C++ FloatPoint::x方法代码示例

void SVGPathSegListBuilder::arcTo(float r1, float r2, float angle, bool largeArcFlag, bool sweepFlag, const FloatPoint& targetPoint, PathCoordinateMode mode)
{
    ASSERT(m_pathElement);
    ASSERT(m_pathSegList);
    if (mode == AbsoluteCoordinates)
        m_pathSegList->appendWithoutByteStreamSync(SVGPathSegArcAbs::create(m_pathElement, targetPoint.x(), targetPoint.y(), r1, r2, angle, largeArcFlag, sweepFlag));
    else
        m_pathSegList->appendWithoutByteStreamSync(SVGPathSegArcRel::create(m_pathElement, targetPoint.x(), targetPoint.y(), r1, r2, angle, largeArcFlag, sweepFlag));
}

LayoutState::LayoutState(std::unique_ptr<LayoutState> next, RenderBox* renderer, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged)
    : m_lineGrid(0)
    , m_next(std::move(next))
#ifndef NDEBUG
    , m_renderer(renderer)
#endif
{
    ASSERT(m_next);

    bool fixed = renderer->isOutOfFlowPositioned() && renderer->style().position() == FixedPosition;
    if (fixed) {
        // FIXME: This doesn't work correctly with transforms.
        FloatPoint fixedOffset = renderer->view().localToAbsolute(FloatPoint(), IsFixed);
        m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
    } else
        m_paintOffset = m_next->m_paintOffset + offset;

    if (renderer->isOutOfFlowPositioned() && !fixed) {
        if (RenderElement* container = renderer->container()) {
            if (container->isInFlowPositioned() && container->isRenderInline())
                m_paintOffset += toRenderInline(container)->offsetForInFlowPositionedInline(renderer);
        }
    }

    m_layoutOffset = m_paintOffset;

    if (renderer->isInFlowPositioned() && renderer->hasLayer())
        m_paintOffset += renderer->layer()->offsetForInFlowPosition();

    m_clipped = !fixed && m_next->m_clipped;
    if (m_clipped)
        m_clipRect = m_next->m_clipRect;

    if (renderer->hasOverflowClip()) {
        LayoutRect clipRect(toLayoutPoint(m_paintOffset) + renderer->view().layoutDelta(), renderer->cachedSizeForOverflowClip());
        if (m_clipped)
            m_clipRect.intersect(clipRect);
        else {
            m_clipRect = clipRect;
            m_clipped = true;
        }

        m_paintOffset -= renderer->scrolledContentOffset();
    }

    // If we establish a new page height, then cache the offset to the top of the first page.
    // We can compare this later on to figure out what part of the page we're actually on,
    if (pageLogicalHeight || renderer->isRenderFlowThread()) {
        m_pageLogicalHeight = pageLogicalHeight;
        bool isFlipped = renderer->style().isFlippedBlocksWritingMode();
        m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? renderer->borderLeft() + renderer->paddingLeft() : renderer->borderRight() + renderer->paddingRight()),
                               m_layoutOffset.height() + (!isFlipped ? renderer->borderTop() + renderer->paddingTop() : renderer->borderBottom() + renderer->paddingBottom()));
        m_pageLogicalHeightChanged = pageLogicalHeightChanged;
        m_isPaginated = true;
    } else {
        // If we don't establish a new page height, then propagate the old page height and offset down.
        m_pageLogicalHeight = m_next->m_pageLogicalHeight;
        m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
        m_pageOffset = m_next->m_pageOffset;
        
        // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
        // writing mode roots.
        if (renderer->isUnsplittableForPagination()) {
            m_pageLogicalHeight = 0;
            m_isPaginated = false;
        } else
            m_isPaginated = m_pageLogicalHeight || renderer->flowThreadContainingBlock();
    }
    
    // Propagate line grid information.
    propagateLineGridInfo(renderer);

    m_layoutDelta = m_next->m_layoutDelta;
#if !ASSERT_DISABLED && ENABLE(SATURATED_LAYOUT_ARITHMETIC)
    m_layoutDeltaXSaturated = m_next->m_layoutDeltaXSaturated;
    m_layoutDeltaYSaturated = m_next->m_layoutDeltaYSaturated;
#endif

    if (lineGrid() && (lineGrid()->style().writingMode() == renderer->style().writingMode()) && renderer->isRenderMultiColumnFlowThread())
        toRenderMultiColumnFlowThread(renderer)->computeLineGridPaginationOrigin(*this);

