Move SVG shape painting code to SVGShapePainter

Source/core/paint/SVGShapePainter.cpp

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/paint/SVGShapePainter.h"
+
+#include "core/paint/ObjectPainter.h"
+#include "core/paint/SVGMarkerPainter.h"
+#include "core/rendering/GraphicsContextAnnotator.h"
+#include "core/rendering/PaintInfo.h"
+#include "core/rendering/svg/RenderSVGPath.h"
+#include "core/rendering/svg/RenderSVGShape.h"
+#include "core/rendering/svg/SVGMarkerData.h"
+#include "core/rendering/svg/SVGRenderSupport.h"
+#include "core/rendering/svg/SVGRenderingContext.h"
+#include "core/rendering/svg/SVGResources.h"
+#include "core/rendering/svg/SVGResourcesCache.h"
+
+namespace blink {
+
+static bool setupNonScalingStrokeContext(AffineTransform& strokeTransform, GraphicsContextStateSaver& stateSaver)
+{
+    if (!strokeTransform.isInvertible())
+        return false;
+
+    stateSaver.save();
+    stateSaver.context()->concatCTM(strokeTransform.inverse());
+    return true;
+}
+
+static void useStrokeStyleToFill(GraphicsContext* context)
+{
+    if (Gradient* gradient = context->strokeGradient())
+        context->setFillGradient(gradient);
+    else if (Pattern* pattern = context->strokePattern())
+        context->setFillPattern(pattern);
+    else
+        context->setFillColor(context->strokeColor());
+}
+
+void SVGShapePainter::paint(PaintInfo& paintInfo)
+{
+    ANNOTATE_GRAPHICS_CONTEXT(paintInfo, &m_renderSVGShape);
+    if (paintInfo.phase != PaintPhaseForeground
+        || m_renderSVGShape.style()->visibility() == HIDDEN
+        || m_renderSVGShape.isShapeEmpty())
+        return;
+
+    FloatRect boundingBox = m_renderSVGShape.paintInvalidationRectInLocalCoordinates();
+    if (!SVGRenderSupport::paintInfoIntersectsPaintInvalidationRect(boundingBox, m_renderSVGShape.localTransform(), paintInfo))
+        return;
+
+    PaintInfo childPaintInfo(paintInfo);
+
+    GraphicsContextStateSaver stateSaver(*childPaintInfo.context);
+    childPaintInfo.applyTransform(m_renderSVGShape.localTransform());
+
+    SVGRenderingContext renderingContext(&m_renderSVGShape, childPaintInfo);
+
+    if (renderingContext.isRenderingPrepared()) {
+        const SVGRenderStyle& svgStyle = m_renderSVGShape.style()->svgStyle();
+        if (svgStyle.shapeRendering() == SR_CRISPEDGES)
+            childPaintInfo.context->setShouldAntialias(false);
+
+        for (int i = 0; i < 3; i++) {
+            switch (svgStyle.paintOrderType(i)) {
+            case PT_FILL: {
+                GraphicsContextStateSaver stateSaver(*childPaintInfo.context, false);
+                if (!SVGRenderSupport::updateGraphicsContext(stateSaver, m_renderSVGShape.style(), m_renderSVGShape, ApplyToFillMode))
+                    break;
+                fillShape(childPaintInfo.context);
+                break;
+            }
+            case PT_STROKE:
+                if (svgStyle.hasVisibleStroke()) {
+                    GraphicsContextStateSaver stateSaver(*childPaintInfo.context, false);
+                    AffineTransform nonScalingTransform;
+                    const AffineTransform* additionalPaintServerTransform = 0;
+
+                    if (m_renderSVGShape.hasNonScalingStroke()) {
+                        nonScalingTransform = m_renderSVGShape.nonScalingStrokeTransform();
+                        if (!setupNonScalingStrokeContext(nonScalingTransform, stateSaver))
+                            return;
+
+                        // Non-scaling stroke needs to reset the transform back to the host transform.
