/*

* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  

*

*/

#include "config.h"

#include "Font.h"

#include "TextStyle.h"

#include "FontData.h"

#include "FontFallbackList.h"

#include "GraphicsContext.h"

#include "IntRect.h"

#include "WebCoreGraphicsContext.h"

#include <e32std.h>

#include <BITSTD.H>

#include <gdi.h>

#include "StaticObjectsContainer.h"

#include "PictographSymbian.h"

#include "ZoomFactor.h"

#include "PlatformFontCache.h"

namespace WebCore {

static void notSupported() { __ASSERT_ALWAYS( 0, User::Panic( _L("Font:"), 1 ) ); }

void Font::drawGlyphs(GraphicsContext* graphicsContext, const FontData* font, const GlyphBuffer& glyphBuffer,

                      int from, int numGlyphs, const FloatPoint& point) const

{

    notSupported();

}

FloatRect Font::selectionRectForComplexText(const TextRun& run, const TextStyle& style, const IntPoint& point, int h, int from, int to) const

{

    float b = 0;

    if (from>0) {

        TextRun begin(run.characters(), from);

        b = floatWidthForComplexText(begin, style);

    }

    TextRun end(run.characters() + from, to - from);

    float w = floatWidthForComplexText(end, style);        

    FloatRect rect(b + point.x(), point.y(), w, h);

    return rect;

}

void Font::drawComplexText(GraphicsContext* graphicsContext, const TextRun& run, const TextStyle& style, const FloatPoint& point, int from, int to) const                          

{

    PlatformFontCache* cache = StaticObjectsContainer::instance()->fontCache();

    CFont* font = cache->zoomedFont(m_fontDescription, cache->fontZoomFactor());

    // RenderBlock::layoutColumns create a 0 platform context to do a faked paint

    // during layout - weird stuff :)

    if (!graphicsContext->platformContext())

        return;

    CFbsBitGc& bitgc = graphicsContext->platformContext()->gc();

    Color c = graphicsContext->fillColor();

    bitgc.SetPenColor( TRgb( c.red(), c.green(), c.blue(), c.alpha() ) );

    bitgc.UseFontNoDuplicate( static_cast<const CFbsBitGcFont*>(font) );

    TPoint startPos = point;

    if (from) {

        // the text run before the selection

        TextRun leftRun(run.characters(), from);

        // the selection start point

        startPos.iX += floatWidthForComplexText(leftRun, style);

    }

    TPtrC str( (const TUint16*)(run.characters() + from), to - from);

    TInt numSpaces(0);

    TInt indexOfFirstNonRegularSpace(-1);

    TInt strLength(str.Length());

    // a) search for nbsp and similar

    // b) count the spaces for word spacing

    for( TInt n = 0; n<strLength; ++n) {

        if ( str[n] == ' ' ) {

            numSpaces++;

        }

        else if( TChar(str[n]).IsSpace() ) {

            if (indexOfFirstNonRegularSpace==-1) {

                indexOfFirstNonRegularSpace = n;

            }

            numSpaces++;

            if( m_wordSpacing==0 || style.padding()==0 ) {

                break;

            }

        }

    }

    // letter spacing

    bitgc.SetCharJustification(m_letterSpacing*str.Length(),str.Length());

    // word spacing

    bitgc.SetWordJustification(m_wordSpacing*numSpaces + style.padding(), numSpaces);

    // see if we need a temporary buffer

    if( indexOfFirstNonRegularSpace > -1 || isSmallCaps() || style.rtl()){

        HBufC* text = 0;

        text = str.Alloc();

        if (text){

            TPtr newStr(text->Des());

            if (isSmallCaps()) {

                // proper small caps implementation would use smaller font, but that get complicated

                // just upper case for now

                newStr.UpperCase();

            }

            // if we have non-regular spaces (nbsp, tab, etc.) we need to make a copy

            // and replace them with regular spaces. otherwise they show up as boxes.

            if (indexOfFirstNonRegularSpace > -1) {

                for(; indexOfFirstNonRegularSpace<strLength; ++indexOfFirstNonRegularSpace ) {

                        newStr[indexOfFirstNonRegularSpace] = ' ';

