// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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 <fntstore.h>

#include <bitdraw.h>

#include <bitstd.h>

#include <bitdev.h>

#include "BITPANIC.H"

#include <shapeinfo.h>

#include <bmalphablend.h>

#include <bitdrawinterfaceid.h>

#include <graphics/fbsrasterizer.h>

#include "bitgcextradata.h"

#include <graphics/gdi/gdiconsts.h>

#include <graphics/gdi/gdistructs.h>

/** Draws text at the last print position.

@param aText The text string to be drawn. */

EXPORT_C void CFbsBitGc::DrawText(const TDesC& aText)

	{

	TTextParameters* param = NULL;

	DrawText(aText,param,iLastPrintPosition,ELeft,CFont::EHorizontal);

	}

/** Draws text at the specified position and updates the print position.

@param  aText The text string to be drawn

@param aCoords Coordinates to draw the text at. */

EXPORT_C void CFbsBitGc::DrawText(const TDesC& aText,const TPoint& aCoords)

	{

	TTextParameters* param = NULL;

	DrawText(aText,param,aCoords,ELeft,CFont::EHorizontal);

	}

/** Draws text clipped to the specified rectangle.

@param aText The text string to be drawn 

@param aBox The clipping rectangle. */

EXPORT_C void CFbsBitGc::DrawText(const TDesC& aText,const TRect& aBox)

	{

	TTextParameters* param = NULL;

	DrawText(aText,param,aBox);

	}

/** Draws text clipped to the specified rectangle using a baseline offset,

horizontal alignment and a margin.

@param  aText The text string to be drawn

@param aBox The clipping rectangle.

@param  aBLOff An offset in pixels for the baseline from the normal position

        (bottom of the rectangle minus the descent of the font).

@param  aHrz Horizontal alignment option relative to the specified rectangle.

@param aMargin Offset to add to the position as calculated using specified 

		rectangle. */	

EXPORT_C void CFbsBitGc::DrawText(const TDesC& aText,const TRect& aBox,TInt aBLOff,

								  TTextAlign aHrz,TInt aMargin)

    {

    TTextParameters* param = NULL;

	DrawText(aText,param,aBox,aBLOff,-1,aHrz,aMargin);

	}

/** Draws text clipped to the specified rectangle.

@param  aText The text string to be drawn

@param aBox The clipping rectangle. */	

EXPORT_C void CFbsBitGc::DrawText(const TDesC& aText,const TRect& aBox,

								  TInt aBLOff,TInt /*aTextWidth*/,

								  TTextAlign aHrz,TInt aMargin)

    {

// aTextWidth is not used here - try to abolish this - I think it is unneeded

	TPoint p(aBox.iTl);

	p.iY += aBLOff;

	switch (aHrz)

		{

		case ELeft: p.iX += aMargin; break;

		case ERight: p.iX = aBox.iBr.iX - aMargin; break;

		case ECenter: p.iX += aBox.Width() / 2 + aMargin; break;

		}

	TTextParameters* param = NULL;

	DrawText(aText,param,p,aHrz,CFont::EHorizontal,&aBox);

	}

/** The general DrawText routine that implements all the others.

@param aText the text to be drawn

@param aPosition the origin of the text

@param aAlignment left, centred or right, around aPosition; not used if drawing vertically

@param aDirection direction: left to right, right to left, or top to bottom

@param aBox if non-null, filled before the text is drawn

@param aTextBounds if non-null returns the bounding box of the text

*/ 

void CFbsBitGc::DrawText(const TDesC& aText,const TTextParameters* aParam,const TPoint& aPosition,TTextAlign aAlignment,

						 CFont::TTextDirection aDirection,const TRect* aBox)

   {

	// sanity checks

	BG_ASSERT_ALWAYS(iDevice,EBitgdiPanicNoDevicePresent);

	BG_ASSERT_ALWAYS(iFont.Handle() != 0,EBitgdiPanicNoFontSelected);

	const CBitmapFont* bitmap_font = iFont.Address();

	BG_ASSERT_ALWAYS(bitmap_font != 0,EBitgdiPanicNoFontSelected);

	// anything to do?

	if (!aBox && !aText.Length())

		return;

	CFbsDrawDevice* drawDevice = iDevice->iDrawDevice;

	TRect deviceRect;

	drawDevice->GetDrawRect(deviceRect);

