C++ FloatSize::setHeight方法代码示例

void RenderSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
{
    // Spec: http://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
    // SVG needs to specify how to calculate some intrinsic sizing properties to enable inclusion within other languages.

    // The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including SVG from an ‘object’
    // element in HTML styled with CSS. It is possible (indeed, common) for an SVG graphic to have an intrinsic aspect ratio but
    // not to have an intrinsic width or height. The intrinsic aspect ratio must be calculated based upon the following rules:
    // - The aspect ratio is calculated by dividing a width by a height.
    // - If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers (in, mm, cm, pt, pc,
    //   px, em, ex) or in user units, then the aspect ratio is calculated from the ‘width’ and ‘height’ attributes after
    //   resolving both values to user units.
    intrinsicSize.setWidth(floatValueForLength(svgSVGElement().intrinsicWidth(), 0));
    intrinsicSize.setHeight(floatValueForLength(svgSVGElement().intrinsicHeight(), 0));


    if (!intrinsicSize.isEmpty())
        intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
    else {
        // - If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted), the
        //   aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG document
        //   fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio cannot be
        //   calculated and is considered unspecified.
        FloatSize viewBoxSize = svgSVGElement().viewBox().size();
        if (!viewBoxSize.isEmpty()) {
            // The viewBox can only yield an intrinsic ratio, not an intrinsic size.
            intrinsicRatio = viewBoxSize.width() / static_cast<double>(viewBoxSize.height());
        }
    }
}

FloatSize LayoutReplaced::constrainIntrinsicSizeToMinMax(
    const IntrinsicSizingInfo& intrinsicSizingInfo) const {
    // Constrain the intrinsic size along each axis according to minimum and
    // maximum width/heights along the opposite axis. So for example a maximum
    // width that shrinks our width will result in the height we compute here
    // having to shrink in order to preserve the aspect ratio. Because we compute
    // these values independently along each axis, the final returned size may in
    // fact not preserve the aspect ratio.
    // TODO(davve): Investigate using only the intrinsic aspect ratio here.
    FloatSize constrainedSize = intrinsicSizingInfo.size;
    if (!intrinsicSizingInfo.aspectRatio.isEmpty() &&
            !intrinsicSizingInfo.size.isEmpty() && style()->logicalWidth().isAuto() &&
            style()->logicalHeight().isAuto()) {
        // We can't multiply or divide by 'intrinsicSizingInfo.aspectRatio' here, it
        // breaks tests, like fast/images/zoomed-img-size.html, which
        // can only be fixed once subpixel precision is available for things like
        // intrinsicWidth/Height - which include zoom!
        constrainedSize.setWidth(LayoutBox::computeReplacedLogicalHeight() *
                                 intrinsicSizingInfo.size.width() /
                                 intrinsicSizingInfo.size.height());
        constrainedSize.setHeight(LayoutBox::computeReplacedLogicalWidth() *
                                  intrinsicSizingInfo.size.height() /
                                  intrinsicSizingInfo.size.width());
    }
    return constrainedSize;
}

void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, SkXfermode::Mode op, const IntSize& repeatSpacing)
{
    FloatSize intrinsicTileSize = size();
    if (hasRelativeWidth())
        intrinsicTileSize.setWidth(scaledTileSize.width());
    if (hasRelativeHeight())
        intrinsicTileSize.setHeight(scaledTileSize.height());

    FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
                    scaledTileSize.height() / intrinsicTileSize.height());

    FloatSize actualTileSize(scaledTileSize.width() + repeatSpacing.width(), scaledTileSize.height() + repeatSpacing.height());
    FloatRect oneTileRect;
    oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), actualTileSize.width()) - actualTileSize.width(), actualTileSize.width()));
    oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), actualTileSize.height()) - actualTileSize.height(), actualTileSize.height()));
    oneTileRect.setSize(scaledTileSize);

    // Check and see if a single draw of the image can cover the entire area we are supposed to tile.
    if (oneTileRect.contains(destRect)) {
        FloatRect visibleSrcRect;
        visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
        visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
        visibleSrcRect.setWidth(destRect.width() / scale.width());
        visibleSrcRect.setHeight(destRect.height() / scale.height());
        ctxt->drawImage(this, destRect, visibleSrcRect, op, DoNotRespectImageOrientation);
        return;
    }

