chasctxt.cpp

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/*----------------------------------------------------------------------------
                        _                              _ _       
        /\             | |                            | (_)      
       /  \   _ __   __| |_ __ ___  _ __ ___   ___  __| |_  __ _ 
      / /\ \ | '_ \ / _` | '__/ _ \| '_ ` _ \ / _ \/ _` | |/ _` |
     / ____ \| | | | (_| | | | (_) | | | | | |  __/ (_| | | (_| |
    /_/    \_\_| |_|\__,_|_|  \___/|_| |_| |_|\___|\__,_|_|\__,_|

    The contents of this file are subject to the Andromedia Public
	License Version 1.0 (the "License"); you may not use this file
	except in compliance with the License. You may obtain a copy of
	the License at http://www.andromedia.com/APL/

    Software distributed under the License is distributed on an
	"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
	implied. See the License for the specific language governing
	rights and limitations under the License.

    The Original Code is Pueblo client code, released November 4, 1998.

    The Initial Developer of the Original Code is Andromedia Incorporated.
	Portions created by Andromedia are Copyright (C) 1998 Andromedia
	Incorporated.  All Rights Reserved.

	Andromedia Incorporated                         415.365.6700
	818 Mission Street - 2nd Floor                  415.365.6701 fax
	San Francisco, CA 94103

    Contributor(s):
	--------------------------------------------------------------------------
	   Chaco team:  Dan Greening, Glenn Crocker, Jim Doubek,
	                Coyote Lussier, Pritham Shetty.

					Wrote and designed original codebase.

------------------------------------------------------------------------------

	Implementation for the ChQvAsciiText class for  Intel 3DR.

----------------------------------------------------------------------------*/

// $Header: /home/cvs/chaco/modules/client/msw/ChGraphx/ChAscTxt.cpp,v 2.19 1996/06/27 03:42:57 jimd Exp $

#include "grheader.h"

#include "CvInstnc.h"
#include <QvInfo.h>
#include <QvState.h>
#include "ChMaze.h"
#include "ChMazDep.h"
#include "CvTrnsfm.h"
#include "CvNormal.h"
#include "CvBound.h"
#include "CvMaterl.h"
#include "CvTextur.h"
#include "ChGrFont.h"

#define USE_TEXTURE_TEXT	1

/*
From the VRML 1.0 Spec
Also see: 
http://vrml.wired.com/vrml.tech/vrml10-3.html

AsciiText

This node represents strings of text characters from the ASCII coded character set. The first
string is rendered with its baseline at (0,0,0). All subsequent strings advance y by -(size *
spacing). See FontStyle for a description of the size field. The justification field determines
the placement of the strings in the x dimension. LEFT (the default) places the left edge of each
string at x=0. CENTER places the center of each string at x=0. RIGHT places the right edge of
each string at x=0. Text is rendered from left to right, top to bottom in the font set by FontStyle.
The width field defines a suggested width constraint for each string. The default is to use the
natural width of each string. Setting any value to 0 indicates the natural width should be used for
that string. 

The text is transformed by the current cumulative transformation and is drawn with the current
material and texture. 

Textures are applied to 3D text as follows. The texture origin is at the origin of the first string, as
determined by the justification. The texture is scaled equally in both S and T dimensions, with
the font height representing 1 unit. S increases to the right. The T origin can occur anywhere
along each character, depending on how that character's outline is defined. 



JUSTIFICATION

     LEFT     Align left edge of text to origin

     CENTER   Align center of text to origin

     RIGHT    Align right edge of text to origin


FILE FORMAT/DEFAULTS

     AsciiText {

          string         ""    # MFString

          spacing        1     # SFFloat

          justification  LEFT  # SFEnum

          width          0     # MFFloat

     }


*/

/* Helper class for cache */

class ChAsciiCharCache
{
	friend class ChQvAsciiTextInstance;

	protected:
		ChPolyPolygonGx3 *m_pPoly;
		unsigned int m_letter;
		float m_xAdvance, m_yAdvance;
 

	public:
		ChAsciiCharCache(ChPolyPolygonGx3 *pPoly, unsigned int letter, float	xAdvance, float yAdvance)
		{
			m_pPoly = pPoly;
			m_letter = letter;
			m_xAdvance = xAdvance;
			m_yAdvance = yAdvance;
		};
		~ChAsciiCharCache()
		{
			delete m_pPoly;
		};
};

