C++ GraphicsContext::clip方法代码示例

bool RenderThemeAndroid::paintButton(RenderObject* obj, const PaintInfo& info, const IntRect& rect)
{
    // If it is a disabled button, simply paint it to the master picture.
    Node* node = obj->node();
    Element* formControlElement = static_cast<Element*>(node);
    if (formControlElement) {
        android::WebFrame* webFrame = getWebFrame(node);
        if (webFrame) {
            GraphicsContext *context = info.context;
            IntRect innerrect = IntRect(rect.x() + paddingButton, rect.y() + paddingButton,
                    rect.width() - 2 * paddingButton, rect.height() - 2 * paddingButton);
            IntSize cornerrect = IntSize(cornerButton, cornerButton);
            Color bg, bright, dark, medium;
            if (formControlElement->isEnabledFormControl()) {
                bg = Color(defaultBgColor);
                bright = Color(defaultBgBright);
                dark = Color(defaultBgDark);
                medium = Color(defaultBgMedium);
            } else {
                bg = Color(disabledBgColor);
                bright = Color(disabledBgBright);
                dark = Color(disabledBgDark);
                medium = Color(disabledBgMedium);
            }
            context->save();
            context->clip(
                    IntRect(innerrect.x(), innerrect.y(), innerrect.width(), 1));
            context->fillRoundedRect(innerrect, cornerrect, cornerrect,
                    cornerrect, cornerrect, bright, context->fillColorSpace());
            context->restore();
            context->save();
            context->clip(IntRect(innerrect.x(), innerrect.y() + innerrect.height() - 1,
                    innerrect.width(), 1));
            context->fillRoundedRect(innerrect, cornerrect, cornerrect,
                    cornerrect, cornerrect, dark, context->fillColorSpace());
            context->restore();
            context->save();
            context->clip(IntRect(innerrect.x(), innerrect.y() + 1, innerrect.width(),
                    innerrect.height() - 2));
            context->fillRoundedRect(innerrect, cornerrect, cornerrect,
                    cornerrect, cornerrect, bg, context->fillColorSpace());
            context->restore();
            context->setStrokeColor(medium, context->strokeColorSpace());
            context->setStrokeThickness(1.0f);
            context->drawLine(IntPoint(innerrect.x(), innerrect.y() + cornerButton),
                    IntPoint(innerrect.x(), innerrect.y() + innerrect.height() - cornerButton));
            context->drawLine(IntPoint(innerrect.x() + innerrect.width(), innerrect.y() + cornerButton),
                    IntPoint(innerrect.x() + innerrect.width(), innerrect.y() + innerrect.height() - cornerButton));
        }
    }


    // We always return false so we do not request to be redrawn.
    return false;
}

void RenderEmbeddedObject::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (!showsUnavailablePluginIndicator())
        return;

    if (paintInfo.phase == PaintPhaseSelection)
        return;

    FloatRect contentRect;
    Path path;
    FloatRect replacementTextRect;
    Font font;
    TextRun run("");
    float textWidth;
    if (!getReplacementTextGeometry(paintOffset, contentRect, path, replacementTextRect, font, run, textWidth))
        return;

    GraphicsContext* context = paintInfo.context;
    GraphicsContextStateSaver stateSaver(*context);
    context->clip(contentRect);
    context->setAlphaAsFloat(replacementTextRoundedRectOpacity);
    context->setFillColor(Color::white);
    context->fillPath(path);

    const FontMetrics& fontMetrics = font.fontMetrics();
    float labelX = roundf(replacementTextRect.location().x() + (replacementTextRect.size().width() - textWidth) / 2);
    float labelY = roundf(replacementTextRect.location().y() + (replacementTextRect.size().height() - fontMetrics.height()) / 2 + fontMetrics.ascent());
    TextRunPaintInfo runInfo(run);
    runInfo.bounds = replacementTextRect;
    context->setAlphaAsFloat(replacementTextTextOpacity);
    context->setFillColor(Color::black);
    context->drawBidiText(font, runInfo, FloatPoint(labelX, labelY));
}

ImageBitmap::ImageBitmap(HTMLVideoElement* video, const IntRect& cropRect)
    : m_imageElement(nullptr)
    , m_cropRect(cropRect)
    , m_bitmapOffset(IntPoint())
{
    IntSize playerSize;

    if (video->webMediaPlayer())
        playerSize = video->webMediaPlayer()->naturalSize();

    IntRect videoRect = IntRect(IntPoint(), playerSize);
    IntRect srcRect = intersection(cropRect, videoRect);
    IntRect dstRect(IntPoint(), srcRect.size());

