Merge in WebKit r47029.

1 files changed, 1930 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/wince/GraphicsContextWince.cpp b/WebCore/platform/graphics/wince/GraphicsContextWince.cpp
new file mode 100644
index 0000000..c114c0e
--- /dev/null
+++ b/WebCore/platform/graphics/wince/GraphicsContextWince.cpp
@@ -0,0 +1,1930 @@
+/*
+ *  Copyright (C) 2007-2009 Torch Mobile Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+#include "GraphicsContext.h"
+
+#include "CharacterNames.h"
+#include "GlyphBuffer.h"
+#include "Gradient.h"
+#include "GraphicsContextPrivate.h"
+#include "NotImplemented.h"
+#include "Path.h"
+#include "PlatformPathWince.h"
+#include "SharedBitmap.h"
+#include "SimpleFontData.h"
+#include "TransformationMatrix.h"
+#include <wtf/OwnPtr.h>
+
+#include <windows.h>
+
+namespace WebCore {
+
+typedef void (*FuncGradientFillRectLinear)(HDC hdc, const IntRect& r, const IntPoint& p0, const IntPoint& p1, const Vector<Gradient::ColorStop>& stops);
+typedef void (*FuncGradientFillRectRadial)(HDC hdc, const IntRect& r, const IntPoint& p0, const IntPoint& p1, float r0, float r1, const Vector<Gradient::ColorStop>& stops);
+FuncGradientFillRectLinear g_linearGradientFiller = 0;
+FuncGradientFillRectRadial g_radialGradientFiller = 0;
+
+static inline bool isZero(double d)
+{
+    return d > 0 ? d <= 1.E-10 : d >= -1.E-10;
+}
+
+// stableRound rounds -0.5 to 0, where lround rounds -0.5 to -1.
+static inline int stableRound(double d)
+{
+    if (d > 0)
+        return static_cast<int>(d + 0.5);
+
+    int i = static_cast<int>(d);
+    return i - d > 0.5 ? i - 1 : i;
+}
+
+// Unlike enclosingIntRect(), this function does strict rounding.
+static inline IntRect roundRect(const FloatRect& r)
+{
+    return IntRect(stableRound(r.x()), stableRound(r.y()), stableRound(r.right()) - stableRound(r.x()), stableRound(r.bottom()) - stableRound(r.y()));
+}
+
+// Rotation transformation
+class RotationTransform {
+public:
+    RotationTransform()
+        : m_cosA(1.)
+        , m_sinA(0.)
+        , m_preShiftX(0)
+        , m_preShiftY(0)
+        , m_postShiftX(0)
+        , m_postShiftY(0)
+    {
+    }
+    RotationTransform operator-() const
+    {
+        RotationTransform rtn;
+        rtn.m_cosA = m_cosA;
+        rtn.m_sinA = -m_sinA;
+        rtn.m_preShiftX = m_postShiftX;
+        rtn.m_preShiftY = m_postShiftY;
+        rtn.m_postShiftX = m_preShiftX;
+        rtn.m_postShiftY = m_preShiftY;
+        return rtn;
+    }
+    void map(double x1, double y1, double* x2, double* y2) const
+    {
+        x1 += m_preShiftX;
+        y1 += m_preShiftY;
+        *x2 = x1 * m_cosA + y1 * m_sinA + m_postShiftX;
+        *y2 = y1 * m_cosA - x1 * m_sinA + m_postShiftY;
+    }
+    void map(int x1, int y1, int* x2, int* y2) const
+    {
+        x1 += m_preShiftX;
+        y1 += m_preShiftY;
+        *x2 = stableRound(x1 * m_cosA + y1 * m_sinA) + m_postShiftX;
+        *y2 = stableRound(y1 * m_cosA - x1 * m_sinA) + m_postShiftY;
+    }
+
+    double m_cosA;
+    double m_sinA;
+    int m_preShiftX;
+    int m_preShiftY;
+    int m_postShiftX;
+    int m_postShiftY;
+};
+
+template<class T> static inline IntPoint mapPoint(const IntPoint& p, const T& t)
+{
+    int x, y;
+    t.map(p.x(), p.y(), &x, &y);
+    return IntPoint(x, y);
+}
+
+template<class T> static inline FloatPoint mapPoint(const FloatPoint& p, const T& t)
+{
+    double x, y;
+    t.map(p.x(), p.y(), &x, &y);
+    return FloatPoint(static_cast<float>(x), static_cast<float>(y));
+}
+
+template<class Transform, class Rect, class Value> static inline Rect mapRect(const Rect& rect, const Transform& transform)
+{
+    Value x[4], y[4];
+    Value l, t, r, b;
+    r = rect.right() - 1;
+    b = rect.bottom() - 1;
+    transform.map(rect.x(), rect.y(), x, y);
+    transform.map(rect.x(), b, x + 1, y + 1);
+    transform.map(r, b, x + 2, y + 2);
+    transform.map(r, rect.y(), x + 3, y + 3);
+    l = r = x[3];
+    t = b = y[3];
+    for (int i = 0; i < 3; ++i) {
+        if (x[i] < l)
+            l = x[i];
+        else if (x[i] > r)
+            r = x[i];
+
+        if (y[i] < t)
+            t = y[i];
+        else if (y[i] > b)
+            b = y[i];
+    }
+
+    return IntRect(l, t, r - l + 1, b - t + 1);
+}
+
+template<class T> static inline IntRect mapRect(const IntRect& rect, const T& transform)
+{
+    return mapRect<T, IntRect, int>(rect, transform);
+}
+
+template<class T> static inline FloatRect mapRect(const FloatRect& rect, const T& transform)
+{
+    return mapRect<T, FloatRect, double>(rect, transform);
+}
+
+class GraphicsContextPlatformPrivateData {
+public:
+    GraphicsContextPlatformPrivateData()
+        : m_transform()
+        , m_opacity(1.0)
+    {
+    }
+
+    TransformationMatrix m_transform;
+    float m_opacity;
+    Vector<Path> m_paths;
+};
+
+enum AlphaPaintType {
+    AlphaPaintNone,
+    AlphaPaintImage,
+    AlphaPaintOther,
+};
+
+class GraphicsContextPlatformPrivate : public GraphicsContextPlatformPrivateData {
+public:
+    GraphicsContextPlatformPrivate(HDC dc)
+        : m_dc(dc)
+    {
+    }
+    ~GraphicsContextPlatformPrivate()
+    {
+        while (!m_backupData.isEmpty())
+            restore();
+    }
+
+    IntPoint origin() const
+    {
+        return IntPoint(stableRound(-m_transform.e()), stableRound(-m_transform.f()));
+    }
+
+    void translate(float x, float y)
+    {
+        m_transform.translate(x, y);
+    }
+
+    void scale(const FloatSize& size)
+    {
+        m_transform.scaleNonUniform(size.width(), size.height());
+    }
+
+    void rotate(float radians)
+    {
+        m_transform.rotate(rad2deg(radians));
+    }
+
+    void  concatCTM(const TransformationMatrix& transform)
+    {
+        m_transform = transform * m_transform;
+    }
+
+    IntRect mapRect(const IntRect& rect) const
+    {
+        return m_transform.mapRect(rect);
+    }
+
+    FloatRect mapRect(const FloatRect& rect) const
+    {
+        return m_transform.mapRect(rect);
+    }
+
+    IntPoint mapPoint(const IntPoint& point) const
+    {
+        return m_transform.mapPoint(point);
+    }
+
+    FloatPoint mapPoint(const FloatPoint& point) const
+    {
+        return m_transform.mapPoint(point);
+    }
+
+    FloatSize mapSize(const FloatSize& size) const
+    {
+        double w, h;
+        m_transform.map(size.width(), size.height(), w, h);
+        return FloatSize(static_cast<float>(w), static_cast<float>(h));
+    }
+
+    void save()
+    {
+        if (m_dc)
+            SaveDC(m_dc);
+
+        m_backupData.append(*static_cast<GraphicsContextPlatformPrivateData*>(this));
+    }
+
+    void restore()
+    {
+        if (m_backupData.isEmpty())
+            return;
+
+        if (m_dc)
+            RestoreDC(m_dc, -1);
+
+        GraphicsContextPlatformPrivateData::operator=(m_backupData.last());
+        m_backupData.removeLast();
+    }
+
+    bool hasAlpha() const { return m_bitmap && m_bitmap->hasAlpha(); }
+
+    PassRefPtr<SharedBitmap> getTransparentLayerBitmap(IntRect& origRect, AlphaPaintType alphaPaint, RECT& bmpRect, bool checkClipBox, bool force) const
+    {
+        if (m_opacity <= 0)
+            return 0;
+
+        if (force || m_opacity < 1.)  {
+            if (checkClipBox) {
+                RECT clipBox;
+                int clipType = GetClipBox(m_dc, &clipBox);
+                if (clipType == SIMPLEREGION || clipType == COMPLEXREGION)
+                    origRect.intersect(clipBox);
+                if (origRect.isEmpty())
+                    return 0;
+            }
+
+            RefPtr<SharedBitmap> bmp = SharedBitmap::createInstance(alphaPaint == AlphaPaintNone, origRect.width(), origRect.height(), false);