    // If we have a new grid to track, then add it to our set.
    if (renderer->style().lineGrid() != RenderStyle::initialLineGrid() && renderer->isRenderBlockFlow())
        establishLineGrid(toRenderBlockFlow(renderer));

    // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}

void SVGDocumentExtensions::updatePan(const FloatPoint& pos) const
{
    if (SVGSVGElement* svg = rootElement(*m_document))
        svg->setCurrentTranslate(FloatPoint(pos.x() - m_translate.x(), pos.y() - m_translate.y()));
}

// RenderBox methods will expect coordinates w/o any transforms in coordinates
// relative to our borderBox origin.  This method gives us exactly that.
void RenderSVGRoot::buildLocalToBorderBoxTransform()
{
    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
    float scale = style()->effectiveZoom();
    FloatPoint translate = svg->currentTranslate();
    LayoutSize borderAndPadding(borderLeft() + paddingLeft(), borderTop() + paddingTop());
    m_localToBorderBoxTransform = svg->viewBoxToViewTransform(contentWidth() / scale, contentHeight() / scale);
    if (borderAndPadding.isEmpty() && scale == 1 && translate == FloatPoint::zero())
        return;
    m_localToBorderBoxTransform = AffineTransform(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y()) * m_localToBorderBoxTransform;
}

void ScrollAnimator::setCurrentPosition(const FloatPoint& position)
{
    m_currentPosX = position.x();
    m_currentPosY = position.y();
}

void Path::addArc(const FloatPoint& center, float radius, float startAngle, float endAngle, bool anticlockwise)
{
    // The OpenVG spec says nothing about inf as radius or start/end angle.
    // WebKit seems to pass those (e.g. https://bugs.webkit.org/show_bug.cgi?id=16449),
    // so abort instead of risking undefined behavior.
    if (!isfinite(radius) || !isfinite(startAngle) || !isfinite(endAngle))
        return;

    // For some reason, the HTML 5 spec defines the angle as going clockwise
    // from the positive X axis instead of going standard anticlockwise.
    // So let's make it a proper angle in order to keep sanity.
    startAngle = fmod((2.0 * piDouble) - startAngle, 2.0 * piDouble);
    endAngle = fmod((2.0 * piDouble) - endAngle, 2.0 * piDouble);

    // Make it so that endAngle > startAngle. fmod() above takes care of
    // keeping the difference below 360 degrees.
    if (endAngle <= startAngle)
        endAngle += 2.0 * piDouble;

    const VGfloat angleDelta = anticlockwise
        ? (endAngle - startAngle)
        : (startAngle - endAngle + (2.0 * piDouble));

    // OpenVG uses endpoint parameterization while this method receives its
    // values in center parameterization. It lacks an ellipse rotation
    // parameter so we use 0 for that, and also the radius is only a single
    // value which makes for rh == rv. In order to convert from endpoint to
    // center parameterization, we use the formulas from the OpenVG/SVG specs:

    // (x,y) = (cos rot, -sin rot; sin rot, -cos rot) * (rh * cos angle, rv * sin angle) + (center.x, center.y)
    // rot is 0, which simplifies this a bit:
    // (x,y) = (1, 0; 0, -1) * (rh * cos angle, rv * sin angle) + (center.x, center.y)
    //       = (1 * rh * cos angle + 0 * rv * sin angle, 0 * rh * cos angle + -1 * rv * sin angle) + (center.x, center.y)
    //       = (rh * cos angle, -rv * sin angle) + (center.x, center.y)
    // (Set angle = {startAngle, endAngle} to retrieve the respective endpoints.)

    const VGfloat startX = radius * cos(startAngle) + center.x();
    const VGfloat startY = -radius * sin(startAngle) + center.y();
    const VGfloat endX = radius * cos(endAngle) + center.x();
    const VGfloat endY = -radius * sin(endAngle) + center.y();

    // Fa: large arc flag, makes the difference between SCWARC_TO and LCWARC_TO
    //     respectively SCCWARC_TO and LCCWARC_TO arcs.
    const bool largeArc = (angleDelta > piDouble);

    // Fs: sweep flag, specifying whether the arc is drawn in increasing (true)
    //     or decreasing (0) direction. No need to calculate this value, as it
    //     we already get it passed as a parameter (Fs == !anticlockwise).

