/*
 * Copyright (C) 2007 Apple Inc.
 * Copyright (C) 2007 Alp Toker <alp@atoker.com>
 * Copyright (C) 2008 Collabora Ltd.
 * Copyright (C) 2008, 2009 Google 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 "RenderThemeChromiumSkia.h"

#include "CSSValueKeywords.h"
#include "CurrentTime.h"
#include "GraphicsContext.h"
#include "HTMLMediaElement.h"
#include "HTMLNames.h"
#include "Image.h"
#include "MediaControlElements.h"
#include "PaintInfo.h"
#include "PlatformBridge.h"
#include "PlatformContextSkia.h"
#include "RenderBox.h"
#include "RenderMediaControlsChromium.h"
#include "RenderObject.h"
#include "RenderProgress.h"
#include "RenderSlider.h"
#include "ScrollbarTheme.h"
#include "TimeRanges.h"
#include "TransformationMatrix.h"
#include "UserAgentStyleSheets.h"

#include "SkShader.h"
#include "SkGradientShader.h"

namespace WebCore {

enum PaddingType {
    TopPadding,
    RightPadding,
    BottomPadding,
    LeftPadding
};

static const int styledMenuListInternalPadding[4] = { 1, 4, 1, 4 };

// These values all match Safari/Win.
static const float defaultControlFontPixelSize = 13;
static const float defaultCancelButtonSize = 9;
static const float minCancelButtonSize = 5;
static const float maxCancelButtonSize = 21;
static const float defaultSearchFieldResultsDecorationSize = 13;
static const float minSearchFieldResultsDecorationSize = 9;
static const float maxSearchFieldResultsDecorationSize = 30;
static const float defaultSearchFieldResultsButtonWidth = 18;

// We aim to match IE here.
// -IE uses a font based on the encoding as the default font for form controls.
// -Gecko uses MS Shell Dlg (actually calls GetStockObject(DEFAULT_GUI_FONT),
// which returns MS Shell Dlg)
// -Safari uses Lucida Grande.
//
// FIXME: The only case where we know we don't match IE is for ANSI encodings.
// IE uses MS Shell Dlg there, which we render incorrectly at certain pixel
// sizes (e.g. 15px). So, for now we just use Arial.
const String& RenderThemeChromiumSkia::defaultGUIFont()
{
    DEFINE_STATIC_LOCAL(String, fontFace, ("Arial"));
    return fontFace;
}

float RenderThemeChromiumSkia::defaultFontSize = 16.0;

RenderThemeChromiumSkia::RenderThemeChromiumSkia()
{
}

RenderThemeChromiumSkia::~RenderThemeChromiumSkia()
{
}

// Use the Windows style sheets to match their metrics.
String RenderThemeChromiumSkia::extraDefaultStyleSheet()
{
    return String(themeWinUserAgentStyleSheet, sizeof(themeWinUserAgentStyleSheet)) +
           String(themeChromiumSkiaUserAgentStyleSheet, sizeof(themeChromiumSkiaUserAgentStyleSheet));
}

String RenderThemeChromiumSkia::extraQuirksStyleSheet()
{
    return String(themeWinQuirksUserAgentStyleSheet, sizeof(themeWinQuirksUserAgentStyleSheet));
}

#if ENABLE(VIDEO)
String RenderThemeChromiumSkia::extraMediaControlsStyleSheet()
{
    return String(mediaControlsChromiumUserAgentStyleSheet, sizeof(mediaControlsChromiumUserAgentStyleSheet));
}
#endif

bool RenderThemeChromiumSkia::supportsHover(const RenderStyle* style) const
{
    return true;
}

bool RenderThemeChromiumSkia::supportsFocusRing(const RenderStyle* style) const
{
    // This causes WebKit to draw the focus rings for us.
    return false;
}

Color RenderThemeChromiumSkia::platformActiveSelectionBackgroundColor() const
{
    return Color(0x1e, 0x90, 0xff);
}

Color RenderThemeChromiumSkia::platformInactiveSelectionBackgroundColor() const
{
    return Color(0xc8, 0xc8, 0xc8);
}

Color RenderThemeChromiumSkia::platformActiveSelectionForegroundColor() const
{
    return Color::black;
}

Color RenderThemeChromiumSkia::platformInactiveSelectionForegroundColor() const
{
    return Color(0x32, 0x32, 0x32);
}

