C++ RenderSVGResourceSolidColor类代码示例

bool SVGInlineTextBox::acquirePaintingResource(GraphicsContext*& context, float scalingFactor, RenderObject* renderer, RenderStyle* style)
{
    ASSERT(scalingFactor);
    ASSERT(renderer);
    ASSERT(style);
    ASSERT(m_paintingResourceMode != ApplyToDefaultMode);

    Color fallbackColor;
    if (m_paintingResourceMode & ApplyToFillMode)
        m_paintingResource = RenderSVGResource::fillPaintingResource(renderer, style, fallbackColor);
    else if (m_paintingResourceMode & ApplyToStrokeMode)
        m_paintingResource = RenderSVGResource::strokePaintingResource(renderer, style, fallbackColor);
    else {
        // We're either called for stroking or filling.
        ASSERT_NOT_REACHED();
    }

    if (!m_paintingResource)
        return false;

    if (!m_paintingResource->applyResource(renderer, style, context, m_paintingResourceMode)) {
        if (fallbackColor.isValid()) {
            RenderSVGResourceSolidColor* fallbackResource = RenderSVGResource::sharedSolidPaintingResource();
            fallbackResource->setColor(fallbackColor);

            m_paintingResource = fallbackResource;
            m_paintingResource->applyResource(renderer, style, context, m_paintingResourceMode);
        }
    }

    if (scalingFactor != 1 && m_paintingResourceMode & ApplyToStrokeMode)
        context->setStrokeThickness(context->strokeThickness() * scalingFactor);

    return true;
}

void SVGTextRunRenderingContext::drawSVGGlyphs(GraphicsContext* context, const SimpleFontData* fontData, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point) const
{
    auto activePaintingResource = this->activePaintingResource();
    if (!activePaintingResource) {
        // TODO: We're only supporting simple filled HTML text so far.
        RenderSVGResourceSolidColor* solidPaintingResource = RenderSVGResource::sharedSolidPaintingResource();
        solidPaintingResource->setColor(context->fillColor());
        activePaintingResource = solidPaintingResource;
    }

    auto& elementRenderer = renderer().isRenderElement() ? toRenderElement(renderer()) : *renderer().parent();
    RenderStyle& style = elementRenderer.style();

    ASSERT(activePaintingResource);

    RenderSVGResourceMode resourceMode = context->textDrawingMode() == TextModeStroke ? ApplyToStrokeMode : ApplyToFillMode;
    auto translator(createGlyphToPathTranslator(*fontData, glyphBuffer, from, numGlyphs, point));
    while (translator->containsMorePaths()) {
        Path glyphPath = translator->nextPath();
        if (activePaintingResource->applyResource(elementRenderer, style, context, resourceMode)) {
            float strokeThickness = context->strokeThickness();
            if (renderer().isSVGInlineText())
                context->setStrokeThickness(strokeThickness * toRenderSVGInlineText(renderer()).scalingFactor());
            activePaintingResource->postApplyResource(elementRenderer, context, resourceMode, &glyphPath, 0);
            context->setStrokeThickness(strokeThickness);
        }
    }
}

RenderSVGResource* RenderSVGResource::strokePaintingResource(const RenderObject* object, const RenderStyle* style)
{
    ASSERT(object);
    ASSERT(style);

    const SVGRenderStyle* svgStyle = style->svgStyle();
    if (!svgStyle || !svgStyle->hasStroke())
        return 0;

    SVGPaint* strokePaint = svgStyle->strokePaint();
    ASSERT(strokePaint);

    RenderSVGResource* strokePaintingResource = 0;
    FloatRect objectBoundingBox = object->objectBoundingBox();

    SVGPaint::SVGPaintType paintType = strokePaint->paintType();
    if (!objectBoundingBox.isEmpty()
        && (paintType == SVGPaint::SVG_PAINTTYPE_URI || paintType == SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR)) {
        AtomicString id(SVGURIReference::getTarget(strokePaint->uri()));
        strokePaintingResource = getRenderSVGResourceContainerById(object->document(), id);

        if (!strokePaintingResource)
            registerPendingResource(id, paintType, object);
    }

    if (paintType != SVGPaint::SVG_PAINTTYPE_URI && !strokePaintingResource) {
        RenderSVGResourceSolidColor* solidResource = sharedSolidPaintingResource();
        strokePaintingResource = solidResource;