ChQvAsciiTextInstance::ChQvAsciiTextInstance() : ChQvShapeInstance(), m_pCache(0)
{
}

ChQvAsciiTextInstance::~ChQvAsciiTextInstance()
{
	if(m_pCache)
	{
		while(!m_pCache->IsEmpty())
		{
			ChAsciiCharCache *pCharCache = m_pCache->RemoveHead();
			delete pCharCache;
		}
		delete m_pCache;
		m_pCache = 0;
	}
}



float ChQvAsciiTextInstance::GetTextWidth(HFONT hFont, int index)
{
	// return specified length if ! 0, else  string length in units
	QvAsciiText *pNode = (QvAsciiText *)m_pNode;
	#if (defined(CH_USE_RLAB) || defined(CH_USE_D3D))
	// fixed width not implemented yet for 3dr
	if(pNode->width.num > index && pNode->width.values[index] > 0.0) 
	{						     // treat negative like zero
		return pNode->width.values[index];
	}
	else
	#endif
	{
		char *str = (char*)(pNode->string.values[index].getString());
		return GetTextWidth( hFont, str );
	}
}

float ChQvAsciiTextInstance::GetTextWidth(HFONT hFont,  char * text)
{
	HDC hdc = ::GetDC(NULL);
	HFONT oldFont = HFONT(::SelectObject(hdc, hFont));

	SIZE size;
	if ( !GetTextExtentPoint32(hdc, text, strlen(text), &size) )
	{  // function will fail under Win32s, use	 GetTextExtentPoint
	  	GetTextExtentPoint(hdc, text, strlen(text), &size);
	}

	::SelectObject(hdc, oldFont);
	ReleaseDC(NULL, hdc);

	if(0 == size.cy) size.cy = 1;
	return size.cx * GetFontStyle()->size.value / size.cy; // 
}

float ChQvAsciiTextInstance::GetBaselineOffset()
{
	//return the baseline offset from TL corner for the current font
	// Remember that 1.0 * spacing is -total- font height, including all spacing
	QvAsciiText *pNode = (QvAsciiText *)m_pNode;
	return (-.75 * pNode->spacing.value * GetFontStyle()->size.value);	// bogus computation :: TODO - make accurate
}

float ChQvAsciiTextInstance::GetTextHeight()
{
	QvAsciiText *pNode = (QvAsciiText *)m_pNode;
	return pNode->spacing.value * pNode->string.num * GetFontStyle()->size.value;
}

float ChQvAsciiTextInstance::GetFontLODHeight(ChRenderContext *pRC)
{
	float height;

	ChQvBounds charBounds;
	GxVec3f lower, upper, center(0.,0.,0);
	const float MAX_FONT_HEIGHT = 50;
										// arbitrary value - determines best possible appearance
	const float aMatterOfTaste = 2;		// smaller is higher quality

	lower.set(0., 0., 0.);
	upper.set(GetFontStyle()->size.value * .5, GetFontStyle()->size.value, 0.);
	charBounds.SetBounds(lower, upper);
 	charBounds.SetCenter(center);
	charBounds.SetTransform(GetTransform());

	ChRect extent = GetBoundsExtent(pRC, &charBounds);

	int maxExtent = max(extent.bottom - extent.top, extent.right - extent.left);

	height = maxExtent / aMatterOfTaste;	
	float quality = pRC->GetQuality();
	height *= quality;

	height = max(height, 2.0);
	height = min(height, MAX_FONT_HEIGHT);
	return height;
}

bool ChQvAsciiTextInstance::Construct(ChRenderContext *pRC, ChConstructionIterator *pIterator)
{
#if (defined(CH_USE_RLAB) || defined(CH_USE_D3D))
	{
		ASSERT(m_frame );
		pRC->LockQv();		   // Lock tree so other threads don't kill our data
		if(!pIterator->IsOKToProceed(this))	 // This locks scene if available
		{
			pRC->UnlockQv();		   // Unlock tree 
			return 0;
		}
		if(IsConstructed())
		{
			pRC->UnlockScene();
			pRC->UnlockQv();		   // Unlock tree 
			return 1;
		}
		m_boolConstructed = true;
		
		
 		QvAsciiText *pNode = (QvAsciiText *)GetNode();