    // Translate the large arc and sweep flags into an OpenVG segment command.
    // As OpenVG thinks of everything upside down, we need to reverse the
    // anticlockwise parameter in order to get the specified rotation.
    const VGubyte segmentCommand = !anticlockwise
        ? (largeArc ? VG_LCCWARC_TO_ABS : VG_SCCWARC_TO_ABS)
        : (largeArc ? VG_LCWARC_TO_ABS : VG_SCWARC_TO_ABS);

    // So now, we've got all the parameters in endpoint parameterization format
    // as OpenVG requires it. Which means we can just pass it like this.
    const VGubyte pathSegments[] = {
        hasCurrentPoint() ? VG_LINE_TO_ABS : VG_MOVE_TO_ABS,
        segmentCommand
    };
    const VGfloat pathData[] = {
        startX, startY,
        radius, radius, 0, endX, endY
    };

    m_path->makeCompatibleContextCurrent();
    vgAppendPathData(m_path->vgPath(), 2, pathSegments, pathData);
    ASSERT_VG_NO_ERROR();

    m_path->m_currentPoint.setX(endX);
    m_path->m_currentPoint.setY(endY);
}

void GraphicsContext::drawLineForDocumentMarker(const FloatPoint& point, float width, DocumentMarkerLineStyle style)
{
    if (paintingDisabled())
        return;

    if (style != DocumentMarkerSpellingLineStyle && style != DocumentMarkerGrammarLineStyle)
        return;

    // These are the same for misspelling or bad grammar
    const int patternHeight = 3; // 3 rows
    ASSERT(cMisspellingLineThickness == patternHeight);
    const int patternWidth = 4; // 4 pixels
    ASSERT(patternWidth == cMisspellingLinePatternWidth);

    // Make sure to draw only complete dots.
    // NOTE: Code here used to shift the underline to the left and increase the width
    // to make sure everything gets underlined, but that results in drawing out of
    // bounds (e.g. when at the edge of a view) and could make it appear that the
    // space between adjacent misspelled words was underlined.
    // allow slightly more considering that the pattern ends with a transparent pixel
    float widthMod = fmodf(width, patternWidth);
    if (patternWidth - widthMod > cMisspellingLinePatternGapWidth)
        width -= widthMod;

    // Draw the underline
    CGContextRef context = platformContext();
    CGContextSaveGState(context);

    const Color& patternColor = style == DocumentMarkerGrammarLineStyle ? grammarPatternColor() : spellingPatternColor();
    setCGStrokeColor(context, patternColor);

    wkSetPatternPhaseInUserSpace(context, point);
    CGContextSetBlendMode(context, kCGBlendModeNormal);

    // 3 rows, each offset by half a pixel for blending purposes
    const CGPoint upperPoints [] = {{point.x(), point.y() + patternHeight - 2.5 }, {point.x() + width, point.y() + patternHeight - 2.5}};
    const CGPoint middlePoints [] = {{point.x(), point.y() + patternHeight - 1.5 }, {point.x() + width, point.y() + patternHeight - 1.5}};
    const CGPoint lowerPoints [] = {{point.x(), point.y() + patternHeight - 0.5 }, {point.x() + width, point.y() + patternHeight - 0.5 }};

    // Dash lengths for the top and bottom of the error underline are the same.
    // These are magic.
    static const CGFloat edge_dash_lengths[] = {2.0f, 2.0f};
    static const CGFloat middle_dash_lengths[] = { 2.76f, 1.24f };
    static const CGFloat edge_offset = -(edge_dash_lengths[1] - 1.0f) / 2.0f;
    static const CGFloat middle_offset = -(middle_dash_lengths[1] - 1.0f) / 2.0f;

    // Line opacities.  Once again, these are magic.
    const float upperOpacity = 0.33f;
    const float middleOpacity = 0.75f;
    const float lowerOpacity = 0.88f;

    //Top line
    CGContextSetLineDash(context, edge_offset, edge_dash_lengths, WTF_ARRAY_LENGTH(edge_dash_lengths));
    CGContextSetAlpha(context, upperOpacity);
    CGContextStrokeLineSegments(context, upperPoints, 2);