Color RenderThemeChromiumSkia::platformFocusRingColor() const
{
    static Color focusRingColor(229, 151, 0, 255);
    return focusRingColor;
}

double RenderThemeChromiumSkia::caretBlinkInterval() const
{
    // Disable the blinking caret in layout test mode, as it introduces
    // a race condition for the pixel tests. http://b/1198440
    if (PlatformBridge::layoutTestMode())
        return 0;

    return caretBlinkIntervalInternal();
}

void RenderThemeChromiumSkia::systemFont(int propId, FontDescription& fontDescription) const
{
    float fontSize = defaultFontSize;

    switch (propId) {
    case CSSValueWebkitMiniControl:
    case CSSValueWebkitSmallControl:
    case CSSValueWebkitControl:
        // Why 2 points smaller? Because that's what Gecko does. Note that we
        // are assuming a 96dpi screen, which is the default that we use on
        // Windows.
        static const float pointsPerInch = 72.0f;
        static const float pixelsPerInch = 96.0f;
        fontSize -= (2.0f / pointsPerInch) * pixelsPerInch;
        break;
    }

    fontDescription.firstFamily().setFamily(defaultGUIFont());
    fontDescription.setSpecifiedSize(fontSize);
    fontDescription.setIsAbsoluteSize(true);
    fontDescription.setGenericFamily(FontDescription::NoFamily);
    fontDescription.setWeight(FontWeightNormal);
    fontDescription.setItalic(false);
}

int RenderThemeChromiumSkia::minimumMenuListSize(RenderStyle* style) const
{
    return 0;
}

// These are the default dimensions of radio buttons and checkboxes.
static const int widgetStandardWidth = 13;
static const int widgetStandardHeight = 13;

// Return a rectangle that has the same center point as |original|, but with a
// size capped at |width| by |height|.
IntRect center(const IntRect& original, int width, int height)
{
    width = std::min(original.width(), width);
    height = std::min(original.height(), height);
    int x = original.x() + (original.width() - width) / 2;
    int y = original.y() + (original.height() - height) / 2;

    return IntRect(x, y, width, height);
}

void RenderThemeChromiumSkia::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;

    // FIXME:  A hard-coded size of 13 is used.  This is wrong but necessary
    // for now.  It matches Firefox.  At different DPI settings on Windows,
    // querying the theme gives you a larger size that accounts for the higher
    // DPI.  Until our entire engine honors a DPI setting other than 96, we
    // can't rely on the theme's metrics.
    const IntSize size(widgetStandardWidth, widgetStandardHeight);
    setSizeIfAuto(style, size);
}

void RenderThemeChromiumSkia::setRadioSize(RenderStyle* style) const
{
    // Use same sizing for radio box as checkbox.
    setCheckboxSize(style);
}

void RenderThemeChromiumSkia::adjustButtonStyle(CSSStyleSelector*, RenderStyle* style, Element*) const
{
    if (style->appearance() == PushButtonPart) {
        // Ignore line-height.
        style->setLineHeight(RenderStyle::initialLineHeight());
    }
}

bool RenderThemeChromiumSkia::paintTextArea(RenderObject* o, const PaintInfo& i, const IntRect& r)
{
    return paintTextField(o, i, r);
}

void RenderThemeChromiumSkia::adjustSearchFieldStyle(CSSStyleSelector*, RenderStyle* style, Element*) const
{
     // Ignore line-height.
     style->setLineHeight(RenderStyle::initialLineHeight());
}

bool RenderThemeChromiumSkia::paintSearchField(RenderObject* o, const PaintInfo& i, const IntRect& r)
{
    return paintTextField(o, i, r);
}

void RenderThemeChromiumSkia::adjustSearchFieldCancelButtonStyle(CSSStyleSelector*, RenderStyle* style, Element*) const
{
    // Scale the button size based on the font size
    float fontScale = style->fontSize() / defaultControlFontPixelSize;
    int cancelButtonSize = lroundf(std::min(std::max(minCancelButtonSize, defaultCancelButtonSize * fontScale), maxCancelButtonSize));
    style->setWidth(Length(cancelButtonSize, Fixed));
    style->setHeight(Length(cancelButtonSize, Fixed));
}