+            SetRect(&bmpRect, 0, 0, origRect.width(), origRect.height());
+            if (bmp) {
+                switch (alphaPaint) {
+                case AlphaPaintNone:
+                case AlphaPaintImage:
+                    {
+                        SharedBitmap::DCHolder dc(bmp.get());
+                        if (dc.get()) {
+                            BitBlt(dc.get(), 0, 0, origRect.width(), origRect.height(), m_dc, origRect.x(), origRect.y(), SRCCOPY);
+                            if (bmp->is32bit() && (!m_bitmap || m_bitmap->is16bit())) {
+                                // Set alpha channel
+                                unsigned* pixels = (unsigned*)bmp->bytes();
+                                const unsigned* const pixelsEnd = pixels + bmp->bitmapInfo().numPixels();
+                                while (pixels < pixelsEnd) {
+                                    *pixels |= 0xFF000000;
+                                    ++pixels;
+                                }
+                            }
+                            return bmp;
+                        }
+                    }
+                    break;
+                //case AlphaPaintOther:
+                default:
+                    memset(bmp->bytes(), 0xFF, bmp->bitmapInfo().numPixels() * 4);
+                    return bmp;
+                    break;
+                }
+            }
+        }
+
+        bmpRect = origRect;
+        return 0;
+    }
+
+    void paintBackTransparentLayerBitmap(HDC hdc, SharedBitmap* bmp, const IntRect& origRect, AlphaPaintType alphaPaint, const RECT& bmpRect)
+    {
+        if (hdc == m_dc)
+            return;
+
+#if !defined(NO_ALPHABLEND)
+        if (alphaPaint == AlphaPaintOther) {
+            ASSERT(bmp && bmp->bytes() && bmp->is32bit());
+            unsigned* pixels = (unsigned*)bmp->bytes();
+            const unsigned* const pixelsEnd = pixels + bmp->bitmapInfo().numPixels();
+            while (pixels < pixelsEnd) {
+                *pixels ^= 0xFF000000;
+                ++pixels;
+            }
+        }
+        if (m_opacity < 1. || alphaPaint == AlphaPaintOther) {
+            const BLENDFUNCTION blend = { AC_SRC_OVER, 0
+                , m_opacity >= 1. ? 255 : (BYTE)(m_opacity * 255)
+                , alphaPaint == AlphaPaintNone ? 0 : AC_SRC_ALPHA };
+            AlphaBlend(m_dc, origRect.x(), origRect.y(), origRect.width(), origRect.height(), hdc, 0, 0, bmpRect.right, bmpRect.bottom, blend);
+        } else
+#endif
+            StretchBlt(m_dc, origRect.x(), origRect.y(), origRect.width(), origRect.height(), hdc, 0, 0, bmpRect.right, bmpRect.bottom, SRCCOPY);
+    }
+
+    HDC m_dc;
+    RefPtr<SharedBitmap> m_bitmap;
+    Vector<GraphicsContextPlatformPrivateData> m_backupData;
+};
+
+static HPEN createPen(const Color& col, double fWidth, StrokeStyle style)
+{
+    int width = stableRound(fWidth);
+    if (width < 1)
+        width = 1;
+
+    int penStyle = PS_NULL;
+    switch (style) {
+        case SolidStroke:
+            penStyle = PS_SOLID;
+            break;
+        case DottedStroke:  // not supported on Windows CE
+        case DashedStroke:
+            penStyle = PS_DASH;
+            width = 1;
+            break;
+        default:
+            break;
+    }
+
+    return CreatePen(penStyle, width, RGB(col.red(), col.green(), col.blue()));
+}
+
+static inline HGDIOBJ createBrush(const Color& col)
+{
+    return CreateSolidBrush(RGB(col.red(), col.green(), col.blue()));
+}
+
+template <typename PixelType, bool Is16bit> static void _rotateBitmap(SharedBitmap* destBmp, const SharedBitmap* sourceBmp, const RotationTransform& transform)
+{
+    int destW = destBmp->width();
+    int destH = destBmp->height();
+    int sourceW = sourceBmp->width();
+    int sourceH = sourceBmp->height();
+    PixelType* dest = (PixelType*)destBmp->bytes();
+    const PixelType* source = (const PixelType*)sourceBmp->bytes();
+    int padding;
+    int paddedSourceW;
+    if (Is16bit) {
+        padding = destW & 1;
+        paddedSourceW = sourceW + (sourceW & 1);
+    } else {
+        padding = 0;
+        paddedSourceW = sourceW;
+    }
+    if (isZero(transform.m_sinA)) {
+        int cosA = transform.m_cosA > 0 ? 1 : -1;
+        for (int y = 0; y < destH; ++y) {
+            for (int x = 0; x < destW; ++x) {
+                int x1 = x + transform.m_preShiftX;
+                int y1 = y + transform.m_preShiftY;
+                int srcX = x1 * cosA + transform.m_postShiftX;
+                int srcY = y1 * cosA - transform.m_postShiftY;
+                if (srcX >= 0 && srcX <= sourceW && srcY >= 0 && srcY <= sourceH)
+                    *dest++ = source[srcY * paddedSourceW + srcX] | 0xFF000000;
+                else
+                    *dest++ |= 0xFF;
+            }
+            dest += padding;
+        }
+    } else if (isZero(transform.m_cosA)) {
+        int sinA = transform.m_sinA > 0 ? 1 : -1;
+        for (int y = 0; y < destH; ++y) {
+            for (int x = 0; x < destW; ++x) {
+                int x1 = x + transform.m_preShiftX;
+                int y1 = y + transform.m_preShiftY;
+                int srcX = y1 * sinA + transform.m_postShiftX;
+                int srcY = -x1 * sinA + transform.m_postShiftY;
+                if (srcX >= 0 && srcX <= sourceW && srcY >= 0 && srcY <= sourceH)
+                    *dest++ = source[srcY * paddedSourceW + srcX];
+            }
+            dest += padding;
+        }
+    } else {
+        for (int y = 0; y < destH; ++y) {
+            for (int x = 0; x < destW; ++x) {
+                // FIXME: for best quality, we should get weighted sum of four neighbours,
+                // but that will be too expensive
+                int srcX, srcY;
+                transform.map(x, y, &srcX, &srcY);
+                if (srcX >= 0 && srcX <= sourceW && srcY >= 0 && srcY <= sourceH)
+                    *dest++ = source[srcY * paddedSourceW + srcX];
+            }
+            dest += padding;
+        }
+    }
+}
+
+static void rotateBitmap(SharedBitmap* destBmp, const SharedBitmap* sourceBmp, const RotationTransform& transform)
+{
+    ASSERT(destBmp->is16bit() == sourceBmp->is16bit());
+    if (destBmp->is16bit())
+        _rotateBitmap<unsigned short, true>(destBmp, sourceBmp, transform);
+    else
+        _rotateBitmap<unsigned, false>(destBmp, sourceBmp, transform);
+}
+
+class TransparentLayerDC : Noncopyable {
+public:
+    TransparentLayerDC(GraphicsContextPlatformPrivate* data, IntRect& origRect, const IntRect* rectBeforeTransform = 0, int alpha = 255, bool paintImage = false);
+    ~TransparentLayerDC();
+
+    HDC hdc() const { return m_memDc; }
+    const RECT& rect() const { return m_bmpRect; }
+    IntSize toShift() const { return IntSize(m_bmpRect.left - m_origRect.x(), m_bmpRect.top - m_origRect.y()); }
+    void fillAlphaChannel();
+
+private:
+    GraphicsContextPlatformPrivate* m_data;
+    IntRect m_origRect;
+    IntRect m_rotatedOrigRect;
+    HDC m_memDc;
+    RefPtr<SharedBitmap> m_bitmap;
+    RefPtr<SharedBitmap> m_rotatedBitmap;
+    RECT m_bmpRect;
+    unsigned m_key1;
+    unsigned m_key2;
+    RotationTransform m_rotation;
+    float m_oldOpacity;
+    AlphaPaintType m_alphaPaintType;
+};
+
+TransparentLayerDC::TransparentLayerDC(GraphicsContextPlatformPrivate* data, IntRect& origRect, const IntRect* rectBeforeTransform, int alpha, bool paintImage)
+: m_data(data)
+, m_origRect(origRect)
+, m_oldOpacity(data->m_opacity)
+// m_key1 and m_key2 are not initalized here. They are used only in the case that
+// SharedBitmap::getDC() is called, I.E., when m_bitmap is not null.