	// measure the text

	CFont::TMeasureTextInput measure_text_input;

	measure_text_input.iCharJustNum = iCharJustNum;

	measure_text_input.iCharJustExcess = iCharJustExcess;

	measure_text_input.iWordJustNum = iWordJustNum;

	measure_text_input.iWordJustExcess = iWordJustExcess;

	measure_text_input.iFlags |= CFont::TMeasureTextInput::EFVisualOrder;

	if (aParam)

		{

		BG_ASSERT_ALWAYS(aParam->iStart < aParam->iEnd ,EBitgdiPanicInvalidParameter);

		measure_text_input.iStartInputChar = aParam->iStart;

		measure_text_input.iEndInputChar = Min(aText.Length(),aParam->iEnd);

		}

	CFont::TMeasureTextOutput measure_text_output;

	const int advance = iFont.MeasureText(aText,&measure_text_input,&measure_text_output);

	TRect text_bounds = measure_text_output.iBounds;

	TInt underlineStrikeoutOffset;

	//this call is only needed in the case of linked fonts

	//should this pass by one structure?

	underlineStrikeoutOffset= BaselineCorrection();

	if (iUnderline == EUnderlineOn)

		{

		TInt underline_top = 0, underline_bottom = 0;

		TInt err = GetUnderlineMetrics(underline_top,underline_bottom);

		underline_top+=underlineStrikeoutOffset;

		underline_bottom+=underlineStrikeoutOffset;

		BG_ASSERT_DEBUG(err == KErrNone, EBitgdiPanicInvalidArg);

		text_bounds.iTl.iY = Min(text_bounds.iTl.iY,underline_top);

		text_bounds.iBr.iY = Max(text_bounds.iBr.iY,underline_bottom);

		}

	if (iStrikethrough == EStrikethroughOn)

		{

		TInt strike_top = 0,strike_bottom = 0;

		GetStrikethroughMetrics(strike_top,strike_bottom);

		strike_top+=underlineStrikeoutOffset;

		strike_bottom+=underlineStrikeoutOffset;

		text_bounds.iTl.iY = Min(text_bounds.iTl.iY,strike_top);

		text_bounds.iBr.iY = Max(text_bounds.iBr.iY,strike_bottom);

		}

	if (iUnderline == EUnderlineOn || iStrikethrough == EStrikethroughOn)

		{

		if (aDirection == CFont::EHorizontal)

			{

			text_bounds.iTl.iX = Min(text_bounds.iTl.iX, 0);

			text_bounds.iBr.iX = Max(text_bounds.iBr.iX, advance);

			}

		else

			{

			text_bounds.iTl.iY = Min(text_bounds.iTl.iY, 0);

			text_bounds.iBr.iY = Max(text_bounds.iBr.iY, advance);

			}

		}

	// work out the text origin and new drawing position

 	TPoint text_origin = aPosition;

 	if (aDirection != CFont::EVertical)

 		{

 		const TInt leftSideBearing = Min(text_bounds.iTl.iX, 0);

 		const TInt rightSideBearing = Max(text_bounds.iBr.iX, advance);

 		switch (aAlignment)

 			{

			// We are forbidding side-bearings to leak over the sides here,

			// but still keeping the start and end pen positions within bounds.

			case ELeft:

				text_origin.iX -= leftSideBearing;

				break;

			case ERight:

				text_origin.iX -= rightSideBearing;

				break;

			case ECenter:

				// Centre is the average of left and right

				text_origin.iX -= (leftSideBearing + rightSideBearing) >> 1;

				break;

			default:

				break;

 			}

		}

	iLastPrintPosition = text_origin;

	if (aDirection == CFont::EHorizontal)

		iLastPrintPosition.iX += advance;

	else

		iLastPrintPosition.iY += advance;

	text_origin.iY += bitmap_font->iAlgStyle.iBaselineOffsetInPixels;

	text_bounds.Move(text_origin);

	text_origin += iOrigin;

	// determine clipping rectangle

	TRect clip_rect = aBox ? *aBox : text_bounds;

	AddRect(clip_rect);

	clip_rect.Move(iOrigin);

	if (UserClipRect(clip_rect))

		{

		if (iAutoUpdateJustification)

			UpdateJustification(aText,aParam);

		return; // nothing to do

		}

	SetupDevice();

	iDevice->DrawingBegin(&iBrushBitmap);