IntRect RenderThemeChromiumSkia::convertToPaintingRect(RenderObject* inputRenderer, const RenderObject* partRenderer, IntRect partRect, const IntRect& localOffset) const
{
    // Compute an offset between the part renderer and the input renderer.
    IntSize offsetFromInputRenderer = -(partRenderer->offsetFromAncestorContainer(inputRenderer));
    // Move the rect into partRenderer's coords.
    partRect.move(offsetFromInputRenderer);
    // Account for the local drawing offset.
    partRect.move(localOffset.x(), localOffset.y());

    return partRect;
}

bool RenderThemeChromiumSkia::paintSearchFieldCancelButton(RenderObject* cancelButtonObject, const PaintInfo& paintInfo, const IntRect& r)
{
    // Get the renderer of <input> element.
    Node* input = cancelButtonObject->node()->shadowAncestorNode();
    if (!input->renderer()->isBox())
        return false;
    RenderBox* inputRenderBox = toRenderBox(input->renderer());
    IntRect inputContentBox = inputRenderBox->contentBoxRect();

    // Make sure the scaled button stays square and will fit in its parent's box.
    int cancelButtonSize = std::min(inputContentBox.width(), std::min(inputContentBox.height(), r.height()));
    // Calculate cancel button's coordinates relative to the input element.
    // Center the button vertically.  Round up though, so if it has to be one pixel off-center, it will
    // be one pixel closer to the bottom of the field.  This tends to look better with the text.
    IntRect cancelButtonRect(cancelButtonObject->offsetFromAncestorContainer(inputRenderBox).width(),
                             inputContentBox.y() + (inputContentBox.height() - cancelButtonSize + 1) / 2,
                             cancelButtonSize, cancelButtonSize);
    IntRect paintingRect = convertToPaintingRect(inputRenderBox, cancelButtonObject, cancelButtonRect, r);

    static Image* cancelImage = Image::loadPlatformResource("searchCancel").releaseRef();
    static Image* cancelPressedImage = Image::loadPlatformResource("searchCancelPressed").releaseRef();
    paintInfo.context->drawImage(isPressed(cancelButtonObject) ? cancelPressedImage : cancelImage,
                                 cancelButtonObject->style()->colorSpace(), paintingRect);
    return false;
}

void RenderThemeChromiumSkia::adjustSearchFieldDecorationStyle(CSSStyleSelector*, RenderStyle* style, Element*) const
{
    IntSize emptySize(1, 11);
    style->setWidth(Length(emptySize.width(), Fixed));
    style->setHeight(Length(emptySize.height(), Fixed));
}

void RenderThemeChromiumSkia::adjustSearchFieldResultsDecorationStyle(CSSStyleSelector*, RenderStyle* style, Element*) const
{
    // Scale the decoration size based on the font size
    float fontScale = style->fontSize() / defaultControlFontPixelSize;
    int magnifierSize = lroundf(std::min(std::max(minSearchFieldResultsDecorationSize, defaultSearchFieldResultsDecorationSize * fontScale),
                                         maxSearchFieldResultsDecorationSize));
    style->setWidth(Length(magnifierSize, Fixed));
    style->setHeight(Length(magnifierSize, Fixed));
}

bool RenderThemeChromiumSkia::paintSearchFieldResultsDecoration(RenderObject* magnifierObject, const PaintInfo& paintInfo, const IntRect& r)
{
    // Get the renderer of <input> element.
    Node* input = magnifierObject->node()->shadowAncestorNode();
    if (!input->renderer()->isBox())
        return false;
    RenderBox* inputRenderBox = toRenderBox(input->renderer());
    IntRect inputContentBox = inputRenderBox->contentBoxRect();

    // Make sure the scaled decoration stays square and will fit in its parent's box.
    int magnifierSize = std::min(inputContentBox.width(), std::min(inputContentBox.height(), r.height()));
    // Calculate decoration's coordinates relative to the input element.
    // Center the decoration vertically.  Round up though, so if it has to be one pixel off-center, it will
    // be one pixel closer to the bottom of the field.  This tends to look better with the text.
    IntRect magnifierRect(magnifierObject->offsetFromAncestorContainer(inputRenderBox).width(),
                          inputContentBox.y() + (inputContentBox.height() - magnifierSize + 1) / 2,
                          magnifierSize, magnifierSize);
    IntRect paintingRect = convertToPaintingRect(inputRenderBox, magnifierObject, magnifierRect, r);