		ChNrMesh mesh = m_mesh = pRC->CreateMesh();
		ChNrFrameAddVisual(GetFrame(), mesh);
		D3DRelease(mesh);

		ChNrObjectSetAppData(mesh, (unsigned long)this);
		ChNrMeshSetPerspective(mesh,true);  
		ChNrMeshSetColorSource(mesh,ColorFromFace); 

				// flag to say something got put in here
		bool boolFilled = false;
		HFONT hFont;

		#if defined(USE_TEXTURE_TEXT)
		{
			// Use Textured text
			const int minimumAscent = 20;  // Before applying quality

			ChQvAsciiTextMaterials materialMap( this);
			pRC->AdjustTransparency(materialMap);
			ChMaterial mat = materialMap.GetMat(0);
			ChColor color = mat.GetBase();

			// Create the text dib - monochrome
			int quality = ((ChMazeWnd*)(pRC->GetWnd()))->GetSettings()->GetAsciiTextQuality();
			quality = peg(quality, 0, 2);

			float xEnlargement = 1 << quality, yEnlargement = 1 << quality;		// Blow up to get rid of jaggies
			int minAscent = minimumAscent * 1 << quality;
			float fontSize = GetFontStyle()->size.value;
			int iAscent = yEnlargement * fontSize;
			while(iAscent < minAscent)
			{
				xEnlargement++;	 yEnlargement++;
				iAscent = yEnlargement * fontSize;
			}

			hFont = CreateFont(iAscent);

		  	float xChar = 0, yChar = 0; 	  // current character position

			int fLeft = 0, fRight = 0, fTotalWidth = 0;
			for(int line = 0; line < pNode->string.num; line++)
			{
				float width = GetTextWidth(hFont, line) * xEnlargement;

				float x;
				switch(pNode->justification.value)
				{
					case QvAsciiText::LEFT:
						x = 0.;	
						break;
					case QvAsciiText::RIGHT:
						x = -width;
						break;
					case QvAsciiText::CENTER:
						x = -((width + 1) / 2);
						break;
				}
				fLeft = min(fLeft, x);
				fRight = max(fRight, x + width);
			}
			fTotalWidth = fRight - fLeft;

			int	iBmpWidth = int(fTotalWidth); 
			int	iBmpHeight = GetTextHeight() * yEnlargement;

			int w = 1, h = 1;

			while(w < iBmpWidth) w = w << 1;
			float xFactor =	float(w) / iBmpWidth;
			xEnlargement *= xFactor;
			iBmpWidth = w;

			while(h < iBmpHeight) h = h << 1;
			float yFactor =	float(h) / iBmpHeight;
			yEnlargement *= yFactor;
			iBmpHeight = h;

			fLeft *= xFactor;
			fRight *= xFactor;
			fTotalWidth *= xFactor;		  // Roughly

			float aspect = yFactor > .01 ? xFactor / yFactor : 1;

			DeleteObject(hFont);
			iAscent = yEnlargement * fontSize;
			hFont = CreateFont(iAscent, aspect);

			CDC dc;
			CBitmap bmp;
			bmp.CreateBitmap(iBmpWidth, iBmpHeight, 1, 1, 0);
			dc.CreateCompatibleDC(0);
			CBitmap *pOldBmp = dc.SelectObject(&bmp);
			CFont *pFont = CFont::FromHandle(hFont); 
			CFont *pOldFont = dc.SelectObject(pFont);

			RECT r = {0, 0, iBmpWidth, iBmpHeight};
			CBrush brush;
			brush.CreateStockObject(BLACK_BRUSH);
			dc.FillRect(&r, &brush); 
			dc.SetTextColor( RGB(0xff, 0xff, 0xff));
			dc.SetBkColor( RGB(0x0, 0x0, 0x0));
			dc.SetTextAlign( TA_TOP | TA_LEFT );

			int charWidths[256];
			dc.GetOutputCharWidth( 0, 255, charWidths );

			for(line = 0; line < pNode->string.num; line++)
			{
													// 'string' field is really QvMFString
				string text = pNode->string.values[line].getString();

				int numChars = text.GetLength();

				float width = GetTextWidth(hFont, line) * xEnlargement;
				if(!(pNode->width.num > line && pNode->width.values[line] > 0.0) )
				{
					width  /= aspect;	// very roughly
				}

