C++ FloatRect::maxY方法代码示例

void FloatRect::unite(const FloatRect& other)
{
    // Handle empty special cases first.
    if (other.isEmpty())
        return;
    if (isEmpty()) {
        *this = other;
        return;
    }

    float l = min(x(), other.x());
    float t = min(y(), other.y());
    float r = max(maxX(), other.maxX());
    float b = max(maxY(), other.maxY());

    setLocationAndSizeFromEdges(l, t, r, b);
}

void FloatRect::intersect(const FloatRect& other)
{
    float left = std::max(x(), other.x());
    float top = std::max(y(), other.y());
    float right = std::min(maxX(), other.maxX());
    float bottom = std::min(maxY(), other.maxY());

    // Return a clean empty rectangle for non-intersecting cases.
    if (left >= right || top >= bottom) {
        left = 0;
        top = 0;
        right = 0;
        bottom = 0;
    }

    setLocationAndSizeFromEdges(left, top, right, bottom);
}

FloatSize StickyPositionViewportConstraints::computeStickyOffset(const FloatRect& viewportRect) const
{
    FloatRect boxRect = m_absoluteStickyBoxRect;
    
    if (hasAnchorEdge(AnchorEdgeRight)) {
        float rightLimit = viewportRect.maxX() - m_rightOffset;
        float rightDelta = std::min<float>(0, rightLimit - m_absoluteStickyBoxRect.maxX());
        float availableSpace = std::min<float>(0, m_absoluteContainingBlockRect.x() - m_absoluteStickyBoxRect.x());
        if (rightDelta < availableSpace)
            rightDelta = availableSpace;

        boxRect.move(rightDelta, 0);
    }

    if (hasAnchorEdge(AnchorEdgeLeft)) {
        float leftLimit = viewportRect.x() + m_leftOffset;
        float leftDelta = std::max<float>(0, leftLimit - m_absoluteStickyBoxRect.x());
        float availableSpace = std::max<float>(0, m_absoluteContainingBlockRect.maxX() - m_absoluteStickyBoxRect.maxX());
        if (leftDelta > availableSpace)
            leftDelta = availableSpace;

        boxRect.move(leftDelta, 0);
    }
    
    if (hasAnchorEdge(AnchorEdgeBottom)) {
        float bottomLimit = viewportRect.maxY() - m_bottomOffset;
        float bottomDelta = std::min<float>(0, bottomLimit - m_absoluteStickyBoxRect.maxY());
        float availableSpace = std::min<float>(0, m_absoluteContainingBlockRect.y() - m_absoluteStickyBoxRect.y());
        if (bottomDelta < availableSpace)
            bottomDelta = availableSpace;

        boxRect.move(0, bottomDelta);
    }

    if (hasAnchorEdge(AnchorEdgeTop)) {
        float topLimit = viewportRect.y() + m_topOffset;
        float topDelta = std::max<float>(0, topLimit - m_absoluteStickyBoxRect.y());
        float availableSpace = std::max<float>(0, m_absoluteContainingBlockRect.maxY() - m_absoluteStickyBoxRect.maxY());
        if (topDelta > availableSpace)
            topDelta = availableSpace;

        boxRect.move(0, topDelta);
    }

    return boxRect.location() - m_absoluteStickyBoxRect.location();
}

void FloatRect::uniteIfNonZero(const FloatRect& other)
{
    // Handle empty special cases first.
    if (!other.width() && !other.height())
        return;
    if (!width() && !height()) {
        *this = other;
        return;
    }

    float left = min(x(), other.x());
    float top = min(y(), other.y());
    float right = max(maxX(), other.maxX());
    float bottom = max(maxY(), other.maxY());

    setLocationAndSizeFromEdges(left, top, right, bottom);
}

void FloatRect::intersect(const FloatRect& other)
{
    float l = max(x(), other.x());
    float t = max(y(), other.y());
    float r = min(maxX(), other.maxX());
    float b = min(maxY(), other.maxY());