    // Middle line
    CGContextSetLineDash(context, middle_offset, middle_dash_lengths, WTF_ARRAY_LENGTH(middle_dash_lengths));
    CGContextSetAlpha(context, middleOpacity);
    CGContextStrokeLineSegments(context, middlePoints, 2);

    // Bottom line
    CGContextSetLineDash(context, edge_offset, edge_dash_lengths, WTF_ARRAY_LENGTH(edge_dash_lengths));
    CGContextSetAlpha(context, lowerOpacity);
    CGContextStrokeLineSegments(context, lowerPoints, 2);

    CGContextRestoreGState(context);
}

void drawTextWithSpacing(GraphicsContext* graphicsContext, const SimpleFontData* font, const wxColour& color, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point)
{
    graphicsContext->save();
    
    wxGCDC* dc = static_cast<wxGCDC*>(graphicsContext->platformContext());

    wxFont* wxfont = font->getWxFont();
    graphicsContext->setFillColor(graphicsContext->fillColor(), DeviceColorSpace);

    CGContextRef cgContext = static_cast<CGContextRef>(dc->GetGraphicsContext()->GetNativeContext());

    CGFontRef cgFont;

#ifdef wxOSX_USE_CORE_TEXT && wxOSX_USE_CORE_TEXT
    cgFont = CTFontCopyGraphicsFont((CTFontRef)wxfont->OSXGetCTFont(), NULL);
#else
    ATSFontRef fontRef;
    
    fontRef = FMGetATSFontRefFromFont(wxfont->MacGetATSUFontID());
    
    if (fontRef)
        cgFont = CGFontCreateWithPlatformFont((void*)&fontRef);
#endif
    
    CGContextSetFont(cgContext, cgFont);

    CGContextSetFontSize(cgContext, wxfont->GetPointSize());

    CGFloat red, green, blue, alpha;
    graphicsContext->fillColor().getRGBA(red, green, blue, alpha);
    CGContextSetRGBFillColor(cgContext, red, green, blue, alpha);

    CGAffineTransform matrix = CGAffineTransformIdentity;
    matrix.b = -matrix.b;
    matrix.d = -matrix.d;
    
    CGContextSetTextMatrix(cgContext, matrix);

    CGContextSetTextPosition(cgContext, point.x(), point.y());
    
    const FloatSize* advanceSizes = static_cast<const FloatSize*>(glyphBuffer.advances(from));
    int size = glyphBuffer.size() - from;
    CGSize sizes[size];
    CGGlyph glyphs[numGlyphs];
    
    // if the function doesn't exist, we're probably on tiger and need to grab the
    // function under its old name, CGFontGetGlyphsForUnicodes
    if (!CGFontGetGlyphsForUnichars)
        CGFontGetGlyphsForUnichars = (CGFontGetGlyphsForUnicharsPtr)dlsym(RTLD_DEFAULT, "CGFontGetGlyphsForUnicodes");
    
    // Let's make sure we got the function under one name or another!
    ASSERT(CGFontGetGlyphsForUnichars);
    CGFontGetGlyphsForUnichars(cgFont, glyphBuffer.glyphs(from), glyphs, numGlyphs);
    
    for (int i = 0; i < size; i++) {
        FloatSize fsize = advanceSizes[i];
        sizes[i] = CGSizeMake(fsize.width(), fsize.height());
    }
    
    CGContextShowGlyphsWithAdvances(cgContext, glyphs, sizes, numGlyphs);
    
    if (cgFont)
        CGFontRelease(cgFont);
    graphicsContext->restore();
}

// RenderBox methods will expect coordinates w/o any transforms in coordinates
// relative to our borderBox origin.  This method gives us exactly that.
void RenderSVGRoot::buildLocalToBorderBoxTransform()
{
    SVGSVGElement* svg = toSVGSVGElement(node());
    ASSERT(svg);
    float scale = style()->effectiveZoom();
    FloatPoint translate = svg->currentTranslate();
    LayoutSize borderAndPadding(borderLeft() + paddingLeft(), borderTop() + paddingTop());
    m_localToBorderBoxTransform = svg->viewBoxToViewTransform(contentWidth() / scale, contentHeight() / scale);
    AffineTransform viewToBorderBoxTransform(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());
    if (viewToBorderBoxTransform.isIdentity())
        return;
    m_localToBorderBoxTransform = viewToBorderBoxTransform * m_localToBorderBoxTransform;
}

void Font::drawGlyphs(GraphicsContext* gc, const SimpleFontData* font,
    const GlyphBuffer& glyphBuffer, unsigned from, unsigned numGlyphs,
    const FloatPoint& point, const FloatRect& textRect) const
{
    SkScalar x = SkFloatToScalar(point.x());
    SkScalar y = SkFloatToScalar(point.y());