    OwnPtr<ImageBuffer> buf = ImageBuffer::create(videoRect.size());
    if (!buf)
        return;
    GraphicsContext* c = buf->context();
    c->clip(dstRect);
    c->translate(-srcRect.x(), -srcRect.y());
    video->paintCurrentFrameInContext(c, videoRect);
    m_bitmap = buf->copyImage(DontCopyBackingStore);
    m_bitmapRect = IntRect(IntPoint(std::max(0, -cropRect.x()), std::max(0, -cropRect.y())), srcRect.size());

    ScriptWrappable::init(this);
}

void FindIndicator::draw(GraphicsContext& graphicsContext, const IntRect& dirtyRect)
{
    for (size_t i = 0; i < m_textRects.size(); ++i) {
        FloatRect textRect = m_textRects[i];
        textRect.move(leftBorderThickness, topBorderThickness);

        graphicsContext.save();
        FloatRect outerPathRect = inflateRect(textRect, horizontalOutsetToCenterOfLightBorder, verticalOutsetToCenterOfLightBorder);
        graphicsContext.setShadow(FloatSize(shadowOffsetX, shadowOffsetY), shadowBlurRadius, shadowColor(), ColorSpaceSRGB);
        graphicsContext.addPath(pathWithRoundedRect(outerPathRect, cornerRadius));
        graphicsContext.setFillColor(lightBorderColor(), ColorSpaceDeviceRGB);
        graphicsContext.fillPath();
        graphicsContext.restore();

        graphicsContext.save();
        FloatRect innerPathRect = inflateRect(textRect, horizontalPaddingInsideLightBorder, verticalPaddingInsideLightBorder);
        graphicsContext.clip(pathWithRoundedRect(innerPathRect, cornerRadius));
        RefPtr<Gradient> gradient = Gradient::create(FloatPoint(innerPathRect.x(), innerPathRect.y()), FloatPoint(innerPathRect.x(), innerPathRect.bottom()));
        gradient->addColorStop(0, gradientLightColor());
        gradient->addColorStop(1, gradientDarkColor());
        graphicsContext.setFillGradient(gradient);
        graphicsContext.fillRect(outerPathRect);
        graphicsContext.restore();

        graphicsContext.save();
        graphicsContext.translate(FloatSize(roundf(leftBorderThickness), roundf(topBorderThickness) + m_contentImage->bounds().height()));
        graphicsContext.scale(FloatSize(1, -1));
        m_contentImage->paint(&graphicsContext, m_contentImage->bounds());
        graphicsContext.restore();
    }
}

void RenderEmbeddedObject::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (!pluginCrashedOrWasMissing())
        return;

    if (paintInfo.phase == PaintPhaseSelection)
        return;
    
    GraphicsContext* context = paintInfo.context;
    if (context->paintingDisabled())
        return;
    
    FloatRect contentRect;
    Path path;
    FloatRect replacementTextRect;
    Font font;
    TextRun run("");
    float textWidth;
    if (!getReplacementTextGeometry(paintOffset, contentRect, path, replacementTextRect, font, run, textWidth))
        return;
    
    GraphicsContextStateSaver stateSaver(*context);
    context->clip(contentRect);
    context->setAlpha(m_missingPluginIndicatorIsPressed ? replacementTextPressedRoundedRectOpacity : replacementTextRoundedRectOpacity);
    context->setFillColor(m_missingPluginIndicatorIsPressed ? replacementTextRoundedRectPressedColor() : Color::white, style()->colorSpace());
    context->fillPath(path);

    const FontMetrics& fontMetrics = font.fontMetrics();
    float labelX = roundf(replacementTextRect.location().x() + (replacementTextRect.size().width() - textWidth) / 2);
    float labelY = roundf(replacementTextRect.location().y() + (replacementTextRect.size().height() - fontMetrics.height()) / 2 + fontMetrics.ascent());
    context->setAlpha(m_missingPluginIndicatorIsPressed ? replacementTextPressedTextOpacity : replacementTextTextOpacity);
    context->setFillColor(Color::black, style()->colorSpace());
    context->drawBidiText(font, run, FloatPoint(labelX, labelY));
}

void HTMLCanvasPainter::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    GraphicsContext* context = paintInfo.context;

    LayoutRect contentRect = m_renderHTMLCanvas.contentBoxRect();
    contentRect.moveBy(paintOffset);
    LayoutRect paintRect = m_renderHTMLCanvas.replacedContentRect();
    paintRect.moveBy(paintOffset);

    bool clip = !contentRect.contains(paintRect);
    if (clip) {
        context->save();
        context->clip(contentRect);
    }

