/*
 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 *
 * 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.
 */

#import "config.h"
#import "RenderThemeMac.h"

#import "BitmapImage.h"
#import "CSSStyleSelector.h"
#import "CSSValueKeywords.h"
#import "Document.h"
#import "Element.h"
#import "FoundationExtras.h"
#import "FrameView.h"
#import "GraphicsContext.h"
#import "HTMLInputElement.h"
#import "HTMLMediaElement.h"
#import "HTMLNames.h"
#import "Image.h"
#import "LocalCurrentGraphicsContext.h"
#import "RenderSlider.h"
#import "RenderView.h"
#import "SharedBuffer.h"
#import "WebCoreSystemInterface.h"
#import <Carbon/Carbon.h>
#import <Cocoa/Cocoa.h>
#import <wtf/RetainPtr.h>
#import <math.h>

#ifdef BUILDING_ON_TIGER
typedef unsigned NSUInteger;
#endif

using std::min;

// The methods in this file are specific to the Mac OS X platform.

// FIXME: The platform-independent code in this class should be factored out and merged with RenderThemeSafari. 

@interface WebCoreRenderThemeNotificationObserver : NSObject
{
    WebCore::RenderTheme *_theme;
}

- (id)initWithTheme:(WebCore::RenderTheme *)theme;
- (void)systemColorsDidChange:(NSNotification *)notification;

@end

@implementation WebCoreRenderThemeNotificationObserver

- (id)initWithTheme:(WebCore::RenderTheme *)theme
{
    [super init];
    _theme = theme;
    
    return self;
}

- (void)systemColorsDidChange:(NSNotification *)notification
{
    ASSERT([[notification name] isEqualToString:NSSystemColorsDidChangeNotification]);
    _theme->platformColorsDidChange();
}

@end

namespace WebCore {

using namespace HTMLNames;

enum {
    topMargin,
    rightMargin,
    bottomMargin,
    leftMargin
};

enum {
    topPadding,
    rightPadding,
    bottomPadding,
    leftPadding
};

RenderTheme* theme()
{
    static RenderThemeMac* macTheme = new RenderThemeMac;
    return macTheme;
}

RenderThemeMac::RenderThemeMac()
    : m_isSliderThumbHorizontalPressed(false)
    , m_isSliderThumbVerticalPressed(false)
    , m_notificationObserver(AdoptNS, [[WebCoreRenderThemeNotificationObserver alloc] initWithTheme:this])
{
    [[NSNotificationCenter defaultCenter] addObserver:m_notificationObserver.get()
                                                        selector:@selector(systemColorsDidChange:)
                                                            name:NSSystemColorsDidChangeNotification
                                                          object:nil];
}

RenderThemeMac::~RenderThemeMac()
{
    [[NSNotificationCenter defaultCenter] removeObserver:m_notificationObserver.get()];
}

Color RenderThemeMac::platformActiveSelectionBackgroundColor() const
{
    NSColor* color = [[NSColor selectedTextBackgroundColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    return Color(static_cast<int>(255.0 * [color redComponent]), static_cast<int>(255.0 * [color greenComponent]), static_cast<int>(255.0 * [color blueComponent]));
}

Color RenderThemeMac::platformInactiveSelectionBackgroundColor() const
{
    NSColor* color = [[NSColor secondarySelectedControlColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    return Color(static_cast<int>(255.0 * [color redComponent]), static_cast<int>(255.0 * [color greenComponent]), static_cast<int>(255.0 * [color blueComponent]));
}

Color RenderThemeMac::activeListBoxSelectionBackgroundColor() const
{
    NSColor* color = [[NSColor alternateSelectedControlColor] colorUsingColorSpaceName:NSDeviceRGBColorSpace];
    return Color(static_cast<int>(255.0 * [color redComponent]), static_cast<int>(255.0 * [color greenComponent]), static_cast<int>(255.0 * [color blueComponent]));
}

void RenderThemeMac::systemFont(int cssValueId, FontDescription& fontDescription) const
{
    static FontDescription systemFont;
    static FontDescription smallSystemFont;
    static FontDescription menuFont;
    static FontDescription labelFont;
    static FontDescription miniControlFont;
    static FontDescription smallControlFont;
    static FontDescription controlFont;

    FontDescription* cachedDesc;
    NSFont* font = nil;
    switch (cssValueId) {
        case CSS_VAL_SMALL_CAPTION:
            cachedDesc = &smallSystemFont;
            if (!smallSystemFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
            break;
        case CSS_VAL_MENU:
            cachedDesc = &menuFont;
            if (!menuFont.isAbsoluteSize())
                font = [NSFont menuFontOfSize:[NSFont systemFontSize]];
            break;
        case CSS_VAL_STATUS_BAR:
            cachedDesc = &labelFont;
            if (!labelFont.isAbsoluteSize())
                font = [NSFont labelFontOfSize:[NSFont labelFontSize]];
            break;
        case CSS_VAL__WEBKIT_MINI_CONTROL:
            cachedDesc = &miniControlFont;
            if (!miniControlFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSMiniControlSize]];
            break;
        case CSS_VAL__WEBKIT_SMALL_CONTROL:
            cachedDesc = &smallControlFont;
            if (!smallControlFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSSmallControlSize]];
            break;
        case CSS_VAL__WEBKIT_CONTROL:
            cachedDesc = &controlFont;
            if (!controlFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSRegularControlSize]];
            break;
        default:
            cachedDesc = &systemFont;
            if (!systemFont.isAbsoluteSize())
                font = [NSFont systemFontOfSize:[NSFont systemFontSize]];
    }

    if (font) {
        cachedDesc->setIsAbsoluteSize(true);
        cachedDesc->setGenericFamily(FontDescription::NoFamily);
        cachedDesc->firstFamily().setFamily([font familyName]);
        cachedDesc->setSpecifiedSize([font pointSize]);
        NSFontTraitMask traits = [[NSFontManager sharedFontManager] traitsOfFont:font];
        cachedDesc->setBold(traits & NSBoldFontMask);
        cachedDesc->setItalic(traits & NSItalicFontMask);
    }
    fontDescription = *cachedDesc;
}

static RGBA32 convertNSColorToColor(NSColor *color)
{
    NSColor *colorInColorSpace = [color colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
    if (colorInColorSpace) {
        static const double scaleFactor = nextafter(256.0, 0.0);
        return makeRGB(static_cast<int>(scaleFactor * [colorInColorSpace redComponent]),
            static_cast<int>(scaleFactor * [colorInColorSpace greenComponent]),
            static_cast<int>(scaleFactor * [colorInColorSpace blueComponent]));
    }

    // This conversion above can fail if the NSColor in question is an NSPatternColor 
    // (as many system colors are). These colors are actually a repeating pattern
    // not just a solid color. To work around this we simply draw a 1x1 image of
    // the color and use that pixel's color. It might be better to use an average of
    // the colors in the pattern instead.
    NSBitmapImageRep *offscreenRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:nil
                                                                             pixelsWide:1
                                                                             pixelsHigh:1
                                                                          bitsPerSample:8
                                                                        samplesPerPixel:4
                                                                               hasAlpha:YES
                                                                               isPlanar:NO
                                                                         colorSpaceName:NSCalibratedRGBColorSpace
                                                                            bytesPerRow:4
                                                                           bitsPerPixel:32];

    [NSGraphicsContext saveGraphicsState];
    [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithBitmapImageRep:offscreenRep]];
    NSEraseRect(NSMakeRect(0, 0, 1, 1));
    [color drawSwatchInRect:NSMakeRect(0, 0, 1, 1)];
    [NSGraphicsContext restoreGraphicsState];

    NSUInteger pixel[4];
    [offscreenRep getPixel:pixel atX:0 y:0];

    [offscreenRep release];

    return makeRGB(pixel[0], pixel[1], pixel[2]);
}

static RGBA32 menuBackgroundColor()
{
    NSBitmapImageRep *offscreenRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:nil
                                                                             pixelsWide:1
                                                                             pixelsHigh:1
                                                                          bitsPerSample:8
                                                                        samplesPerPixel:4
                                                                               hasAlpha:YES
                                                                               isPlanar:NO
                                                                         colorSpaceName:NSCalibratedRGBColorSpace
                                                                            bytesPerRow:4
                                                                           bitsPerPixel:32];