+{
+    m_data->m_opacity *= alpha / 255.;
+    bool mustCreateLayer;
+    if (!m_data->hasAlpha()) {
+        mustCreateLayer = false;
+        m_alphaPaintType = AlphaPaintNone;
+    } else {
+        mustCreateLayer = true;
+        m_alphaPaintType = paintImage ? AlphaPaintImage : AlphaPaintOther;
+    }
+    if (rectBeforeTransform && !isZero(m_data->m_transform.b())) {
+        m_rotatedOrigRect = origRect;
+        m_rotatedBitmap = m_data->getTransparentLayerBitmap(m_rotatedOrigRect, m_alphaPaintType, m_bmpRect, false, true);
+        if (m_rotatedBitmap) {
+            double a = m_data->m_transform.a();
+            double b = m_data->m_transform.b();
+            double c = _hypot(a, b);
+            m_rotation.m_cosA = a / c;
+            m_rotation.m_sinA = b / c;
+
+            int centerX = origRect.x() + origRect.width() / 2;
+            int centerY = origRect.y() + origRect.height() / 2;
+            m_rotation.m_preShiftX = -centerX;
+            m_rotation.m_preShiftY = -centerY;
+            m_rotation.m_postShiftX = centerX;
+            m_rotation.m_postShiftY = centerY;
+
+            m_origRect = mapRect(m_rotatedOrigRect, m_rotation);
+
+            m_rotation.m_preShiftX += m_rotatedOrigRect.x();
+            m_rotation.m_preShiftY += m_rotatedOrigRect.y();
+            m_rotation.m_postShiftX -= m_origRect.x();
+            m_rotation.m_postShiftY -= m_origRect.y();
+
+            FloatPoint topLeft = m_data->m_transform.mapPoint(FloatPoint(rectBeforeTransform->topLeft()));
+            FloatPoint topRight(rectBeforeTransform->right() - 1, rectBeforeTransform->y());
+            topRight = m_data->m_transform.mapPoint(topRight);
+            FloatPoint bottomLeft(rectBeforeTransform->x(), rectBeforeTransform->bottom() - 1);
+            bottomLeft = m_data->m_transform.mapPoint(bottomLeft);
+            FloatSize sideTop = topRight - topLeft;
+            FloatSize sideLeft = bottomLeft - topLeft;
+            float width = _hypot(sideTop.width() + 1, sideTop.height() + 1);
+            float height = _hypot(sideLeft.width() + 1, sideLeft.height() + 1);
+
+            origRect.inflateX(stableRound((width - origRect.width()) * 0.5));
+            origRect.inflateY(stableRound((height - origRect.height()) * 0.5));
+
+            m_bitmap = SharedBitmap::createInstance(m_rotatedBitmap->is16bit(), m_origRect.width(), m_origRect.height(), true);
+            if (m_bitmap)
+                rotateBitmap(m_bitmap.get(), m_rotatedBitmap.get(), -m_rotation);
+            else
+                m_rotatedBitmap = 0;
+        }
+    } else
+        m_bitmap = m_data->getTransparentLayerBitmap(m_origRect, m_alphaPaintType, m_bmpRect, true, mustCreateLayer);
+    if (m_bitmap)
+        m_memDc = m_bitmap->getDC(&m_key1, &m_key2);
+    else
+        m_memDc = m_data->m_dc;
+}
+
+TransparentLayerDC::~TransparentLayerDC()
+{
+    if (m_rotatedBitmap) {
+        m_bitmap->releaseDC(m_memDc, m_key1, m_key2);
+        m_key1 = m_key2 = 0;
+        rotateBitmap(m_rotatedBitmap.get(), m_bitmap.get(), m_rotation);
+        m_memDc = m_rotatedBitmap->getDC(&m_key1, &m_key2);
+        m_data->paintBackTransparentLayerBitmap(m_memDc, m_rotatedBitmap.get(), m_rotatedOrigRect, m_alphaPaintType, m_bmpRect);
+        m_rotatedBitmap->releaseDC(m_memDc, m_key1, m_key2);
+    } else if (m_bitmap) {
+        m_data->paintBackTransparentLayerBitmap(m_memDc, m_bitmap.get(), m_origRect, m_alphaPaintType, m_bmpRect);
+        m_bitmap->releaseDC(m_memDc, m_key1, m_key2);
+    }
+    m_data->m_opacity = m_oldOpacity;
+}
+
+void TransparentLayerDC::fillAlphaChannel()
+{
+    if (!m_bitmap || !m_bitmap->is32bit())
+        return;
+
+    unsigned* pixels = (unsigned*)m_bitmap->bytes();
+    const unsigned* const pixelsEnd = pixels + m_bitmap->bitmapInfo().numPixels();
+    while (pixels < pixelsEnd) {
+        *pixels |= 0xFF000000;
+        ++pixels;
+    }
+}
+
+class ScopeDCProvider : Noncopyable {
+public:
+    explicit ScopeDCProvider(GraphicsContextPlatformPrivate* data)
+        : m_data(data)
+    {
+        if (m_data->m_bitmap)
+            m_data->m_dc = m_data->m_bitmap->getDC(&m_key1, &m_key2);
+    }
+    ~ScopeDCProvider()
+    {
+        if (m_data->m_bitmap) {
+            m_data->m_bitmap->releaseDC(m_data->m_dc, m_key1, m_key2);
+            m_data->m_dc = 0;
+        }
+    }
+private:
+    GraphicsContextPlatformPrivate* m_data;
+    unsigned m_key1;
+    unsigned m_key2;
+};
+
+
+GraphicsContext::GraphicsContext(PlatformGraphicsContext* dc)
+: m_common(createGraphicsContextPrivate())
+, m_data(new GraphicsContextPlatformPrivate(dc))
+{
+}
+
+GraphicsContext::~GraphicsContext()
+{
+    destroyGraphicsContextPrivate(m_common);
+    delete m_data;
+}
+
+void GraphicsContext::setBitmap(PassRefPtr<SharedBitmap> bmp)
+{
+    ASSERT(!m_data->m_dc);
+    m_data->m_bitmap = bmp;
+}
+
+HDC GraphicsContext::getWindowsContext(const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap)
+{
+    notImplemented();
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+void GraphicsContext::releaseWindowsContext(HDC hdc, const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap)
+{
+    notImplemented();
+    ASSERT_NOT_REACHED();
+}
+
+void GraphicsContext::savePlatformState()
+{
+    m_data->save();
+}
+
+void GraphicsContext::restorePlatformState()
+{
+    m_data->restore();
+}
+
+void GraphicsContext::drawRect(const IntRect& rect)
+{
+    if (!m_data->m_opacity || paintingDisabled() || rect.isEmpty())
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+    TransparentLayerDC transparentDC(m_data, trRect, &rect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    HGDIOBJ brush = 0;
+    HGDIOBJ oldBrush;
+    if (fillColor().alpha()) {
+        brush = createBrush(fillColor());
+        oldBrush = SelectObject(dc, brush);
+    } else
+        SelectObject(dc, GetStockObject(NULL_BRUSH));
+
+    HGDIOBJ pen = 0;
+    HGDIOBJ oldPen;
+    if (strokeStyle() != NoStroke) {
+        pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+        oldPen = SelectObject(dc, pen);
+    } else
+        SelectObject(dc, GetStockObject(NULL_PEN));
+
+    if (!brush && !pen)
+        return;
+
+    if (trRect.width() <= 0)
+        trRect.setWidth(1);
+    if (trRect.height() <= 0)
+        trRect.setHeight(1);
+
+    Rectangle(dc, trRect.x(), trRect.y(), trRect.right(), trRect.bottom());
+
+    if (pen) {
+        SelectObject(dc, oldPen);
+        DeleteObject(pen);
+    }
+
+    if (brush) {
+        SelectObject(dc, oldBrush);
+        DeleteObject(brush);
+    }
+}
+
+void GraphicsContext::drawLine(const IntPoint& point1, const IntPoint& point2)
+{
+    if (!m_data->m_opacity || paintingDisabled() || strokeStyle() == NoStroke || !strokeColor().alpha())
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntPoint trPoint1 = m_data->mapPoint(point1);
+    IntPoint trPoint2 = m_data->mapPoint(point2);
+
+    IntRect lineRect(trPoint1, trPoint2 - trPoint1);
+    lineRect.setHeight(lineRect.height() + strokeThickness());
+    TransparentLayerDC transparentDC(m_data, lineRect, 0, strokeColor().alpha());
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trPoint1 += transparentDC.toShift();
+    trPoint2 += transparentDC.toShift();
+