    // FIXME: InterpolationNone should be used if ImageRenderingOptimizeContrast is set.
    // See bug for more details: crbug.com/353716.
    InterpolationQuality interpolationQuality = m_renderHTMLCanvas.style()->imageRendering() == ImageRenderingOptimizeContrast ? InterpolationLow : CanvasDefaultInterpolationQuality;
    if (m_renderHTMLCanvas.style()->imageRendering() == ImageRenderingPixelated)
        interpolationQuality = InterpolationNone;

    InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
    context->setImageInterpolationQuality(interpolationQuality);
    toHTMLCanvasElement(m_renderHTMLCanvas.node())->paint(context, paintRect);
    context->setImageInterpolationQuality(previousInterpolationQuality);

    if (clip)
        context->restore();
}

void AcceleratedCompositingContext::paintContents(const GraphicsLayer*, GraphicsContext& context, GraphicsLayerPaintingPhase, const FloatRect& rectToPaint)
{
    context.save();
    context.clip(rectToPaint);
    core(&m_webView)->mainFrame().view()->paint(&context, enclosingIntRect(rectToPaint));
    context.restore();
}

void WebPage::drawRect(GraphicsContext& graphicsContext, const IntRect& rect)
{
    graphicsContext.save();
    graphicsContext.clip(rect);
    m_mainFrame->coreFrame()->view()->paint(&graphicsContext, rect);
    graphicsContext.restore();
}

void RenderVideo::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    MediaPlayer* mediaPlayer = mediaElement()->player();
    bool displayingPoster = videoElement()->shouldDisplayPosterImage();
    if (!displayingPoster && !mediaPlayer)
        return;

    LayoutRect rect = videoBox();
    if (rect.isEmpty())
        return;
    rect.moveBy(paintOffset);

    LayoutRect contentRect = contentBoxRect();
    contentRect.moveBy(paintOffset);
    GraphicsContext* context = paintInfo.context;
    bool clip = !contentRect.contains(rect);
    if (clip) {
        context->save();
        context->clip(contentRect);
    }

    if (displayingPoster)
        paintIntoRect(context, rect);
    else if ((document().view() && document().view()->paintBehavior() & PaintBehaviorFlattenCompositingLayers) || !acceleratedRenderingInUse())
        mediaPlayer->paint(context, pixelSnappedIntRect(rect));

    if (clip)
        context->restore();
}

void FindIndicator::draw(GraphicsContext& graphicsContext, const IntRect& /*dirtyRect*/)
{
#if ENABLE(LEGACY_FIND_INDICATOR_STYLE)
    for (size_t i = 0; i < m_textRectsInSelectionRectCoordinates.size(); ++i) {
        FloatRect textRect = m_textRectsInSelectionRectCoordinates[i];
        textRect.move(leftBorderThickness, topBorderThickness);

        FloatRect outerPathRect = inflateRect(textRect, horizontalOutsetToCenterOfLightBorder, verticalOutsetToCenterOfLightBorder);
        FloatRect innerPathRect = inflateRect(textRect, horizontalPaddingInsideLightBorder, verticalPaddingInsideLightBorder);

        {
            GraphicsContextStateSaver stateSaver(graphicsContext);
            graphicsContext.setShadow(FloatSize(shadowOffsetX, shadowOffsetY), shadowBlurRadius, shadowColor(), ColorSpaceSRGB);
            graphicsContext.setFillColor(lightBorderColor(), ColorSpaceDeviceRGB);
            graphicsContext.fillPath(pathWithRoundedRect(outerPathRect, cornerRadius));
        }

        {
            GraphicsContextStateSaver stateSaver(graphicsContext);
            graphicsContext.clip(pathWithRoundedRect(innerPathRect, cornerRadius));
            RefPtr<Gradient> gradient = Gradient::create(FloatPoint(innerPathRect.x(), innerPathRect.y()), FloatPoint(innerPathRect.x(), innerPathRect.maxY()));
            gradient->addColorStop(0, gradientLightColor());
            gradient->addColorStop(1, gradientDarkColor());
            graphicsContext.setFillGradient(gradient.releaseNonNull());
            graphicsContext.fillRect(outerPathRect);
        }

        {
            GraphicsContextStateSaver stateSaver(graphicsContext);
            graphicsContext.translate(FloatSize(roundf(leftBorderThickness), roundf(topBorderThickness)));