    CGContextRef context = static_cast<CGContextRef>([[NSGraphicsContext graphicsContextWithBitmapImageRep:offscreenRep] graphicsPort]);
    CGRect rect = CGRectMake(0, 0, 1, 1);
    HIThemeMenuDrawInfo drawInfo;
    drawInfo.version =  0;
    drawInfo.menuType = kThemeMenuTypePopUp;
    HIThemeDrawMenuBackground(&rect, &drawInfo, context, kHIThemeOrientationInverted);

    NSUInteger pixel[4];
    [offscreenRep getPixel:pixel atX:0 y:0];

    [offscreenRep release];

    return makeRGB(pixel[0], pixel[1], pixel[2]);
}

void RenderThemeMac::platformColorsDidChange()
{
    m_systemColorCache.clear();
    RenderTheme::platformColorsDidChange();
}

Color RenderThemeMac::systemColor(int cssValueId) const
{
    if (m_systemColorCache.contains(cssValueId))
        return m_systemColorCache.get(cssValueId);
    
    Color color;
    switch (cssValueId) {
        case CSS_VAL_ACTIVEBORDER:
            color = convertNSColorToColor([NSColor keyboardFocusIndicatorColor]);
            break;
        case CSS_VAL_ACTIVECAPTION:
            color = convertNSColorToColor([NSColor windowFrameTextColor]);
            break;
        case CSS_VAL_APPWORKSPACE:
            color = convertNSColorToColor([NSColor headerColor]);
            break;
        case CSS_VAL_BACKGROUND:
            // Use theme independent default
            break;
        case CSS_VAL_BUTTONFACE:
            // We use this value instead of NSColor's controlColor to avoid website incompatibilities.
            // We may want to change this to use the NSColor in future.
            color = 0xFFC0C0C0;
            break;
        case CSS_VAL_BUTTONHIGHLIGHT:
            color = convertNSColorToColor([NSColor controlHighlightColor]);
            break;
        case CSS_VAL_BUTTONSHADOW:
            color = convertNSColorToColor([NSColor controlShadowColor]);
            break;
        case CSS_VAL_BUTTONTEXT:
            color = convertNSColorToColor([NSColor controlTextColor]);
            break;
        case CSS_VAL_CAPTIONTEXT:
            color = convertNSColorToColor([NSColor textColor]);
            break;
        case CSS_VAL_GRAYTEXT:
            color = convertNSColorToColor([NSColor disabledControlTextColor]);
            break;
        case CSS_VAL_HIGHLIGHT:
            color = convertNSColorToColor([NSColor selectedTextBackgroundColor]);
            break;
        case CSS_VAL_HIGHLIGHTTEXT:
            color = convertNSColorToColor([NSColor selectedTextColor]);
            break;
        case CSS_VAL_INACTIVEBORDER:
            color = convertNSColorToColor([NSColor controlBackgroundColor]);
            break;
        case CSS_VAL_INACTIVECAPTION:
            color = convertNSColorToColor([NSColor controlBackgroundColor]);
            break;
        case CSS_VAL_INACTIVECAPTIONTEXT:
            color = convertNSColorToColor([NSColor textColor]);
            break;
        case CSS_VAL_INFOBACKGROUND:
            // There is no corresponding NSColor for this so we use a hard coded value.
            color = 0xFFFBFCC5;
            break;
        case CSS_VAL_INFOTEXT:
            color = convertNSColorToColor([NSColor textColor]);
            break;
        case CSS_VAL_MENU:
            color = menuBackgroundColor();
            break;
        case CSS_VAL_MENUTEXT:
            color = convertNSColorToColor([NSColor selectedMenuItemTextColor]);
            break;
        case CSS_VAL_SCROLLBAR:
            color = convertNSColorToColor([NSColor scrollBarColor]);
            break;
        case CSS_VAL_TEXT:
            color = convertNSColorToColor([NSColor textColor]);
            break;
        case CSS_VAL_THREEDDARKSHADOW:
            color = convertNSColorToColor([NSColor controlDarkShadowColor]);
            break;
        case CSS_VAL_THREEDSHADOW:
            color = convertNSColorToColor([NSColor shadowColor]);
            break;
        case CSS_VAL_THREEDFACE:
            // We use this value instead of NSColor's controlColor to avoid website incompatibilities.
            // We may want to change this to use the NSColor in future.
            color = 0xFFC0C0C0;
            break;
        case CSS_VAL_THREEDHIGHLIGHT:
            color = convertNSColorToColor([NSColor highlightColor]);
            break;
        case CSS_VAL_THREEDLIGHTSHADOW:
            color = convertNSColorToColor([NSColor controlLightHighlightColor]);
            break;
        case CSS_VAL_WINDOW:
            color = convertNSColorToColor([NSColor windowBackgroundColor]);
            break;
        case CSS_VAL_WINDOWFRAME:
            color = convertNSColorToColor([NSColor windowFrameColor]);
            break;
        case CSS_VAL_WINDOWTEXT:
            color = convertNSColorToColor([NSColor windowFrameTextColor]);
            break;
    }

    if (!color.isValid())
        color = RenderTheme::systemColor(cssValueId);

    if (color.isValid())
        m_systemColorCache.set(cssValueId, color.rgb());

    return color;
}

bool RenderThemeMac::isControlStyled(const RenderStyle* style, const BorderData& border,
                                     const BackgroundLayer& background, const Color& backgroundColor) const
{
    if (style->appearance() == TextFieldAppearance || style->appearance() == TextAreaAppearance || style->appearance() == ListboxAppearance)
        return style->border() != border;
    return RenderTheme::isControlStyled(style, border, background, backgroundColor);
}

void RenderThemeMac::adjustRepaintRect(const RenderObject* o, IntRect& r)
{
    switch (o->style()->appearance()) {
        case CheckboxAppearance: {
            // Since we query the prototype cell, we need to update its state to match.
            setCheckboxCellState(o, r);

            // We inflate the rect as needed to account for padding included in the cell to accommodate the checkbox
            // shadow" and the check.  We don't consider this part of the bounds of the control in WebKit.
            r = inflateRect(r, checkboxSizes()[[checkbox() controlSize]], checkboxMargins());
            break;
        }
        case RadioAppearance: {
            // Since we query the prototype cell, we need to update its state to match.
            setRadioCellState(o, r);

            // We inflate the rect as needed to account for padding included in the cell to accommodate the checkbox
            // shadow" and the check.  We don't consider this part of the bounds of the control in WebKit.
            r = inflateRect(r, radioSizes()[[radio() controlSize]], radioMargins());
            break;
        }
        case PushButtonAppearance:
        case ButtonAppearance: {
            // Since we query the prototype cell, we need to update its state to match.
            setButtonCellState(o, r);

            // We inflate the rect as needed to account for padding included in the cell to accommodate the checkbox
            // shadow" and the check.  We don't consider this part of the bounds of the control in WebKit.
            if ([button() bezelStyle] == NSRoundedBezelStyle)
                r = inflateRect(r, buttonSizes()[[button() controlSize]], buttonMargins());
            break;
        }
        case MenulistAppearance: {
            setPopupButtonCellState(o, r);
            r = inflateRect(r, popupButtonSizes()[[popupButton() controlSize]], popupButtonMargins());
            break;
        }
        default:
            break;
    }
}