                    }

                }

            }

            if (style.rtl()) {

                TBidiText* bidiText = TBidiText::NewL( newStr, 1, TBidiText::ERightToLeft );

                bidiText->WrapText(xForm(width(run)), *font );

                bitgc.DrawText( bidiText->DisplayText(),xForm(startPos)); 

                delete bidiText;      

            }

            else{

                bitgc.DrawText( newStr, xForm(startPos) );   	

            }

            if (graphicsContext && StaticObjectsContainer::instance()->pictograph())

                StaticObjectsContainer::instance()->pictograph()->DrawPictographsInText(graphicsContext->platformContext(), bitgc, *font, newStr, startPos );

            delete text;

        }

    }else {

        bitgc.DrawText( str, xForm(startPos) );

        if (graphicsContext && StaticObjectsContainer::instance()->pictograph())        

            StaticObjectsContainer::instance()->pictograph()->DrawPictographsInText(graphicsContext->platformContext(), bitgc, *font, str, startPos );

    }

    bitgc.DiscardFont();

}

inline float floatWidthForComplexTextSymbian(const Font* f, const TextRun& run,  const TextStyle& style, int maxWidth, int& chars){

    const CFont& font( f->primaryFont()->platformData() );

    TPtrC str( (const TUint16*)(run.characters()), run.length());

    TInt numSpaces(0);

    TInt indexOfFirstNonRegularSpace(-1);

    TInt strLength(str.Length());

    // count the spaces for word spacing

    // a) search for nbsp and similar

    // b) count the spaces for word spacing

    for( TInt n = 0; n<strLength; ++n)

        {

        if ( str[n] == ' ' )

                {

                numSpaces++;

                }

        else if( TChar(str[n]).IsSpace() )

            {

            if (indexOfFirstNonRegularSpace==-1)

                {

                indexOfFirstNonRegularSpace = n;

                }

            numSpaces++;

            if ( f->wordSpacing() == 0 || style.padding() == 0 )

                break;

            }

        }

    CFont::TMeasureTextInput input;

    input.iCharJustExcess = str.Length() * f->letterSpacing();

    input.iCharJustNum = str.Length();

    input.iWordJustExcess = numSpaces * f->wordSpacing();

    input.iWordJustNum = numSpaces;

    if (maxWidth>0)

        input.iMaxAdvance = maxWidth;

    CFont::TMeasureTextOutput output;

    //input.iMaxAdvance = aMaxAdvance;

    // see if we need a temporary buffer

    if( indexOfFirstNonRegularSpace > -1 || f->isSmallCaps() ){

        HBufC* text = str.Alloc();

        // don't bother to reverse order for right-to-left, assume the length will be the same

        if (text){

            TPtr newStr(text->Des());

            if ( f->isSmallCaps() )

                {

                // proper small caps implementation would use smaller font, but that get complicated

                // just upper case for now

                newStr.UpperCase();

                }

            // if we have non-regular spaces (nbsp, tab, etc.) we need to make a copy

            // and replace them with regular spaces. otherwise they show up as boxes.

            if (indexOfFirstNonRegularSpace > -1)

                {

                for(; indexOfFirstNonRegularSpace<strLength; ++indexOfFirstNonRegularSpace )

                    {

                    if( TChar(newStr[indexOfFirstNonRegularSpace]).IsSpace() )

                        {

                        newStr[indexOfFirstNonRegularSpace] = ' ';

                        }

                    }

                }

            // FIXME: should use smallcap font, which has smaller font size than the current font

            TInt w = font.MeasureText(*text,&input,&output);

            delete text;

            chars = output.iChars;

            return w;

            }

        }

    TInt w = font.MeasureText(str,&input,&output);

    chars = output.iChars;

    return w;

}

float Font::floatWidthForComplexText(const TextRun& run, const TextStyle& style) const

{

    int chars;

    return floatWidthForComplexTextSymbian(this, run, style, -1, chars);

}

int Font::offsetForPositionForComplexText(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const

{

    int chars;

    floatWidthForComplexTextSymbian(this, run, style, x, chars);

    return chars;

}

}