	CFbsRasterizer* brushRasterizer = PrepareRasterizerForExtendedBitmap(iBrushBitmap);

	// fill the box if necessary

	if (aBox)

		{

		TRect fill_box = *aBox;

		fill_box.Move(iOrigin);

		RectFill(fill_box);

		}

	// decide which drawing routine to call

	const TBool bold = bitmap_font->iAlgStyle.IsBold();

	const TBool italic = bitmap_font->iAlgStyle.IsItalic();

	const TBool multiw = bitmap_font->iAlgStyle.WidthFactor() > 1;

	const TBool multih = bitmap_font->iAlgStyle.HeightFactor() > 1;

	TOpenFontMetrics metrics;

	iFont.GetFontMetrics(metrics);

	const TInt maxwidth = metrics.MaxWidth();

	// extext will be TRUE, if font is bold/italic/underline/strikethrough/anti-aliased or it 

	// has shadow/outline effects ON. Depending on these properties it will call the proper draw routine.

	TBool extext = FALSE;

	TBool normaltext = FALSE;

	const TBool anti_aliased = (bitmap_font->GlyphBitmapType() == EAntiAliasedGlyphBitmap);

	const TBool outlineAndShadow = (bitmap_font->GlyphBitmapType() == EFourColourBlendGlyphBitmap);

	if (anti_aliased || outlineAndShadow)

		{

		if ((outlineAndShadow) && !(iBrushStyle == ENullBrush || iBrushStyle == ESolidBrush))

			{

			//For future compatibility it is better if brush style of ENullBrush or ESolidBrush is used 

			//when drawing outline and shadow fonts.

			BG_PANIC_ALWAYS(EBitgdiPanicInvalidBrushStyle);

			}

		extext = TRUE;

		}

	else if (maxwidth > 30 || text_bounds.Height() > 32 || multiw || multih)

		{

		}

	else if (iUnderline == EUnderlineOn || bold || italic || iStrikethrough == EStrikethroughOn || 

			 iCharJustNum > 0 || iWordJustNum > 0)

		extext = TRUE;

	else

		normaltext = TRUE;

	const TInt charjustexcess = iCharJustExcess;

	const TInt charjustnum = iCharJustNum;

	const TInt wordjustexcess = iWordJustExcess;

	const TInt wordjustnum = iWordJustNum;

	// draw the text to all clip rectangles in turn

	int clip_rects = iDefaultRegionPtr->Count();

	for (int i = 0; i < clip_rects; i++)

		{

		iClipRect = (*iDefaultRegionPtr)[i];

		if (!iClipRect.Intersects(clip_rect))

			continue;

#ifdef _DEBUG

		BG_ASSERT_DEBUG(iClipRect.iTl.iX >= deviceRect.iTl.iX, EBitgdiPanicOutOfBounds);

		BG_ASSERT_DEBUG(iClipRect.iTl.iY >= deviceRect.iTl.iY, EBitgdiPanicOutOfBounds);

		BG_ASSERT_DEBUG(iClipRect.iBr.iX <= deviceRect.iBr.iX, EBitgdiPanicOutOfBounds);

		BG_ASSERT_DEBUG(iClipRect.iBr.iY <= deviceRect.iBr.iY, EBitgdiPanicOutOfBounds);

#endif

		iClipRect.Intersection(clip_rect);

		// Set up the parameter block for character positioning.

		CFont::TPositionParam param;

		param.iDirection = static_cast<TInt16>(aDirection);

		param.iText.Set(aText);

		TInt endDraw = aText.Length();

		if (aParam)

			{

			param.iPosInText = aParam->iStart;

			endDraw = Min(aText.Length(),aParam->iEnd);

			}

		else

			param.iPosInText = 0;

		param.iPen = text_origin;

		// Draw the text.

		if (normaltext)

			DoDrawText(param,endDraw);

		else if (extext)

			DoDrawTextEx(param,bitmap_font,endDraw,underlineStrikeoutOffset);

		else

			DoDrawTextLarge(param,bitmap_font,endDraw);

		/*

		Reset the justification parameters to their original values.

		These will be updated as required later in code.