IntRect RenderThemeMac::inflateRect(const IntRect& r, const IntSize& size, const int* margins) const
{
    // Only do the inflation if the available width/height are too small.  Otherwise try to
    // fit the glow/check space into the available box's width/height.
    int widthDelta = r.width() - (size.width() + margins[leftMargin] + margins[rightMargin]);
    int heightDelta = r.height() - (size.height() + margins[topMargin] + margins[bottomMargin]);
    IntRect result(r);
    if (widthDelta < 0) {
        result.setX(result.x() - margins[leftMargin]);
        result.setWidth(result.width() - widthDelta);
    }
    if (heightDelta < 0) {
        result.setY(result.y() - margins[topMargin]);
        result.setHeight(result.height() - heightDelta);
    }
    return result;
}

void RenderThemeMac::updateCheckedState(NSCell* cell, const RenderObject* o)
{
    bool oldIndeterminate = [cell state] == NSMixedState;
    bool indeterminate = isIndeterminate(o);
    bool checked = isChecked(o);

    if (oldIndeterminate != indeterminate) {
        [cell setState:indeterminate ? NSMixedState : (checked ? NSOnState : NSOffState)];
        return;
    }

    bool oldChecked = [cell state] == NSOnState;
    if (checked != oldChecked)
        [cell setState:checked ? NSOnState : NSOffState];
}

void RenderThemeMac::updateEnabledState(NSCell* cell, const RenderObject* o)
{
    bool oldEnabled = [cell isEnabled];
    bool enabled = isEnabled(o);
    if (enabled != oldEnabled)
        [cell setEnabled:enabled];
}

void RenderThemeMac::updateFocusedState(NSCell* cell, const RenderObject* o)
{
    bool oldFocused = [cell showsFirstResponder];
    bool focused = isFocused(o) && o->style()->outlineStyleIsAuto();
    if (focused != oldFocused)
        [cell setShowsFirstResponder:focused];
}

void RenderThemeMac::updatePressedState(NSCell* cell, const RenderObject* o)
{
    bool oldPressed = [cell isHighlighted];
    bool pressed = (o->element() && o->element()->active());
    if (pressed != oldPressed)
        [cell setHighlighted:pressed];
}

short RenderThemeMac::baselinePosition(const RenderObject* o) const
{
    if (o->style()->appearance() == CheckboxAppearance || o->style()->appearance() == RadioAppearance)
        return o->marginTop() + o->height() - 2; // The baseline is 2px up from the bottom of the checkbox/radio in AppKit.
    return RenderTheme::baselinePosition(o);
}

bool RenderThemeMac::controlSupportsTints(const RenderObject* o) const
{
    // An alternate way to implement this would be to get the appropriate cell object
    // and call the private _needRedrawOnWindowChangedKeyState method. An advantage of
    // that would be that we would match AppKit behavior more closely, but a disadvantage
    // would be that we would rely on an AppKit SPI method.

    if (!isEnabled(o))
        return false;

    // Checkboxes only have tint when checked.
    if (o->style()->appearance() == CheckboxAppearance)
        return isChecked(o);

    // For now assume other controls have tint if enabled.
    return true;
}

NSControlSize RenderThemeMac::controlSizeForFont(RenderStyle* style) const
{
    int fontSize = style->fontSize();
    if (fontSize >= 16)
        return NSRegularControlSize;
    if (fontSize >= 11)
        return NSSmallControlSize;
    return NSMiniControlSize;
}

void RenderThemeMac::setControlSize(NSCell* cell, const IntSize* sizes, const IntSize& minSize)
{
    NSControlSize size;
    if (minSize.width() >= sizes[NSRegularControlSize].width() &&
        minSize.height() >= sizes[NSRegularControlSize].height())
        size = NSRegularControlSize;
    else if (minSize.width() >= sizes[NSSmallControlSize].width() &&
             minSize.height() >= sizes[NSSmallControlSize].height())
        size = NSSmallControlSize;
    else
        size = NSMiniControlSize;
    if (size != [cell controlSize]) // Only update if we have to, since AppKit does work even if the size is the same.
        [cell setControlSize:size];
}

IntSize RenderThemeMac::sizeForFont(RenderStyle* style, const IntSize* sizes) const
{
    return sizes[controlSizeForFont(style)];
}

IntSize RenderThemeMac::sizeForSystemFont(RenderStyle* style, const IntSize* sizes) const
{
    return sizes[controlSizeForSystemFont(style)];
}

void RenderThemeMac::setSizeFromFont(RenderStyle* style, const IntSize* sizes) const
{
    // FIXME: Check is flawed, since it doesn't take min-width/max-width into account.
    IntSize size = sizeForFont(style, sizes);
    if (style->width().isIntrinsicOrAuto() && size.width() > 0)
        style->setWidth(Length(size.width(), Fixed));
    if (style->height().isAuto() && size.height() > 0)
        style->setHeight(Length(size.height(), Fixed));
}

void RenderThemeMac::setFontFromControlSize(CSSStyleSelector* selector, RenderStyle* style, NSControlSize controlSize) const
{
    FontDescription fontDescription;
    fontDescription.setIsAbsoluteSize(true);
    fontDescription.setGenericFamily(FontDescription::SerifFamily);

    NSFont* font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:controlSize]];
    fontDescription.firstFamily().setFamily([font familyName]);
    fontDescription.setComputedSize([font pointSize]);
    fontDescription.setSpecifiedSize([font pointSize]);

    // Reset line height
    style->setLineHeight(RenderStyle::initialLineHeight());

    if (style->setFontDescription(fontDescription))
        style->font().update(0);
}

NSControlSize RenderThemeMac::controlSizeForSystemFont(RenderStyle* style) const
{
    int fontSize = style->fontSize();
    if (fontSize >= [NSFont systemFontSizeForControlSize:NSRegularControlSize])
        return NSRegularControlSize;
    if (fontSize >= [NSFont systemFontSizeForControlSize:NSSmallControlSize])
        return NSSmallControlSize;
    return NSMiniControlSize;
}

bool RenderThemeMac::paintCheckbox(RenderObject* o, const RenderObject::PaintInfo&, const IntRect& r)
{
    // Determine the width and height needed for the control and prepare the cell for painting.
    setCheckboxCellState(o, r);

    // We inflate the rect as needed to account for padding included in the cell to accommodate the checkbox
    // shadow" and the check.  We don't consider this part of the bounds of the control in WebKit.
    NSButtonCell* checkbox = this->checkbox();
    IntRect inflatedRect = inflateRect(r, checkboxSizes()[[checkbox controlSize]], checkboxMargins());
    [checkbox drawWithFrame:NSRect(inflatedRect) inView:o->view()->frameView()->getDocumentView()];
    [checkbox setControlView:nil];

    return false;
}

const IntSize* RenderThemeMac::checkboxSizes() const
{
    static const IntSize sizes[3] = { IntSize(14, 14), IntSize(12, 12), IntSize(10, 10) };
    return sizes;
}

const int* RenderThemeMac::checkboxMargins() const
{
    static const int margins[3][4] =
    {
        { 3, 4, 4, 2 },
        { 4, 3, 3, 3 },
        { 4, 3, 3, 3 },
    };
    return margins[[checkbox() controlSize]];
}

void RenderThemeMac::setCheckboxCellState(const RenderObject* o, const IntRect& r)
{
    NSButtonCell* checkbox = this->checkbox();

    // Set the control size based off the rectangle we're painting into.
    setControlSize(checkbox, checkboxSizes(), r.size());

    // Update the various states we respond to.
    updateCheckedState(checkbox, o);
    updateEnabledState(checkbox, o);
    updatePressedState(checkbox, o);
    updateFocusedState(checkbox, o);
}

void RenderThemeMac::setCheckboxSize(RenderStyle* style) const
{
    // If the width and height are both specified, then we have nothing to do.
    if (!style->width().isIntrinsicOrAuto() && !style->height().isAuto())
        return;

    // Use the font size to determine the intrinsic width of the control.
    setSizeFromFont(style, checkboxSizes());
}

bool RenderThemeMac::paintRadio(RenderObject* o, const RenderObject::PaintInfo&, const IntRect& r)
{
    // Determine the width and height needed for the control and prepare the cell for painting.
    setRadioCellState(o, r);