        Color strokeColor;
        if (strokePaint->paintType() == SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR)
            strokeColor = style->visitedDependentColor(CSSPropertyColor);
        else
            strokeColor = strokePaint->color();

        adjustColorForPseudoRules(style, false /* useFillPaint */, strokeColor);

        // FIXME: Ideally invalid colors would never get set on the RenderStyle and this could turn into an ASSERT
        if (strokeColor.isValid())
            solidResource->setColor(strokeColor);
        else
            strokePaintingResource = 0;
    }

    if (!strokePaintingResource) {
        // default value (black), see bug 11017
        RenderSVGResourceSolidColor* solidResource = sharedSolidPaintingResource();
        solidResource->setColor(Color::black);
        strokePaintingResource = solidResource;
    }

    return strokePaintingResource;
}

void RenderSVGShape::strokeShape(const RenderStyle& style, GraphicsContext& originalContext)
{
    GraphicsContext* context = &originalContext;
    Color fallbackColor;
    if (RenderSVGResource* strokePaintingResource = RenderSVGResource::strokePaintingResource(*this, style, fallbackColor)) {
        if (strokePaintingResource->applyResource(*this, style, context, ApplyToStrokeMode))
            strokePaintingResource->postApplyResource(*this, context, ApplyToStrokeMode, 0, this);
        else if (fallbackColor.isValid()) {
            RenderSVGResourceSolidColor* fallbackResource = RenderSVGResource::sharedSolidPaintingResource();
            fallbackResource->setColor(fallbackColor);
            if (fallbackResource->applyResource(*this, style, context, ApplyToStrokeMode))
                fallbackResource->postApplyResource(*this, context, ApplyToStrokeMode, 0, this);
        }
    }
}

static inline RenderSVGResource* requestPaintingResource(RenderSVGResourceMode mode, RenderObject* object, const RenderStyle* style, Color& fallbackColor)
{
    ASSERT(object);
    ASSERT(style);

    // If we have no style at all, ignore it.
    const SVGRenderStyle* svgStyle = style->svgStyle();
    if (!svgStyle)
        return 0;

    // If we have no fill/stroke, return 0.
    if (mode == ApplyToFillMode) {
        if (!svgStyle->hasFill())
            return 0;
    } else {
        if (!svgStyle->hasStroke())
            return 0;
    }

    bool applyToFill = mode == ApplyToFillMode;
    SVGPaint::SVGPaintType paintType = applyToFill ? svgStyle->fillPaintType() : svgStyle->strokePaintType();
    if (paintType == SVGPaint::SVG_PAINTTYPE_NONE)
        return 0;

    Color color;
    switch (paintType) {
    case SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR:
    case SVGPaint::SVG_PAINTTYPE_RGBCOLOR:
    case SVGPaint::SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR:
    case SVGPaint::SVG_PAINTTYPE_URI_CURRENTCOLOR:
    case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR:
    case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR_ICCCOLOR:
        color = applyToFill ? svgStyle->fillPaintColor() : svgStyle->strokePaintColor();
    default:
        break;
    }

    if (style->insideLink() == InsideVisitedLink) {
        RenderStyle* visitedStyle = style->getCachedPseudoStyle(VISITED_LINK);
        ASSERT(visitedStyle);

        const SVGRenderStyle* svgVisitedStyle = visitedStyle->svgStyle();
        SVGPaint::SVGPaintType visitedPaintType = applyToFill ? svgVisitedStyle->fillPaintType() : svgVisitedStyle->strokePaintType();

        // For SVG_PAINTTYPE_CURRENTCOLOR, 'color' already contains the 'visitedColor'.
        if (visitedPaintType < SVGPaint::SVG_PAINTTYPE_URI_NONE && visitedPaintType != SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR) {
            const Color& visitedColor = applyToFill ? svgVisitedStyle->fillPaintColor() : svgVisitedStyle->strokePaintColor();
            if (visitedColor.isValid())
                color = Color(visitedColor.red(), visitedColor.green(), visitedColor.blue(), color.alpha());
        }
    }