    static Image* magnifierImage = Image::loadPlatformResource("searchMagnifier").releaseRef();
    paintInfo.context->drawImage(magnifierImage, magnifierObject->style()->colorSpace(), paintingRect);
    return false;
}

void RenderThemeChromiumSkia::adjustSearchFieldResultsButtonStyle(CSSStyleSelector*, RenderStyle* style, Element*) const
{
    // Scale the button size based on the font size
    float fontScale = style->fontSize() / defaultControlFontPixelSize;
    int magnifierHeight = lroundf(std::min(std::max(minSearchFieldResultsDecorationSize, defaultSearchFieldResultsDecorationSize * fontScale),
                                           maxSearchFieldResultsDecorationSize));
    int magnifierWidth = lroundf(magnifierHeight * defaultSearchFieldResultsButtonWidth / defaultSearchFieldResultsDecorationSize);
    style->setWidth(Length(magnifierWidth, Fixed));
    style->setHeight(Length(magnifierHeight, Fixed));
}

bool RenderThemeChromiumSkia::paintSearchFieldResultsButton(RenderObject* magnifierObject, const PaintInfo& paintInfo, const IntRect& r)
{
    // Get the renderer of <input> element.
    Node* input = magnifierObject->node()->shadowAncestorNode();
    if (!input->renderer()->isBox())
        return false;
    RenderBox* inputRenderBox = toRenderBox(input->renderer());
    IntRect inputContentBox = inputRenderBox->contentBoxRect();

    // Make sure the scaled decoration will fit in its parent's box.
    int magnifierHeight = std::min(inputContentBox.height(), r.height());
    int magnifierWidth = std::min(inputContentBox.width(), static_cast<int>(magnifierHeight * defaultSearchFieldResultsButtonWidth / defaultSearchFieldResultsDecorationSize));
    IntRect magnifierRect(magnifierObject->offsetFromAncestorContainer(inputRenderBox).width(),
                          inputContentBox.y() + (inputContentBox.height() - magnifierHeight + 1) / 2,
                          magnifierWidth, magnifierHeight);
    IntRect paintingRect = convertToPaintingRect(inputRenderBox, magnifierObject, magnifierRect, r);

    static Image* magnifierImage = Image::loadPlatformResource("searchMagnifierResults").releaseRef();
    paintInfo.context->drawImage(magnifierImage, magnifierObject->style()->colorSpace(), paintingRect);
    return false;
}

bool RenderThemeChromiumSkia::paintMediaControlsBackground(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaTimelineContainer, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

bool RenderThemeChromiumSkia::paintMediaSliderTrack(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaSlider, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

bool RenderThemeChromiumSkia::paintMediaVolumeSliderTrack(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaVolumeSlider, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

void RenderThemeChromiumSkia::adjustSliderThumbSize(RenderObject* object) const
{
#if ENABLE(VIDEO)
    RenderMediaControlsChromium::adjustMediaSliderThumbSize(object);
#else
    UNUSED_PARAM(object);
#endif
}

bool RenderThemeChromiumSkia::paintMediaSliderThumb(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaSliderThumb, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

bool RenderThemeChromiumSkia::paintMediaVolumeSliderThumb(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaVolumeSliderThumb, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

bool RenderThemeChromiumSkia::paintMediaPlayButton(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaPlayButton, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

bool RenderThemeChromiumSkia::paintMediaMuteButton(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
{
#if ENABLE(VIDEO)
    return RenderMediaControlsChromium::paintMediaControlsPart(MediaMuteButton, object, paintInfo, rect);
#else
    UNUSED_PARAM(object);
    UNUSED_PARAM(paintInfo);
    UNUSED_PARAM(rect);
    return false;
#endif
}

void RenderThemeChromiumSkia::adjustMenuListStyle(CSSStyleSelector* selector, RenderStyle* style, WebCore::Element* e) const
{
    // Height is locked to auto on all browsers.
    style->setLineHeight(RenderStyle::initialLineHeight());
}

void RenderThemeChromiumSkia::adjustMenuListButtonStyle(CSSStyleSelector* selector, RenderStyle* style, Element* e) const
{
    adjustMenuListStyle(selector, style, e);
}