    // We inflate the rect as needed to account for padding included in the cell to accommodate the checkbox
    // shadow" and the check.  We don't consider this part of the bounds of the control in WebKit.
    NSButtonCell* radio = this->radio();
    IntRect inflatedRect = inflateRect(r, radioSizes()[[radio controlSize]], radioMargins());
    [radio drawWithFrame:NSRect(inflatedRect) inView:o->view()->frameView()->getDocumentView()];
    [radio setControlView:nil];

    return false;
}

const IntSize* RenderThemeMac::radioSizes() const
{
    static const IntSize sizes[3] = { IntSize(14, 15), IntSize(12, 13), IntSize(10, 10) };
    return sizes;
}

const int* RenderThemeMac::radioMargins() const
{
    static const int margins[3][4] =
    {
        { 2, 2, 4, 2 },
        { 3, 2, 3, 2 },
        { 1, 0, 2, 0 },
    };
    return margins[[radio() controlSize]];
}

void RenderThemeMac::setRadioCellState(const RenderObject* o, const IntRect& r)
{
    NSButtonCell* radio = this->radio();

    // Set the control size based off the rectangle we're painting into.
    setControlSize(radio, radioSizes(), r.size());

    // Update the various states we respond to.
    updateCheckedState(radio, o);
    updateEnabledState(radio, o);
    updatePressedState(radio, o);
    updateFocusedState(radio, o);
}


void RenderThemeMac::setRadioSize(RenderStyle* style) const
{
    // If the width and height are both specified, then we have nothing to do.
    if (!style->width().isIntrinsicOrAuto() && !style->height().isAuto())
        return;

    // Use the font size to determine the intrinsic width of the control.
    setSizeFromFont(style, radioSizes());
}

void RenderThemeMac::setButtonPaddingFromControlSize(RenderStyle* style, NSControlSize size) const
{
    // Just use 8px.  AppKit wants to use 11px for mini buttons, but that padding is just too large
    // for real-world Web sites (creating a huge necessary minimum width for buttons whose space is
    // by definition constrained, since we select mini only for small cramped environments.
    // This also guarantees the HTML4 <button> will match our rendering by default, since we're using a consistent
    // padding.
    const int padding = 8;
    style->setPaddingLeft(Length(padding, Fixed));
    style->setPaddingRight(Length(padding, Fixed));
    style->setPaddingTop(Length(0, Fixed));
    style->setPaddingBottom(Length(0, Fixed));
}

void RenderThemeMac::adjustButtonStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    // There are three appearance constants for buttons.
    // (1) Push-button is the constant for the default Aqua system button.  Push buttons will not scale vertically and will not allow
    // custom fonts or colors.  <input>s use this constant.  This button will allow custom colors and font weights/variants but won't
    // scale vertically.
    // (2) square-button is the constant for the square button.  This button will allow custom fonts and colors and will scale vertically.
    // (3) Button is the constant that means "pick the best button as appropriate."  <button>s use this constant.  This button will
    // also scale vertically and allow custom fonts and colors.  It will attempt to use Aqua if possible and will make this determination
    // solely on the rectangle of the control.

    // Determine our control size based off our font.
    NSControlSize controlSize = controlSizeForFont(style);

    if (style->appearance() == PushButtonAppearance) {
        // Ditch the border.
        style->resetBorder();

        // Height is locked to auto.
        style->setHeight(Length(Auto));

        // White-space is locked to pre
        style->setWhiteSpace(PRE);

        // Set the button's vertical size.
        setButtonSize(style);

        // Add in the padding that we'd like to use.
        setButtonPaddingFromControlSize(style, controlSize);

        // Our font is locked to the appropriate system font size for the control.  To clarify, we first use the CSS-specified font to figure out
        // a reasonable control size, but once that control size is determined, we throw that font away and use the appropriate
        // system font for the control size instead.
        setFontFromControlSize(selector, style, controlSize);
    } else {
        // Set a min-height so that we can't get smaller than the mini button.
        style->setMinHeight(Length(15, Fixed));

        // Reset the top and bottom borders.
        style->resetBorderTop();
        style->resetBorderBottom();
    }

    style->setBoxShadow(0);
}

const IntSize* RenderThemeMac::buttonSizes() const
{
    static const IntSize sizes[3] = { IntSize(0, 21), IntSize(0, 18), IntSize(0, 15) };
    return sizes;
}

const int* RenderThemeMac::buttonMargins() const
{
    static const int margins[3][4] =
    {
        { 4, 6, 7, 6 },
        { 4, 5, 6, 5 },
        { 0, 1, 1, 1 },
    };
    return margins[[button() controlSize]];
}

void RenderThemeMac::setButtonSize(RenderStyle* style) const
{
    // If the width and height are both specified, then we have nothing to do.
    if (!style->width().isIntrinsicOrAuto() && !style->height().isAuto())
        return;

    // Use the font size to determine the intrinsic width of the control.
    setSizeFromFont(style, buttonSizes());
}

void RenderThemeMac::setButtonCellState(const RenderObject* o, const IntRect& r)
{
    NSButtonCell* button = this->button();

    // Set the control size based off the rectangle we're painting into.
    if (o->style()->appearance() == SquareButtonAppearance ||
        r.height() > buttonSizes()[NSRegularControlSize].height()) {
        // Use the square button
        if ([button bezelStyle] != NSShadowlessSquareBezelStyle)
            [button setBezelStyle:NSShadowlessSquareBezelStyle];
    } else if ([button bezelStyle] != NSRoundedBezelStyle)
        [button setBezelStyle:NSRoundedBezelStyle];

    setControlSize(button, buttonSizes(), r.size());

    // Update the various states we respond to.
    updateCheckedState(button, o);
    updateEnabledState(button, o);
    updatePressedState(button, o);
    updateFocusedState(button, o);
}

bool RenderThemeMac::paintButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    NSButtonCell* button = this->button();
    LocalCurrentGraphicsContext localContext(paintInfo.context);

    // Determine the width and height needed for the control and prepare the cell for painting.
    setButtonCellState(o, r);

    // We inflate the rect as needed to account for padding included in the cell to accommodate the button
    // shadow.  We don't consider this part of the bounds of the control in WebKit.
    IntSize size = buttonSizes()[[button controlSize]];
    size.setWidth(r.width());
    IntRect inflatedRect = r;
    if ([button bezelStyle] == NSRoundedBezelStyle) {
        // Center the button within the available space.
        if (inflatedRect.height() > size.height()) {
            inflatedRect.setY(inflatedRect.y() + (inflatedRect.height() - size.height()) / 2);
            inflatedRect.setHeight(size.height());
        }

        // Now inflate it to account for the shadow.
        inflatedRect = inflateRect(inflatedRect, size, buttonMargins());
    }

    [button drawWithFrame:NSRect(inflatedRect) inView:o->view()->frameView()->getDocumentView()];
    [button setControlView:nil];

    return false;
}

bool RenderThemeMac::paintTextField(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawBezeledTextFieldCell(r, isEnabled(o) && !isReadOnlyControl(o));
    return false;
}

void RenderThemeMac::adjustTextFieldStyle(CSSStyleSelector*, RenderStyle*, Element*) const
{
}

bool RenderThemeMac::paintCapsLockIndicator(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    if (paintInfo.context->paintingDisabled())
        return true;

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawCapsLockIndicator(paintInfo.context->platformContext(), r);
    
    return false;
}

bool RenderThemeMac::paintTextArea(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawBezeledTextArea(r, isEnabled(o) && !isReadOnlyControl(o));
    return false;
}

void RenderThemeMac::adjustTextAreaStyle(CSSStyleSelector*, RenderStyle*, Element*) const
{
}

const int* RenderThemeMac::popupButtonMargins() const
{
    static const int margins[3][4] =
    {
        { 0, 3, 1, 3 },
        { 0, 3, 2, 3 },
        { 0, 1, 0, 1 }
    };
    return margins[[popupButton() controlSize]];
}

const IntSize* RenderThemeMac::popupButtonSizes() const
{
    static const IntSize sizes[3] = { IntSize(0, 21), IntSize(0, 18), IntSize(0, 15) };
    return sizes;
}

const int* RenderThemeMac::popupButtonPadding(NSControlSize size) const
{
    static const int padding[3][4] =
    {
        { 2, 26, 3, 8 },
        { 2, 23, 3, 8 },
        { 2, 22, 3, 10 }
    };
    return padding[size];
}

bool RenderThemeMac::paintMenuList(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    setPopupButtonCellState(o, r);