+    HGDIOBJ pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+    HGDIOBJ oldPen = SelectObject(dc, pen);
+
+    MoveToEx(dc, trPoint1.x(), trPoint1.y(), 0);
+    LineTo(dc, trPoint2.x(), trPoint2.y());
+
+    SelectObject(dc, oldPen);
+    DeleteObject(pen);
+}
+
+void GraphicsContext::drawEllipse(const IntRect& rect)
+{
+    if (!m_data->m_opacity || paintingDisabled() || (!fillColor().alpha() && strokeStyle() == NoStroke))
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+    TransparentLayerDC transparentDC(m_data, trRect, &rect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    HGDIOBJ brush = 0;
+    HGDIOBJ oldBrush;
+    if (fillColor().alpha()) {
+        brush = createBrush(fillColor());
+        oldBrush = SelectObject(dc, brush);
+    } else
+        SelectObject(dc, GetStockObject(NULL_BRUSH));
+    HGDIOBJ pen = 0;
+    HGDIOBJ oldPen;
+    if (strokeStyle() != NoStroke) {
+        pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+        oldPen = SelectObject(dc, pen);
+    } else
+        SelectObject(dc, GetStockObject(NULL_PEN));
+
+    Ellipse(dc, trRect.x(), trRect.y(), trRect.right(), trRect.bottom());
+
+    if (pen) {
+        SelectObject(dc, oldPen);
+        DeleteObject(pen);
+    }
+
+    if (brush) {
+        SelectObject(dc, oldBrush);
+        DeleteObject(brush);
+    }
+}
+
+static inline bool equalAngle(double a, double b) 
+{
+    return fabs(a - b) < 1E-5;
+}
+
+void getEllipsePointByAngle(double angle, double a, double b, float& x, float& y)
+{
+    while (angle < 0)
+        angle += 2 * piDouble;
+    while (angle >= 2 * piDouble)
+        angle -= 2 * piDouble;
+
+    if (equalAngle(angle, 0) || equalAngle(angle, 2 * piDouble)) {
+        x = a;
+        y = 0;
+    } else if (equalAngle(angle, piDouble)) {
+        x = -a;
+        y = 0;
+    } else if (equalAngle(angle, .5 * piDouble)) {
+        x = 0;
+        y = b;
+    } else if (equalAngle(angle, 1.5 * piDouble)) {
+        x = 0;
+        y = -b;
+    } else {
+        double k = tan(angle);
+        double sqA = a * a;
+        double sqB = b * b;
+        double tmp = 1. / (1. / sqA + (k * k) / sqB);
+        tmp = tmp <= 0 ? 0 : sqrt(tmp);
+        if (angle > .5 * piDouble && angle < 1.5 * piDouble)
+            tmp = -tmp;
+        x = tmp;
+
+        k = tan(.5 * piDouble - angle);
+        tmp = 1. / ((k * k) / sqA + 1 / sqB);
+        tmp = tmp <= 0 ? 0 : sqrt(tmp);
+        if (angle > piDouble)
+            tmp = -tmp;
+        y = tmp;
+    }
+}
+
+void GraphicsContext::strokeArc(const IntRect& rect, int startAngle, int angleSpan)
+{
+    if (!m_data->m_opacity || paintingDisabled() || strokeStyle() == NoStroke || rect.isEmpty())
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+    TransparentLayerDC transparentDC(m_data, trRect, &rect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    HGDIOBJ pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+    HGDIOBJ oldPen = SelectObject(dc, pen);
+
+    double a = trRect.width() * 0.5;
+    double b = trRect.height() * 0.5;
+    int centerX = stableRound(trRect.x() + a);
+    int centerY = stableRound(trRect.y() + b);
+    float fstartX, fstartY, fendX, fendY;
+    int startX, startY, endX, endY;
+    getEllipsePointByAngle(deg2rad((double)startAngle), a, b, fstartX, fstartY);
+    getEllipsePointByAngle(deg2rad((double)startAngle + angleSpan), a, b, fendX, fendY);
+    startX = stableRound(fstartX);
+    startY = stableRound(fstartY);
+    endX = stableRound(fendX);
+    endY = stableRound(fendY);
+
+    startX += centerX;
+    startY = centerY - startY;
+    endX += centerX;
+    endY = centerY - endY;
+    RECT clipRect;
+    if (startX < endX) {
+        clipRect.left = startX;
+        clipRect.right = endX;
+    } else {
+        clipRect.left = endX;
+        clipRect.right = startX;
+    }
+    if (startY < endY) {
+        clipRect.top = startY;
+        clipRect.bottom = endY;
+    } else {
+        clipRect.top = endY;
+        clipRect.bottom = startY;
+    }
+
+    OwnPtr<HRGN> clipRgn(CreateRectRgn(0, 0, 0, 0));
+    bool newClip;
+    if (GetClipRgn(dc, clipRgn.get()) <= 0) {
+        newClip = true;
+        clipRgn.set(CreateRectRgn(clipRect.left, clipRect.top, clipRect.right, clipRect.bottom));
+        SelectClipRgn(dc, clipRgn.get());
+    } else {
+        newClip = false;
+        IntersectClipRect(dc, clipRect.left, clipRect.top, clipRect.right, clipRect.bottom);
+    }
+
+    HGDIOBJ oldBrush = SelectObject(dc, GetStockObject(NULL_BRUSH));
+    Ellipse(dc, trRect.x(), trRect.y(), trRect.right(), trRect.bottom());
+    SelectObject(dc, oldBrush);
+
+    if (newClip)
+        SelectClipRgn(dc, 0);
+    else
+        SelectClipRgn(dc, clipRgn.get());
+
+    SelectObject(dc, oldPen);
+    DeleteObject(pen);
+}
+
+void GraphicsContext::drawConvexPolygon(size_t npoints, const FloatPoint* points, bool shouldAntialias)
+{
+    if (!m_data->m_opacity || paintingDisabled() || npoints <= 1 || !points)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    Vector<POINT, 20> winPoints(npoints);
+    FloatPoint trPoint = m_data->mapPoint(points[0]);
+    winPoints[0].x = stableRound(trPoint.x());
+    winPoints[0].y = stableRound(trPoint.y());
+    RECT rect = { winPoints[0].x, winPoints[0].y, winPoints[0].x, winPoints[0].y };
+    for (size_t i = 1; i < npoints; ++i) {
+        trPoint = m_data->mapPoint(points[i]);
+        winPoints[i].x = stableRound(trPoint.x());
+        winPoints[i].y = stableRound(trPoint.y());
+        if (rect.left > winPoints[i].x)
+            rect.left = winPoints[i].x;
+        else if (rect.right < winPoints[i].x)
+            rect.right = winPoints[i].x;
+        if (rect.top > winPoints[i].y)
+            rect.top = winPoints[i].y;
+        else if (rect.bottom < winPoints[i].y)
+            rect.bottom = winPoints[i].y;
+    }
+    rect.bottom += 1;
+    rect.right += 1;
+
+    IntRect intRect(rect);
+    TransparentLayerDC transparentDC(m_data, intRect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+
+    for (size_t i = 0; i < npoints; ++i) {
+        winPoints[i].x += transparentDC.toShift().width();
+        winPoints[i].y += transparentDC.toShift().height();
+    }
+
+    HGDIOBJ brush = 0;
+    HGDIOBJ oldBrush;
+    if (fillColor().alpha()) {
+        brush = createBrush(fillColor());
+        oldBrush = SelectObject(dc, brush);
+    } else
+        SelectObject(dc, GetStockObject(NULL_BRUSH));
+
+    HGDIOBJ pen = 0;
+    HGDIOBJ oldPen;
+    if (strokeStyle() != NoStroke) {
+        pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+        oldPen = SelectObject(dc, pen);
+    } else
+        SelectObject(dc, GetStockObject(NULL_PEN));
+
+    if (!brush && !pen)
+        return;
+
+    Polygon(dc, winPoints.data(), npoints);
+
+    if (pen) {
+        SelectObject(dc, oldPen);
+        DeleteObject(pen);
+    }
+
+    if (brush) {
+        SelectObject(dc, oldBrush);
+        DeleteObject(brush);
+    }
+}
+
+void GraphicsContext::fillRect(const FloatRect& rect, const Color& color)
+{
+    if (paintingDisabled() || !m_data->m_opacity)
+        return;
+
+    int alpha = color.alpha();
+    if (!alpha)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect intRect = enclosingIntRect(rect);
+    TransparentLayerDC transparentDC(m_data, m_data->mapRect(intRect), &intRect, alpha);
