(resourceMode & ApplyToFillMode ? TextModeFill : TextModeStroke);
    122 
    123     const SVGRenderStyle* svgStyle = style->svgStyle();
    124     ASSERT(svgStyle);
    125 
    126     if (resourceMode & ApplyToFillMode) {
    127         context->setAlpha(svgStyle->fillOpacity());
    128         context->setFillGradient(gradientData->gradient);
    129         context->setFillRule(svgStyle->fillRule());
    130     } else if (resourceMode & ApplyToStrokeMode) {
    131         if (svgStyle->vectorEffect() == VE_NON_SCALING_STROKE)
    132             gradientData->gradient->setGradientSpaceTransform(transformOnNonScalingStroke(object, gradientData->userspaceTransform));
    133         context->setAlpha(svgStyle->strokeOpacity());
    134         context->setStrokeGradient(gradientData->gradient);
    135         SVGRenderSupport::applyStrokeStyleToContext(context, style, object);
    136     }
    137 
    138     return true;
    139 }
    140 
    141 void RenderSVGResourceGradient::postApplyResource(RenderObject*, GraphicsContext*& context, unsigned short resourceMode, const Path* path, const RenderSVGShape* shape)
    142 {
    143     ASSERT(context);
    144     ASSERT(resourceMode != ApplyToDefaultMode);
    145 
    146     if (resourceMode & ApplyToFillMode) {
    147         if (path)
    148             context->fillPath(*path);
    149         else if (shape)
    150             shape->fillShape(context);
    151     }
    152     if (resourceMode & ApplyToStrokeMode) {
    153         if (path)
    154             context->strokePath(*path);
    155         else if (shape)
    156             shape->strokeShape(context);
    157     }
    158 
    159     context->restore();
    160 }
    161 
    162 void RenderSVGResourceGradient::addStops(GradientData* gradientData, const Vector<Gradient::ColorStop>& stops) const
    163 {
    164     ASSERT(gradientData->gradient);
    165 
    166     const Vector<Gradient::ColorStop>::const_iterator end = stops.end();
    167     for (Vector<Gradient::ColorStop>::const_iterator it = stops.begin(); it != end; ++it)
    168         gradientData->gradient->addColorStop(*it);
    169 }
    170 
    171 GradientSpreadMethod RenderSVGResourceGradient::platformSpreadMethodFromSVGType(SVGSpreadMethodType method) const
    172 {
    173     switch (method) {
    174     case SVGSpreadMethodUnknown:
    175     case SVGSpreadMethodPad:
    176         return SpreadMethodPad;
    177     case SVGSpreadMethodReflect:
    178         return SpreadMethodReflect;
    179     case SVGSpreadMethodRepeat:
    180         return SpreadMethodRepeat;
    181     }
    182 
    183     ASSERT_NOT_REACHED();
    184     return SpreadMethodPad;
    185 }
    186 
    187 }
    188