    NSPopUpButtonCell* popupButton = this->popupButton();

    IntRect inflatedRect = r;
    IntSize size = popupButtonSizes()[[popupButton controlSize]];
    size.setWidth(r.width());

    // Now inflate it to account for the shadow.
    if (r.width() >= minimumMenuListSize(o->style()))
        inflatedRect = inflateRect(inflatedRect, size, popupButtonMargins());

#ifndef BUILDING_ON_TIGER
    // On Leopard, the cell will draw outside of the given rect, so we have to clip to the rect
    paintInfo.context->save();
    paintInfo.context->clip(inflatedRect);
#endif

    [popupButton drawWithFrame:inflatedRect inView:o->view()->frameView()->getDocumentView()];
    [popupButton setControlView:nil];

#ifndef BUILDING_ON_TIGER
    paintInfo.context->restore();
#endif

    return false;
}

const float baseFontSize = 11.0f;
const float baseArrowHeight = 4.0f;
const float baseArrowWidth = 5.0f;
const float baseSpaceBetweenArrows = 2.0f;
const int arrowPaddingLeft = 6;
const int arrowPaddingRight = 6;
const int paddingBeforeSeparator = 4;
const int baseBorderRadius = 5;
const int styledPopupPaddingLeft = 8;
const int styledPopupPaddingTop = 1;
const int styledPopupPaddingBottom = 2;

static void TopGradientInterpolate(void* info, const CGFloat* inData, CGFloat* outData)
{
    static float dark[4] = { 1.0f, 1.0f, 1.0f, 0.4f };
    static float light[4] = { 1.0f, 1.0f, 1.0f, 0.15f };
    float a = inData[0];
    int i = 0;
    for (i = 0; i < 4; i++)
        outData[i] = (1.0f - a) * dark[i] + a * light[i];
}

static void BottomGradientInterpolate(void* info, const CGFloat* inData, CGFloat* outData)
{
    static float dark[4] = { 1.0f, 1.0f, 1.0f, 0.0f };
    static float light[4] = { 1.0f, 1.0f, 1.0f, 0.3f };
    float a = inData[0];
    int i = 0;
    for (i = 0; i < 4; i++)
        outData[i] = (1.0f - a) * dark[i] + a * light[i];
}

static void MainGradientInterpolate(void* info, const CGFloat* inData, CGFloat* outData)
{
    static float dark[4] = { 0.0f, 0.0f, 0.0f, 0.15f };
    static float light[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
    float a = inData[0];
    int i = 0;
    for (i = 0; i < 4; i++)
        outData[i] = (1.0f - a) * dark[i] + a * light[i];
}

static void TrackGradientInterpolate(void* info, const CGFloat* inData, CGFloat* outData)
{
    static float dark[4] = { 0.0f, 0.0f, 0.0f, 0.678f };
    static float light[4] = { 0.0f, 0.0f, 0.0f, 0.13f };
    float a = inData[0];
    int i = 0;
    for (i = 0; i < 4; i++)
        outData[i] = (1.0f - a) * dark[i] + a * light[i];
}

void RenderThemeMac::paintMenuListButtonGradients(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    CGContextRef context = paintInfo.context->platformContext();

    paintInfo.context->save();

    int radius = o->style()->borderTopLeftRadius().width();

    RetainPtr<CGColorSpaceRef> cspace(AdoptCF, CGColorSpaceCreateDeviceRGB());

    FloatRect topGradient(r.x(), r.y(), r.width(), r.height() / 2.0f);
    struct CGFunctionCallbacks topCallbacks = { 0, TopGradientInterpolate, NULL };
    RetainPtr<CGFunctionRef> topFunction(AdoptCF, CGFunctionCreate(NULL, 1, NULL, 4, NULL, &topCallbacks));
    RetainPtr<CGShadingRef> topShading(AdoptCF, CGShadingCreateAxial(cspace.get(), CGPointMake(topGradient.x(), topGradient.y()), CGPointMake(topGradient.x(), topGradient.bottom()), topFunction.get(), false, false));

    FloatRect bottomGradient(r.x() + radius, r.y() + r.height() / 2.0f, r.width() - 2.0f * radius, r.height() / 2.0f);
    struct CGFunctionCallbacks bottomCallbacks = { 0, BottomGradientInterpolate, NULL };
    RetainPtr<CGFunctionRef> bottomFunction(AdoptCF, CGFunctionCreate(NULL, 1, NULL, 4, NULL, &bottomCallbacks));
    RetainPtr<CGShadingRef> bottomShading(AdoptCF, CGShadingCreateAxial(cspace.get(), CGPointMake(bottomGradient.x(),  bottomGradient.y()), CGPointMake(bottomGradient.x(), bottomGradient.bottom()), bottomFunction.get(), false, false));

    struct CGFunctionCallbacks mainCallbacks = { 0, MainGradientInterpolate, NULL };
    RetainPtr<CGFunctionRef> mainFunction(AdoptCF, CGFunctionCreate(NULL, 1, NULL, 4, NULL, &mainCallbacks));
    RetainPtr<CGShadingRef> mainShading(AdoptCF, CGShadingCreateAxial(cspace.get(), CGPointMake(r.x(),  r.y()), CGPointMake(r.x(), r.bottom()), mainFunction.get(), false, false));

    RetainPtr<CGShadingRef> leftShading(AdoptCF, CGShadingCreateAxial(cspace.get(), CGPointMake(r.x(),  r.y()), CGPointMake(r.x() + radius, r.y()), mainFunction.get(), false, false));

    RetainPtr<CGShadingRef> rightShading(AdoptCF, CGShadingCreateAxial(cspace.get(), CGPointMake(r.right(),  r.y()), CGPointMake(r.right() - radius, r.y()), mainFunction.get(), false, false));
    paintInfo.context->save();
    CGContextClipToRect(context, r);
    paintInfo.context->addRoundedRectClip(r,
        o->style()->borderTopLeftRadius(), o->style()->borderTopRightRadius(),
        o->style()->borderBottomLeftRadius(), o->style()->borderBottomRightRadius());
    CGContextDrawShading(context, mainShading.get());
    paintInfo.context->restore();

    paintInfo.context->save();
    CGContextClipToRect(context, topGradient);
    paintInfo.context->addRoundedRectClip(enclosingIntRect(topGradient),
        o->style()->borderTopLeftRadius(), o->style()->borderTopRightRadius(),
        IntSize(), IntSize());
    CGContextDrawShading(context, topShading.get());
    paintInfo.context->restore();

    paintInfo.context->save();
    CGContextClipToRect(context, bottomGradient);
    paintInfo.context->addRoundedRectClip(enclosingIntRect(bottomGradient),
        IntSize(), IntSize(),
        o->style()->borderBottomLeftRadius(), o->style()->borderBottomRightRadius());
    CGContextDrawShading(context, bottomShading.get());
    paintInfo.context->restore();

    paintInfo.context->save();
    CGContextClipToRect(context, r);
    paintInfo.context->addRoundedRectClip(r,
        o->style()->borderTopLeftRadius(), o->style()->borderTopRightRadius(),
        o->style()->borderBottomLeftRadius(), o->style()->borderBottomRightRadius());
    CGContextDrawShading(context, leftShading.get());
    CGContextDrawShading(context, rightShading.get());
    paintInfo.context->restore();

    paintInfo.context->restore();
}

bool RenderThemeMac::paintMenuListButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    paintInfo.context->save();

    IntRect bounds = IntRect(r.x() + o->style()->borderLeftWidth(),
                             r.y() + o->style()->borderTopWidth(),
                             r.width() - o->style()->borderLeftWidth() - o->style()->borderRightWidth(),
                             r.height() - o->style()->borderTopWidth() - o->style()->borderBottomWidth());
    // Draw the gradients to give the styled popup menu a button appearance
    paintMenuListButtonGradients(o, paintInfo, bounds);