// Used to paint styled menulists (i.e. with a non-default border)
bool RenderThemeChromiumSkia::paintMenuListButton(RenderObject* o, const PaintInfo& i, const IntRect& rect)
{
    return paintMenuList(o, i, rect);
}

int RenderThemeChromiumSkia::popupInternalPaddingLeft(RenderStyle* style) const
{
    return menuListInternalPadding(style, LeftPadding);
}

int RenderThemeChromiumSkia::popupInternalPaddingRight(RenderStyle* style) const
{
    return menuListInternalPadding(style, RightPadding);
}

int RenderThemeChromiumSkia::popupInternalPaddingTop(RenderStyle* style) const
{
    return menuListInternalPadding(style, TopPadding);
}

int RenderThemeChromiumSkia::popupInternalPaddingBottom(RenderStyle* style) const
{
    return menuListInternalPadding(style, BottomPadding);
}

// static
void RenderThemeChromiumSkia::setDefaultFontSize(int fontSize)
{
    defaultFontSize = static_cast<float>(fontSize);
}

double RenderThemeChromiumSkia::caretBlinkIntervalInternal() const
{
    return RenderTheme::caretBlinkInterval();
}

// static
void RenderThemeChromiumSkia::setSizeIfAuto(RenderStyle* style, const IntSize& size)
{
    if (style->width().isIntrinsicOrAuto())
        style->setWidth(Length(size.width(), Fixed));
    if (style->height().isAuto())
        style->setHeight(Length(size.height(), Fixed));
}

int RenderThemeChromiumSkia::menuListInternalPadding(RenderStyle* style, int paddingType) const
{
    // This internal padding is in addition to the user-supplied padding.
    // Matches the FF behavior.
    int padding = styledMenuListInternalPadding[paddingType];

    // Reserve the space for right arrow here. The rest of the padding is
    // set by adjustMenuListStyle, since PopMenuWin.cpp uses the padding from
    // RenderMenuList to lay out the individual items in the popup.
    // If the MenuList actually has appearance "NoAppearance", then that means
    // we don't draw a button, so don't reserve space for it.
    const int barType = style->direction() == LTR ? RightPadding : LeftPadding;
    if (paddingType == barType && style->appearance() != NoControlPart)
        padding += ScrollbarTheme::nativeTheme()->scrollbarThickness();

    return padding;
}

#if ENABLE(PROGRESS_TAG)

//
// Following values are come from default of GTK+
//
static const int progressDeltaPixelsPerSecond = 100;
static const int progressActivityBlocks = 5;
static const int progressAnimationFrmaes = 10;
static const double progressAnimationInterval = 0.125;

IntRect RenderThemeChromiumSkia::determinateProgressValueRectFor(RenderProgress* renderProgress, const IntRect& rect) const
{
    int dx = rect.width() * renderProgress->position();
    if (renderProgress->style()->direction() == RTL)
        return IntRect(rect.x() + rect.width() - dx, rect.y(), dx, rect.height());
    return IntRect(rect.x(), rect.y(), dx, rect.height());
}

IntRect RenderThemeChromiumSkia::indeterminateProgressValueRectFor(RenderProgress* renderProgress, const IntRect& rect) const
{

    int valueWidth = rect.width() / progressActivityBlocks;
    int movableWidth = rect.width() - valueWidth;
    if (movableWidth <= 0)
        return IntRect();

    double progress = renderProgress->animationProgress();
    if (progress < 0.5)
        return IntRect(rect.x() + progress * 2 * movableWidth, rect.y(), valueWidth, rect.height());
    return IntRect(rect.x() + (1.0 - progress) * 2 * movableWidth, rect.y(), valueWidth, rect.height());
}

double RenderThemeChromiumSkia::animationRepeatIntervalForProgressBar(RenderProgress*) const
{
    return progressAnimationInterval;
}

double RenderThemeChromiumSkia::animationDurationForProgressBar(RenderProgress* renderProgress) const
{
    return progressAnimationInterval * progressAnimationFrmaes * 2; // "2" for back and forth
}

IntRect RenderThemeChromiumSkia::progressValueRectFor(RenderProgress* renderProgress, const IntRect& rect) const
{
    return renderProgress->isDeterminate() ? determinateProgressValueRectFor(renderProgress, rect) : indeterminateProgressValueRectFor(renderProgress, rect);
}

#endif

} // namespace WebCore