    // Return a clean empty rectangle for non-intersecting cases.
    if (l >= r || t >= b) {
        l = 0;
        t = 0;
        r = 0;
        b = 0;
    }

    setLocationAndSizeFromEdges(l, t, r, b);
}

WindowFeatures::WindowFeatures(const String& dialogFeaturesString, const FloatRect& screenAvailableRect)
    : widthSet(true)
    , heightSet(true)
    , menuBarVisible(false)
    , toolBarVisible(false)
    , locationBarVisible(false)
    , fullscreen(false)
    , dialog(true)
{
    DialogFeaturesMap features;
    parseDialogFeatures(dialogFeaturesString, features);

    const bool trusted = false;

    // The following features from Microsoft's documentation are not implemented:
    // - default font settings
    // - width, height, left, and top specified in units other than "px"
    // - edge (sunken or raised, default is raised)
    // - dialogHide: trusted && boolFeature(features, "dialoghide"), makes dialog hide when you print
    // - help: boolFeature(features, "help", true), makes help icon appear in dialog (what does it do on Windows?)
    // - unadorned: trusted && boolFeature(features, "unadorned");

    width = floatFeature(features, "dialogwidth", 100, screenAvailableRect.width(), 620); // default here came from frame size of dialog in MacIE
    height = floatFeature(features, "dialogheight", 100, screenAvailableRect.height(), 450); // default here came from frame size of dialog in MacIE

    x = floatFeature(features, "dialogleft", screenAvailableRect.x(), screenAvailableRect.maxX() - width, -1);
    xSet = x > 0;
    y = floatFeature(features, "dialogtop", screenAvailableRect.y(), screenAvailableRect.maxY() - height, -1);
    ySet = y > 0;

    if (boolFeature(features, "center", true)) {
        if (!xSet) {
            x = screenAvailableRect.x() + (screenAvailableRect.width() - width) / 2;
            xSet = true;
        }
        if (!ySet) {
            y = screenAvailableRect.y() + (screenAvailableRect.height() - height) / 2;
            ySet = true;
        }
    }

    resizable = boolFeature(features, "resizable");
    scrollbarsVisible = boolFeature(features, "scroll", true);
    statusBarVisible = boolFeature(features, "status", !trusted);
}

void PlatformContextSkia::beginLayerClippedToImage(const FloatRect& rect,
                                                   const ImageBuffer* imageBuffer)
{
    SkRect bounds = { SkFloatToScalar(rect.x()), SkFloatToScalar(rect.y()),
                      SkFloatToScalar(rect.maxX()), SkFloatToScalar(rect.maxY()) };

    if (imageBuffer->internalSize().isEmpty()) {
        m_canvas->clipRect(bounds);
        return;
    }

    // Skia doesn't support clipping to an image, so we create a layer. The next
    // time restore is invoked the layer and |imageBuffer| are combined to
    // create the resulting image.

    m_state->m_clip = bounds;
    // Get the absolute coordinates of the stored clipping rectangle to make it
    // independent of any transform changes.
    canvas()->getTotalMatrix().mapRect(&m_state->m_clip);

    SkCanvas::SaveFlags saveFlags = static_cast<SkCanvas::SaveFlags>(SkCanvas::kHasAlphaLayer_SaveFlag | SkCanvas::kFullColorLayer_SaveFlag);
    saveLayer(&bounds, 0, saveFlags);

    const SkBitmap* bitmap = imageBuffer->context()->platformContext()->bitmap();

    if (m_trackOpaqueRegion) {
        SkRect opaqueRect = bitmap->isOpaque() ? m_state->m_clip : SkRect::MakeEmpty();
        m_opaqueRegion.setImageMask(opaqueRect);
    }