    // Since we actually know the size of the control here, we restrict the font scale to make sure the arrows will fit vertically in the bounds
    float fontScale = min(o->style()->fontSize() / baseFontSize, bounds.height() / (baseArrowHeight * 2 + baseSpaceBetweenArrows));
    float centerY = bounds.y() + bounds.height() / 2.0f;
    float arrowHeight = baseArrowHeight * fontScale;
    float arrowWidth = baseArrowWidth * fontScale;
    float leftEdge = bounds.right() - arrowPaddingRight - arrowWidth;
    float spaceBetweenArrows = baseSpaceBetweenArrows * fontScale;

    if (bounds.width() < arrowWidth + arrowPaddingLeft)
        return false;
    
    paintInfo.context->setFillColor(o->style()->color());
    paintInfo.context->setStrokeStyle(NoStroke);

    FloatPoint arrow1[3];
    arrow1[0] = FloatPoint(leftEdge, centerY - spaceBetweenArrows / 2.0f);
    arrow1[1] = FloatPoint(leftEdge + arrowWidth, centerY - spaceBetweenArrows / 2.0f);
    arrow1[2] = FloatPoint(leftEdge + arrowWidth / 2.0f, centerY - spaceBetweenArrows / 2.0f - arrowHeight);

    // Draw the top arrow
    paintInfo.context->drawConvexPolygon(3, arrow1, true);

    FloatPoint arrow2[3];
    arrow2[0] = FloatPoint(leftEdge, centerY + spaceBetweenArrows / 2.0f);
    arrow2[1] = FloatPoint(leftEdge + arrowWidth, centerY + spaceBetweenArrows / 2.0f);
    arrow2[2] = FloatPoint(leftEdge + arrowWidth / 2.0f, centerY + spaceBetweenArrows / 2.0f + arrowHeight);

    // Draw the bottom arrow
    paintInfo.context->drawConvexPolygon(3, arrow2, true);

    Color leftSeparatorColor(0, 0, 0, 40);
    Color rightSeparatorColor(255, 255, 255, 40);

    // FIXME: Should the separator thickness and space be scaled up by fontScale?
    int separatorSpace = 2;
    int leftEdgeOfSeparator = static_cast<int>(leftEdge - arrowPaddingLeft); // FIXME: Round?

    // Draw the separator to the left of the arrows
    paintInfo.context->setStrokeThickness(1.0f);
    paintInfo.context->setStrokeStyle(SolidStroke);
    paintInfo.context->setStrokeColor(leftSeparatorColor);
    paintInfo.context->drawLine(IntPoint(leftEdgeOfSeparator, bounds.y()),
                                IntPoint(leftEdgeOfSeparator, bounds.bottom()));

    paintInfo.context->setStrokeColor(rightSeparatorColor);
    paintInfo.context->drawLine(IntPoint(leftEdgeOfSeparator + separatorSpace, bounds.y()),
                                IntPoint(leftEdgeOfSeparator + separatorSpace, bounds.bottom()));

    paintInfo.context->restore();
    return false;
}

void RenderThemeMac::adjustMenuListStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    NSControlSize controlSize = controlSizeForFont(style);

    style->resetBorder();
    style->resetPadding();
    
    // Height is locked to auto.
    style->setHeight(Length(Auto));

    // White-space is locked to pre
    style->setWhiteSpace(PRE);

    // Set the foreground color to black or gray when we have the aqua look.
    // Cast to RGB32 is to work around a compiler bug.
    style->setColor(e->isEnabled() ? static_cast<RGBA32>(Color::black) : Color::darkGray);

    // Set the button's vertical size.
    setButtonSize(style);

    // Our font is locked to the appropriate system font size for the control.  To clarify, we first use the CSS-specified font to figure out
    // a reasonable control size, but once that control size is determined, we throw that font away and use the appropriate
    // system font for the control size instead.
    setFontFromControlSize(selector, style, controlSize);

    style->setBoxShadow(0);
}

int RenderThemeMac::popupInternalPaddingLeft(RenderStyle* style) const
{
    if (style->appearance() == MenulistAppearance)
        return popupButtonPadding(controlSizeForFont(style))[leftPadding];
    if (style->appearance() == MenulistButtonAppearance)
        return styledPopupPaddingLeft;
    return 0;
}

int RenderThemeMac::popupInternalPaddingRight(RenderStyle* style) const
{
    if (style->appearance() == MenulistAppearance)
        return popupButtonPadding(controlSizeForFont(style))[rightPadding];
    if (style->appearance() == MenulistButtonAppearance) {
        float fontScale = style->fontSize() / baseFontSize;
        float arrowWidth = baseArrowWidth * fontScale;
        return static_cast<int>(ceilf(arrowWidth + arrowPaddingLeft + arrowPaddingRight + paddingBeforeSeparator));
    }
    return 0;
}

int RenderThemeMac::popupInternalPaddingTop(RenderStyle* style) const
{
    if (style->appearance() == MenulistAppearance)
        return popupButtonPadding(controlSizeForFont(style))[topPadding];
    if (style->appearance() == MenulistButtonAppearance)
        return styledPopupPaddingTop;
    return 0;
}

int RenderThemeMac::popupInternalPaddingBottom(RenderStyle* style) const
{
    if (style->appearance() == MenulistAppearance)
        return popupButtonPadding(controlSizeForFont(style))[bottomPadding];
    if (style->appearance() == MenulistButtonAppearance)
        return styledPopupPaddingBottom;
    return 0;
}

void RenderThemeMac::adjustMenuListButtonStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    float fontScale = style->fontSize() / baseFontSize;

    style->resetPadding();
    style->setBorderRadius(IntSize(int(baseBorderRadius + fontScale - 1), int(baseBorderRadius + fontScale - 1))); // FIXME: Round up?

    const int minHeight = 15;
    style->setMinHeight(Length(minHeight, Fixed));
    
    style->setLineHeight(RenderStyle::initialLineHeight());
}

void RenderThemeMac::setPopupButtonCellState(const RenderObject* o, const IntRect& r)
{
    NSPopUpButtonCell* popupButton = this->popupButton();

    // Set the control size based off the rectangle we're painting into.
    setControlSize(popupButton, popupButtonSizes(), r.size());

    // Update the various states we respond to.
    updateCheckedState(popupButton, o);
    updateEnabledState(popupButton, o);
    updatePressedState(popupButton, o);
    updateFocusedState(popupButton, o);
}

const IntSize* RenderThemeMac::menuListSizes() const
{
    static const IntSize sizes[3] = { IntSize(9, 0), IntSize(5, 0), IntSize(0, 0) };
    return sizes;
}

int RenderThemeMac::minimumMenuListSize(RenderStyle* style) const
{
    return sizeForSystemFont(style, menuListSizes()).width();
}

const int trackWidth = 5;
const int trackRadius = 2;

void RenderThemeMac::adjustSliderTrackStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    style->setBoxShadow(0);
}

bool RenderThemeMac::paintSliderTrack(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    IntRect bounds = r;

    if (o->style()->appearance() ==  SliderHorizontalAppearance || o->style()->appearance() ==  MediaSliderAppearance) {
        bounds.setHeight(trackWidth);
        bounds.setY(r.y() + r.height() / 2 - trackWidth / 2);
    } else if (o->style()->appearance() == SliderVerticalAppearance) {
        bounds.setWidth(trackWidth);
        bounds.setX(r.x() + r.width() / 2 - trackWidth / 2);
    }

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    CGContextRef context = paintInfo.context->platformContext();
    RetainPtr<CGColorSpaceRef> cspace(AdoptCF, CGColorSpaceCreateDeviceRGB());

    paintInfo.context->save();
    CGContextClipToRect(context, bounds);

    struct CGFunctionCallbacks mainCallbacks = { 0, TrackGradientInterpolate, NULL };
    RetainPtr<CGFunctionRef> mainFunction(AdoptCF, CGFunctionCreate(NULL, 1, NULL, 4, NULL, &mainCallbacks));
    RetainPtr<CGShadingRef> mainShading;
    if (o->style()->appearance() == SliderVerticalAppearance)
        mainShading.adoptCF(CGShadingCreateAxial(cspace.get(), CGPointMake(bounds.x(),  bounds.bottom()), CGPointMake(bounds.right(), bounds.bottom()), mainFunction.get(), false, false));
    else
        mainShading.adoptCF(CGShadingCreateAxial(cspace.get(), CGPointMake(bounds.x(),  bounds.y()), CGPointMake(bounds.x(), bounds.bottom()), mainFunction.get(), false, false));