    // If the primary resource is just a color, return immediately.
    RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
    if (paintType < SVGPaint::SVG_PAINTTYPE_URI_NONE) {
        // If an invalid fill color is specified, fallback to fill/stroke="none".
        if (!color.isValid())
            return 0;

        colorResource->setColor(color);
        return colorResource;
    }

    // If no resources are associated with the given renderer, return the color resource.
    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object);
    if (!resources) {
        // If a paint server is specified, and no or an invalid fallback color is given, default to fill/stroke="black".
        if (!color.isValid())
            color = Color::black;

        colorResource->setColor(color);
        return colorResource;
    }

    // If the requested resource is not available, return the color resource.
    RenderSVGResource* uriResource = mode == ApplyToFillMode ? resources->fill() : resources->stroke();
    if (!uriResource) {
        // If a paint server is specified, and no or an invalid fallback color is given, default to fill/stroke="black".
        if (!color.isValid())
            color = Color::black;

        colorResource->setColor(color);
        return colorResource;
    }

    // The paint server resource exists, though it may be invalid (pattern with width/height=0). Pass the fallback color to our caller
    // so it can use the solid color painting resource, if applyResource() on the URI resource failed.
    fallbackColor = color;
    return uriResource;
}

void SVGTextRunRenderingContext::drawSVGGlyphs(GraphicsContext* context, const TextRun& run, const SimpleFontData* fontData, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point) const
{
    SVGFontElement* fontElement = 0;
    SVGFontFaceElement* fontFaceElement = 0;

    const SVGFontData* svgFontData = svgFontAndFontFaceElementForFontData(fontData, fontFaceElement, fontElement);
    if (!fontElement || !fontFaceElement)
        return;

    // We can only paint SVGFonts if a context is available.
    RenderSVGResource* activePaintingResource = activePaintingResourceFromRun(run);
    RenderObject* renderObject = renderObjectFromRun(run);
    RenderObject* parentRenderObject = firstParentRendererForNonTextNode(renderObject);
    RenderStyle* parentRenderObjectStyle = 0;

    ASSERT(renderObject);
    if (!activePaintingResource) {
        // TODO: We're only supporting simple filled HTML text so far.
        RenderSVGResourceSolidColor* solidPaintingResource = RenderSVGResource::sharedSolidPaintingResource();
        solidPaintingResource->setColor(context->fillColor());
        activePaintingResource = solidPaintingResource;
    }
 
    bool isVerticalText = false;
    if (parentRenderObject) {
        parentRenderObjectStyle = parentRenderObject->style();
        ASSERT(parentRenderObjectStyle);
        isVerticalText = parentRenderObjectStyle->svgStyle()->isVerticalWritingMode();
    }

    float scale = scaleEmToUnits(fontData->platformData().size(), fontFaceElement->unitsPerEm());
    ASSERT(activePaintingResource);

    FloatPoint glyphOrigin;
    glyphOrigin.setX(svgFontData->horizontalOriginX() * scale);
    glyphOrigin.setY(svgFontData->horizontalOriginY() * scale);

    FloatPoint currentPoint = point;
    RenderSVGResourceMode resourceMode = context->textDrawingMode() == TextModeStroke ? ApplyToStrokeMode : ApplyToFillMode;
    for (int i = 0; i < numGlyphs; ++i) {
        Glyph glyph = glyphBuffer.glyphAt(from + i);
        if (!glyph)
            continue;

        float advance = glyphBuffer.advanceAt(from + i);
        SVGGlyph svgGlyph = fontElement->svgGlyphForGlyph(glyph);
        ASSERT(!svgGlyph.isPartOfLigature);
        ASSERT(svgGlyph.tableEntry == glyph);

        SVGGlyphElement::inheritUnspecifiedAttributes(svgGlyph, svgFontData);

        // FIXME: Support arbitary SVG content as glyph (currently limited to <glyph d="..."> situations).
        if (svgGlyph.pathData.isEmpty()) {
            if (isVerticalText)
                currentPoint.move(0, advance);
            else
                currentPoint.move(advance, 0);
            continue;
         }

        context->save();

        if (isVerticalText) {
            glyphOrigin.setX(svgGlyph.verticalOriginX * scale);
            glyphOrigin.setY(svgGlyph.verticalOriginY * scale);
         }

        AffineTransform glyphPathTransform;
        glyphPathTransform.translate(currentPoint.x() + glyphOrigin.x(), currentPoint.y() + glyphOrigin.y());
        glyphPathTransform.scale(scale, -scale);