    // Copy off the image as |imageBuffer| may be deleted before restore is invoked.
    if (!bitmap->pixelRef()) {
        // The bitmap owns it's pixels. This happens when we've allocated the
        // pixels in some way and assigned them directly to the bitmap (as
        // happens when we allocate a DIB). In this case the assignment operator
        // does not copy the pixels, rather the copied bitmap ends up
        // referencing the same pixels. As the pixels may not live as long as we
        // need it to, we copy the image.
        bitmap->copyTo(&m_state->m_imageBufferClip, SkBitmap::kARGB_8888_Config);
    } else {
        // If there is a pixel ref, we can safely use the assignment operator.
        m_state->m_imageBufferClip = *bitmap;
    }
}

WindowFeatures parseDialogFeatures(const String& dialogFeaturesString, const FloatRect& screenAvailableRect)
{
    auto featuresMap = parseDialogFeaturesMap(dialogFeaturesString);

    // The following features from Microsoft's documentation are not implemented:
    // - default font settings
    // - width, height, left, and top specified in units other than "px"
    // - edge (sunken or raised, default is raised)
    // - dialogHide: trusted && boolFeature(features, "dialoghide"), makes dialog hide when you print
    // - help: boolFeature(features, "help", true), makes help icon appear in dialog (what does it do on Windows?)
    // - unadorned: trusted && boolFeature(features, "unadorned");

    WindowFeatures features;

    features.menuBarVisible = false;
    features.toolBarVisible = false;
    features.locationBarVisible = false;
    features.dialog = true;

    float width = floatFeature(featuresMap, "dialogwidth", 100, screenAvailableRect.width()).valueOr(620); // default here came from frame size of dialog in MacIE
    float height = floatFeature(featuresMap, "dialogheight", 100, screenAvailableRect.height()).valueOr(450); // default here came from frame size of dialog in MacIE

    features.width = width;
    features.height = height;

    features.x = floatFeature(featuresMap, "dialogleft", screenAvailableRect.x(), screenAvailableRect.maxX() - width);
    features.y = floatFeature(featuresMap, "dialogtop", screenAvailableRect.y(), screenAvailableRect.maxY() - height);

    if (boolFeature(featuresMap, "center").valueOr(true)) {
        if (!features.x)
            features.x = screenAvailableRect.x() + (screenAvailableRect.width() - width) / 2;
        if (!features.y)
            features.y = screenAvailableRect.y() + (screenAvailableRect.height() - height) / 2;
    }

    features.resizable = boolFeature(featuresMap, "resizable").valueOr(false);
    features.scrollbarsVisible = boolFeature(featuresMap, "scroll").valueOr(true);
    features.statusBarVisible = boolFeature(featuresMap, "status").valueOr(false);

    return features;
}

static inline FloatPoint rightMostCornerToVector(const FloatRect& rect, const FloatSize& vector)
{
    // Return the corner of the rectangle that if it is to the left of the vector
    // would mean all of the rectangle is to the left of the vector.
    // The vector here represents the side between two points in a clockwise convex polygon.
    //
    //  Q  XXX
    // QQQ XXX   If the lower left corner of X is left of the vector that goes from the top corner of Q to
    //  QQQ      the right corner of Q, then all of X is left of the vector, and intersection impossible.
    //   Q
    //
    FloatPoint point;
    if (vector.width() >= 0)
        point.setY(rect.maxY());
    else
        point.setY(rect.y());
    if (vector.height() >= 0)
        point.setX(rect.x());
    else
        point.setX(rect.maxX());
    return point;
}

bool RenderThemeWinCE::paintMediaMuteButton(RenderObject* o, const PaintInfo& paintInfo, const IntRect& r)
{
    bool rc = paintButton(o, paintInfo, r);
    HTMLMediaElement* mediaElement = mediaElementParent(o->node());
    bool muted = !mediaElement || mediaElement->muted();
    FloatRect imRect = r;
    imRect.inflate(-2);
    paintInfo.context->save();
    paintInfo.context->setStrokeColor(Color::black);
    paintInfo.context->setFillColor(Color::black);
    FloatPoint pts[6] = {
        FloatPoint(imRect.x() + 1, imRect.y() + imRect.height() / 3.0),
        FloatPoint(imRect.x() + 1 + imRect.width() / 2.0, imRect.y() + imRect.height() / 3.0),
        FloatPoint(imRect.maxX() - 1, imRect.y()),
        FloatPoint(imRect.maxX() - 1, imRect.maxY()),
        FloatPoint(imRect.x() + 1 + imRect.width() / 2.0, imRect.y() + 2.0 * imRect.height() / 3.0),
        FloatPoint(imRect.x() + 1, imRect.y() + 2.0 * imRect.height() / 3.0)
    };
    paintInfo.context->drawConvexPolygon(6, pts);
    if (muted)
        paintInfo.context->drawLine(IntPoint(imRect.maxX(), imRect.y()), IntPoint(imRect.x(), imRect.maxY()));
    paintInfo.context->restore();
    return rc;
}

