//	PixelMap.cxx

#include "PixelMap.h"

PixelMap::PixelMap( const int pWidth, const int pHeight, const int pColors )
: itsPalette(pColors < 256 ? pColors : 256)
{
	// for now, allow no more than 256 colors!
	
	itsWidth = pWidth;
	itsHeight = pHeight;
	
	itsQtyColors = pColors;
	itsColorBits = 16;		// standard 16-bit color
		
	itsBuffer = new unsigned char[pWidth*pHeight];
	
	if (!itsBuffer) itsHeight = itsWidth = 0;
	
	FillBox( 0,itsWidth, 0,itsHeight, 0);		// initialize it!
}

int PixelMap::SetPixel( const int pX, const int pY, const int pColor )
{
	if (IsGood(pX,pY)) {
		itsBuffer[pX+pY*itsWidth] =
				(pColor < itsPalette.itsSize ? pColor : itsPalette.itsSize-1 );
		return 1;
	}
	return 0;
}

void PixelMap::FillBox( const int pX1, const int pX2, const int pY1, const int pY2,
					const int pColor )
{
	int x1 = (pX1 > 0 ? pX1 : 0);
	int x2 = (pX2 < itsWidth ? pX2 : itsWidth);
	int y1 = (pY1 > 0 ? pY1 : 0);
	int y2 = (pY2 < itsHeight ? pY2 : itsHeight);
	
	for (int i=x1; i<x2; i++)
		for (int j=y1; j<y2; j++)
			SetPixel( i,j, pColor );
}