// ENABLE_OPENTYPE_VERTICAL is not enabled on MACOSX
#if !OS(MACOSX)
    const OpenTypeVerticalData* verticalData = font->verticalData();
    if (font->platformData().orientation() == Vertical && verticalData) {
        SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
        SkPoint* pos = storage.get();

        AffineTransform savedMatrix = gc->getCTM();
        gc->concatCTM(AffineTransform(0, -1, 1, 0, point.x(), point.y()));
        gc->concatCTM(AffineTransform(1, 0, 0, 1, -point.x(), -point.y()));

        const unsigned kMaxBufferLength = 256;
        Vector<FloatPoint, kMaxBufferLength> translations;

        const FontMetrics& metrics = font->fontMetrics();
        SkScalar verticalOriginX = SkFloatToScalar(point.x() + metrics.floatAscent() - metrics.floatAscent(IdeographicBaseline));
        float horizontalOffset = point.x();

        unsigned glyphIndex = 0;
        while (glyphIndex < numGlyphs) {
            unsigned chunkLength = std::min(kMaxBufferLength, numGlyphs - glyphIndex);

            const Glyph* glyphs = glyphBuffer.glyphs(from + glyphIndex);
            translations.resize(chunkLength);
            verticalData->getVerticalTranslationsForGlyphs(font, &glyphs[0], chunkLength, reinterpret_cast<float*>(&translations[0]));

            x = verticalOriginX;
            y = SkFloatToScalar(point.y() + horizontalOffset - point.x());

            float currentWidth = 0;
            for (unsigned i = 0; i < chunkLength; ++i, ++glyphIndex) {
                pos[i].set(
                    x + SkIntToScalar(lroundf(translations[i].x())),
                    y + -SkIntToScalar(-lroundf(currentWidth - translations[i].y())));
                currentWidth += glyphBuffer.advanceAt(from + glyphIndex);
            }
            horizontalOffset += currentWidth;
            paintGlyphs(gc, font, glyphs, chunkLength, pos, textRect);
        }

        gc->setCTM(savedMatrix);
        return;
    }
#endif

    if (!glyphBuffer.hasOffsets()) {
        SkAutoSTMalloc<64, SkScalar> storage(numGlyphs);
        SkScalar* xpos = storage.get();
        const float* adv = glyphBuffer.advances(from);
        for (unsigned i = 0; i < numGlyphs; i++) {
            xpos[i] = x;
            x += SkFloatToScalar(adv[i]);
        }
        const Glyph* glyphs = glyphBuffer.glyphs(from);
        paintGlyphsHorizontal(gc, font, glyphs, numGlyphs, xpos, SkFloatToScalar(y), textRect);
        return;
    }

    // FIXME: text rendering speed:
    // Android has code in their WebCore fork to special case when the
    // GlyphBuffer has no advances other than the defaults. In that case the
    // text drawing can proceed faster. However, it's unclear when those
    // patches may be upstreamed to WebKit so we always use the slower path
    // here.
    SkAutoSTMalloc<32, SkPoint> storage(numGlyphs);
    SkPoint* pos = storage.get();
    const FloatSize* offsets = glyphBuffer.offsets(from);
    const float* advances = glyphBuffer.advances(from);
    SkScalar advanceSoFar = SkFloatToScalar(0);
    for (unsigned i = 0; i < numGlyphs; i++) {
        pos[i].set(
            x + SkFloatToScalar(offsets[i].width()) + advanceSoFar,
            y + SkFloatToScalar(offsets[i].height()));
        advanceSoFar += SkFloatToScalar(advances[i]);
    }

    const Glyph* glyphs = glyphBuffer.glyphs(from);
    paintGlyphs(gc, font, glyphs, numGlyphs, pos, textRect);
}