bool FloatRect::contains(const FloatRect& other) const
{
    return x() <= other.x() && maxX() >= other.maxX()
        && y() <= other.y() && maxY() >= other.maxY();
}

bool RenderThemeWinCE::paintMediaPlayButton(RenderObject* o, const PaintInfo& paintInfo, const IntRect& r)
{
    bool rc = paintButton(o, paintInfo, r);
    FloatRect imRect = r;
    imRect.inflate(-3);
    paintInfo.context->save();
    paintInfo.context->setStrokeColor(Color::black);
    paintInfo.context->setFillColor(Color::black);
    HTMLMediaElement* mediaElement = mediaElementParent(o->node());
    bool paused = !mediaElement || mediaElement->paused();
    if (paused) {
        float width = imRect.width();
        imRect.setWidth(width / 3.0);
        paintInfo.context->fillRect(imRect);
        imRect.move(2.0 * width / 3.0, 0);
        paintInfo.context->fillRect(imRect);
    } else {
        FloatPoint pts[3] = { FloatPoint(imRect.x(), imRect.y()), FloatPoint(imRect.maxX(), (imRect.y() + imRect.maxY()) / 2.0), FloatPoint(imRect.x(), imRect.maxY()) };
        paintInfo.context->drawConvexPolygon(3, pts);
    }
    paintInfo.context->restore();
    return rc;
}

FloatRect TileController::computeTileCoverageRect(const FloatSize& newSize, const FloatRect& previousVisibleRect, const FloatRect& visibleRect, float contentsScale) const
{
    // If the page is not in a window (for example if it's in a background tab), we limit the tile coverage rect to the visible rect.
    if (!m_isInWindow)
        return visibleRect;

#if PLATFORM(IOS)
    // FIXME: unify the iOS and Mac code.
    UNUSED_PARAM(previousVisibleRect);
    
    if (m_tileCoverage == CoverageForVisibleArea || MemoryPressureHandler::singleton().isUnderMemoryPressure())
        return visibleRect;

    double horizontalMargin = tileSize().width() / contentsScale;
    double verticalMargin = tileSize().height() / contentsScale;

    double currentTime = monotonicallyIncreasingTime();
    double timeDelta = currentTime - m_velocity.lastUpdateTime;

    FloatRect futureRect = visibleRect;
    futureRect.setLocation(FloatPoint(
        futureRect.location().x() + timeDelta * m_velocity.horizontalVelocity,
        futureRect.location().y() + timeDelta * m_velocity.verticalVelocity));

    if (m_velocity.horizontalVelocity) {
        futureRect.setWidth(futureRect.width() + horizontalMargin);
        if (m_velocity.horizontalVelocity < 0)
            futureRect.setX(futureRect.x() - horizontalMargin);
    }

    if (m_velocity.verticalVelocity) {
        futureRect.setHeight(futureRect.height() + verticalMargin);
        if (m_velocity.verticalVelocity < 0)
            futureRect.setY(futureRect.y() - verticalMargin);
    }

    if (!m_velocity.horizontalVelocity && !m_velocity.verticalVelocity) {
        if (m_velocity.scaleChangeRate > 0)
            return visibleRect;
        futureRect.setWidth(futureRect.width() + horizontalMargin);
        futureRect.setHeight(futureRect.height() + verticalMargin);
        futureRect.setX(futureRect.x() - horizontalMargin / 2);
        futureRect.setY(futureRect.y() - verticalMargin / 2);
    }