        Path glyphPath = svgGlyph.pathData;
        glyphPath.transform(glyphPathTransform);

        if (activePaintingResource->applyResource(parentRenderObject, parentRenderObjectStyle, context, resourceMode)) {
            if (renderObject && renderObject->isSVGInlineText()) {
                const RenderSVGInlineText* textRenderer = toRenderSVGInlineText(renderObject);
                context->setStrokeThickness(context->strokeThickness() * textRenderer->scalingFactor());
            }
            activePaintingResource->postApplyResource(parentRenderObject, context, resourceMode, &glyphPath, 0);
         }
 
        context->restore();

        if (isVerticalText)
            currentPoint.move(0, advance);
        else
            currentPoint.move(advance, 0);
    }
}

static inline RenderSVGResource* requestPaintingResource(RenderSVGResourceMode mode, RenderObject* object, const RenderStyle* style, Color& fallbackColor)
{
    ASSERT(object);
    ASSERT(style);

    // If we have no style at all, ignore it.
    const SVGRenderStyle* svgStyle = style->svgStyle();
    if (!svgStyle)
        return 0;

    bool isRenderingMask = false;
    if (object->frame() && object->frame()->view())
        isRenderingMask = object->frame()->view()->paintBehavior() & PaintBehaviorRenderingSVGMask;

    // If we have no fill/stroke, return 0.
    if (mode == ApplyToFillMode) {
        // When rendering the mask for a RenderSVGResourceClipper, always use the initial fill paint server, and ignore stroke.
        if (isRenderingMask) {
            RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
            colorResource->setColor(SVGRenderStyle::initialFillPaintColor());
            return colorResource;
        }

        if (!svgStyle->hasFill())
            return 0;
    } else {
        if (!svgStyle->hasStroke() || isRenderingMask)
            return 0;
    }

    bool applyToFill = mode == ApplyToFillMode;
    SVGPaint::SVGPaintType paintType = applyToFill ? svgStyle->fillPaintType() : svgStyle->strokePaintType();
    if (paintType == SVGPaint::SVG_PAINTTYPE_NONE)
        return 0;

    Color color;
    switch (paintType) {
    case SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR:
    case SVGPaint::SVG_PAINTTYPE_RGBCOLOR:
    case SVGPaint::SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR:
    case SVGPaint::SVG_PAINTTYPE_URI_CURRENTCOLOR:
    case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR:
    case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR_ICCCOLOR:
        color = applyToFill ? svgStyle->fillPaintColor() : svgStyle->strokePaintColor();
    default:
        break;
    }

    if (style->insideLink() == InsideVisitedLink) {
        // FIXME: This code doesn't support the uri component of the visited link paint, https://bugs.webkit.org/show_bug.cgi?id=70006
        SVGPaint::SVGPaintType visitedPaintType = applyToFill ? svgStyle->visitedLinkFillPaintType() : svgStyle->visitedLinkStrokePaintType();

        // For SVG_PAINTTYPE_CURRENTCOLOR, 'color' already contains the 'visitedColor'.
        if (visitedPaintType < SVGPaint::SVG_PAINTTYPE_URI_NONE && visitedPaintType != SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR) {
            const Color& visitedColor = applyToFill ? svgStyle->visitedLinkFillPaintColor() : svgStyle->visitedLinkStrokePaintColor();
            if (visitedColor.isValid())
                color = Color(visitedColor.red(), visitedColor.green(), visitedColor.blue(), color.alpha());
        }
    }

    // If the primary resource is just a color, return immediately.
    RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
    if (paintType < SVGPaint::SVG_PAINTTYPE_URI_NONE) {
        if (!inheritColorFromParentStyleIfNeeded(object, applyToFill, color))
            return 0;

        colorResource->setColor(color);
        return colorResource;
    }

    // If no resources are associated with the given renderer, return the color resource.
    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object);
    if (!resources) {
        if (paintType == SVGPaint::SVG_PAINTTYPE_URI_NONE || !inheritColorFromParentStyleIfNeeded(object, applyToFill, color))
            return 0;

        colorResource->setColor(color);
        return colorResource;
    }

    // If the requested resource is not available, return the color resource.
    RenderSVGResource* uriResource = mode == ApplyToFillMode ? resources->fill() : resources->stroke();
    if (!uriResource) {
        if (!inheritColorFromParentStyleIfNeeded(object, applyToFill, color))
            return 0;

        colorResource->setColor(color);
        return colorResource;
    }

    // The paint server resource exists, though it may be invalid (pattern with width/height=0). Pass the fallback color to our caller
    // so it can use the solid color painting resource, if applyResource() on the URI resource failed.
    fallbackColor = color;
    return uriResource;
}