    IntSize radius(trackRadius, trackRadius);
    paintInfo.context->addRoundedRectClip(bounds,
        radius, radius,
        radius, radius);
    CGContextDrawShading(context, mainShading.get());
    paintInfo.context->restore();
    
    return false;
}

void RenderThemeMac::adjustSliderThumbStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    style->setBoxShadow(0);
}

const float verticalSliderHeightPadding = 0.1f;

bool RenderThemeMac::paintSliderThumb(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    ASSERT(o->parent()->isSlider());

    NSSliderCell* sliderThumbCell = o->style()->appearance() == SliderThumbVerticalAppearance
        ? sliderThumbVertical()
        : sliderThumbHorizontal();

    LocalCurrentGraphicsContext localContext(paintInfo.context);

    // Update the various states we respond to.
    updateEnabledState(sliderThumbCell, o->parent());
    updateFocusedState(sliderThumbCell, o->parent());

    // Update the pressed state using the NSCell tracking methods, since that's how NSSliderCell keeps track of it.
    bool oldPressed;
    if (o->style()->appearance() == SliderThumbVerticalAppearance)
        oldPressed = m_isSliderThumbVerticalPressed;
    else
        oldPressed = m_isSliderThumbHorizontalPressed;

    bool pressed = static_cast<RenderSlider*>(o->parent())->inDragMode();

    if (o->style()->appearance() == SliderThumbVerticalAppearance)
        m_isSliderThumbVerticalPressed = pressed;
    else
        m_isSliderThumbHorizontalPressed = pressed;

    if (pressed != oldPressed) {
        if (pressed)
            [sliderThumbCell startTrackingAt:NSPoint() inView:nil];
        else
            [sliderThumbCell stopTracking:NSPoint() at:NSPoint() inView:nil mouseIsUp:YES];
    }

    FloatRect bounds = r;
    // Make the height of the vertical slider slightly larger so NSSliderCell will draw a vertical slider.
    if (o->style()->appearance() == SliderThumbVerticalAppearance)
        bounds.setHeight(bounds.height() + verticalSliderHeightPadding);

    [sliderThumbCell drawWithFrame:NSRect(bounds) inView:o->view()->frameView()->getDocumentView()];
    [sliderThumbCell setControlView:nil];

    return false;
}

const int sliderThumbWidth = 15;
const int sliderThumbHeight = 15;
const int mediaSliderThumbWidth = 13;
const int mediaSliderThumbHeight = 14;

void RenderThemeMac::adjustSliderThumbSize(RenderObject* o) const
{
    if (o->style()->appearance() == SliderThumbHorizontalAppearance || o->style()->appearance() == SliderThumbVerticalAppearance) {
        o->style()->setWidth(Length(sliderThumbWidth, Fixed));
        o->style()->setHeight(Length(sliderThumbHeight, Fixed));
    } else if (o->style()->appearance() == MediaSliderThumbAppearance) {
        o->style()->setWidth(Length(mediaSliderThumbWidth, Fixed));
        o->style()->setHeight(Length(mediaSliderThumbHeight, Fixed));
    }
}

bool RenderThemeMac::paintSearchField(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    NSSearchFieldCell* search = this->search();
    LocalCurrentGraphicsContext localContext(paintInfo.context);

    setSearchCellState(o, r);

    // Set the search button to nil before drawing.  Then reset it so we can draw it later.
    [search setSearchButtonCell:nil];

    [search drawWithFrame:NSRect(r) inView:o->view()->frameView()->getDocumentView()];
#ifdef BUILDING_ON_TIGER
    if ([search showsFirstResponder])
        wkDrawTextFieldCellFocusRing(search, NSRect(r));
#endif

    [search setControlView:nil];
    [search resetSearchButtonCell];

    return false;
}

void RenderThemeMac::setSearchCellState(RenderObject* o, const IntRect& r)
{
    NSSearchFieldCell* search = this->search();

    [search setControlSize:controlSizeForFont(o->style())];

    // Update the various states we respond to.
    updateEnabledState(search, o);
    updateFocusedState(search, o);
}

const IntSize* RenderThemeMac::searchFieldSizes() const
{
    static const IntSize sizes[3] = { IntSize(0, 22), IntSize(0, 19), IntSize(0, 17) };
    return sizes;
}

void RenderThemeMac::setSearchFieldSize(RenderStyle* style) const
{
    // If the width and height are both specified, then we have nothing to do.
    if (!style->width().isIntrinsicOrAuto() && !style->height().isAuto())
        return;
    
    // Use the font size to determine the intrinsic width of the control.
    setSizeFromFont(style, searchFieldSizes());
}

void RenderThemeMac::adjustSearchFieldStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    // Override border.
    style->resetBorder();
    const short borderWidth = 2;
    style->setBorderLeftWidth(borderWidth);
    style->setBorderLeftStyle(INSET);
    style->setBorderRightWidth(borderWidth);
    style->setBorderRightStyle(INSET);
    style->setBorderBottomWidth(borderWidth);
    style->setBorderBottomStyle(INSET);
    style->setBorderTopWidth(borderWidth);
    style->setBorderTopStyle(INSET);    
    
    // Override height.
    style->setHeight(Length(Auto));
    setSearchFieldSize(style);
    
    // Override padding size to match AppKit text positioning.
    const int padding = 1;
    style->setPaddingLeft(Length(padding, Fixed));
    style->setPaddingRight(Length(padding, Fixed));
    style->setPaddingTop(Length(padding, Fixed));
    style->setPaddingBottom(Length(padding, Fixed));
    
    NSControlSize controlSize = controlSizeForFont(style);
    setFontFromControlSize(selector, style, controlSize);

    style->setBoxShadow(0);
}

bool RenderThemeMac::paintSearchFieldCancelButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* input = o->node()->shadowAncestorNode();
    setSearchCellState(input->renderer(), r);

    NSSearchFieldCell* search = this->search();

    updatePressedState([search cancelButtonCell], o);

    NSRect bounds = [search cancelButtonRectForBounds:NSRect(input->renderer()->absoluteBoundingBoxRect())];
    [[search cancelButtonCell] drawWithFrame:bounds inView:o->view()->frameView()->getDocumentView()];
    [[search cancelButtonCell] setControlView:nil];

    return false;
}

const IntSize* RenderThemeMac::cancelButtonSizes() const
{
    static const IntSize sizes[3] = { IntSize(16, 13), IntSize(13, 11), IntSize(13, 9) };
    return sizes;
}

void RenderThemeMac::adjustSearchFieldCancelButtonStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    IntSize size = sizeForSystemFont(style, cancelButtonSizes());
    style->setWidth(Length(size.width(), Fixed));
    style->setHeight(Length(size.height(), Fixed));
    style->setBoxShadow(0);
}

const IntSize* RenderThemeMac::resultsButtonSizes() const
{
    static const IntSize sizes[3] = { IntSize(19, 13), IntSize(17, 11), IntSize(17, 9) };
    return sizes;
}

const int emptyResultsOffset = 9;
void RenderThemeMac::adjustSearchFieldDecorationStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    IntSize size = sizeForSystemFont(style, resultsButtonSizes());
    style->setWidth(Length(size.width() - emptyResultsOffset, Fixed));
    style->setHeight(Length(size.height(), Fixed));
    style->setBoxShadow(0);
}

bool RenderThemeMac::paintSearchFieldDecoration(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    return false;
}

void RenderThemeMac::adjustSearchFieldResultsDecorationStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    IntSize size = sizeForSystemFont(style, resultsButtonSizes());
    style->setWidth(Length(size.width(), Fixed));
    style->setHeight(Length(size.height(), Fixed));
    style->setBoxShadow(0);
}

bool RenderThemeMac::paintSearchFieldResultsDecoration(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* input = o->node()->shadowAncestorNode();
    setSearchCellState(input->renderer(), r);