    // Can't use m_tileCacheLayer->bounds() here, because the size of the underlying platform layer
    // hasn't been updated for the current commit.
    IntSize contentSize = expandedIntSize(newSize);
    if (futureRect.maxX() > contentSize.width())
        futureRect.setX(contentSize.width() - futureRect.width());
    if (futureRect.maxY() > contentSize.height())
        futureRect.setY(contentSize.height() - futureRect.height());
    if (futureRect.x() < 0)
        futureRect.setX(0);
    if (futureRect.y() < 0)
        futureRect.setY(0);

    return futureRect;
#else
    UNUSED_PARAM(contentsScale);

    // FIXME: look at how far the document can scroll in each dimension.
    float coverageHorizontalSize = visibleRect.width();
    float coverageVerticalSize = visibleRect.height();

    bool largeVisibleRectChange = !previousVisibleRect.isEmpty() && !visibleRect.intersects(previousVisibleRect);

    // Inflate the coverage rect so that it covers 2x of the visible width and 3x of the visible height.
    // These values were chosen because it's more common to have tall pages and to scroll vertically,
    // so we keep more tiles above and below the current area.

    if (m_tileCoverage & CoverageForHorizontalScrolling && !largeVisibleRectChange)
        coverageHorizontalSize *= 2;

    if (m_tileCoverage & CoverageForVerticalScrolling && !largeVisibleRectChange)
        coverageVerticalSize *= 3;

    coverageVerticalSize += topMarginHeight() + bottomMarginHeight();
    coverageHorizontalSize += leftMarginWidth() + rightMarginWidth();

    // Can't use m_tileCacheLayer->bounds() here, because the size of the underlying platform layer
    // hasn't been updated for the current commit.
    FloatRect coverageBounds = boundsForSize(newSize);
    float coverageLeft = visibleRect.x() - (coverageHorizontalSize - visibleRect.width()) / 2;
    coverageLeft = std::min(coverageLeft, coverageBounds.maxX() - coverageHorizontalSize);
    coverageLeft = std::max(coverageLeft, coverageBounds.x());

    float coverageTop = visibleRect.y() - (coverageVerticalSize - visibleRect.height()) / 2;
    coverageTop = std::min(coverageTop, coverageBounds.maxY() - coverageVerticalSize);
    coverageTop = std::max(coverageTop, coverageBounds.y());

    return FloatRect(coverageLeft, coverageTop, coverageHorizontalSize, coverageVerticalSize);
#endif
}

bool FloatRect::intersects(const FloatRect& other) const {
  // Checking emptiness handles negative widths as well as zero.
  return !isEmpty() && !other.isEmpty() && x() < other.maxX() &&
         other.x() < maxX() && y() < other.maxY() && other.y() < maxY();
}

//.........这里部分代码省略.........
            bool treatAsSpace = Font::treatAsSpace(character);
            if (treatAsSpace || (expandAroundIdeographs && Font::isCJKIdeographOrSymbol(character))) {
                // Distribute the run's total expansion evenly over all expansion opportunities in the run.
                if (m_expansion) {
                    float previousExpansion = m_expansion;
                    if (!treatAsSpace && !m_isAfterExpansion) {
                        // Take the expansion opportunity before this ideograph.
                        m_expansion -= m_expansionPerOpportunity;
                        float expansionAtThisOpportunity = !m_run.applyWordRounding() ? m_expansionPerOpportunity : roundf(previousExpansion) - roundf(m_expansion);
                        m_runWidthSoFar += expansionAtThisOpportunity;
                        if (glyphBuffer) {
                            if (glyphBuffer->isEmpty())
                                glyphBuffer->add(fontData->spaceGlyph(), fontData, expansionAtThisOpportunity);
                            else
                                glyphBuffer->expandLastAdvance(expansionAtThisOpportunity);
                        }
                        previousExpansion = m_expansion;
                    }
                    if (m_run.allowsTrailingExpansion() || (m_run.ltr() && textIterator.currentCharacter() + advanceLength < static_cast<size_t>(m_run.length()))
                        || (m_run.rtl() && textIterator.currentCharacter())) {
                        m_expansion -= m_expansionPerOpportunity;
                        width += !m_run.applyWordRounding() ? m_expansionPerOpportunity : roundf(previousExpansion) - roundf(m_expansion);
                        m_isAfterExpansion = true;
                    }
                } else
                    m_isAfterExpansion = false;