+
+    if (!transparentDC.hdc())
+        return;
+
+    OwnPtr<HBRUSH> hbrush(CreateSolidBrush(RGB(color.red(), color.green(), color.blue())));
+    FillRect(transparentDC.hdc(), &transparentDC.rect(), hbrush.get());
+}
+
+void GraphicsContext::clip(const FloatRect& rect)
+{
+    if (paintingDisabled())
+        return;
+
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = enclosingIntRect(m_data->mapRect(rect));
+
+    OwnPtr<HRGN> clipRgn(CreateRectRgn(0, 0, 0, 0));
+    if (GetClipRgn(m_data->m_dc, clipRgn.get()) > 0)
+        IntersectClipRect(m_data->m_dc, trRect.x(), trRect.y(), trRect.right(), trRect.bottom());
+    else {
+        clipRgn.set(CreateRectRgn(trRect.x(), trRect.y(), trRect.right(), trRect.bottom()));
+        SelectClipRgn(m_data->m_dc, clipRgn.get());
+    }
+}
+
+void GraphicsContext::clipOut(const IntRect& rect)
+{
+    if (paintingDisabled())
+        return;
+
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+
+    ExcludeClipRect(m_data->m_dc, trRect.x(), trRect.y(), trRect.right(), trRect.bottom());
+}
+
+void GraphicsContext::drawFocusRing(const Color& color)
+{
+    if (!m_data->m_opacity || paintingDisabled())
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    int radius = (focusRingWidth() - 1) / 2;
+    int offset = radius + focusRingOffset();
+
+    const Vector<IntRect>& rects = focusRingRects();
+    unsigned rectCount = rects.size();
+    IntRect finalFocusRect;
+    for (unsigned i = 0; i < rectCount; i++) {
+        IntRect focusRect = rects[i];
+        focusRect.inflate(offset);
+        finalFocusRect.unite(focusRect);
+    }
+
+    IntRect intRect = finalFocusRect;
+    IntRect trRect = m_data->mapRect(finalFocusRect);
+    TransparentLayerDC transparentDC(m_data, trRect, &intRect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    RECT rect = trRect;
+    DrawFocusRect(dc, &rect);
+}
+
+void GraphicsContext::drawLineForText(const IntPoint& origin, int width, bool printing)
+{
+    if (paintingDisabled())
+        return;
+
+    StrokeStyle oldStyle = strokeStyle();
+    setStrokeStyle(SolidStroke);
+    drawLine(origin, origin + IntSize(width, 0));
+    setStrokeStyle(oldStyle);
+}
+
+void GraphicsContext::drawLineForMisspellingOrBadGrammar(const IntPoint&, int width, bool grammar)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setPlatformFillColor(const Color& col)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setPlatformStrokeColor(const Color& col)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setPlatformStrokeThickness(float strokeThickness)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setURLForRect(const KURL& link, const IntRect& destRect)
+{
+    notImplemented();
+}
+
+void GraphicsContext::addInnerRoundedRectClip(const IntRect& rect, int thickness)
+{
+    // We can only clip rectangles on WINCE
+    clip(rect);
+}
+
+void GraphicsContext::clearRect(const FloatRect& rect)
+{
+    if (paintingDisabled())
+        return;
+
+    if (m_data->hasAlpha()) {
+        IntRect trRect = enclosingIntRect(m_data->mapRect(rect));
+        m_data->m_bitmap->clearPixels(trRect);
+        return;
+    } 
+
+    fillRect(rect, Color(Color::white));
+}
+
+void GraphicsContext::strokeRect(const FloatRect& rect, float width)
+{
+    if (!m_data->m_opacity || paintingDisabled() || strokeStyle() == NoStroke)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect intRect = enclosingIntRect(rect);
+    IntRect trRect = m_data->mapRect(intRect);
+    TransparentLayerDC transparentDC(m_data, trRect, &intRect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    HGDIOBJ pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+    HGDIOBJ oldPen = SelectObject(dc, pen);
+
+    int right = trRect.right() - 1;
+    int bottom = trRect.bottom() - 1;
+    const POINT intPoints[5] =
+    {
+        { trRect.x(), trRect.y() },
+        { right, trRect.y() },
+        { right, bottom },
+        { trRect.x(), bottom },
+        { trRect.x(), trRect.y() }
+    };
+
+    Polyline(dc, intPoints, 5);
+
+    SelectObject(dc, oldPen);
+    DeleteObject(pen);
+}
+
+void GraphicsContext::beginTransparencyLayer(float opacity)
+{
+    m_data->save();
+    m_data->m_opacity *= opacity;
+}
+
+void GraphicsContext::endTransparencyLayer()
+{
+    m_data->restore();
+}
+
+void GraphicsContext::concatCTM(const TransformationMatrix& transform)
+{
+    m_data->concatCTM(transform);
+}
+
+TransformationMatrix& GraphicsContext::affineTransform()
+{
+    return m_data->m_transform;
+}
+
+const TransformationMatrix& GraphicsContext::affineTransform() const
+{
+    return m_data->m_transform;
+}
+
+void GraphicsContext::resetAffineTransform()
+{
+    m_data->m_transform.makeIdentity();
+}
+
+void GraphicsContext::translate(float x, float y)
+{
+    m_data->translate(x, y);
+}
+
+void GraphicsContext::rotate(float radians)
+{
+    m_data->rotate(radians);
+}
+
+IntPoint GraphicsContext::origin()
+{
+    return m_data->origin();
+}
+
+void GraphicsContext::scale(const FloatSize& size)
+{
+    m_data->scale(size);
+}
+
+void GraphicsContext::setLineCap(LineCap lineCap)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setLineJoin(LineJoin lineJoin)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setMiterLimit(float miter)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setAlpha(float alpha)
+{
+    m_data->m_opacity = alpha;
+}
+
+void GraphicsContext::setCompositeOperation(CompositeOperator op)
+{
+    notImplemented();
+}
+
+void GraphicsContext::beginPath()
+{
+    m_data->m_paths.clear();
+}
+
+void GraphicsContext::addPath(const Path& path)
+{
+    m_data->m_paths.append(path);
+}
+
+void GraphicsContext::clip(const Path& path)
+{
+    notImplemented();
+}
+
+void GraphicsContext::clipOut(const Path&)
+{
+    notImplemented();
+}
+
+void GraphicsContext::clipOutEllipseInRect(const IntRect&)
+{
+    notImplemented();
+}
+
+static inline IntPoint rectCenterPoint(const RECT& rect)
+{
+    return IntPoint(rect.left + (rect.right - rect.left) / 2, rect.top + (rect.bottom - rect.top) / 2);
+}
+void GraphicsContext::fillRoundedRect(const IntRect& fillRect, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight, const Color& c)
+{
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntSize shadowSize;
+    int shadowBlur = 0;
+    Color shadowColor;
+        
+    getShadow(shadowSize, shadowBlur, shadowColor);
+    
+    IntRect dstRect = fillRect;
+    
+    dstRect.move(shadowSize);
+    dstRect.inflate(shadowBlur);
+    dstRect = m_data->mapRect(dstRect);
+  
+    FloatSize newTopLeft(m_data->mapSize(topLeft));
+    FloatSize newTopRight(m_data->mapSize(topRight));
+    FloatSize newBottomLeft(m_data->mapSize(bottomLeft));
+    FloatSize newBottomRight(m_data->mapSize(bottomRight));
+
+    TransparentLayerDC transparentDc(m_data, dstRect, &fillRect);
+    HDC dc = transparentDc.hdc();
+    if (!dc)
+        return;
+
+    dstRect.move(transparentDc.toShift());
+
+    RECT rectWin = dstRect;
+
+    HGDIOBJ brush = createBrush(shadowColor);
+    HGDIOBJ oldBrush = SelectObject(dc, brush);
+   
+    SelectObject(dc, GetStockObject(NULL_PEN));
+
+    IntPoint centerPoint = rectCenterPoint(rectWin);
+    // Draw top left half
+    RECT clipRect(rectWin);