		*/

		iCharJustExcess = charjustexcess;

		iCharJustNum = charjustnum;

		iWordJustExcess = wordjustexcess;

		iWordJustNum = wordjustnum;

		drawDevice->UpdateRegion(iClipRect);

		}

	if (brushRasterizer)

		{

		brushRasterizer->EndBitmap(iBrushBitmap.SerialNumber());

		}

	iDevice->DrawingEnd(&iBrushBitmap);

	if (iAutoUpdateJustification)

		UpdateJustification(aText,aParam);

	}

void CFbsBitGc::DoDrawText(CFont::TPositionParam& aParam, const TInt aEnd)

	{

	//const int n = aParam.iText.Length();

	RShapeInfo shapeInfo;

	while (aParam.iPosInText < /*n*/aEnd)

		{

		if (iFont.GetCharacterPosition2(aParam, shapeInfo))

			{

			const CFont::TPositionParam::TOutput* output = aParam.iOutput;

			for (int i = 0; i < aParam.iOutputGlyphs; i++, output++)

				DoDrawCharacter(output->iBounds.iTl,output->iBitmapSize,output->iBitmap);

			}

		}

	if (shapeInfo.IsOpen())

		shapeInfo.Close();

	}

void CFbsBitGc::DoDrawCharacter(const TPoint& aTopLeft,

								const TSize& aDataSize,

								const TUint8* aData)

	{

	/*

	Divert if the character is larger than expected; the criterion

	for choosing this function is only a heuristic, because it's perfectly legal for

	a character's bitmap to be wider than its escapement.

	Use a dummy value (0) for semi-ascent because this character is not italic and so semi-ascent

	is irrelevant; it's used for pseudo-italic slanting.

	*/

	TInt dataheight = aDataSize.iHeight;

	TInt datalength = aDataSize.iWidth;

	if (datalength > 30 || dataheight > 32)

		{

		DoDrawCharacterExLarge(aTopLeft,aDataSize,aData,FALSE,FALSE,0,1,1);

		return;

		}

	TInt bitindex=0;

	TInt16 repeatcount=0;

	TUint32 binarydata[32];

	TUint32* binarydataptr=binarydata;

	TUint32* binarydataptrlimit;

	for(TInt charline=0;charline<dataheight;charline+=repeatcount) // for lines in the character...

		{

		repeatcount=Load16(aData+(bitindex>>3));

		repeatcount>>=bitindex&7;

		TInt multilineflag=repeatcount&1;

		repeatcount>>=1;

		repeatcount&=0xf;

		bitindex+=5;

		binarydataptrlimit=binarydata+charline+repeatcount;

		if(multilineflag)

			{

			while(binarydataptr<binarydataptrlimit)

				{

				TInt chardataoffsetptr=TInt(aData)+(bitindex>>3);

				TUint32* chardataword=(TUint32*)(chardataoffsetptr&~3);

				TInt bitshift=bitindex&7;

				bitshift+=(chardataoffsetptr&3)<<3;

				*binarydataptr=(*chardataword++)>>bitshift;

				if(bitshift) *binarydataptr|=(*chardataword<<(32-bitshift));

				bitindex+=datalength;

				binarydataptr++;

				}

			}

		else

			{

			TInt chardataoffsetptr=TInt(aData)+(bitindex>>3);

			TUint32* chardataword=(TUint32*)(chardataoffsetptr&~3);

			TInt bitshift=bitindex&7;

			bitshift+=(chardataoffsetptr&3)<<3;

			TUint32 data=(*chardataword++)>>bitshift;

			if(bitshift) data|=(*chardataword<<(32-bitshift));

			while(binarydataptr<binarydataptrlimit)

				*binarydataptr++=data;

			bitindex+=datalength;

			}

		}

	TPoint topleft(aTopLeft);

	binarydataptr=ClipBinaryArray(binarydata,binarydata+dataheight,1,datalength,dataheight,topleft);

	if(datalength>0 && dataheight>0)

		iDevice->iDrawDevice->WriteBinary(topleft.iX,topleft.iY,binarydataptr,datalength,dataheight,iPenColor,iDrawMode);

	}

/** 

@internalTechnology

This function retrieves the baseline offset from the metrics of the text currently being drawn.

This is used to alter the positioning of underline and strikethrough on a linked font

@return The baseline correction associated with the currently used font.