    FloatRect tileRect(FloatPoint(), intrinsicTileSize);
    drawPattern(ctxt, tileRect, scale, oneTileRect.location(), op, destRect, repeatSpacing);

    startAnimation();
}

void Image::drawTiled(GraphicsContext& ctxt,
                      const FloatRect& destRect,
                      const FloatPoint& srcPoint,
                      const FloatSize& scaledTileSize,
                      SkBlendMode op,
                      const FloatSize& repeatSpacing) {
  FloatSize intrinsicTileSize = FloatSize(size());
  if (hasRelativeSize()) {
    intrinsicTileSize.setWidth(scaledTileSize.width());
    intrinsicTileSize.setHeight(scaledTileSize.height());
  }

  FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
                  scaledTileSize.height() / intrinsicTileSize.height());

  const FloatRect oneTileRect = computeTileContaining(
      destRect.location(), scaledTileSize, srcPoint, repeatSpacing);

  // Check and see if a single draw of the image can cover the entire area we
  // are supposed to tile.
  if (oneTileRect.contains(destRect)) {
    const FloatRect visibleSrcRect =
        computeSubsetForTile(oneTileRect, destRect, intrinsicTileSize);
    ctxt.drawImage(this, destRect, &visibleSrcRect, op,
                   DoNotRespectImageOrientation);
    return;
  }

  FloatRect tileRect(FloatPoint(), intrinsicTileSize);
  drawPattern(ctxt, tileRect, scale, oneTileRect.location(), op, destRect,
              repeatSpacing);

  startAnimation();
}

FloatPoint FixedPositionViewportConstraints::layerPositionForViewportRect(const FloatRect& viewportRect) const
{
    FloatSize offset;

    if (hasAnchorEdge(AnchorEdgeLeft))
        offset.setWidth(viewportRect.x() - m_viewportRectAtLastLayout.x());
    else if (hasAnchorEdge(AnchorEdgeRight))
        offset.setWidth(viewportRect.maxX() - m_viewportRectAtLastLayout.maxX());

    if (hasAnchorEdge(AnchorEdgeTop))
        offset.setHeight(viewportRect.y() - m_viewportRectAtLastLayout.y());
    else if (hasAnchorEdge(AnchorEdgeBottom))
        offset.setHeight(viewportRect.maxY() - m_viewportRectAtLastLayout.maxY());

    return m_layerPositionAtLastLayout + offset;
}

FloatSize Frame::resizePageRectsKeepingRatio(const FloatSize& originalSize, const FloatSize& expectedSize)
{
    FloatSize resultSize;
    if (!contentRenderer())
        return FloatSize();

    if (contentRenderer()->style()->isHorizontalWritingMode()) {
        float ratio = originalSize.height() / originalSize.width();
        resultSize.setWidth(floorf(expectedSize.width()));
        resultSize.setHeight(floorf(resultSize.width() * ratio));
    } else {
        float ratio = originalSize.width() / originalSize.height();
        resultSize.setHeight(floorf(expectedSize.height()));
        resultSize.setWidth(floorf(resultSize.height() * ratio));
    }
    return resultSize;
}

void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point) const
{
    FS_STATE* iType = font->platformData().scaledFont(context->getCTM().yScale());
    if (!iType)
        return;

    FloatPoint adjustedPoint = point;

    if (font->platformData().orientation() == Vertical)
        adjustedPoint.move(-(font->fontMetrics().floatAscent(IdeographicBaseline) - font->fontMetrics().floatAscent()), 0);

    bool softwareBlurRequired = context->state().shadowBlur / font->fontMetrics().xHeight() > 0.5;

    FloatSize currentShadowOffset;
    float currentShadowBlur;
    Color currentShadowColor;
    ColorSpace currentColorSpace;

    // If we have a shadow blur, and it is too big to apply at text-render time, we must render it now.
    if (context->hasShadow() && softwareBlurRequired) {
        context->getShadow(currentShadowOffset, currentShadowBlur, currentShadowColor, currentColorSpace);