    NSSearchFieldCell* search = this->search();

    if ([search searchMenuTemplate] != nil)
        [search setSearchMenuTemplate:nil];

    NSRect bounds = [search searchButtonRectForBounds:NSRect(input->renderer()->absoluteBoundingBoxRect())];
    [[search searchButtonCell] drawWithFrame:bounds inView:o->view()->frameView()->getDocumentView()];
    [[search searchButtonCell] setControlView:nil];
    return false;
}

const int resultsArrowWidth = 5;
void RenderThemeMac::adjustSearchFieldResultsButtonStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    IntSize size = sizeForSystemFont(style, resultsButtonSizes());
    style->setWidth(Length(size.width() + resultsArrowWidth, Fixed));
    style->setHeight(Length(size.height(), Fixed));
    style->setBoxShadow(0);
}

bool RenderThemeMac::paintSearchFieldResultsButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* input = o->node()->shadowAncestorNode();
    setSearchCellState(input->renderer(), r);

    NSSearchFieldCell* search = this->search();

    if (![search searchMenuTemplate])
        [search setSearchMenuTemplate:searchMenuTemplate()];

    NSRect bounds = [search searchButtonRectForBounds:NSRect(input->renderer()->absoluteBoundingBoxRect())];
    [[search searchButtonCell] drawWithFrame:bounds inView:o->view()->frameView()->getDocumentView()];
    [[search searchButtonCell] setControlView:nil];
    return false;
}

bool RenderThemeMac::paintMediaFullscreenButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    if (!node)
        return false;

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawMediaFullscreenButton(paintInfo.context->platformContext(), r, node->active());
    return false;
}

bool RenderThemeMac::paintMediaMuteButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    Node* mediaNode = node ? node->shadowAncestorNode() : 0;
    if (!mediaNode || (!mediaNode->hasTagName(videoTag) && !mediaNode->hasTagName(audioTag)))
        return false;

    HTMLMediaElement* mediaElement = static_cast<HTMLMediaElement*>(mediaNode);
    if (!mediaElement)
        return false;
    
    LocalCurrentGraphicsContext localContext(paintInfo.context);
    if (mediaElement->muted())
        wkDrawMediaUnMuteButton(paintInfo.context->platformContext(), r, node->active());
    else
        wkDrawMediaMuteButton(paintInfo.context->platformContext(), r, node->active());        
    return false;
}

bool RenderThemeMac::paintMediaPlayButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    Node* mediaNode = node ? node->shadowAncestorNode() : 0;
    if (!mediaNode || (!mediaNode->hasTagName(videoTag) && !mediaNode->hasTagName(audioTag)))
        return false;

    HTMLMediaElement* mediaElement = static_cast<HTMLMediaElement*>(mediaNode);
    if (!mediaElement)
        return false;

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    if (mediaElement->canPlay())
        wkDrawMediaPlayButton(paintInfo.context->platformContext(), r, node->active());
    else
        wkDrawMediaPauseButton(paintInfo.context->platformContext(), r, node->active());        
    return false;
}

bool RenderThemeMac::paintMediaSeekBackButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    if (!node)
        return false;

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawMediaSeekBackButton(paintInfo.context->platformContext(), r, node->active());
    return false;
}

bool RenderThemeMac::paintMediaSeekForwardButton(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    if (!node)
        return false;

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawMediaSeekForwardButton(paintInfo.context->platformContext(), r, node->active());
    return false;
}

bool RenderThemeMac::paintMediaSliderTrack(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    Node* mediaNode = node ? node->shadowAncestorNode() : 0;
    if (!mediaNode || (!mediaNode->hasTagName(videoTag) && !mediaNode->hasTagName(audioTag)))
        return false;

    HTMLMediaElement* mediaElement = static_cast<HTMLMediaElement*>(mediaNode);
    if (!mediaElement)
        return false;

    float percentLoaded = 0;
    if (MediaPlayer* player = mediaElement->player())
        if (player->duration())
            percentLoaded = player->maxTimeBuffered() / player->duration();

    wkDrawMediaSliderTrack(paintInfo.context->platformContext(), r, percentLoaded);
    return false;
}

bool RenderThemeMac::paintMediaSliderThumb(RenderObject* o, const RenderObject::PaintInfo& paintInfo, const IntRect& r)
{
    Node* node = o->element();
    if (!node)
        return false;

    LocalCurrentGraphicsContext localContext(paintInfo.context);
    wkDrawMediaSliderThumb(paintInfo.context->platformContext(), r, node->active());
    return false;
}

NSButtonCell* RenderThemeMac::checkbox() const
{
    if (!m_checkbox) {
        m_checkbox.adoptNS([[NSButtonCell alloc] init]);
        [m_checkbox.get() setButtonType:NSSwitchButton];
        [m_checkbox.get() setTitle:nil];
        [m_checkbox.get() setAllowsMixedState:YES];
        [m_checkbox.get() setFocusRingType:NSFocusRingTypeExterior];
    }
    
    return m_checkbox.get();
}

NSButtonCell* RenderThemeMac::radio() const
{
    if (!m_radio) {
        m_radio.adoptNS([[NSButtonCell alloc] init]);
        [m_radio.get() setButtonType:NSRadioButton];
        [m_radio.get() setTitle:nil];
        [m_radio.get() setFocusRingType:NSFocusRingTypeExterior];
    }
    
    return m_radio.get();
}

NSButtonCell* RenderThemeMac::button() const
{
    if (!m_button) {
        m_button.adoptNS([[NSButtonCell alloc] init]);
        [m_button.get() setTitle:nil];
        [m_button.get() setButtonType:NSMomentaryPushInButton];
    }
    
    return m_button.get();
}

NSPopUpButtonCell* RenderThemeMac::popupButton() const
{
    if (!m_popupButton) {
        m_popupButton.adoptNS([[NSPopUpButtonCell alloc] initTextCell:@"" pullsDown:NO]);
        [m_popupButton.get() setUsesItemFromMenu:NO];
        [m_popupButton.get() setFocusRingType:NSFocusRingTypeExterior];
    }
    
    return m_popupButton.get();
}

NSSearchFieldCell* RenderThemeMac::search() const
{
    if (!m_search) {
        m_search.adoptNS([[NSSearchFieldCell alloc] initTextCell:@""]);
        [m_search.get() setBezelStyle:NSTextFieldRoundedBezel];
        [m_search.get() setBezeled:YES];
        [m_search.get() setEditable:YES];
        [m_search.get() setFocusRingType:NSFocusRingTypeExterior];
    }

    return m_search.get();
}

NSMenu* RenderThemeMac::searchMenuTemplate() const
{
    if (!m_searchMenuTemplate)
        m_searchMenuTemplate.adoptNS([[NSMenu alloc] initWithTitle:@""]);

    return m_searchMenuTemplate.get();
}

NSSliderCell* RenderThemeMac::sliderThumbHorizontal() const
{
    if (!m_sliderThumbHorizontal) {
        m_sliderThumbHorizontal.adoptNS([[NSSliderCell alloc] init]);
        [m_sliderThumbHorizontal.get() setTitle:nil];
        [m_sliderThumbHorizontal.get() setSliderType:NSLinearSlider];
        [m_sliderThumbHorizontal.get() setControlSize:NSSmallControlSize];
        [m_sliderThumbHorizontal.get() setFocusRingType:NSFocusRingTypeExterior];
    }
    
    return m_sliderThumbHorizontal.get();
}

NSSliderCell* RenderThemeMac::sliderThumbVertical() const
{
    if (!m_sliderThumbVertical) {
        m_sliderThumbVertical.adoptNS([[NSSliderCell alloc] init]);
        [m_sliderThumbVertical.get() setTitle:nil];
        [m_sliderThumbVertical.get() setSliderType:NSLinearSlider];
        [m_sliderThumbVertical.get() setControlSize:NSSmallControlSize];
        [m_sliderThumbVertical.get() setFocusRingType:NSFocusRingTypeExterior];
    }
    
    return m_sliderThumbVertical.get();
}

} // namespace WebCore