+    clipRect.right = centerPoint.x();
+    clipRect.bottom = centerPoint.y();
+
+    OwnPtr<HRGN> clipRgn(CreateRectRgn(0, 0, 0, 0));
+    bool needsNewClip = (GetClipRgn(dc, clipRgn.get()) <= 0);
+    
+    drawRoundCorner(needsNewClip, clipRect, rectWin, dc, stableRound(newTopLeft.width() * 2), stableRound(newTopLeft.height() * 2));
+
+    // Draw top right
+    clipRect = rectWin;
+    clipRect.left = centerPoint.x();
+    clipRect.bottom = centerPoint.y();
+
+    drawRoundCorner(needsNewClip, clipRect, rectWin, dc, stableRound(newTopRight.width() * 2), stableRound(newTopRight.height() * 2));
+
+     // Draw bottom left
+    clipRect = rectWin;
+    clipRect.right = centerPoint.x();
+    clipRect.top = centerPoint.y();
+
+    drawRoundCorner(needsNewClip, clipRect, rectWin, dc, stableRound(newBottomLeft.width() * 2), stableRound(newBottomLeft.height() * 2));
+
+    // Draw bottom right
+    clipRect = rectWin;
+    clipRect.left = centerPoint.x();
+    clipRect.top = centerPoint.y();
+
+    drawRoundCorner(needsNewClip, clipRect, rectWin, dc, stableRound(newBottomRight.width() * 2), stableRound(newBottomRight.height() * 2));
+
+    SelectObject(dc, oldBrush);
+    DeleteObject(brush);
+}
+
+
+void GraphicsContext::drawRoundCorner(bool needsNewClip, RECT clipRect, RECT rectWin, HDC dc, int width, int height)
+{
+    if (!dc)
+        return;
+
+    OwnPtr<HRGN> clipRgn(CreateRectRgn(0, 0, 0, 0));
+    if (needsNewClip)  {
+        clipRgn.set(CreateRectRgn(clipRect.left, clipRect.top, clipRect.right, clipRect.bottom));
+        SelectClipRgn(dc, clipRgn.get());
+    } else 
+        IntersectClipRect(dc, clipRect.left, clipRect.top, clipRect.right, clipRect.bottom);
+    
+    ::RoundRect(dc, rectWin.left , rectWin.top , rectWin.right , rectWin.bottom , width, height);
+    
+    SelectClipRgn(dc, needsNewClip ? 0 : clipRgn.get());
+}
+
+
+FloatRect GraphicsContext::roundToDevicePixels(const FloatRect& frect)
+{
+    notImplemented();
+    return frect;
+}
+
+Color gradientAverageColor(const Gradient* gradient)
+{
+    const Vector<Gradient::ColorStop>& stops = gradient->getStops();
+    if (stops.isEmpty())
+        return Color();
+
+    const Gradient::ColorStop& stop = stops.first();
+    if (stops.size() == 1)
+        return Color(stop.red, stop.green, stop.blue, stop.alpha);
+
+    const Gradient::ColorStop& lastStop = stops.last();
+    return Color((stop.red + lastStop.red) * 0.5f
+        , (stop.green + lastStop.green) * 0.5f
+        , (stop.blue + lastStop.blue) * 0.5f
+        , (stop.alpha + lastStop.alpha) * 0.5f);
+}
+
+void GraphicsContext::fillPath()
+{
+    Color c = m_common->state.fillColorSpace == GradientColorSpace && m_common->state.fillGradient
+        ? gradientAverageColor(m_common->state.fillGradient.get())
+        : fillColor();
+
+    if (!c.alpha() || !m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    if (m_data->m_opacity < 1.0f || m_data->hasAlpha()) {
+        HGDIOBJ brush = createBrush(c);
+        for (Vector<Path>::const_iterator i = m_data->m_paths.begin(); i != m_data->m_paths.end(); ++i) {
+            IntRect trRect = enclosingIntRect(m_data->mapRect(i->boundingRect()));
+            trRect.inflate(1);
+            TransparentLayerDC transparentDC(m_data, trRect);
+            HDC dc = transparentDC.hdc();
+            if (!dc)
+                continue;
+
+            TransformationMatrix tr = m_data->m_transform;
+            tr.translate(transparentDC.toShift().width(), transparentDC.toShift().height());
+
+            SelectObject(dc, GetStockObject(NULL_PEN));
+            HGDIOBJ oldBrush = SelectObject(dc, brush);
+            i->platformPath()->fillPath(dc, &tr);
+            SelectObject(dc, oldBrush);
+        }
+        DeleteObject(brush);
+    } else {
+        SelectObject(m_data->m_dc, GetStockObject(NULL_PEN));
+        HGDIOBJ brush = createBrush(c);
+        HGDIOBJ oldBrush = SelectObject(m_data->m_dc, brush);
+        for (Vector<Path>::const_iterator i = m_data->m_paths.begin(); i != m_data->m_paths.end(); ++i)
+            i->platformPath()->fillPath(m_data->m_dc, &m_data->m_transform);
+        SelectObject(m_data->m_dc, oldBrush);
+        DeleteObject(brush);
+    }
+}
+
+
+void GraphicsContext::strokePath()
+{
+    if (!m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    if (m_data->m_opacity < 1.0f || m_data->hasAlpha()) {
+        HGDIOBJ pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+        for (Vector<Path>::const_iterator i = m_data->m_paths.begin(); i != m_data->m_paths.end(); ++i) {
+            IntRect trRect = enclosingIntRect(m_data->mapRect(i->boundingRect()));
+            trRect.inflate(1);
+            TransparentLayerDC transparentDC(m_data, trRect);
+            HDC dc = transparentDC.hdc();
+            if (!dc)
+                continue;
+
+            TransformationMatrix tr = m_data->m_transform;
+            tr.translate(transparentDC.toShift().width(), transparentDC.toShift().height());
+
+            SelectObject(dc, GetStockObject(NULL_BRUSH));
+            HGDIOBJ oldPen = SelectObject(dc, pen);
+            i->platformPath()->strokePath(dc, &tr);
+            SelectObject(dc, oldPen);
+        }
+        DeleteObject(pen);
+    } else {
+        SelectObject(m_data->m_dc, GetStockObject(NULL_BRUSH));
+        HGDIOBJ pen = createPen(strokeColor(), strokeThickness(), strokeStyle());
+        HGDIOBJ oldPen = SelectObject(m_data->m_dc, pen);
+        for (Vector<Path>::const_iterator i = m_data->m_paths.begin(); i != m_data->m_paths.end(); ++i)
+            i->platformPath()->strokePath(m_data->m_dc, &m_data->m_transform);
+        SelectObject(m_data->m_dc, oldPen);
+        DeleteObject(pen);
+    }
+}
+
+void GraphicsContext::fillRect(const FloatRect& r, const Gradient* gradient)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    const Vector<Gradient::ColorStop>& stops = gradient->getStops();
+    if (stops.isEmpty())
+        return;
+
+    size_t numStops = stops.size();
+    if (numStops == 1) {
+        const Gradient::ColorStop& stop = stops.first();
+        Color color(stop.red, stop.green, stop.blue, stop.alpha);
+        fillRect(r, color);
+        return;
+    } 
+    
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect intRect = enclosingIntRect(r);
+    IntRect rect = m_data->mapRect(intRect);
+    TransparentLayerDC transparentDC(m_data, rect, &intRect, 255, true);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+
+    rect.move(transparentDC.toShift());
+    FloatPoint fp0 = m_data->mapPoint(gradient->p0());
+    FloatPoint fp1 = m_data->mapPoint(gradient->p1());
+    IntPoint p0(stableRound(fp0.x()), stableRound(fp0.y()));
+    IntPoint p1(stableRound(fp1.x()), stableRound(fp1.y()));
+    p0 += transparentDC.toShift();
+    p1 += transparentDC.toShift();
+
+    if (gradient->isRadial()) {
+        if (g_radialGradientFiller) {
+            // FIXME: don't support 2D scaling at this time
+            double scale = (m_data->m_transform.a() + m_data->m_transform.d()) * 0.5;
+            float r0 = gradient->r0() * scale;
+            float r1 = gradient->r1() * scale;
+            g_radialGradientFiller(dc, rect, p0, p1, r0, r1, gradient->getStops());
+            return;
+        }
+    } else if (g_linearGradientFiller) {