        const GraphicsContextState state = context->state();
        FloatSize offset = state.shadowOffset;
        if (state.shadowsIgnoreTransforms)
            offset.setHeight(-offset.height());
        ShadowBlur shadow(FloatSize(state.shadowBlur, state.shadowBlur), offset, state.shadowColor, state.shadowColorSpace);
        FloatPoint minPoint(adjustedPoint.x(), adjustedPoint.y() - fontMetrics().ascent());
        FloatPoint maxPoint(adjustedPoint.x(), adjustedPoint.y() + fontMetrics().descent());
        FloatPoint currentPoint = adjustedPoint;
        for (int i = 0; i < numGlyphs; ++i) {
            currentPoint += *glyphBuffer.advances(from + i);
            minPoint.setX(std::min(minPoint.x(), currentPoint.x()));
            minPoint.setY(std::min(minPoint.y(), currentPoint.y()));
            maxPoint = maxPoint.expandedTo(currentPoint);
        }
        const FloatRect boundingRect(minPoint.x(), minPoint.y(), maxPoint.x() - minPoint.x(), maxPoint.y() - minPoint.y());
        GraphicsContext* shadowContext = shadow.beginShadowLayer(context, boundingRect);
        if (shadowContext) {
            iType = font->platformData().scaledFont(shadowContext->getCTM().yScale());
            shadowContext->platformContext()->addGlyphs(glyphBuffer.glyphs(from),
                    reinterpret_cast<const BlackBerry::Platform::FloatSize*>(glyphBuffer.advances(from)),
                    numGlyphs, adjustedPoint, iType, 0, 0);
            iType = font->platformData().scaledFont(context->getCTM().yScale());
            shadow.endShadowLayer(context);
        }
        context->platformContext()->clearShadow();
    }

    context->platformContext()->addGlyphs(glyphBuffer.glyphs(from),
                                          reinterpret_cast<const BlackBerry::Platform::FloatSize*>(glyphBuffer.advances(from)),
                                          numGlyphs, adjustedPoint, iType,
                                          context->fillGradient() ? context->fillGradient()->platformGradient() : (context->fillPattern() ? context->fillPattern()->platformPattern(AffineTransform()) : static_cast<BlackBerry::Platform::Graphics::Paint*>(0)),
                                          context->strokeGradient() ? context->strokeGradient()->platformGradient() : (context->strokePattern() ? context->strokePattern()->platformPattern(AffineTransform()) : static_cast<BlackBerry::Platform::Graphics::Paint*>(0)));

    if (softwareBlurRequired)
        context->platformContext()->setShadow(currentShadowOffset, currentShadowBlur, currentShadowColor.isValid() ? currentShadowColor.rgb() : makeRGBA(0, 0, 0, 0xFF / 3), context->state().shadowsIgnoreTransforms);
}

// FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things.
void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect,
    const FloatSize& providedTileScaleFactor, TileRule hRule, TileRule vRule, CompositeOperator op)
{
    if (mayFillWithSolidColor()) {
        fillWithSolidColor(ctxt, dstRect, solidColor(), op);
        return;
    }

    // FIXME: We do not support 'space' yet. For now just map it to 'repeat'.
    if (hRule == SpaceTile)
        hRule = RepeatTile;
    if (vRule == SpaceTile)
        vRule = RepeatTile;

    // FIXME: if this code is used for background-repeat: round (in addition to
    // border-image-repeat), then add logic to deal with the background-size: auto
    // special case. The aspect ratio should be maintained in this case.
    FloatSize tileScaleFactor = providedTileScaleFactor;
    bool useLowInterpolationQuality = false;
    if (hRule == RoundTile) {
        float hRepetitions = std::max(1.0f, roundf(dstRect.width() / (tileScaleFactor.width() * srcRect.width())));
        tileScaleFactor.setWidth(dstRect.width() / (srcRect.width() * hRepetitions));
    }
    if (vRule == RoundTile) {
        float vRepetitions = std::max(1.0f, roundf(dstRect.height() / (tileScaleFactor.height() * srcRect.height())));
        tileScaleFactor.setHeight(dstRect.height() / (srcRect.height() * vRepetitions));
    }
    if (hRule == RoundTile || vRule == RoundTile) {
        // High interpolation quality rounds the scaled tile to an integer size (see Image::drawPattern).
        // To avoid causing a visual problem, linear interpolation must be used instead.
        // FIXME: Allow using high-quality interpolation in this case, too.
        useLowInterpolationQuality = true;
    }