+                        additionalPaintServerTransform = &nonScalingTransform;
+                    }
+
+                    if (!SVGRenderSupport::updateGraphicsContext(stateSaver, m_renderSVGShape.style(), m_renderSVGShape, ApplyToStrokeMode, additionalPaintServerTransform))
+                        break;
+                    strokeShape(childPaintInfo.context);
+                }
+                break;
+            case PT_MARKERS:
+                paintMarkers(childPaintInfo);
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+                break;
+            }
+        }
+    }
+
+    if (m_renderSVGShape.style()->outlineWidth())
+        ObjectPainter(m_renderSVGShape).paintOutline(childPaintInfo, IntRect(boundingBox));
+}
+
+void SVGShapePainter::fillShape(GraphicsContext* context)
+{
+    switch (m_renderSVGShape.geometryCodePath()) {
+    case RectGeometryFastPath:
+        context->fillRect(m_renderSVGShape.objectBoundingBox());
+        break;
+    case EllipseGeometryFastPath:
+        context->fillEllipse(m_renderSVGShape.objectBoundingBox());
+        break;
+    default:
+        context->fillPath(m_renderSVGShape.path());
+    }
+}
+
+void SVGShapePainter::strokeShape(GraphicsContext* context)
+{
+    if (!m_renderSVGShape.style()->svgStyle().hasVisibleStroke())
+        return;
+
+    switch (m_renderSVGShape.geometryCodePath()) {
+    case RectGeometryFastPath:
+        context->strokeRect(m_renderSVGShape.objectBoundingBox(), m_renderSVGShape.strokeWidth());
+        break;
+    case EllipseGeometryFastPath:
+        context->strokeEllipse(m_renderSVGShape.objectBoundingBox());
+        break;
+    default:
+        ASSERT(m_renderSVGShape.hasPath());
+        Path* usePath = &m_renderSVGShape.path();
+        if (m_renderSVGShape.hasNonScalingStroke())
+            usePath = m_renderSVGShape.nonScalingStrokePath(usePath, m_renderSVGShape.nonScalingStrokeTransform());
+        context->strokePath(*usePath);
+        strokeZeroLengthLineCaps(context);
+    }
+}
+
+void SVGShapePainter::paintMarkers(PaintInfo& paintInfo)
+{
+    const Vector<MarkerPosition>* markerPositions = m_renderSVGShape.markerPositions();
+    if (!markerPositions || markerPositions->isEmpty())
+        return;
+
+    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(&m_renderSVGShape);
+    if (!resources)
+        return;
+
+    RenderSVGResourceMarker* markerStart = resources->markerStart();
+    RenderSVGResourceMarker* markerMid = resources->markerMid();
+    RenderSVGResourceMarker* markerEnd = resources->markerEnd();
+    if (!markerStart && !markerMid && !markerEnd)
+        return;
+
+    float strokeWidth = m_renderSVGShape.strokeWidth();
+    unsigned size = markerPositions->size();
+    for (unsigned i = 0; i < size; ++i) {
+        if (RenderSVGResourceMarker* marker = SVGMarkerData::markerForType((*markerPositions)[i].type, markerStart, markerMid, markerEnd))
+            SVGMarkerPainter(*marker).paint(paintInfo, (*markerPositions)[i], strokeWidth);
+    }
+}
+
+void SVGShapePainter::strokeZeroLengthLineCaps(GraphicsContext* context)
+{
+    const Vector<FloatPoint>* zeroLengthLineCaps = m_renderSVGShape.zeroLengthLineCaps();
+    if (!zeroLengthLineCaps || zeroLengthLineCaps->isEmpty())
+        return;
+
+    Path* usePath;
+    AffineTransform nonScalingTransform;
+
+    if (m_renderSVGShape.hasNonScalingStroke())
+        nonScalingTransform = m_renderSVGShape.nonScalingStrokeTransform();
+
+    GraphicsContextStateSaver stateSaver(*context, true);
+    useStrokeStyleToFill(context);
+    for (size_t i = 0; i < zeroLengthLineCaps->size(); ++i) {
+        usePath = zeroLengthLinecapPath((*zeroLengthLineCaps)[i]);
+        if (m_renderSVGShape.hasNonScalingStroke())
+            usePath = m_renderSVGShape.nonScalingStrokePath(usePath, nonScalingTransform);
+        context->fillPath(*usePath);
+    }
+}
+
+Path* SVGShapePainter::zeroLengthLinecapPath(const FloatPoint& linecapPosition) const
+{
+    DEFINE_STATIC_LOCAL(Path, tempPath, ());
+
+    tempPath.clear();
+    if (m_renderSVGShape.style()->svgStyle().capStyle() == SquareCap)
+        tempPath.addRect(RenderSVGPath::zeroLengthSubpathRect(linecapPosition, m_renderSVGShape.strokeWidth()));
+    else
+        tempPath.addEllipse(RenderSVGPath::zeroLengthSubpathRect(linecapPosition, m_renderSVGShape.strokeWidth()));
+
+    return &tempPath;
+}
+
+} // namespace blink