+        g_linearGradientFiller(dc, rect, p0, p1, gradient->getStops());
+        return;
+    }
+
+    // Simple 1D linear solution that assumes p0 is on the top or left side, and p1 is on the right or bottom side
+    size_t numRects = (numStops - 1);
+    Vector<TRIVERTEX, 20> tv;
+    tv.resize(numRects * 2);
+    Vector<GRADIENT_RECT, 10> mesh;
+    mesh.resize(numRects);
+    int x = rect.x();
+    int y = rect.y();
+    int width = rect.width();
+    int height = rect.height();
+    FloatSize d = gradient->p1() - gradient->p0();
+    bool vertical = abs(d.height()) > abs(d.width());
+    for (size_t i = 0; i < numStops; ++i) {
+        const Gradient::ColorStop& stop = stops[i];
+        int iTv = i ? 2 * i - 1 : 0;
+        tv[iTv].Red = stop.red * 0xFFFF;
+        tv[iTv].Green = stop.green * 0xFFFF;
+        tv[iTv].Blue = stop.blue * 0xFFFF;
+        tv[iTv].Alpha = stop.alpha * 0xFFFF;
+        if (i) {
+            tv[iTv].x = vertical ? x + width: x + width * stop.stop;
+            tv[iTv].y = vertical ? y + height * stop.stop : y + height;
+            mesh[i - 1].UpperLeft = iTv - 1;
+            mesh[i - 1].LowerRight = iTv;
+        } else {
+            tv[iTv].x = x;
+            tv[iTv].y = y;
+        }
+
+        if (i && i < numRects) {
+            tv[iTv + 1] = tv[iTv];
+            if (vertical)
+                tv[iTv + 1].x = x;
+            else
+                tv[iTv + 1].y = y;
+        }
+    }
+
+    GradientFill(dc, tv.data(), tv.size(), mesh.data(), mesh.size(), vertical ? GRADIENT_FILL_RECT_V : GRADIENT_FILL_RECT_H);
+}
+
+TransformationMatrix GraphicsContext::getCTM() const
+{
+    return m_data->m_transform;
+}
+
+void GraphicsContext::clipToImageBuffer(const FloatRect&, const ImageBuffer*)
+{
+    notImplemented();
+}
+
+void GraphicsContext::fillRect(const FloatRect& rect)
+{
+    if (m_common->state.fillColorSpace == GradientColorSpace && m_common->state.fillGradient)
+        fillRect(rect, m_common->state.fillGradient.get());
+    else
+        fillRect(rect, fillColor());
+}
+
+void GraphicsContext::setPlatformShadow(const IntSize&, int, const Color&)
+{
+    notImplemented();
+}
+
+void GraphicsContext::clearPlatformShadow()
+{
+    notImplemented();
+}
+
+void GraphicsContext::setImageInterpolationQuality(InterpolationQuality)
+{
+    notImplemented();
+}
+
+static inline bool isCharVisible(UChar c)
+{
+    return c && c != zeroWidthSpace;
+}
+
+void GraphicsContext::drawText(const Font& font, const TextRun& run, const IntPoint& point, int from, int to)
+{
+    if (paintingDisabled() || !fillColor().alpha() || !m_data->m_opacity)
+        return;
+
+    bool mustSupportAlpha = m_data->hasAlpha();
+
+    if (!mustSupportAlpha && fillColor().alpha() == 0xFF && m_data->m_opacity >= 1.0) {
+        font.drawText(this, run, point, from, to);
+        return;
+    }
+
+    float oldOpacity = m_data->m_opacity;
+    m_data->m_opacity *= fillColor().alpha() / 255.0;
+
+    FloatRect textRect = font.selectionRectForText(run, point, font.height(), from, to);
+    textRect.setY(textRect.y() - font.ascent());
+    IntRect trRect = enclosingIntRect(m_data->mapRect(textRect));
+    RECT bmpRect;
+    AlphaPaintType alphaPaintType = mustSupportAlpha ? AlphaPaintOther : AlphaPaintNone;
+    if (RefPtr<SharedBitmap> bmp = m_data->getTransparentLayerBitmap(trRect, alphaPaintType, bmpRect, true, mustSupportAlpha)) {
+        {
+            GraphicsContext gc(0);
+            gc.setBitmap(bmp);
+            gc.scale(FloatSize(m_data->m_transform.a(), m_data->m_transform.d()));
+            font.drawText(&gc, run, IntPoint(0, font.ascent()), from, to);
+        }
+        unsigned key1, key2;
+        HDC memDC = bmp->getDC(&key1, &key2);
+        if (memDC) {
+            m_data->paintBackTransparentLayerBitmap(memDC, bmp.get(), trRect, alphaPaintType, bmpRect);
+            bmp->releaseDC(memDC, key1, key2);
+        }
+    }
+
+    m_data->m_opacity = oldOpacity;
+}
+
+void GraphicsContext::drawText(const SimpleFontData* fontData, const GlyphBuffer& glyphBuffer,
+                      int from, int numGlyphs, const FloatPoint& point)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    for (;;) {
+        if (!numGlyphs)
+            return;
+        if (isCharVisible(*glyphBuffer.glyphs(from)))
+            break;
+        ++from;
+        --numGlyphs;
+    }
+
+    double scaleX = m_data->m_transform.a();
+    double scaleY = m_data->m_transform.d();
+
+    int height = fontData->platformData().size() * scaleY;
+    int width = fontData->platformData().averageCharWidth() * scaleX;
+
+    if (!height || !width)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    HFONT hFont = height > 1
+        ? fontData->platformData().getScaledFontHandle(height, scaleX == scaleY ? 0 : width)
+        : 0;
+
+    FloatPoint startPoint(point.x(), point.y() - fontData->ascent());
+    FloatPoint trPoint = m_data->mapPoint(startPoint);
+    int y = stableRound(trPoint.y());
+
+    Color color = fillColor();
+    if (!color.alpha())
+        return;
+
+    COLORREF fontColor = RGB(color.red(), color.green(), color.blue());
+
+    if (!hFont) {
+        double offset = trPoint.x();
+        const GlyphBufferAdvance* advance = glyphBuffer.advances(from);
+        if (scaleX == 1.)
+            for (int i = 1; i < numGlyphs; ++i)
+                offset += *advance++;
+        else
+            for (int i = 1; i < numGlyphs; ++i)
+                offset += *advance++ * scaleX;
+
+        offset += width;
+
+        OwnPtr<HPEN> hPen(CreatePen(PS_DASH, 1, fontColor));
+        HGDIOBJ oldPen = SelectObject(m_data->m_dc, hPen.get());
+
+        MoveToEx(m_data->m_dc, stableRound(trPoint.x()), y, 0);
+        LineTo(m_data->m_dc, stableRound(offset), y);
+
+        SelectObject(m_data->m_dc, oldPen);
+        return;
+    }
+
+    IntSize shadowSize;
+    int shadowBlur = 0;
+    Color shadowColor;
+    bool hasShadow = textDrawingMode() == cTextFill
+        && getShadow(shadowSize, shadowBlur, shadowColor)
+        && shadowColor.alpha();
+    COLORREF shadowRGBColor;
+    FloatPoint trShadowPoint;
+    if (hasShadow) {
+        shadowRGBColor = RGB(shadowColor.red(), shadowColor.green(), shadowColor.blue());
+        trShadowPoint = m_data->mapPoint(startPoint + shadowSize);
+    }
+
+    HGDIOBJ hOldFont = SelectObject(m_data->m_dc, hFont);
+    COLORREF oldTextColor = GetTextColor(m_data->m_dc);
+    int oldTextAlign = GetTextAlign(m_data->m_dc);
+    SetTextAlign(m_data->m_dc, 0);
+
+    int oldBkMode = GetBkMode(m_data->m_dc);
+    SetBkMode(m_data->m_dc, TRANSPARENT);
+
+    if (numGlyphs > 1) {
+        double offset = trPoint.x();
+        Vector<int, 256> glyphSpace(numGlyphs);
+        Vector<UChar, 256> text(numGlyphs);
+        int* curSpace = glyphSpace.data();
+        UChar* curChar = text.data();
+        const UChar* srcChar = glyphBuffer.glyphs(from);
+        const UChar* const srcCharEnd = srcChar + numGlyphs;
+        *curChar++ = *srcChar++;
+        int firstOffset = stableRound(offset);
+        int lastOffset = firstOffset;
+        const GlyphBufferAdvance* advance = glyphBuffer.advances(from);
+        // FIXME: ExtTextOut() can flip over each word for RTL languages, even when TA_RTLREADING is off.