                // Account for word spacing.
                // We apply additional space between "words" by adding width to the space character.
                if (treatAsSpace && (character != '\t' || !m_run.allowTabs()) && textIterator.currentCharacter() && m_font->wordSpacing())
                    width += m_font->wordSpacing();
            } else
                m_isAfterExpansion = false;
        }

        if (shouldApplyFontTransforms() && glyphBuffer && Font::treatAsSpace(character))
            charactersTreatedAsSpace.append(make_pair(glyphBuffer->size(),
                OriginalAdvancesForCharacterTreatedAsSpace(character == ' ', glyphBuffer->size() ? glyphBuffer->advanceAt(glyphBuffer->size() - 1) : 0, width)));

        if (m_accountForGlyphBounds) {
            bounds = fontData->boundsForGlyph(glyph);
            if (!textIterator.currentCharacter())
                m_firstGlyphOverflow = max<float>(0, -bounds.x());
        }

        if (m_forTextEmphasis && !Font::canReceiveTextEmphasis(character))
            glyph = 0;

        // Advance past the character we just dealt with.
        textIterator.advance(advanceLength);

        float oldWidth = width;

        // Force characters that are used to determine word boundaries for the rounding hack
        // to be integer width, so following words will start on an integer boundary.
        if (m_run.applyWordRounding() && Font::isRoundingHackCharacter(character)) {
            width = ceilf(width);

            // Since widthSinceLastRounding can lose precision if we include measurements for
            // preceding whitespace, we bypass it here.
            m_runWidthSoFar += width;

            // Since this is a rounding hack character, we should have reset this sum on the previous
            // iteration.
            ASSERT(!widthSinceLastRounding);
        } else {
            // Check to see if the next character is a "rounding hack character", if so, adjust
            // width so that the total run width will be on an integer boundary.
            if ((m_run.applyWordRounding() && textIterator.currentCharacter() < m_run.length() && Font::isRoundingHackCharacter(*(textIterator.characters())))
                || (m_run.applyRunRounding() && textIterator.currentCharacter() >= m_run.length())) {
                float totalWidth = widthSinceLastRounding + width;
                widthSinceLastRounding = ceilf(totalWidth);
                width += widthSinceLastRounding - totalWidth;
                m_runWidthSoFar += widthSinceLastRounding;
                widthSinceLastRounding = 0;
            } else
                widthSinceLastRounding += width;
        }

        if (glyphBuffer)
            glyphBuffer->add(glyph, fontData, (rtl ? oldWidth + lastRoundingWidth : width));

        lastRoundingWidth = width - oldWidth;

        if (m_accountForGlyphBounds) {
            m_maxGlyphBoundingBoxY = max(m_maxGlyphBoundingBoxY, bounds.maxY());
            m_minGlyphBoundingBoxY = min(m_minGlyphBoundingBoxY, bounds.y());
            m_lastGlyphOverflow = max<float>(0, bounds.maxX() - width);
        }
    }

    if (shouldApplyFontTransforms())
        m_runWidthSoFar += applyFontTransforms(glyphBuffer, m_run.ltr(), lastGlyphCount, lastFontData, m_typesettingFeatures, charactersTreatedAsSpace);

    unsigned consumedCharacters = textIterator.currentCharacter() - m_currentCharacter;
    m_currentCharacter = textIterator.currentCharacter();
    m_runWidthSoFar += widthSinceLastRounding;
    m_finalRoundingWidth = lastRoundingWidth;
    return consumedCharacters;
}