*/	

TInt CFbsBitGc::BaselineCorrection()

	{

	TOpenFontMetrics metrics;

	if (iFont.GetFontMetrics(metrics))

		return metrics.BaselineCorrection();

	else

		return 0;

	}

void CFbsBitGc::DoDrawTextEx(CFont::TPositionParam& aParam,const CBitmapFont* font, const TInt aEnd, const TInt aUnderlineStrikethroughOffset)

	{

	const TInt charclipping = iClipRect.iBr.iX;

	TPoint start_pen = aParam.iPen;

	const TBool bold = font->iAlgStyle.IsBold();

	const TBool italic = font->iAlgStyle.IsItalic();

	const TGlyphBitmapType glyphBitmapTypeForFont = font->GlyphBitmapType();

	const TBool outlineShadowOrAntialiased = ((glyphBitmapTypeForFont == EAntiAliasedGlyphBitmap) ||

												(glyphBitmapTypeForFont == EFourColourBlendGlyphBitmap));

	TInt underline_top = 0, underline_bottom = 0;

	if (iUnderline == EUnderlineOn)

		{

		TInt err = GetUnderlineMetrics(underline_top,underline_bottom);

		underline_top+=aUnderlineStrikethroughOffset;

		underline_bottom+=aUnderlineStrikethroughOffset;

		BG_ASSERT_DEBUG(err == KErrNone, EBitgdiPanicInvalidArg);

		}

	TInt strike_top = 0, strike_bottom = 0;

	if (italic || iStrikethrough == EStrikethroughOn)

		{

		GetStrikethroughMetrics(strike_top,strike_bottom);

		strike_top+=aUnderlineStrikethroughOffset;

		strike_bottom+=aUnderlineStrikethroughOffset;

		}

	CFbsDrawDevice* drawDevice = iDevice->iDrawDevice;

	RShapeInfo shapeInfo;

	while (aParam.iPosInText < aEnd)

		{

		if (!iFont.GetCharacterPosition2(aParam, shapeInfo))

			continue;

		TInt adjustment = 0;

		if(iCharJustExcess && iCharJustNum > 0) // character clipping/justification

			{

			adjustment = CGraphicsContext::JustificationInPixels(iCharJustExcess,iCharJustNum);

			if(adjustment < 0)

				iClipRect.iBr.iX = Min(aParam.iPen.iX + adjustment,iClipRect.iBr.iX);

			}

		const CFont::TPositionParam::TOutput* output = aParam.iOutput;

		int semi_ascent = start_pen.iY + strike_top;

		for (int i = 0; i < aParam.iOutputGlyphs; i++, output++)

			{

			//get the character metrics for the glyph type

			TOpenFontCharMetrics characterParams;

			const TUint8* bitmap;

			TSize size;

			//note may now be using a glyph code, and not a character

			iFont.GetCharacterData(aParam.iOutput[i].iCode,characterParams,bitmap,size);

			TGlyphBitmapType glyphType = characterParams.GlyphType();

			switch (glyphType)

				{

				case EAntiAliasedGlyphBitmap:

				case EFourColourBlendGlyphBitmap:

					DoDrawCharacterAntiAliased(output->iBounds.iTl,output->iBitmapSize,output->iBitmap,glyphType);

					break;

				case EDefaultGlyphBitmap:

				case EMonochromeGlyphBitmap:

					DoDrawCharacterEx(output->iBounds.iTl,output->iBitmapSize,output->iBitmap,bold,italic,semi_ascent);

					break;

				default:

					//if the outline or shadow is not specified for the character, then use the font setting

					if (outlineShadowOrAntialiased)

						{

						DoDrawCharacterAntiAliased(output->iBounds.iTl,output->iBitmapSize,output->iBitmap,glyphBitmapTypeForFont);			

						}

					else

						{

						DoDrawCharacterEx(output->iBounds.iTl,output->iBitmapSize,output->iBitmap,bold,italic,semi_ascent);

						}			 

					break;

				}

			}

		iClipRect.iBr.iX = charclipping;

		if (adjustment)

			aParam.iPen.iX += adjustment;

		if (iWordJustExcess > 0 && iWordJustNum > 0 && aParam.iOutput[0].iCode == 0x0020) // word justification

			{

			adjustment = CGraphicsContext::JustificationInPixels(iWordJustExcess,iWordJustNum);

			aParam.iPen.iX += adjustment;

			}

		}

	if (shapeInfo.IsOpen())