    // We want to construct the phase such that the pattern is centered (when stretch is not
    // set for a particular rule).
    float hPhase = tileScaleFactor.width() * srcRect.x();
    float vPhase = tileScaleFactor.height() * srcRect.y();
    float scaledTileWidth = tileScaleFactor.width() * srcRect.width();
    float scaledTileHeight = tileScaleFactor.height() * srcRect.height();
    if (hRule == Image::RepeatTile)
        hPhase -= (dstRect.width() - scaledTileWidth) / 2;
    if (vRule == Image::RepeatTile)
        vPhase -= (dstRect.height() - scaledTileHeight) / 2;
    FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);

    if (useLowInterpolationQuality) {
        InterpolationQuality previousInterpolationQuality = ctxt->imageInterpolationQuality();
        ctxt->setImageInterpolationQuality(InterpolationLow);
        drawPattern(ctxt, srcRect, tileScaleFactor, patternPhase, op, dstRect);
        ctxt->setImageInterpolationQuality(previousInterpolationQuality);
    } else {
        drawPattern(ctxt, srcRect, tileScaleFactor, patternPhase, op, dstRect);
    }

    startAnimation();
}

static inline void ensureRadiiDoNotOverlap(FloatRect &bounds, FloatSize &radii)
{
    float widthRatio = bounds.width() / (2 * radii.width());
    float heightRatio = bounds.height() / (2 * radii.height());
    float reductionRatio = std::min<float>(widthRatio, heightRatio);
    if (reductionRatio < 1) {
        radii.setWidth(reductionRatio * radii.width());
        radii.setHeight(reductionRatio * radii.height());
    }
}

FloatSize LocalFrame::resizePageRectsKeepingRatio(const FloatSize& originalSize, const FloatSize& expectedSize)
{
    FloatSize resultSize;
    if (!contentRenderer())
        return FloatSize();

    if (contentRenderer()->style()->isHorizontalWritingMode()) {
        ASSERT(fabs(originalSize.width()) > std::numeric_limits<float>::epsilon());
        float ratio = originalSize.height() / originalSize.width();
        resultSize.setWidth(floorf(expectedSize.width()));
        resultSize.setHeight(floorf(resultSize.width() * ratio));
    } else {
        ASSERT(fabs(originalSize.height()) > std::numeric_limits<float>::epsilon());
        float ratio = originalSize.width() / originalSize.height();
        resultSize.setHeight(floorf(expectedSize.height()));
        resultSize.setWidth(floorf(resultSize.height() * ratio));
    }
    return resultSize;
}

FloatSize MediaStreamPrivate::intrinsicSize() const
{
    FloatSize size;

    if (m_activeVideoTrack) {
        const RealtimeMediaSourceSettings& setting = m_activeVideoTrack->settings();
        size.setWidth(setting.width());
        size.setHeight(setting.height());
    }

    return size;
}

FloatSize MediaStreamPrivate::intrinsicSize() const
{
    FloatSize size;

    if (m_activeVideoTrack) {
        const RealtimeMediaSourceStates& states = m_activeVideoTrack->source()->states();
        size.setWidth(states.width());
        size.setHeight(states.height());
    }

    return size;
}

void RenderReplaced::computeAspectRatioInformationForRenderBox(RenderBox* contentRenderer, FloatSize& constrainedSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
    FloatSize intrinsicSize;
    if (contentRenderer) {
        contentRenderer->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
        if (intrinsicRatio)
            ASSERT(!isPercentageIntrinsicSize);

        // Handle zoom & vertical writing modes here, as the embedded document doesn't know about them.
        if (!isPercentageIntrinsicSize) {
            intrinsicSize.scale(style().effectiveZoom());
            if (isRenderImage())
                intrinsicSize.scale(toRenderImage(this)->imageDevicePixelRatio());
        }

        if (hasAspectRatio() && isPercentageIntrinsicSize)
            intrinsicRatio = 1;
            
        // Update our intrinsic size to match what the content renderer has computed, so that when we
        // constrain the size below, the correct intrinsic size will be obtained for comparison against
        // min and max widths.
        if (intrinsicRatio && !isPercentageIntrinsicSize && !intrinsicSize.isEmpty())
            m_intrinsicSize = LayoutSize(intrinsicSize);

        if (!isHorizontalWritingMode()) {
            if (intrinsicRatio)
                intrinsicRatio = 1 / intrinsicRatio;
            intrinsicSize = intrinsicSize.transposedSize();
        }
    } else {
        computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
        if (intrinsicRatio) {
            ASSERT(!isPercentageIntrinsicSize);
            if (!intrinsicSize.isEmpty())
                m_intrinsicSize = LayoutSize(isHorizontalWritingMode() ? intrinsicSize : intrinsicSize.transposedSize());
        }
    }