void drawTextWithSpacing(GraphicsContext* graphicsContext, const SimpleFontData* font, const wxColour& color, const GlyphBuffer& glyphBuffer, int from, int numGlyphs, const FloatPoint& point)
{
#if USE(WXGC)
    wxGCDC* dc = static_cast<wxGCDC*>(graphicsContext->platformContext());
    wxGraphicsContext* gc = dc->GetGraphicsContext();
    gc->PushState();
    cairo_t* cr = (cairo_t*)gc->GetNativeContext();

    wxFont* wxfont = font->getWxFont();
    cairo_scaled_font_t* scaled_font = 0;
#if wxUSE_PANGO
    PangoFont* pangoFont = createPangoFontForFont(wxfont);
    PangoFontMap* fontMap = pangoFontMap();
    PangoContext* pangoContext = pango_cairo_font_map_create_context(PANGO_CAIRO_FONT_MAP(fontMap));
    scaled_font = createScaledFontForFont(wxfont); 
#elif __WXMSW__
    cairo_matrix_t sizeMatrix, ctm;
    cairo_matrix_init_identity(&ctm);
    int size = font->platformData().size();
    cairo_matrix_init_scale(&sizeMatrix, size, size);

    cairo_font_options_t* fontOptions = cairo_font_options_create();
    cairo_font_options_set_antialias(fontOptions, CAIRO_ANTIALIAS_SUBPIXEL);
    
    cairo_font_face_t* win_face = cairo_win32_font_face_create_for_hfont((HFONT)wxfont->GetHFONT());
    scaled_font = cairo_scaled_font_create(win_face, &sizeMatrix, &ctm, fontOptions); 
#endif
    ASSERT(scaled_font);

    GlyphBufferGlyph* glyphs = const_cast<GlyphBufferGlyph*>(glyphBuffer.glyphs(from));
    float offset = point.x();

    for (int i = 0; i < numGlyphs; i++) {
#if wxUSE_PANGO
        glyphs[i].index = pango_font_get_glyph(pangoFont, pangoContext, glyphBuffer.glyphAt(from + i));
#endif
        glyphs[i].x = offset;
        glyphs[i].y = point.y();
        offset += glyphBuffer.advanceAt(from + i);
    }

    cairo_set_source_rgba(cr, color.Red()/255.0, color.Green()/255.0, color.Blue()/255.0, color.Alpha()/255.0);
    cairo_set_scaled_font(cr, scaled_font);
    
    cairo_show_glyphs(cr, glyphs, numGlyphs);

    cairo_scaled_font_destroy(scaled_font);
    gc->PopState();
#else
    wxDC* dc = graphicsContext->platformContext();

    wxFont* wxfont = font->getWxFont();
    if (wxfont && wxfont->IsOk())
        dc->SetFont(*wxfont);
    dc->SetTextForeground(color);

    // convert glyphs to wxString
    GlyphBufferGlyph* glyphs = const_cast<GlyphBufferGlyph*>(glyphBuffer.glyphs(from));
    int offset = point.x();
    wxString text = wxEmptyString;
    for (unsigned i = 0; i < numGlyphs; i++) {
        text = text.Append((wxChar)glyphs[i]);
        offset += glyphBuffer.advanceAt(from + i);
    }
    
    // the y point is actually the bottom point of the text, turn it into the top
    float height = font->ascent() - font->descent();
    wxCoord ypoint = (wxCoord) (point.y() - height);
     
    dc->DrawText(text, (wxCoord)point.x(), ypoint);
#endif
}

void ScrollAnimator::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
{
    m_currentPosX = offset.x();
    m_currentPosY = offset.y();
    notifyPositionChanged();
}

void Image::drawPattern(GraphicsContext* ctxt, const FloatRect& tileRect, const AffineTransform& patternTransform,
                        const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator op, const FloatRect& destRect)
{
    if (!nativeImageForCurrentFrame())
        return;

    ASSERT(patternTransform.isInvertible());
    if (!patternTransform.isInvertible())
        // Avoid a hang under CGContextDrawTiledImage on release builds.
        return;

    CGContextRef context = ctxt->platformContext();
    GraphicsContextStateSaver stateSaver(*ctxt);
    CGContextClipToRect(context, destRect);
    ctxt->setCompositeOperation(op);
    CGContextTranslateCTM(context, destRect.x(), destRect.y() + destRect.height());
    CGContextScaleCTM(context, 1, -1);