				GxVec3f p;
				switch(pNode->justification.value)
				{
					case QvAsciiText::LEFT:
						 p.x() = 0.;	
						break;
					case QvAsciiText::RIGHT:
						p.x() = -width;
						break;
					case QvAsciiText::CENTER:
						p.x() = -width / 2;
						break;
				}
				p.y() = /*-GetBaselineOffset()*/ + line * pNode->spacing.value * fontSize;	// chars ought be on baseline 
				p.z() = 0;

				p.x() -= fLeft;
				p.y() *= yEnlargement;
				CSize cs = dc.GetOutputTextExtent( text, text.GetLength() );
				
				int * pWidths = 0;
				int widthWanted;
				if(pNode->width.num > line && pNode->width.values[line] > 0.0)
				{	
					 widthWanted =  int(pNode->width.values[line] * xEnlargement + .5);
				}
				else
				{
					 widthWanted =  iBmpWidth;
				} 
				pWidths = new int[numChars];
				int sum = 0;
				for(int ich = 0; ich < numChars; ich++)
				{
				 	pWidths[ich] = charWidths[text[ich]];
					sum += pWidths[ich];
				}

				float factor = float(widthWanted) / sum;	// how much to expand or contract the string

				if(pNode->width.num > line && pNode->width.values[line] > 0.0 || factor < 1.0)
				{
					int actual = 0;
					sum = 0;
					for(ich = 0; ich < numChars; ich++)
					{
						sum += pWidths[ich];
						int desired = int(factor * sum);
						pWidths[ich] = desired - actual;
						actual += pWidths[ich];
					}
				}
					//int nCharExtra = (float(widthWanted - cs.cx)) / (text.GetLength() - 1) + .5;
					//dc.SetTextCharacterExtra( nCharExtra );
				dc.ExtTextOut(int(p.x()), int(p.y()), 0, 0, text, text.GetLength(), pWidths);
				delete [] pWidths;
			}

			dc.SelectObject(pOldBmp);
			dc.SelectObject(pOldFont);

			//ChColor color(1., 0., 0.);
			#if (defined(CH_USE_RLAB))
			ChTexture *pTxt = new ChTexture(pRC, color, bmp);
			#else
			ChColor chromaKey((~(*(color.GetNative()))) && 0xffffff);
			ChTexture *pTxt = new ChTexture(pRC, color, bmp, &chromaKey);
			#endif
		
			GxVec3f verts[4], normals[2];
			verts[0].set(fLeft / xEnlargement, pNode->spacing.value * fontSize, 0);
			verts[1].set(fRight / xEnlargement, pNode->spacing.value * fontSize, 0);
			verts[2].set(fRight / xEnlargement, pNode->spacing.value * fontSize - GetTextHeight(), 0);
			verts[3].set(fLeft / xEnlargement, pNode->spacing.value * fontSize - GetTextHeight(), 0);

			// we need both front and back
			normals[0].set(0, 0, 1);
			normals[1].set(0, 0, -1);

			ChNrFaceData face_data[4 * 2 * 2 + 2 + 1];
			int ifd = 0;
			ChNrFaceArray facesAdded;
			int numFacesAdded;

			face_data[ifd++]	=	4;
			face_data[ifd++]	=	0;
			face_data[ifd++]	=	0;
			face_data[ifd++]	=	1;
			face_data[ifd++]	=	0;
			face_data[ifd++]	=	2;
			face_data[ifd++]	=	0;
			face_data[ifd++]	=	3;
			face_data[ifd++]	=	0;

			face_data[ifd++]	=	4;
			face_data[ifd++]	=	0;
			face_data[ifd++]	=	1;
			face_data[ifd++]	=	3;
			face_data[ifd++]	=	1;
			face_data[ifd++]	=	2;
			face_data[ifd++]	=	1;
			face_data[ifd++]	=	1;
			face_data[ifd++]	=	1;

			face_data[ifd++]	=	0;

			ChNrMeshAddFaces(	m_mesh, 
							4, 
							(ChNrVector*)verts, 
							2, 
							(ChNrVector*)normals, 
							face_data, 
							&numFacesAdded,
							&facesAdded);
		
			#if defined(CH_USE_D3D)
			numFacesAdded = facesAdded->GetSize();
			#endif