            IntRect contentImageRect = enclosingIntRect(m_textRectsInSelectionRectCoordinates[i]);
            m_contentImage->paint(graphicsContext, m_contentImageScaleFactor, contentImageRect.location(), contentImageRect);
        }
    }
#else
    for (auto& textRect : m_textRectsInSelectionRectCoordinates) {
        FloatRect blurRect = textRect;
        blurRect.move(flatShadowBlurRadius + flatStyleHorizontalBorder, flatShadowBlurRadius + flatStyleVerticalBorder);
        FloatRect outerPathRect = inflateRect(blurRect, flatStyleHorizontalBorder, flatStyleVerticalBorder);

        {
            GraphicsContextStateSaver stateSaver(graphicsContext);
            graphicsContext.setShadow(FloatSize(), flatRimShadowBlurRadius, flatRimShadowColor(), ColorSpaceSRGB);
            graphicsContext.setFillColor(flatHighlightColor(), ColorSpaceSRGB);
            graphicsContext.fillRect(outerPathRect);
            graphicsContext.setShadow(FloatSize(flatShadowOffsetX, flatShadowOffsetY), flatShadowBlurRadius, flatDropShadowColor(), ColorSpaceSRGB);
            graphicsContext.fillRect(outerPathRect);
        }

        {
            GraphicsContextStateSaver stateSaver(graphicsContext);
            graphicsContext.translate(FloatSize(flatShadowBlurRadius + flatStyleHorizontalBorder, flatShadowBlurRadius + flatStyleVerticalBorder));

            IntRect contentImageRect = enclosingIntRect(textRect);
            m_contentImage->paint(graphicsContext, m_contentImageScaleFactor, contentImageRect.location(), contentImageRect);
        }
    }
#endif
}

void TextureMapperImageBuffer::beginClip(const TransformationMatrix& matrix, const FloatRect& rect)
{
    GraphicsContext* context = currentContext();
    if (!context)
        return;
#if ENABLE(3D_RENDERING)
    TransformationMatrix previousTransform = context->get3DTransform();
#else
    AffineTransform previousTransform = context->getCTM();
#endif
    context->save();

#if ENABLE(3D_RENDERING)
    context->concat3DTransform(matrix);
#else
    context->concatCTM(matrix.toAffineTransform());
#endif

    context->clip(rect);

#if ENABLE(3D_RENDERING)
    context->set3DTransform(previousTransform);
#else
    context->setCTM(previousTransform);
#endif
}

GraphicsContext* FilterEffectRendererHelper::beginFilterEffect(GraphicsContext* oldContext)
{
    ASSERT(m_renderLayer);

    FilterEffectRenderer* filter = m_renderLayer->filterRenderer();
    filter->allocateBackingStoreIfNeeded();
    // Paint into the context that represents the SourceGraphic of the filter.
    GraphicsContext* sourceGraphicsContext = filter->inputContext();
    if (!sourceGraphicsContext || !FilterEffect::isFilterSizeValid(filter->absoluteFilterRegion())) {
        // Disable the filters and continue.
        m_haveFilterEffect = false;
        return oldContext;
    }

    m_savedGraphicsContext = oldContext;

    // Translate the context so that the contents of the layer is captuterd in the offscreen memory buffer.
    sourceGraphicsContext->save();
    // FIXME: can we just use sourceImageRect for everything, and get rid of
    // m_repaintRect?
    FloatPoint offset = filter->sourceImageRect().location();
    sourceGraphicsContext->translate(-offset.x(), -offset.y());
    sourceGraphicsContext->clearRect(m_repaintRect);
    sourceGraphicsContext->clip(m_repaintRect);

    return sourceGraphicsContext;
}

void CanvasRenderingContext2D::clip()
{
    GraphicsContext* c = drawingContext();
    if (!c)
        return;
    c->clip(state().m_path);
    clearPathForDashboardBackwardCompatibilityMode();
}

void PrintContext::spoolRect(GraphicsContext& ctx, const IntRect& rect)
{
    // FIXME: Not correct for vertical text.
    ctx.save();
    ctx.translate(-rect.x(), -rect.y());
    ctx.clip(rect);
    m_frame->view()->paintContents(&ctx, rect);
    ctx.restore();
}

GraphicsContext* ThreadSafeCoordinatedSurface::beginPaint(const IntRect& rect)
{
    ASSERT(m_imageBuffer);
    GraphicsContext* graphicsContext = m_imageBuffer->context();
    graphicsContext->save();
    graphicsContext->clip(rect);
    graphicsContext->translate(rect.x(), rect.y());
    return graphicsContext;
}