    // Compute the scaled tile size.
    float scaledTileHeight = tileRect.height() * narrowPrecisionToFloat(patternTransform.d());

    // We have to adjust the phase to deal with the fact we're in Cartesian space now (with the bottom left corner of destRect being
    // the origin).
    float adjustedX = phase.x() - destRect.x() + tileRect.x() * narrowPrecisionToFloat(patternTransform.a()); // We translated the context so that destRect.x() is the origin, so subtract it out.
    float adjustedY = destRect.height() - (phase.y() - destRect.y() + tileRect.y() * narrowPrecisionToFloat(patternTransform.d()) + scaledTileHeight);

    CGImageRef tileImage = nativeImageForCurrentFrame();
    float h = CGImageGetHeight(tileImage);

    RetainPtr<CGImageRef> subImage;
    if (tileRect.size() == size())
        subImage = tileImage;
    else {
        // Copying a sub-image out of a partially-decoded image stops the decoding of the original image. It should never happen
        // because sub-images are only used for border-image, which only renders when the image is fully decoded.
        ASSERT(h == height());
        subImage.adoptCF(CGImageCreateWithImageInRect(tileImage, tileRect));
    }

    // Adjust the color space.
    subImage = imageWithColorSpace(subImage.get(), styleColorSpace);

    // Leopard has an optimized call for the tiling of image patterns, but we can only use it if the image has been decoded enough that
    // its buffer is the same size as the overall image.  Because a partially decoded CGImageRef with a smaller width or height than the
    // overall image buffer needs to tile with "gaps", we can't use the optimized tiling call in that case.
    // FIXME: We cannot use CGContextDrawTiledImage with scaled tiles on Leopard, because it suffers from rounding errors.  Snow Leopard is ok.
    float scaledTileWidth = tileRect.width() * narrowPrecisionToFloat(patternTransform.a());
    float w = CGImageGetWidth(tileImage);
#ifdef BUILDING_ON_LEOPARD
    if (w == size().width() && h == size().height() && scaledTileWidth == tileRect.width() && scaledTileHeight == tileRect.height())
#else
    if (w == size().width() && h == size().height())
#endif
        CGContextDrawTiledImage(context, FloatRect(adjustedX, adjustedY, scaledTileWidth, scaledTileHeight), subImage.get());
    else {

        // On Leopard and newer, this code now only runs for partially decoded images whose buffers do not yet match the overall size of the image.
        static const CGPatternCallbacks patternCallbacks = { 0, drawPatternCallback, NULL };
        CGAffineTransform matrix = CGAffineTransformMake(narrowPrecisionToCGFloat(patternTransform.a()), 0, 0, narrowPrecisionToCGFloat(patternTransform.d()), adjustedX, adjustedY);
        matrix = CGAffineTransformConcat(matrix, CGContextGetCTM(context));
        // The top of a partially-decoded image is drawn at the bottom of the tile. Map it to the top.
        matrix = CGAffineTransformTranslate(matrix, 0, size().height() - h);
        RetainPtr<CGPatternRef> pattern(AdoptCF, CGPatternCreate(subImage.get(), CGRectMake(0, 0, tileRect.width(), tileRect.height()),
                                        matrix, tileRect.width(), tileRect.height(),
                                        kCGPatternTilingConstantSpacing, true, &patternCallbacks));
        if (!pattern)
            return;

        RetainPtr<CGColorSpaceRef> patternSpace(AdoptCF, CGColorSpaceCreatePattern(0));

        CGFloat alpha = 1;
        RetainPtr<CGColorRef> color(AdoptCF, CGColorCreateWithPattern(patternSpace.get(), pattern.get(), &alpha));
        CGContextSetFillColorSpace(context, patternSpace.get());

        // FIXME: Really want a public API for this.  It is just CGContextSetBaseCTM(context, CGAffineTransformIdentiy).
        //wkSetPatternBaseCTM(context, CGAffineTransformIdentity);
        CGContextSetPatternPhase(context, CGSizeZero);

        CGContextSetFillColorWithColor(context, color.get());
        CGContextFillRect(context, CGContextGetClipBoundingBox(context));