    // Now constrain the intrinsic size along each axis according to minimum and maximum width/heights along the
    // opposite axis. So for example a maximum width that shrinks our width will result in the height we compute here
    // having to shrink in order to preserve the aspect ratio. Because we compute these values independently along
    // each axis, the final returned size may in fact not preserve the aspect ratio.
    // FIXME: In the long term, it might be better to just return this code more to the way it used to be before this
    // function was added, since all it has done is make the code more unclear.
    constrainedSize = intrinsicSize;
    if (intrinsicRatio && !isPercentageIntrinsicSize && !intrinsicSize.isEmpty() && style().logicalWidth().isAuto() && style().logicalHeight().isAuto()) {
        // We can't multiply or divide by 'intrinsicRatio' here, it breaks tests, like fast/images/zoomed-img-size.html, which
        // can only be fixed once subpixel precision is available for things like intrinsicWidth/Height - which include zoom!
        constrainedSize.setWidth(RenderBox::computeReplacedLogicalHeight() * intrinsicSize.width() / intrinsicSize.height());
        constrainedSize.setHeight(RenderBox::computeReplacedLogicalWidth() * intrinsicSize.height() / intrinsicSize.width());
    }
}

void RenderSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
    // Spec: http://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
    // SVG needs to specify how to calculate some intrinsic sizing properties to enable inclusion within other languages.
    // The intrinsic width and height of the viewport of SVG content must be determined from the ‘width’ and ‘height’ attributes.
    // If either of these are not specified, a value of '100%' must be assumed. Note: the ‘width’ and ‘height’ attributes are not
    // the same as the CSS width and height properties. Specifically, percentage values do not provide an intrinsic width or height,
    // and do not indicate a percentage of the containing block. Rather, once the viewport is established, they indicate the portion
    // of the viewport that is actually covered by image data.
    SVGSVGElement* svg = toSVGSVGElement(node());
    ASSERT(svg);
    Length intrinsicWidthAttribute = svg->intrinsicWidth(SVGSVGElement::IgnoreCSSProperties);
    Length intrinsicHeightAttribute = svg->intrinsicHeight(SVGSVGElement::IgnoreCSSProperties);

    // The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including SVG from an ‘object’
    // element in HTML styled with CSS. It is possible (indeed, common) for an SVG graphic to have an intrinsic aspect ratio but
    // not to have an intrinsic width or height. The intrinsic aspect ratio must be calculated based upon the following rules:
    // - The aspect ratio is calculated by dividing a width by a height.
    // - If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers (in, mm, cm, pt, pc,
    //   px, em, ex) or in user units, then the aspect ratio is calculated from the ‘width’ and ‘height’ attributes after
    //   resolving both values to user units.
    if (intrinsicWidthAttribute.isFixed() || intrinsicHeightAttribute.isFixed()) {
        if (intrinsicWidthAttribute.isFixed())
            intrinsicSize.setWidth(floatValueForLength(intrinsicWidthAttribute, 0));
        if (intrinsicHeightAttribute.isFixed())
            intrinsicSize.setHeight(floatValueForLength(intrinsicHeightAttribute, 0));
        if (!intrinsicSize.isEmpty())
            intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
        return;
    }

    // - If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted), the
    //   aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG document
    //   fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio cannot be
    //   calculated and is considered unspecified.
    intrinsicSize = svg->viewBox().size();
    if (!intrinsicSize.isEmpty()) {
        // The viewBox can only yield an intrinsic ratio, not an intrinsic size.
        intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
        intrinsicSize = FloatSize();
        return;
    }

    // If our intrinsic size is in percentage units, return those to the caller through the intrinsicSize. Notify the caller
    // about the special situation, by setting isPercentageIntrinsicSize=true, so it knows how to interpret the return values.
    if (intrinsicWidthAttribute.isPercent() && intrinsicHeightAttribute.isPercent()) {
        isPercentageIntrinsicSize = true;
        intrinsicSize = FloatSize(intrinsicWidthAttribute.percent(), intrinsicHeightAttribute.percent());
    }
}

bool RenderSVGResourceFilter::fitsInMaximumImageSize(const FloatSize& size, FloatSize& scale)
{
    bool matchesFilterSize = true;
    if (size.width() > kMaxFilterSize) {
        scale.setWidth(scale.width() * kMaxFilterSize / size.width());
        matchesFilterSize = false;
    }
    if (size.height() > kMaxFilterSize) {
        scale.setHeight(scale.height() * kMaxFilterSize / size.height());
        matchesFilterSize = false;
    }

    return matchesFilterSize;
}