+        // (this can be GDI bug or font driver bug?)
+        // We are not clear how it processes characters and handles specified spaces. On the other side,
+        // our glyph buffer is already in the correct order for rendering. So, the solution is that we
+        // call ExtTextOut() for each single character when the text contains any RTL character.
+        // This solution is not perfect as it is slower than calling ExtTextOut() one time for all characters.
+        // Drawing characters one by one may be too slow.
+        bool drawOneByOne = false;
+        if (scaleX == 1.) {
+            for (; srcChar < srcCharEnd; ++srcChar) {
+                offset += *advance++;
+                int offsetInt = stableRound(offset);
+                if (isCharVisible(*srcChar)) {
+                    if (!drawOneByOne && WTF::Unicode::direction(*srcChar) == WTF::Unicode::RightToLeft)
+                        drawOneByOne = true;
+                    *curChar++ = *srcChar;
+                    *curSpace++ = offsetInt - lastOffset;
+                    lastOffset = offsetInt;
+                }
+            }
+        } else {
+            for (; srcChar < srcCharEnd; ++srcChar) {
+                offset += *advance++ * scaleX;
+                int offsetInt = stableRound(offset);
+                if (isCharVisible(*srcChar)) {
+                    if (!drawOneByOne && WTF::Unicode::direction(*srcChar) == WTF::Unicode::RightToLeft)
+                        drawOneByOne = true;
+                    *curChar++ = *srcChar;
+                    *curSpace++ = offsetInt - lastOffset;
+                    lastOffset = offsetInt;
+                }
+            }
+        }
+        numGlyphs = curChar - text.data();
+        if (hasShadow) {
+            SetTextColor(m_data->m_dc, shadowRGBColor);
+            if (drawOneByOne) {
+                int xShadow = firstOffset + stableRound(trShadowPoint.x() - trPoint.x());
+                int yShadow = stableRound(trShadowPoint.y());
+                for (int i = 0; i < numGlyphs; ++i) {
+                    ExtTextOut(m_data->m_dc, xShadow, yShadow, 0, NULL, text.data() + i, 1, 0);
+                    xShadow += glyphSpace[i];
+                }
+            } else
+                ExtTextOut(m_data->m_dc, firstOffset + stableRound(trShadowPoint.x() - trPoint.x()), stableRound(trShadowPoint.y()), 0, NULL, text.data(), numGlyphs, glyphSpace.data());
+        }
+        SetTextColor(m_data->m_dc, fontColor);
+        if (drawOneByOne) {
+            int x = firstOffset;
+            for (int i = 0; i < numGlyphs; ++i) {
+                ExtTextOut(m_data->m_dc, x, y, 0, NULL, text.data() + i, 1, 0);
+                x += glyphSpace[i];
+            }
+        } else
+            ExtTextOut(m_data->m_dc, firstOffset, y, 0, NULL, text.data(), numGlyphs, glyphSpace.data());
+    } else {
+        UChar c = *glyphBuffer.glyphs(from);
+        if (hasShadow) {
+            SetTextColor(m_data->m_dc, shadowRGBColor);
+            ExtTextOut(m_data->m_dc, stableRound(trShadowPoint.x()), stableRound(trShadowPoint.y()), 0, NULL, &c, 1, 0);
+        }
+        SetTextColor(m_data->m_dc, fontColor);
+        ExtTextOut(m_data->m_dc, stableRound(trPoint.x()), y, 0, NULL, &c, 1, 0);
+    }
+
+    SetTextAlign(m_data->m_dc, oldTextAlign);
+    SetTextColor(m_data->m_dc, oldTextColor);
+    SetBkMode(m_data->m_dc, oldBkMode);
+    SelectObject(m_data->m_dc, hOldFont);
+}
+
+void GraphicsContext::drawFrameControl(const IntRect& rect, unsigned type, unsigned state)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    const int boxWidthBest = 8;
+    const int boxHeightBest = 8;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+    TransparentLayerDC transparentDC(m_data, trRect, &rect, 255, true);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    RECT rectWin = trRect;
+
+    if ((rectWin.right - rectWin.left) < boxWidthBest) {
+        RefPtr<SharedBitmap> bmp = SharedBitmap::createInstance(true, boxWidthBest, boxHeightBest, true);
+        SharedBitmap::DCHolder memDC(bmp.get());
+        if (memDC.get()) {
+            RECT tempRect = {0, 0, boxWidthBest, boxHeightBest};
+            DrawFrameControl(memDC.get(), &tempRect, type, state);
+
+            ::StretchBlt(dc, rectWin.left, rectWin.top, rectWin.right - rectWin.left, rectWin.bottom - rectWin.top, memDC.get(), 0, 0, boxWidthBest, boxHeightBest, SRCCOPY);
+            return;
+        }
+    }
+
+    DrawFrameControl(dc, &rectWin, type, state);
+}
+
+void GraphicsContext::drawFocusRect(const IntRect& rect)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+    TransparentLayerDC transparentDC(m_data, trRect, &rect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    RECT rectWin = trRect;
+    DrawFocusRect(dc, &rectWin);
+}
+
+void GraphicsContext::paintTextField(const IntRect& rect, unsigned state)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect trRect = m_data->mapRect(rect);
+    TransparentLayerDC transparentDC(m_data, trRect, &rect);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+
+    RECT rectWin = trRect;
+    DrawEdge(dc, &rectWin, EDGE_ETCHED, BF_RECT | BF_ADJUST);
+    FillRect(dc, &rectWin, reinterpret_cast<HBRUSH>(((state & DFCS_INACTIVE) ? COLOR_BTNFACE : COLOR_WINDOW) + 1));
+}
+
+void GraphicsContext::drawBitmap(SharedBitmap* bmp, const IntRect& dstRectIn, const IntRect& srcRect, CompositeOperator compositeOp)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect dstRect = m_data->mapRect(dstRectIn);
+    TransparentLayerDC transparentDC(m_data, dstRect, &dstRectIn, 255, true);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    dstRect.move(transparentDC.toShift());
+
+    bmp->draw(dc, dstRect, srcRect, compositeOp);
+
+    if (bmp->is16bit())
+        transparentDC.fillAlphaChannel();
+}
+
+void GraphicsContext::drawBitmapPattern(SharedBitmap* bmp, const FloatRect& tileRectIn, const TransformationMatrix& patternTransform,
+                const FloatPoint& phase, CompositeOperator op, const FloatRect& destRectIn, const IntSize& origSourceSize)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect intDstRect = enclosingIntRect(destRectIn);
+    IntRect trRect = m_data->mapRect(intDstRect);
+    TransparentLayerDC transparentDC(m_data, trRect, &intDstRect, 255, true);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    trRect.move(transparentDC.toShift());
+    FloatRect movedDstRect = m_data->m_transform.inverse().mapRect(FloatRect(trRect));
+    FloatSize moved(movedDstRect.location() - destRectIn.location());
+    TransformationMatrix transform = m_data->m_transform;
+    transform.translate(moved.width(), moved.height());
+
+    bmp->drawPattern(dc, transform, tileRectIn, patternTransform, phase, op, destRectIn, origSourceSize);
+
+    if (!bmp->hasAlpha())
+        transparentDC.fillAlphaChannel();
+}
+
+void GraphicsContext::drawIcon(HICON icon, const IntRect& dstRectIn, UINT flags)
+{
+    if (!m_data->m_opacity)
+        return;
+
+    ScopeDCProvider dcProvider(m_data);
+    if (!m_data->m_dc)
+        return;
+
+    IntRect dstRect = m_data->mapRect(dstRectIn);
+    TransparentLayerDC transparentDC(m_data, dstRect, &dstRectIn, 255, true);
+    HDC dc = transparentDC.hdc();
+    if (!dc)
+        return;
+    dstRect.move(transparentDC.toShift());
+
+    DrawIconEx(dc, dstRect.x(), dstRect.y(), icon, dstRect.width(), dstRect.height(), 0, NULL, flags);
+}
+
+void GraphicsContext::setPlatformShouldAntialias(bool)
+{
+    notImplemented();
+}
+
+void GraphicsContext::setLineDash(const DashArray&, float)
+{
+    notImplemented();
+}
+
+void GraphicsContext::clipPath(WindRule)
+{
+    notImplemented();
+}
+
+} // namespace WebCore