    }

    stateSaver.restore();

    if (imageObserver())
        imageObserver()->didDraw(this);
}

void SVGDocumentExtensions::startPan(const FloatPoint& start)
{
    if (SVGSVGElement* svg = rootElement(*m_document))
        m_translate = FloatPoint(start.x() - svg->currentTranslate().x(), start.y() - svg->currentTranslate().y());
}

void Image::drawPattern(GraphicsContext* context,
                        const FloatRect& floatSrcRect,
                        const AffineTransform& patternTransform,
                        const FloatPoint& phase,
                        ColorSpace styleColorSpace,
                        CompositeOperator compositeOp,
                        const FloatRect& destRect,
                        BlendMode)
{
    TRACE_EVENT0("skia", "Image::drawPattern");
    RefPtr<NativeImageSkia> bitmap = nativeImageForCurrentFrame();
    if (!bitmap)
        return;

    FloatRect normSrcRect = normalizeRect(floatSrcRect);
    normSrcRect.intersect(FloatRect(0, 0, bitmap->bitmap().width(), bitmap->bitmap().height()));
    if (destRect.isEmpty() || normSrcRect.isEmpty())
        return; // nothing to draw

    SkMatrix ctm = context->platformContext()->getTotalMatrix();
    SkMatrix totalMatrix;
    totalMatrix.setConcat(ctm, patternTransform);

    // Figure out what size the bitmap will be in the destination. The
    // destination rect is the bounds of the pattern, we need to use the
    // matrix to see how big it will be.
    SkRect destRectTarget;
    totalMatrix.mapRect(&destRectTarget, normSrcRect);

    float destBitmapWidth = SkScalarToFloat(destRectTarget.width());
    float destBitmapHeight = SkScalarToFloat(destRectTarget.height());

    // Compute the resampling mode.
    ResamplingMode resampling;
    if (context->isAccelerated() || context->printing())
        resampling = RESAMPLE_LINEAR;
    else
        resampling = computeResamplingMode(totalMatrix, *bitmap, normSrcRect.width(), normSrcRect.height(), destBitmapWidth, destBitmapHeight);
    resampling = limitResamplingMode(context->platformContext(), resampling);

    // Load the transform WebKit requested.
    SkMatrix matrix(patternTransform);

    SkShader* shader;
    if (resampling == RESAMPLE_AWESOME) {
        // Do nice resampling.
        float scaleX = destBitmapWidth / normSrcRect.width();
        float scaleY = destBitmapHeight / normSrcRect.height();
        SkRect scaledSrcRect;
        SkIRect enclosingScaledSrcRect;

        // The image fragment generated here is not exactly what is
        // requested. The scale factor used is approximated and image
        // fragment is slightly larger to align to integer
        // boundaries.
        SkBitmap resampled = extractScaledImageFragment(*bitmap, normSrcRect, scaleX, scaleY, &scaledSrcRect, &enclosingScaledSrcRect);
        shader = SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);

        // Since we just resized the bitmap, we need to remove the scale
        // applied to the pixels in the bitmap shader. This means we need
        // CTM * patternTransform to have identity scale. Since we
        // can't modify CTM (or the rectangle will be drawn in the wrong
        // place), we must set patternTransform's scale to the inverse of
        // CTM scale.
        matrix.setScaleX(ctm.getScaleX() ? 1 / ctm.getScaleX() : 1);
        matrix.setScaleY(ctm.getScaleY() ? 1 / ctm.getScaleY() : 1);
    } else {
        // No need to do nice resampling.
        SkBitmap srcSubset;
        bitmap->bitmap().extractSubset(&srcSubset, enclosingIntRect(normSrcRect));
        shader = SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
    }

    // We also need to translate it such that the origin of the pattern is the
    // origin of the destination rect, which is what WebKit expects. Skia uses
    // the coordinate system origin as the base for the patter. If WebKit wants
    // a shifted image, it will shift it from there using the patternTransform.
    float adjustedX = phase.x() + normSrcRect.x() *
                      narrowPrecisionToFloat(patternTransform.a());
    float adjustedY = phase.y() + normSrcRect.y() *
                      narrowPrecisionToFloat(patternTransform.d());
    matrix.postTranslate(SkFloatToScalar(adjustedX),
                         SkFloatToScalar(adjustedY));
    shader->setLocalMatrix(matrix);

    SkPaint paint;
    paint.setShader(shader)->unref();
    paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp));
    paint.setFilterBitmap(resampling == RESAMPLE_LINEAR);

    context->drawRect(destRect, paint);
}